/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Cairo:wght@400;600;700&family=IBM+Plex+Sans+Arabic:wght@400;500;700&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&family=Plus+Jakarta+Sans:wght@500;700;800&display=swap');

:root {
  /* Fonts */
  --font-display: 'Plus Jakarta Sans', 'Inter', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-code: 'JetBrains Mono', monospace;

  /* Colors - Light Theme (Apple & Vercel inspired - Custom Teal-Peach Palette) */
  --bg-color: #FFF0E4; /* Soft Warm Peach */
  --surface-color: #FFFFFF;
  --surface-border: rgba(0, 121, 121, 0.12);
  --primary-color: #007979; /* Deep Teal */
  --primary-hover: #005E5E;
  --primary-glow: rgba(0, 121, 121, 0.08);
  --text-main: #1C2B2B; /* Deep slate-teal */
  --text-muted: #4B6363; /* Muted slate-teal */
  --accent-color: #24B1B1; /* Bright Teal/Cyan */
  --accent-success: #007979;

  /* Glassmorphism Details */
  --glass-bg: rgba(255, 240, 228, 0.8);
  --glass-border: rgba(0, 121, 121, 0.15);
  --glass-blur: 20px;

  /* Layout Boundaries */
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 8px;
  
  --shadow-sm: 0 2px 8px rgba(0, 121, 121, 0.02);
  --shadow-md: 0 10px 30px -10px rgba(0, 121, 121, 0.05), 0 1px 3px rgba(0, 121, 121, 0.02);
  --shadow-lg: 0 20px 40px -15px rgba(0, 121, 121, 0.08), 0 1px 5px rgba(0, 121, 121, 0.02);

  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-bezier: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark Theme Overrides (Linear & Apple Vision Pro inspired - Custom Teal-Peach Palette) */
[data-theme="dark"] {
  --bg-color: #051414; /* Obsidian Deep Teal Black */
  --surface-color: #0B2121; /* Dark Slate Teal */
  --surface-border: rgba(36, 177, 177, 0.15);
  --primary-color: #24B1B1; /* Bright Teal/Cyan */
  --primary-hover: #FFE0C5; /* Warm Peach */
  --primary-glow: rgba(36, 177, 177, 0.12);
  --text-main: #FFF0E4; /* Soft Warm Peach */
  --text-muted: #84BFBF; /* Subtle teal-gray */
  --accent-color: #FFE0C5; /* Warm Peach/Apricot */
  --accent-success: #24B1B1;

  --glass-bg: rgba(5, 20, 20, 0.8);
  --glass-border: rgba(36, 177, 177, 0.15);

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 12px 30px -10px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 30px 60px -15px rgba(0, 0, 0, 0.6);
}

/* Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  width: 100%;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: var(--font-body);
  line-height: 1.6;
  transition: background-color var(--transition-normal), color var(--transition-normal), border-color var(--transition-normal);
  overflow-x: hidden;
  width: 100%;
  position: relative;
}

/* Developer Dotted Grid Overlay */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: radial-gradient(var(--surface-border) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.4;
  pointer-events: none;
  z-index: -3;
}

/* Decorative Background Glows */
.mesh-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: -2;
  opacity: 0.15;
  transition: opacity var(--transition-normal);
}
[data-theme="dark"] .mesh-glow {
  opacity: 0.12;
}
.mesh-glow-1 {
  background: radial-gradient(circle, var(--primary-color) 0%, transparent 70%);
  top: 5%;
  left: 20%;
  animation: floatBlob1 20s infinite alternate ease-in-out;
}
.mesh-glow-2 {
  background: radial-gradient(circle, var(--accent-color) 0%, transparent 70%);
  top: 15%;
  right: 15%;
  animation: floatBlob2 25s infinite alternate ease-in-out;
}

@keyframes floatBlob1 {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(80px, 40px) scale(1.15); }
}
@keyframes floatBlob2 {
  0% { transform: translate(0, 0) scale(1.1); }
  100% { transform: translate(-60px, -30px) scale(0.9); }
}

[dir="rtl"] {
  font-family: 'IBM Plex Sans Arabic', 'Cairo', var(--font-body);
}

/* Headings */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.25;
  color: var(--text-main);
  overflow-wrap: break-word;
}

