:root {
  color-scheme: light;
  --paper: #f4efe4;
  --ink: #171411;
  --muted: #675f55;
  --line: #2b261f;
  --teal: #107978;
  --coral: #c9533c;
  --blue: #365f91;
  --saffron: #dca632;
  --card: #fffaf0;
  --soft: #e7decf;
  --shadow: 10px 12px 0 rgba(23, 20, 17, .16);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--paper); color: var(--ink); letter-spacing: 0; }
a { color: inherit; }
img { max-width: 100%; display: block; }
.site-header {
  position: sticky; top: 0; z-index: 20;
  display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 28px;
  padding: 14px clamp(18px, 4vw, 56px);
  background: rgba(244, 239, 228, .95); border-bottom: 3px solid var(--ink);
  backdrop-filter: blur(10px);
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-weight: 800; white-space: nowrap; }
.brand-mark { width: 28px; height: 28px; border: 2px solid var(--ink); border-radius: 6px; position: relative; background: #fff; }
.brand-mark::before, .brand-mark::after { content: ""; position: absolute; background: var(--teal); border-radius: 999px; }
.brand-mark::before { width: 12px; height: 12px; left: 5px; top: 5px; }
.brand-mark::after { width: 7px; height: 7px; right: 4px; bottom: 4px; background: var(--coral); }
.site-header nav { display: flex; justify-content: flex-end; align-items: center; gap: 18px; flex-wrap: wrap; }
.site-header nav a { text-decoration: none; color: var(--muted); font-size: 14px; font-weight: 700; }
.site-header nav a:hover { color: var(--teal); }
.menu-button { display: none; border: 2px solid var(--line); background: var(--card); border-radius: 0; padding: 9px 12px; font-weight: 800; }
main { overflow: hidden; }
.catalog-hero {
  max-width: 1280px; margin: 0 auto; padding: clamp(22px, 4vw, 54px) clamp(14px, 3vw, 30px) 18px;
  display: grid; grid-template-columns: minmax(0, 1.22fr) minmax(340px, .78fr); align-items: stretch;
}
.catalog-photo { margin: 0; border: 4px solid var(--ink); background: #111; box-shadow: var(--shadow); min-height: 420px; }
.catalog-photo img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 16 / 9; }
.catalog-copy {
  align-self: center; margin-left: -42px; padding: clamp(24px, 4vw, 46px);
  background: #171411; color: #fff; border: 4px solid var(--ink); box-shadow: var(--shadow);
}
.catalog-copy h1 { font-size: clamp(38px, 6vw, 76px); line-height: 1; margin: 8px 0 18px; }
.catalog-copy .lead { color: #efe6d5; }
.drawer-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 26px; }
.drawer-actions .outline { color: #fff; border-color: #fff; }
.catalog-rails {
  max-width: 1180px; margin: 24px auto 48px; padding: 0 clamp(14px, 3vw, 30px);
  display: grid; gap: 0;
}
.catalog-lane a {
  display: grid; grid-template-columns: 180px 1fr 70px; gap: 16px; align-items: center;
  padding: 17px 18px; background: var(--card); border: 2px solid var(--ink); border-bottom-width: 0;
  text-decoration: none;
}
.catalog-lane:last-child a { border-bottom-width: 2px; }
.catalog-lane span { font-size: 20px; font-weight: 950; color: var(--ink); }
.catalog-lane p { margin: 0; color: var(--muted); line-height: 1.65; }
.catalog-lane b { color: var(--teal); justify-self: end; }
.drawer-board {
  max-width: 1180px; margin: 52px auto; padding: 0 clamp(14px, 3vw, 30px);
  display: grid; grid-template-columns: 300px 1fr; gap: 16px; align-items: start;
}
.drawer-label {
  background: #23201c; color: #fff; border: 3px solid var(--ink); padding: 22px; position: sticky; top: 88px;
}
.drawer-label p { color: #eadfcb; line-height: 1.8; }
.ticket-stack {
  margin: 56px 0; padding: 36px clamp(14px, 3vw, 30px);
  background: #211e1a; color: #fff; border-top: 4px solid var(--ink); border-bottom: 4px solid var(--ink);
}
.ticket-stack .stack-title, .system-tabs .stack-title { max-width: 1180px; margin: 0 auto 18px; }
.ticket-stack h2, .system-tabs h2 { margin: 0; font-size: clamp(28px, 4vw, 50px); }
.ticket-list { max-width: 1180px; margin: 0 auto; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.ticket-list .node-row { background: #fffaf0; color: var(--ink); border: 0; border-left: 10px solid var(--saffron); box-shadow: 6px 7px 0 rgba(0,0,0,.28); border-radius: 0; }
