/* =========================================================
   豪利777主站 · 共享站点样式  /assets/site.css
   深空蓝基底 · 赤金强调 · 框架式导航 · 编辑部非对称版式
   ========================================================= */

/* ---------- 1. reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, 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, input, label, summary, select, textarea { font: inherit; }
button { background: none; border: 0; color: inherit; cursor: pointer; }
main { display: block; }

/* ---------- 2. 变量 ---------- */
:root {
  --void: #03060F;
  --space: #071127;
  --slate: #0E1F45;
  --panel: #16295C;
  --hair: #2C4A8F;
  --mist: #C9D6F2;
  --chalk: #F2F6FF;
  --gold: #E4A93C;
  --gold-soft: #F7D98C;
  --violet: #7A5CF0;
  --jade: #37C7AE;
  --dim: #7E93C6;

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

  --bar-h: 68px;
  --rail-w: 88px;
  --gutter: clamp(18px, 4vw, 56px);
  --shell: 1320px;
  --ease: cubic-bezier(.2, .7, .3, 1);
  --t: 200ms;
}
@media (max-width: 1024px) { :root { --bar-h: 62px; --rail-w: 0px; } }
@media (max-width: 560px) { :root { --bar-h: 58px; } }

/* ---------- 3. 基础排版 ---------- */
html { scroll-behavior: smooth; }
body {
  min-height: 100vh;
  padding-top: var(--bar-h);
  padding-left: var(--rail-w);
  overflow-x: hidden;
  background-color: var(--void);
  background-image:
    radial-gradient(1100px 560px at 84% -8%, rgba(122, 92, 240, .16), transparent 62%),
    radial-gradient(900px 520px at 8% 4%, rgba(44, 74, 143, .30), transparent 66%),
    linear-gradient(rgba(44, 74, 143, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(44, 74, 143, .07) 1px, transparent 1px),
    linear-gradient(180deg, #071127 0%, #03060F 68%);
  background-size: auto, auto, 96px 96px, 96px 96px, auto;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  transition: padding-left var(--t) var(--ease);
}
#main-content { display: block; scroll-margin-top: calc(var(--bar-h) + 24px); }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--chalk);
  line-height: 1.18;
  letter-spacing: .01em;
  font-weight: 900;
}
h1 { font-size: clamp(40px, 6vw, 96px); line-height: 1.06; }
h2 { font-size: clamp(28px, 3.4vw, 48px); }
h3 { font-size: clamp(21px, 2vw, 26px); font-weight: 700; }
h4 { font-size: 19px; font-weight: 700; }
p { max-width: 72ch; }
strong { color: var(--chalk); font-weight: 700; }
::selection { background: var(--gold); color: #130C02; }

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 1px;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

/* ---------- 4. 通用布局 ---------- */
.wrap {
  width: min(100%, var(--shell));
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { position: relative; padding-block: clamp(48px, 7vw, 104px); }
.section-head { display: flex; flex-direction: column; gap: 12px; margin-bottom: clamp(24px, 3vw, 44px); }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .28em;
  color: var(--violet);
  text-transform: uppercase;
}
.section-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 3.4vw, 48px);
  color: var(--chalk);
}
.lede { max-width: 68ch; font-size: 17.5px; color: var(--mist); }
.rule { height: 1px; border: 0; margin: 0; background: var(--hair); }

.split {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: clamp(24px, 4vw, 64px);
  align-items: start;
}
.split-aside { position: sticky; top: calc(var(--bar-h) + 24px); }
.split-main { min-width: 0; }

/* ---------- 5. 头部框架 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  transform: translateY(-220%);
  padding: 10px 18px;
  background: var(--gold);
  color: #140D02;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: transform var(--t) var(--ease);
}
.skip-link:focus { transform: translateY(0); }