[dir="rtl"] h1, [dir="rtl"] h2, [dir="rtl"] h3, [dir="rtl"] h4 {
  font-family: 'IBM Plex Sans Arabic', 'Cairo', var(--font-display);
  letter-spacing: normal;
}

p {
  color: var(--text-muted);
}

/* Container */
.container {
  width: 100%;
  max-width: 1100px;
  margin-inline: auto;
  padding-inline: 24px;
}

@media (max-width: 576px) {
  .container {
    padding-inline: 16px;
  }
}

/* Floating Navigation Bar */
.header-glass {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: calc(100% - 32px);
  max-width: 1100px;
  height: 60px;
  z-index: 1000;
  background-color: var(--glass-bg);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding-inline: 24px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-main);
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.nav-brand:hover {
  opacity: 0.85;
}

.nav-brand svg {
  color: var(--primary-color);
  transition: transform var(--transition-normal);
}

.nav-brand:hover svg {
  transform: rotate(90deg);
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Utility buttons */
.btn-control {
  background: transparent;
  border: 1px solid var(--surface-border);
  color: var(--text-main);
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all var(--transition-fast);
}

.btn-control:hover {
  background-color: var(--surface-color);
  border-color: var(--primary-color);
  box-shadow: 0 4px 12px var(--primary-glow);
  transform: translateY(-1px);
}

.btn-control svg {
  transition: transform var(--transition-fast);
}

.btn-control:hover svg {
  transform: scale(1.1);
}

/* Button UI */
.btn-primary {
  background-color: var(--primary-color);
  color: #FFFFFF !important;
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  gap: 8px;
  box-shadow: 0 4px 20px var(--primary-glow);
  transition: all var(--transition-normal);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--primary-glow);
}

.btn-secondary {
  background-color: var(--surface-color);
  color: var(--text-main) !important;
  border: 1px solid var(--surface-border);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  gap: 8px;
  transition: all var(--transition-normal);
}

.btn-secondary:hover {
  background-color: var(--bg-color);
  border-color: var(--text-muted);
  transform: translateY(-2px);
}

/* Section Spacing */
.section-padding {
  padding-block: 100px;
}

.section-header {
  max-width: 800px;
  margin-bottom: 60px;
  text-align: start;
}

.section-header h2 {
  font-size: 2.75rem;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  font-weight: 800;
}

.section-header p {
  color: var(--text-muted);
  font-size: 1.15rem;
  line-height: 1.6;
}

/* Case Study Badge */
.badge-cs50 {
  display: inline-flex;
  align-items: center;
  background-color: var(--primary-glow);
  color: var(--primary-color);
  padding: 6px 16px;
  border-radius: 999px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.8rem;
  margin-bottom: 24px;
  border: 1px solid var(--glass-border);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

[data-theme="dark"] .badge-cs50 {
  border-color: rgba(36, 177, 177, 0.15);
}

/* Hero Section */
.hero {
  position: relative;
  padding-top: 180px;
  padding-bottom: 100px;
  text-align: center;
  overflow: hidden;
}

.hero-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 900px;
  margin-inline: auto;
}

.hero-layout h1 {
  font-size: clamp(1.75rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.04em;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--text-main) 40%, var(--primary-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-layout p {
  font-size: clamp(1rem, 2vw, 1.25rem);
  line-height: 1.625;
  color: var(--text-muted);
  max-width: 720px;
  margin-bottom: 36px;
  margin-inline: auto;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
}

/* Overview Section */
.overview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.overview-card {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  padding: 40px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.overview-card:hover {
  transform: translateY(-6px) scale(1.005);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-hover);
  background: radial-gradient(circle at top left, rgba(255,255,255,0.03), transparent), var(--surface-color);
}

.overview-card h3 {
  font-size: 1.5rem;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.overview-card h3 svg {
  color: var(--primary-color);
}

.overview-card p {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-muted);
}

/* Before / After Showcase Section */
.slider-wrapper {
  max-width: 950px;
  margin-inline: auto;
}

.slider-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--surface-border);
  user-select: none;
}

.slider-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 45%;
  background: linear-gradient(to bottom, rgba(255, 255, 255, 0.08), transparent);
  pointer-events: none;
  z-index: 5;
}

