@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@500;600;700;800&family=Fira+Code:wght@400;500&display=swap');

:root {
  --primary-color: #4F46E5;
  --primary-hover: #4338CA;
  --primary-light: rgba(79, 70, 229, 0.08);
  --primary-border: rgba(79, 70, 229, 0.25);
  --accent-gradient: linear-gradient(135deg, #4F46E5 0%, #7C3AED 50%, #EC4899 100%);
  
  --bg-color: #F8FAFC;
  --bg-card: #FFFFFF;
  --text-main: #0F172A;
  --text-body: #334155;
  --text-muted: #64748B;
  
  --border-color: #E2E8F0;
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.025);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.08);
  
  --radius-xl: 20px;
  --radius-lg: 14px;
  --radius-md: 10px;
  --radius-sm: 6px;
  --radius-full: 9999px;
  
  --max-width: 1040px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: all 0.2s ease;
}

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

/* Sticky Navbar */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
}

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

.site-nav-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-main);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background: var(--primary-light);
  transition: all 0.2s ease;
}

.site-nav-back:hover {
  background: var(--primary-color);
  color: #FFFFFF;
  transform: translateX(-3px);
}

.site-nav-links {
  display: flex;
  gap: 1.25rem;
}

.site-nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
}

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

/* Main Container */
.paper-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
}

/* Hero Section */
.paper-hero {
  text-align: center;
  margin-bottom: 3.5rem;
}

.venue-pill {
  display: inline-block;
  background: var(--accent-gradient);
  color: #FFFFFF;
  font-family: 'Outfit', sans-serif;
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  padding: 5px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 1.25rem;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.paper-title {
  font-family: 'Outfit', sans-serif;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
  line-height: 1.25;
  margin: 0 0 1.5rem;
  letter-spacing: -0.03em;
}

@media (max-width: 768px) {
  .paper-title {
    font-size: 1.85rem;
  }
}

.paper-authors {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem 1.75rem;
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
}

.author-item {
  display: inline-block;
}

.author-item a {
  color: var(--text-main);
  font-weight: 500;
}

.author-item a:hover {
  color: var(--primary-color);
}

.author-highlighted {
  color: var(--primary-color) !important;
  font-weight: 700 !important;
  text-decoration: underline;
  text-decoration-color: rgba(79, 70, 229, 0.4);
  text-underline-offset: 4px;
}

.paper-affiliations {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.5rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.affiliation-item a {
  color: var(--text-muted);
}

.affiliation-item a:hover {
  color: var(--primary-color);
}

/* Button Dock */
.button-dock {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 2.5rem;
}

.dock-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.55rem 1.35rem;
  border-radius: var(--radius-full);
  font-size: 0.92rem;
  font-weight: 600;
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
  cursor: pointer;
}

.dock-btn:hover {
  background: var(--primary-color);
  color: #FFFFFF !important;
  border-color: var(--primary-color);
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.3);
}

.dock-btn-primary {
  background: var(--primary-color);
  color: #FFFFFF;
  border-color: var(--primary-color);
}

.dock-btn-primary:hover {
  background: var(--primary-hover);
  color: #FFFFFF;
}

/* Window Cards (Modular Windows) */
.window-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  margin-bottom: 2.5rem;
  transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.window-card:hover {
  box-shadow: var(--shadow-md);
  border-color: rgba(79, 70, 229, 0.3);
}

.window-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.5rem;
  background: rgba(248, 250, 252, 0.8);
  border-bottom: 1px solid var(--border-color);
}

.window-dots {
  display: flex;
  gap: 6px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot-red { background: #EF4444; }
.dot-yellow { background: #F59E0B; }
.dot-green { background: #10B981; }

.window-title {
  font-family: 'Outfit', sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-main);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.window-body {
  padding: 2rem;
}

@media (max-width: 768px) {
  .window-body {
    padding: 1.25rem;
  }
}

.window-body h2, .window-body h3 {
  font-family: 'Outfit', sans-serif;
  color: var(--text-main);
  margin-top: 0;
  margin-bottom: 1rem;
}

