/* ==========================================================================
   澳门沙金站 · 共享样式 /assets/site.css
   墨蓝暗场 + 沙金刻度 + 工程档案视觉系统
   ========================================================================== */

/* 1. Reset ---------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, figure, blockquote, dl, dd {
  margin: 0;
}

ul, ol { padding: 0; list-style: none; }

img, svg, video { display: block; max-width: 100%; }

a { color: inherit; }

button { font: inherit; color: inherit; background: none; border: 0; }

table { border-collapse: collapse; }

/* 2. 变量 ----------------------------------------------------------------- */
:root {
  --ink-900: #0A121C;
  --ink-800: #0E1B2A;
  --ink-700: #17293D;
  --paper-100: #F4F1EA;
  --paper-300: #D9D3C6;
  --gold-500: #C9A227;
  --gold-300: #E6CC72;
  --copper-600: #B85C2E;
  --steel-400: #8A8F98;
  --jade-500: #2E7D6B;
  --indigo-500: #3B5BA5;
  --plum-600: #7A4A72;
  --alarm-500: #D14B3C;

  --line-soft: rgba(217, 211, 198, 0.16);
  --line-strong: rgba(217, 211, 198, 0.32);
  --line-gold: rgba(201, 162, 39, 0.38);
  --line-copper: rgba(184, 92, 46, 0.55);
  --ink-on-paper: #0A121C;
  --muted-on-paper: #4B4F57;

  --font-display: "Archivo Narrow", "Arial Narrow", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "SFMono-Regular", "JetBrains Mono", "Roboto Mono", Menlo, Consolas, "Courier New", monospace;

  --header-h: 74px;
  --page-max: 1320px;
  --gutter: 24px;
  --ease: 0.24s cubic-bezier(0.2, 0.6, 0.3, 1);
  --radius: 0;
}

/* 3. 基础排版（中文正文行高 1.75） ---------------------------------------- */
body {
  background: var(--ink-900);
  color: var(--paper-100);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: 0.05em;
  color: var(--paper-100);
}

h1 { font-size: clamp(30px, 5vw, 54px); letter-spacing: 0.07em; }
h2 { font-size: clamp(24px, 3.4vw, 38px); }
h3 { font-size: clamp(19px, 2.2vw, 24px); }
h4 { font-size: 17px; letter-spacing: 0.1em; }

p { font-size: 17px; }

small { font-size: 13px; }

strong { font-weight: 700; }

.mono,
.model-code,
.contact-value.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.model-code {
  display: block;
  font-size: clamp(24px, 3vw, 34px);
  color: var(--gold-500);
  letter-spacing: 0.08em;
}

.lede {
  font-size: clamp(17px, 1.5vw, 20px);
  color: var(--paper-300);
  max-width: 38em;
}

.prose { max-width: 38em; }
.prose p + p { margin-top: 1.1em; }
.prose ul { list-style: disc; padding-left: 1.3em; }
.prose ul li + li { margin-top: 0.4em; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* 4. 焦点与可达性 --------------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--gold-300);
  outline-offset: 3px;
}

#main-content {
  display: block;
  scroll-margin-top: calc(var(--header-h) + 16px);
}

[id] { scroll-margin-top: calc(var(--header-h) + 20px); }

.skip-link {
  position: fixed;
  left: 16px;
  top: -80px;
  z-index: 120;
  padding: 10px 18px;
  background: var(--gold-500);
  color: var(--ink-900);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: top var(--ease);
}

.skip-link:focus {
  top: 12px;
}

/* 5. 阅读进度条 ----------------------------------------------------------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: rgba(217, 211, 198, 0.12);
  z-index: 90;
  pointer-events: none;
}

.scroll-progress-bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--gold-500), var(--gold-300));
  transition: width 0.12s linear;
}

/* 6. 头部：透明叠加 ⇄ 实色阅读态 ------------------------------------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, rgba(10, 18, 28, 0.78), rgba(10, 18, 28, 0));
  border-bottom: 1px solid transparent;
  transition: background var(--ease), border-color var(--ease);
}

.site-header[data-state="solid"] {
  background: rgba(14, 27, 42, 0.96);
  border-bottom-color: var(--line-gold);
  -webkit-backdrop-filter: blur(10px) saturate(1.15);
  backdrop-filter: blur(10px) saturate(1.15);
}

.header-shell {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 26px;
  transition: min-height var(--ease);
}

.site-header[data-state="solid"] .header-shell {
  min-height: 62px;
}

/* 品牌锁形 */
.site-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex: 0 0 auto;
}

.brand-mark {
  position: relative;
  display: block;
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  border: 1px solid var(--gold-500);
  background:
    repeating-linear-gradient(0deg, rgba(201, 162, 39, 0.28) 0 1px, transparent 1px 6px),
    linear-gradient(135deg, rgba(201, 162, 39, 0.22), rgba(201, 162, 39, 0) 62%);
}

