/* Global Reset & Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
}

.hidden {
  display: none !important;
}

/* Custom Design Tokens & Theme Variables */
:root {
  --primary-hue: 260; /* Indigo/Violet */
  --secondary-hue: 185; /* Cyan */
  --accent-hue: 330; /* Magenta */
  
  --primary-color: hsl(var(--primary-hue), 85%, 62%);
  --primary-glow: hsl(var(--primary-hue), 85%, 62%, 0.3);
  --secondary-color: hsl(var(--secondary-hue), 90%, 48%);
  --secondary-glow: hsl(var(--secondary-hue), 90%, 48%, 0.3);
  --accent-color: hsl(var(--accent-hue), 90%, 55%);
  
  --font-family-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-family-display: 'Outfit', sans-serif;
  --font-family-mono: 'Fira Code', monospace;
  
  --border-radius-sm: 8px;
  --border-radius-md: 16px;
  --border-radius-lg: 24px;
  --border-radius-full: 9999px;
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.35s cubic-bezier(0.25, 0.8, 0.25, 1);
  --transition-slow: 0.6s cubic-bezier(0.25, 0.8, 0.25, 1);
  
  --container-width: 1200px;
}

/* Dark Theme Variables (Default) */
html[data-theme="dark"] {
  --bg-primary: hsl(240, 20%, 8%);
  --bg-secondary: hsl(240, 16%, 12%);
  --bg-tertiary: hsl(240, 14%, 18%);
  --bg-glass: hsla(240, 16%, 10%, 0.65);
  
  --border-glass: hsla(0, 0%, 100%, 0.08);
  --border-hover: hsla(var(--primary-hue), 85%, 62%, 0.3);
  
  --text-primary: hsl(0, 0%, 96%);
  --text-secondary: hsl(240, 8%, 75%);
  --text-tertiary: hsl(240, 5%, 55%);
  
  --shadow-color: rgba(0, 0, 0, 0.5);
  --shadow-glass: 0 16px 40px 0 rgba(0, 0, 0, 0.6);
  --glow-color-1: rgba(138, 43, 226, 0.16);
  --glow-color-2: rgba(0, 206, 209, 0.12);
  
  --scrollbar-thumb: hsl(240, 10%, 25%);
  --scrollbar-track: hsl(240, 20%, 6%);
}

/* Light Theme Variables */
html[data-theme="light"] {
  --bg-primary: hsl(240, 30%, 97%);
  --bg-secondary: hsl(240, 20%, 93%);
  --bg-tertiary: hsl(240, 15%, 86%);
  --bg-glass: hsla(240, 25%, 96%, 0.7);
  
  --border-glass: hsla(240, 20%, 0%, 0.08);
  --border-hover: hsla(var(--primary-hue), 85%, 62%, 0.2);
  
  --text-primary: hsl(240, 25%, 12%);
  --text-secondary: hsl(240, 12%, 40%);
  --text-tertiary: hsl(240, 8%, 62%);
  
  --shadow-color: rgba(31, 38, 135, 0.06);
  --shadow-glass: 0 16px 40px 0 rgba(31, 38, 135, 0.08);
  --glow-color-1: rgba(138, 43, 226, 0.08);
  --glow-color-2: rgba(0, 206, 209, 0.08);
  
  --scrollbar-thumb: hsl(240, 10%, 75%);
  --scrollbar-track: hsl(240, 30%, 95%);
}

body {
  font-family: var(--font-family-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
  transition: background-color var(--transition-slow), color var(--transition-normal);
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: var(--border-radius-full);
  border: 2px solid var(--scrollbar-track);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary-color);
}

/* Background Ambient Glows */
.ambient-glow {
  position: fixed;
  width: 50vw;
  height: 50vw;
  border-radius: 50%;
  pointer-events: none;
  z-index: -2;
  filter: blur(140px);
  opacity: 0.8;
  animation: pulse-glow 15s infinite alternate;
}
.bg-glow-1 {
  top: -10%;
  left: -10%;
  background: var(--glow-color-1);
}
.bg-glow-2 {
  bottom: -10%;
  right: -10%;
  background: var(--glow-color-2);
  animation-delay: -5s;
}