.slider-image {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  pointer-events: none;
}

.slider-image.image-stego {
  z-index: 2;
  clip-path: inset(0 0 0 calc(var(--slide-pos, 0.5) * 100%));
}

.slider-handle {
  position: absolute;
  top: 0;
  bottom: 0;
  left: calc(var(--slide-pos, 0.5) * 100%);
  width: 2px;
  background-color: rgba(255, 255, 255, 0.9);
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.6);
  z-index: 10;
  cursor: ew-resize;
  transform: translateX(-50%);
}

.slider-handle-button {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 48px;
  height: 48px;
  background-color: var(--primary-color);
  color: #FFFFFF;
  border: 2px solid #FFFFFF;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
  cursor: ew-resize;
  transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.slider-handle:hover .slider-handle-button {
  transform: translate(-50%, -50%) scale(1.1);
  background-color: var(--primary-hover);
}

.slider-label {
  position: absolute;
  bottom: 24px;
  background-color: rgba(15, 23, 42, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #FFFFFF;
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  z-index: 5;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.label-original {
  inset-inline-start: 24px;
}

.label-stego {
  inset-inline-end: 24px;
}

/* Showcase Grid Layout */
.showcase-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 32px;
  margin-top: 40px;
}

@media (max-width: 992px) {
  .showcase-grid {
    grid-template-columns: 1fr;
  }
}

.examiner-card {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all var(--transition-normal);
}

.examiner-card:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-lg);
}

.examiner-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
}

.examiner-header svg {
  color: var(--primary-color);
}

.examiner-header h3 {
  font-size: 1.35rem;
}

.examiner-grid-visual {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  margin-block: 24px;
}

.examiner-pixel {
  background-color: var(--bg-color);
  border: 1px solid var(--surface-border);
  padding: 16px 12px;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 85px;
  transition: all var(--transition-fast);
}

.examiner-pixel:hover {
  border-color: var(--accent-color);
  background-color: var(--surface-color);
  transform: translateY(-2px);
}

.examiner-pixel span {
  font-family: var(--font-code);
  font-weight: 700;
  font-size: 0.95rem;
}

.examiner-pixel small {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Timeline / Process Flow */
.timeline-container {
  position: relative;
  max-width: 850px;
  margin-inline: auto;
}

.timeline-line {
  position: absolute;
  top: 0;
  bottom: 0;
  inset-inline-start: 32px;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary-color) 0%, var(--surface-border) 100%);
}

.timeline-item {
  position: relative;
  margin-bottom: 48px;
  padding-inline-start: 80px;
}

.timeline-item:last-child {
  margin-bottom: 0;
}

.timeline-dot {
  position: absolute;
  inset-inline-start: 16px;
  top: 4px;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--surface-color);
  border: 2px solid var(--primary-color);
  box-shadow: 0 0 12px var(--primary-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--primary-color);
  z-index: 5;
  transition: all var(--transition-normal);
}

.timeline-item:hover .timeline-dot {
  background-color: var(--primary-color);
  color: #FFFFFF;
  transform: scale(1.1);
  box-shadow: 0 0 20px var(--primary-color);
}

.timeline-card {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  padding: 32px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.timeline-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.timeline-card h3 {
  font-size: 1.35rem;
  margin-bottom: 12px;
}

.timeline-card p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.6;
}

/* Security Breakdown */
.security-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.security-card {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  padding: 36px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.security-card:hover {
  transform: translateY(-6px) scale(1.005);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.security-card h3 {
  font-size: 1.35rem;
  margin-bottom: 12px;
  color: var(--text-main);
}

.security-card p {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-muted);
}

/* Technical Architecture Pipeline */
.arch-container {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-lg);
  max-width: 1050px;
  margin-inline: auto;
  position: relative;
  overflow: hidden;
}

.arch-container::after {
  content: '';
  position: absolute;
  top: -20%;
  left: -20%;
  width: 50%;
  height: 50%;
  background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
  pointer-events: none;
  filter: blur(50px);
}

.arch-toggle {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 40px;
}

.arch-flow {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-block: 40px;
  padding-block: 24px;
}

