/**
 * style.css - ArrayMaster Design System
 * Modern Dark Tech Slate with Neon Accents & Glassmorphism
 */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root {
  /* Color Tokens */
  --bg-base: #0a0d14;
  --bg-surface: #111726;
  --bg-surface-elevated: #182033;
  --bg-card: rgba(22, 30, 49, 0.75);
  --bg-code: #0b0f19;
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-active: rgba(56, 189, 248, 0.4);
  --border-glow: rgba(99, 102, 241, 0.25);

  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;

  --accent-cyan: #38bdf8;
  --accent-indigo: #6366f1;
  --accent-purple: #a855f7;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;

  --font-main: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 25px rgba(56, 189, 248, 0.15);
  --shadow-indigo-glow: 0 0 25px rgba(99, 102, 241, 0.2);
}

/* Light Theme Variables */
body.light-theme {
  --bg-base: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-elevated: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.95);
  --bg-code: #0f172a;
  
  --border-subtle: #e2e8f0;
  --border-active: #0284c7;
  --border-glow: rgba(2, 132, 199, 0.2);

  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #64748b;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.05) 0%, transparent 40%),
    radial-gradient(circle at 85% 65%, rgba(56, 189, 248, 0.05) 0%, transparent 45%);
}

/* Reset & Global */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-base);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 65%, rgba(56, 189, 248, 0.08) 0%, transparent 45%);
}

/* Navigation Navbar */
.top-navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 2rem;
  background: rgba(17, 23, 38, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-subtle);
}

.brand-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-indigo));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.25rem;
  color: #fff;
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #fff 40%, var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.brand-text-block {
  display: flex;
  flex-direction: column;
}

.brand-author {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent-cyan);
  letter-spacing: 0.02em;
  line-height: 1.1;
  margin-top: 1px;
}

body.light-theme .brand-author {
  color: var(--accent-indigo);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Progress in Navbar */
.header-progress-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  min-width: 220px;
}

.header-progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.progress-track {
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 99px;
  overflow: hidden;
}

.progress-bar-glow {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cyan), var(--accent-emerald));
  border-radius: 99px;
  transition: width 0.4s ease;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.5);
}

/* Main Layout: Sidebar & Content */
.main-layout {
  display: flex;
  flex: 1;
  max-width: 1600px;
  margin: 0 auto;
  width: 100%;
}

/* Sidebar */
.curriculum-sidebar {
  width: 320px;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  padding: 1.5rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  overflow-y: auto;
  height: calc(100vh - 65px);
  position: sticky;
  top: 65px;
}

.sidebar-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 0.5rem;
}

.sidebar-heading {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

.curriculum-nav {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.25s ease;
  background: transparent;
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.03);
  border-color: rgba(255, 255, 255, 0.05);
}

.nav-item.active {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.12), rgba(99, 102, 241, 0.12));
  border-color: var(--border-active);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.nav-item.completed:not(.active) {
  border-left: 3px solid var(--accent-emerald);
}

.nav-item-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.nav-item-info {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.nav-item-badge {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.nav-item-title {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-main);
  line-height: 1.3;
}

/* Content Area */
.content-viewport {
  flex: 1;
  padding: 2.5rem 3rem;
  max-width: 1080px;
  margin: 0 auto;
}

/* Module Header Hero */
.module-header-hero {
  margin-bottom: 2.5rem;
}

.module-tags {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.85rem;
  border-radius: 99px;
  font-size: 0.78rem;
  font-weight: 700;
}

.badge-primary {
  background: rgba(56, 189, 248, 0.15);
  color: var(--accent-cyan);
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.badge-muted {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-muted);
}

.badge-success {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-level {
  background: rgba(168, 85, 247, 0.15);
  color: var(--accent-purple);
  border: 1px solid rgba(168, 85, 247, 0.3);
}

.badge-category {
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-indigo);
  border: 1px solid rgba(99, 102, 241, 0.3);
}

.module-main-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 0.65rem;
  background: linear-gradient(135deg, #ffffff 60%, var(--text-muted));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.module-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.module-summary-card {
  display: flex;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-md);
  align-items: center;
}

.summary-icon {
  font-size: 1.5rem;
  flex-shrink: 0;
}

.summary-text {
  font-size: 0.95rem;
  color: #cbd5e1;
}

/* Sections Styling */
.sections-container {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

.module-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.section-heading {
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #fff;
  border-left: 4px solid var(--accent-cyan);
  padding-left: 0.85rem;
}

.section-body {
  font-size: 1.02rem;
  color: #cbd5e1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.section-body p {
  line-height: 1.7;
}

.section-body ul, .section-body ol {
  padding-left: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* Inline code in text */
.section-body :not(pre) > code {
  font-family: var(--font-mono);
  background: rgba(255, 255, 255, 0.08);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--accent-cyan);
}

/* Alert Boxes */
.alert-box {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-md);
  margin: 0.5rem 0;
}

.alert-box.tip {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: #a7f3d0;
}

.alert-box.note {
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: #bae6fd;
}

.alert-box .icon {
  font-size: 1.4rem;
  flex-shrink: 0;
}

/* Code Previews in Content */
.code-preview {
  position: relative;
  background: #0b0f19;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  margin: 1rem 0;
}

body.light-theme .code-preview {
  background: #0f172a;
  border-color: #cbd5e1;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
}

.code-preview pre {
  margin: 0 !important;
  padding: 0 !important;
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
}

.code-preview pre code,
.code-preview code,
.code-preview .lang-code-block {
  display: block;
  font-family: var(--font-mono) !important;
  font-size: 0.92rem !important;
  color: #38bdf8 !important;
  line-height: 1.65 !important;
  background: transparent !important;
  padding: 0 !important;
  border-radius: 0 !important;
  border: none !important;
  box-shadow: none !important;
  white-space: pre;
}

body.light-theme .code-preview pre code,
body.light-theme .code-preview code,
body.light-theme .code-preview .lang-code-block {
  background: transparent !important;
  color: #38bdf8 !important;
  padding: 0 !important;
  border-radius: 0 !important;
  border: none !important;
  box-shadow: none !important;
}

/* Visual Memory Card */
.visual-memory-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 1rem 0;
}

.memory-row {
  display: flex;
  gap: 0.85rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.mem-item {
  display: flex;
  flex-direction: column;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1.25rem;
  text-align: center;
  min-width: 110px;
}

.mem-item .idx {
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--accent-cyan);
  margin-bottom: 0.25rem;
}

.mem-item .val {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
}

.mem-caption {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: 0.75rem;
}

/* Modern Tables */
.table-responsive {
  overflow-x: auto;
  margin: 1rem 0;
}

.modern-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.modern-table th, .modern-table td {
  padding: 0.85rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.modern-table th {
  background: var(--bg-surface);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.modern-table td {
  font-size: 0.92rem;
  color: #cbd5e1;
}

/* Stepper Box */
.stepper-box {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.step-line {
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.02);
  border-left: 3px solid var(--accent-indigo);
  font-size: 0.9rem;
}

.step-line.done {
  border-left-color: var(--accent-emerald);
  color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.05);
}

/* VISUALIZER PANELS */
.visualizer-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-bottom: 2.5rem;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.vis-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.vis-title h4 {
  font-size: 1.35rem;
  font-weight: 700;
  color: #fff;
  margin-top: 0.35rem;
}

.badge-tag {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-cyan);
}

.vis-stats {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.stat-pill {
  padding: 0.4rem 0.85rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: 99px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.stat-pill strong {
  color: #fff;
  font-family: var(--font-mono);
}

/* 1D Memory Boxes */
.memory-grid-wrapper {
  overflow-x: auto;
  padding: 1.5rem 0.5rem;
  margin: 1rem 0;
  background: var(--bg-base);
  border-radius: var(--radius-md);
  border: 1px dashed var(--border-subtle);
}

.memory-boxes {
  display: flex;
  gap: 1.25rem;
  min-width: min-content;
}

.mem-slot {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--bg-surface);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem;
  min-width: 120px;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
}

.mem-slot:hover {
  border-color: var(--accent-cyan);
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
}

.mem-slot.active {
  border-color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.12);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.3);
}

.mem-slot.pulse {
  animation: pulseSlot 0.5s ease-out;
}

@keyframes pulseSlot {
  0% { transform: scale(0.95); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

.slot-idx {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-cyan);
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.slot-val {
  font-size: 1.15rem;
  font-weight: 700;
  color: #fff;
  padding: 0.5rem 0;
}

.slot-pointer {
  font-size: 0.72rem;
  color: var(--text-dim);
}

/* Sequential Search States */
.mem-slot.scan-active {
  border-color: #f59e0b !important;
  background: rgba(245, 158, 11, 0.15) !important;
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.35) !important;
  transform: translateY(-4px);
}

.mem-slot.scan-active .slot-idx {
  color: #f59e0b !important;
}

.mem-slot.scan-mismatch {
  opacity: 0.55;
  border-color: rgba(239, 68, 68, 0.35) !important;
  background: rgba(239, 68, 68, 0.05) !important;
}

.mem-slot.scan-matched {
  border-color: #10b981 !important;
  background: rgba(16, 185, 129, 0.2) !important;
  box-shadow: 0 0 24px rgba(16, 185, 129, 0.5) !important;
  transform: translateY(-6px) scale(1.04);
}

.mem-slot.scan-matched .slot-idx {
  color: #10b981 !important;
}

.mem-slot.scan-matched .slot-val {
  color: #a7f3d0 !important;
}

.search-pointer-badge {
  position: absolute;
  top: -24px;
  background: #f59e0b;
  color: #0f172a;
  font-weight: 700;
  font-size: 0.72rem;
  padding: 0.15rem 0.55rem;
  border-radius: 99px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
  white-space: nowrap;
  animation: bouncePointer 0.6s infinite alternate ease-in-out;
}

@keyframes bouncePointer {
  0% { transform: translateY(0); }
  100% { transform: translateY(-4px); }
}

.search-step-tracker {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.search-step-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.95rem;
  flex-wrap: wrap;
}

.search-status-badge {
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
}

.badge-danger {
  background: rgba(244, 63, 94, 0.15);
  color: #fda4af;
  border: 1px solid rgba(244, 63, 94, 0.3);
}

