/* ========================================
   CSS Variables & Root Styles
   ======================================== */
:root {
  /* Light Theme Colors */
  --primary-color: #4caf50;
  --primary-dark: #388e3c;
  --primary-light: #81c784;
  --secondary-color: #2196f3;
  --secondary-dark: #1976d2;
  --accent-color: #ff6b6b;
  --accent-dark: #e74c3c;

  /* Background Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f5f7fa;
  --bg-tertiary: #e8edf2;
  --bg-card: #ffffff;
  --bg-code: #f8f9fa;

  /* Text Colors */
  --text-primary: #2c3e50;
  --text-secondary: #546e7a;
  --text-tertiary: #78909c;
  --text-inverse: #ffffff;

  /* Border Colors */
  --border-color: #e0e0e0;
  --border-light: #f0f0f0;

  /* Shadow */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.15);
  --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.2);

  /* Typography */
  --font-primary:
    -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu",
    "Cantarell", sans-serif;
  --font-mono:
    "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 250ms ease-in-out;
  --transition-slow: 400ms ease-in-out;
}

/* Dark Theme */
[data-theme="dark"] {
  --primary-color: #66bb6a;
  --primary-dark: #4caf50;
  --primary-light: #81c784;
  --secondary-color: #42a5f5;
  --secondary-dark: #2196f3;
  --accent-color: #ff7979;
  --accent-dark: #ff6b6b;

  --bg-primary: #121212;
  --bg-secondary: #1e1e1e;
  --bg-tertiary: #2a2a2a;
  --bg-card: #1e1e1e;
  --bg-code: #0d1117;

  --text-primary: #e0e0e0;
  --text-secondary: #b0b0b0;
  --text-tertiary: #808080;
  --text-inverse: #121212;

  --border-color: #333333;
  --border-light: #2a2a2a;

  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 12px 24px rgba(0, 0, 0, 0.6);
}

/* ========================================
   Base Styles
   ======================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition:
    background-color var(--transition-normal),
    color var(--transition-normal);
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

a {
  color: var(--secondary-color);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--secondary-dark);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

code {
  font-family: var(--font-mono);
  background-color: var(--bg-code);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
}

kbd {
  background-color: var(--bg-tertiary);
  padding: 0.2em 0.5em;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  font-family: var(--font-mono);
  font-size: 0.85em;
}

/* ========================================
   Navigation Bar - Enhanced
   ======================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  z-index: 1000;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] .navbar {
  background: rgba(18, 18, 18, 0.98);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.navbar.scrolled {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .navbar.scrolled {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.navbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem var(--spacing-md);
  max-width: 1400px;
  gap: 1rem;
}

.nav-center {
  display: flex;
  justify-content: center;
  flex: 1;
}

.nav-brand {
  display: flex;
  align-items: center;
  cursor: pointer;
  transition: transform 0.2s ease;
}

.nav-brand:hover {
  transform: scale(1.02);
}

.brand-name {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(
    135deg,
    var(--primary-color) 0%,
    var(--secondary-color) 50%,
    var(--accent-color) 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  background-size: 200% 200%;
  animation: gradient-flow 3s ease infinite;
}

@keyframes gradient-flow {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 0.25rem;
  align-items: center;
  padding: 0;
  margin: 0;
}

.nav-links li {
  margin: 0;
}

.nav-links a {
  position: relative;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.875rem;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  overflow: hidden;
}

.nav-links a::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
  opacity: 0;
  transition: opacity 0.2s ease;
  border-radius: 8px;
}

.nav-links a:hover {
  color: var(--text-inverse);
  transform: translateY(-1px);
}

.nav-links a:hover::before {
  opacity: 1;
}

.nav-links a span {
  position: relative;
  z-index: 1;
}

.nav-links a.active {
  color: var(--text-inverse);
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
  box-shadow: 0 2px 8px rgba(76, 175, 80, 0.3);
}

.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  background: var(--text-inverse);
  border-radius: 50%;
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.8);
}

.theme-toggle {
  position: relative;
  background: transparent;
  border: 2px solid var(--border-color);
  padding: 0.5rem;
  border-radius: 12px;
  cursor: pointer;
  font-size: 1.1rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-left: auto;
  overflow: hidden;
}

.theme-toggle::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
  transform: translate(-50%, -50%);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.theme-toggle:hover::before {
  width: 100%;
  height: 100%;
}

.theme-toggle:hover {
  border-color: var(--primary-color);
  transform: scale(1.05);
}

.theme-toggle:active {
  transform: scale(0.95);
}

.theme-icon {
  position: relative;
  z-index: 1;
  display: inline-block;
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.hamburger-menu {
  display: none;
  background: transparent;
  border: 2px solid var(--border-color);
  padding: 0.5rem;
  border-radius: 12px;
  cursor: pointer;
  font-size: 1.1rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  flex-direction: column;
  gap: 5px;
}