@media (max-width: 992px) {
  .arch-flow {
    flex-direction: column;
    gap: 24px;
  }
}

.arch-node {
  background-color: var(--bg-color);
  border: 1px solid var(--surface-border);
  padding: 16px 24px;
  border-radius: var(--radius-md);
  text-align: center;
  font-weight: 700;
  font-size: 0.9rem;
  white-space: nowrap;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  z-index: 5;
}

.arch-node.active-node {
  background-color: var(--primary-color);
  color: #FFFFFF;
  border-color: var(--primary-color);
  box-shadow: 0 0 24px var(--primary-color);
  transform: scale(1.06);
}

.arch-arrow {
  position: relative;
  flex-grow: 1;
  height: 2px;
  background-color: var(--surface-border);
  min-width: 50px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-normal);
}

.arch-arrow svg {
  position: absolute;
  right: -6px;
  top: 50%;
  transform: translateY(-50%) scale(0.85);
  color: var(--surface-border);
  transition: color var(--transition-normal);
}

[dir="rtl"] .arch-arrow svg {
  transform: translateY(-50%) scaleX(-1) scale(0.85);
  left: -6px;
  right: auto;
}

.arch-arrow::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  width: 8px;
  height: 8px;
  background-color: var(--primary-color);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  opacity: 0;
  box-shadow: 0 0 10px var(--primary-color);
  pointer-events: none;
}

.arch-arrow.pulse-active {
  background-color: var(--primary-color);
}

.arch-arrow.pulse-active::after {
  animation: arrowPulse 2s infinite linear;
  opacity: 1;
}

.arch-arrow.pulse-active svg {
  color: var(--primary-color);
}

@keyframes arrowPulse {
  0% { left: 0%; }
  100% { left: 100%; }
}

@media (max-width: 992px) {
  .arch-arrow {
    width: 2px;
    height: 40px;
    flex-grow: 0;
    min-width: 0;
  }
  .arch-arrow svg {
    left: 50%;
    right: auto;
    bottom: -10px;
    top: auto;
    transform: translateX(-50%) rotate(90deg) scale(0.85) !important;
  }
  [dir="rtl"] .arch-arrow svg {
    transform: translateX(-50%) rotate(90deg) scale(0.85) !important;
    left: 50%;
    right: auto;
  }
  .arch-arrow::after {
    left: 50%;
    top: 0;
  }
  @keyframes arrowPulse {
    0% { top: 0%; }
    100% { top: 100%; }
  }
}

.arch-caption-box {
  background-color: var(--bg-color);
  padding: 20px 28px;
  border-radius: var(--radius-md);
  border-inline-start: 4px solid var(--primary-color);
  text-align: start;
  box-shadow: var(--shadow-sm);
  z-index: 5;
}

.arch-caption-box p {
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Technology Stack */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 24px;
}

.tech-card {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  padding: 32px 24px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  text-align: center;
  transition: all var(--transition-normal);
}

.tech-card:hover {
  transform: translateY(-6px) scale(1.005);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.tech-icon {
  width: 56px;
  height: 56px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary-color);
  background-color: var(--primary-glow);
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  transition: all var(--transition-normal);
}

.tech-card:hover .tech-icon {
  background-color: var(--primary-color);
  color: #FFFFFF;
  transform: scale(1.1) rotate(6deg);
}

.tech-card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.tech-card p {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-muted);
}

/* IDE Code Explorer */
.code-explorer {
  background-color: #05070B; /* Slate Black */
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: grid;
  grid-template-columns: 260px 1fr;
  height: 520px;
  max-width: 1050px;
  margin-inline: auto;
  box-shadow: var(--shadow-lg);
}

.explorer-sidebar {
  background-color: #030406;
  border-inline-end: 1px solid rgba(255, 255, 255, 0.08);
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.explorer-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #52607A;
}

.explorer-file-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.explorer-file-btn {
  background: transparent;
  border: none;
  color: #7A8AA6;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  text-align: start;
  font-family: var(--font-code);
  font-size: 0.825rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: all var(--transition-fast);
}

.explorer-file-btn:hover {
  background-color: rgba(255, 255, 255, 0.04);
  color: #FFFFFF;
}

