/* ===================================
   CSS Custom Properties (Variables)
   =================================== */
:root {
  /* Colors - Light Mode */
  --color-bg: #f8fafc;
  --color-bg-secondary: #ffffff;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-primary: #6366f1;
  --color-primary-light: #818cf8;
  --color-primary-dark: #4f46e5;
  --color-primary-contrast: #4338ca;
  --color-accent: #06b6d4;
  --color-border: #e2e8f0;
  --color-card-bg: rgba(255, 255, 255, 0.8);
  --color-code-bg: #1e293b;
  --color-success: #10b981;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #06b6d4 100%);
  --gradient-text: linear-gradient(135deg, #6366f1, #06b6d4);
  --gradient-bg: radial-gradient(ellipse at top, #ddd6fe 0%, transparent 50%),
                 radial-gradient(ellipse at bottom, #a5f3fc 0%, transparent 50%);
  
  /* Typography */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Fira Code', 'Consolas', monospace;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 5rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* Layout */
  --max-width: 1200px;
  --nav-height: 70px;
}

/* Dark Mode Variables */
body.dark-mode {
  --color-bg: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-text: #f1f5f9;
  --color-text-secondary: #94a3b8;
  --color-border: #334155;
  --color-card-bg: rgba(30, 41, 59, 0.8);
  --color-code-bg: #0f172a;
  --color-primary-contrast: #a5b4fc;
  --gradient-bg: radial-gradient(ellipse at top, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
                 radial-gradient(ellipse at bottom, rgba(6, 182, 212, 0.1) 0%, transparent 50%);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 16px;
  font-size-adjust: 0.52;
  overflow-x: hidden;
  transition: background-color var(--transition-slow), color var(--transition-slow);
}

/* Selection */
::selection {
  background: var(--color-primary);
  color: white;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary-dark);
}

/* ===================================
   Background Animation
   =================================== */
.bg-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

.bg-gradient {
  position: absolute;
  width: 100%;
  height: 100%;
  background: var(--gradient-bg);
  opacity: 0.7;
  transition: opacity var(--transition-slow);
}

.bg-grid {
  position: absolute;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.3;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

/* ===================================
   Typography
   =================================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-text);
}

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

a:hover {
  color: var(--color-primary-light);
}

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

strong {
  color: var(--color-text);
  font-weight: 600;
}

/* ===================================
   Utility Classes
   =================================== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--spacing-md);
  background: var(--color-primary);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--spacing-md);
}

/* ===================================
   Buttons
   =================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.75rem;
  font-size: 0.9375rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
  text-decoration: none;
  gap: var(--spacing-xs);
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-md), 0 0 20px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(99, 102, 241, 0.4);
  color: white;
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-2px);
}

.btn-large {
  padding: 1rem 2.5rem;
  font-size: 1.0625rem;
}

/* ===================================
   Navigation
   =================================== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--color-card-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
  transition: all var(--transition-base);
}

.navbar.scrolled {
  box-shadow: var(--shadow-md);
}

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

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-size-adjust: 0.5;
  font-weight: 700;
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.nav-logo:hover {
  color: var(--color-primary);
}

.logo-bracket {
  color: var(--color-primary);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-link {
  position: relative;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  padding: var(--spacing-xs) 0;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: var(--radius-full);
  transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-text);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-base);
  color: var(--color-text);
}

.theme-toggle:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: white;
  transform: rotate(15deg);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-base);
}

.sun-icon {
  display: none;
}

body.dark-mode .sun-icon {
  display: block;
}

body.dark-mode .moon-icon {
  display: none;
}

/* Mobile Navigation */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 10px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
}

.nav-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===================================
   Hero Section
   =================================== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: calc(var(--nav-height) + var(--spacing-xl)) var(--spacing-md) var(--spacing-xl);
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-2xl);
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
}

.hero-greeting {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
}

.hero-name {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-sm);
}

.hero-title {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.hero-description {
  font-size: 1.125rem;
  max-width: 540px;
  margin-bottom: var(--spacing-lg);
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