@keyframes pulse-glow {
  0% {
    transform: translate(0, 0) scale(1);
  }
  100% {
    transform: translate(8%, 10%) scale(1.15);
  }
}

/* Interactive Background Canvas */
.hero-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
  opacity: 0.45;
}

/* Utility Layout Containers */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* Glassmorphism Base Styles */
.glassmorphism {
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--border-glass);
  box-shadow: var(--shadow-glass);
}

/* Common Text Gradients */
.text-gradient {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.math-gradient-bg {
  background: linear-gradient(135deg, hsl(260, 85%, 65%), hsl(290, 85%, 60%));
}
.flutter-gradient-bg {
  background: linear-gradient(135deg, hsl(195, 90%, 55%), hsl(220, 90%, 50%));
}
.offline-gradient-bg {
  background: linear-gradient(135deg, hsl(160, 85%, 50%), hsl(185, 90%, 45%));
}

/* Navigation Menu */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  z-index: 100;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--border-glass);
  background: hsla(240, 20%, 8%, 0.4);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: all var(--transition-normal);
}
html[data-theme="light"] .navbar {
  background: hsla(240, 30%, 97%, 0.4);
}

.nav-container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 700;
  font-family: var(--font-family-display);
  font-size: 1.3rem;
  letter-spacing: -0.5px;
  transition: transform var(--transition-fast);
}
.nav-logo:hover {
  transform: scale(1.02);
}
.nav-logo svg {
  color: var(--primary-color);
  filter: drop-shadow(0 2px 8px var(--primary-glow));
}
.logo-accent {
  color: var(--secondary-color);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition-fast);
  position: relative;
}
.nav-link:hover {
  color: var(--text-primary);
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: width var(--transition-fast);
}
.nav-link:hover::after {
  width: 100%;
}

.nav-btn-contact {
  padding: 8px 18px;
  border-radius: var(--border-radius-full);
  border: 1px solid var(--border-glass);
  background: var(--bg-tertiary);
  transition: all var(--transition-fast);
}
.nav-btn-contact::after {
  display: none;
}
.nav-btn-contact:hover {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
  box-shadow: 0 4px 15px var(--primary-glow);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* Social Dock inside Navigation Bar */
.social-dock {
  display: flex;
  align-items: center;
  gap: 10px;
}

.social-dock-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  background: var(--bg-glass);
  backdrop-filter: blur(12px) saturate(180%);
  -webkit-backdrop-filter: blur(12px) saturate(180%);
  border: 1px solid var(--border-glass);
  transition: transform var(--transition-normal), background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  cursor: pointer;
  text-decoration: none;
}

.social-dock-btn:hover {
  transform: translateY(-3px) scale(1.08);
  color: var(--primary-color);
  background: var(--bg-tertiary);
  border-color: var(--primary-color);
  box-shadow: 0 4px 12px var(--primary-glow);
}

@media (max-width: 600px) {
  .social-dock {
    gap: 6px;
  }
  .social-dock-btn {
    width: 34px;
    height: 34px;
  }
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: none;
  border: 1px solid var(--border-glass);
  color: var(--text-primary);
  width: 42px;
  height: 42px;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}
.theme-toggle-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--primary-color);
  transform: translateY(-2px);
}
.sun-icon {
  display: none;
}
html[data-theme="dark"] .moon-icon {
  display: none;
}
html[data-theme="dark"] .sun-icon {
  display: block;
  color: var(--secondary-color);
}
html[data-theme="light"] .moon-icon {
  color: var(--primary-color);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
}

