/* ===== 365平台主站 · 共享样式 /assets/site.css ===== */

*, *::before, *::after { box-sizing: border-box; }

:root {
  /* 色彩体系 */
  --c-indigo: #0F1B30;
  --c-indigo-deep: #0B1526;
  --c-panel: #1A2B4A;
  --c-panel-soft: #22375C;
  --c-stone: #3A4148;
  --c-cream: #F7F3EA;
  --c-moss: #3F6B52;
  --c-moss-light: #7CC79C;
  --c-teal: #19A87A;
  --c-amber: #E0A32E;
  --c-coral: #E2604A;
  --c-clay: #B46A4A;
  --c-clay-light: #DE9A77;
  --c-mist: #9FB0C8;

  /* 线条 */
  --line: rgba(58, 65, 72, 0.9);
  --line-soft: rgba(159, 176, 200, 0.18);

  /* 尺度 */
  --rail-w: 272px;
  --topbar-h: 64px;
  --max-w: 1440px;
  --gutter: clamp(20px, 4vw, 56px);
  --radius-s: 8px;
  --radius-m: 14px;
  --radius-l: 22px;

  /* 字体 */
  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (min-width: 1560px) {
  :root { --rail-w: 300px; }
}

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

body {
  margin: 0;
  min-height: 100vh;
  padding-left: var(--rail-w);
  background-color: var(--c-indigo);
  color: var(--c-cream);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  overflow-x: hidden;
}

main { display: block; }

img, svg { max-width: 100%; }
img { height: auto; }

h1, h2, h3, h4, h5 { margin: 0 0 .6em; line-height: 1.18; }
h1 { font-size: clamp(2.2rem, 5vw, 4rem); font-weight: 200; letter-spacing: -0.02em; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.6rem); font-weight: 200; letter-spacing: -0.015em; }
h3 { font-size: 1.1rem; font-weight: 600; letter-spacing: .01em; }
h4 { font-size: 1rem; font-weight: 600; }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

a { color: var(--c-amber); text-underline-offset: 3px; }
a:hover { color: #F0BA55; }

ul, ol { padding-left: 1.2em; }

button { font: inherit; }

::selection { background-color: rgba(25, 168, 122, .35); color: var(--c-cream); }

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

/* ---------- 跳至正文 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 10px 18px;
  border-radius: var(--radius-s);
  background-color: var(--c-amber);
  color: #241703;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .1em;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform .2s ease;
}
.skip-link:focus { transform: translateY(0); color: #241703; }

/* ---------- 框架式导航（左侧视觉边框） ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 80;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  gap: 26px;
  padding: 30px 22px 22px;
  background-color: var(--c-indigo);
  background-image: radial-gradient(circle at 1px 1px, rgba(159, 176, 200, .16) 1px, transparent 0);
  background-size: 20px 20px;
  border-right: 1px solid var(--line);
  overflow-x: visible;
  overflow-y: auto;
}

.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(115% 55% at 12% 0%, rgba(25, 168, 122, .20), transparent 62%),
    radial-gradient(95% 45% at 100% 100%, rgba(224, 163, 46, .12), transparent 70%);
}

.site-header::after {
  content: "";
  position: absolute;
  top: 0;
  right: -1px;
  width: 2px;
  height: 42%;
  pointer-events: none;
  background-image: linear-gradient(180deg, var(--c-teal), rgba(25, 168, 122, 0));
}

.site-header > * { position: relative; z-index: 1; }

.rail-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  display: block;
  color: var(--c-cream);
  text-decoration: none;
}
.brand:hover { color: var(--c-cream); }

.brand-mark {
  display: block;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: .06em;
  line-height: 1.2;
}
.brand-mark::after {
  content: "";
  display: block;
  width: 36px;
  height: 3px;
  margin-top: 10px;
  border-radius: 2px;
  background-image: linear-gradient(90deg, var(--c-teal), var(--c-amber));
}

.brand-tagline {
  display: block;
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.65;
  letter-spacing: .1em;
  color: var(--c-mist);
}

/* 移动端按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  background-color: rgba(26, 43, 74, .7);
  color: var(--c-cream);
  font-size: 12px;
  letter-spacing: .16em;
  cursor: pointer;
}
.nav-toggle-box {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
  flex: 0 0 auto;
}
.nav-toggle-box span {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px;
  background-color: var(--c-cream);
  transition: transform .25s ease, opacity .25s ease, top .25s ease;
}
.nav-toggle-box span:nth-child(1) { top: 0; }
.nav-toggle-box span:nth-child(2) { top: 5px; }
.nav-toggle-box span:nth-child(3) { top: 10px; }
[data-header][data-open] .nav-toggle-box span:nth-child(1) { top: 5px; transform: rotate(45deg); }
[data-header][data-open] .nav-toggle-box span:nth-child(2) { opacity: 0; }
[data-header][data-open] .nav-toggle-box span:nth-child(3) { top: 5px; transform: rotate(-45deg); }