/* Profile Card */
.hero-image {
  display: flex;
  justify-content: center;
}

.profile-card {
  position: relative;
  width: 320px;
  height: 320px;
}

.profile-image-wrapper {
  position: relative;
  width: 100%;
  height: 100%;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--gradient-primary);
  padding: 4px;
}

.profile-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: calc(var(--radius-xl) - 4px);
}

.profile-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 120%;
  height: 120%;
  background: var(--gradient-primary);
  filter: blur(60px);
  opacity: 0.3;
  z-index: -1;
  animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.3; transform: translate(-50%, -50%) scale(1); }
  50% { opacity: 0.5; transform: translate(-50%, -50%) scale(1.05); }
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
  animation: bounce 2s ease-in-out infinite;
}

.mouse {
  width: 24px;
  height: 38px;
  border: 2px solid var(--color-text-secondary);
  border-radius: 12px;
  position: relative;
}

.wheel {
  width: 4px;
  height: 8px;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  animation: scroll 2s ease-in-out infinite;
}

@keyframes scroll {
  0%, 100% { opacity: 1; top: 6px; }
  50% { opacity: 0; top: 18px; }
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(10px); }
}

/* ===================================
   Animations
   =================================== */
.animate-fade-up {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Reveal Animation */
.reveal {
  opacity: 0;
  transform: translateY(50px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* ===================================
   Sections
   =================================== */
.section {
  padding: var(--spacing-2xl) var(--spacing-md);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  margin-bottom: var(--spacing-xs);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.title-number {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-size-adjust: 0.5;
  color: var(--color-primary-contrast);
  font-weight: 400;
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
}

/* ===================================
   Featured Projects
   =================================== */
.featured-projects {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2xl);
}

.featured-project {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.featured-project.reverse {
  direction: rtl;
}

.featured-project.reverse > * {
  direction: ltr;
}

.project-overline {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-size-adjust: 0.5;
  color: var(--color-primary);
  margin-bottom: var(--spacing-xs);
}

.project-title {
  font-size: 1.75rem;
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

.project-description {
  background: var(--color-card-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: var(--spacing-md);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow-md);
}

.project-description p {
  font-size: 0.9375rem;
  line-height: 1.7;
}

.project-tech-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  list-style: none;
  margin-bottom: var(--spacing-md);
}

.project-tech-list li {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-size-adjust: 0.5;
  color: var(--color-text-secondary);
  background: var(--color-bg-secondary);
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.project-links {
  display: flex;
  gap: var(--spacing-sm);
}

.project-links a {
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.project-links a:hover {
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* Project Image / Code Preview */
.project-image-wrapper {
  position: relative;
}

.code-preview {
  background: var(--color-code-bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border);
}

.code-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid var(--color-border);
}

.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27ca40; }

.filename {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-size-adjust: 0.5;
  color: var(--color-text-secondary);
}

.code-content {
  padding: var(--spacing-md);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-size-adjust: 0.5;
  line-height: 1.8;
  color: #e2e8f0;
  margin: 0;
  overflow-x: auto;
}

.code-content .keyword { color: #c792ea; }
.code-content .comment { color: #637777; }
.code-content .string { color: #c3e88d; }
.code-content .success { color: var(--color-success); }

/* Extension Demo */
.extension-demo {
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.bsr-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--color-primary);
}

.bsr-rank {
  font-family: var(--font-mono);
  font-size-adjust: 0.5;
  font-weight: 600;
  color: var(--color-success);
  min-width: 60px;
}

.bsr-category {
  color: #e2e8f0;
  font-size: 0.875rem;
}

.camel-link {
  margin-top: var(--spacing-sm);
  padding-top: var(--spacing-sm);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #c7d2fe;
  font-size: 0.8125rem;
  cursor: default;
  text-decoration: underline;
}

/* Puzzle Grid */
.puzzle-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
  padding: var(--spacing-md);
  background: rgba(255, 255, 255, 0.05);
  margin: var(--spacing-sm);
  border-radius: var(--radius-sm);
}