.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 120; }

.frame-bar {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 32px);
  height: var(--bar-h);
  padding: 0 clamp(16px, 2.6vw, 34px);
  background: linear-gradient(180deg, rgba(7, 17, 39, .97), rgba(3, 6, 15, .92));
  border-bottom: 1px solid var(--hair);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
}
.frame-bar::before {
  content: "";
  position: absolute;
  left: var(--rail-w);
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--hair);
  opacity: .65;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-width: 0;
  text-decoration: none;
}
.brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 2.1vw, 26px);
  letter-spacing: .06em;
  color: var(--chalk);
  line-height: 1;
  transition: color var(--t) var(--ease);
}
.brand:hover .brand-name { color: var(--gold-soft); }
.brand-sub {
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--dim);
  white-space: nowrap;
}
.frame-note {
  margin-left: auto;
  padding-left: clamp(12px, 2vw, 26px);
  border-left: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .14em;
  color: var(--dim);
  white-space: nowrap;
}
.frame-tools {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-left: clamp(12px, 2vw, 26px);
  border-left: 1px solid var(--hair);
}
.frame-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--violet), var(--gold) 72%, var(--gold-soft));
  transition: transform 120ms linear;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid var(--hair);
  background: transparent;
  color: var(--chalk);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .08em;
  text-decoration: none;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease),
              background-color var(--t) var(--ease), background-image var(--t) var(--ease);
}
.btn-gold {
  background-image: linear-gradient(135deg, var(--gold), #C88C22);
  border-color: var(--gold);
  color: #130C02;
}
.btn-gold:hover,
.btn-gold:focus-visible {
  background-image: linear-gradient(135deg, var(--gold-soft), var(--gold));
  border-color: var(--gold-soft);
  color: #130C02;
}
.btn-line { border-color: var(--gold); color: var(--gold); }
.btn-line:hover, .btn-line:focus-visible { background: rgba(228, 169, 60, .14); color: var(--gold-soft); }
.btn-ghost { color: var(--mist); border-color: var(--hair); }
.btn-ghost:hover, .btn-ghost:focus-visible { border-color: var(--gold); color: var(--chalk); }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--hair);
  color: var(--mist);
  font-size: 13px;
  letter-spacing: .16em;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}
.nav-toggle:hover, .nav-toggle:focus-visible { border-color: var(--gold); color: var(--gold-soft); }
.nav-toggle-bars { display: inline-flex; flex-direction: column; gap: 4px; width: 18px; }
.nav-toggle-bar {
  display: block;
  height: 1px;
  width: 100%;
  background: currentColor;
  transition: transform var(--t) var(--ease), opacity var(--t) var(--ease);
}
.site-header[data-open="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.site-header[data-open="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 左侧竖向导轨 */
.rail-nav {
  position: fixed;
  top: var(--bar-h);
  left: 0;
  bottom: 0;
  z-index: 110;
  display: flex;
  flex-direction: column;
  width: var(--rail-w);
  overflow-y: auto;
  background: linear-gradient(180deg, rgba(7, 17, 39, .92), rgba(3, 6, 15, .88));
  border-right: 1px solid var(--hair);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}
.rail-list { display: flex; flex-direction: column; align-items: center; padding: 16px 0; }
.rail-item { width: 100%; }
.rail-link {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 76px;
  padding: 10px 0;
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-size: 14px;
  letter-spacing: .22em;
  color: var(--dim);
  text-decoration: none;
  transition: color var(--t) var(--ease), background-color var(--t) var(--ease);
}
.rail-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: transparent;
  transition: background-color var(--t) var(--ease);
}
.rail-link::after {
  content: "";
  position: absolute;
  right: 10px;
  top: 50%;
  width: 10px;
  height: 1px;
  background: var(--hair);
  transform: translateY(-50%);
  transition: width var(--t) var(--ease), background-color var(--t) var(--ease);
}
.rail-link:hover, .rail-link:focus-visible {
  color: var(--chalk);
  background: rgba(22, 41, 92, .55);
}
.rail-link:hover::after, .rail-link:focus-visible::after { width: 22px; background: var(--gold-soft); }
.rail-link[aria-current="page"] {
  color: var(--gold);
  background: linear-gradient(90deg, rgba(228, 169, 60, .18), rgba(228, 169, 60, 0));
}
.rail-link[aria-current="page"]::before { background: var(--gold); }
.rail-link[aria-current="page"]::after { width: 26px; background: var(--gold); }

.rail-utility {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 18px 0 22px;
  border-top: 1px solid var(--hair);
}
.rail-util-link {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-size: 11.5px;
  letter-spacing: .2em;
  color: var(--dim);
  text-decoration: none;
  transition: color var(--t) var(--ease);
}
.rail-util-link:hover, .rail-util-link:focus-visible { color: var(--gold-soft); }

