/* ============================================================
   The Geophysical Lithosphere — faithful clone of lithomagdens.cn
   Design tokens captured from the original site's Tailwind theme.
   ============================================================ */

:root {
  --primary: #17766b;          /* teal-green */
  --primary-dark: #0e5a51;
  --primary-light: #e3f1ef;
  --ink: #16302c;              /* dark text */
  --sub: #6b7a77;              /* secondary text */
  --body: #3d4a48;
  --panel: #ffffff;
  --surface: #f7f9fa;
  --line: #d8e2e0;
  --accent: #7fc8a9;
  --highlight: #f2f7f6;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--body);
  background: #ffffff;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 20px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 40;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 6px;
  background: var(--primary); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 13px;
}
.brand-globe { width: 20px; height: 20px; display: block; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-weight: 700; color: var(--ink); font-size: 15px; letter-spacing: -0.01em; }
.brand-tag { font-size: 11px; color: var(--primary); letter-spacing: 0.05em; }

.main-nav { display: flex; align-items: center; gap: 6px; }
.main-nav a {
  padding: 8px 12px; border-radius: 6px;
  font-size: 14px; font-weight: 500; color: var(--body);
  transition: color .2s, background .2s;
}
.main-nav a:hover { color: var(--primary); background: var(--primary-light); }
.main-nav a.active { color: var(--primary); font-weight: 600; }

.nav-toggle { display: none; background: none; border: 0; font-size: 22px; color: var(--ink); cursor: pointer; }

/* ---------- Hero ---------- */
.hero { position: relative; }
.hero-bg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.hero-overlay { position: absolute; inset: 0; background: rgba(10,26,24,0.45); }
.hero-content {
  position: relative; max-width: 1120px; margin: 0 auto;
  padding: 96px 20px 144px; text-align: center; color: #fff;
}
.hero-eyebrow {
  font-size: 13px; font-weight: 600; letter-spacing: 0.25em;
  text-transform: uppercase; color: #fff;
}
.hero h1 {
  margin-top: 20px; font-size: 36px; font-weight: 700;
  color: #fff; letter-spacing: -0.02em; line-height: 1.1;
}
.hero-lead {
  margin: 24px auto 0; font-size: 16px; line-height: 1.75;
  color: #fff; max-width: 760px;
}
.hero-actions { margin-top: 36px; display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; }
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 12px 28px; border-radius: 4px;
  font-size: 15px; font-weight: 600; cursor: pointer;
  transition: background .2s, transform .2s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); }
.btn-ghost { border: 1px solid rgba(255,255,255,0.5); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,0.1); transform: translateY(-2px); }
.btn-outline { background: var(--primary-light); color: var(--primary-dark); }
.btn-outline:hover { background: #d2e8e5; }

/* ---------- Section ---------- */
.section { padding: 64px 0 80px; }
.section--alt { background: var(--primary-light); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-head { text-align: center; margin-bottom: 40px; }
.section-head h2 { font-size: 26px; font-weight: 700; color: var(--ink); letter-spacing: -0.01em; }
.section-head p { margin-top: 12px; font-size: 15px; color: var(--sub); max-width: 640px; margin-left: auto; margin-right: auto; }

/* ---------- Model cards (home) ---------- */
.card-grid { display: grid; gap: 24px; grid-template-columns: repeat(2, 1fr); align-items: stretch; }
.card {
  display: flex; flex-direction: column; background: var(--panel); border: 1px solid var(--line);
  border-radius: 4px; overflow: hidden;
  box-shadow: 0 1px 3px rgba(22,48,44,0.08);
  transition: box-shadow .25s, transform .25s;
}
.card:hover { box-shadow: 0 6px 18px rgba(22,48,44,0.12); transform: translateY(-4px); }
.card-thumb { overflow: hidden; }
.card-thumb img { width: 100%; height: auto; display: block; transition: transform .5s; }
.card:hover .card-thumb img { transform: scale(1.03); }
.card-body { padding: 24px; display: flex; flex-direction: column; flex: 1; }
.card-type { display: flex; align-items: center; color: var(--primary); }
.card-icon { width: 20px; height: 20px; display: block; }
.card h3 { margin-top: 10px; font-size: 20px; font-weight: 700; color: var(--ink); line-height: 1.3; }
.card:hover h3 { color: var(--primary); }
.card p { margin-top: 10px; font-size: 14px; line-height: 1.6; color: var(--sub); }
.card-link { margin-top: auto; padding-top: 16px; display: inline-flex; align-items: center; gap: 8px; font-size: 14px; font-weight: 600; color: var(--primary); }
.card-link .arrow { transition: transform .2s; }
.card:hover .card-link .arrow { transform: translateX(4px); }