/* Button UI */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  border-radius: var(--border-radius-md);
  font-family: var(--font-family-display);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
}
.btn-primary {
  background: var(--primary-color);
  color: white;
  border: none;
  box-shadow: 0 4px 20px var(--primary-glow);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 30px var(--primary-glow);
  background: hsl(var(--primary-hue), 85%, 55%);
}
.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-glass);
}
.btn-secondary:hover {
  transform: translateY(-3px);
  background: var(--bg-secondary);
  border-color: var(--primary-color);
}
.btn-sm {
  padding: 6px 14px;
  font-size: 0.85rem;
  border-radius: var(--border-radius-sm);
}
.btn-lg {
  padding: 16px 36px;
  font-size: 1.1rem;
}
.btn-full-width {
  width: 100%;
}

/* Hero Section */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 100px;
  overflow: hidden;
}

.hero-container {
  display: grid;
  grid-template-columns: 1fr;
  z-index: 1;
}

.hero-content {
  max-width: 680px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: var(--border-radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 24px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--secondary-color);
  box-shadow: 0 0 8px var(--secondary-color);
  animation: pulse-dot 1.5s infinite alternate;
}

@keyframes pulse-dot {
  0% { transform: scale(0.85); opacity: 0.6; }
  100% { transform: scale(1.2); opacity: 1; }
}

.hero-title {
  font-family: var(--font-family-display);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  margin-bottom: 40px;
  max-width: 580px;
}

.hero-buttons {
  display: flex;
  gap: 16px;
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

.mouse-scroll {
  width: 26px;
  height: 44px;
  border-radius: var(--border-radius-full);
  border: 2px solid var(--text-tertiary);
  position: relative;
}
.mouse-scroll::after {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 6px;
  height: 10px;
  border-radius: var(--border-radius-full);
  background: var(--text-secondary);
  animation: scroll-wheel 1.6s infinite;
}

@keyframes scroll-wheel {
  0% { top: 8px; opacity: 1; }
  50% { top: 18px; opacity: 0.3; }
  100% { top: 8px; opacity: 1; }
}

/* Expertise Grid Section */
.expertise-section {
  padding: 80px 0;
  border-top: 1px solid var(--border-glass);
}

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.expertise-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: var(--border-radius-md);
  padding: 40px 32px;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.expertise-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: transparent;
  transition: background var(--transition-fast);
}

.expertise-card:hover {
  transform: translateY(-5px);
  background: var(--bg-tertiary);
  box-shadow: 0 12px 30px var(--shadow-color);
  border-color: var(--border-hover);
}

.expertise-card:hover::before {
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.expertise-icon {
  width: 54px;
  height: 54px;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  margin-bottom: 24px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.15);
}

.expertise-title {
  font-family: var(--font-family-display);
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.expertise-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* Project Directory Section */
.projects-section {
  padding: 100px 0;
  border-top: 1px solid var(--border-glass);
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 60px;
}

.section-title {
  font-family: var(--font-family-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 800;
  letter-spacing: -1px;
  margin-bottom: 16px;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* Controls Panel */
.controls-panel {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  padding: 16px 24px;
  border-radius: var(--border-radius-md);
  align-items: center;
  margin-bottom: 24px;
}

.search-box-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 16px;
  color: var(--text-tertiary);
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 14px 16px 14px 50px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: var(--border-radius-md);
  color: var(--text-primary);
  font-family: var(--font-family-sans);
  font-size: 0.95rem;
  outline: none;
  transition: all var(--transition-fast);
}

.search-input:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px var(--primary-glow);
  background: var(--bg-tertiary);
}

.search-clear-btn {
  position: absolute;
  right: 16px;
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 4px;
  border-radius: 50%;
  display: none;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.search-clear-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.filter-wrapper {
  display: flex;
  justify-content: flex-end;
}

.filter-tabs {
  display: flex;
  background: var(--bg-secondary);
  padding: 6px;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--border-glass);
}

.filter-btn {
  padding: 8px 20px;
  border: none;
  background: none;
  color: var(--text-secondary);
  font-family: var(--font-family-display);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
}
.filter-btn:hover {
  color: var(--text-primary);
}
.filter-btn.active {
  background: var(--bg-primary);
  color: var(--primary-color);
  box-shadow: 0 4px 12px var(--shadow-color);
}