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 120px);
  padding-top: clamp(40px, 6vw, 80px);
  background: linear-gradient(180deg, #050A18 0%, var(--void) 62%);
  border-top: 1px solid var(--hair);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: clamp(140px, 24%, 340px);
  height: 2px;
  background: linear-gradient(90deg, var(--gold), transparent);
}
.footer-frame {
  width: min(100%, var(--shell));
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: grid;
  grid-template-columns: minmax(220px, 1.1fr) minmax(340px, 2fr) minmax(260px, 1.5fr);
  gap: clamp(24px, 3.4vw, 56px);
  align-items: start;
}
.footer-brand { min-width: 0; }
.footer-logo {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3vw, 34px);
  letter-spacing: .06em;
  color: var(--chalk);
  line-height: 1.1;
}
.footer-tagline { margin-top: 8px; font-size: 14px; color: var(--dim); max-width: 26ch; }
.footer-note {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--hair);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--gold);
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
}
.footer-col { min-width: 0; }
.footer-col-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--hair);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--mist);
}
.footer-col-title::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--violet);
  flex: none;
}
.footer-list { display: flex; flex-direction: column; }
.footer-link {
  position: relative;
  display: inline-block;
  padding: 6px 0;
  font-size: 15px;
  color: var(--dim);
  text-decoration: none;
  transition: color var(--t) var(--ease);
}
.footer-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 3px;
  width: 0;
  height: 1px;
  background: var(--gold);
  transition: width var(--t) var(--ease);
}
.footer-link:hover, .footer-link:focus-visible { color: var(--chalk); }
.footer-link:hover::after, .footer-link:focus-visible::after { width: 100%; }

.footer-contact { min-width: 0; }
.contact-line {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px dashed rgba(44, 74, 143, .55);
  font-size: 14.5px;
  line-height: 1.65;
}
.contact-key { font-size: 12.5px; letter-spacing: .12em; color: var(--dim); padding-top: 2px; }
.contact-val { color: var(--mist); word-break: break-word; }
.contact-val.mono { font-size: 14px; color: var(--chalk); }
.contact-note { margin-top: 14px; font-size: 13px; line-height: 1.75; color: var(--dim); max-width: 40ch; }

.footer-base {
  margin-top: clamp(32px, 4vw, 56px);
  padding: 18px var(--gutter) 22px;
  border-top: 1px solid var(--hair);
  background: rgba(3, 6, 15, .72);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 28px;
}
.footer-legal, .footer-service {
  font-size: 13px;
  color: var(--dim);
  max-width: none;
}
.footer-legal .mono { color: var(--mist); }

/* ---------- 7. 组件：面包屑 ---------- */
.crumbs { margin-top: clamp(18px, 2.4vw, 28px); }
.crumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--dim);
}
.crumbs-item { display: inline-flex; align-items: center; gap: 8px; }
.crumbs-link {
  color: var(--dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}
.crumbs-link:hover, .crumbs-link:focus-visible { color: var(--gold); border-color: var(--gold); }
.crumbs-sep { color: var(--hair); }
.crumbs-current { color: var(--mist); }

/* ---------- 8. 组件：卡片 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: var(--slate);
  border: 1px solid var(--hair);
  transition: border-color var(--t) var(--ease), background-color var(--t) var(--ease);
}
.card:hover, .card:focus-within { border-color: var(--gold); }
.card--panel { background: var(--panel); }
.card--glass {
  background: rgba(22, 41, 92, .42);
  border-color: rgba(44, 74, 143, .85);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}
.card-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}
.card-title { font-size: clamp(19px, 1.6vw, 23px); font-weight: 700; color: var(--chalk); line-height: 1.35; }
.card-meta { font-family: var(--font-mono); font-size: 12px; letter-spacing: .12em; color: var(--dim); }

/* ---------- 9. 组件：标签 / 数字 / 图片 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid var(--hair);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--dim);
  white-space: nowrap;
}
.tag--gold { color: var(--gold); border-color: rgba(228, 169, 60, .55); }
.tag--violet { color: #A796FF; border-color: rgba(122, 92, 240, .6); }
.tag--jade { color: var(--jade); border-color: rgba(55, 199, 174, .55); }

.stat { display: flex; flex-direction: column; gap: 6px; }
.stat-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(34px, 4.6vw, 58px);
  line-height: 1;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}
.stat-unit { font-family: var(--font-mono); font-size: 14px; color: var(--dim); margin-left: 6px; }
.stat-label { font-size: 13.5px; letter-spacing: .08em; color: var(--dim); }

.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: linear-gradient(140deg, var(--slate), var(--void));
  border: 1px solid var(--hair);
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(3, 6, 15, 0) 45%, rgba(3, 6, 15, .72));
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--portrait { aspect-ratio: 3 / 4; }
.media-frame--placeholder {
  background-image:
    radial-gradient(circle at 50% 50%, rgba(228, 169, 60, .14), transparent 62%),
    linear-gradient(rgba(44, 74, 143, .35) 1px, transparent 1px),
    linear-gradient(90deg, rgba(44, 74, 143, .35) 1px, transparent 1px),
    linear-gradient(140deg, var(--slate), var(--void));
  background-size: auto, 40px 40px, 40px 40px, auto;
}
.media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--dim);
}