.hamburger-menu span {
  width: 20px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.hamburger-menu.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger-menu.active span:nth-child(2) {
  opacity: 0;
}

.hamburger-menu.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.hamburger-menu:hover {
  border-color: var(--primary-color);
  transform: scale(1.05);
}

.theme-toggle:hover .theme-icon {
  transform: rotate(20deg) scale(1.1);
}

/* ========================================
   Scroll Progress Bar
   ======================================== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--primary-color),
    var(--secondary-color),
    var(--accent-color)
  );
  z-index: 9999;
  transition: width 0.1s ease-out;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  will-change: width;
}

[data-theme="dark"] .scroll-progress {
  box-shadow: 0 2px 8px rgba(76, 175, 80, 0.3);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 60px;
  overflow: hidden;
  background: linear-gradient(
    135deg,
    var(--bg-primary) 0%,
    var(--bg-secondary) 100%
  );
}

.hero-particles {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    radial-gradient(
      circle at 20% 30%,
      var(--primary-color) 1px,
      transparent 1px
    ),
    radial-gradient(
      circle at 80% 70%,
      var(--secondary-color) 1px,
      transparent 1px
    ),
    radial-gradient(circle at 40% 80%, var(--accent-color) 1px, transparent 1px);
  background-size:
    50px 50px,
    80px 80px,
    60px 60px;
  opacity: 0.1;
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0px);
  }
  50% {
    transform: translateY(-20px);
  }
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 900px;
}

.hero-title {
  font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  line-height: 1.1;
}

.gradient-text {
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color),
    var(--accent-color)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-shift 3s ease infinite;
  background-size: 200% 200%;
}

@keyframes gradient-shift {
  0%,
  100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

.hero-subtitle {
  font-size: clamp(1.2rem, 3vw, 1.8rem);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

.hero-description {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-number {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-tertiary);
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  transition: all var(--transition-normal);
  cursor: pointer;
  border: 2px solid transparent;
}

.btn-primary {
  background-color: var(--primary-color);
  color: var(--text-inverse);
}

.btn-primary:hover {
  background-color: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border-color: var(--border-color);
}

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

.github-icon {
  width: 20px;
  height: 20px;
}

/* ========================================
   Section Styles
   ======================================== */
.section {
  padding: calc(var(--spacing-xl) + 20px) 0 var(--spacing-xl);
  margin-top: 0;
  scroll-margin-top: 60px;
}

.section-alt {
  background-color: var(--bg-secondary);
}

.section-title {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--text-primary);
}

.subsection-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  margin: var(--spacing-lg) 0 var(--spacing-md);
  color: var(--text-primary);
}

.section-intro {
  max-width: 800px;
  margin: 0 auto var(--spacing-xl);
  text-align: center;
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ========================================
   Overview Section
   ======================================== */
.overview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.overview-card {
  background-color: var(--bg-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  border: 1px solid var(--border-light);
}

.overview-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.card-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
}

.overview-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.overview-card p {
  color: var(--text-secondary);
  line-height: 1.6;
}

.branding-section {
  background-color: var(--bg-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--primary-color);
  box-shadow: var(--shadow-sm);
}

.branding-section p {
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ========================================
   Features Section
   ======================================== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.feature-card {
  background-color: var(--bg-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  border: 1px solid var(--border-light);
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-color);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.feature-list {
  list-style: none;
  padding: 0;
}

.feature-list li {
  padding: var(--spacing-xs) 0;
  color: var(--text-secondary);
  position: relative;
  padding-left: var(--spacing-md);
}

.feature-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--primary-color);
  font-weight: bold;
}

/* ========================================
   Architecture Section
   ======================================== */
.architecture-intro {
  max-width: 800px;
  margin: 0 auto var(--spacing-xl);
  text-align: center;
  color: var(--text-secondary);
  font-size: 1.1rem;
  line-height: 1.8;
}

.mermaid-container {
  background-color: var(--bg-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
  overflow-x: auto;
}

.mermaid {
  display: flex;
  justify-content: center;
  min-height: 400px;
}

.architecture-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.arch-card {
  background-color: var(--bg-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.arch-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.file-structure {
  background-color: var(--bg-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow-x: auto;
}

.file-structure pre {
  margin-top: var(--spacing-md);
  background-color: var(--bg-code);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
}

.file-structure code {
  color: var(--text-secondary);
  line-height: 1.8;
  font-size: 0.9rem;
}

/* ========================================
   Screenshots Gallery
   ======================================== */
.platform-section {
  margin-bottom: var(--spacing-xl);
}

.platform-icon {
  font-size: 1.5rem;
  margin-right: var(--spacing-xs);
}

.screenshot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.web-grid {
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