.brand-mark::before {
  content: "";
  position: absolute;
  left: 7px; right: 7px;
  top: 50%;
  height: 1px;
  background: var(--gold-500);
  transform: rotate(-45deg);
}

.brand-mark::after {
  content: "";
  position: absolute;
  right: 4px; top: 4px;
  width: 3px; height: 3px;
  background: var(--gold-300);
}

.brand-mark-lg {
  width: 48px;
  height: 48px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--paper-100);
}

.brand-suffix {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  color: var(--gold-500);
}

.brand-tagline {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--steel-400);
  padding-left: 20px;
  border-left: 1px solid var(--line-soft);
  flex: 0 0 auto;
}

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-left: auto;
}

.nav-title { display: none; }

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 10px 12px;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--paper-300);
  text-decoration: none;
  transition: color var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; bottom: 4px;
  height: 1px;
  background: var(--gold-500);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--ease);
}

.nav-link:hover { color: var(--paper-100); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-link[aria-current="page"] { color: var(--gold-500); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }
.nav-link[aria-current="page"] .nav-index { color: var(--gold-500); }

.nav-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--steel-400);
  transition: color var(--ease);
}

.nav-label { display: inline-block; }

.nav-utility {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-left: 20px;
  border-left: 1px solid var(--line-soft);
}

.util-link {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--steel-400);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.util-link:hover {
  color: var(--gold-300);
  border-bottom-color: var(--gold-300);
}

/* 移动菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  margin-left: auto;
  border: 1px solid var(--line-strong);
  color: var(--paper-100);
  font-size: 13px;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: border-color var(--ease), color var(--ease);
}

.nav-toggle:hover { border-color: var(--gold-500); color: var(--gold-300); }

.nav-toggle-box {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
}

.nav-toggle-bar {
  position: absolute;
  left: 0; right: 0;
  height: 1px;
  background: currentColor;
  transition: transform var(--ease), opacity var(--ease);
}

.nav-toggle-bar:first-child { top: 0; }
.nav-toggle-bar:last-child { bottom: 0; }

.site-header[data-open] .nav-toggle-bar:first-child { transform: translateY(5.5px) rotate(45deg); }
.site-header[data-open] .nav-toggle-bar:last-child { transform: translateY(-5.5px) rotate(-45deg); }

/* 7. 按钮族 --------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color var(--ease), color var(--ease), border-color var(--ease);
}

.btn-gold {
  background: var(--gold-500);
  border-color: var(--gold-500);
  color: var(--ink-900);
}

.btn-gold:hover {
  background: var(--gold-300);
  border-color: var(--gold-300);
}

.btn-copper {
  background: var(--copper-600);
  border-color: var(--copper-600);
  color: var(--paper-100);
}

.btn-copper:hover {
  background: #cf6c39;
  border-color: #cf6c39;
}

.btn-ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--paper-100);
}

.btn-ghost:hover {
  border-color: var(--gold-500);
  color: var(--gold-300);
}

.btn-sm {
  padding: 9px 15px;
  font-size: 13px;
}

/* 8. 页脚 ----------------------------------------------------------------- */
.site-footer {
  position: relative;
  background: var(--ink-800);
  border-top: 1px solid var(--line-gold);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(217, 211, 198, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(217, 211, 198, 0.045) 1px, transparent 1px);
  background-size: 72px 72px;
}

.footer-shell {
  position: relative;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 56px var(--gutter) 32px;
}

.footer-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line-soft);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-brand-name {
  display: block;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--paper-100);
}

.footer-brand-suffix {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--gold-500);
}

.footer-tagline {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--steel-400);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 28px;
  padding: 32px 0 6px;
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold-500);
  margin-bottom: 14px;
}

.footer-links li + li { margin-top: 10px; }

.footer-link {
  font-size: 15px;
  color: var(--paper-300);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.footer-link:hover {
  color: var(--gold-300);
  border-bottom-color: var(--gold-300);
}

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 28px;
  padding-top: 26px;
  border-top: 1px solid var(--line-soft);
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--steel-400);
}

.contact-value {
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper-100);
  word-break: break-word;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
}

.legal-line {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel-400);
}

.footer-meta {
  font-size: 12px;
  color: var(--steel-400);
}

/* 9. 常驻报修条 ----------------------------------------------------------- */
.repair-bar {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 70;
  background: rgba(10, 18, 28, 0.95);
  border-top: 1px solid var(--line-copper);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.repair-shell {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
}

.repair-pulse {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  background: var(--copper-600);
  box-shadow: 0 0 0 4px rgba(184, 92, 46, 0.18);
}

.repair-text {
  display: flex;
  flex-direction: column;
  line-height: 1.35;
  min-width: 0;
}