/* Tag Cloud Filters */
.active-tags-container {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.active-tags-label {
  font-size: 0.85rem;
  color: var(--text-tertiary);
  font-weight: 500;
}

.tags-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-btn {
  padding: 4px 12px;
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  color: var(--text-secondary);
  border-radius: var(--border-radius-full);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.tag-btn:hover {
  border-color: var(--primary-color);
  color: var(--text-primary);
}
.tag-btn.active {
  background: var(--primary-glow);
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.search-status {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
  font-style: italic;
  display: none;
}

/* Projects Cards Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 32px;
  perspective: 1000px;
}

.project-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-secondary);
  border: 1px solid var(--border-glass);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal);
  transform-style: preserve-3d;
  height: 100%;
}

.project-card:hover {
  transform: translateY(-8px) rotateX(1deg);
  border-color: var(--border-hover);
  box-shadow: 0 16px 40px var(--shadow-color);
}

.project-thumbnail {
  height: 180px;
  position: relative;
  background: var(--bg-tertiary);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.thumbnail-canvas {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0.7;
}

.project-thumbnail-icon {
  z-index: 1;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.1);
  transform: scale(0.9);
  transition: transform var(--transition-fast);
}
.project-card:hover .project-thumbnail-icon {
  transform: scale(1);
}

.project-card-badge {
  position: absolute;
  top: 16px;
  left: 16px;
  z-index: 2;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 4px 10px;
  border-radius: var(--border-radius-sm);
  color: white;
}

.badge-math {
  background: linear-gradient(135deg, hsl(260, 80%, 55%), hsl(290, 80%, 50%));
}
.badge-flutter {
  background: linear-gradient(135deg, hsl(195, 85%, 45%), hsl(215, 85%, 40%));
}

.project-card-stat {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 2;
  font-size: 0.75rem;
  font-weight: 600;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #fff;
  padding: 4px 10px;
  border-radius: var(--border-radius-sm);
}

.project-info {
  padding: 28px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-card-title {
  font-family: var(--font-family-display);
  font-size: 1.35rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.project-card-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 24px;
  flex-grow: 1;
}

.project-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 24px;
}

.project-tag {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-tertiary);
  background: var(--bg-tertiary);
  padding: 2px 8px;
  border-radius: var(--border-radius-sm);
}

.project-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-glass);
  padding-top: 20px;
}

.btn-card-action {
  font-size: 0.85rem;
  padding: 8px 16px;
}

/* Animations for Grid Filtering */
.project-card.fade-out {
  opacity: 0;
  transform: scale(0.8) rotateX(-5deg);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.project-card.fade-in {
  opacity: 1;
  transform: scale(1) rotateX(0deg);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

/* Sandbox Section */
.sandbox-section {
  padding: 100px 0;
  border-top: 1px solid var(--border-glass);
}

.sandbox-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-glass);
}

.sandbox-canvas-wrapper {
  position: relative;
  display: flex;
  flex-direction: column;
  background: #06060c;
  min-height: 540px;
}
html[data-theme="light"] .sandbox-canvas-wrapper {
  background: #f0f0f7;
}

.canvas-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-glass);
  z-index: 10;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(10px);
}
html[data-theme="light"] .canvas-header {
  background: rgba(255, 255, 255, 0.4);
}

.canvas-live-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--secondary-color);
  background: var(--secondary-glow);
  border: 1px solid var(--secondary-color);
  padding: 2px 8px;
  border-radius: var(--border-radius-full);
  margin-bottom: 4px;
}

.canvas-title-wrapper h3 {
  font-family: var(--font-family-display);
  font-size: 1.15rem;
  font-weight: 700;
  color: white;
}
html[data-theme="light"] .canvas-title-wrapper h3 {
  color: var(--text-primary);
}