/* Visualizer Controls */
.vis-controls {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-top: 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-subtle);
}

.control-row {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
}

.vis-input {
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: #fff;
  padding: 0.6rem 0.85rem;
  font-size: 0.9rem;
  min-width: 160px;
}

.vis-input-small {
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: #fff;
  padding: 0.6rem 0.75rem;
  font-size: 0.9rem;
  width: 90px;
}

.vis-info-bar {
  margin-top: 1.25rem;
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-muted);
}

.vis-info-bar.success {
  background: rgba(16, 185, 129, 0.1);
  color: #a7f3d0;
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.vis-info-bar.error {
  background: rgba(244, 63, 94, 0.1);
  color: #fecdd3;
  border: 1px solid rgba(244, 63, 94, 0.25);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s ease;
  font-family: var(--font-main);
  text-decoration: none;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-indigo));
  color: #fff;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.25);
}

.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.35);
}

.btn-secondary {
  background: var(--bg-surface-elevated);
  color: #fff;
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-outline {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border-subtle);
}

.btn-outline:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.03);
}

.btn-danger {
  background: rgba(244, 63, 94, 0.15);
  color: var(--accent-rose);
  border: 1px solid rgba(244, 63, 94, 0.3);
}

.btn-danger:hover {
  background: rgba(244, 63, 94, 0.25);
}

.btn-warning {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.btn-warning:hover {
  background: rgba(245, 158, 11, 0.25);
}

.btn-success {
  background: linear-gradient(135deg, var(--accent-emerald), #059669);
  color: #fff;
  box-shadow: 0 4px 14px rgba(16, 185, 129, 0.25);
}

.btn-sm {
  padding: 0.45rem 0.85rem;
  font-size: 0.82rem;
}

.btn-xs {
  padding: 0.3rem 0.65rem;
  font-size: 0.75rem;
}

.btn.disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

/* NESTED IF SIMULATOR */
.nested-sim-body {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin: 1rem 0;
}

.sim-inputs-col {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.input-card {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.input-card label {
  font-size: 0.88rem;
  font-weight: 600;
  color: #cbd5e1;
}

.label-with-val {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.slider-val-badge {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.15);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
  font-size: 0.85rem;
}

.vis-range {
  width: 100%;
  accent-color: var(--accent-cyan);
  cursor: pointer;
}

.vis-range-small {
  width: 150px;
  accent-color: var(--accent-cyan);
}

.range-marks {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  color: var(--text-dim);
}

.btn-toggle-group {
  display: flex;
  gap: 0.5rem;
}

.toggle-btn {
  flex: 1;
  padding: 0.6rem;
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.2s;
}

.toggle-btn.active {
  background: rgba(56, 189, 248, 0.15);
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}

/* Decision Tree Flow */
.sim-flow-col {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.decision-tree {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.tree-node {
  width: 100%;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  transition: all 0.3s ease;
}

.tree-node.pass {
  border-color: var(--accent-emerald);
  background: rgba(16, 185, 129, 0.08);
  box-shadow: 0 0 15px rgba(16, 185, 129, 0.15);
}

.tree-node.fail {
  border-color: var(--accent-rose);
  background: rgba(244, 63, 94, 0.08);
}

.tree-node.disabled {
  opacity: 0.35;
  filter: grayscale(0.8);
}

.node-badge {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}

.node-title {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  color: #fff;
}

.node-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

.tree-line {
  width: 2px;
  height: 20px;
  background: var(--border-subtle);
  transition: background 0.3s;
}

.tree-line.active {
  background: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
}

.decision-result-card {
  margin-top: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 1.25rem 1.5rem;
  border-radius: var(--radius-md);
}

.decision-result-card.success {
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
}

.decision-result-card.warning {
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.3);
}

.decision-result-card.danger {
  background: rgba(244, 63, 94, 0.12);
  border: 1px solid rgba(244, 63, 94, 0.3);
}

.res-status-icon {
  font-size: 2rem;
  flex-shrink: 0;
}

.res-heading {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.2rem;
}

.highlight-status {
  color: var(--accent-cyan);
}

.res-text {
  font-size: 0.9rem;
  color: #cbd5e1;
}

/* NESTED LOOP & MATRIX VISUALIZER */
.matrix-vis-container {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.matrix-grid-table {
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.grid-col-headers {
  display: grid;
  grid-template-columns: 80px repeat(3, 1fr);
  gap: 0.75rem;
  text-align: center;
}

.header-blank {
  width: 80px;
}

.header-col {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  font-weight: 600;
  padding: 0.25rem;
  border-radius: 4px;
}

.header-col.col-highlight {
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
}

.grid-row-wrap {
  display: grid;
  grid-template-columns: 80px 1fr;
  gap: 0.75rem;
  align-items: center;
  border-radius: var(--radius-sm);
  padding: 0.25rem 0;
}

.grid-row-wrap.row-highlight {
  background: rgba(99, 102, 241, 0.08);
}

.header-row {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  font-weight: 600;
  text-align: right;
  padding-right: 0.5rem;
}

.grid-row-wrap.row-highlight .header-row {
  color: var(--accent-indigo);
}

.grid-cells {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.matrix-cell {
  background: var(--bg-surface-elevated);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.85rem 0.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  transition: all 0.25s ease;
}

.matrix-cell .cell-coords {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-dim);
}

.matrix-cell .cell-number {
  font-size: 1.25rem;
  font-weight: 800;
  color: #fff;
  margin-top: 0.15rem;
}

.matrix-cell.cell-visited {
  border-color: rgba(99, 102, 241, 0.35);
  background: rgba(99, 102, 241, 0.08);
}

.matrix-cell.current-active {
  border-color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.2);
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.4);
  transform: scale(1.04);
}

.active-badge-indicator {
  position: absolute;
  top: -10px;
  right: -5px;
  background: var(--accent-cyan);
  color: #0b0f19;
  font-size: 0.65rem;
  font-weight: 800;
  padding: 0.1rem 0.4rem;
  border-radius: 99px;
  font-family: var(--font-mono);
}

.matrix-step-log {
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.log-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.log-text {
  font-size: 0.95rem;
  color: #e2e8f0;
  line-height: 1.6;
}

.progress-bar-wrap {
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 99px;
  overflow: hidden;
  margin-top: 1.5rem;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-indigo), var(--accent-cyan));
  transition: width 0.3s ease;
}

/* QUICK LIVE DEMO BOX */
.quick-demo-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 2rem 0;
}

.demo-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.demo-title {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
}

.demo-editor-wrap textarea {
  width: 100%;
  background: var(--bg-code);
  color: #e2e8f0;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
  resize: vertical;
}

.demo-output-wrap {
  margin-top: 1rem;
  background: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 1rem;
}

.demo-output-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.demo-output-content {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: #a7f3d0;
  line-height: 1.5;
}

/* CODING LAB & INTERACTIVE EXERCISE */
.coding-lab-workspace {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.exercise-tabs-bar {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}

.ex-tab-btn {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  cursor: pointer;
  font-weight: 600;
  font-size: 0.88rem;
  white-space: nowrap;
  transition: all 0.2s ease;
}

.ex-tab-btn:hover {
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
}

.ex-tab-btn.active {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.15), rgba(99, 102, 241, 0.15));
  border-color: var(--accent-cyan);
  color: #fff;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3);
}

.ex-tab-btn.completed {
  border-color: rgba(16, 185, 129, 0.4);
}

.tab-indicator {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.72rem;
  font-weight: 700;
}

.ex-tab-btn.completed .tab-indicator {
  background: var(--accent-emerald);
  color: #0b0f19;
}

.ex-info-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1.75rem;
}

.ex-header-row {
  margin-bottom: 1rem;
}

.ex-meta {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.ex-title {
  font-size: 1.5rem;
  font-weight: 800;
  color: #fff;
}

.ex-description {
  font-size: 1rem;
  color: #cbd5e1;
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.ex-description code {
  font-family: var(--font-mono);
  background: rgba(255, 255, 255, 0.08);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  color: var(--accent-cyan);
  font-size: 0.9em;
}

.ex-testcases-preview {
  background: var(--bg-base);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
}

.preview-title {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.testcases-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.tc-item {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.tc-desc {
  display: block;
  font-weight: 600;
  color: #e2e8f0;
  margin-bottom: 0.15rem;
}

.tc-code code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent-cyan);
}

/* CODE EDITOR (IDE-LIKE) */
.code-editor-box {
  background: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.editor-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.25rem;
  background: rgba(255, 255, 255, 0.02);
  border-bottom: 1px solid var(--border-subtle);
}

.editor-file-title {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot.red { background: #ef4444; }
.dot.yellow { background: #f59e0b; }
.dot.green { background: #10b981; }

.filename {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-left: 0.35rem;
}

.editor-actions {
  display: flex;
  gap: 0.5rem;
}

.editor-area-wrap {
  display: flex;
  min-height: 260px;
  position: relative;
  background: #090d16;
}

.line-numbers {
  width: 45px;
  padding: 1rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--text-dim);
  text-align: right;
  user-select: none;
  border-right: 1px solid rgba(255, 255, 255, 0.05);
  background: rgba(0, 0, 0, 0.2);
  line-height: 1.6;
}

.ide-textarea {
  flex: 1;
  background: transparent;
  color: #f8fafc;
  border: none;
  outline: none;
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.6;
  resize: vertical;
  tab-size: 2;
  white-space: pre;
}

.editor-statusbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1.25rem;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
}

.status-left {
  font-size: 0.82rem;
  color: var(--text-dim);
}

.status-right {
  display: flex;
  gap: 0.75rem;
}

/* Accordion boxes (Hint & Solution) */
.accordion-box {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border-subtle);
}

.hint-box {
  background: rgba(245, 158, 11, 0.08);
  border-left: 4px solid var(--accent-amber);
}

.solution-box {
  background: rgba(99, 102, 241, 0.08);
  border-left: 4px solid var(--accent-indigo);
}

.box-header {
  font-weight: 700;
  font-size: 0.88rem;
  color: #fff;
  margin-bottom: 0.5rem;
}

