/*
  UEC Project Page — Standalone CSS
  Palette & variables inherited from main portfolio site
*/

/* ======================================
   CSS VARIABLES
   ====================================== */

:root {
  --blue-deep: #003876;
  --blue-mid: #2D6A9F;
  --navy-dark: #0A1628;
  --teal: #1a5276;
  --gold: #C4A661;
  --gold-light: #E8DCC8;
  --bg-primary: #f8f9fa;
  --bg-warm: #faf8f5;
  --bg-white: #ffffff;
  --text-primary: #1a1a2e;
  --text-body: #3d3d4e;
  --text-muted: #6c757d;
  --border-light: rgba(0, 56, 118, 0.08);
  --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.1);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark theme overrides */
html[data-theme="dark"] {
  --bg-primary: #0f1b2e;
  --bg-warm: #0a1628;
  --bg-white: #142847;
  --text-primary: #e8eaed;
  --text-body: #c4cbd4;
  --text-muted: #8b94a3;
  --blue-deep: #5a9fdb;
  --blue-mid: #4a7fb8;
  --teal: #5fae9e;
  --gold: #d4b97a;
  --gold-light: #2a2417;
  --navy-dark: #050d1a;
  --border-light: rgba(196, 166, 97, 0.12);
  --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.45);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.55);
}

/* ======================================
   GLOBAL STYLES
   ====================================== */

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-warm);
  color: var(--text-body);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-family: var(--font-display);
  font-weight: 400;
}

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

a {
  color: var(--blue-deep);
  transition: all var(--transition);
}

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

/* ======================================
   CONTAINER
   ====================================== */

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ======================================
   SCROLL REVEAL
   ====================================== */

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ======================================
   HEADER
   ====================================== */

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 900px;
  margin: 0 auto;
  padding: 20px 24px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
}

.back-link:hover {
  color: var(--blue-deep);
}

/* ======================================
   THEME TOGGLE
   ====================================== */

.theme-toggle {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.theme-toggle:hover {
  background: var(--border-light);
}

.theme-icon {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  transition: color var(--transition);
}

/* Light mode: show moon, hide sun */
.theme-icon--sun {
  display: none;
}

.theme-icon--moon {
  display: block;
}

/* Dark mode: show sun, hide moon */
html[data-theme="dark"] .theme-icon--sun {
  display: block;
}

html[data-theme="dark"] .theme-icon--moon {
  display: none;
}

/* ======================================
   HERO
   ====================================== */

.hero {
  background: linear-gradient(135deg, var(--blue-deep), var(--teal));
  color: #ffffff;
  text-align: center;
  padding: 64px 24px 56px;
  border-radius: var(--radius-lg);
  margin: 0 auto 48px;
  max-width: 900px;
}

.venue-badge {
  display: inline-block;
  background: var(--gold);
  color: var(--navy-dark);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  padding: 5px 16px;
  border-radius: 999px;
  margin-bottom: 20px;
  text-transform: uppercase;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: 2.4rem;
  font-weight: 400;
  color: #ffffff;
  line-height: 1.25;
  margin: 0 0 20px;
}

.authors {
  font-size: 1.05rem;
  margin-bottom: 6px;
  opacity: 0.95;
}


.affiliation {
  font-size: 0.9rem;
  opacity: 0.8;
  margin-bottom: 28px;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 24px;
}

.hero-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 22px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.25);
  transition: all var(--transition);
}

.hero-btn:hover {
  background: rgba(255, 255, 255, 0.28);
  color: #ffffff;
  transform: translateY(-1px);
}

.hero-btn svg {
  width: 16px;
  height: 16px;
}

/* ======================================
   SECTIONS
   ====================================== */

.page-section {
  margin-bottom: 56px;
}

.page-section h2 {
  font-size: 1.7rem;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--border-light);
}

/* ======================================
   ABSTRACT
   ====================================== */

.abstract-text {
  border-left: 3px solid var(--gold);
  padding: 16px 0 16px 24px;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-body);
}

/* ======================================
   PDF VIEWER
   ====================================== */

.pdf-viewer {
  position: relative;
}

.pdf-canvas-wrapper {
  position: relative;
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  outline: none;
}

.pdf-canvas-wrapper:focus-visible {
  box-shadow: var(--shadow-md), 0 0 0 3px var(--gold);
}

.pdf-canvas-wrapper canvas {
  display: block;
  max-width: 100%;
  height: auto;
}

.pdf-loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.9rem;
  font-family: var(--font-mono);
  pointer-events: none;
}

.pdf-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
  margin-top: 20px;
}

.pdf-download-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  font-weight: 500;
  text-decoration: none;
  background: var(--blue-deep);
  color: #ffffff;
  border: 1px solid var(--blue-deep);
  transition: all var(--transition);
  box-shadow: var(--shadow-sm);
}

.pdf-download-btn:hover {
  background: var(--gold);
  color: var(--navy-dark);
  border-color: var(--gold);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.pdf-download-btn svg {
  width: 16px;
  height: 16px;
}

/* ======================================
   METHOD FIGURE
   ====================================== */

.method-figure {
  text-align: center;
  margin: 0;
}

.method-figure img {
  background: var(--bg-white);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  border-radius: var(--radius-md);
  max-width: 100%;
}

.method-figure figcaption {
  margin-top: 12px;
  font-size: 0.9rem;
  color: var(--text-muted);
  text-align: center;
}

/* ======================================
   KEY RESULTS
   ====================================== */

.results-carousel {
  position: relative;
}

.carousel-track {
  position: relative;
}

.result-slide {
  display: none;
  text-align: center;
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.result-slide.active {
  display: block;
}

.result-slide img {
  width: 100%;
  display: block;
  padding: 16px;
  background: var(--bg-white);
}

.result-slide figcaption {
  padding: 16px 24px 20px;
  font-size: 0.95rem;
  color: var(--text-body);
  line-height: 1.6;
}

.result-slide figcaption strong {
  display: block;
  color: var(--text-primary);
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.carousel-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-top: 20px;
}

.carousel-btn {
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 1.2rem;
  width: 44px;
  height: 44px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-sm);
}

.carousel-btn:hover {
  background: var(--blue-deep);
  color: #fff;
  box-shadow: var(--shadow-md);
}

.carousel-indicator {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  min-width: 50px;
  text-align: center;
}

/* ======================================
   BIBTEX
   ====================================== */

.bibtex-wrapper {
  position: relative;
  background: var(--bg-white);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.bibtex-wrapper pre {
  margin: 0;
  padding: 20px 24px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  overflow-x: auto;
  color: var(--text-body);
}

.copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--gold);
  color: var(--navy-dark);
  border: none;
  border-radius: var(--radius-sm);
  padding: 6px 14px;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
}

.copy-btn:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

/* ======================================
   FOOTER
   ====================================== */

.site-footer {
  background: var(--navy-dark);
  color: rgba(255, 255, 255, 0.7);
  text-align: center;
  padding: 36px 24px;
  font-size: 0.88rem;
  margin-top: 64px;
}

.site-footer a {
  color: var(--gold);
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--gold-light);
  text-decoration: underline;
}

/* ======================================
   RESPONSIVE
   ====================================== */

@media (max-width: 768px) {
  .hero {
    padding: 44px 18px 40px;
    border-radius: var(--radius-md);
  }

  .hero h1 {
    font-size: 1.6rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .hero-btn {
    width: 100%;
    max-width: 280px;
    justify-content: center;
  }


  .container {
    padding: 0 16px;
  }

  .site-header {
    padding: 16px;
  }

  .page-section h2 {
    font-size: 1.4rem;
  }
}