/* FixWorthy — service-manual / schematic visual. Cool slate, steel blue, safety amber. */
:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --ink: #1a2330;
  --muted: #5b6673;
  --line: #d8dee6;
  --navy: #16233a;
  --steel: #1f4e79;
  --steel-soft: #e7eef5;
  --amber: #d97706;
  --amber-soft: #fdf0dc;
  --teal: #0f766e;
  --teal-soft: #e0f2f0;
  --red: #b91c1c;
  --red-soft: #fbe4e4;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
}
a { color: var(--steel); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* header */
.site-header { background: var(--panel); border-bottom: 3px solid var(--steel); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 68px; }
.brand { display: flex; align-items: center; gap: 12px; color: var(--navy); }
.brand-mark { width: 30px; height: 30px; color: var(--steel); }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-weight: 700; font-size: 1.2rem; letter-spacing: .02em; }
.brand-tag { font-family: var(--mono); font-size: .68rem; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; }
.main-nav { display: flex; gap: 22px; }
.main-nav a { color: var(--ink); font-weight: 600; font-size: .95rem; }
.main-nav a:hover { color: var(--steel); text-decoration: none; }

/* hero */
.hero { background: var(--navy); color: #eef2f7; padding: 64px 0 56px; border-bottom: 3px solid var(--amber); }
.hero-kicker { font-family: var(--mono); font-size: .72rem; letter-spacing: .16em; color: var(--amber); margin: 0 0 12px; text-transform: uppercase; }
.hero h1 { font-size: 2.4rem; line-height: 1.15; margin: 0 0 14px; max-width: 780px; }
.hero-lede { font-size: 1.1rem; color: #c3ccd8; max-width: 700px; margin: 0; }

/* section labels */
.section-label { font-family: var(--mono); font-size: .78rem; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); margin: 0 0 18px; }

/* zone nav */
.zone-nav { padding: 40px 0 8px; }
.zone-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 14px; }
.zone-card { background: var(--panel); border: 1px solid var(--line); border-top: 3px solid var(--steel); padding: 16px 18px; display: flex; flex-direction: column; gap: 6px; }
.zone-card:hover { border-color: var(--steel); text-decoration: none; }
.zone-count { font-family: var(--mono); font-size: .72rem; color: var(--amber); text-transform: uppercase; letter-spacing: .06em; }
.zone-name { font-weight: 700; color: var(--ink); font-size: 1.02rem; }

/* zone sections */
.zone-section { padding: 34px 0 6px; }
.zone-head { display: flex; align-items: baseline; justify-content: space-between; border-bottom: 2px solid var(--steel); padding-bottom: 8px; margin-bottom: 18px; }
.zone-head h2 { margin: 0; font-size: 1.35rem; }
.zone-more { font-size: .9rem; font-weight: 600; }

/* guide grid / cards */
.guide-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 16px; }
.guide-card { background: var(--panel); border: 1px solid var(--line); border-left: 4px solid var(--steel); padding: 18px 20px; display: flex; flex-direction: column; gap: 7px; color: var(--ink); }
.guide-card:hover { border-color: var(--steel); box-shadow: 0 2px 8px rgba(22, 35, 58, .08); text-decoration: none; }
.guide-difficulty { align-self: flex-start; font-family: var(--mono); font-size: .68rem; text-transform: uppercase; letter-spacing: .06em; padding: 2px 8px; border: 1px solid currentColor; }
.diff-beginner { color: var(--teal); }
.diff-intermediate { color: var(--amber); }
.diff-advanced { color: var(--red); }
.guide-title { font-weight: 700; font-size: 1.05rem; line-height: 1.3; }
.guide-zh { font-size: .86rem; color: var(--muted); }
.guide-desc { font-size: .88rem; color: var(--muted); }
.guide-safety { font-family: var(--mono); font-size: .7rem; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; margin-top: 2px; }