.box-body {
  font-size: 0.9rem;
  color: #cbd5e1;
}

.box-body pre code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-cyan);
}

/* CONSOLE TERMINAL */
.console-terminal {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-code);
}

.terminal-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 1.25rem;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  font-size: 0.75rem;
  text-transform: uppercase;
  font-weight: 700;
  color: var(--text-muted);
}

.terminal-clear-btn {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.75rem;
  cursor: pointer;
}

.terminal-clear-btn:hover {
  color: var(--text-muted);
}

.terminal-body {
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  max-height: 280px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.term-line {
  line-height: 1.5;
}

.term-welcome {
  color: var(--text-dim);
}

.term-info {
  color: var(--accent-cyan);
}

.term-error {
  color: var(--accent-rose);
}

.term-muted {
  color: var(--text-dim);
}

.term-return {
  color: var(--accent-emerald);
  font-style: italic;
}

.log-log { color: #f1f5f9; }
.log-warn { color: var(--accent-amber); }
.log-error { color: var(--accent-rose); }
.log-info { color: var(--accent-cyan); }

/* Test Result Banner */
.test-result-banner {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

.test-result-banner.pass {
  background: rgba(16, 185, 129, 0.15);
  border: 1px solid var(--accent-emerald);
  color: #a7f3d0;
}

.test-result-banner.fail {
  background: rgba(244, 63, 94, 0.15);
  border: 1px solid var(--accent-rose);
  color: #fecdd3;
}

.banner-icon {
  font-size: 1.8rem;
}

.test-details-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.tc-result-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
}

.tc-result-card.tc-pass {
  border-left: 3px solid var(--accent-emerald);
}

.tc-result-card.tc-fail {
  border-left: 3px solid var(--accent-rose);
}

.tc-header {
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
}

.tc-body-diff {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.8rem;
}

.diff-row code {
  font-family: var(--font-mono);
  background: rgba(0, 0, 0, 0.3);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
}

.text-success { color: var(--accent-emerald); }
.text-danger { color: var(--accent-rose); }

/* Footer Nav */
.module-footer-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 0;
  border-top: 1px solid var(--border-subtle);
  margin-top: 3rem;
}

/* MODAL: SANDBOX & SERTIFIKAT */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.modal-overlay.open {
  display: flex;
}

.modal-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 900px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.75rem;
  border-bottom: 1px solid var(--border-subtle);
}

.modal-header h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
}

.modal-close-btn {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-dim);
  cursor: pointer;
}

.modal-close-btn:hover {
  color: #fff;
}

.modal-body {
  padding: 1.75rem;
}

/* E-SERTIFIKAT DIGITAL */
.certificate-preview-box {
  background: #0d1322;
  border: 4px double #d97706;
  border-radius: var(--radius-md);
  padding: 3rem 2.5rem;
  text-align: center;
  position: relative;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  margin-top: 1.5rem;
}

.cert-border-ornament {
  position: absolute;
  top: 10px;
  left: 10px;
  right: 10px;
  bottom: 10px;
  border: 1px solid rgba(217, 119, 6, 0.4);
  pointer-events: none;
}

.cert-watermark {
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.2em;
  color: #d97706;
  text-transform: uppercase;
}

.cert-title {
  font-size: 2.2rem;
  font-weight: 800;
  color: #fff;
  margin: 0.5rem 0 1.5rem;
  letter-spacing: -0.01em;
}

.cert-presented-to {
  font-size: 0.95rem;
  color: #94a3b8;
  margin-bottom: 0.5rem;
}

.cert-student-name {
  font-size: 2.5rem;
  font-weight: 800;
  color: #38bdf8;
  border-bottom: 2px solid rgba(56, 189, 248, 0.4);
  display: inline-block;
  padding: 0 2rem 0.35rem;
  margin-bottom: 1.5rem;
}

.cert-desc {
  font-size: 1rem;
  color: #cbd5e1;
  max-width: 650px;
  margin: 0 auto 2rem;
  line-height: 1.6;
}

.cert-signatures {
  display: flex;
  justify-content: space-around;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.sign-col {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.sign-title {
  font-size: 0.82rem;
  color: #94a3b8;
}

.sign-name {
  font-weight: 700;
  color: #fff;
  font-size: 0.95rem;
  margin-top: 0.5rem;
}

.cert-badge-gold {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  background: radial-gradient(circle, #f59e0b, #b45309);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.8rem;
  box-shadow: 0 0 20px rgba(245, 158, 11, 0.4);
}

/* Navigation Brand Row & Mobile Drawer Controls */
.navbar-brand-row {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.menu-toggle-btn {
  display: none;
  align-items: center;
  gap: 0.45rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  padding: 0.45rem 0.85rem;
  font-family: var(--font-main);
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s ease;
  user-select: none;
}

.menu-toggle-btn .menu-icon {
  font-size: 1.15rem;
  line-height: 1;
}

.menu-toggle-btn:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
}

body.light-theme .menu-toggle-btn {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #0f172a;
}

body.light-theme .menu-toggle-btn:hover {
  border-color: var(--accent-indigo);
  color: var(--accent-indigo);
  background: #f1f5f9;
}

.sidebar-close-btn {
  display: none;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 1.4rem;
  line-height: 1;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.sidebar-close-btn:hover {
  color: #fff;
  border-color: var(--accent-rose);
  background: rgba(244, 63, 94, 0.15);
}

body.light-theme .sidebar-close-btn {
  background: #f1f5f9;
  border-color: #cbd5e1;
  color: #475569;
}

body.light-theme .sidebar-close-btn:hover {
  color: #e11d48;
  border-color: #fda4af;
  background: #ffe4e6;
}

.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(10, 13, 20, 0.75);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 1050;
  opacity: 0;
  transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

.sidebar-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

/* Mobile Guide Modal & IP Card */
.mobile-guide-btn {
  border-color: rgba(56, 189, 248, 0.35);
  color: var(--accent-cyan);
}

.mobile-guide-btn:hover {
  background: rgba(56, 189, 248, 0.12);
  color: #fff;
  border-color: var(--accent-cyan);
}

body.light-theme .mobile-guide-btn {
  border-color: rgba(99, 102, 241, 0.35);
  color: var(--accent-indigo);
}

body.light-theme .mobile-guide-btn:hover {
  background: rgba(99, 102, 241, 0.1);
  color: #4338ca;
}

.ip-address-card {
  background: rgba(56, 189, 248, 0.06);
  border: 1.5px solid rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  margin: 1.25rem 0;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

body.light-theme .ip-address-card {
  background: #f0f9ff;
  border-color: #38bdf8;
}

.ip-card-label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.5rem;
}

body.light-theme .ip-card-label {
  color: #0369a1;
}

.ip-card-row {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}

.ip-input {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent-cyan);
  background: var(--bg-code);
  border-color: rgba(56, 189, 248, 0.4);
  letter-spacing: 0.02em;
}

body.light-theme .ip-input {
  background: #ffffff;
  color: #0284c7;
  border-color: #cbd5e1;
}

.ip-card-hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.mobile-steps-list {
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  font-size: 0.92rem;
  color: #cbd5e1;
}

body.light-theme .mobile-steps-list {
  color: #334155;
}

.mobile-steps-list li {
  line-height: 1.6;
}

.mobile-steps-list strong {
  color: #fff;
}

body.light-theme .mobile-steps-list strong {
  color: #0f172a;
}

.mobile-scroll-hint {
  display: none;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
  border: 1px dashed rgba(56, 189, 248, 0.3);
  border-radius: 99px;
  padding: 0.35rem 0.85rem;
  margin-bottom: 0.85rem;
  text-align: center;
}

body.light-theme .mobile-scroll-hint {
  background: rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.3);
  color: var(--accent-indigo);
}

/* Language Switcher */
.lang-toggle-group {
  display: inline-flex;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 3px;
  gap: 3px;
}

.lang-pill-btn {
  padding: 0.35rem 0.85rem;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: 6px;
  background: transparent;
  color: var(--text-muted);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-main);
}

.lang-pill-btn:hover {
  color: var(--text-main);
}

.lang-pill-btn.active {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-indigo));
  color: #fff;
  box-shadow: 0 2px 8px rgba(56, 189, 248, 0.35);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.95rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-main);
}

.theme-toggle-btn:hover {
  border-color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
}

/* COBA SENDIRI INTERACTIVE CARD */
.coba-sendiri-card {
  background: var(--bg-surface);
  border: 2px solid var(--accent-indigo);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 2rem 0;
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.15);
  position: relative;
  overflow: hidden;
}

.coba-sendiri-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.coba-sendiri-badge {
  font-size: 0.72rem;
  font-weight: 800;
  background: rgba(99, 102, 241, 0.15);
  color: var(--accent-indigo);
  padding: 0.25rem 0.75rem;
  border-radius: 99px;
  border: 1px solid rgba(99, 102, 241, 0.3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.coba-sendiri-title {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-main);
  margin-bottom: 0.35rem;
}

.coba-sendiri-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
}

.coba-sendiri-editor {
  width: 100%;
  background: var(--bg-code);
  color: #f8fafc;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.6;
  resize: vertical;
  tab-size: 4;
}

.coba-sendiri-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.85rem;
  align-items: center;
  flex-wrap: wrap;
}

.coba-sendiri-hint-box {
  margin-top: 1rem;
  padding: 1rem 1.25rem;
  background: rgba(245, 158, 11, 0.08);
  border-left: 4px solid var(--accent-amber);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-main);
  line-height: 1.6;
  display: none;
}

.coba-sendiri-output {
  margin-top: 1rem;
  background: var(--bg-code);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: #a7f3d0;
  line-height: 1.5;
  display: none;
}

.coba-sendiri-output-title {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

/* Print Styles for Certificate */
@media print {
  body * {
    visibility: hidden;
  }
  #certificateModal, #certificateModal * {
    visibility: visible;
  }
  #certificateModal {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: #fff;
    padding: 0;
    margin: 0;
  }
  .certificate-preview-box {
    background: #fff !important;
    color: #000 !important;
    border: 3px double #b45309 !important;
    box-shadow: none !important;
  }
  .cert-title, .sign-name {
    color: #000 !important;
  }
  .cert-student-name {
    color: #0284c7 !important;
  }
  .cert-desc, .cert-presented-to, .sign-title {
    color: #334155 !important;
  }
  .modal-header, .cert-input-wrap, .btn-print-wrap {
    display: none !important;
  }
}

