/* =====================================
   AI Leadership Lab - Main Stylesheet
   Version: 2.1 - Bug Fixed & Enhanced
   ===================================== */

/* ================ Variables ================ */
:root {
  /* Colors - Light Mode */
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #a855f7;
  --secondary-dark: #9333ea;
  
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  
  --border-color: #e2e8f0;
  --shadow-color: rgba(0, 0, 0, 0.1);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;
  
  /* Typography */
  --font-primary: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;
  
  /* Animation */
  --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
}

/* ================ Dark Mode Support ================ */
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #818cf8;
    --primary-dark: #6366f1;
    --secondary: #c084fc;
    --secondary-dark: #a855f7;
    
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    
    --border-color: #475569;
    --shadow-color: rgba(0, 0, 0, 0.3);
  }
  
  .hero-gradient {
    opacity: 0.95;
  }
  
  .navbar {
    background: rgba(15, 23, 42, 0.95);
  }
  
  .navbar.scrolled {
    background: rgba(15, 23, 42, 0.98);
  }
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* Fix for mobile menu scroll lock */
body.menu-open {
  overflow: hidden;
  position: fixed;
  width: 100%;
}

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

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition-base);
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul {
  list-style: none;
}

/* ================ Accessibility ================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Focus styles for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* ================ Utilities ================ */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.text-gradient {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: inline-block;
}

.text-highlight {
  color: #FFD700;
  text-shadow: 0 0 30px rgba(255, 215, 0, 0.5),
               0 0 60px rgba(255, 215, 0, 0.3),
               0 4px 20px rgba(0, 0, 0, 0.4);
  font-weight: 900;
  display: inline-block;
  position: relative;
  animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
  from {
    text-shadow: 0 0 30px rgba(255, 215, 0, 0.5),
                 0 0 60px rgba(255, 215, 0, 0.3),
                 0 4px 20px rgba(0, 0, 0, 0.4);
  }
  to {
    text-shadow: 0 0 35px rgba(255, 215, 0, 0.7),
                 0 0 65px rgba(255, 215, 0, 0.5),
                 0 4px 25px rgba(0, 0, 0, 0.5);
  }
}

.gradient-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.text-center {
  text-align: center;
}

/* ================ Form Messages ================ */
.form-message {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  margin-top: var(--spacing-md);
  font-size: var(--font-size-sm);
  animation: fadeInUp 0.3s ease-out;
}

.form-message.error {
  background-color: #fee2e2;
  color: #dc2626;
  border: 1px solid #fca5a5;
}

.form-message.success {
  background-color: #dcfce7;
  color: #16a34a;
  border: 1px solid #86efac;
}

/* ================ Loading Screen ================ */
.loader {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity 0.5s ease-out, visibility 0.5s ease-out;
}

.loader.loaded {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loader-content {
  text-align: center;
}

.loader-logo {
  font-size: 2rem;
  font-weight: bold;
  color: white;
  margin-bottom: 2rem;
  animation: pulse 2s infinite;
}

.loader-progress {
  width: 200px;
  height: 4px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.loader-progress-bar {
  height: 100%;
  background: white;
  border-radius: var(--radius-full);
  animation: progress 2s ease-out;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

@keyframes progress {
  0% { width: 0; }
  100% { width: 100%; }
}

/* ================ Navigation ================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1000;
  transition: var(--transition-base);
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
}

.nav-wrapper {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
}

.logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
}

.logo-text {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-link {
  position: relative;
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--text-secondary);
  transition: var(--transition-base);
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
  transition: width 0.3s ease;
}

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

.nav-cta {
  padding: var(--spacing-xs) var(--spacing-lg);
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
  border-radius: var(--radius-full);
  font-weight: 600;
}

.nav-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(99, 102, 241, 0.3);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: var(--spacing-xs);
}

.nav-toggle .bar {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition-base);
}

.nav-toggle.active .bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.nav-toggle.active .bar:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ================ Hero Section ================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--spacing-3xl) 0;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -1;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #5a67d8 0%, #6b46c1 100%);
  opacity: 0.97;
}

.hero-pattern {
  position: absolute;
  inset: 0;
  background-image: 
    radial-gradient(circle at 1px 1px, rgba(255, 255, 255, 0.1) 1px, transparent 1px);
  background-size: 40px 40px;
}

.hero-content {
  text-align: center;
  color: white;
  max-width: 900px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-lg);
}