.ticket-list .node-row:nth-child(2) { border-left-color: var(--teal); }
.ticket-list .node-row:nth-child(3) { border-left-color: var(--coral); }
.ticket-list .node-row:nth-child(4) { border-left-color: var(--blue); }
.system-tabs, .reading-drawer, .faq-docket {
  max-width: 1180px; margin: 56px auto; padding: 0 clamp(14px, 3vw, 30px);
}
.system-tabs .platform-strip { grid-template-columns: repeat(4, 1fr); gap: 0; border: 2px solid var(--ink); }
.system-tabs .platform-strip article {
  border: 0; border-right: 2px solid var(--ink); border-radius: 0; background: var(--card);
}
.system-tabs .platform-strip article:last-child { border-right: 0; }
.reading-drawer .article-ledger { display: grid; grid-template-columns: 1fr; gap: 8px; }
.reading-drawer .article-card a {
  display: grid; grid-template-columns: 130px 1fr 1.2fr auto; gap: 14px; align-items: center;
  border: 2px solid var(--ink); border-radius: 0; box-shadow: none; background: #fffaf0;
}
.reading-drawer .article-card p { margin: 0; }
.faq-docket { display: grid; grid-template-columns: 300px 1fr; gap: 24px; }
.faq-docket details { border: 2px solid var(--ink); border-radius: 0; background: var(--card); }
.masthead {
  max-width: 1220px; margin: 0 auto; padding: clamp(34px, 6vw, 78px) clamp(18px, 4vw, 36px) 34px;
  display: grid; grid-template-columns: .78fr 1.22fr; gap: clamp(22px, 4vw, 56px); align-items: center;
}
.mast-copy h1, .article-head h1, .inner-hero h1 {
  font-size: clamp(36px, 6.4vw, 82px); line-height: .98; margin: 8px 0 18px; max-width: 900px;
}
.inner-hero h1:empty { display: none; }
.lead { font-size: clamp(17px, 2vw, 22px); line-height: 1.75; color: #34414b; margin: 0; }
.edition, .section-kicker { color: var(--teal); font-weight: 900; letter-spacing: 0; margin: 0 0 8px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.solid, .outline {
  display: inline-flex; align-items: center; justify-content: center; min-height: 44px;
  border-radius: 0; padding: 12px 18px; text-decoration: none; font-weight: 900;
}
.solid { background: var(--ink); color: #fff; border: 1px solid var(--ink); }
.outline { background: transparent; color: var(--ink); border: 1px solid var(--ink); }
.small { min-height: 38px; padding: 9px 14px; }
.hero-figure { margin: 0; background: #fff; border: 1px solid var(--line); box-shadow: var(--shadow); transform: rotate(.5deg); }
.hero-figure img { aspect-ratio: 16 / 9; object-fit: cover; }
.hero-figure figcaption { padding: 10px 14px; color: var(--muted); font-size: 13px; border-top: 1px solid var(--line); }
.front-grid, .device-shelf, .help-ledger, .contact-board {
  max-width: 1160px; margin: 34px auto; padding: 0 clamp(18px, 4vw, 36px);
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px;
}
.front-tile a, .device-shelf article, .help-ledger article, .contact-board article, .paper-panel, .article-card a {
  display: block; height: 100%; padding: 18px; background: #fffdf8; border: 1px solid var(--line); border-radius: 8px; text-decoration: none;
}
.front-tile span, .article-card strong, .node-row strong { display: block; font-size: 18px; font-weight: 900; }
.front-tile p, .device-shelf p, .help-ledger p, .contact-board p, .paper-panel p, .article-card p, .node-row p { color: var(--muted); line-height: 1.75; margin: 8px 0 0; }
.ledger-split, .node-sheet, .device-band, .article-section, .faq-strip, .pricing-board, .node-ledger, .first-use-list, .support-note, .timeline, .plain-prose {
  max-width: 1160px; margin: 44px auto; padding: 0 clamp(18px, 4vw, 36px);
}
.ledger-split { display: grid; grid-template-columns: .65fr 1.35fr; gap: 24px; align-items: start; }
.ledger-split h2, .node-sheet h2, .device-band h2, .article-section h2, .faq-strip h2, .paper-panel h2, .first-use-list h2, .support-note h2 { margin: 0 0 10px; font-size: clamp(24px, 3vw, 38px); line-height: 1.18; }
.ledger-split p, .device-band > p, .support-note p, .plain-prose p { color: var(--muted); line-height: 1.85; }