.canvas-actions {
  display: flex;
  gap: 8px;
}

.btn-canvas-action {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: white;
  width: 38px;
  height: 38px;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}
html[data-theme="light"] .btn-canvas-action {
  background: rgba(0, 0, 0, 0.05);
  border-color: rgba(0, 0, 0, 0.05);
  color: var(--text-primary);
}

.btn-canvas-action:hover {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.canvas-viewport {
  position: relative;
  flex-grow: 1;
  width: 100%;
  height: 100%;
}

.canvas-viewport canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Fourier Drawer Prompt Overlay */
.draw-prompt {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 5;
  transition: opacity 0.3s ease;
  backdrop-filter: blur(4px);
}
.draw-prompt.hidden {
  opacity: 0;
  pointer-events: none;
}

.draw-prompt-content {
  text-align: center;
  max-width: 320px;
  padding: 32px;
  background: rgba(15, 15, 25, 0.95);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--border-radius-lg);
  color: white;
  box-shadow: 0 10px 40px rgba(0,0,0,0.5);
}
.draw-prompt-content svg {
  color: var(--secondary-color);
  margin-bottom: 16px;
}
.draw-prompt-content p {
  font-size: 0.9rem;
  margin-bottom: 20px;
}

.canvas-footer {
  display: flex;
  justify-content: space-between;
  padding: 12px 24px;
  font-family: var(--font-family-mono);
  font-size: 0.8rem;
  color: var(--text-tertiary);
  border-top: 1px solid var(--border-glass);
}

/* Sandbox Sidebar controls */
.sandbox-controls-sidebar {
  padding: 32px 24px;
  background: var(--bg-secondary);
  border-left: 1px solid var(--border-glass);
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.custom-select-wrapper {
  position: relative;
}

.control-select {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-glass);
  border-radius: var(--border-radius-md);
  color: var(--text-primary);
  font-family: var(--font-family-sans);
  font-size: 0.9rem;
  outline: none;
  cursor: pointer;
  appearance: none;
}
.custom-select-wrapper::after {
  content: '▼';
  font-size: 0.75rem;
  color: var(--text-tertiary);
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
}

.model-description {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
  background: var(--bg-primary);
  padding: 16px;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--border-glass);
}

.sliders-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.slider-wrapper {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.slider-label-val {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  font-family: var(--font-family-mono);
}

.slider-name {
  font-weight: 600;
  color: var(--text-secondary);
}

.slider-value {
  color: var(--primary-color);
}

/* Custom HTML Range Slider */
input[type=range].slider-input {
  -webkit-appearance: none;
  width: 100%;
  background: transparent;
}
input[type=range].slider-input:focus {
  outline: none;
}
input[type=range].slider-input::-webkit-slider-runnable-track {
  width: 100%;
  height: 6px;
  cursor: pointer;
  background: var(--bg-tertiary);
  border-radius: var(--border-radius-full);
}
input[type=range].slider-input::-webkit-slider-thumb {
  height: 16px;
  width: 16px;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
  -webkit-appearance: none;
  margin-top: -5px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}
input[type=range].slider-input::-moz-range-track {
  width: 100%;
  height: 6px;
  cursor: pointer;
  background: var(--bg-tertiary);
  border-radius: var(--border-radius-full);
}
input[type=range].slider-input::-moz-range-thumb {
  height: 16px;
  width: 16px;
  border: none;
  border-radius: 50%;
  background: var(--primary-color);
  cursor: pointer;
}

/* Contact Footer Section */
.footer-section {
  padding: 100px 0 40px;
  border-top: 1px solid var(--border-glass);
}

.footer-container {
  display: flex;
  flex-direction: column;
  gap: 80px;
}

.footer-cta {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.footer-cta-title {
  font-family: var(--font-family-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  letter-spacing: -1.5px;
  margin-bottom: 24px;
  line-height: 1.1;
}

.footer-cta-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 40px;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--border-glass);
  padding-top: 40px;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-primary);
  font-family: var(--font-family-display);
  font-weight: 700;
  font-size: 1.15rem;
}
.footer-logo svg {
  color: var(--primary-color);
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-tertiary);
}