/* 导航主体 */
.site-nav {
  display: flex;
  flex-direction: column;
  gap: 18px;
  flex: 1 1 auto;
  min-height: 0;
}

.nav-list {
  counter-reset: railidx;
  list-style: none;
  margin: 0;
  padding: 14px 0 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
  border-top: 1px solid var(--line);
}
.nav-list li { counter-increment: railidx; }

.nav-list a {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 10px 10px 10px 12px;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  color: var(--c-mist);
  font-size: 14px;
  letter-spacing: .09em;
  line-height: 1.5;
  text-decoration: none;
  transition: color .22s ease, background-color .22s ease, border-color .22s ease;
}
.nav-list a::before {
  content: counter(railidx, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .05em;
  color: rgba(159, 176, 200, .6);
  transition: color .22s ease;
}
.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--c-cream);
  background-color: rgba(26, 43, 74, .9);
  border-left-color: var(--c-teal);
}
.nav-list a:hover::before,
.nav-list a:focus-visible::before { color: var(--c-teal); }

.nav-list a[aria-current="page"] {
  color: var(--c-cream);
  font-weight: 600;
  background-color: var(--c-panel);
  border-left-color: var(--c-amber);
}
.nav-list a[aria-current="page"]::before { color: var(--c-amber); }

.rail-quick {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.rail-quick-label {
  margin: 0 0 2px;
  font-size: 11px;
  letter-spacing: .22em;
  color: rgba(159, 176, 200, .7);
}
.quick-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  background-color: rgba(26, 43, 74, .55);
  color: var(--c-cream);
  font-size: 13px;
  letter-spacing: .08em;
  text-decoration: none;
  transition: border-color .22s ease, background-color .22s ease;
}
.quick-link::after {
  content: "→";
  font-size: 13px;
  color: var(--c-teal);
  transition: transform .22s ease;
}
.quick-link:hover,
.quick-link:focus-visible {
  color: var(--c-cream);
  border-color: var(--c-teal);
  background-color: rgba(26, 43, 74, .95);
}
.quick-link:hover::after { transform: translateX(4px); }

.rail-foot {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.rail-meta {
  margin: 0;
  font-size: 11px;
  letter-spacing: .16em;
  color: rgba(159, 176, 200, .75);
}
.rail-progress {
  position: relative;
  height: 2px;
  border-radius: 2px;
  background-color: rgba(58, 65, 72, .9);
  overflow: hidden;
}
.rail-progress > span {
  display: block;
  width: 0;
  height: 100%;
  background-image: linear-gradient(90deg, var(--c-teal), var(--c-amber));
  transition: width .15s linear;
}

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

/* ---------- 内容容器 ---------- */
.content-shell {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: clamp(28px, 4vw, 60px) var(--gutter) clamp(48px, 7vw, 96px);
}

.section { padding-block: clamp(32px, 4.5vw, 68px); }
.section--divided { border-top: 1px solid var(--line); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 26px;
  margin-bottom: clamp(20px, 3vw, 36px);
}
.section-title {
  margin: 0;
  font-size: clamp(1.5rem, 3vw, 2.3rem);
  font-weight: 200;
  letter-spacing: -.01em;
}
.section-lede {
  margin: 0;
  max-width: 60ch;
  font-size: 15px;
  color: var(--c-mist);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--c-teal);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background-color: var(--c-teal);
  flex: 0 0 auto;
}

.display {
  margin: 0;
  font-size: clamp(3.5rem, 10vw, 9rem);
  font-weight: 200;
  line-height: .96;
  letter-spacing: -.03em;
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  margin: 0 0 clamp(18px, 3vw, 34px);
  font-size: 12px;
  letter-spacing: .14em;
}
.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  margin: 0;
  padding: 0;
}
.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 12px;
  color: rgba(159, 176, 200, .8);
}
.breadcrumb li + li::before {
  content: "/";
  color: var(--c-stone);
}
.breadcrumb a { color: var(--c-mist); text-decoration: none; }
.breadcrumb a:hover { color: var(--c-amber); }
.breadcrumb [aria-current="page"] { color: var(--c-cream); }