.explorer-file-btn.active-file {
  background-color: var(--primary-glow);
  color: var(--primary-color);
  font-weight: 600;
  border-inline-start: 3px solid var(--primary-color);
}

.explorer-content {
  padding: 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background-color: #05070B;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 16px;
  margin-bottom: 20px;
}

.code-title {
  font-family: var(--font-code);
  font-weight: 700;
  color: #FFFFFF;
  font-size: 0.95rem;
}

.code-tag {
  background-color: var(--primary-glow);
  color: var(--primary-color);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.725rem;
  font-family: var(--font-code);
  font-weight: 600;
}

.code-view {
  flex-grow: 1;
  overflow-y: auto;
  font-family: var(--font-code);
  font-size: 0.85rem;
  line-height: 1.6;
  color: #94A3B8;
  margin-bottom: 20px;
  max-height: 280px;
  text-align: start;
  direction: ltr;
}

.code-keyword { color: #F472B6; font-weight: 600; }
.code-function { color: #24B1B1; }
.code-string { color: #FFE0C5; }
.code-comment { color: #64748B; font-style: italic; }

.file-desc-box {
  background-color: #030406;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: #7A8AA6;
  text-align: start;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-inline-start: 4px solid var(--primary-color);
}

/* Challenges & Solutions */
.challenges-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.challenge-card {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 24px;
  transition: all var(--transition-normal);
}

.challenge-card:hover {
  transform: translateY(-6px) scale(1.005);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.challenge-block h3 {
  font-size: 1.3rem;
  margin-bottom: 8px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.challenge-block p {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-muted);
}

.challenge-badge-red {
  display: inline-flex;
  align-items: center;
  background-color: rgba(239, 68, 68, 0.08);
  color: #F87171;
  border: 1px solid rgba(239, 68, 68, 0.15);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.725rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.challenge-badge-green {
  display: inline-flex;
  align-items: center;
  background-color: var(--primary-glow);
  color: var(--primary-color);
  border: 1px solid rgba(36, 177, 177, 0.15);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.725rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* Lessons Learned */
.lessons-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.lesson-card {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  padding: 32px 24px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.lesson-card:hover {
  transform: translateY(-6px) scale(1.005);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.lesson-card h4 {
  font-size: 1.15rem;
  margin-bottom: 10px;
  color: var(--text-main);
}

.lesson-card p {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--text-muted);
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* GitHub Call To Action Card */
.github-card {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  max-width: 800px;
  margin-inline: auto;
  position: relative;
  overflow: hidden;
  transition: all var(--transition-normal);
}

.github-card::before {
  content: '';
  position: absolute;
  bottom: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 60%;
  height: 60%;
  background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
  pointer-events: none;
  filter: blur(40px);
}

.github-card h2 {
  font-size: 2.25rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.github-card p {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin-bottom: 32px;
  max-width: 550px;
  margin-inline: auto;
}

/* Footer Section */
.footer {
  border-top: 1px solid var(--surface-border);
  padding-block: 40px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Progressive Reveal Animations */
.fade-up-reveal {
  opacity: 1;
  transform: none;
}

.js-enabled .fade-up-reveal {
  opacity: 0;
  transform: translateY(40px) scale(0.98);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.js-enabled .fade-up-reveal.reveal-active {
  opacity: 1;
  transform: translateY(0) scale(1);
}

/* Stagger card reveals under reveal-active parents */
.fade-up-reveal .overview-card,
.fade-up-reveal .security-card,
.fade-up-reveal .tech-card,
.fade-up-reveal .lesson-card,
.fade-up-reveal .challenge-card,
.fade-up-reveal .metric-card {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s var(--transition-bezier), transform 0.8s var(--transition-bezier), border-color var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.fade-up-reveal.reveal-active .overview-card,
.fade-up-reveal.reveal-active .security-card,
.fade-up-reveal.reveal-active .tech-card,
.fade-up-reveal.reveal-active .lesson-card,
.fade-up-reveal.reveal-active .challenge-card,
.fade-up-reveal.reveal-active .metric-card {
  opacity: 1;
  transform: translateY(0);
}