.hero-title {
  font-size: clamp(2rem, 5vw + 1rem, 4.5rem);
  font-weight: 900;
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.4),
               0 4px 20px rgba(0, 0, 0, 0.3);
}

.hero-description {
  font-size: clamp(1rem, 2vw, 1.25rem);
  line-height: 1.7;
  opacity: 1;
  margin-bottom: var(--spacing-xl);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  font-weight: 500;
}

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

/* ================ Buttons ================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: var(--transition-base);
  cursor: pointer;
  border: none;
  text-decoration: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.2);
  color: white;
  backdrop-filter: blur(10px);
  border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.3);
  border-color: rgba(255, 255, 255, 0.5);
}

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

.btn-outline:hover:not(:disabled) {
  background: var(--primary);
  color: white;
}

.btn-large {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

.btn-icon {
  width: 20px;
  height: 20px;
  transition: transform 0.3s ease;
}

.btn:hover .btn-icon {
  transform: translate(2px, -2px);
}

.btn-icon-sm {
  width: 16px;
  height: 16px;
}

/* ================ Stats Grid ================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-3xl);
}

.stat-card {
  padding: var(--spacing-lg);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  transition: var(--transition-base);
}

.stat-card:hover {
  transform: translateY(-5px);
  background: rgba(255, 255, 255, 0.15);
}

.stat-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  flex-shrink: 0;
}

.stat-icon svg {
  width: 24px;
  height: 24px;
  color: white;
}

.stat-content {
  flex: 1;
}

.stat-value {
  display: block;
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: white;
  margin-bottom: 0.25rem;
}

.stat-label {
  display: block;
  font-size: var(--font-size-sm);
  color: rgba(255, 255, 255, 0.8);
}

/* ================ Scroll Indicator ================ */
.scroll-indicator {
  position: absolute;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  animation: bounce 2s infinite;
}

.scroll-text {
  display: block;
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: var(--spacing-xs);
}

.scroll-icon {
  width: 30px;
  height: 50px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 25px;
  position: relative;
  margin: 0 auto;
}

.scroll-dot {
  width: 6px;
  height: 6px;
  background: white;
  border-radius: 50%;
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  animation: scroll-dot 2s infinite;
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: translateX(-50%) translateY(0);
  }
  40% {
    transform: translateX(-50%) translateY(-10px);
  }
  60% {
    transform: translateX(-50%) translateY(-5px);
  }
}

@keyframes scroll-dot {
  0% {
    top: 10px;
    opacity: 1;
  }
  100% {
    top: 30px;
    opacity: 0;
  }
}

/* ================ Sections ================ */
.section {
  padding: var(--spacing-3xl) 0;
}

.section-about {
  background: var(--bg-primary);
}

.section-header {
  margin-bottom: var(--spacing-3xl);
}

.section-label {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 3rem);
  font-weight: 900;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: var(--spacing-md);
}

.section-description {
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
}

/* ================ About Section ================ */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.about-content {
  padding-right: var(--spacing-xl);
}

.lead-text {
  font-size: var(--font-size-lg);
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

.feature-list {
  margin-top: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.feature-item {
  display: flex;
  gap: var(--spacing-md);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(168, 85, 247, 0.1) 100%);
  border-radius: var(--radius-lg);
  flex-shrink: 0;
}

.feature-icon svg {
  width: 24px;
  height: 24px;
  color: var(--primary);
}

.feature-item h4 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  margin-bottom: 0.25rem;
  color: var(--text-primary);
}

.feature-item p {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
}

.about-visual {
  position: relative;
}

.image-card {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.image-card img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.5s ease;
}

.image-card:hover img {
  transform: scale(1.05);
}

.image-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(168, 85, 247, 0.2) 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.image-card:hover .image-overlay {
  opacity: 1;
}

.floating-card {
  position: absolute;
  bottom: -20px;
  right: -20px;
  padding: var(--spacing-lg);
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
  text-align: center;
  min-width: 150px;
}

.floating-card-icon {
  margin-bottom: var(--spacing-sm);
}

.floating-card h4 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 0.25rem;
}

.floating-card p {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

/* ================ Director Section ================ */
.section-director {
  background: var(--bg-secondary);
}

.director-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.director-image {
  position: relative;
}

.image-frame {
  position: relative;
  max-width: 500px;
  margin: 0 auto;
}

.image-frame img {
  width: 100%;
  border-radius: var(--radius-2xl);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
}

.image-decoration {
  position: absolute;
  top: -20px;
  left: -20px;
  right: 20px;
  bottom: 20px;
  border: 3px solid;
  border-image: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%) 1;
  border-radius: var(--radius-2xl);
  z-index: -1;
}

