/* =========================================================
   安博对局 · /assets/site.css
   未来感电竞控制台：深空紫黑基底 / 霓虹青交互 / 荧光品红数字
   ========================================================= */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 152px;
}
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dt, dd { margin: 0; padding: 0; }
ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

/* ---------- 2. 变量 ---------- */
:root {
  --bg: #0B0716;
  --rail: #140C2B;
  --panel: #1E1440;
  --violet: #7C4DFF;
  --cyan: #00E5FF;
  --magenta: #FF2E93;
  --mist: #A78BFA;
  --ink: #E8E4F5;
  --muted: #8A84A8;
  --green: #2BE0A8;
  --glass: rgba(255, 255, 255, 0.06);
  --glass-strong: rgba(255, 255, 255, 0.11);
  --line: rgba(167, 139, 250, 0.18);
  --line-strong: rgba(124, 77, 255, 0.42);

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

  --wrap: 1360px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --t: 200ms;
  --t-fast: 160ms;
  --t-slow: 240ms;
  --radius: 10px;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--bg);
  background-image:
    radial-gradient(900px 620px at 84% -12%, rgba(124, 77, 255, 0.22), transparent 72%),
    radial-gradient(720px 520px at -6% 28%, rgba(0, 229, 255, 0.09), transparent 70%),
    radial-gradient(600px 480px at 58% 108%, rgba(255, 46, 147, 0.08), transparent 72%);
  background-attachment: fixed;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
#main-content { display: block; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 300;
  line-height: 1.18;
  letter-spacing: 0.01em;
  color: var(--ink);
}
p { line-height: 1.75; }
strong { font-weight: 600; color: var(--ink); }

::selection { background: rgba(0, 229, 255, 0.28); color: #fff; }

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

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  left: 16px;
  top: -70px;
  z-index: 300;
  padding: 11px 18px;
  border-radius: 6px;
  background: var(--cyan);
  color: #05121A;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  transition: top var(--t-fast) var(--ease);
}
.skip-link:focus { top: 14px; }

/* ---------- 5. 容器 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: 28px;
}

/* ---------- 6. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(180deg, rgba(20, 12, 43, 0.97), rgba(11, 7, 22, 0.93));
  border-bottom: 1px solid var(--line-strong);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

/* 6.1 资费薄条 */
.fee-strip {
  background: rgba(11, 7, 22, 0.6);
  border-bottom: 1px solid var(--line);
}
.fee-strip__inner {
  display: flex;
  align-items: center;
  gap: 18px;
  padding-block: 9px;
}
.fee-strip__label {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  text-transform: uppercase;
}
.fee-strip__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  min-width: 0;
}
.fee-strip__item {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding-inline: 20px;
  border-left: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
  white-space: nowrap;
}
.fee-strip__item:first-child { border-left: 0; padding-left: 0; }
.fee-strip__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  color: var(--magenta);
}
.fee-strip__more {
  margin-left: auto;
  flex: 0 0 auto;
  padding: 5px 13px;
  border: 1px solid rgba(0, 229, 255, 0.35);
  border-radius: 999px;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  transition: background-color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.fee-strip__more:hover { background: rgba(0, 229, 255, 0.14); border-color: var(--cyan); }
.fee-strip__more[aria-expanded="true"] { background: rgba(0, 229, 255, 0.18); color: #EAFDFF; }

/* 6.2 资费面板 */
.fee-panel {
  border-top: 1px solid var(--line);
  background: rgba(18, 11, 38, 0.96);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
.fee-panel__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1px;
  background: var(--line);
  padding-inline: 0;
}
.fee-panel__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 20px;
  background: rgba(30, 20, 64, 0.95);
  font-size: 13px;
}
.fee-panel__name { color: var(--mist); letter-spacing: 0.04em; }
.fee-panel__price {
  font-family: var(--font-mono);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  color: var(--magenta);
  white-space: nowrap;
}
.fee-panel__note {
  grid-column: 1 / -1;
  padding: 13px 20px;
  background: rgba(11, 7, 22, 0.92);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}

/* 6.3 品牌与导航行 */
.header-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 26px;
  padding-block: 15px;
}