/* ========================================================
   Dual Language Switcher & Theme Toggle Styles
   ======================================================== */
.lang-switch-group {
  display: inline-flex;
  background: rgba(255, 255, 255, 0.06);
  padding: 3px;
  border-radius: 99px;
  border: 1px solid var(--border-subtle);
  gap: 2px;
}

body.light-theme .lang-switch-group {
  background: #e2e8f0;
  border-color: #cbd5e1;
}

.lang-pill-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-main);
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.35rem 0.85rem;
  border-radius: 99px;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  user-select: none;
}

.lang-pill-btn:hover {
  color: var(--text-main);
}

.lang-pill-btn.active {
  background: var(--accent-indigo);
  color: #ffffff;
  box-shadow: 0 2px 10px rgba(99, 102, 241, 0.45);
}

.theme-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 600;
  border-radius: 99px;
  padding: 0.4rem 0.95rem;
  transition: all 0.2s ease;
  user-select: none;
}

.theme-toggle-btn:hover {
  border-color: var(--accent-indigo);
  color: var(--accent-indigo);
}

body.light-theme .theme-toggle-btn {
  background: #ffffff;
  color: #0f172a;
  border-color: #cbd5e1;
}

body.light-theme .theme-toggle-btn:hover {
  background: #f1f5f9;
  border-color: var(--accent-indigo);
  color: var(--accent-indigo);
}

body.light-theme .lang-pill-btn {
  color: #475569;
}

body.light-theme .lang-pill-btn:hover {
  color: #0f172a;
}

body.light-theme .lang-pill-btn.active {
  background: var(--accent-indigo);
  color: #ffffff;
}

/* ========================================================
   Light Theme Comprehensive Contrast Overrides
   ======================================================== */
body.light-theme .top-navbar {
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--border-subtle);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.05);
}

body.light-theme .brand-name {
  background: linear-gradient(135deg, #0f172a 40%, var(--accent-indigo));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

body.light-theme .header-progress-label {
  color: #334155;
}

body.light-theme .progress-track {
  background: #e2e8f0;
}

body.light-theme .curriculum-sidebar {
  background: #ffffff;
  border-right: 1px solid var(--border-subtle);
}

body.light-theme .sidebar-heading {
  color: #475569;
}

body.light-theme .nav-item {
  background: #f8fafc;
  border-color: #e2e8f0;
}

body.light-theme .nav-item:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

body.light-theme .nav-item.active {
  background: rgba(99, 102, 241, 0.08);
  border-color: var(--accent-indigo);
  box-shadow: 0 2px 10px rgba(99, 102, 241, 0.1);
}

body.light-theme .nav-item-title {
  color: #0f172a;
}

body.light-theme .nav-item-badge {
  color: var(--accent-indigo);
}

body.light-theme .sidebar-card-info {
  background: #f1f5f9 !important;
  border-color: #cbd5e1 !important;
}

/* Hero & Main Titles */
body.light-theme .module-main-title {
  background: linear-gradient(135deg, #0f172a 60%, #334155);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  color: #0f172a;
}

body.light-theme .module-subtitle {
  color: #334155;
}

body.light-theme .module-summary-card {
  background: rgba(99, 102, 241, 0.08);
  border-color: rgba(99, 102, 241, 0.25);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.03);
}

body.light-theme .summary-text {
  color: #1e293b;
  font-weight: 500;
}

body.light-theme .badge-muted {
  background: #e2e8f0;
  color: #334155;
}

/* Sections & Headings */
body.light-theme .module-section {
  background: #ffffff;
  border-color: #e2e8f0;
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.04);
}

body.light-theme .section-heading {
  color: #0f172a;
  border-left-color: var(--accent-indigo);
}

body.light-theme .section-body {
  color: #1e293b;
}

body.light-theme .section-body p {
  color: #1e293b;
}

body.light-theme .section-body :not(pre) > code {
  background: #e2e8f0;
  color: #4338ca;
  font-weight: 600;
}

body.light-theme .alert-box.tip {
  background: rgba(16, 185, 129, 0.12);
  border-color: rgba(16, 185, 129, 0.4);
  color: #065f46;
}

body.light-theme .alert-box.tip strong,
body.light-theme .alert-box.tip code {
  color: #064e3b;
}

body.light-theme .alert-box.note {
  background: rgba(56, 189, 248, 0.12);
  border-color: rgba(56, 189, 248, 0.4);
  color: #075985;
}

body.light-theme .alert-box.note strong,
body.light-theme .alert-box.note code {
  color: #0c4a6e;
}

/* Buttons in Light Theme */
body.light-theme .btn-secondary {
  background: #ffffff;
  color: #0f172a;
  border-color: #cbd5e1;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

body.light-theme .btn-secondary:hover {
  background: #f1f5f9;
  border-color: #94a3b8;
}

body.light-theme .btn-outline {
  background: #ffffff;
  color: #334155;
  border-color: #cbd5e1;
}

body.light-theme .btn-outline:hover {
  background: #f1f5f9;
  color: #0f172a;
  border-color: #94a3b8;
}

/* Visualizer Panels in Light Theme */
body.light-theme .visualizer-panel {
  background: #ffffff;
  border-color: #cbd5e1;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

body.light-theme .vis-title h4 {
  color: #0f172a;
}

body.light-theme .badge-tag {
  color: var(--accent-indigo);
}

body.light-theme .stat-pill {
  background: #f1f5f9;
  border-color: #cbd5e1;
  color: #475569;
}

body.light-theme .stat-pill strong {
  color: #0f172a;
}

body.light-theme .memory-grid-wrapper {
  background: #f8fafc;
  border-color: #cbd5e1;
}

body.light-theme .mem-slot {
  background: #ffffff;
  border-color: #cbd5e1;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

body.light-theme .mem-slot:hover {
  border-color: var(--accent-indigo);
  box-shadow: 0 6px 16px rgba(99, 102, 241, 0.15);
}

body.light-theme .mem-slot.active {
  background: rgba(99, 102, 241, 0.08);
  border-color: var(--accent-indigo);
  box-shadow: 0 0 15px rgba(99, 102, 241, 0.2);
}

body.light-theme .mem-slot.scan-active {
  background: #fef3c7 !important;
  border-color: #d97706 !important;
  box-shadow: 0 4px 12px rgba(217, 119, 6, 0.25) !important;
}

body.light-theme .mem-slot.scan-active .slot-idx {
  color: #b45309 !important;
}

body.light-theme .mem-slot.scan-matched {
  background: #d1fae5 !important;
  border-color: #059669 !important;
  box-shadow: 0 4px 14px rgba(5, 150, 105, 0.3) !important;
}

body.light-theme .mem-slot.scan-matched .slot-idx {
  color: #047857 !important;
}

body.light-theme .mem-slot.scan-matched .slot-val {
  color: #065f46 !important;
}

body.light-theme .mem-slot.scan-mismatch {
  background: #f8fafc !important;
  border-color: #e2e8f0 !important;
  opacity: 0.65;
}

body.light-theme .search-pointer-badge {
  background: #d97706;
  color: #fff;
}

body.light-theme .search-step-tracker {
  background: #f8fafc;
  border-color: #e2e8f0;
  color: #1e293b;
}

body.light-theme .badge-danger {
  background: #ffe4e6;
  color: #e11d48;
  border-color: #fecdd3;
}

body.light-theme .slot-idx {
  color: var(--accent-indigo);
}

body.light-theme .slot-val {
  color: #0f172a;
  font-weight: 800;
}

body.light-theme .slot-pointer {
  color: #64748b;
}

body.light-theme .vis-input,
body.light-theme .vis-input-small {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #0f172a;
}

body.light-theme .vis-input:focus,
body.light-theme .vis-input-small:focus {
  border-color: var(--accent-indigo);
  outline: none;
}

body.light-theme .vis-info-bar {
  background: #f1f5f9;
  color: #334155;
  border: 1px solid #cbd5e1;
}

body.light-theme .visual-memory-card {
  background: #ffffff;
  border-color: #cbd5e1;
}

body.light-theme .mem-item {
  background: #f8fafc;
  border-color: #cbd5e1;
}

body.light-theme .mem-item .val {
  color: #0f172a;
}

body.light-theme .modern-table th {
  background: #f1f5f9;
  color: #334155;
}

body.light-theme .modern-table td {
  color: #1e293b;
  border-color: #e2e8f0;
}

body.light-theme .modern-table td strong {
  color: #0f172a;
}

body.light-theme .stepper-box {
  background: #ffffff;
  border-color: #cbd5e1;
}

body.light-theme .step-line {
  background: #f8fafc;
  color: #1e293b;
}

/* Nested If in Light Theme */
body.light-theme .input-card {
  background: #f8fafc;
  border-color: #cbd5e1;
}

body.light-theme .input-card label {
  color: #0f172a;
}

body.light-theme .toggle-btn {
  background: #ffffff;
  border-color: #cbd5e1;
  color: #334155;
}

body.light-theme .toggle-btn.active {
  background: rgba(99, 102, 241, 0.12);
  border-color: var(--accent-indigo);
  color: var(--accent-indigo);
}

body.light-theme .tree-node {
  background: #ffffff;
  border-color: #cbd5e1;
}

body.light-theme .node-title {
  color: #0f172a;
}

body.light-theme .node-desc {
  color: #475569;
}

body.light-theme .res-heading {
  color: #0f172a;
}

body.light-theme .res-text {
  color: #334155;
}

body.light-theme .tree-line {
  background: #cbd5e1;
}

/* Matrix & Nested Loop in Light Theme */
body.light-theme .matrix-grid-table {
  background: #f8fafc;
  border-color: #cbd5e1;
}

body.light-theme .header-col {
  color: #475569;
}

body.light-theme .header-row {
  color: #475569;
}

body.light-theme .matrix-cell {
  background: #ffffff;
  border-color: #cbd5e1;
}

body.light-theme .matrix-cell .cell-coords {
  color: #64748b;
}

body.light-theme .matrix-cell .cell-number {
  color: #0f172a;
}

body.light-theme .matrix-step-log {
  background: #ffffff;
  border-color: #cbd5e1;
}