/* ---------- 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2vw, 28px);
}
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (max-width: 1180px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 900px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background-color: rgba(26, 43, 74, .62);
  transition: border-color .25s ease, background-color .25s ease;
}
.card:hover { border-color: rgba(25, 168, 122, .55); background-color: rgba(26, 43, 74, .92); }
.card-title {
  margin: 0 0 10px;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: .02em;
}
.card-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-mist);
}
.card-meta {
  margin: 14px 0 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: rgba(159, 176, 200, .8);
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-size: 11.5px;
  letter-spacing: .12em;
  line-height: 1.6;
}
.tag--teal { color: var(--c-teal); }
.tag--amber { color: var(--c-amber); }
.tag--coral { color: var(--c-coral); }
.tag--moss { color: var(--c-moss-light); }
.tag--clay { color: var(--c-clay-light); }
.tag--mist { color: var(--c-mist); }

/* ---------- 数据锚点 ---------- */
.data-figure {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.9rem, 4vw, 3rem);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--c-amber);
}
.data-figure--teal { color: var(--c-teal); }
.data-label {
  margin: 10px 0 0;
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--c-mist);
}

/* ---------- 正文排版 ---------- */
.prose { max-width: 72ch; }
.prose p { margin: 0 0 1.1em; color: rgba(247, 243, 234, .88); }
.prose h2 { margin-top: 1.6em; }
.prose h3 { margin-top: 1.5em; color: var(--c-cream); }
.prose ul, .prose ol { margin: 0 0 1.2em; color: rgba(247, 243, 234, .88); }
.prose li { margin-bottom: .5em; }
.prose strong { color: var(--c-cream); font-weight: 600; }
.prose a { color: var(--c-amber); }

/* ---------- 时间轴 ---------- */
.timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background-image: linear-gradient(180deg, var(--c-teal), rgba(25, 168, 122, .06));
}
.timeline-item {
  position: relative;
  padding: 0 0 28px 34px;
}
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  border: 2px solid var(--c-teal);
  border-radius: 50%;
  background-color: var(--c-indigo);
}
.timeline-item--amber::before { border-color: var(--c-amber); }
.timeline-item--coral::before { border-color: var(--c-coral); }
.timeline-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--c-amber);
}
.timeline-title {
  margin: 6px 0 8px;
  font-size: 1.05rem;
  font-weight: 600;
}
.timeline-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-mist);
}

/* ---------- 标签页 ---------- */
.tabs { display: block; }
.tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: clamp(20px, 3vw, 30px);
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}
.tab {
  appearance: none;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background-color: rgba(26, 43, 74, .55);
  color: var(--c-mist);
  font-size: 13.5px;
  letter-spacing: .1em;
  cursor: pointer;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}
.tab:hover { color: var(--c-cream); border-color: rgba(159, 176, 200, .5); }
.tab[aria-selected="true"] {
  color: #06231A;
  font-weight: 600;
  background-color: var(--c-teal);
  border-color: var(--c-teal);
}
.tabpanel { animation: panelIn .3s ease both; }
.tabpanel[hidden] { display: none; }
@keyframes panelIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---------- 图片容器（供页面阶段放置图片） ---------- */
.media-frame {
  position: relative;
  width: 100%;
  margin: 0;
  aspect-ratio: var(--media-ratio, 16 / 9);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background-color: var(--c-panel);
  background-image:
    linear-gradient(rgba(159, 176, 200, .09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(159, 176, 200, .09) 1px, transparent 1px);
  background-size: 32px 32px;
  overflow: hidden;
}
.media-frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { --media-ratio: 21 / 9; }
.media-frame--tall { --media-ratio: 3 / 4; }
.media-caption {
  margin: 10px 0 0;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: rgba(159, 176, 200, .8);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .1em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .22s ease, color .22s ease, border-color .22s ease, transform .22s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background-color: var(--c-teal); color: #06231A; }
.btn--primary:hover, .btn--primary:focus-visible { background-color: #21C08D; color: #06231A; }
.btn--amber { background-color: var(--c-amber); color: #241703; }
.btn--amber:hover, .btn--amber:focus-visible { background-color: #F0BA55; color: #241703; }
.btn--coral { background-color: var(--c-coral); color: #2B0C06; }
.btn--coral:hover, .btn--coral:focus-visible { background-color: #F07C67; color: #2B0C06; }
.btn--ghost {
  border-color: var(--line);
  background-color: transparent;
  color: var(--c-cream);
}
.btn--ghost:hover, .btn--ghost:focus-visible {
  border-color: var(--c-teal);
  color: var(--c-teal);
}