.brand { display: flex; align-items: center; gap: 14px; flex: 0 0 auto; }
.brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 9px;
  background: linear-gradient(140deg, #7C4DFF, #00E5FF);
  color: #0B0716;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  box-shadow: 0 0 0 1px rgba(0, 229, 255, 0.35), 0 14px 32px -16px rgba(124, 77, 255, 0.95);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.3; }
.brand__name { font-size: 17px; font-weight: 500; letter-spacing: 0.2em; color: var(--ink); }
.brand__line { font-size: 11px; letter-spacing: 0.06em; color: var(--muted); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  background: var(--glass);
  color: var(--ink);
  font-size: 12px;
  letter-spacing: 0.14em;
  transition: background-color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.nav-toggle:hover { background: var(--glass-strong); }
.nav-toggle[aria-expanded="true"] { border-color: var(--cyan); background: rgba(0, 229, 255, 0.12); }
.nav-toggle__bars { display: grid; gap: 4px; width: 18px; }
.nav-toggle__bars span { display: block; height: 1px; background: var(--cyan); }
.nav-toggle__label { white-space: nowrap; }

/* 6.4 主导航 */
.site-nav { display: flex; align-items: center; gap: 26px; min-width: 0; }
.site-nav__list {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px;
  counter-reset: navidx;
}
.site-nav__list li { counter-increment: navidx; display: flex; }
.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 11px;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--mist);
  transition: color var(--t-fast) var(--ease);
}
.site-nav__link::before {
  content: counter(navidx, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--muted);
  transition: color var(--t-fast) var(--ease);
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 3px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t) var(--ease);
}
.site-nav__link:hover, .site-nav__link:focus-visible { color: var(--ink); }
.site-nav__link:hover::after, .site-nav__link:focus-visible::after { transform: scaleX(1); }
.site-nav__link:hover::before, .site-nav__link:focus-visible::before { color: var(--cyan); }
.site-nav__link[aria-current="page"] { color: var(--cyan); }
.site-nav__link[aria-current="page"]::before { color: var(--cyan); }
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  padding-left: 24px;
  border-left: 1px solid var(--line);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: 7px;
  font-size: 13px;
  letter-spacing: 0.1em;
  white-space: nowrap;
  transition: transform var(--t) var(--ease), background-color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}
.btn--primary {
  background: var(--violet);
  color: #FFFFFF;
  box-shadow: inset 0 0 0 1px rgba(0, 229, 255, 0.32), 0 16px 34px -18px rgba(124, 77, 255, 0.95);
}
.btn--primary:hover { background: #8F66FF; transform: translateY(-2px); }
.btn--ghost {
  border-color: rgba(0, 229, 255, 0.4);
  background: rgba(0, 229, 255, 0.05);
  color: var(--cyan);
}
.btn--ghost:hover { background: rgba(0, 229, 255, 0.14); border-color: var(--cyan); transform: translateY(-2px); }

/* ---------- 8. 页脚 ---------- */
.site-footer {
  margin-top: 96px;
  border-top: 1px solid var(--line-strong);
  background: linear-gradient(180deg, rgba(20, 12, 43, 0.92), rgba(11, 7, 22, 1));
}

.fee-dock { background: var(--panel); border-bottom: 1px solid var(--line-strong); }
.fee-dock__inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px 26px;
  padding-block: 16px;
}
.fee-dock__tag {
  flex: 0 0 auto;
  padding: 4px 11px;
  border: 1px solid rgba(0, 229, 255, 0.35);
  border-radius: 999px;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
}
.fee-dock__items {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 30px;
  flex: 1 1 420px;
}
.fee-dock__item { display: flex; align-items: baseline; gap: 10px; }
.fee-dock__name { font-size: 12.5px; letter-spacing: 0.06em; color: var(--mist); }
.fee-dock__num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  color: var(--magenta);
}
.fee-dock__cta { flex: 0 0 auto; }

.footer-body {
  display: grid;
  grid-template-columns: 1.1fr 1.7fr 1.2fr;
  gap: 48px;
  padding-block: 56px 42px;
}

.footer-brand__name {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 22px;
  letter-spacing: 0.2em;
  color: var(--ink);
}
.footer-brand__note {
  margin: 12px 0 22px;
  max-width: 28ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.footer-nav { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; }
.footer-nav__group { min-width: 0; }
.footer-nav__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  text-transform: uppercase;
}
.footer-nav__list { display: grid; gap: 10px; }
.footer-nav__link {
  display: inline-block;
  padding-bottom: 2px;
  font-size: 14px;
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.footer-nav__link:hover, .footer-nav__link:focus-visible { color: var(--ink); border-bottom-color: var(--cyan); }