body.light-theme .log-title {
  color: #475569;
}

body.light-theme .log-text {
  color: #1e293b;
}

/* Coba Sendiri & Demo */
body.light-theme .coba-sendiri-card {
  background: #ffffff;
  border-color: #cbd5e1;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

body.light-theme .coba-sendiri-title {
  color: #0f172a;
}

body.light-theme .coba-sendiri-desc {
  color: #334155;
}

body.light-theme .coba-sendiri-hint-box {
  background: rgba(245, 158, 11, 0.12);
  color: #78350f;
  border-left-color: var(--accent-amber);
}

body.light-theme .quick-demo-card {
  background: #ffffff;
  border-color: #cbd5e1;
}

body.light-theme .demo-title {
  color: #0f172a;
}

/* Coding Lab in Light Theme */
body.light-theme .ex-tab-btn {
  background: #f1f5f9;
  border-color: #e2e8f0;
  color: #475569;
}

body.light-theme .ex-tab-btn.active {
  background: rgba(99, 102, 241, 0.12);
  border-color: var(--accent-indigo);
  color: var(--accent-indigo);
}

body.light-theme .ex-info-card {
  background: #ffffff;
  border-color: #cbd5e1;
}

body.light-theme .ex-title {
  color: #0f172a;
}

body.light-theme .ex-description {
  color: #334155;
}

body.light-theme .ex-description code {
  background: #e2e8f0;
  color: #4338ca;
}

body.light-theme .ex-testcases-preview {
  background: #f8fafc;
  border-color: #cbd5e1;
}

body.light-theme .preview-title {
  color: #475569;
}

body.light-theme .tc-desc {
  color: #0f172a;
}

body.light-theme .tc-code code {
  color: #4338ca;
}

body.light-theme .tc-result-card {
  background: #ffffff;
  border-color: #cbd5e1;
}

body.light-theme .tc-header {
  color: #0f172a;
}

body.light-theme .diff-row {
  color: #334155;
}

body.light-theme .diff-row code {
  background: #f1f5f9;
  color: #0f172a;
}

body.light-theme .accordion-box {
  background: #ffffff;
  border-color: #cbd5e1;
}

body.light-theme .box-header {
  color: #0f172a;
}

body.light-theme .box-body {
  color: #334155;
}

body.light-theme .modal-card {
  background: #ffffff;
  color: #0f172a;
  border-color: #cbd5e1;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

body.light-theme .modal-header {
  border-bottom-color: #e2e8f0;
}

/* ==========================================================================
   BINARY SEARCH VISUALIZER & ANIMATION STYLES
   ========================================================================== */

.bs-visualizer-panel {
  position: relative;
}

.bs-dataset-bar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.bs-dataset-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.bs-memory-wrapper {
  padding-top: 2.5rem;
  padding-bottom: 1.75rem;
}

.bs-slot {
  position: relative;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Slot states */
.bs-slot-in-range {
  border-color: rgba(56, 189, 248, 0.35);
  background: rgba(56, 189, 248, 0.05);
}

.bs-slot-eliminated {
  opacity: 0.32;
  filter: grayscale(0.85);
  background: repeating-linear-gradient(
    45deg,
    rgba(239, 68, 68, 0.06),
    rgba(239, 68, 68, 0.06) 8px,
    rgba(0, 0, 0, 0.12) 8px,
    rgba(0, 0, 0, 0.12) 16px
  ) !important;
  border-color: rgba(239, 68, 68, 0.2) !important;
  transform: scale(0.96);
}

.bs-slot-mid {
  border-color: #f59e0b !important;
  background: rgba(245, 158, 11, 0.16) !important;
  box-shadow: 0 0 25px rgba(245, 158, 11, 0.45) !important;
  transform: translateY(-5px) scale(1.05);
  z-index: 5;
}

.bs-slot-mid .slot-idx {
  color: #f59e0b !important;
}

.bs-slot-mid .slot-val {
  color: #fef3c7 !important;
  text-shadow: 0 0 10px rgba(245, 158, 11, 0.5);
}

.bs-slot-match {
  border-color: #10b981 !important;
  background: rgba(16, 185, 129, 0.25) !important;
  box-shadow: 0 0 35px rgba(16, 185, 129, 0.6) !important;
  transform: translateY(-8px) scale(1.08);
  z-index: 10;
}

.bs-slot-match .slot-idx {
  color: #10b981 !important;
}

.bs-slot-match .slot-val {
  color: #a7f3d0 !important;
  text-shadow: 0 0 15px rgba(16, 185, 129, 0.8);
}

/* Pointer Badges on Top */
.bs-pointer-badge {
  position: absolute;
  top: -28px;
  font-weight: 700;
  font-size: 0.72rem;
  padding: 0.2rem 0.6rem;
  border-radius: 99px;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  animation: bouncePointer 0.65s infinite alternate ease-in-out;
  z-index: 8;
  letter-spacing: 0.02em;
}

.bs-badge-awal {
  background: #10b981;
  color: #ffffff;
}

.bs-badge-tengah {
  background: #f59e0b;
  color: #0f172a;
}

.bs-badge-akhir {
  background: #f43f5e;
  color: #ffffff;
}

.bs-badge-awal-tengah {
  background: linear-gradient(135deg, #10b981, #f59e0b);
  color: #0f172a;
}

.bs-badge-tengah-akhir {
  background: linear-gradient(135deg, #f59e0b, #f43f5e);
  color: #0f172a;
}

.bs-badge-awal-akhir {
  background: linear-gradient(135deg, #10b981, #f43f5e);
  color: #ffffff;
}

.bs-badge-all {
  background: linear-gradient(135deg, #10b981 0%, #f59e0b 50%, #f43f5e 100%);
  color: #ffffff;
  font-weight: 800;
}

/* Math & Decision Flow Cards */
.bs-math-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.bs-math-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
}

.bs-math-card-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.92rem;
  color: var(--text-main);
  margin-bottom: 0.75rem;
}

.bs-formula-code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  background: var(--bg-base);
  padding: 0.4rem 0.65rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  margin-bottom: 0.5rem;
}

.bs-formula-calc {
  font-family: var(--font-mono);
  font-size: 0.95rem;
}

.bs-decision-tag {
  display: inline-block;
  font-weight: 700;
  font-size: 0.85rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
}

.decision-success {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.decision-warning {
  background: rgba(245, 158, 11, 0.18);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.4);
}

.decision-danger {
  background: rgba(244, 63, 94, 0.18);
  color: #fda4af;
  border: 1px solid rgba(244, 63, 94, 0.4);
}

.bs-decision-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Tracer Table */
.bs-tracer-wrapper {
  margin-top: 1.25rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem;
}

.bs-tracer-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 0.6rem;
}

.bs-tracer-table th {
  font-size: 0.8rem;
  padding: 0.6rem 0.75rem;
}

.bs-tracer-table td {
  font-size: 0.85rem;
  padding: 0.55rem 0.75rem;
}

.bs-tracer-table .tr-success {
  background: rgba(16, 185, 129, 0.12) !important;
}

/* Light Theme Overrides */
body.light-theme .bs-dataset-bar {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

body.light-theme .bs-slot-in-range {
  background: rgba(2, 132, 199, 0.06);
  border-color: rgba(2, 132, 199, 0.3);
}

body.light-theme .bs-slot-eliminated {
  background: repeating-linear-gradient(
    45deg,
    rgba(239, 68, 68, 0.08),
    rgba(239, 68, 68, 0.08) 8px,
    rgba(241, 245, 249, 0.8) 8px,
    rgba(241, 245, 249, 0.8) 16px
  ) !important;
  border-color: #e2e8f0 !important;
}

body.light-theme .bs-slot-mid {
  background: rgba(245, 158, 11, 0.12) !important;
  border-color: #f59e0b !important;
}

body.light-theme .bs-slot-mid .slot-val {
  color: #b45309 !important;
}

body.light-theme .bs-slot-match {
  background: rgba(16, 185, 129, 0.15) !important;
  border-color: #10b981 !important;
}

body.light-theme .bs-slot-match .slot-val {
  color: #065f46 !important;
}

body.light-theme .bs-math-card {
  background: #ffffff;
  border-color: #cbd5e1;
}

body.light-theme .bs-formula-code {
  background: #f8fafc;
  color: #0284c7;
  border-color: #e2e8f0;
}

body.light-theme .bs-tracer-wrapper {
  background: #ffffff;
  border-color: #cbd5e1;
}

body.light-theme .bs-tracer-title {
  color: #0284c7;
}

/* ==========================================================================
   SELECTION SORT VISUALIZER & ANIMATION STYLES
   ========================================================================== */

.ss-visualizer-panel {
  position: relative;
}

.ss-memory-wrapper {
  padding-top: 2.5rem;
  padding-bottom: 1.75rem;
}

.ss-slot {
  position: relative;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

/* Mini Bar Track & Fill */
.ss-bar-track {
  width: 100%;
  height: 48px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: flex-end;
  padding: 3px;
  margin-bottom: 0.65rem;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.ss-bar-fill {
  width: 100%;
  background: linear-gradient(180deg, var(--accent-cyan), var(--accent-indigo));
  border-radius: 4px;
  transition: height 0.4s ease, background 0.4s ease;
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.3);
}

/* Sorted Slot */
.ss-slot-sorted {
  border-color: #10b981 !important;
  background: rgba(16, 185, 129, 0.12) !important;
}

.ss-slot-sorted .ss-bar-fill {
  background: linear-gradient(180deg, #34d399, #10b981) !important;
  box-shadow: 0 0 12px rgba(16, 185, 129, 0.5) !important;
}

.ss-slot-sorted .slot-idx {
  color: #10b981 !important;
}

.ss-slot-sorted .slot-val {
  color: #a7f3d0 !important;
}

/* Target I Slot */
.ss-slot-target {
  border-color: var(--accent-cyan) !important;
  background: rgba(56, 189, 248, 0.15) !important;
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.35) !important;
  transform: translateY(-4px);
}