.puzzle-cell {
  aspect-ratio: 1;
  background: rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  border-radius: 2px;
}

.puzzle-cell.queen {
  background: var(--color-primary);
  color: white;
}

/* Stabbot App Preview */
.stabbot-preview {
  background: #0c0c14 !important;
}

.stabbot-app {
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

.stabbot-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.stabbot-logo {
  display: flex;
  align-items: center;
  gap: 7px;
}

.stabbot-logo-icon {
  font-size: 16px;
  line-height: 1;
}

.stabbot-logo-text {
  font-size: 12px;
  font-weight: 600;
  color: #e8eaf0;
  letter-spacing: -0.01em;
}

.stabbot-badge {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 3px 9px;
  border-radius: 12px;
  background: #1a1a2e;
  border: 1px solid rgba(255, 255, 255, 0.06);
  font-size: 9px;
  color: #94a3b8;
}

.stabbot-badge-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #10b981;
  flex-shrink: 0;
}

.stabbot-file-info {
  text-align: center;
  padding: 12px 14px 6px;
}

.stabbot-file-name {
  font-size: 11px;
  font-weight: 500;
  color: #e8eaf0;
  margin-bottom: 2px;
}

.stabbot-file-meta {
  font-size: 9.5px;
  color: #94a3b8;
}

.stabbot-quality-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 8px 14px;
}

.stabbot-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 12px 8px;
  background: #1a1a2e;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 8px;
  transition: all 0.25s ease;
}

.stabbot-card-icon {
  font-size: 18px;
  margin-bottom: 4px;
  line-height: 1;
}

.stabbot-card-label {
  font-size: 10px;
  font-weight: 500;
  color: #e8eaf0;
}

.stabbot-card-hq {
  border-color: rgba(168, 85, 247, 0.4);
  box-shadow: 0 0 12px rgba(168, 85, 247, 0.12);
}

.stabbot-card-custom {
  border-color: rgba(245, 158, 11, 0.3);
  box-shadow: 0 0 12px rgba(245, 158, 11, 0.08);
}

.stabbot-card-opencv {
  border-color: rgba(20, 184, 166, 0.3);
  box-shadow: 0 0 12px rgba(20, 184, 166, 0.08);
}

.stabbot-card-raft {
  border-color: rgba(139, 92, 246, 0.3);
  box-shadow: 0 0 12px rgba(139, 92, 246, 0.08);
}

.stabbot-divider {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 14px;
}

.stabbot-divider::before,
.stabbot-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: rgba(255, 255, 255, 0.06);
}

.stabbot-divider span {
  font-size: 8px;
  color: #5c6078;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.stabbot-advanced-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 4px 14px 14px;
}

.stabbot-advanced-grid .stabbot-card {
  padding: 10px 8px;
}

/* ===================================
   Other Projects Grid
   =================================== */
.other-projects {
  margin-top: var(--spacing-2xl);
  text-align: center;
}

.other-projects-title {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-xs);
}

.other-projects-subtitle {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.toggle-projects-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base);
  margin-bottom: var(--spacing-lg);
}

.toggle-projects-btn:hover {
  background: var(--color-primary);
  color: white;
}

.toggle-projects-btn svg {
  transition: transform var(--transition-base);
}

.toggle-projects-btn.active svg {
  transform: rotate(180deg);
}

.school-projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-md);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: all 0.5s ease;
}

.school-projects-grid.active {
  max-height: 2000px;
  opacity: 1;
  margin-top: var(--spacing-md);
}

.project-card {
  background: var(--color-card-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: left;
  transition: all var(--transition-base);
}

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

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-md);
}

.folder-icon {
  color: var(--color-primary);
}

.card-links a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.card-links a:hover {
  color: var(--color-primary);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
  transition: color var(--transition-fast);
}

.project-card:hover .card-title {
  color: var(--color-primary);
}

.card-description {
  font-size: 0.9375rem;
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
}

.card-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  list-style: none;
}

.card-tech li {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

/* ===================================
   About Section
   =================================== */
.about-content {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--spacing-2xl);
  align-items: start;
}

