/* ── Tokens ──────────────────────────────────────────────────── */
:root {
  --bg: #020202;
  --bg-alt: #0a0a0a;
  --card: #111;
  --ink: #f5f5f5;
  --ink-soft: #dcdcdc;
  --muted: #999;
  --line: #1f1f1f;
  --accent: #6fb0ff;
  --accent-hover: #9ecbff;
  --radius: 6px;
  --max-w: 1000px;
  color-scheme: dark;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  background: var(--bg);
  color: var(--ink-soft);
  font-family: Jost, ui-sans-serif, system-ui, -apple-system, sans-serif;
  font-size: 15px;
  line-height: 1.65;
  overflow-x: hidden;
}

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

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}
a:hover { color: var(--accent-hover); }

h1, h2, h3, p, pre { overflow-wrap: anywhere; }

/* ── Navbar ──────────────────────────────────────────────────── */
.navbar {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(2, 2, 2, 0.92);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.nav-inner {
  width: min(var(--max-w), calc(100% - 48px));
  margin: 0 auto;
  min-height: 54px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  text-decoration: none;
}
.brand:hover { color: inherit; }

.brand-logo {
  height: 30px;
  width: auto;
  object-fit: contain;
}

.nav-links {
  display: flex;
  gap: 4px;
}

.nav-links a {
  padding: 6px 12px;
  border-radius: 6px;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
  transition: background 0.2s, color 0.2s;
}
.nav-links a:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--ink);
}

/* ── Hero ────────────────────────────────────────────────────── */
.hero {
  width: min(var(--max-w), calc(100% - 48px));
  margin: 0 auto;
  padding: 72px 0 56px;
  text-align: center;
}

.hero-eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 16px;
}

.hero-title {
  font-family: Jost, sans-serif;
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.05;
  letter-spacing: -0.01em;
}

.hero-subtitle {
  margin-top: 18px;
  font-size: 1.25em;
  color: var(--ink-soft);
  font-weight: 400;
  line-height: 1.45;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.hero-authors {
  margin-top: 22px;
  font-size: 1.05em;
  color: var(--ink);
  font-weight: 500;
}

.hero-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 22px;
  border: 1px solid #2e2e2e;
  border-radius: 6px;
  background: #1a1a1a;
  color: var(--ink-soft);
  font: inherit;
  font-size: 0.9em;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.btn:hover {
  background: #262626;
  border-color: #444;
  color: var(--ink);
}
.btn svg { flex-shrink: 0; }

/* ── Teaser ──────────────────────────────────────────────────── */
.teaser {
  width: min(var(--max-w), calc(100% - 48px));
  margin: 0 auto 60px;
}

.teaser-img {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

/* ── Sections ────────────────────────────────────────────────── */
.section {
  padding: 72px 0;
  border-top: 1px solid var(--line);
}

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

.container {
  width: min(var(--max-w), calc(100% - 48px));
  margin: 0 auto;
}

.section-title {
  font-family: Jost, sans-serif;
  font-size: 2em;
  font-weight: 500;
  color: var(--ink);
  text-align: center;
  margin-bottom: 8px;
}

.section-lead {
  text-align: center;
  color: var(--muted);
  font-size: 1.1em;
  margin-bottom: 36px;
}

/* ── Abstract ────────────────────────────────────────────────── */
.abstract-body {
  margin-top: 28px;
  font-size: 1.15em;
  line-height: 1.75;
  color: var(--ink-soft);
  text-align: justify;
}

.abstract-body p {
  margin-bottom: 18px;
}

/* ── Method ──────────────────────────────────────────────────── */
.method-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 12px;
}

.method-card {
  padding: 28px 24px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.step-num {
  display: block;
  font-size: 0.75em;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 0.04em;
  margin-bottom: 24px;
}

.method-card h3 {
  font-size: 1.1em;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 10px;
  line-height: 1.35;
}

.method-card p {
  font-size: 0.95em;
  color: var(--muted);
  line-height: 1.6;
}

/* ── Results ─────────────────────────────────────────────────── */
.results-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 12px;
}

.result-card {
  padding: 28px 24px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 4px;
  background: rgba(111, 176, 255, 0.1);
  color: var(--accent);
  font-size: 0.72em;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.result-num {
  font-size: 1.5em;
  font-weight: 700;
  color: var(--ink);
  margin: 16px 0 10px;
}

.result-card p {
  font-size: 0.95em;
  color: var(--muted);
  line-height: 1.6;
}

/* ── Carousel ────────────────────────────────────────────────── */
.carousel {
  position: relative;
  margin-top: 28px;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.carousel-track {
  position: relative;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #000;
  overflow: hidden;
}

.carousel-slide {
  width: 100%;
  position: absolute;
  top: 0;
  left: 0;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.4s ease;
}
.carousel-slide.active {
  position: relative;
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.carousel-slide video {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
}

.video-label {
  padding: 10px 0;
  text-align: center;
  color: var(--muted);
  font-size: 0.92em;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 42px;
  height: 42px;
  border: none;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
  z-index: 2;
  backdrop-filter: blur(6px);
}
.carousel-btn:hover {
  background: rgba(0, 0, 0, 0.8);
}
.carousel-prev { left: 12px; }
.carousel-next { right: 12px; }

.carousel-dots {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-top: 14px;
}

.carousel-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: none;
  background: rgba(255, 255, 255, 0.2);
  cursor: pointer;
  transition: background 0.2s;
  padding: 0;
}
.carousel-dot.active {
  background: var(--accent);
}
.carousel-dot:hover {
  background: rgba(255, 255, 255, 0.45);
}

/* ── Citation ────────────────────────────────────────────────── */
.citation-box {
  margin-top: 28px;
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.citation-box pre {
  flex: 1;
  margin: 0;
  padding: 20px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink-soft);
  font-size: 0.95em;
  line-height: 1.6;
  overflow: auto;
  font-family: "SF Mono", "Fira Code", "Fira Mono", monospace;
}

.citation-box .btn {
  flex-shrink: 0;
  margin-top: 2px;
}

/* ── Footer ──────────────────────────────────────────────────── */
.site-footer {
  width: min(var(--max-w), calc(100% - 48px));
  margin: 0 auto;
  padding: 28px 0 44px;
  border-top: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--muted);
  font-size: 0.85em;
}
.site-footer a {
  color: var(--muted);
  font-weight: 600;
}
.site-footer a:hover { color: var(--accent); }

/* ── Toast ───────────────────────────────────────────────────── */
.toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  padding: 10px 18px;
  border-radius: 6px;
  background: var(--ink);
  color: var(--bg);
  font-size: 0.88em;
  font-weight: 600;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
}
.toast.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ──────────────────────────────────────────────── */
@media (max-width: 860px) {
  .method-grid,
  .results-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .hero { padding: 48px 0 40px; }
  .hero-title { font-size: 2.2rem; }
  .hero-subtitle { font-size: 1.05em; }
  .section { padding: 52px 0; }
  .section-title { font-size: 1.6em; }

  .method-grid,
  .results-grid {
    grid-template-columns: 1fr;
  }

  .citation-box { flex-direction: column; }

  .carousel-btn {
    width: 34px;
    height: 34px;
  }
  .carousel-prev { left: 6px; }
  .carousel-next { right: 6px; }

  .site-footer {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}