.ledger-table { background: #fff; border: 1px solid var(--ink); border-radius: 8px; overflow: hidden; }
.ledger-head, .ledger-row { display: grid; grid-template-columns: .8fr 1.4fr 1.3fr .9fr; }
.ledger-head span { background: var(--ink); color: #fff; font-weight: 900; padding: 12px; }
.ledger-row span { padding: 14px 12px; border-top: 1px solid var(--line); color: #33404a; line-height: 1.55; }
.ledger-row span + span, .ledger-head span + span { border-left: 1px solid var(--line); }
.receipt-strip { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.receipt-strip span { border: 1px solid var(--line); background: #fff; padding: 7px 10px; border-radius: 6px; color: var(--muted); font-weight: 800; }
.node-sheet { background: #f4f0e8; border-top: 2px solid var(--ink); border-bottom: 2px solid var(--ink); padding-top: 30px; padding-bottom: 30px; }
.sheet-head, .section-title-row { display: flex; align-items: end; justify-content: space-between; gap: 18px; margin-bottom: 18px; }
.node-rows { display: grid; gap: 10px; }
.node-row { display: grid; grid-template-columns: 1.1fr 1.2fr auto; gap: 16px; align-items: center; padding: 16px; background: #fffdf8; border: 1px solid var(--line); border-radius: 8px; }
.node-row a, .text-link { color: var(--teal); font-weight: 900; text-decoration-thickness: 2px; text-underline-offset: 4px; }
.platform-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin: 20px 0; }
.platform-strip article { border-left: 4px solid var(--teal); background: #fff; padding: 16px; border-radius: 6px; }
.platform-strip strong { display: block; margin-bottom: 8px; }
.article-ledger { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.article-ledger.full { grid-template-columns: repeat(3, 1fr); }
.article-card time { color: var(--coral); font-weight: 900; font-size: 13px; }
.article-card span { display: inline-flex; margin-top: 12px; border: 1px solid var(--line); border-radius: 6px; padding: 5px 8px; color: var(--teal); font-weight: 800; font-size: 13px; }
.faq-strip { display: grid; grid-template-columns: .55fr 1.45fr; gap: 26px; }
.faq-list { display: grid; gap: 10px; }
details { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 14px 16px; }
summary { cursor: pointer; font-weight: 900; }
details p { color: var(--muted); line-height: 1.75; }
.inner-hero { max-width: 1160px; margin: 0 auto; padding: clamp(34px, 6vw, 74px) clamp(18px, 4vw, 36px) 18px; border-bottom: 1px solid var(--line); }
.chapter-layout, .article-layout { max-width: 1160px; margin: 34px auto; padding: 0 clamp(18px, 4vw, 36px); display: grid; grid-template-columns: 220px 1fr; gap: 30px; align-items: start; }
.side-index { position: sticky; top: 82px; display: grid; gap: 8px; }
.side-index a { text-decoration: none; border-left: 3px solid var(--line); padding: 8px 10px; color: var(--muted); font-weight: 800; }
.side-index a:hover { border-color: var(--teal); color: var(--ink); }
.chapter, .article-body section { background: #fffdf8; border: 1px solid var(--line); border-radius: 8px; padding: 22px; margin-bottom: 14px; scroll-margin-top: 96px; }
.chapter h2, .article-body h2 { margin-top: 0; font-size: clamp(22px, 2.4vw, 32px); }
.chapter p, .article-body p { color: #3f4b55; line-height: 1.9; }
.two-column { max-width: 1160px; margin: 34px auto; padding: 0 clamp(18px, 4vw, 36px); display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.device-shelf { grid-template-columns: repeat(4, 1fr); }
.device-shelf h2, .help-ledger h2, .contact-board h2 { margin: 0; }
.device-shelf ul { margin: 12px 0 0; padding-left: 18px; color: #3f4b55; line-height: 1.8; }
.first-use-list { background: #fff; border: 1px solid var(--ink); border-radius: 8px; padding-top: 24px; padding-bottom: 24px; }
.first-use-list ol { margin: 0; padding-left: 22px; display: grid; gap: 12px; line-height: 1.8; color: #3f4b55; }
.support-note { background: var(--soft); border: 1px solid #c9d9d4; border-radius: 8px; padding-top: 24px; padding-bottom: 24px; }
.help-ledger { grid-template-columns: repeat(5, 1fr); }