/* ---------- Publications ---------- */
.pub-list { margin-top: 32px; display: flex; flex-direction: column; gap: 16px; }
.pub-item {
  background: var(--panel); border: 1px solid var(--line); border-radius: 4px;
  padding: 20px; box-shadow: 0 1px 3px rgba(22,48,44,0.08);
  transition: box-shadow .25s;
}
.pub-item:hover { box-shadow: 0 6px 18px rgba(22,48,44,0.12); }
.pub-badges { display: flex; flex-wrap: wrap; gap: 12px; }
.badge { padding: 2px 8px; border-radius: 4px; font-size: 12px; font-weight: 600; }
.badge-year { background: var(--primary-light); color: var(--primary-dark); }
.badge-topic { background: var(--surface); color: var(--sub); border: 1px solid var(--line); }
.badge-published { background: var(--primary); color: #fff; }
.badge-review { background: #f5e6b8; color: #6b4a12; border: 1px solid #e0c98a; }
.badge-prep { background: #e8eef4; color: #34506b; border: 1px solid #c3d0de; }
.pub-item h3 { margin-top: 10px; font-size: 16px; font-weight: 600; color: var(--ink); line-height: 1.5; }
.pub-item .authors { margin-top: 6px; font-size: 13px; color: var(--sub); }
.pub-doi { margin-top: 10px; font-size: 13px; }
.pub-doi a { color: var(--primary); font-weight: 600; }

/* ---------- Page header (subpages) ---------- */
.page-header { position: relative; background: var(--ink); color: #fff; padding: 56px 0; }
.page-header .container { position: relative; }
.page-header .eyebrow { font-size: 13px; font-weight: 600; letter-spacing: 0.25em; text-transform: uppercase; color: var(--accent); }
.page-header h1 { margin-top: 14px; font-size: 32px; font-weight: 700; line-height: 1.15; letter-spacing: -0.01em; }
.page-header .headline { margin-top: 14px; font-size: 16px; line-height: 1.6; color: rgba(255,255,255,0.8); max-width: 720px; }

/* ---------- Model detail ---------- */
.model-detail { padding: 48px 0 72px; }
.model-head { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-bottom: 24px; }
.model-head .version-pill { padding: 3px 10px; border-radius: 4px; font-size: 13px; font-weight: 600; background: var(--primary-light); color: var(--primary-dark); }

/* params grid */
.params-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 24px 0 8px; }
.param { background: var(--panel); border: 1px solid var(--line); border-radius: 4px; padding: 14px 16px; }
.param .k { font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--primary-dark); font-weight: 600; }
.param .v { margin-top: 4px; font-size: 14px; color: var(--ink); }

/* files table */
.files-table { border: 1px solid var(--line); border-radius: 4px; overflow: hidden; background: var(--panel); box-shadow: 0 1px 3px rgba(22,48,44,0.08); }
.files-head { display: none; }
@media (min-width: 768px) {
  .files-head { display: grid; grid-template-columns: 1fr 150px 140px 160px; gap: 16px; padding: 12px 20px; background: var(--primary-light); font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--primary-dark); font-weight: 600; }
}
.files-row { display: grid; gap: 10px; padding: 16px 20px; border-top: 1px solid var(--line); grid-template-columns: 1fr; }
.files-row:first-child { border-top: 0; }
@media (min-width: 768px) { .files-row { grid-template-columns: 1fr 150px 140px 160px; align-items: center; } }
.files-row:hover { background: var(--surface); }
.file-main { display: flex; align-items: flex-start; gap: 12px; }
.file-icon { margin-top: 2px; width: 32px; height: 32px; flex-shrink: 0; border-radius: 4px; background: var(--primary-light); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 12px; }
.file-name { font-size: 14px; font-weight: 600; color: var(--ink); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; }
.file-desc { margin-top: 4px; font-size: 13px; color: var(--sub); line-height: 1.45; }
.file-fmt { font-size: 13px; color: var(--body); }
.file-size { font-size: 13px; color: var(--sub); font-family: ui-monospace, Menlo, monospace; }
.file-action { text-align: left; }
@media (min-width: 768px) { .file-action { text-align: right; } }
.download-btn { display: inline-flex; align-items: center; gap: 8px; padding: 8px 16px; border-radius: 4px; background: var(--primary); color: #fff; font-size: 13px; font-weight: 600; transition: background .2s, transform .1s; }
.download-btn:hover { background: var(--primary-dark); }

/* citation */
.cite-box { margin-top: 24px; background: var(--surface); border: 1px solid var(--line); border-left: 3px solid var(--primary); border-radius: 4px; padding: 16px 20px; }
.cite-box .k { font-size: 12px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--primary-dark); font-weight: 600; }
.cite-box p { margin-top: 8px; font-size: 14px; line-height: 1.6; color: var(--body); }
.cite-box a { color: var(--primary); }