.fade-up-reveal.reveal-active .overview-card:nth-child(1),
.fade-up-reveal.reveal-active .security-card:nth-child(1),
.fade-up-reveal.reveal-active .tech-card:nth-child(1),
.fade-up-reveal.reveal-active .lesson-card:nth-child(1),
.fade-up-reveal.reveal-active .challenge-card:nth-child(1),
.fade-up-reveal.reveal-active .metric-card:nth-child(1) { transition-delay: 0.05s; }

.fade-up-reveal.reveal-active .overview-card:nth-child(2),
.fade-up-reveal.reveal-active .security-card:nth-child(2),
.fade-up-reveal.reveal-active .tech-card:nth-child(2),
.fade-up-reveal.reveal-active .lesson-card:nth-child(2),
.fade-up-reveal.reveal-active .challenge-card:nth-child(2),
.fade-up-reveal.reveal-active .metric-card:nth-child(2) { transition-delay: 0.15s; }

.fade-up-reveal.reveal-active .tech-card:nth-child(3),
.fade-up-reveal.reveal-active .lesson-card:nth-child(3),
.fade-up-reveal.reveal-active .metric-card:nth-child(3) { transition-delay: 0.25s; }

.fade-up-reveal.reveal-active .tech-card:nth-child(4),
.fade-up-reveal.reveal-active .lesson-card:nth-child(4),
.fade-up-reveal.reveal-active .metric-card:nth-child(4) { transition-delay: 0.35s; }

.fade-up-reveal.reveal-active .tech-card:nth-child(5) { transition-delay: 0.45s; }

/* FAQ Accordions */
.faq-container {
  max-width: 850px;
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.faq-item {
  background-color: var(--surface-color);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.faq-item:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-sm);
}

.faq-trigger {
  width: 100%;
  background: transparent;
  border: none;
  padding: 24px 32px;
  text-align: start;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  transition: color var(--transition-fast);
}

.faq-trigger:hover {
  color: var(--primary-color);
}

[dir="rtl"] .faq-trigger {
  font-family: 'IBM Plex Sans Arabic', 'Cairo', var(--font-display);
}

.faq-trigger svg {
  color: var(--text-muted);
  transition: transform var(--transition-normal), color var(--transition-fast);
}

.faq-item.active-faq {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
}

.faq-item.active-faq .faq-trigger {
  color: var(--primary-color);
}

.faq-item.active-faq .faq-trigger svg {
  transform: rotate(180deg);
  color: var(--primary-color);
}

.faq-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal) ease-in-out;
}

.faq-item.active-faq .faq-content {
  max-height: 400px;
}

.faq-content-inner {
  padding: 0 32px 24px 32px;
}

.faq-content-inner p {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-muted);
}

/* ==========================================================================
   Responsive Breakpoints & Adjustments
   ========================================================================== */

/* Show/Hide Helpers */
.mobile-hide {
  display: inline-block;
}

@media (max-width: 576px) {
  .mobile-hide {
    display: none !important;
  }
}

/* 1. Header & Navbar Mobile Optimization */
@media (max-width: 576px) {
  .header-glass {
    top: 10px;
    width: calc(100% - 16px);
    height: 52px;
  }
  .navbar {
    padding-inline: 12px;
  }
  .nav-brand {
    font-size: 0.9rem;
    gap: 6px;
  }
  .nav-brand span {
    display: inline-block;
    max-width: 110px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .nav-controls {
    flex-shrink: 0;
    gap: 6px;
  }
  .btn-control {
    padding: 6px 8px;
    font-size: 0.7rem;
    gap: 4px;
  }
}

/* 2. Page Sections Paddings */
@media (max-width: 768px) {
  .section-padding {
    padding-block: 60px;
  }
  .section-header {
    margin-bottom: 32px;
  }
  .section-header h2 {
    font-size: 2rem;
    margin-bottom: 12px;
  }
  .section-header p {
    font-size: 1rem;
  }
}

/* 3. Hero layout components */
@media (max-width: 576px) {
  .hero {
    padding-top: 140px;
    padding-bottom: 60px;
  }
  .badge-cs50 {
    font-size: 0.75rem;
    padding: 4px 12px;
    margin-bottom: 16px;
  }
  .hero-actions {
    flex-direction: column;
    width: 100%;
    max-width: 280px;
    gap: 12px;
    margin-inline: auto;
  }
  .btn-primary, .btn-secondary {
    padding: 10px 20px;
    font-size: 0.9rem;
    justify-content: center;
  }
}

