/* ============================================================
   Academic Project Page — Custom Styles
   Features: Glassmorphism, Dark/Light themes, Animations, Responsive
   ============================================================ */

/* ==================== CSS Variables / Themes ==================== */
:root {
  --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 500ms cubic-bezier(0.4, 0, 0.2, 1);
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-border: rgba(255, 255, 255, 0.08);
  --glass-hover-bg: rgba(255, 255, 255, 0.06);
}

/* Light theme overrides */
[data-theme="light"] {
  --glass-bg: rgba(255, 255, 255, 0.6);
  --glass-border: rgba(0, 0, 0, 0.1);
  --glass-hover-bg: rgba(255, 255, 255, 0.8);
}

[data-theme="light"] body {
  background: #f5f7fa;
  color: #1a1a2e;
}

[data-theme="light"] .glass-card {
  background: var(--glass-bg);
  border-color: var(--glass-border);
}

[data-theme="light"] .section-title {
  color: #1a1a2e;
}

[data-theme="light"] .section-subtitle {
  color: #6b7280;
}

[data-theme="light"] .glass-btn {
  background: rgba(255, 255, 255, 0.8);
  border-color: rgba(0, 0, 0, 0.1);
  color: #1a1a2e;
}

[data-theme="light"] .glass-btn:hover {
  background: #fff;
  border-color: rgba(0, 0, 0, 0.2);
}

[data-theme="light"] #navbar.scrolled {
  background: rgba(255, 255, 255, 0.8);
  border-color: rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .nav-link {
  color: #6b7280;
}

[data-theme="light"] .nav-link:hover,
[data-theme="light"] .nav-link.active {
  color: #1a1a2e;
  background: rgba(0, 0, 0, 0.05);
}

[data-theme="light"] .prose-custom p {
  color: #4b5563;
}

[data-theme="light"] #bibtex-code {
  background: #f0f1f5;
  border-color: rgba(0, 0, 0, 0.06);
  color: #374151;
}

[data-theme="light"] .carousel-btn {
  background: rgba(255, 255, 255, 0.9);
  border-color: rgba(0, 0, 0, 0.1);
  color: #374151;
}

[data-theme="light"] .carousel-dot {
  background: rgba(0, 0, 0, 0.15);
}

[data-theme="light"] .carousel-dot.active {
  background: #1a1a2e;
}

[data-theme="light"] #copy-btn {
  background: rgba(0, 0, 0, 0.04);
  border-color: rgba(0, 0, 0, 0.08);
  color: #374151;
}

[data-theme="light"] #copy-btn:hover {
  background: rgba(0, 0, 0, 0.08);
}

[data-theme="light"] footer {
  border-color: rgba(0, 0, 0, 0.06);
}

/* ==================== Base Styles ==================== */
html {
  scroll-behavior: smooth;
}

body {
  transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.25);
}

/* Selection */
::selection {
  background: rgba(0, 191, 165, 0.3);
  color: #fff;
}

/* ==================== Glassmorphism Cards ==================== */
.glass-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 1rem;
  transition: all var(--transition-base);
}

.glass-card:hover {
  border-color: rgba(255, 255, 255, 0.12);
}

[data-theme="light"] .glass-card:hover {
  border-color: rgba(0, 0, 0, 0.15);
}

/* ==================== Glass Buttons ==================== */
.glass-btn {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 0.75rem;
  color: #e5e7eb;
  font-weight: 500;
  font-size: 0.95rem;
  transition: all var(--transition-base);
  text-decoration: none;
  cursor: pointer;
}

.glass-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  color: #fff;
}

.glass-btn:active {
  transform: translateY(0);
}

/* ==================== Navigation ==================== */
#navbar {
  background: transparent;
  border-bottom: 1px solid transparent;
}

#navbar.scrolled {
  background: rgba(10, 15, 30, 0.75);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

#navbar.scrolled #nav-logo {
  opacity: 1;
}

.nav-link {
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  background: #00bfa5;
  border-radius: 1px;
  transition: transform var(--transition-base);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: translateX(-50%) scaleX(1);
}

.nav-link.active {
  color: #fff !important;
  background: rgba(255, 255, 255, 0.08) !important;
}

/* ==================== Section Headers ==================== */
.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: #fff;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.section-subtitle {
  font-size: 1.1rem;
  color: #9ca3af;
  font-weight: 400;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

@media (max-width: 768px) {
  .section-title {
    font-size: 1.75rem;
  }
}

/* ==================== Scroll Reveal Animation ==================== */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

/* ==================== Hover Lift ==================== */
.hover-lift {
  transition: all var(--transition-base);
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
  border-color: rgba(255, 255, 255, 0.15);
}