.footer-links {
  display: flex;
  gap: 16px;
}

.footer-link-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--border-glass);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}
.footer-link-icon:hover {
  background: var(--bg-tertiary);
  color: var(--primary-color);
  border-color: var(--primary-color);
  transform: translateY(-2px);
}

/* Modal Styling */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(5, 5, 10, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-wrapper {
  position: relative;
  width: 100%;
  max-width: 1100px;
  max-height: calc(100vh - 48px);
  border-radius: var(--border-radius-lg);
  overflow-y: auto;
  transform: scale(0.9) translateY(20px);
  transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-wrapper {
  transform: scale(1) translateY(0);
}

.modal-close-btn {
  position: absolute;
  top: 24px;
  right: 24px;
  z-index: 10;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: white;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}
html[data-theme="light"] .modal-close-btn {
  background: rgba(255, 255, 255, 0.6);
  border-color: var(--border-glass);
  color: var(--text-primary);
}

.modal-close-btn:hover {
  background: var(--accent-color);
  color: white;
  transform: rotate(90deg);
}

.modal-body-layout {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
}

/* Modal Visual Column */
.modal-visual-column {
  background: #040409;
  border-right: 1px solid var(--border-glass);
  padding: 48px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 480px;
}
html[data-theme="light"] .modal-visual-column {
  background: #eef2f6;
}

.modal-canvas-container {
  width: 100%;
  aspect-ratio: 4/3;
  max-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  border-radius: var(--border-radius-md);
}

.modal-canvas-container canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.modal-canvas-instruction {
  margin-top: 16px;
  font-size: 0.8rem;
  color: var(--text-tertiary);
  font-style: italic;
}

/* Simulated Flutter App Mockup inside Modal */
.flutter-preview-wrapper {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.phone-mockup {
  width: 190px;
  height: 380px;
  background: #111;
  border: 8px solid #222;
  border-radius: 36px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.6);
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.phone-speaker {
  width: 50px;
  height: 6px;
  background: #333;
  border-radius: var(--border-radius-full);
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
}

.phone-screen {
  flex-grow: 1;
  background: #090a0f;
  margin: 18px 6px 12px 6px;
  border-radius: 20px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  color: white;
}

.phone-status-bar {
  height: 24px;
  padding: 0 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.65rem;
  font-weight: 600;
  z-index: 5;
}

.status-icons {
  display: flex;
  gap: 4px;
}

.phone-app-content {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  position: relative;
  font-size: 0.75rem;
}

/* Flutter Mockup Internal Views */
.flutter-mock-header {
  padding: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.flutter-mock-header-title {
  font-weight: 700;
  font-size: 0.85rem;
}

.flutter-mock-content {
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.flutter-mock-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.05);
  border-radius: 8px;
  padding: 10px;
}
.flutter-mock-card-bar {
  height: 6px;
  background: rgba(255,255,255,0.2);
  border-radius: 3px;
  margin-top: 4px;
  width: 60%;
}
.flutter-mock-card-bar.accent {
  background: var(--primary-color);
  width: 90%;
}

.flutter-mock-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.flutter-mock-circle-stat {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  border: 4px solid var(--secondary-color);
  margin: 10px auto;
  font-weight: 700;
}

.phone-home-indicator {
  width: 80px;
  height: 4px;
  background: #444;
  border-radius: var(--border-radius-full);
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 10;
}

/* Modal Details Column */
.modal-details-column {
  padding: 48px;
  display: flex;
  flex-direction: column;
  gap: 28px;
  overflow-y: auto;
}

.modal-header-meta {
  display: flex;
  gap: 12px;
}

.project-badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 4px 10px;
  border-radius: var(--border-radius-sm);
  color: white;
}

.project-stat-badge {
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--bg-tertiary);
  border: 1px solid var(--border-glass);
  padding: 4px 10px;
  border-radius: var(--border-radius-sm);
}

.modal-project-title {
  font-family: var(--font-family-display);
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -1px;
}

