/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', 'Segoe UI', sans-serif;
  font-size: 1.05rem;
  line-height: 1.7;
  color: #2D1B1B;
  background: #FFF5F5;
}
h1, h2, h3, h4 { font-family: 'Playfair Display', Georgia, serif; font-weight: 700; line-height: 1.3; }
h2 { font-size: 1.85rem; margin-bottom: 1.2rem; color: #9B2C2C; }
h3 { font-size: 1.35rem; margin: 2rem 0 0.8rem; color: #2D1B1B; }
h4 { font-size: 1.15rem; margin-bottom: 0.5rem; }
p { margin-bottom: 1rem; }
a { color: #2C7A7B; text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }
ul, ol { margin: 0.5rem 0 1rem 1.5rem; }
li { margin-bottom: 0.4rem; }

/* === Layout === */
.container { max-width: 900px; margin: 0 auto; padding: 0 1.5rem; }
.section { padding: 4rem 0; }
.section-alt { background: #F5E0E0; }

/* === Hero === */
.hero { position: relative; min-height: 420px; display: flex; align-items: center; justify-content: center; overflow: hidden; }
.hero-bg { position: absolute; inset: 0; background: url('./assets/hero_bg.png') center/cover no-repeat; z-index: 0; }
.hero-overlay { position: absolute; inset: 0; background: rgba(45,27,27,0.82); z-index: 1; }
.hero-content { position: relative; z-index: 2; max-width: 900px; padding: 3rem 1.5rem; text-align: center; color: #fff; }
.hero h1 { font-size: 2.5rem; font-weight: 900; margin-bottom: 1rem; }
.hero-subtitle { font-size: 1.15rem; opacity: 0.92; margin-bottom: 1rem; max-width: 700px; margin-left: auto; margin-right: auto; }
.hero-authors { font-size: 0.9rem; opacity: 0.75; margin-bottom: 1.5rem; }
.hero-badges { display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center; margin-bottom: 1.5rem; }
.chip { background: rgba(44,122,123,0.85); color: #fff; padding: 4px 14px; border-radius: 20px; font-size: 0.8rem; font-weight: 600; letter-spacing: 0.02em; }
.hero-actions { display: flex; gap: 1rem; justify-content: center; }
.btn { display: inline-block; background: #2C7A7B; color: #fff; padding: 10px 24px; border-radius: 8px; font-weight: 600; font-size: 0.95rem; transition: background 0.2s; }
.btn:hover { background: #285E61; text-decoration: none; }

/* === Abstract === */
.abstract-card { background: #fff; border-left: 4px solid #2C7A7B; border-radius: 0 12px 12px 0; padding: 1.5rem 2rem; margin-bottom: 2rem; box-shadow: 0 2px 12px rgba(0,0,0,0.06); font-size: 1.08rem; }
.metrics-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-bottom: 2rem; }
.metric-card { background: #fff; border-radius: 12px; padding: 1.5rem 1rem; text-align: center; box-shadow: 0 2px 12px rgba(0,0,0,0.06); transition: transform 0.2s, box-shadow 0.2s; }
.metric-card:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(0,0,0,0.1); }
.metric-number { display: block; font-family: 'Playfair Display', Georgia, serif; font-size: 2.2rem; font-weight: 900; color: #9B2C2C; }
.metric-label { display: block; font-size: 0.82rem; color: #A08080; margin-top: 0.3rem; font-weight: 500; }
.keywords-area { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.keyword-badge { background: #F5E0E0; color: #9B2C2C; padding: 4px 14px; border-radius: 20px; font-size: 0.82rem; font-weight: 500; }

/* === Figures === */
figure { margin: 2rem auto; max-width: 700px; text-align: center; }
figure img { border-radius: 8px; border: 1px solid #E8D8D8; margin: 0 auto; }
figcaption { font-size: 0.88rem; color: #A08080; margin-top: 0.8rem; line-height: 1.5; }
.figure-wide { max-width: 100%; }
.figure-wide img { max-width: 100%; }
.table-figure { max-width: 100%; }
.table-figure img { max-width: 100%; border-radius: 8px; }
.figure-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin: 2rem 0; }
.figure-pair figure { margin: 0; max-width: 100%; }

/* === Challenge Cards === */
.challenge-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; margin-top: 2rem; }
.challenge-card { background: #fff; border-radius: 12px; padding: 1.5rem; border-left: 4px solid #9B2C2C; box-shadow: 0 2px 12px rgba(0,0,0,0.06); transition: transform 0.2s; }
.challenge-card:hover { transform: translateY(-2px); }
.challenge-card h4 { color: #9B2C2C; }

/* === Modality / Target / AI Cards === */
.modality-grid, .target-grid, .ai-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 1.5rem; margin-top: 2rem; }
.modality-card, .target-card, .ai-card { background: #fff; border-radius: 12px; padding: 1.5rem; box-shadow: 0 2px 12px rgba(0,0,0,0.06); border-top: 3px solid #2C7A7B; transition: transform 0.2s; }
.modality-card:hover, .target-card:hover, .ai-card:hover { transform: translateY(-2px); }
.modality-card h4, .target-card h4, .ai-card h4 { color: #2C7A7B; }

/* === Conclusion Callout === */
.conclusion-callout { background: #D8ECEC; border-radius: 12px; padding: 2rem; margin-top: 2rem; border-left: 4px solid #2C7A7B; }
.conclusion-callout p { font-size: 1.1rem; margin: 0; }

/* === Abbreviations & References === */
details { margin: 1rem 0; }
summary { cursor: pointer; font-family: 'Playfair Display', Georgia, serif; font-size: 1.5rem; font-weight: 700; color: #9B2C2C; padding: 0.5rem 0; }
summary:hover { opacity: 0.8; }
.abbr-badges { display: flex; flex-wrap: wrap; gap: 0.5rem; padding: 1rem 0; }
.abbr-badge { background: #F5E0E0; color: #2D1B1B; padding: 6px 14px; border-radius: 20px; font-size: 0.82rem; font-family: 'Inter', sans-serif; }
.ref-note { font-size: 0.9rem; color: #A08080; padding: 1rem 0; }

/* === Flecto Explanation UI === */
.flecto-note, .flecto-callout, .flecto-card, .flecto-panel {
  position: relative;
  margin: 1.5rem 0;
  border-radius: 10px;
  font-size: 0.98rem;
}
.flecto-note::before, .flecto-callout::before, .flecto-card::before, .flecto-panel::before {
  content: "\1F916 AI explanation";
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  color: #60a5fa;
  letter-spacing: 0.06em;
  display: block;
  margin-bottom: 0.5em;
}
.flecto-note {
  background: #FFF5F5;
  border-left: 3px solid #2C7A7B;
  padding: 0.8rem 1rem;
  font-size: 0.92rem;
}
.flecto-callout {
  background: #D8ECEC;
  padding: 1.2rem 1.5rem;
  border-radius: 10px;
}
.flecto-card {
  background: #fff;
  border: 1px solid #E8D8D8;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  padding: 1.5rem;
}
.flecto-panel {
  background: #fff;
  border: 1px solid #E8D8D8;
  box-shadow: 0 3px 12px rgba(0,0,0,0.07);
  padding: 2rem;
}

/* === Reveal Animation === */
.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* === Responsive === */
@media (max-width: 768px) {
  .hero h1 { font-size: 1.8rem; }
  h2 { font-size: 1.5rem; }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .challenge-grid { grid-template-columns: 1fr; }
  .figure-pair { grid-template-columns: 1fr; }
  .container { padding: 0 1rem; }
  .section { padding: 2.5rem 0; }
}