/* Min Found Slot */
.ss-slot-min {
  border-color: #f59e0b !important;
  background: rgba(245, 158, 11, 0.18) !important;
  box-shadow: 0 0 24px rgba(245, 158, 11, 0.5) !important;
  transform: translateY(-6px) scale(1.04);
}

.ss-slot-min .ss-bar-fill {
  background: linear-gradient(180deg, #fbbf24, #f59e0b) !important;
  box-shadow: 0 0 15px rgba(245, 158, 11, 0.6) !important;
}

.ss-slot-min .slot-val {
  color: #fef3c7 !important;
  text-shadow: 0 0 8px rgba(245, 158, 11, 0.6);
}

/* Swapped Slots */
.ss-slot-swapped {
  border-color: #a855f7 !important;
  background: rgba(168, 85, 247, 0.22) !important;
  box-shadow: 0 0 30px rgba(168, 85, 247, 0.6) !important;
  transform: translateY(-8px) scale(1.06);
}

.ss-slot-swapped .ss-bar-fill {
  background: linear-gradient(180deg, #c084fc, #a855f7) !important;
}

/* Light Theme Overrides for Selection Sort */
body.light-theme .ss-bar-track {
  background: #e2e8f0;
  border-color: #cbd5e1;
}

body.light-theme .ss-slot-sorted {
  background: rgba(16, 185, 129, 0.1) !important;
  border-color: #10b981 !important;
}

body.light-theme .ss-slot-sorted .slot-val {
  color: #065f46 !important;
}

body.light-theme .ss-slot-target {
  background: rgba(2, 132, 199, 0.08) !important;
  border-color: #0284c7 !important;
}

body.light-theme .ss-slot-min {
  background: rgba(245, 158, 11, 0.12) !important;
  border-color: #f59e0b !important;
}

body.light-theme .ss-slot-min .slot-val {
  color: #b45309 !important;
}

body.light-theme .ss-slot-swapped {
  background: rgba(168, 85, 247, 0.12) !important;
  border-color: #9333ea !important;
}

/* ==========================================================================
   INSERTION SORT VISUALIZER & ANIMATION STYLES
   ========================================================================== */

.is-visualizer-panel {
  position: relative;
}

.is-memory-wrapper {
  padding-top: 2.5rem;
  padding-bottom: 1.75rem;
}

.is-slot {
  position: relative;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

/* Mini Bar Track & Fill */
.is-bar-track {
  width: 100%;
  height: 48px;
  background: rgba(255, 255, 255, 0.04);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: flex-end;
  padding: 3px;
  margin-bottom: 0.65rem;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.is-bar-fill {
  width: 100%;
  background: linear-gradient(180deg, #ec4899, #8b5cf6);
  border-radius: 4px;
  transition: height 0.4s ease, background 0.4s ease;
  box-shadow: 0 0 10px rgba(236, 72, 153, 0.3);
}

/* Sorted Slot */
.is-slot-sorted {
  border-color: #10b981 !important;
  background: rgba(16, 185, 129, 0.12) !important;
}

.is-slot-sorted .is-bar-fill {
  background: linear-gradient(180deg, #34d399, #10b981) !important;
  box-shadow: 0 0 12px rgba(16, 185, 129, 0.5) !important;
}

.is-slot-sorted .slot-idx {
  color: #10b981 !important;
}

.is-slot-sorted .slot-val {
  color: #a7f3d0 !important;
}

/* Next Card to be Inserted */
.is-slot-next {
  border-color: var(--accent-cyan) !important;
  background: rgba(56, 189, 248, 0.15) !important;
  box-shadow: 0 0 20px rgba(56, 189, 248, 0.35) !important;
  transform: translateY(-4px);
}

/* Shifted Elements Slot */
.is-slot-shifted {
  border-color: #f59e0b !important;
  background: rgba(245, 158, 11, 0.18) !important;
  box-shadow: 0 0 22px rgba(245, 158, 11, 0.45) !important;
  transform: translateY(-4px);
}

.is-slot-shifted .is-bar-fill {
  background: linear-gradient(180deg, #fbbf24, #f59e0b) !important;
  box-shadow: 0 0 14px rgba(245, 158, 11, 0.5) !important;
}

.is-slot-shifted .slot-val {
  color: #fef3c7 !important;
}

/* Newly Inserted Key Slot (Card lift and pulse) */
.is-slot-inserted {
  border-color: #ec4899 !important;
  background: rgba(236, 72, 153, 0.22) !important;
  box-shadow: 0 0 32px rgba(236, 72, 153, 0.65) !important;
  transform: translateY(-10px) scale(1.06);
}

.is-slot-inserted .is-bar-fill {
  background: linear-gradient(180deg, #f472b6, #ec4899) !important;
}

.is-slot-inserted .slot-val {
  color: #fce7f3 !important;
  text-shadow: 0 0 10px rgba(236, 72, 153, 0.7);
}

/* Light Theme Overrides for Insertion Sort */
body.light-theme .is-bar-track {
  background: #e2e8f0;
  border-color: #cbd5e1;
}

body.light-theme .is-slot-sorted {
  background: rgba(16, 185, 129, 0.1) !important;
  border-color: #10b981 !important;
}

body.light-theme .is-slot-sorted .slot-val {
  color: #065f46 !important;
}

body.light-theme .is-slot-next {
  background: rgba(2, 132, 199, 0.08) !important;
  border-color: #0284c7 !important;
}

body.light-theme .is-slot-shifted {
  background: rgba(245, 158, 11, 0.12) !important;
  border-color: #f59e0b !important;
}

body.light-theme .is-slot-shifted .slot-val {
  color: #b45309 !important;
}

body.light-theme .is-slot-inserted {
  background: rgba(236, 72, 153, 0.14) !important;
  border-color: #db2777 !important;
}

body.light-theme .is-slot-inserted .slot-val {
  color: #9d174d !important;
}

/* ==========================================================================
   DECISION TREE VISUALIZER & ANIMATION STYLES
   ========================================================================== */

.dt-visualizer-panel {
  position: relative;
}

.dt-legend-bar {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  flex-wrap: wrap;
  padding: 0.75rem 1rem;
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  margin-bottom: 1.5rem;
  font-size: 0.82rem;
}

.dt-legend-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.dt-legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
  box-shadow: 0 0 8px currentColor;
}

/* Tree Canvas Layout */
.dt-tree-wrapper {
  background: radial-gradient(circle at 50% 20%, rgba(16, 185, 129, 0.05), transparent 70%), var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 2rem 1.25rem;
  margin-bottom: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  overflow-x: auto;
}

.dt-level {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  position: relative;
}

.dt-level-1 {
  z-index: 4;
}

.dt-level-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  z-index: 3;
}

.dt-level-3 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  z-index: 2;
}

.dt-level-4 {
  display: flex;
  z-index: 1;
}

.dt-leaves-subgroup {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  flex: 2;
}

.dt-subbranch-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

/* Node Cards */
.dt-node-card {
  background: var(--bg-surface-elevated);
  border: 2px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  text-align: center;
  transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  min-width: 170px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
}

.dt-node-root {
  border-color: rgba(16, 185, 129, 0.4);
  max-width: 280px;
}

.dt-node-decision {
  border-color: rgba(56, 189, 248, 0.35);
  width: 100%;
  max-width: 240px;
}

.dt-node-leaf {
  border-color: rgba(236, 72, 153, 0.35);
  width: 100%;
  background: rgba(236, 72, 153, 0.04);
}

.dt-node-badge {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.5rem;
  border-radius: 99px;
  margin-bottom: 0.4rem;
}

.dt-badge-root {
  background: rgba(16, 185, 129, 0.2);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.dt-badge-decision {
  background: rgba(56, 189, 248, 0.2);
  color: #38bdf8;
  border: 1px solid rgba(56, 189, 248, 0.4);
}

.dt-badge-leaf {
  background: rgba(236, 72, 153, 0.2);
  color: #f472b6;
  border: 1px solid rgba(236, 72, 153, 0.4);
}

.dt-node-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.35;
}

.dt-node-sub {
  font-size: 0.72rem;
  color: var(--text-dim);
  margin-top: 0.25rem;
}

.dt-leaf-icon {
  font-size: 1.75rem;
  margin-bottom: 0.25rem;
}

/* Active Highlight & Pulse */
.dt-node-active {
  transform: translateY(-4px) scale(1.03);
  box-shadow: 0 0 25px rgba(56, 189, 248, 0.5) !important;
}

.dt-node-root.dt-node-active {
  border-color: #10b981 !important;
  box-shadow: 0 0 25px rgba(16, 185, 129, 0.5) !important;
}

.dt-node-decision.dt-node-active {
  border-color: #38bdf8 !important;
  box-shadow: 0 0 25px rgba(56, 189, 248, 0.55) !important;
}

.dt-node-winner {
  border-color: #ec4899 !important;
  background: rgba(236, 72, 153, 0.2) !important;
  box-shadow: 0 0 32px rgba(236, 72, 153, 0.7) !important;
  transform: translateY(-6px) scale(1.06);
}

.dt-node-winner .dt-node-title {
  color: #fce7f3;
  text-shadow: 0 0 10px rgba(236, 72, 153, 0.8);
}

/* Connecting Branches & Labels */
.dt-branch-row {
  display: flex;
  justify-content: space-around;
  width: 100%;
}

.dt-branch-row.sub {
  gap: 0.75rem;
  justify-content: center;
}

.dt-branch-pill {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.65rem;
  border-radius: 99px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px dashed var(--border-subtle);
  color: var(--text-dim);
  transition: all 0.3s ease;
}

.dt-branch-pill.mini {
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
}

.dt-branch-pill.pill-active {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-indigo));
  color: #0b0f19;
  border: 1px solid transparent;
  box-shadow: 0 0 12px rgba(56, 189, 248, 0.5);
  font-weight: 800;
}