/* ---------- 10. 组件：折叠 / 档位切换 ---------- */
.fold {
  background: var(--slate);
  border: 1px solid var(--hair);
  transition: border-color var(--t) var(--ease);
}
.fold + .fold { border-top: 0; }
.fold[open] { border-color: rgba(228, 169, 60, .5); }
.fold-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px clamp(16px, 2vw, 22px);
  cursor: pointer;
  list-style: none;
  color: var(--chalk);
  font-size: 17px;
  font-weight: 700;
}
.fold-summary::-webkit-details-marker { display: none; }
.fold-summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--gold);
  transition: transform var(--t) var(--ease);
}
.fold[open] .fold-summary::after { content: "\2013"; }
.fold-body {
  padding: 16px clamp(16px, 2vw, 22px) 22px;
  border-top: 1px solid rgba(44, 74, 143, .5);
  font-size: 16.5px;
  color: var(--mist);
}

.segmented {
  --seg-cols: 3;
  position: relative;
  display: grid;
  grid-template-columns: repeat(var(--seg-cols), minmax(0, 1fr));
}
.segmented-item { display: contents; }
.segmented-input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  pointer-events: none;
}
.segmented-tab {
  grid-row: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 18px;
  border: 1px solid var(--hair);
  background: var(--slate);
  color: var(--dim);
  font-size: 15px;
  letter-spacing: .06em;
  cursor: pointer;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease), background-color var(--t) var(--ease);
}
.segmented-tab:hover { color: var(--chalk); border-color: var(--gold-soft); }
.segmented-input:checked + .segmented-tab {
  border-color: var(--gold);
  color: var(--gold-soft);
  background: linear-gradient(135deg, rgba(228, 169, 60, .18), rgba(228, 169, 60, .04));
}
.segmented-input:focus-visible + .segmented-tab { outline: 2px solid var(--gold); outline-offset: 2px; }
.segmented-panel {
  display: none;
  grid-row: 2;
  grid-column: 1 / -1;
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--hair);
  border-top: 0;
  background: var(--slate);
  color: var(--mist);
}
.segmented-input:checked ~ .segmented-panel { display: block; }

/* ---------- 11. 显现动效 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}
.js [data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 12. 响应式 ---------- */
@media (max-width: 1180px) {
  .footer-frame { grid-template-columns: minmax(0, 1fr) minmax(0, 1.7fr); }
  .footer-contact { grid-column: 1 / -1; }
}
@media (max-width: 1024px) {
  body { padding-left: 0; }
  .frame-bar::before { display: none; }
  .nav-toggle { display: inline-flex; }
  .rail-nav {
    top: var(--bar-h);
    left: 0;
    right: 0;
    bottom: auto;
    width: 100%;
    max-height: calc(100vh - var(--bar-h));
    border-right: 0;
    border-bottom: 1px solid var(--hair);
    background: rgba(3, 6, 15, .98);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-12px);
    transition: opacity var(--t) var(--ease), transform var(--t) var(--ease), visibility var(--t) linear;
  }
  .site-header[data-open="true"] .rail-nav {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
  }
  .rail-list { padding: 8px 0; }
  .rail-link {
    writing-mode: horizontal-tb;
    text-orientation: mixed;
    justify-content: flex-start;
    min-height: 0;
    padding: 15px clamp(20px, 6vw, 34px);
    font-size: 17px;
    letter-spacing: .1em;
    border-bottom: 1px solid rgba(44, 74, 143, .4);
  }
  .rail-link::after { display: none; }
  .rail-link[aria-current="page"] { background: linear-gradient(90deg, rgba(228, 169, 60, .2), rgba(228, 169, 60, 0)); }
  .rail-utility {
    margin-top: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 0 14px;
  }
  .rail-util-link {
    writing-mode: horizontal-tb;
    padding: 13px clamp(20px, 6vw, 34px);
    font-size: 14px;
    letter-spacing: .12em;
    color: var(--dim);
    border-bottom: 1px solid rgba(44, 74, 143, .3);
  }
}
@media (max-width: 1000px) {
  .frame-note { display: none; }
}
@media (max-width: 900px) {
  .split { grid-template-columns: minmax(0, 1fr); }
  .split-aside { position: static; }
}
@media (max-width: 720px) {
  body { font-size: 16.5px; }
  .brand-sub { display: none; }
  .frame-tools { gap: 8px; padding-left: 10px; }
  .btn { padding: 9px 13px; font-size: 13px; letter-spacing: .06em; }
  .footer-frame { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .segmented { --seg-cols: 1; }
  .segmented-tab { grid-column: 1 / -1; }
}
@media (max-width: 460px) {
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
  .contact-line { grid-template-columns: minmax(0, 1fr); gap: 2px; }
}

/* ---------- 13. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
  .frame-progress { transition: none; }
}