/* ==========================================================================
   north-ticket-beidan.com.cn — /assets/site.css
   共享外壳：reset / tokens / 中文排版 / 头部轨道导航 / 页脚 / 基础组件
   ========================================================================== */

/* 1. reset ---------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body, h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, picture, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
address { font-style: normal; }

/* 2. tokens --------------------------------------------------------------- */
:root {
  --deep: #0B2A4A;
  --night: #071B30;
  --ridge: #14487A;
  --gold: #D4A017;
  --gold-soft: #E8C46A;
  --sand: #F5EFE6;
  --linen: #FCFAF6;
  --ink: #0F1A24;
  --slate: #5C6E80;
  --red: #C0392B;
  --moss: #2E7D6B;
  --glass: rgba(252, 250, 246, .06);
  --line: rgba(11, 42, 74, .16);
  --line-strong: rgba(11, 42, 74, .30);
  --line-gold: rgba(212, 160, 23, .42);
  --on-dark: rgba(245, 239, 230, .78);
  --on-dark-soft: rgba(245, 239, 230, .54);

  --font-display: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --rail-w: 88px;
  --masthead-h: 64px;
  --shell-max: 1320px;
  --pad: 32px;
}

/* 3. 中文排版 -------------------------------------------------------------- */
body {
  background: var(--sand);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: .01em;
  padding: var(--masthead-h) 0 0 var(--rail-w);
  min-height: 100vh;
}
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 900; line-height: 1.14; letter-spacing: -.01em; color: var(--deep); }
h1 { font-size: clamp(2.6rem, 6vw, 5.2rem); }
h2 { font-size: clamp(1.7rem, 3.2vw, 2.6rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); font-weight: 700; }
h4 { font-size: 1.05rem; font-weight: 700; letter-spacing: .02em; }
.mono, .is-num { font-family: var(--font-mono); letter-spacing: -.01em; }

:focus-visible { outline: 2px solid var(--gold); outline-offset: 2px; border-radius: 2px; }

/* 4. skip link ------------------------------------------------------------ */
.skip-link {
  position: fixed; top: -70px; left: 12px; z-index: 200;
  padding: 10px 18px; border-radius: 0 0 8px 8px;
  background: var(--gold); color: var(--night); font-size: 14px; font-weight: 700;
  transition: top 160ms ease-out;
}
.skip-link:focus { top: 0; }

/* 5. header --------------------------------------------------------------- */
.site-header { position: relative; z-index: 70; }

.masthead {
  position: fixed; top: 0; left: var(--rail-w); right: 0;
  height: var(--masthead-h); z-index: 60;
  display: flex; align-items: center; gap: 18px;
  padding: 0 clamp(16px, 2.4vw, 32px);
  background: linear-gradient(90deg, rgba(7, 27, 48, .97), rgba(11, 42, 74, .94));
  border-bottom: 1px solid rgba(232, 196, 106, .24);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.masthead__meta {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .14em;
  color: var(--on-dark-soft); white-space: nowrap;
}
.masthead__actions { display: flex; align-items: center; gap: 10px; }

.brand { display: flex; align-items: center; gap: 12px; margin-right: auto; min-width: 0; color: var(--sand); }
.brand__mark {
  flex: none; width: 34px; height: 34px; display: grid; place-items: center;
  background: linear-gradient(140deg, var(--gold), var(--gold-soft));
  color: var(--night); font-family: var(--font-display); font-weight: 900; font-size: 17px;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 76% 100%, 0 100%);
}
.brand__text { display: flex; flex-direction: column; min-width: 0; }
.brand__name { font-family: var(--font-display); font-weight: 900; font-size: 17px; letter-spacing: .06em; color: var(--linen); }
.brand__sub { font-size: 11.5px; line-height: 1.5; letter-spacing: .06em; color: var(--on-dark-soft); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* 轨道导航 */
.rail {
  position: fixed; top: 0; left: 0; bottom: 0; width: var(--rail-w);
  z-index: 90;
  display: flex; flex-direction: column;
  background: linear-gradient(180deg, var(--night) 0%, var(--deep) 55%, var(--ridge) 100%);
  border-right: 1px solid rgba(232, 196, 106, .22);
  color: var(--sand);
}
.rail__mark { display: flex; flex-direction: column; align-items: center; gap: 10px; padding: 18px 0 12px; }
.rail__mark i { display: block; width: 2px; height: 26px; background: linear-gradient(180deg, var(--gold-soft), transparent); }
.rail__mark span { writing-mode: vertical-rl; font-size: 11px; letter-spacing: .3em; color: var(--gold-soft); }