/* 4. Grids responsiveness */
@media (max-width: 850px) {
  .overview-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .overview-card {
    padding: 24px;
  }
}

@media (max-width: 768px) {
  .security-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .security-card {
    padding: 24px;
  }
  
  .challenges-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .challenge-card {
    padding: 24px;
  }
}

/* 5. Metrics highlights grid */
@media (max-width: 992px) {
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}

@media (max-width: 480px) {
  .metrics-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .metrics-grid h3 {
    font-size: 2rem !important;
  }
}

/* 6. Technology stack grid */
@media (max-width: 992px) {
  .tech-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
}
@media (max-width: 600px) {
  .tech-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 400px) {
  .tech-grid {
    grid-template-columns: 1fr;
  }
}

/* 7. Lessons grid */
@media (max-width: 992px) {
  .lessons-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }
}
@media (max-width: 480px) {
  .lessons-grid {
    grid-template-columns: 1fr;
  }
  .lesson-card {
    padding: 20px;
  }
}

/* 8. Comparison Slider mobile styling */
@media (max-width: 576px) {
  .slider-handle-button {
    width: 38px;
    height: 38px;
  }
  .slider-label {
    bottom: 12px;
    padding: 6px 10px;
    font-size: 0.7rem;
  }
  .label-original {
    inset-inline-start: 12px;
  }
  .label-stego {
    inset-inline-end: 12px;
  }
  .examiner-card {
    padding: 20px;
  }
  .examiner-header h3 {
    font-size: 1.15rem;
  }
  .examiner-grid-visual {
    gap: 4px;
  }
  .examiner-pixel {
    min-height: 70px;
    padding: 8px 4px;
  }
  .examiner-pixel span {
    font-size: 0.8rem;
  }
}

/* 9. Timeline layout mobile modifications */
@media (max-width: 576px) {
  .timeline-line {
    inset-inline-start: 16px;
  }
  .timeline-item {
    padding-inline-start: 48px;
    margin-bottom: 32px;
  }
  .timeline-dot {
    inset-inline-start: 0;
    width: 32px;
    height: 32px;
    font-size: 0.85rem;
  }
  .timeline-card {
    padding: 20px;
  }
  .timeline-card h3 {
    font-size: 1.15rem;
  }
  .timeline-card p {
    font-size: 0.9rem;
  }
}

/* 10. Code Explorer tabs mobile scroll */
@media (max-width: 768px) {
  .code-explorer {
    grid-template-columns: 1fr;
    height: auto;
  }
  .explorer-sidebar {
    padding: 16px;
    gap: 12px;
    border-inline-end: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }
  .explorer-file-list {
    flex-direction: row;
    overflow-x: auto;
    padding-bottom: 8px;
    gap: 8px;
    scrollbar-width: thin;
  }
  .explorer-file-btn {
    white-space: nowrap;
    padding: 8px 12px;
    font-size: 0.775rem;
  }
  .explorer-content {
    padding: 20px;
  }
  .code-view {
    max-height: 240px;
    overflow-x: auto;
    white-space: pre;
  }
  .file-desc-box {
    padding: 12px 16px;
    font-size: 0.8rem;
  }
}

/* 11. FAQ paddings on mobile */
@media (max-width: 576px) {
  .faq-trigger {
    padding: 16px 20px;
    font-size: 0.95rem;
  }
  .faq-content-inner {
    padding: 0 20px 16px 20px;
  }
}

/* 12. GitHub CTA card mobile scaling */
@media (max-width: 576px) {
  .github-card {
    padding: 40px 20px;
  }
  .github-card h2 {
    font-size: 1.75rem;
  }
  .github-card p {
    font-size: 0.95rem;
    margin-bottom: 24px;
  }
}

/* Accessibility & Performance optimization */
@media (prefers-reduced-motion: reduce) {
  body::before,
  .mesh-glow,
  .pulse-line::after,
  .arch-arrow::after,
  .fade-up-reveal,
  .card,
  * {
    animation: none !important;
    transition: none !important;
    transform: none !important;
  }
}