/* === dataset.css === */
/* Scoped styles for AD4CHE/VRUD dataset detail pages. */
/* Loaded ALONGSIDE style.css. Variables scoped to body.dataset-page */
/* so they never leak into the main lab pages. */

body.dataset-page {
  /* Dataset-page-local helper palette. Match lab's warm-cream main page  */
  /* so the navy lab logo stays legible. --bg/--text/--accent/--border    */
  /* are inherited from style.css :root.                                   */
  --blue: #3d6b8e;
  --gray-50: #f4f3ef;
  --gray-100: #eae9e4;
  --gray-200: #e0ded6;
  --gray-400: #8a8880;
  --gray-600: #5a5850;
  --gray-800: #2a2925;
  --shadow: 0 4px 24px rgba(0,0,0,0.06);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.1);

  background: var(--bg);
}

/* Inherit lab-nav default (white bg + dark text). Don't override. */

/* ---------- Buttons ---------- */
.dataset-page .btn { display: inline-block; padding: 12px 28px; font-size: 15px; font-weight: 600; border-radius: 6px; transition: all 0.2s; cursor: pointer; text-decoration: none; }
.dataset-page .btn-primary { background: var(--accent); color: #fff; }
.dataset-page .btn-primary:hover { background: #b04e30; color: #fff; transform: translateY(-1px); }
.dataset-page .btn-outline-dark { border: 1.5px solid var(--border); color: var(--text); background: var(--card-bg); }
.dataset-page .btn-outline-dark:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Hero (light, matches lab main page) ---------- */
.dataset-hero {
  position: relative;
  background:
    radial-gradient(ellipse 65% 45% at 50% 0%, var(--accent-glow, rgba(200,90,58,0.10)), transparent 70%),
    var(--bg);
  padding: 112px 24px 36px;
  text-align: center;
  color: var(--text);
  overflow: hidden;
}
.dataset-hero-inner { position: relative; z-index: 1; max-width: 880px; margin: 0 auto; }
/* Subtitle — sits one line above h1, formal full descriptive name. */
/* Bigger than the old eyebrow tag; readable for CN, no uppercase.  */
.dataset-subtitle { font-size: clamp(15px, 1.6vw, 18px); font-weight: 500; color: var(--accent); line-height: 1.5; margin: 0 auto 14px; max-width: 760px; letter-spacing: 0; }
.dataset-hero h1 { font-size: clamp(36px, 6vw, 56px); font-weight: 700; color: var(--text); line-height: 1.1; margin-bottom: 14px; letter-spacing: -0.5px; }
.dataset-tagline { font-size: 16px; color: var(--muted); line-height: 1.65; margin: 0 auto; max-width: 720px; }

/* ---------- Video (continues hero bg + glow tail for seamless transition) ---------- */
.dataset-video-section {
  background:
    radial-gradient(ellipse 80% 40% at 50% 100%, var(--accent-glow, rgba(200,90,58,0.06)), transparent 70%),
    var(--bg);
  padding: 0 24px 80px;
}
.dataset-video-frame { max-width: 1040px; margin: 0 auto; }
.dataset-video { width: 100%; display: block; border-radius: var(--radius); aspect-ratio: 16 / 9; background: #000; box-shadow: 0 16px 48px rgba(0,0,0,0.12); }
.dataset-video-caption { text-align: center; font-size: 13px; color: var(--muted); margin-top: 14px; font-style: italic; }

/* ---------- Section frame ---------- */
/* Three-tier rhythm: card-bg (white) → bg-alt (deep cream) → card-bg → ...   */
/* Each section gets clear visual separation. h2 sub-line is gradient accent.  */
.dataset-section { padding: 80px 0; background: var(--card-bg); }
.dataset-section-alt { background: var(--bg-deep, #ede9e0); }
.dataset-section h2 {
  position: relative;
  font-size: clamp(26px, 3.4vw, 32px); font-weight: 700; color: var(--text);
  text-align: center; letter-spacing: -0.3px; margin-bottom: 18px;
  padding-bottom: 14px;
}
.dataset-section h2::after {
  content: ""; position: absolute; left: 50%; bottom: 0;
  width: 64px; height: 2px;
  background: linear-gradient(to right, transparent, var(--accent), transparent);
  transform: translateX(-50%);
  opacity: 0.7;
}
.dataset-section .lede { text-align: center; color: var(--muted); font-size: 15px; max-width: 720px; margin: 0 auto 48px; line-height: 1.7; }
.dataset-section .container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }

/* ---------- Overview cards ---------- */
.dataset-overview-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; max-width: 1080px; margin: 0 auto; }
.dataset-overview-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px 28px; transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s; }
.dataset-overview-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--accent); }
.dataset-section-alt .dataset-overview-card { background: var(--card-bg); }
.dataset-overview-card h3 { font-size: 17px; font-weight: 700; color: var(--text); margin-bottom: 12px; padding-bottom: 10px; border-bottom: 2px solid var(--accent); }
.dataset-overview-card p { font-size: 14px; color: var(--muted); line-height: 1.7; }
.dataset-overview-card p strong { color: var(--text); }

/* ---------- Stats ---------- */
.dataset-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; max-width: 1080px; margin: 0 auto; }
.dataset-stat { text-align: center; padding: 32px 16px; background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); transition: transform 0.3s, box-shadow 0.3s; }
.dataset-stat:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.dataset-section-alt .dataset-stat { background: var(--card-bg); }
.dataset-stat-num { font-size: 32px; font-weight: 700; color: var(--accent); line-height: 1.1; margin-bottom: 8px; letter-spacing: -0.5px; }
.dataset-stat-label { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; color: var(--muted); }

