/* ============================================================
   DBM Resources — shared stylesheet for /resources/ pages
   Brand-consistent with the homepage, but clean & responsive
   (the homepage CSS is desktop-locked at min-width:1200px and
   must NOT be reused on content pages — Google mobile-first).
   ============================================================ */

/* ─── Self-hosted variable fonts (same as homepage) ─── */
@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 100 800;
  font-display: swap;
  src: url("/assets/fonts/jetbrains-mono-var.woff2") format("woff2");
}
@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url("/assets/fonts/space-grotesk-var.woff2") format("woff2");
}

:root {
  --bg: #f6faf6;
  --bg-2: #eef3ee;
  --panel: #ffffff;
  --line: #d6e0d8;
  --line-2: #bccabf;
  --ink: #10231a;
  --ink-2: #4d6155;
  --ink-3: #8b9b90;
  --accent: #1f9d57;
  --accent-2: #0c8a48;
  --accent-soft: rgba(31, 157, 87, 0.12);
  --alert: #d23b3b;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  --sans: "Space Grotesk", system-ui, -apple-system, "Segoe UI", sans-serif;
  --cn: "Space Grotesk", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", system-ui, sans-serif;
  --maxw: 880px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
a { color: var(--accent-2); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }

/* Chinese pages use a CJK-capable font stack and normal letter-spacing */
html[lang="zh-CN"] body { font-family: var(--cn); letter-spacing: 0; }
html[lang="zh-CN"] .eyebrow, html[lang="zh-CN"] .breadcrumb { letter-spacing: 0.04em; }

/* ─── Header ─── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px;
  padding: 14px clamp(18px, 5vw, 48px);
  background: rgba(246, 250, 246, 0.92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .brand { display: flex; align-items: center; gap: 10px; }
.site-header .brand img { width: 28px; height: 28px; }
.site-header .brand b {
  font-family: var(--mono); font-weight: 700; letter-spacing: 0.12em;
  font-size: 15px; color: var(--ink);
}
.site-header nav { display: flex; align-items: center; gap: 22px; }
.site-header nav a { color: var(--ink-2); font-size: 14px; font-weight: 500; }
.site-header nav a:hover { color: var(--accent-2); text-decoration: none; }
.site-header .cta {
  background: var(--accent); color: #fff;
  padding: 9px 16px; border-radius: 7px;
  font-size: 14px; font-weight: 600; white-space: nowrap;
}
.site-header .cta:hover { background: var(--accent-2); text-decoration: none; }
.site-header .lang-link {
  color: var(--ink-2); font-size: 13px; font-family: var(--mono);
  border: 1px solid var(--line); padding: 7px 11px; border-radius: 6px; white-space: nowrap;
}
.site-header .lang-link:hover { color: var(--accent-2); border-color: var(--accent); text-decoration: none; }
@media (max-width: 680px) {
  .site-header nav .hide-sm { display: none; }
}

/* ─── Breadcrumb ─── */
.breadcrumb {
  max-width: var(--maxw); margin: 0 auto;
  padding: 18px clamp(18px, 5vw, 24px) 0;
  font-family: var(--mono); font-size: 12.5px; color: var(--ink-3);
  letter-spacing: 0.02em;
}
.breadcrumb a { color: var(--ink-3); }
.breadcrumb a:hover { color: var(--accent-2); }
.breadcrumb span { color: var(--ink-2); }

/* ─── Article ─── */
.article {
  max-width: var(--maxw); margin: 0 auto;
  padding: 8px clamp(18px, 5vw, 24px) 64px;
}
.eyebrow {
  font-family: var(--mono); font-size: 12.5px; font-weight: 600;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent-2); margin: 28px 0 10px;
}
.article h1 {
  font-size: clamp(28px, 5vw, 40px); line-height: 1.18;
  font-weight: 700; letter-spacing: -0.01em; margin: 0 0 20px;
}
.article h2 {
  font-size: clamp(22px, 3.4vw, 28px); line-height: 1.25;
  font-weight: 700; letter-spacing: -0.01em;
  margin: 52px 0 16px; padding-top: 14px;
  border-top: 1px solid var(--line);
}
.article h3 { font-size: 19px; font-weight: 700; margin: 28px 0 10px; }
.article p { margin: 0 0 18px; color: #1a2e24; }
.article ul, .article ol { margin: 0 0 18px; padding-left: 22px; }
.article li { margin: 0 0 8px; }
.article strong { color: var(--ink); }
.lede {
  font-size: clamp(18px, 2.4vw, 21px); line-height: 1.6;
  color: var(--ink-2); margin: 0 0 8px;
}