/* figures */
.figures { margin-top: 40px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.figure { background: var(--panel); border: 1px solid var(--line); border-radius: 4px; padding: 12px; box-shadow: 0 1px 3px rgba(22,48,44,0.08); }
.figure img { width: 100%; height: auto; border-radius: 4px; border: 1px solid rgba(216,226,224,0.6); }
.figure figcaption { margin-top: 12px; font-size: 13px; line-height: 1.6; color: var(--sub); }
.figure .fig-title { font-weight: 700; color: var(--ink); margin-bottom: 6px; font-size: 14px; }
.figure figcaption a { color: var(--primary); text-decoration: underline; }
.figure figcaption a:hover { color: var(--primary-dark); }
.figure.wide { grid-column: 1 / -1; }
@media (max-width: 767px) { .figures { grid-template-columns: 1fr; } }

/* ---------- Publications page ---------- */
.pubs-page { padding: 48px 0 72px; }

/* ---------- Contact page ---------- */
.contact-page { padding: 48px 0 72px; }
.contact-grid { display: grid; gap: 32px; grid-template-columns: 1fr; }
@media (min-width: 768px) { .contact-grid { grid-template-columns: 1fr 1fr; } }
.contact-card { background: var(--panel); border: 1px solid var(--line); border-radius: 4px; padding: 24px; box-shadow: 0 1px 3px rgba(22,48,44,0.08); }
.contact-card .icon { width: 48px; height: 48px; margin: 0 auto; border-radius: 8px; background: var(--primary-light); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 22px; }
.contact-card h2 { margin-top: 18px; font-size: 22px; font-weight: 700; color: var(--ink); text-align: center; }
.contact-card p { margin-top: 12px; font-size: 14px; line-height: 1.65; color: var(--sub); max-width: 420px; margin-left: auto; margin-right: auto; text-align: center; }
.contact-card a.email { color: var(--primary); font-weight: 600; }
.coop-list { margin-top: 16px; display: flex; flex-direction: column; gap: 10px; max-width: 680px; }
.coop-list li { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; font-weight: 600; color: var(--body); }
.coop-list .check { color: var(--primary); font-weight: 700; }

/* Contact page — sections & person cards (left-aligned, Publications style) */
.contact-section { margin-top: 40px; }
.contact-section-title { font-size: 24px; font-weight: 700; color: var(--ink); margin: 0 0 16px; }
.contact-person-grid { display: grid; gap: 16px; grid-template-columns: 1fr; }
@media (min-width: 640px) { .contact-person-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) { .contact-person-grid { grid-template-columns: repeat(3, 1fr); } }
.contact-person-card { background: var(--panel); border: 1px solid var(--line); border-radius: 4px; padding: 20px 24px; text-align: left; box-shadow: 0 1px 3px rgba(22,48,44,0.08); }
.contact-person-card .person-head { display: flex; align-items: center; gap: 12px; }
.contact-person-card .icon { width: 40px; height: 40px; flex-shrink: 0; border-radius: 8px; background: var(--primary-light); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 18px; }
.contact-person-card h3 { font-size: 17px; font-weight: 700; color: var(--ink); }
.contact-person-card p { margin-top: 8px; font-size: 14px; line-height: 1.65; color: var(--sub); }
.contact-person-card a.email { color: var(--primary); font-weight: 600; }
.contact-note { font-size: 12px; font-style: italic; }

/* ---------- Footer ---------- */
.site-footer { background: var(--ink); color: rgba(255,255,255,0.7); }
.footer-grid { display: grid; gap: 32px; padding: 56px 20px 40px; grid-template-columns: 1fr; }
@media (min-width: 768px) { .footer-grid { grid-template-columns: 2fr 1fr 1fr 1fr; } }
.footer-col h4 { color: #fff; font-size: 15px; font-weight: 600; margin-bottom: 14px; }
.footer-col.brand-col p { font-size: 14px; line-height: 1.6; margin-top: 12px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul a { font-size: 14px; color: rgba(255,255,255,0.7); transition: color .2s; }
.footer-col ul a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.12); padding: 22px 20px; font-size: 13px; color: rgba(255,255,255,0.5); }

@media (max-width: 768px) {
  .hero h1 { font-size: 28px; }
  .card-grid { grid-template-columns: 1fr; }
  .params-grid { grid-template-columns: 1fr; }
  .main-nav {
    position: fixed; top: 64px; left: 0; right: 0; flex-direction: column;
    background: #fff; border-bottom: 1px solid var(--line);
    padding: 12px 20px; align-items: flex-start;
    transform: translateY(-12px); opacity: 0; pointer-events: none;
    transition: opacity .2s, transform .2s;
  }
  body.nav-open .main-nav { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .main-nav a { width: 100%; }
  .nav-toggle { display: block; }
  .section { padding: 48px 0 56px; }
}