/* page head */
.page-head { padding: 40px 0 8px; }
.crumb { font-size: .85rem; color: var(--muted); margin: 0 0 10px; }
.crumb a { color: var(--steel); }
.page-head h1 { font-size: 2rem; line-height: 1.2; margin: 0 0 6px; max-width: 820px; }
.zh-sub { font-size: 1.02rem; color: var(--muted); margin: 0 0 8px; }
.lede { color: var(--muted); font-size: .95rem; margin: 0; }

/* layout: dossier aside + prose */
.layout { display: grid; grid-template-columns: 300px 1fr; gap: 36px; padding-top: 28px; padding-bottom: 56px; align-items: start; }
.dossier { background: var(--panel); border: 1px solid var(--line); border-top: 4px solid var(--amber); padding: 20px; position: sticky; top: 20px; }
.dossier-title { font-family: var(--mono); font-size: .76rem; text-transform: uppercase; letter-spacing: .1em; color: var(--amber); margin: 0 0 14px; }
.spec { margin: 0 0 16px; }
.spec-row { display: flex; justify-content: space-between; gap: 10px; padding: 8px 0; border-bottom: 1px dashed var(--line); font-size: .9rem; }
.spec-row:last-child { border-bottom: none; }
.spec-row dt { font-family: var(--mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.spec-row dd { margin: 0; font-weight: 600; text-align: right; }
.safety-meter { display: flex; align-items: center; justify-content: space-between; padding: 10px 12px; border-left: 4px solid; margin-bottom: 18px; }
.safety-low { background: var(--teal-soft); border-color: var(--teal); }
.safety-medium { background: var(--amber-soft); border-color: var(--amber); }
.safety-high { background: var(--red-soft); border-color: var(--red); }
.safety-label { font-family: var(--mono); font-size: .72rem; text-transform: uppercase; letter-spacing: .05em; }
.safety-low .safety-value { color: var(--teal); }
.safety-medium .safety-value { color: var(--amber); }
.safety-high .safety-value { color: var(--red); }
.safety-value { font-weight: 700; }
.cause-title { font-family: var(--mono); font-size: .76rem; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 0 0 10px; }
.cause-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.cause-list li { display: flex; align-items: baseline; gap: 10px; font-size: .9rem; }
.cause-num { font-family: var(--mono); font-size: .74rem; color: var(--amber); font-weight: 700; }

/* prose */
.prose { background: var(--panel); border: 1px solid var(--line); padding: 28px 34px; }
.prose h2 { font-size: 1.3rem; margin: 0 0 12px; color: var(--navy); }
.prose p { margin: 0 0 16px; }
.prose .sec { padding: 8px 0 18px; border-bottom: 1px solid var(--line); margin-bottom: 24px; }
.prose .sec:last-child { border-bottom: none; margin-bottom: 0; }
.sec-num { font-family: var(--mono); color: var(--amber); margin-right: 8px; font-size: 1rem; }
.related-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.related-list li::before { content: "\2192  "; color: var(--amber); }
.prose a { font-weight: 600; }

/* footer */
.site-footer { background: var(--navy); color: #c3ccd8; padding: 40px 0 28px; margin-top: 40px; }
.footer-inner { display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: start; }
.footer-brand .brand-name { color: #fff; font-size: 1.1rem; font-weight: 700; display: block; margin-bottom: 6px; }
.footer-brand p { margin: 0; font-size: .9rem; max-width: 420px; }
.footer-nav { display: flex; gap: 18px; }
.footer-nav a { color: #c3ccd8; font-size: .9rem; }
.footer-nav a:hover { color: #fff; }
.copyright { grid-column: 1 / -1; font-family: var(--mono); font-size: .72rem; color: #8491a3; margin: 0; border-top: 1px solid #2c3b52; padding-top: 16px; }

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .dossier { position: static; }
  .hero h1 { font-size: 1.7rem; }
  .footer-inner { grid-template-columns: 1fr; }
}