.window-body h2 {
  font-size: 1.6rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.window-body h3 {
  font-size: 1.25rem;
  margin-top: 1.75rem;
}

/* Video Player Showcase */
.video-showcase-container {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #000000;
  position: relative;
  box-shadow: var(--shadow-md);
}

.video-showcase-container video {
  width: 100%;
  display: block;
  max-height: 520px;
  object-fit: contain;
  background: #000;
}

.video-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0.75rem 1rem;
  background: #111827;
  border-top: 1px solid #1F2937;
}

.video-tab-btn {
  background: #1F2937;
  color: #94A3B8;
  border: 1px solid #374151;
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.video-tab-btn:hover {
  color: #FFFFFF;
  background: #374151;
}

.video-tab-btn.active {
  background: var(--primary-color);
  color: #FFFFFF;
  border-color: var(--primary-color);
}

/* Key Contributions Grid */
.contributions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.contribution-card {
  background: #F8FAFC;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  transition: transform 0.2s ease;
}

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

.contribution-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--primary-light);
  color: var(--primary-color);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
}

.contribution-card h4 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  color: var(--text-main);
}

.contribution-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Figure & Image Windows */
.figure-window {
  margin: 1.75rem 0;
  text-align: center;
}

.figure-window img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
}

.figure-caption {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
  line-height: 1.5;
}

/* Equations Box */
.math-box {
  background: #F8FAFC;
  border-left: 4px solid var(--primary-color);
  padding: 1rem 1.5rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: 1.25rem 0;
  overflow-x: auto;
}

/* BibTeX Code Window */
.bibtex-box {
  position: relative;
  background: #0F172A;
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.bibtex-copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  background: rgba(255, 255, 255, 0.1);
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.bibtex-copy-btn:hover {
  background: var(--primary-color);
  border-color: var(--primary-color);
}

.bibtex-box pre {
  margin: 0;
  color: #E2E8F0;
  font-family: 'Fira Code', monospace;
  font-size: 0.85rem;
  line-height: 1.5;
  overflow-x: auto;
}

/* Footer */
.paper-footer {
  text-align: center;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
  margin-top: 4rem;
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* Toast */
.copy-toast {
  position: fixed;
  bottom: 25px;
  right: 25px;
  background: #0F172A;
  color: #FFFFFF;
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-size: 0.88rem;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 8px;
  z-index: 99999;
  opacity: 0;
  transform: translateY(15px);
  transition: all 0.3s ease;
  pointer-events: none;
}

.copy-toast.show {
  opacity: 1;
  transform: translateY(0);
}

/* Dark Mode support */
@media (prefers-color-scheme: dark) {
  body.auto-dark {
    --bg-color: #0B0F19;
    --bg-card: #111827;
    --text-main: #F8FAFC;
    --text-body: #CBD5E1;
    --text-muted: #94A3B8;
    --border-color: rgba(255, 255, 255, 0.08);
    --primary-color: #818CF8;
    --primary-hover: #A5B4FC;
    --primary-light: rgba(129, 140, 248, 0.12);
  }
}

body.dark {
  --bg-color: #0B0F19;
  --bg-card: #111827;
  --text-main: #F8FAFC;
  --text-body: #CBD5E1;
  --text-muted: #94A3B8;
  --border-color: rgba(255, 255, 255, 0.08);
  --primary-color: #818CF8;
  --primary-hover: #A5B4FC;
  --primary-light: rgba(129, 140, 248, 0.12);
}

body.dark .site-nav {
  background: rgba(11, 15, 25, 0.88);
}

body.dark .window-header {
  background: rgba(17, 24, 39, 0.9);
}

body.dark .contribution-card,
body.dark .math-box {
  background: #1E293B;
  border-color: rgba(255, 255, 255, 0.08);
}

body.dark .dock-btn {
  background: #1E293B;
  color: #F8FAFC;
  border-color: rgba(255, 255, 255, 0.1);
}