/* ==================== Scene Tabs ==================== */
.scene-tab {
  padding: 0.5rem 1.25rem;
  border-radius: 0.5rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: #9ca3af;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-base);
  text-transform: capitalize;
}

.scene-tab:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #e5e7eb;
}

.scene-tab.active {
  background: rgba(0, 191, 165, 0.15);
  border-color: rgba(0, 191, 165, 0.4);
  color: #64ffda;
  box-shadow: 0 0 12px rgba(0, 191, 165, 0.15);
}

[data-theme="light"] .scene-tab {
  background: rgba(0, 0, 0, 0.03);
  border-color: rgba(0, 0, 0, 0.08);
  color: #6b7280;
}

[data-theme="light"] .scene-tab:hover {
  background: rgba(0, 0, 0, 0.06);
  color: #374151;
}

[data-theme="light"] .scene-tab.active {
  background: rgba(0, 191, 165, 0.12);
  border-color: rgba(0, 191, 165, 0.5);
  color: #008e76;
}

/* ==================== Comparison Grid ==================== */
.comparison-thumb {
  position: relative;
  aspect-ratio: 4/3;
  border-radius: 0.5rem;
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition-base);
  border: 2px solid transparent;
  background: #0d1737;
}

.comparison-thumb:hover {
  transform: scale(1.03);
  border-color: rgba(255, 255, 255, 0.2);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  z-index: 2;
}

.comparison-thumb.ours {
  border-color: rgba(0, 191, 165, 0.5);
  box-shadow: 0 0 16px rgba(0, 191, 165, 0.15);
}

.comparison-thumb.ours:hover {
  border-color: rgba(100, 255, 218, 0.7);
  box-shadow: 0 0 24px rgba(0, 191, 165, 0.3);
}

.comparison-thumb.gt {
  border-color: rgba(34, 197, 94, 0.4);
}

.comparison-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.comparison-thumb .method-badge {
  position: absolute;
  bottom: 4px;
  left: 4px;
  right: 4px;
  text-align: center;
  font-size: 0.65rem;
  font-weight: 600;
  padding: 2px 6px;
  border-radius: 3px;
  background: rgba(0, 0, 0, 0.7);
  color: #9ca3af;
  letter-spacing: 0.02em;
}

.comparison-thumb.ours .method-badge {
  background: rgba(0, 191, 165, 0.8);
  color: #fff;
}

.comparison-thumb.gt .method-badge {
  background: rgba(34, 197, 94, 0.7);
  color: #fff;
}

/* ==================== Lightbox ==================== */
#lightbox.active {
  opacity: 1;
  pointer-events: auto;
}

/* ==================== Carousel ==================== */
.carousel-container {
  position: relative;
}

.carousel-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: #e5e7eb;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all var(--transition-base);
  font-size: 0.9rem;
}

.carousel-btn:hover {
  background: rgba(255, 255, 255, 0.18);
  transform: scale(1.1);
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
}

.carousel-dot.active {
  background: #00bfa5;
  box-shadow: 0 0 8px rgba(0, 191, 165, 0.5);
}

/* ==================== Comparison Slider ==================== */
.comparison-slider {
  cursor: ew-resize;
}

#slider-handle {
  transition: background 0.15s;
}

#slider-handle:active {
  background: #00bfa5;
}

/* ==================== Autho r Names ==================== */
.author-name {
  transition: all var(--transition-base);
  cursor: default;
}

.author-name:hover {
  color: #e5e7eb;
}

/* ==================== Prose / Abstract ==================== */
.prose-custom p {
  line-height: 1.8;
  color: #d1d5db;
}

/* ==================== Video Modal ==================== */
#video-modal.active {
  opacity: 1;
  pointer-events: auto;
}

/* ==================== BibTeX ==================== */
#bibtex-code {
  transition: all var(--transition-base);
}

/* ==================== Theme Toggle ==================== */
#theme-toggle i {
  transition: transform var(--transition-base);
}

#theme-toggle:hover i {
  transform: rotate(30deg);
}

/* ==================== Footer ==================== */
footer {
  background: transparent;
}

/* ==================== Responsive ==================== */
@media (max-width: 640px) {
  .glass-btn {
    padding: 0.6rem 1.1rem;
    font-size: 0.85rem;
  }

  .glass-card {
    border-radius: 0.75rem;
  }

  .glass-card.p-8 {
    padding: 1.25rem;
  }

  .glass-card.p-10 {
    padding: 1.25rem;
  }

  #bibtex-code {
    padding: 1rem;
    font-size: 0.7rem;
  }

  .carousel-btn {
    width: 36px;
    height: 36px;
    font-size: 0.75rem;
  }
}

/* ==================== Performance: Reduce motion ==================== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .animate-float,
  .animate-float-delayed,
  .animate-float-slow {
    animation: none;
  }
}