.faq-paper { max-width: 880px; margin: 34px auto; padding: 0 18px; }
.timeline { display: grid; gap: 10px; }
.timeline article { display: grid; grid-template-columns: 150px 1fr; gap: 16px; background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 16px; }
.timeline time { color: var(--coral); font-weight: 900; }
.timeline p { margin: 0; color: var(--muted); line-height: 1.7; }
.article-head { max-width: 1000px; margin: 0 auto; padding: clamp(34px, 6vw, 74px) clamp(18px, 4vw, 36px) 24px; }
.article-head time { display: inline-flex; margin-top: 16px; color: var(--coral); font-weight: 900; }
.related { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 22px; }
.related span { font-weight: 900; }
.related a { border: 1px solid var(--line); border-radius: 6px; padding: 8px 10px; text-decoration: none; color: var(--teal); font-weight: 800; }
.plain-prose { max-width: 880px; }
.contact-board { grid-template-columns: repeat(3, 1fr); }
.site-footer { margin-top: 60px; padding: 28px clamp(18px, 4vw, 56px); display: grid; grid-template-columns: 1fr auto; gap: 20px; align-items: center; background: #151a1f; color: #fff; }
.site-footer p { margin: 8px 0 0; color: #cbd3d7; line-height: 1.7; max-width: 720px; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 12px; justify-content: flex-end; }
.site-footer a { color: #fff; text-decoration: none; font-weight: 800; }
@media (max-width: 920px) {
  .site-header { grid-template-columns: 1fr auto; }
  .menu-button { display: inline-flex; }
  .site-header nav { grid-column: 1 / -1; display: none; justify-content: start; }
  .site-header nav.open { display: flex; }
  .catalog-hero, .drawer-board, .faq-docket, .masthead, .ledger-split, .faq-strip, .chapter-layout, .article-layout, .two-column, .site-footer { grid-template-columns: 1fr; }
  .catalog-copy { margin-left: 0; margin-top: -24px; }
  .catalog-photo { min-height: 300px; }
  .drawer-label { position: static; }
  .catalog-lane a { grid-template-columns: 150px 1fr auto; }
  .ticket-list { grid-template-columns: 1fr; }
  .side-index { position: static; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .front-grid, .platform-strip, .article-ledger, .article-ledger.full, .device-shelf, .help-ledger, .contact-board { grid-template-columns: repeat(2, 1fr); }
  .system-tabs .platform-strip { grid-template-columns: repeat(2, 1fr); }
  .system-tabs .platform-strip article:nth-child(2) { border-right: 0; }
  .system-tabs .platform-strip article:nth-child(-n+2) { border-bottom: 2px solid var(--ink); }
  .reading-drawer .article-card a { grid-template-columns: 120px 1fr; }
  .reading-drawer .article-card p, .reading-drawer .article-card span { grid-column: 1 / -1; }
}
@media (max-width: 560px) {
  .site-header { padding: 12px 16px; gap: 10px; }
  .brand span:last-child { overflow: hidden; text-overflow: ellipsis; max-width: 230px; }
  .catalog-hero { padding: 14px 12px 10px; }
  .catalog-copy { padding: 20px; margin-top: -12px; }
  .catalog-copy h1 { font-size: 38px; line-height: 1.06; }
  .mast-copy h1, .article-head h1, .inner-hero h1 { font-size: 38px; line-height: 1.06; }
  .front-grid, .platform-strip, .article-ledger, .article-ledger.full, .device-shelf, .help-ledger, .contact-board, .side-index { grid-template-columns: 1fr; }
  .catalog-lane a { grid-template-columns: 1fr; gap: 8px; }
  .catalog-lane b { justify-self: start; }
  .system-tabs .platform-strip { grid-template-columns: 1fr; }
  .system-tabs .platform-strip article, .system-tabs .platform-strip article:nth-child(2) { border-right: 0; border-bottom: 2px solid var(--ink); }
  .system-tabs .platform-strip article:last-child { border-bottom: 0; }
  .reading-drawer .article-card a { grid-template-columns: 1fr; }
  .node-row { grid-template-columns: 1fr; }
  .ledger-table { overflow-x: auto; }
  .ledger-head, .ledger-row { min-width: 720px; }
  .timeline article { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
  .solid, .outline { width: 100%; }
  .site-footer nav { justify-content: start; }
}