.screenshot-item {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.screenshot-item:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.screenshot-item img {
  width: 100%;
  height: auto;
  display: block;
}

.screenshot-caption {
  padding: var(--spacing-sm);
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.demo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-md);
}

.demo-item {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.demo-item-full {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  margin-top: var(--spacing-lg);
}

.demo-item img,
.demo-item-full img {
  width: 100%;
  height: auto;
  display: block;
}

.gallery-note {
  background-color: var(--bg-card);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--accent-color);
  margin-top: var(--spacing-xl);
}

.gallery-note p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========================================
   Tech Stack Section
   ======================================== */
.tech-category {
  margin-bottom: var(--spacing-xl);
}

.tech-category-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
  font-weight: 600;
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.tech-badge {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 0.5rem;
  min-height: 50px;
}

.tech-badge img {
  width: auto;
  height: 28px;
  max-width: 140px;
  object-fit: contain;
  transition: transform 0.2s ease;
}

.tech-badge:hover img {
  transform: scale(1.05);
}

.tech-details {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.tech-detail-card {
  background-color: var(--bg-card);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
}

.tech-detail-card h4 {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-sm);
  color: var(--primary-color);
}

.tech-detail-card p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ========================================
   Installation Section
   ======================================== */
.install-steps {
  max-width: 900px;
  margin: 0 auto;
}

.install-step {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
  background-color: var(--bg-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.step-number {
  flex-shrink: 0;
  width: 50px;
  height: 50px;
  background: linear-gradient(
    135deg,
    var(--primary-color),
    var(--secondary-color)
  );
  color: var(--text-inverse);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  font-weight: 700;
}

.step-content {
  flex: 1;
}

.step-content h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.step-content ul {
  margin: var(--spacing-sm) 0;
  padding-left: var(--spacing-md);
  color: var(--text-secondary);
}

.step-content li {
  margin-bottom: var(--spacing-xs);
}

.code-block {
  background-color: var(--bg-code);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: var(--spacing-md) 0;
}

.code-block pre {
  margin: 0;
  padding: var(--spacing-md);
  overflow-x: auto;
}

.code-block code {
  background-color: transparent;
  padding: 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

.step-note {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.install-notes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.note-card {
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.note-card h4 {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-sm);
}

.note-tip {
  background-color: var(--bg-card);
  border-left: 4px solid var(--primary-color);
}

.note-warning {
  background-color: var(--bg-card);
  border-left: 4px solid var(--accent-color);
}

.note-card ul {
  margin-top: var(--spacing-sm);
  padding-left: var(--spacing-md);
  color: var(--text-secondary);
}

/* ========================================
   Documentation Section
   ======================================== */
.doc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.doc-card {
  background-color: var(--bg-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border-light);
}

.doc-card h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.doc-card ul {
  list-style: none;
  padding: 0;
}

.doc-card li {
  padding: var(--spacing-xs) 0;
  color: var(--text-secondary);
  line-height: 1.6;
}

.doc-card p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-top: var(--spacing-sm);
}

.schema-table {
  margin-top: var(--spacing-md);
}

.schema-table h4 {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-sm);
  color: var(--primary-color);
}

.schema-table table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--spacing-sm);
}

.schema-table th,
.schema-table td {
  padding: var(--spacing-xs) var(--spacing-sm);
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.schema-table th {
  background-color: var(--bg-secondary);
  font-weight: 600;
  color: var(--text-primary);
}

.schema-table td {
  color: var(--text-secondary);
}

.api-section {
  margin-top: var(--spacing-xl);
}

.scripts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.script-item {
  background-color: var(--bg-card);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-light);
  transition: all var(--transition-fast);
}

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

.script-item code {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-size: 1rem;
  color: var(--primary-color);
}

.script-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin: 0;
}

/* ========================================
   Contact Section
   ======================================== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.contact-card {
  background-color: var(--bg-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  text-align: center;
  transition: all var(--transition-normal);
}

.contact-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
}

.contact-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
  color: var(--primary-color);
}

.contact-card h3 {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.contact-name {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.contact-link {
  color: var(--secondary-color);
  font-weight: 500;
}

.contact-link:hover {
  color: var(--secondary-dark);
  text-decoration: underline;
}

.contribute-section {
  background-color: var(--bg-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
}

.contribute-section h3 {
  font-size: 1.8rem;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.contribute-section p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--spacing-sm);
}

.contribute-section ul {
  padding-left: var(--spacing-lg);
  color: var(--text-secondary);
}

.contribute-section li {
  margin-bottom: var(--spacing-xs);
  line-height: 1.6;
}

.license-section {
  background-color: var(--bg-card);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border-left: 4px solid var(--primary-color);
}

.license-section h3 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.license-section p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--spacing-sm);
}