.footer-meta { display: grid; gap: 10px; align-content: start; font-size: 13px; color: var(--muted); }
.footer-meta__line { line-height: 1.7; }
.footer-meta__strong { color: var(--ink); font-family: var(--font-mono); font-size: 12.5px; }

.footer-legal { border-top: 1px solid var(--line); }
.footer-legal__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px 28px;
  padding-block: 20px 42px;
  font-size: 12px;
  color: var(--muted);
}
.footer-legal__copy { letter-spacing: 0.04em; }
.footer-legal__links { display: flex; flex-wrap: wrap; gap: 20px; }
.footer-legal__links a { transition: color var(--t-fast) var(--ease); }
.footer-legal__links a:hover, .footer-legal__links a:focus-visible { color: var(--cyan); }

/* ---------- 9. 通用内容组件 ---------- */
.section { padding-block: 72px; }
.section-head { display: grid; gap: 10px; max-width: 64ch; margin-bottom: 34px; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  text-transform: uppercase;
}
.section-index {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--violet);
}
.section-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.12;
  color: var(--ink);
}
.section-desc { max-width: 58ch; font-size: 15.5px; color: var(--mist); }

.prose { max-width: 72ch; color: var(--ink); }
.prose > * + * { margin-top: 1.1em; }
.prose h2 { font-size: clamp(22px, 2.6vw, 32px); color: var(--ink); }
.prose h3 { font-size: 19px; font-weight: 500; color: var(--ink); }
.prose ul, .prose ol { display: grid; gap: 0.6em; padding-left: 1.15em; }
.prose ul li { list-style: none; position: relative; }
.prose ul li::before { content: ""; position: absolute; left: -1.05em; top: 0.72em; width: 10px; height: 1px; background: var(--violet); }
.prose ol { list-style: decimal; }
.prose a {
  color: var(--cyan);
  border-bottom: 1px solid rgba(0, 229, 255, 0.4);
  transition: border-color var(--t-fast) var(--ease);
}
.prose a:hover { border-bottom-color: var(--cyan); }
.prose code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(124, 77, 255, 0.16);
  color: var(--ink);
}

.grid { display: grid; gap: 22px; }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.split-7-5 { display: grid; grid-template-columns: 7fr 5fr; gap: 34px; align-items: start; }
.split-5-7 { display: grid; grid-template-columns: 5fr 7fr; gap: 34px; align-items: start; }

.stack { display: grid; gap: 16px; }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.hairline { height: 1px; border: 0; background: var(--line); }
.surface-grid {
  background-image:
    linear-gradient(rgba(124, 77, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(124, 77, 255, 0.08) 1px, transparent 1px);
  background-size: 48px 48px;
}

/* 卡片 */
.card {
  position: relative;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  transition: transform var(--t) var(--ease), border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}
.card--glass {
  background: var(--glass);
  border-color: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.card--solid { background: var(--panel); border-color: var(--line-strong); }
.card:hover { transform: translateY(-2px); border-color: var(--line-strong); }
.card--glass:hover { background: var(--glass-strong); }
.card__head { display: flex; align-items: baseline; justify-content: space-between; gap: 14px; margin-bottom: 14px; }
.card__title { font-family: var(--font-display); font-size: 17px; font-weight: 500; letter-spacing: 0.04em; color: var(--ink); }
.card__body { font-size: 14.5px; line-height: 1.75; color: var(--mist); }
.card__note {
  margin-top: 16px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* 数字与标签 */
.num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  color: var(--magenta);
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
  white-space: nowrap;
}
.tag--fee { color: var(--magenta); border-color: rgba(255, 46, 147, 0.42); }
.tag--cyan { color: var(--cyan); border-color: rgba(0, 229, 255, 0.42); }
.tag--live { color: var(--green); border-color: rgba(43, 224, 168, 0.42); }
.tag--live::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--green); }

/* 数据表 */
.data-table { font-size: 14px; }
.data-table caption {
  padding-bottom: 12px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}
.data-table th, .data-table td { padding: 13px 16px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: middle; }
.data-table th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--mist);
  text-transform: uppercase;
}
.data-table td { color: var(--ink); }
.data-table tbody tr { transition: background-color var(--t-fast) var(--ease); }
.data-table tbody tr:hover { background: rgba(124, 77, 255, 0.1); }