/* ---------- Included ---------- */
.dataset-included { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; max-width: 920px; margin: 0 auto; }
.dataset-included-col h3 { font-size: 15px; font-weight: 700; color: var(--text); margin-bottom: 14px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.dataset-included-col ul { list-style: none; padding: 0; margin: 0; }
.dataset-included-col li { padding: 6px 0 6px 18px; font-size: 14px; color: var(--muted); line-height: 1.6; position: relative; }
.dataset-included-col li::before { content: ''; position: absolute; left: 0; top: 14px; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

/* ---------- Citation ---------- */
.dataset-citation { max-width: 760px; margin: 0 auto; padding: 28px 32px; background: var(--card-bg); border: 1px solid var(--border); border-left: 4px solid var(--accent); border-radius: var(--radius); }
.citation-title { font-size: 17px; font-weight: 600; color: var(--text); line-height: 1.5; margin-bottom: 6px; }
.citation-meta { font-size: 14px; color: var(--muted); margin-bottom: 18px; line-height: 1.6; }
.citation-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* ---------- Form ---------- */
.dataset-form { max-width: 720px; margin: 0 auto; background: var(--card-bg); padding: 40px; border-radius: var(--radius); border: 1px solid var(--border); box-shadow: var(--shadow); }
.dataset-form label { display: block; font-size: 13px; font-weight: 600; color: var(--text); margin-bottom: 18px; }
.dataset-form .req { color: var(--accent); }
.dataset-form input[type="text"],
.dataset-form input[type="email"],
.dataset-form select,
.dataset-form textarea { display: block; width: 100%; margin-top: 6px; padding: 11px 14px; font: inherit; font-size: 14px; font-weight: 400; color: var(--text); background: var(--card-bg); border: 1px solid var(--border); border-radius: 8px; transition: border-color 0.2s, box-shadow 0.2s; }
.dataset-form input:focus,
.dataset-form select:focus,
.dataset-form textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(200,90,58,0.12); }
.dataset-form textarea { min-height: 100px; resize: vertical; line-height: 1.55; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-row > label { margin-bottom: 0; }
.form-check { display: flex; gap: 10px; align-items: flex-start; font-weight: 400; color: var(--muted); font-size: 13px; line-height: 1.55; margin: 8px 0 18px; }
.form-check input[type="checkbox"] { margin-top: 3px; flex-shrink: 0; accent-color: var(--accent); width: 16px; height: 16px; }
.form-honeypot { position: absolute !important; left: -10000px; top: auto; width: 1px; height: 1px; overflow: hidden; }
.form-submit { width: 100%; border: none; cursor: pointer; padding: 14px 28px; font-size: 15px; background: var(--accent); color: #fff; }
.form-submit:hover { background: #b04e30; }
.form-status { margin-top: 14px; font-size: 13px; min-height: 20px; line-height: 1.5; text-align: center; }
.form-status.success { color: #2a7a3f; }
.form-status.error { color: var(--accent); }
.form-meta { text-align: center; margin-top: 20px; font-size: 13px; color: var(--muted); }
.form-meta a { color: var(--accent); }
.form-hint { display: block; margin-top: 6px; font-size: 12px; font-weight: 400; color: var(--gray-400); line-height: 1.5; }

/* ---------- CTA (Feishu form jump button) ---------- */
.dataset-cta { max-width: 620px; margin: 0 auto; text-align: center; padding: 32px 24px; background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.dataset-cta-hint { font-size: 15px; color: var(--text); line-height: 1.7; margin: 0 0 22px; }
.dataset-cta-meta { display: inline-block; margin-top: 8px; font-size: 13px; color: var(--muted); line-height: 1.55; }
.dataset-cta-btn { font-size: 16px; padding: 14px 36px; box-shadow: 0 6px 18px rgba(200,90,58,0.18); }
.dataset-cta-btn:hover { box-shadow: 0 10px 24px rgba(200,90,58,0.25); }
.dataset-cta-fallback { font-size: 13px; color: var(--muted); margin: 22px 0 0; }
.dataset-cta-fallback a { color: var(--accent); }

/* ---------- Related ---------- */
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; max-width: 980px; margin: 0 auto; }
.related-card { display: block; padding: 24px; background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); transition: transform 0.3s, box-shadow 0.3s; color: inherit; text-decoration: none; }
.related-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); color: inherit; border-color: var(--accent); }
.related-card h3 { font-size: 17px; font-weight: 700; color: var(--text); margin-bottom: 6px; }
.related-card p { font-size: 13px; color: var(--muted); line-height: 1.55; }
.related-card .arrow { display: inline-block; margin-top: 12px; font-size: 13px; font-weight: 600; color: var(--accent); }

/* ---------- Footer ---------- */
.dataset-footer {
  background: var(--bg);
  color: var(--muted);
  padding: 40px 24px;
  text-align: center;
  font-size: 13px;
  border-top: 2px solid;
  border-image: linear-gradient(to right, transparent, var(--accent), transparent) 1;
}
.dataset-footer a { color: var(--text); text-decoration: none; }
.dataset-footer a:hover { color: var(--accent); }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .dataset-overview-cards { grid-template-columns: 1fr; }
  .dataset-stats { grid-template-columns: repeat(2, 1fr); }
  .related-grid { grid-template-columns: 1fr; }
  .dataset-included { grid-template-columns: 1fr; gap: 28px; }
}
@media (max-width: 640px) {
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .dataset-form { padding: 28px 20px; }
  .dataset-hero { padding: 100px 18px 28px; }
}