.license-notice {
  margin-top: var(--spacing-md);
  padding: var(--spacing-sm);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
}

/* ========================================
   Footer
   ======================================== */
.footer {
  background-color: var(--bg-card);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-xl) 0 var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-logo {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
}

.footer-brand-name {
  font-size: 2rem;
  font-weight: 800;
  margin: 0;
  letter-spacing: -0.5px;
  line-height: 1.2;
}

.footer-tagline {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.footer-column h4 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.footer-column ul {
  list-style: none;
  padding: 0;
}

.footer-column li {
  margin-bottom: var(--spacing-xs);
}

.footer-column a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-column a:hover {
  color: var(--primary-color);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-light);
}

.footer-bottom p {
  color: var(--text-tertiary);
  font-size: 0.9rem;
  margin-bottom: var(--spacing-xs);
}

.footer-note {
  font-style: italic;
}

/* ========================================
   Back to Top Button
   ======================================== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background-color: var(--primary-color);
  color: var(--text-inverse);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-normal);
  z-index: 999;
}

.back-to-top:hover {
  background-color: var(--primary-dark);
  transform: translateY(-5px);
}

.back-to-top.visible {
  display: flex;
}

.back-to-top svg {
  width: 24px;
  height: 24px;
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
  .navbar .container {
    padding: 0.6rem var(--spacing-md);
  }

  .nav-links {
    gap: 0.15rem;
  }

  .nav-links a {
    padding: 0.4rem 0.7rem;
    font-size: 0.8rem;
  }

  .brand-name {
    font-size: 1.1rem;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }

  .footer-links {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  html {
    font-size: 14px;
  }

  .navbar .container {
    flex-wrap: nowrap;
    padding: 0.5rem var(--spacing-sm);
    position: relative;
  }

  .nav-brand {
    flex: 0 0 auto;
  }

  .brand-name {
    font-size: 1.5rem;
  }

  .nav-center {
    position: fixed;
    top: 58px;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    box-shadow: var(--shadow-lg);
    border-top: 1px solid var(--border-color);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-in-out;
    z-index: 998;
  }

  .nav-center.active {
    max-height: 500px;
  }

  .nav-links {
    flex-direction: column;
    gap: 0;
    width: 100%;
    padding: 0;
  }

  .nav-links li {
    width: 100%;
    border-bottom: 1px solid var(--border-light);
  }

  .nav-links li:last-child {
    border-bottom: none;
  }

  .nav-links a {
    font-size: 0.95rem;
    padding: 1rem 1.25rem;
    width: 100%;
    text-align: left;
    border-radius: 0;
    display: block;
  }

  .hamburger-menu {
    display: flex;
    margin-left: auto;
    flex-shrink: 0;
  }

  .theme-toggle {
    width: 50px;
    height: 50px;
    font-size: 1.2rem;
    margin-left: 0.5rem;
    flex-shrink: 0;
  }

  .hero {
    min-height: auto;
    padding: calc(var(--spacing-xl) + 80px) 0 var(--spacing-xl);
  }

  .hero-stats {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .hero-buttons {
    flex-direction: column;
    width: 100%;
    max-width: 300px;
    margin: 0 auto;
  }

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

  .overview-grid,
  .features-grid,
  .tech-grid {
    grid-template-columns: 1fr;
  }

  .screenshot-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .demo-grid {
    grid-template-columns: 1fr;
  }

  .architecture-details {
    grid-template-columns: 1fr;
  }

  .install-step {
    flex-direction: column;
  }

  .footer-links {
    grid-template-columns: 1fr;
  }

  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-sm);
  }

  .nav-links {
    font-size: 0.8rem;
  }

  .screenshot-grid {
    grid-template-columns: 1fr;
  }

  .tech-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: var(--spacing-lg) 0;
  }
}

/* ========================================
   Utility Classes
   ======================================== */
.text-center {
  text-align: center;
}

.mt-1 {
  margin-top: var(--spacing-xs);
}
.mt-2 {
  margin-top: var(--spacing-sm);
}
.mt-3 {
  margin-top: var(--spacing-md);
}
.mt-4 {
  margin-top: var(--spacing-lg);
}

.mb-1 {
  margin-bottom: var(--spacing-xs);
}
.mb-2 {
  margin-bottom: var(--spacing-sm);
}
.mb-3 {
  margin-bottom: var(--spacing-md);
}
.mb-4 {
  margin-bottom: var(--spacing-lg);
}

/* ========================================
   Animations
   ======================================== */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

/* ========================================
   Print Styles
   ======================================== */
@media print {
  .navbar,
  .theme-toggle,
  .back-to-top,
  .hero-buttons {
    display: none;
  }

  body {
    background: white;
    color: black;
  }

  .section {
    page-break-inside: avoid;
  }
}