.rail__list { flex: 1; display: flex; flex-direction: column; gap: 2px; padding: 4px 0 8px; overflow-y: auto; }
.rail__item { display: flex; }
.rail__link {
  flex: 1; display: flex; flex-direction: column; align-items: center; gap: 6px;
  padding: 9px 4px; border-left: 2px solid transparent;
  color: rgba(245, 239, 230, .62);
  transition: color 180ms ease-out, background-color 180ms ease-out, border-color 180ms ease-out;
}
.rail__num { font-family: var(--font-mono); font-size: 11px; letter-spacing: .04em; color: rgba(232, 196, 106, .58); }
.rail__label { writing-mode: vertical-rl; font-size: 12.5px; line-height: 1.05; letter-spacing: .16em; }
.rail__link:hover { color: var(--linen); background: var(--glass); border-left-color: rgba(232, 196, 106, .6); }
.rail__link:hover .rail__num { color: var(--gold-soft); }
.rail__link[aria-current="page"] { color: var(--linen); background: linear-gradient(180deg, rgba(212, 160, 23, .22), rgba(212, 160, 23, .06)); border-left-color: var(--gold); }
.rail__link[aria-current="page"] .rail__num { color: var(--gold); font-weight: 700; }

.rail__foot { display: flex; flex-direction: column; align-items: center; gap: 12px; padding: 12px 0 20px; border-top: 1px solid rgba(232, 196, 106, .16); }
.rail__sync { display: flex; flex-direction: column; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: 11px; letter-spacing: .08em; color: var(--on-dark-soft); }
.rail__dot { width: 6px; height: 6px; border-radius: 50%; background: var(--moss); box-shadow: 0 0 0 3px rgba(46, 125, 107, .28); }
.rail__progress { position: relative; width: 3px; height: 56px; border-radius: 2px; background: rgba(252, 250, 246, .14); overflow: hidden; }
.rail__progress-bar { display: block; width: 100%; height: 0; background: linear-gradient(180deg, var(--gold-soft), var(--gold)); transition: height 120ms linear; }
.rail__close { display: none; }

/* 抽屉按钮与遮罩 */
.nav-toggle {
  display: none; align-items: center; gap: 8px; height: 38px; padding: 0 12px;
  border: 1px solid rgba(232, 196, 106, .42); border-radius: 6px;
  color: var(--sand); font-size: 13px; font-weight: 700; letter-spacing: .08em;
  transition: background-color 180ms ease-out, border-color 180ms ease-out;
}
.nav-toggle:hover { background: rgba(252, 250, 246, .08); border-color: var(--gold); }
.nav-toggle__bars { position: relative; display: block; width: 16px; height: 2px; background: var(--gold-soft); }
.nav-toggle__bars::before, .nav-toggle__bars::after { content: ""; position: absolute; left: 0; width: 16px; height: 2px; background: var(--gold-soft); }
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }
.nav-scrim { display: none; }