.modal-details-column h4 {
  font-family: var(--font-family-display);
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-tertiary);
  letter-spacing: 0.5px;
  margin-bottom: 10px;
}

.modal-details-column p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* SVG Architecture Diagram in Modal */
.architecture-flow {
  background: var(--bg-tertiary);
  border: 1px solid var(--border-glass);
  border-radius: var(--border-radius-md);
  padding: 16px;
  display: flex;
  justify-content: center;
  align-items: center;
}
.arch-diagram-svg {
  width: 100%;
  max-width: 400px;
  height: auto;
  color: var(--text-primary);
}

.modal-actions-footer {
  display: flex;
  gap: 16px;
  border-top: 1px solid var(--border-glass);
  padding-top: 28px;
  margin-top: auto;
}

/* Responsive CSS */
@media (max-width: 1024px) {
  .navbar {
    height: 70px;
  }
  
  .hero-section {
    padding-top: 80px;
  }

  .sandbox-layout {
    grid-template-columns: 1fr;
  }
  
  .sandbox-controls-sidebar {
    border-left: none;
    border-top: 1px solid var(--border-glass);
  }
  
  .modal-body-layout {
    grid-template-columns: 1fr;
  }
  
  .modal-visual-column {
    border-right: none;
    border-bottom: 1px solid var(--border-glass);
    padding: 32px;
  }
  
  .modal-details-column {
    padding: 32px;
  }
}

@media (max-width: 768px) {
  .controls-panel {
    grid-template-columns: 1fr;
  }
  
  .filter-wrapper {
    justify-content: flex-start;
  }
  
  .filter-tabs {
    width: 100%;
  }
  
  .filter-btn {
    flex-grow: 1;
    text-align: center;
    padding: 10px;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  /* Collapsed mobile navigation menu */
  .nav-menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-glass);
    flex-direction: column;
    padding: 32px 24px;
    gap: 24px;
    align-items: stretch;
    box-shadow: var(--shadow-glass);
    transform: translateY(-120%);
    opacity: 0;
    transition: transform 0.4s ease, opacity 0.4s ease;
    z-index: 99;
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
  }
  
  .nav-btn-contact {
    text-align: center;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 600px) {
  .hero-title {
    font-size: 2.3rem;
  }
  
  .hero-buttons {
    flex-direction: column;
    width: 100%;
  }
  
  .hero-buttons .btn {
    width: 100%;
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .modal-wrapper {
    max-height: 100vh;
    border-radius: 0;
  }
  
  .modal-overlay {
    padding: 0;
  }
  
  .modal-visual-column {
    padding: 24px;
    min-height: 320px;
  }
  
  .modal-details-column {
    padding: 24px;
  }
  
  .modal-actions-footer {
    flex-direction: column;
  }
  .modal-actions-footer .btn {
    width: 100%;
  }
}

/* Subtle Micro-interactions and Animation Keyframes */
@keyframes shake-warning {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

.shake {
  animation: shake-warning 0.2s ease-in-out 2;
}

/* Fade-in Entrance Animations */
.animate-fade-in {
  animation: fade-in-up 0.6s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

.animate-title {
  animation: fade-in-up 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) 0.1s forwards;
  opacity: 0;
}

.animate-subtitle {
  animation: fade-in-up 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) 0.2s forwards;
  opacity: 0;
}

.animate-buttons {
  animation: fade-in-up 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) 0.3s forwards;
  opacity: 0;
}

@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Toast Notification */
.toast-notification {
  position: fixed;
  bottom: 32px;
  right: 32px;
  padding: 14px 22px;
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  z-index: 2000;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  transform: translateY(20px);
  opacity: 0;
  transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), opacity 0.35s ease;
  pointer-events: none;
}

.toast-notification.active {
  transform: translateY(0);
  opacity: 1;
}

@media (max-width: 600px) {
  .toast-notification {
    bottom: 24px;
    right: 24px;
    left: 24px;
    justify-content: center;
  }
}