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--muted);
}
.breadcrumb li { display: flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before { content: "/"; color: var(--violet); }
.breadcrumb a { color: var(--mist); transition: color var(--t-fast) var(--ease); }
.breadcrumb a:hover, .breadcrumb a:focus-visible { color: var(--cyan); }

/* 图片容器（页面阶段放入 img 即可） */
.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(150deg, #1E1440, #0B0716);
}
.media-frame img, .media-frame > svg { width: 100%; height: 100%; object-fit: cover; }
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, rgba(11, 7, 22, 0) 42%, rgba(11, 7, 22, 0.78));
  pointer-events: none;
}
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 16px 18px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* 章节索引链接 */
.index-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0 8px 13px;
  border-left: 2px solid transparent;
  font-size: 13.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}
.index-link:hover, .index-link:focus-visible { color: var(--ink); border-left-color: var(--violet); }
.index-link.is-active { color: var(--cyan); border-left-color: var(--cyan); }

/* 显现 */
[data-reveal] { opacity: 0; transform: translateY(14px); transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease); }
[data-reveal].is-visible { opacity: 1; transform: none; }

/* 滚动进度 */
.scroll-progress {
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  z-index: 150;
  height: 2px;
  background: rgba(124, 77, 255, 0.18);
  pointer-events: none;
}
.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--violet), var(--cyan), var(--magenta));
}

/* ---------- 10. 响应式 ---------- */
@media (max-width: 1200px) {
  .brand__line { display: none; }
  .site-nav { gap: 16px; }
  .site-nav__link { padding-inline: 8px; font-size: 13.5px; }
  .site-nav__link::after { left: 8px; right: 8px; }
  .nav-actions { padding-left: 16px; }
}

@media (max-width: 1040px) {
  .split-7-5, .split-5-7 { grid-template-columns: 1fr; gap: 26px; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-body { grid-template-columns: 1fr 1fr; gap: 38px; }
  .footer-nav { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 120px; }
  .nav-toggle { display: inline-flex; }

  .site-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 0 22px;
    max-height: calc(100vh - 96px);
    overflow-y: auto;
    background: rgba(11, 7, 22, 0.98);
    border-bottom: 1px solid var(--line-strong);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
  }
  .site-nav[data-open] { display: flex; }
  .site-nav > * { padding-inline: 18px; }

  .site-nav__list { flex-direction: column; align-items: stretch; gap: 0; width: 100%; }
  .site-nav__list li { width: 100%; }
  .site-nav__link {
    width: 100%;
    padding: 14px 0;
    font-size: 15px;
    border-bottom: 1px solid var(--line);
  }
  .site-nav__link::after { display: none; }
  .site-nav__link[aria-current="page"] { color: var(--cyan); }
  .site-nav__link:hover { color: var(--ink); }

  .nav-actions { flex-direction: column; align-items: stretch; gap: 10px; padding: 18px 18px 0; border-left: 0; }
  .nav-actions .btn { width: 100%; }
  .nav-actions .btn--ghost { display: inline-flex; }

  .section { padding-block: 52px; }
  .footer-body { grid-template-columns: 1fr; gap: 34px; padding-block: 42px 32px; }
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  .fee-strip__inner { flex-wrap: nowrap; gap: 12px; }
  .fee-strip__list {
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
  }
  .fee-strip__list::-webkit-scrollbar { display: none; }
  .fee-strip__item { padding-inline: 14px; }
  .fee-dock__items { flex: 1 1 100%; gap: 8px 22px; }
}

@media (max-width: 640px) {
  .wrap { padding-inline: 18px; }
  body { font-size: 15.5px; }
  .grid--2, .grid--3 { grid-template-columns: 1fr; }
  .card { padding: 20px; }
  .footer-nav { grid-template-columns: 1fr; gap: 22px; }
  .footer-legal__inner { flex-direction: column; align-items: flex-start; gap: 10px; padding-bottom: 32px; }
  .brand__mark { width: 38px; height: 38px; font-size: 13px; }
  .brand__name { font-size: 15.5px; letter-spacing: 0.16em; }
  .fee-panel__row { padding: 12px 18px; }
  .fee-panel__note { padding: 12px 18px; }
  .data-table th, .data-table td { padding: 11px 10px; font-size: 13px; }
}

/* ---------- 11. 可访问性 ---------- */
@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;
  }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
  .card:hover, .btn:hover { transform: none; }
}