/* 6. footer --------------------------------------------------------------- */
.site-footer {
  position: relative; overflow: hidden; color: var(--on-dark);
  background: linear-gradient(180deg, var(--night) 0%, var(--deep) 62%, var(--ridge) 100%);
}
.footer__contour {
  position: absolute; inset: 0; pointer-events: none; opacity: .85;
  background-image:
    repeating-radial-gradient(140% 100% at 6% 112%, rgba(232, 196, 106, .16) 0 1px, transparent 1px 48px),
    repeating-radial-gradient(110% 80% at 96% -12%, rgba(232, 196, 106, .10) 0 1px, transparent 1px 38px);
}
.footer__inner {
  position: relative; max-width: var(--shell-max); margin: 0 auto;
  padding: clamp(56px, 7vw, 96px) var(--pad) clamp(32px, 4vw, 56px);
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr);
  gap: clamp(32px, 5vw, 72px);
}
.footer__brand { font-family: var(--font-display); font-weight: 900; font-size: clamp(1.6rem, 3vw, 2.2rem); letter-spacing: .02em; color: var(--linen); line-height: 1.2; }
.footer__tagline { margin-top: 10px; font-family: var(--font-mono); font-size: 12.5px; letter-spacing: .12em; color: var(--gold-soft); }
.footer__sync { margin-top: 18px; padding-top: 18px; border-top: 1px solid rgba(232, 196, 106, .2); font-size: 14px; line-height: 1.85; color: var(--on-dark-soft); max-width: 44ch; }
.footer__contacts { display: flex; flex-direction: column; gap: 14px; margin-top: 26px; }
.footer__contact { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.footer__key { font-size: 11px; letter-spacing: .2em; color: var(--on-dark-soft); min-width: 60px; }
.footer__addr { font-size: 13.5px; line-height: 1.8; color: var(--on-dark-soft); }
.footer__note { font-size: 12.5px; line-height: 1.75; color: rgba(245, 239, 230, .45); max-width: 46ch; }

.copy-btn {
  display: inline-flex; align-items: center; gap: 10px; padding: 7px 12px;
  border: 1px solid rgba(232, 196, 106, .3); border-radius: 6px;
  background: rgba(252, 250, 246, .05); color: var(--sand);
  font-family: var(--font-mono); font-size: 13px; letter-spacing: .01em;
  transition: background-color 180ms ease-out, border-color 180ms ease-out;
}
.copy-btn:hover { background: rgba(212, 160, 23, .16); border-color: var(--gold); }
.copy-btn__hint { font-family: var(--font-body); font-size: 11px; letter-spacing: .1em; color: var(--gold-soft); border-left: 1px solid rgba(232, 196, 106, .3); padding-left: 10px; }
.copy-btn[data-copied="1"] { border-color: var(--gold); background: rgba(212, 160, 23, .2); }

.footer__nav { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: clamp(20px, 3vw, 36px); }
.footer__col-title { position: relative; margin-bottom: 14px; padding-bottom: 12px; font-size: 12px; font-weight: 700; letter-spacing: .24em; color: var(--gold-soft); }
.footer__col-title::after { content: ""; position: absolute; left: 0; bottom: 0; width: 26px; height: 2px; background: linear-gradient(90deg, var(--gold), var(--gold-soft)); }
.footer__list { display: flex; flex-direction: column; gap: 4px; }
.footer__link {
  display: inline-block; padding: 3px 0; font-size: 14px; line-height: 1.7; color: var(--on-dark);
  border-bottom: 1px solid transparent;
  transition: color 160ms ease-out, border-color 160ms ease-out;
}
.footer__link:hover { color: var(--linen); border-color: var(--line-gold); }

.footer__base {
  position: relative; max-width: var(--shell-max); margin: 0 auto;
  padding: 20px var(--pad) clamp(28px, 3vw, 44px);
  border-top: 1px solid rgba(232, 196, 106, .18);
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 28px;
  font-size: 12.5px; color: var(--on-dark-soft);
}
.footer__region { display: inline-flex; align-items: center; gap: 8px; color: var(--sand); letter-spacing: .08em; }
.footer__region::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--gold); box-shadow: 0 0 0 3px rgba(212, 160, 23, .22); }
.footer__icp { font-family: var(--font-mono); }
.footer__copyright { margin-left: auto; }