.repair-text strong {
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--paper-100);
}

.repair-hint {
  font-size: 12px;
  color: var(--steel-400);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.repair-action { flex: 0 0 auto; margin-left: auto; }

/* 10. 容器、分区与栅格 ---------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.container-narrow {
  width: 100%;
  max-width: 820px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section { padding: 64px 0; }

.section-dark { background: var(--ink-900); }
.section-panel { background: var(--ink-800); }

.section-paper {
  background: var(--paper-100);
  color: var(--ink-on-paper);
}

.section-paper h1,
.section-paper h2,
.section-paper h3,
.section-paper h4 { color: var(--ink-on-paper); }

.section-paper .lead-text,
.section-paper .section-desc,
.section-paper .lede { color: var(--muted-on-paper); }

.section-paper .footer-link,
.section-paper a { color: var(--ink-on-paper); }

.grid {
  display: grid;
  gap: var(--gutter);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-6 { grid-column: span 6; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: 1 / -1; }

/* 11. 章节头与标签 -------------------------------------------------------- */
.section-head { margin-bottom: 32px; }

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold-500);
}

.eyebrow::before {
  content: "";
  width: 34px;
  height: 1px;
  background: var(--gold-500);
  flex: 0 0 auto;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.6vw, 42px);
  font-weight: 700;
  line-height: 1.16;
  letter-spacing: 0.05em;
  margin-bottom: 14px;
}

.section-desc {
  max-width: 62ch;
  color: var(--paper-300);
}

.section-paper .section-title { color: var(--ink-on-paper); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid currentColor;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tag-gold { color: var(--gold-500); }
.tag-copper { color: var(--copper-600); }
.tag-steel { color: var(--steel-400); }
.tag-jade { color: var(--jade-500); }
.tag-indigo { color: var(--indigo-500); }
.tag-plum { color: var(--plum-600); }

/* 12. Bento 卡片 ---------------------------------------------------------- */
.bento {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
  align-items: stretch;
}

.card {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  padding: 24px;
  transition: border-color var(--ease), background-color var(--ease);
}

.card:hover { border-color: var(--gold-500); }

.card-focus {
  background: linear-gradient(160deg, var(--ink-700), var(--ink-800) 72%);
  border-color: var(--line-gold);
}

.card-title {
  font-family: var(--font-display);
  font-size: clamp(19px, 2vw, 24px);
  letter-spacing: 0.05em;
  margin-bottom: 10px;
}

.card-desc {
  font-size: 15px;
  line-height: 1.7;
  color: var(--paper-300);
}

.section-paper .card {
  background: #FFFFFF;
  border-color: rgba(10, 18, 28, 0.14);
}

.section-paper .card-desc { color: var(--muted-on-paper); }

/* 13. 参数表 -------------------------------------------------------------- */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line-soft);
}

.data-table {
  width: 100%;
  min-width: 640px;
  font-size: 14px;
  font-family: var(--font-body);
}

.data-table th,
.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line-soft);
  text-align: left;
  white-space: nowrap;
}

.data-table th {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--steel-400);
  background: var(--ink-700);
}

.data-table tbody tr:nth-child(even) td {
  background: rgba(23, 41, 61, 0.45);
}

.data-table td.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

.section-paper .table-scroll { border-color: rgba(10, 18, 28, 0.16); }

.section-paper .data-table th {
  background: var(--paper-300);
  color: #4B4F57;
}

.section-paper .data-table th,
.section-paper .data-table td {
  border-bottom-color: rgba(10, 18, 28, 0.14);
  color: var(--ink-on-paper);
}

.section-paper .data-table tbody tr:nth-child(even) td {
  background: rgba(217, 211, 198, 0.35);
}

.scroll-hint {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--steel-400);
}

/* 14. 图片容器基础规则（页面阶段放图） ------------------------------------ */
.img-frame {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  background: var(--ink-700);
  border: 1px solid var(--line-soft);
}

.img-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s cubic-bezier(0.2, 0.6, 0.3, 1);
}

.img-frame:hover img { transform: scale(1.03); }

.img-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(244, 241, 234, 0.1) 1px, transparent 1px);
  background-size: 4px 4px;
  opacity: 0.55;
}

.img-frame-4x3 { aspect-ratio: 4 / 3; }
.img-frame-16x9 { aspect-ratio: 16 / 9; }
.img-frame-1x1 { aspect-ratio: 1 / 1; }
.img-frame-3x4 { aspect-ratio: 3 / 4; }

.figure { margin: 0; }

.figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--steel-400);
  letter-spacing: 0.04em;
}

.section-paper .figcaption { color: var(--muted-on-paper); }

/* 15. 装饰：细线、刻度、索引长栏 ------------------------------------------ */
.rule {
  height: 1px;
  border: 0;
  background: var(--line-soft);
  margin: 0;
}