/* ---------- 通用工具 ---------- */
.stack > * + * { margin-top: var(--stack-gap, 16px); }
.divider {
  height: 1px;
  margin: 0;
  border: 0;
  background-color: var(--line);
}
.is-muted { color: var(--c-mist); }
.text-amber { color: var(--c-amber); }
.text-teal { color: var(--c-teal); }
.text-coral { color: var(--c-coral); }

/* ---------- 显现动画 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
}
.js [data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
  transition: opacity .7s cubic-bezier(.2, .7, .3, 1), transform .7s cubic-bezier(.2, .7, .3, 1);
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  padding: clamp(36px, 5vw, 64px) var(--gutter) 28px;
  border-top: 1px solid var(--line);
  background-color: var(--c-indigo-deep);
  background-image: linear-gradient(180deg, rgba(26, 43, 74, .55) 0%, rgba(11, 21, 38, 0) 46%);
}

.footer-inner {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(220px, 1.3fr) minmax(180px, 1fr) minmax(260px, 1.2fr);
  gap: clamp(24px, 3vw, 48px);
  padding-bottom: clamp(28px, 4vw, 44px);
  border-bottom: 1px solid var(--line);
}

.footer-brand { min-width: 0; }
.footer-mark {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--c-cream);
}
.footer-tagline {
  margin: 10px 0 0;
  font-size: 13px;
  letter-spacing: .08em;
  line-height: 1.7;
  color: var(--c-mist);
}
.footer-hours {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--c-teal);
}

.footer-label {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: .24em;
  color: rgba(159, 176, 200, .72);
}

.footer-links { min-width: 0; }
.footer-links ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.footer-links a {
  color: var(--c-cream);
  font-size: 14px;
  letter-spacing: .05em;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s ease, border-color .2s ease;
}
.footer-links a:hover,
.footer-links a:focus-visible {
  color: var(--c-amber);
  border-bottom-color: rgba(224, 163, 46, .6);
}

.footer-contact { min-width: 0; }
.contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.contact-list li { display: grid; gap: 3px; }
.contact-key {
  font-size: 11px;
  letter-spacing: .2em;
  color: rgba(159, 176, 200, .72);
}
.contact-val {
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-cream);
  word-break: break-word;
}

.footer-legal {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding-top: 22px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: rgba(159, 176, 200, .72);
}
.footer-legal p { margin: 0; }

/* ---------- 断点：平板与手机 ---------- */
@media (max-width: 1100px) {
  .footer-inner {
    grid-template-columns: minmax(200px, 1fr) minmax(180px, 1fr);
  }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  body {
    padding-left: 0;
    padding-top: var(--topbar-h);
  }

  .site-header {
    right: 0;
    bottom: auto;
    width: 100%;
    height: var(--topbar-h);
    flex-direction: row;
    align-items: center;
    gap: 0;
    padding: 0 16px;
    border-right: none;
    border-bottom: 1px solid var(--line);
    overflow: visible;
  }
  .site-header::after { display: none; }

  .rail-top { display: contents; }

  .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
  }
  .brand-mark { font-size: 1.05rem; letter-spacing: .08em; }
  .brand-mark::after { display: none; }
  .brand-tagline { display: none; }

  .nav-toggle { display: inline-flex; margin-left: auto; }

  .site-nav {
    position: fixed;
    top: var(--topbar-h);
    left: 0;
    right: 0;
    z-index: 79;
    display: flex;
    flex-direction: column;
    max-height: 0;
    padding: 0 16px;
    overflow: hidden;
    visibility: hidden;
    background-color: var(--c-indigo-deep);
    border-bottom: 1px solid var(--line);
    transition: max-height .34s ease, padding .34s ease, visibility .34s ease;
  }
  [data-header][data-open] .site-nav {
    max-height: calc(100vh - var(--topbar-h));
    padding: 14px 16px 26px;
    overflow-y: auto;
    visibility: visible;
  }

  .nav-list { border-top: none; padding-top: 0; }
  .nav-list a { font-size: 15px; padding: 13px 12px; }

  .rail-quick { margin-top: 18px; }

  .rail-foot { display: none; }

  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .footer-contact { grid-column: auto; }
}

@media (max-width: 560px) {
  .display { font-size: clamp(2.6rem, 13vw, 3.4rem); line-height: 1.05; }
  .section-head { gap: 10px; }
  .tablist { gap: 6px; }
  .tab { padding: 9px 14px; font-size: 13px; }
  .footer-legal { font-size: 11px; letter-spacing: .08em; }
}

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