/* 7. 按钮 ----------------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px; border: 1px solid transparent; border-radius: 6px;
  font-family: var(--font-body); font-size: 13.5px; font-weight: 700; letter-spacing: .04em;
  transition: background-color 180ms ease-out, border-color 180ms ease-out, color 180ms ease-out, transform 180ms ease-out;
}
.btn:hover { transform: translateY(-2px); }
.btn--ghost { color: var(--sand); background: rgba(252, 250, 246, .04); border-color: rgba(232, 196, 106, .38); }
.btn--ghost:hover { background: rgba(252, 250, 246, .1); border-color: var(--gold-soft); }
.btn--gold { color: var(--night); background: linear-gradient(135deg, var(--gold), var(--gold-soft)); }
.btn--gold:hover { background: linear-gradient(135deg, var(--gold-soft), var(--gold)); }
.btn--line { color: var(--deep); background: transparent; border-color: var(--line-strong); }
.btn--line:hover { border-color: var(--gold); background: rgba(212, 160, 23, .1); }

/* 8. 容器与节奏 ----------------------------------------------------------- */
.page-shell { max-width: var(--shell-max); margin: 0 auto; padding: 0 var(--pad); }
.section { padding: clamp(72px, 9vw, 140px) 0; }
.section--tight { padding: clamp(46px, 6vw, 88px) 0; }
.section--sand { background: var(--sand); }
.section--linen { background: var(--linen); }
.section--night { background: linear-gradient(160deg, var(--night) 0%, var(--deep) 58%, var(--ridge) 100%); color: var(--on-dark); }
.section--night h1, .section--night h2, .section--night h3, .section--night h4 { color: var(--linen); }
.section--night .lede { color: var(--on-dark); }
.section__inner { max-width: var(--shell-max); margin: 0 auto; padding: 0 var(--pad); }
.page-head { padding: clamp(44px, 6vw, 88px) 0 clamp(24px, 3vw, 40px); border-bottom: 1px solid var(--line); }
.section--night .page-head { border-bottom-color: rgba(232, 196, 106, .2); }

.cut-band { width: 120px; height: 8px; margin: 18px 0 26px; background: linear-gradient(90deg, var(--gold), var(--gold-soft)); clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%); }
.contour-band {
  height: 56px;
  background-color: var(--sand);
  background-image: repeating-radial-gradient(120% 260% at 10% 120%, rgba(11, 42, 74, .1) 0 1px, transparent 1px 34px);
}
.contour-band--night {
  background-color: var(--night);
  background-image: repeating-radial-gradient(120% 260% at 10% 120%, rgba(232, 196, 106, .16) 0 1px, transparent 1px 34px);
}

/* 9. 网格与堆叠 ----------------------------------------------------------- */
.grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: clamp(20px, 2.4vw, 32px); }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }
.col-start-2 { grid-column-start: 2; }
.stack { display: flex; flex-direction: column; gap: clamp(16px, 2vw, 28px); }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }

/* 10. 文字组件 ------------------------------------------------------------ */
.eyebrow { display: flex; align-items: center; gap: 10px; margin-bottom: 14px; font-family: var(--font-mono); font-size: 12px; letter-spacing: .24em; color: var(--gold); }
.eyebrow::before { content: ""; display: block; width: 28px; height: 1px; background: var(--gold); }
.section-title { font-size: clamp(1.7rem, 3.2vw, 2.6rem); max-width: 22ch; }
.lede { font-size: clamp(1.05rem, 1.5vw, 1.22rem); line-height: 1.9; color: var(--slate); max-width: 62ch; }
.prose { max-width: 68ch; }
.prose p + p { margin-top: 1.1em; }
.note { max-width: 60ch; padding-left: 16px; border-left: 2px solid var(--line-gold); font-size: 13.5px; line-height: 1.75; color: var(--slate); }

/* 11. 内容块 -------------------------------------------------------------- */
.card {
  background: var(--linen); border: 1px solid var(--line); border-radius: 8px;
  padding: clamp(20px, 2.4vw, 30px);
  transition: border-color 180ms ease-out, transform 180ms ease-out, background-color 180ms ease-out;
}
.card:hover { border-color: var(--line-gold); transform: translateY(-2px); }
.card--glass { background: var(--glass); border-color: rgba(232, 196, 106, .24); color: var(--sand); -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); }
.card--glass:hover { background: rgba(252, 250, 246, .1); border-color: var(--gold); }
.card--ink { background: var(--deep); border-color: var(--ridge); color: var(--sand); }