/* ─── Comparison table ─── */
.table-wrap { overflow-x: auto; margin: 0 0 22px; border: 1px solid var(--line); border-radius: 10px; }
table.cmp { width: 100%; border-collapse: collapse; font-size: 15px; min-width: 540px; }
table.cmp th, table.cmp td { padding: 11px 14px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
table.cmp thead th { background: var(--bg-2); font-weight: 700; color: var(--ink); position: sticky; top: 0; }
table.cmp tbody tr:last-child td { border-bottom: none; }
table.cmp td:first-child, table.cmp th:first-child {
  font-family: var(--mono); font-size: 13px; color: var(--ink-2);
  background: #fbfdfb; font-weight: 500; white-space: nowrap;
}
table.cmp .epp { color: var(--accent-2); font-weight: 600; }

/* ─── Callout / note ─── */
.note {
  display: flex; gap: 12px;
  background: var(--accent-soft); border-left: 3px solid var(--accent);
  padding: 14px 16px; border-radius: 8px; margin: 0 0 22px;
  font-size: 15px; color: var(--ink-2);
}
.note b { color: var(--ink); }

/* ─── Spec chips ─── */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 4px 0 22px; }
.chips span {
  font-family: var(--mono); font-size: 12.5px; color: var(--ink-2);
  background: var(--panel); border: 1px solid var(--line);
  padding: 6px 11px; border-radius: 999px;
}

/* ─── FAQ ─── */
.faq { margin: 8px 0 0; }
.faq details {
  border: 1px solid var(--line); border-radius: 9px;
  padding: 4px 16px; margin: 0 0 10px; background: var(--panel);
}
.faq summary {
  cursor: pointer; font-weight: 600; padding: 12px 0;
  list-style: none; display: flex; justify-content: space-between; align-items: center;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--accent); font-family: var(--mono); font-size: 20px; }
.faq details[open] summary::after { content: "−"; }
.faq details > p { margin: 0 0 14px; color: var(--ink-2); font-size: 15.5px; }

/* ─── CTA block ─── */
.cta-block {
  margin: 48px 0 0; padding: 30px clamp(20px, 4vw, 36px);
  background: var(--ink); color: #eafaf0; border-radius: 14px;
  text-align: center;
}
.cta-block h2 { border: none; margin: 0 0 8px; padding: 0; color: #fff; font-size: 22px; }
.cta-block p { color: #b9d4c5; margin: 0 0 18px; }
.cta-block a.btn {
  display: inline-block; background: var(--accent); color: #fff;
  padding: 12px 26px; border-radius: 8px; font-weight: 600;
}
.cta-block a.btn:hover { background: var(--accent-2); text-decoration: none; }

/* ─── Related links ─── */
.related { margin: 44px 0 0; padding-top: 18px; border-top: 1px solid var(--line); }
.related h2 { border: none; margin: 0 0 14px; padding: 0; font-size: 18px; }
.related ul { list-style: none; padding: 0; display: grid; gap: 8px; }
.related a { font-weight: 500; }
.related .soon { color: var(--ink-3); font-family: var(--mono); font-size: 12px; }

/* ─── Footer ─── */
.site-footer {
  border-top: 1px solid var(--line); background: var(--bg-2);
  padding: 36px clamp(18px, 5vw, 48px);
  font-size: 14px; color: var(--ink-2);
}
.site-footer .wrap { max-width: 1100px; margin: 0 auto; display: flex; flex-wrap: wrap; gap: 28px 56px; justify-content: space-between; }
.site-footer .col h5 { margin: 0 0 10px; font-size: 12px; font-family: var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); }
.site-footer .col ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 7px; }
.site-footer .col a { color: var(--ink-2); }
.site-footer .col a:hover { color: var(--accent-2); text-decoration: none; }
.site-footer .about { max-width: 320px; }
.site-footer .about b { font-family: var(--mono); letter-spacing: 0.12em; color: var(--ink); }
.site-footer .legal { max-width: 1100px; margin: 24px auto 0; padding-top: 16px; border-top: 1px solid var(--line); font-size: 12.5px; color: var(--ink-3); }

/* ─── Resources index (hub) ─── */
.hub { max-width: var(--maxw); margin: 0 auto; padding: 12px clamp(18px, 5vw, 24px) 64px; }
.hub h1 { font-size: clamp(28px, 5vw, 38px); margin: 18px 0 8px; }
.hub .sub { color: var(--ink-2); font-size: 18px; margin: 0 0 28px; }
.hub .cards { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.hub .card { display: block; border: 1px solid var(--line); border-radius: 12px; padding: 20px; background: var(--panel); transition: border-color .15s, transform .15s; }
.hub a.card:hover { border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }
.hub .card .k { font-family: var(--mono); font-size: 12px; color: var(--accent-2); letter-spacing: 0.08em; }
.hub .card h3 { margin: 8px 0 6px; font-size: 18px; color: var(--ink); }
.hub .card p { margin: 0; color: var(--ink-2); font-size: 14.5px; }
.hub .card.disabled { opacity: 0.6; }
.hub .card.disabled .k { color: var(--ink-3); }