.badge-floating {
  position: absolute;
  bottom: 20px;
  right: 20px;
  animation: float 3s ease-in-out infinite;
}

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

.director-name {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.director-title {
  font-size: var(--font-size-lg);
  color: var(--secondary);
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
}

.director-quote {
  font-size: var(--font-size-lg);
  line-height: 1.8;
  color: var(--text-secondary);
  border-left: 4px solid;
  border-image: linear-gradient(180deg, var(--primary) 0%, var(--secondary) 100%) 1;
  padding-left: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.director-credentials {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.credential-item {
  display: flex;
  gap: var(--spacing-md);
}

.credential-label {
  font-weight: 700;
  color: var(--text-primary);
  min-width: 100px;
}

.credential-value {
  color: var(--text-secondary);
}

.director-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.director-badges .badge {
  padding: var(--spacing-xs) var(--spacing-md);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(168, 85, 247, 0.1) 100%);
  color: var(--primary);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

/* ================ Quotes Section ================ */
.section-quotes {
  background: var(--bg-primary);
  padding: var(--spacing-3xl) 0;
}

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

.quote-card {
  padding: var(--spacing-xl);
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  position: relative;
  transition: var(--transition-base);
}

.quote-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

.quote-icon {
  position: absolute;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  color: var(--primary);
}

.quote-card blockquote {
  font-size: var(--font-size-lg);
  line-height: 1.7;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  border: none;
  padding: 0;
}

.quote-card footer {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.quote-card cite {
  font-style: normal;
  font-weight: 700;
  color: var(--primary);
}

.quote-card span {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

/* ================ Publications Section ================ */
.section-publications {
  background: var(--bg-secondary);
}

.books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-xl);
}

.book-card {
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  transition: var(--transition-base);
}

.book-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.book-cover {
  position: relative;
  height: 300px;
  background: var(--bg-tertiary);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.book-cover img {
  width: auto;
  max-width: 200px;
  height: auto;
  max-height: 280px;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.book-card:hover .book-cover img {
  transform: scale(1.05);
}

.book-badge {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--primary);
  color: white;
  border-radius: var(--radius-md);
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.book-content {
  padding: var(--spacing-xl);
}

.book-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
  line-height: 1.3;
}

.book-description {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

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

/* ================ Projects Section ================ */
.section-projects {
  background: var(--bg-primary);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-2xl);
}

.project-card {
  background: var(--bg-secondary);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
  transition: var(--transition-base);
  text-align: center;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
  border-color: var(--primary);
}

.project-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--spacing-sm);
  padding: var(--spacing-xs);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(168, 85, 247, 0.1) 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-base);
}

.project-card:hover .project-icon {
  transform: scale(1.1);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(168, 85, 247, 0.2) 100%);
}

.project-icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--primary);
}

.project-card:hover .project-icon svg {
  stroke: var(--secondary);
}

.project-name {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
  line-height: 1.2;
}

.project-desc {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  line-height: 1.4;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}

/* Placeholder Cards */
.project-card-placeholder {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  border: 2px dashed var(--border-color);
  cursor: default;
}

.project-card-placeholder:hover {
  transform: none;
  border-color: var(--primary);
}

.project-card-placeholder .project-icon {
  background: transparent;
}

.project-card-placeholder .project-icon svg {
  stroke: var(--text-muted);
  opacity: 0.5;
}

.project-card-placeholder:hover .project-icon svg {
  stroke: var(--primary);
  opacity: 0.7;
}

.project-more {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Responsive adjustments */
@media (min-width: 640px) {
  .projects-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

@media (max-width: 640px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
  }
  
  .project-card {
    padding: var(--spacing-md);
  }
}

/* ================ Contact Section ================ */
.section-contact {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.contact-info .section-title {
  color: white;
}

.contact-description {
  font-size: var(--font-size-lg);
  line-height: 1.7;
  opacity: 0.9;
  margin-bottom: var(--spacing-xl);
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.contact-method {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
  transition: var(--transition-base);
  color: white;
}

.contact-method:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateX(5px);
}

.contact-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-lg);
}

.contact-method h4 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  opacity: 0.8;
  margin-bottom: 0.25rem;
}

.contact-method p {
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.contact-hours {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-size-base);
  opacity: 0.8;
}

.contact-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-card {
  width: 100%;
  max-width: 400px;
  background: white;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.contact-card-header {
  padding: var(--spacing-md);
  background: var(--bg-tertiary);
  display: flex;
  gap: var(--spacing-xs);
}