.ticks {
  height: 14px;
  border-top: 1px solid var(--line-strong);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(217, 211, 198, 0.45) 0 1px,
    transparent 1px 24px
  );
}

.index-rail {
  position: sticky;
  top: calc(var(--header-h) + 24px);
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-left: 1px solid var(--line-soft);
}

.index-link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-left: -1px;
  padding: 10px 14px;
  font-size: 14px;
  color: var(--steel-400);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color var(--ease), border-color var(--ease), background-color var(--ease);
}

.index-link .index-code {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.index-link:hover {
  color: var(--paper-100);
  background: rgba(23, 41, 61, 0.6);
}

.index-link[data-active="true"] {
  color: var(--gold-500);
  border-left-color: var(--gold-500);
}

.section-paper .index-rail { border-left-color: rgba(10, 18, 28, 0.16); }

.section-paper .index-link { color: var(--muted-on-paper); }

.section-paper .index-link[data-active="true"] { color: var(--gold-500); }

/* 16. 面包屑 -------------------------------------------------------------- */
.breadcrumb {
  padding: 18px 0;
  font-size: 13px;
  color: var(--steel-400);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb-item { display: inline-flex; align-items: center; gap: 8px; }

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: rgba(217, 211, 198, 0.35);
}

.breadcrumb a {
  color: var(--paper-300);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.breadcrumb a:hover {
  color: var(--gold-300);
  border-bottom-color: var(--gold-300);
}

.breadcrumb-item[aria-current="page"] { color: var(--paper-100); }

/* 17. 入场显现 ------------------------------------------------------------ */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.32s ease, transform 0.32s ease;
}

.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* 18. 响应式：平板 -------------------------------------------------------- */
@media (max-width: 1100px) {
  .brand-tagline { display: none; }
}

@media (max-width: 1023px) {
  :root { --gutter: 18px; }

  body { padding-bottom: 74px; }

  .site-header[data-state="solid"] .header-shell { min-height: var(--header-h); }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    margin: 0;
    padding: 20px var(--gutter) 30px;
    background: var(--ink-900);
    border-top: 1px solid var(--line-gold);
    border-bottom: 1px solid var(--line-gold);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    transform: translateY(-10px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s ease;
  }

  .site-header[data-open] .site-nav {
    transform: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-title {
    display: block;
    margin-bottom: 12px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.24em;
    color: var(--steel-400);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-item { border-bottom: 1px solid rgba(217, 211, 198, 0.12); }

  .nav-link {
    width: 100%;
    padding: 16px 6px;
    font-size: 17px;
    gap: 16px;
    border-left: 2px solid transparent;
  }

  .nav-link::after { display: none; }

  .nav-link[aria-current="page"] {
    border-left-color: var(--gold-500);
    padding-left: 14px;
  }

  .nav-utility {
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    margin-top: 22px;
    padding: 22px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line-soft);
  }

  .util-link {
    padding: 6px 0;
    font-size: 15px;
  }

  .nav-utility .btn { width: 100%; }

  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-3 { grid-column: span 3; }
  .span-4 { grid-column: span 3; }
  .span-6 { grid-column: span 6; }
  .span-8 { grid-column: span 6; }

  .bento { grid-template-columns: repeat(6, minmax(0, 1fr)); }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .index-rail {
    position: static;
    border-left: 0;
    border-top: 1px solid var(--line-soft);
    padding-top: 8px;
  }

  .repair-shell { padding: 10px 18px; gap: 12px; }
}

/* 19. 响应式：手机 -------------------------------------------------------- */
@media (max-width: 599px) {
  body { font-size: 16px; padding-bottom: 76px; }

  .header-shell { gap: 12px; }
  .brand-name { font-size: 18px; }
  .brand-suffix { font-size: 9px; letter-spacing: 0.2em; }

  .grid-12,
  .bento { grid-template-columns: 1fr; gap: 16px; }

  .span-3,
  .span-4,
  .span-6,
  .span-8,
  .span-12 { grid-column: 1 / -1; }

  .section { padding: 48px 0; }

  .footer-grid { grid-template-columns: 1fr; gap: 22px; }
  .footer-shell { padding: 40px var(--gutter) 26px; }

  .repair-hint { display: none; }
  .repair-text strong { font-size: 13px; }
}

/* 20. 桌面：报修条停靠右下角 ---------------------------------------------- */
@media (min-width: 1024px) {
  .repair-bar {
    left: auto;
    right: 24px;
    bottom: 24px;
    max-width: 520px;
    border: 1px solid var(--line-copper);
    border-left: 2px solid var(--copper-600);
  }

  .repair-shell { padding: 12px 16px; }
  body { padding-bottom: 0; }
}

/* 21. 动效降级 ------------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .scroll-progress-bar { transition: none; }

  .img-frame:hover img { transform: none; }
}