.about-text p {
  margin-bottom: var(--spacing-md);
  font-size: 1rem;
  line-height: 1.8;
}

.skills-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-xs) var(--spacing-lg);
  list-style: none;
  margin-top: var(--spacing-md);
}

.skills-list li {
  position: relative;
  padding-left: var(--spacing-md);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-size-adjust: 0.5;
  color: var(--color-text-secondary);
}

.skills-list li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--color-primary);
}

/* About Image */
.about-image {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.image-wrapper {
  position: relative;
  max-width: 300px;
  margin: 0 auto;
}

.image-wrapper img {
  width: 100%;
  border-radius: var(--radius-lg);
  filter: grayscale(20%);
  transition: filter var(--transition-base);
}

.image-wrapper:hover img {
  filter: grayscale(0%);
}

.image-border {
  position: absolute;
  top: 20px;
  left: 20px;
  width: 100%;
  height: 100%;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  z-index: -1;
  transition: all var(--transition-base);
}

.image-wrapper:hover .image-border {
  top: 15px;
  left: 15px;
}

/* Interests */
.interests {
  margin-top: var(--spacing-2xl);
  text-align: center;
}

.interests h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-secondary);
}

.interests-grid {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

.interest-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-md);
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  min-width: 120px;
  transition: all var(--transition-base);
}

.interest-item:hover {
  transform: translateY(-5px);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.interest-icon {
  font-size: 2rem;
}

.interest-text {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* ===================================
   Contact Section
   =================================== */
.contact-section {
  text-align: center;
  padding-bottom: var(--spacing-2xl);
}

.contact-content {
  max-width: 600px;
  margin: 0 auto;
}

.contact-text {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-lg);
  line-height: 1.8;
}

/* Email Container */
.email-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  margin-bottom: var(--spacing-lg);
}

.email-address {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  color: var(--color-primary);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
}

.copy-btn.copied {
  background: var(--color-success);
  border-color: var(--color-success);
  color: white;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
}

.social-link:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  transform: translateY(-3px);
}

/* ===================================
   Footer
   =================================== */
.footer {
  padding: var(--spacing-lg) var(--spacing-md);
  text-align: center;
  border-top: 1px solid var(--color-border);
}

.footer p {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.footer-year {
  margin-top: var(--spacing-xs);
}

/* ===================================
   Scroll to Top Button
   =================================== */
.scroll-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--gradient-primary);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-lg);
  z-index: 99;
}

.scroll-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-to-top:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
}

/* ===================================
   Focus States
   =================================== */
button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--spacing-xl);
  }
  
  .hero-text {
    order: 2;
  }
  
  .hero-image {
    order: 1;
  }
  
  .hero-description {
    margin-left: auto;
    margin-right: auto;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .profile-card {
    width: 250px;
    height: 250px;
  }
  
  .featured-project,
  .featured-project.reverse {
    grid-template-columns: 1fr;
    direction: ltr;
  }
  
  .project-image {
    order: -1;
  }
  
  .about-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .about-image {
    order: -1;
    margin-bottom: var(--spacing-lg);
  }
  
  .skills-list {
    justify-content: center;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 60px;
  }
  
  .nav-menu {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: var(--spacing-lg);
    gap: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
  }
  
  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .hero {
    padding-top: calc(var(--nav-height) + var(--spacing-lg));
  }
  
  .hero-name {
    font-size: 2.5rem;
  }
  
  .hero-title {
    font-size: 1.25rem;
  }
  
  .scroll-indicator {
    display: none;
  }
  
  .school-projects-grid {
    grid-template-columns: 1fr;
  }
  
  .scroll-to-top {
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
  }
}

@media (max-width: 480px) {
  .btn {
    width: 100%;
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .profile-card {
    width: 200px;
    height: 200px;
  }
  
  .social-links {
    gap: var(--spacing-sm);
  }
  
  .social-link {
    width: 44px;
    height: 44px;
  }
}

/* ===================================
   Reduced Motion
   =================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}