.contact-card-header .dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #ddd;
}

.contact-card-header .dot:first-child {
  background: #ff5f57;
}

.contact-card-header .dot:nth-child(2) {
  background: #ffbd2e;
}

.contact-card-header .dot:nth-child(3) {
  background: #28ca42;
}

.contact-card-body {
  padding: var(--spacing-xl);
  min-height: 300px;
}

.message-bubble {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-lg);
  margin-bottom: var(--spacing-md);
  max-width: 80%;
  animation: fadeInUp 0.5s ease-out;
}

.message-received {
  background: var(--bg-tertiary);
  color: var(--text-primary);
  align-self: flex-start;
}

.message-sent {
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
  align-self: flex-end;
  margin-left: auto;
}

.typing-indicator {
  display: flex;
  gap: 4px;
  padding: var(--spacing-sm);
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
  animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typing {
  0%, 60%, 100% {
    transform: translateY(0);
  }
  30% {
    transform: translateY(-10px);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ================ Footer ================ */
.footer {
  background: var(--text-primary);
  color: white;
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-3xl);
  margin-bottom: var(--spacing-xl);
}

.footer-brand {
  max-width: 400px;
}

.footer-logo {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  display: inline-block;
}

.footer-tagline {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.7;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-xl);
}

.footer-column h4 {
  font-size: var(--font-size-base);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.footer-column li {
  color: rgba(255, 255, 255, 0.7);
  transition: var(--transition-base);
}

.footer-column a:hover {
  color: white;
  transform: translateX(5px);
  display: inline-block;
}

.footer-bottom {
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-bottom p {
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--font-size-sm);
}

.footer-social {
  display: flex;
  gap: var(--spacing-md);
}

.footer-social a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  transition: var(--transition-base);
}

.footer-social a:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

/* ================ Back to Top Button ================ */
.back-to-top {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition-base);
  z-index: 999;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(99, 102, 241, 0.4);
}

/* ================ Animations ================ */
.animate-fade-in {
  animation: fadeIn 0.8s ease-out;
}

.animate-fade-in-delay {
  animation: fadeIn 0.8s ease-out 0.3s both;
}

.animate-slide-up {
  animation: slideUp 0.8s ease-out;
}

.animate-slide-up-delay {
  animation: slideUp 0.8s ease-out 0.2s both;
}

.animate-fade-in-up {
  animation: fadeInUp 0.8s ease-out 0.4s both;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ================ Responsive Design ================ */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .nav-menu {
    position: fixed;
    top: 70px;
    right: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: var(--bg-primary);
    flex-direction: column;
    padding: var(--spacing-xl) var(--spacing-md);
    gap: var(--spacing-lg);
    transition: right 0.3s ease;
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
  }

  .nav-menu.active {
    right: 0;
  }

  .nav-toggle {
    display: flex;
  }

  .hero-title {
    font-size: clamp(2rem, 8vw, 2.5rem);
  }

  .hero-description {
    font-size: var(--font-size-lg);
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    width: 100%;
  }

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

  .about-grid,
  .director-wrapper,
  .contact-wrapper,
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
  }

  .about-content {
    padding-right: 0;
  }

  .floating-card {
    position: relative;
    bottom: 0;
    right: 0;
    margin-top: var(--spacing-lg);
  }

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

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

  .footer-bottom {
    flex-direction: column;
    gap: var(--spacing-md);
    text-align: center;
  }

  .back-to-top {
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    width: 40px;
    height: 40px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: clamp(1.75rem, 7vw, 2rem);
  }
  
  .section-title {
    font-size: clamp(1.5rem, 5vw, 1.75rem);
  }
  
  .projects-marquee {
    padding: var(--spacing-lg) 0;
  }
}

/* ================ Print Styles ================ */
@media print {
  .navbar,
  .back-to-top,
  .scroll-indicator {
    display: none;
  }
  
  .section {
    page-break-inside: avoid;
  }
}

/* ================ High Contrast Mode ================ */
@media (prefers-contrast: high) {
  :root {
    --primary: #5052f0;
    --secondary: #9f3af5;
    --text-primary: #000000;
    --text-secondary: #333333;
  }
  
  @media (prefers-color-scheme: dark) {
    :root {
      --text-primary: #ffffff;
      --text-secondary: #e5e5e5;
      --bg-primary: #000000;
      --bg-secondary: #1a1a1a;
    }
  }
}