/* Light Theme Overrides */
body.light-theme .dt-tree-wrapper {
  background: radial-gradient(circle at 50% 20%, rgba(16, 185, 129, 0.08), transparent 70%), #ffffff;
  border-color: #cbd5e1;
}

body.light-theme .dt-legend-bar {
  background: #f8fafc;
  border-color: #cbd5e1;
}

body.light-theme .dt-node-card {
  background: #ffffff;
  border-color: #cbd5e1;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

body.light-theme .dt-node-title {
  color: #0f172a;
}

body.light-theme .dt-node-sub {
  color: #64748b;
}

body.light-theme .dt-branch-pill {
  background: #f1f5f9;
  border-color: #cbd5e1;
  color: #64748b;
}

body.light-theme .dt-branch-pill.pill-active {
  background: #0284c7;
  color: #ffffff;
}

body.light-theme .dt-node-winner {
  background: rgba(236, 72, 153, 0.12) !important;
  border-color: #db2777 !important;
}

body.light-theme .dt-node-winner .dt-node-title {
  color: #9d174d;
}

/* ==========================================================================
   COMPREHENSIVE RESPONSIVE DESIGN SYSTEM
   Supports Desktop, Tablet, Phablet, and Mobile Smartphones
   ========================================================================== */

/* 1. Large Tablets & Small Laptops (<= 1024px) */
@media (max-width: 1024px) {
  /* Layout: Convert Sidebar to Off-Canvas Mobile Drawer */
  .menu-toggle-btn {
    display: inline-flex;
  }

  .sidebar-close-btn {
    display: flex;
  }

  .sidebar-backdrop {
    display: block;
  }

  .curriculum-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 320px;
    max-width: 86vw;
    height: 100vh;
    height: 100dvh;
    z-index: 1100;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: none;
    border-right: 1px solid var(--border-subtle);
    border-bottom: none;
    padding-top: 1.25rem;
  }

  .curriculum-sidebar.open {
    transform: translateX(0);
    box-shadow: 12px 0 40px rgba(0, 0, 0, 0.75);
  }

  .main-layout {
    display: block;
    width: 100%;
  }

  .content-viewport {
    width: 100%;
    max-width: 100%;
    padding: 2rem 1.5rem;
  }

  .header-progress-wrap {
    min-width: 170px;
  }

  .nested-sim-body {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }

  .matrix-vis-container {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
}

/* 2. Tablet Portrait & Standard Mobile (<= 768px) */
@media (max-width: 768px) {
  /* Top Navigation */
  .top-navbar {
    padding: 0.65rem 0.85rem;
    gap: 0.5rem;
    flex-wrap: wrap;
  }

  .navbar-brand-row {
    gap: 0.5rem;
  }

  .brand-wrap {
    gap: 0.5rem;
  }

  .brand-logo-icon {
    width: 34px;
    height: 34px;
    font-size: 1.15rem;
  }

  .brand-name {
    font-size: 1.05rem;
  }

  .brand-author {
    display: none;
  }

  .header-progress-wrap {
    order: 3;
    width: 100%;
    min-width: 100%;
    margin-top: 0.2rem;
  }

  .header-progress-label {
    font-size: 0.72rem;
  }

  .progress-track {
    height: 4px;
  }

  .nav-actions {
    gap: 0.35rem;
  }

  .nav-actions .btn {
    padding: 0.35rem 0.6rem;
    font-size: 0.78rem;
  }

  .theme-toggle-btn {
    padding: 0.35rem 0.6rem;
  }

  .theme-toggle-btn #themeToggleText {
    display: none;
  }

  .nav-btn-text {
    display: none;
  }

  /* Content Viewport */
  .content-viewport {
    padding: 1.25rem 0.85rem;
  }

  .module-header-hero {
    margin-bottom: 1.5rem;
  }

  .module-main-title {
    font-size: 1.55rem;
    line-height: 1.25;
  }

  .module-subtitle {
    font-size: 0.92rem;
    margin-bottom: 1rem;
  }

  .module-summary-card {
    padding: 0.85rem 1rem;
    gap: 0.65rem;
    flex-direction: column;
    align-items: flex-start;
  }

  .summary-text {
    font-size: 0.88rem;
  }

  .section-heading {
    font-size: 1.2rem;
    padding-left: 0.65rem;
  }

  .section-body {
    font-size: 0.92rem;
    gap: 0.85rem;
  }

  .alert-box {
    padding: 0.85rem 1rem;
    gap: 0.75rem;
  }

  .code-preview {
    padding: 0.85rem 1rem;
    border-radius: var(--radius-sm);
  }

  .code-preview pre code {
    font-size: 0.82rem !important;
  }

  /* Visualizer Panels */
  .visualizer-panel {
    padding: 1.1rem 0.85rem;
    border-radius: var(--radius-md);
    margin-bottom: 1.75rem;
  }

  .vis-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.65rem;
    margin-bottom: 1rem;
  }

  .vis-title h4 {
    font-size: 1.12rem;
  }

  .vis-stats {
    width: 100%;
    gap: 0.4rem;
  }

  .stat-pill {
    font-size: 0.75rem;
    padding: 0.3rem 0.6rem;
  }

  /* Visualizer Controls & Inputs */
  .vis-controls {
    margin-top: 1rem;
    padding-top: 1rem;
    gap: 0.65rem;
  }

  .control-row {
    gap: 0.5rem;
    width: 100%;
    align-items: stretch;
  }

  .control-row.secondary {
    align-items: center;
  }

  .vis-input {
    min-width: 0;
    width: 100%;
    flex: 1 1 120px;
    font-size: 0.85rem;
    padding: 0.5rem 0.75rem;
  }

  .vis-input-small {
    width: 70px;
    font-size: 0.85rem;
    padding: 0.5rem;
  }

  .control-row .btn,
  .vis-controls .btn {
    flex: 1 1 auto;
    text-align: center;
    justify-content: center;
    padding: 0.45rem 0.75rem;
    font-size: 0.78rem;
  }

  /* Memory Grid Wrapper */
  .memory-grid-wrapper,
  .bs-memory-wrapper,
  .ss-memory-wrapper,
  .is-memory-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 1.75rem 0.5rem 1rem;
  }

  .memory-boxes {
    gap: 0.85rem;
  }

  .mem-slot {
    min-width: 95px;
    padding: 0.75rem 0.5rem;
  }

  .slot-idx {
    font-size: 0.75rem;
  }

  .slot-val {
    font-size: 1.05rem;
    padding: 0.35rem 0;
  }

  /* Math Grid & Cards (Binary Search, Sorting) */
  .bs-math-grid {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }

  .bs-math-card {
    padding: 0.85rem 1rem;
  }

  .bs-tracer-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 0.75rem;
  }

  .bs-dataset-bar {
    padding: 0.65rem 0.75rem;
    gap: 0.4rem;
  }

  /* Decision Tree Simulator */
  .mobile-scroll-hint {
    display: block;
  }

  .dt-tree-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 1.25rem 0.75rem;
  }

  .dt-level-2,
  .dt-level-3,
  .dt-level-4 {
    min-width: 650px;
  }

  .dt-branch-row {
    min-width: 650px;
  }

  .dt-node-card {
    min-width: 150px;
    padding: 0.75rem 0.85rem;
  }

  .dt-legend-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.6rem;
    padding: 0.75rem;
  }

  /* Nested If Simulator */
  .input-card {
    padding: 1rem;
  }

  .tree-node {
    padding: 0.85rem 1rem;
  }

  .decision-result-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.65rem;
    padding: 0.85rem 1rem;
  }

  /* Nested Loop & Matrix 2D */
  .matrix-grid-table {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: 0.75rem;
  }

  .grid-col-headers,
  .grid-row-wrap {
    min-width: 290px;
  }

  .matrix-cell {
    padding: 0.65rem 0.35rem;
  }

  .matrix-cell .cell-number {
    font-size: 1.05rem;
  }

  /* Coba Sendiri Card */
  .coba-sendiri-card {
    padding: 1.1rem 0.85rem;
    margin: 1.5rem 0;
  }

  .coba-sendiri-title {
    font-size: 1.05rem;
  }

  .coba-sendiri-desc {
    font-size: 0.88rem;
  }

  .coba-sendiri-editor {
    font-size: 0.85rem;
    padding: 0.75rem;
  }

  .coba-sendiri-actions {
    gap: 0.45rem;
  }

  .coba-sendiri-actions .btn {
    flex: 1 1 auto;
    justify-content: center;
  }

  /* Coding Lab & IDE */
  .exercise-tabs-bar {
    gap: 0.35rem;
    padding-bottom: 0.35rem;
  }

  .ex-tab-btn {
    padding: 0.45rem 0.75rem;
    font-size: 0.78rem;
  }

  .ex-info-card {
    padding: 1.1rem 0.85rem;
  }

  .ex-title {
    font-size: 1.25rem;
  }

  .ex-description {
    font-size: 0.9rem;
  }

  .editor-topbar {
    padding: 0.5rem 0.75rem;
    flex-wrap: wrap;
    gap: 0.4rem;
  }

  .editor-area-wrap {
    min-height: 200px;
  }

  .line-numbers {
    width: 32px;
    padding: 0.75rem 0.2rem;
    font-size: 0.78rem;
  }

  .ide-textarea {
    font-size: 0.85rem;
    padding: 0.75rem 0.5rem;
  }

  .editor-statusbar {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    padding: 0.6rem 0.75rem;
  }

  .status-right {
    width: 100%;
    flex-wrap: wrap;
    gap: 0.4rem;
  }

  .status-right .btn {
    flex: 1 1 45%;
    justify-content: center;
    padding: 0.45rem 0.65rem;
    font-size: 0.78rem;
  }

  .terminal-body {
    padding: 0.85rem;
    font-size: 0.82rem;
    max-height: 200px;
  }

  /* Modals */
  .modal-overlay {
    padding: 0.5rem;
    align-items: flex-end;
  }

  .modal-card {
    max-height: 92vh;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
  }

  .modal-header {
    padding: 0.85rem 1rem;
  }

  .modal-header h3 {
    font-size: 1.05rem;
  }

  .modal-body {
    padding: 1rem;
  }

  /* Certificate Preview in Modal */
  .certificate-preview-box {
    padding: 1.5rem 0.85rem;
    border-width: 2px;
  }

  .cert-watermark {
    font-size: 0.7rem;
    letter-spacing: 0.1em;
  }

  .cert-title {
    font-size: 1.35rem;
    margin: 0.35rem 0 0.85rem;
  }

  .cert-student-name {
    font-size: 1.35rem;
    padding: 0 0.5rem 0.2rem;
    margin-bottom: 1rem;
  }