.stat { display: flex; flex-direction: column; gap: 8px; }
.stat__num { display: block; font-family: var(--font-mono); font-weight: 700; font-size: clamp(3rem, 8vw, 6rem); line-height: 1; letter-spacing: -.04em; color: var(--deep); }
.stat__label { font-size: 13.5px; letter-spacing: .04em; color: var(--slate); }
.section--night .stat__num { color: var(--gold-soft); }
.section--night .stat__label { color: var(--on-dark); }

.tag { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: 999px; font-family: var(--font-mono); font-size: 12px; font-weight: 700; letter-spacing: .06em; }
.tag--gold { color: #7E5F0D; background: rgba(212, 160, 23, .14); border: 1px solid rgba(212, 160, 23, .36); }
.tag--alert { color: var(--red); background: rgba(192, 57, 43, .1); border: 1px solid rgba(192, 57, 43, .32); }
.tag--ok { color: var(--moss); background: rgba(46, 125, 107, .1); border: 1px solid rgba(46, 125, 107, .32); }
.section--night .tag--gold { color: var(--gold-soft); }

/* 12. 数据表与筛选 -------------------------------------------------------- */
.table-scroll { overflow-x: auto; border: 1px solid var(--line); border-radius: 8px; background: var(--linen); }
.data-table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.data-table caption { padding: 14px 16px 0; text-align: left; font-size: 13px; color: var(--slate); }
.data-table th, .data-table td { padding: 12px 16px; text-align: left; border-bottom: 1px solid rgba(11, 42, 74, .1); vertical-align: top; }
.data-table thead th { font-size: 12px; font-weight: 700; letter-spacing: .14em; color: var(--deep); background: rgba(11, 42, 74, .05); white-space: nowrap; }
.data-table td.is-num, .data-table th.is-num { font-family: var(--font-mono); text-align: right; letter-spacing: -.01em; white-space: nowrap; }
.data-table tbody tr:nth-child(even) { background: rgba(245, 239, 230, .72); }
.data-table tbody tr:hover { background: rgba(212, 160, 23, .1); }
.data-table tbody tr[hidden] { display: none; }

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 6px 14px; border: 1px solid var(--line-strong); border-radius: 999px;
  background: rgba(252, 250, 246, .7); color: var(--deep);
  font-size: 13px; font-weight: 700; letter-spacing: .04em;
  transition: background-color 180ms ease-out, border-color 180ms ease-out, color 180ms ease-out;
}
.chip:hover { border-color: var(--gold); background: rgba(212, 160, 23, .12); }
.chip[aria-pressed="true"] { background: var(--deep); border-color: var(--deep); color: var(--sand); }
.section--night .chip { background: rgba(252, 250, 246, .06); border-color: rgba(232, 196, 106, .3); color: var(--sand); }
.section--night .chip[aria-pressed="true"] { background: var(--gold); border-color: var(--gold); color: var(--night); }

/* 13. 横向滚动画轴 -------------------------------------------------------- */
.hscroll {
  display: flex; gap: clamp(16px, 2vw, 22px);
  overflow-x: auto; padding: 8px 4px 20px;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}
.hscroll > * { flex: 0 0 clamp(240px, 32%, 380px); scroll-snap-align: start; }
.hscroll:focus-visible { outline: 2px solid var(--gold); outline-offset: 4px; }
.hscroll__item { min-width: 0; }

/* 14. 图像容器基础规则 ---------------------------------------------------- */
.figure { margin: 0; }
.figure__frame {
  position: relative; overflow: hidden; aspect-ratio: 16 / 9;
  border: 1px solid var(--line); border-radius: 8px;
  background-color: var(--linen);
  background-image:
    repeating-radial-gradient(120% 200% at 12% 118%, rgba(11, 42, 74, .1) 0 1px, transparent 1px 26px),
    linear-gradient(150deg, rgba(11, 42, 74, .08), rgba(212, 160, 23, .12));
}
.figure__frame > img { width: 100%; height: 100%; object-fit: cover; }
.figure--tall .figure__frame { aspect-ratio: 4 / 5; }
.figure--wide .figure__frame { aspect-ratio: 21 / 9; }
.figure__cap { margin-top: 10px; font-size: 13px; line-height: 1.7; color: var(--slate); }
.section--night .figure__frame { border-color: rgba(232, 196, 106, .22); background-image: repeating-radial-gradient(120% 200% at 12% 118%, rgba(232, 196, 106, .14) 0 1px, transparent 1px 26px), linear-gradient(150deg, rgba(7, 27, 48, .6), rgba(20, 72, 122, .5)); }
.section--night .figure__cap { color: var(--on-dark-soft); }

/* 15. 面包屑 -------------------------------------------------------------- */
.breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding: 20px 0 0; font-size: 13px; color: var(--slate); }
.breadcrumb a { border-bottom: 1px solid transparent; transition: color 160ms ease-out, border-color 160ms ease-out; }
.breadcrumb a:hover { color: var(--deep); border-color: var(--line-gold); }
.breadcrumb__sep { color: rgba(92, 110, 128, .6); }
.breadcrumb [aria-current="page"] { color: var(--deep); font-weight: 700; }

/* 16. 显现动效 ------------------------------------------------------------ */
html[data-reveal-armed] [data-reveal] { opacity: 0; transform: translateY(8px); transition: opacity 280ms ease-out, transform 280ms ease-out; }
html[data-reveal-armed] [data-reveal][data-revealed] { opacity: 1; transform: none; }

/* 17. 响应式 -------------------------------------------------------------- */
@media (max-width: 1100px) {
  .masthead__meta { display: none; }
  .footer__inner { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 1000px) {
  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: span 6; }
  .col-start-2 { grid-column-start: 1; }
  .footer__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 32px; }
}
@media (max-width: 900px) {
  :root { --rail-w: 0px; --masthead-h: 58px; --pad: 20px; }
  body { padding-left: 0; font-size: 16.5px; }
  .masthead { left: 0; gap: 12px; }
  .nav-toggle { display: inline-flex; }

  .nav-scrim {
    display: block; position: fixed; inset: 0; z-index: 80;
    background: rgba(7, 27, 48, .62); opacity: 0; pointer-events: none;
    transition: opacity 200ms ease-out;
  }
  .site-header[data-open] .nav-scrim { opacity: 1; pointer-events: auto; }

  .rail {
    width: min(84vw, 320px);
    transform: translateX(-102%);
    transition: transform 220ms ease-out;
    overflow-y: auto;
  }
  .site-header[data-open] .rail { transform: translateX(0); }
  .rail__mark { display: none; }
  .rail__list { padding: 60px 0 16px; }
  .rail__link { flex-direction: row; justify-content: flex-start; gap: 14px; padding: 14px 22px; }
  .rail__label { writing-mode: horizontal-tb; font-size: 14.5px; letter-spacing: .06em; }
  .rail__num { font-size: 12px; }
  .rail__foot { display: none; }
  .rail__close {
    display: inline-flex; position: absolute; top: 12px; right: 12px;
    padding: 6px 12px; border: 1px solid rgba(232, 196, 106, .42); border-radius: 6px;
    color: var(--sand); font-size: 13px; letter-spacing: .08em;
  }
}
@media (max-width: 760px) {
  .btn--ghost { display: none; }
  .footer__copyright { margin-left: 0; }
}
@media (max-width: 640px) {
  .grid { grid-template-columns: 1fr; gap: 20px; }
  .col-4, .col-5, .col-6, .col-7, .col-8, .col-12 { grid-column: 1 / -1; }
  .section { padding: 56px 0; }
}
@media (max-width: 520px) {
  .masthead__actions { display: none; }
  .brand__sub { display: none; }
  .footer__nav { grid-template-columns: 1fr; }
  .copy-btn { font-size: 12px; }
}

/* 18. 动效降级 ------------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
  html[data-reveal-armed] [data-reveal] { opacity: 1 !important; transform: none !important; }
  .btn:hover, .card:hover { transform: none; }
}