  .cert-desc {
    font-size: 0.82rem;
    line-height: 1.5;
    margin-bottom: 1.25rem;
  }

  .cert-signatures {
    flex-direction: column;
    gap: 1.25rem;
    align-items: center;
    margin-top: 1.5rem;
    padding-top: 1rem;
  }

  .cert-badge-gold {
    width: 50px;
    height: 50px;
    font-size: 1.3rem;
  }

  .cert-input-wrap {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }

  .cert-input-wrap .btn {
    width: 100%;
    justify-content: center;
  }

  /* Footer Navigation */
  .module-footer-nav {
    flex-direction: column;
    gap: 0.75rem;
    padding: 1.5rem 0;
    margin-top: 2rem;
  }

  .module-footer-nav .btn {
    width: 100%;
    justify-content: center;
  }
}

/* 3. Small Smartphones (<= 480px) */
@media (max-width: 480px) {
  .top-navbar {
    padding: 0.55rem 0.65rem;
  }

  .brand-name {
    font-size: 0.95rem;
  }

  .lang-pill-btn {
    padding: 0.25rem 0.45rem;
    font-size: 0.72rem;
  }

  .module-main-title {
    font-size: 1.35rem;
  }

  .coba-sendiri-actions .btn {
    flex: 1 1 100%;
  }

  .ip-card-row {
    flex-direction: column;
    align-items: stretch;
  }

  .ip-card-row .btn {
    width: 100%;
    justify-content: center;
  }

  .status-right .btn {
    flex: 1 1 100%;
  }
}

/* 4. Ultra Small Smartphones (<= 360px) */
@media (max-width: 360px) {
  .menu-toggle-btn .menu-text {
    display: none;
  }

  .brand-logo-icon {
    width: 30px;
    height: 30px;
    font-size: 1rem;
  }

  .brand-name {
    font-size: 0.88rem;
  }

  .content-viewport {
    padding: 1rem 0.5rem;
  }
}

/* ==========================================================================
   Embedded Video Card Component
   ========================================================================== */
.video-container-card {
  margin: 1.5rem 0;
  border-radius: var(--radius-lg);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.video-container-card:hover {
  border-color: rgba(239, 68, 68, 0.4);
  box-shadow: 0 8px 28px rgba(239, 68, 68, 0.12), var(--shadow-md);
}

.video-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid var(--border-subtle);
}

.video-card-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.video-badge {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.2rem 0.6rem;
  border-radius: 9999px;
  background: rgba(239, 68, 68, 0.15);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.3);
}

.video-title {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text-main);
}

.video-desc {
  margin: 0;
  font-size: 0.84rem;
  color: var(--text-muted);
}

.video-external-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.85rem;
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: var(--radius-sm);
  background: rgba(239, 68, 68, 0.12);
  border: 1px solid rgba(239, 68, 68, 0.35);
  color: #fca5a5;
  text-decoration: none;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.video-external-btn svg {
  flex-shrink: 0;
}

.video-external-btn:hover {
  background: #ef4444;
  color: #ffffff;
  border-color: #ef4444;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.35);
}

.video-iframe-wrapper {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
  height: 0;
  background: #000000;
}

.video-iframe-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* Light Theme Support */
body.light-theme .video-container-card {
  background: #ffffff;
  border-color: #e2e8f0;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
}

body.light-theme .video-card-header {
  background: #f8fafc;
  border-bottom-color: #e2e8f0;
}

body.light-theme .video-title {
  color: #0f172a;
}

body.light-theme .video-desc {
  color: #64748b;
}

body.light-theme .video-external-btn {
  background: rgba(239, 68, 68, 0.08);
  border-color: rgba(239, 68, 68, 0.25);
  color: #dc2626;
}

body.light-theme .video-external-btn:hover {
  background: #ef4444;
  color: #ffffff;
  border-color: #ef4444;
}

/* ==========================================================================
   Linear Regression (Regresi Linear) Simulator Styles
   ========================================================================== */
.lr-visualizer-panel {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  margin: 1.5rem 0;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.lr-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
  gap: 1.25rem;
  margin-top: 1.25rem;
}

@media (max-width: 980px) {
  .lr-grid {
    grid-template-columns: 1fr;
  }
}

.lr-chart-card {
  background: #090d16;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.4);
}

.lr-chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.lr-chart-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.lr-chart-tip {
  font-size: 0.76rem;
  color: var(--accent-cyan);
  background: rgba(56, 189, 248, 0.1);
  padding: 0.2rem 0.55rem;
  border-radius: 9999px;
  border: 1px solid rgba(56, 189, 248, 0.2);
}

.lr-svg-wrapper {
  position: relative;
  width: 100%;
  user-select: none;
  border-radius: var(--radius-md);
  background: radial-gradient(circle at 50% 50%, rgba(24, 32, 51, 0.6) 0%, rgba(10, 14, 24, 0.95) 100%);
  border: 1px solid rgba(255, 255, 255, 0.05);
  overflow: hidden;
  cursor: crosshair;
}

.lr-svg-wrapper svg {
  display: block;
  width: 100%;
  height: auto;
}

.lr-chart-footer-note {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.65rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.lr-chart-legend {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

.lr-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.lr-legend-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.lr-legend-line {
  width: 16px;
  height: 3px;
  border-radius: 2px;
  display: inline-block;
}

.lr-sidebar-column {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

/* Metrics Cards */
.lr-metrics-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.lr-metric-card {
  background: rgba(17, 23, 38, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  position: relative;
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.lr-metric-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-active);
}

.lr-metric-card.full-width {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.7), rgba(15, 23, 42, 0.9));
  border-color: rgba(56, 189, 248, 0.3);
}

.lr-metric-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.lr-metric-val {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

.lr-metric-val.equation {
  font-size: 1.15rem;
  color: #38bdf8;
  word-break: break-word;
}

.lr-metric-val.highlight-green {
  color: #10b981;
}

.lr-metric-val.highlight-amber {
  color: #f59e0b;
}

.lr-metric-desc {
  font-size: 0.74rem;
  color: var(--text-muted);
}

/* Prediction Calculator Box */
.lr-predict-card {
  background: rgba(17, 23, 38, 0.85);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: var(--radius-md);
  padding: 1rem 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.lr-predict-header {
  font-size: 0.88rem;
  font-weight: 700;
  color: #a5b4fc;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.lr-predict-form {
  display: flex;
  gap: 0.5rem;
}

.lr-predict-input {
  flex: 1;
  background: #090d16;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
}

.lr-predict-input:focus {
  outline: none;
  border-color: var(--accent-cyan);
}

.lr-predict-result-box {
  background: rgba(99, 102, 241, 0.1);
  border: 1px dashed rgba(99, 102, 241, 0.35);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
  font-size: 0.82rem;
  color: #c7d2fe;
}

/* Data Table and Add Point Bar */
.lr-data-management-card {
  background: rgba(17, 23, 38, 0.85);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.lr-add-form {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.lr-add-input-group {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex: 1;
  min-width: 90px;
}

.lr-add-input-group label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-muted);
}

.lr-add-input {
  width: 100%;
  background: #090d16;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-main);
  padding: 0.4rem 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
}

.lr-table-scroll {
  max-height: 180px;
  overflow-y: auto;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background: #090d16;
}

.lr-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  text-align: left;
}

.lr-table th {
  background: rgba(255, 255, 255, 0.04);
  padding: 0.45rem 0.6rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
  z-index: 1;
}

.lr-table td {
  padding: 0.35rem 0.6rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
  color: var(--text-main);
}

.lr-table tr:hover {
  background: rgba(255, 255, 255, 0.03);
}

.lr-del-btn {
  background: transparent;
  border: none;
  color: #f87171;
  cursor: pointer;
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-size: 0.85rem;
}

.lr-del-btn:hover {
  background: rgba(239, 68, 68, 0.2);
}

/* Light Theme Overrides for Linear Regression */
body.light-theme .lr-visualizer-panel {
  background: #ffffff;
  border-color: #e2e8f0;
}

body.light-theme .lr-chart-card {
  background: #f8fafc;
  border-color: #e2e8f0;
  box-shadow: none;
}

body.light-theme .lr-svg-wrapper {
  background: #ffffff;
  border-color: #e2e8f0;
}

body.light-theme .lr-metric-card {
  background: #ffffff;
  border-color: #e2e8f0;
}

body.light-theme .lr-metric-card.full-width {
  background: #f1f5f9;
  border-color: #cbd5e1;
}

body.light-theme .lr-predict-card,
body.light-theme .lr-data-management-card {
  background: #ffffff;
  border-color: #e2e8f0;
}

body.light-theme .lr-predict-input,
body.light-theme .lr-add-input,
body.light-theme .lr-table-scroll {
  background: #f8fafc;
  border-color: #cbd5e1;
  color: #0f172a;
}

body.light-theme .lr-table th {
  background: #f1f5f9;
  color: #475569;
}

body.light-theme .lr-table td {
  color: #1e293b;
  border-bottom-color: #f1f5f9;
}

/* Mobile Optimizations for Video Cards & Linear Regression */
@media (max-width: 640px) {
  .lr-visualizer-panel {
    padding: 1rem 0.65rem;
    border-radius: var(--radius-md);
  }

  .lr-chart-card {
    padding: 0.75rem 0.5rem;
  }

  .lr-chart-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .lr-chart-footer-note {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .lr-chart-footer-note > div {
    display: flex;
    gap: 0.4rem;
    width: 100%;
  }

  .lr-chart-footer-note > div .btn {
    flex: 1;
    justify-content: center;
  }

  .video-card-header {
    flex-direction: column;
    align-items: flex-start;
    padding: 0.85rem 1rem;
    gap: 0.75rem;
  }

  .video-external-btn {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .lr-metrics-grid {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .lr-metric-val {
    font-size: 1.1rem;
  }

  .lr-predict-form {
    flex-direction: column;
  }

  .lr-predict-form .btn {
    width: 100%;
    justify-content: center;
  }

  .lr-add-form {
    flex-direction: column;
    align-items: stretch;
  }

  .lr-add-form .btn {
    width: 100%;
    justify-content: center;
  }
}