/* =========================================================
   电玩平台棋牌 · 共享站点套件  /assets/site.css
   深夜棋牌电玩厅：深墨底 + 玻璃暗层 + 霓虹紫 / 电光青 / 琥珀金
   ========================================================= */

/* ---------- 1. 设计变量 ---------- */
:root {
  --ink: #0B0A14;
  --ink-deep: #07060E;
  --glass: #1A1730;
  --glass-soft: rgba(26, 23, 48, 0.66);
  --violet: #A78BFA;
  --violet-deep: #7C4DFF;
  --cyan: #22D3EE;
  --amber: #F5B942;
  --text: #F5F3FF;
  --muted: #A8A3C2;
  --ok: #34D399;
  --warn: #FB923C;

  --line: rgba(167, 139, 250, 0.18);
  --line-cyan: rgba(34, 211, 238, 0.24);
  --line-amber: rgba(245, 185, 66, 0.34);

  --radius: 18px;
  --radius-sm: 10px;
  --shadow-neon: 0 20px 50px -26px rgba(124, 77, 255, 0.75);
  --shadow-cyan: 0 18px 44px -28px rgba(34, 211, 238, 0.85);

  --font-title: "Alibaba PuHuiTi 3.0 115 Black", "Source Han Sans SC Heavy",
    "Noto Sans SC Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans SC", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono",
    monospace;

  --wrap: 1280px;
  --pad: clamp(16px, 4vw, 48px);
  --header-h: 76px;
  --scroll-progress: 0;
}

/* ---------- 2. reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

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

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

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

a { color: inherit; text-decoration: none; }

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

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 3. 中文排版与页面底色 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(90% 60% at 8% -6%, rgba(124, 77, 255, 0.30), transparent 62%),
    radial-gradient(70% 55% at 96% 6%, rgba(34, 211, 238, 0.16), transparent 60%),
    radial-gradient(80% 60% at 50% 108%, rgba(167, 139, 250, 0.14), transparent 66%);
  background-repeat: no-repeat;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  letter-spacing: 0.012em;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.035) 0 1px,
    transparent 1px 4px
  );
  opacity: 0.5;
}

h1, h2, h3, h4 {
  font-family: var(--font-title);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.015em;
}

p { max-width: 68ch; }

.display-title {
  font-size: clamp(2.4rem, 6vw, 5.6rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.6rem);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.lede {
  font-size: clamp(1rem, 1.4vw, 1.18rem);
  color: var(--muted);
  max-width: 58ch;
}

.prose p { margin-bottom: 1.1em; color: rgba(245, 243, 255, 0.9); }
.prose p:last-child { margin-bottom: 0; }
.prose strong { color: var(--text); font-weight: 800; }
.prose a { color: var(--cyan); text-decoration: underline; text-underline-offset: 3px; }

.num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--amber);
}

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

/* ---------- 4. 布局骨架 ---------- */
.container {
  width: min(calc(100% - var(--pad) * 2), var(--wrap));
  margin-inline: auto;
}

.container--narrow { --wrap: 860px; }

.section { padding-block: clamp(48px, 7vw, 104px); }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px 32px;
  margin-bottom: clamp(26px, 4vw, 48px);
}

.divider {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--violet-deep), var(--cyan), transparent 82%);
  opacity: 0.55;
}

.grid { display: grid; gap: clamp(16px, 2.2vw, 28px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.grid--asym {
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr) minmax(0, 0.85fr);
  align-items: start;
}

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  transition: transform 0.22s ease, box-shadow 0.22s ease, background 0.22s ease,
    border-color 0.22s ease, color 0.22s ease;
}

.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn--neon {
  background: linear-gradient(120deg, var(--violet-deep), var(--cyan));
  color: #08060F;
  box-shadow: var(--shadow-neon);
}

.btn--amber {
  background: linear-gradient(120deg, var(--amber), var(--warn));
  color: #1B1002;
  box-shadow: 0 16px 40px -24px rgba(245, 185, 66, 0.9);
}

.btn--ghost {
  background: rgba(26, 23, 48, 0.55);
  border-color: var(--line-cyan);
  color: var(--text);
}

.btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 0 0 0 1px rgba(34, 211, 238, 0.35) inset;
}

.btn--member {
  padding: 9px 18px;
  font-size: 14px;
  background: linear-gradient(120deg, var(--amber), var(--warn));
  color: #1B1002;
  box-shadow: 0 12px 30px -18px rgba(245, 185, 66, 0.95);
}

.btn--member:hover { box-shadow: 0 16px 34px -14px rgba(245, 185, 66, 0.95); }

/* ---------- 6. 状态点 / 标签 ---------- */
.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--muted);
  flex: none;
}

.status-dot--ok {
  background: var(--ok);
  box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.18);
}

.status-dot--live {
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(34, 211, 238, 0.20);
  animation: dot-breathe 2.8s ease-in-out infinite;
}

.status-dot--warn {
  background: var(--warn);
  box-shadow: 0 0 0 3px rgba(251, 146, 60, 0.18);
}

@keyframes dot-breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.45; }
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(11, 10, 20, 0.55);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  border: 1px solid var(--line);
  color: var(--muted);
  background: rgba(26, 23, 48, 0.6);
}

.badge--live {
  color: var(--cyan);
  border-color: var(--line-cyan);
  background: rgba(34, 211, 238, 0.10);
}

.badge--maint {
  color: var(--warn);
  border-color: rgba(251, 146, 60, 0.32);
  background: rgba(251, 146, 60, 0.10);
}

.badge--gray {
  color: var(--muted);
  border-color: rgba(168, 163, 194, 0.28);
  background: rgba(168, 163, 194, 0.08);
}

/* ---------- 7. 面板 ---------- */
.glass-panel {
  background: linear-gradient(158deg, rgba(26, 23, 48, 0.88), rgba(11, 10, 20, 0.72));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(18px, 2.6vw, 30px);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.solid-panel {
  background: var(--glass);
  border: 1px solid rgba(167, 139, 250, 0.22);
  border-radius: var(--radius);
  padding: clamp(18px, 2.6vw, 30px);
  box-shadow: var(--shadow-neon);
}

/* ---------- 8. 编号轨道 ---------- */
.rail { display: grid; gap: 0; border-top: 1px solid rgba(167, 139, 250, 0.14); }

.rail__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 16px 2px;
  border-bottom: 1px solid rgba(167, 139, 250, 0.14);
  transition: background 0.2s ease, padding-left 0.2s ease;
}

.rail__item:hover {
  background: rgba(124, 77, 255, 0.10);
  padding-left: 10px;
}

.rail__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--amber);
  letter-spacing: 0.06em;
}

.rail__body { min-width: 0; color: var(--text); font-weight: 700; }

/* ---------- 9. 标签页 / 筛选 / 手风琴 ---------- */
.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.tabs__tab {
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(26, 23, 48, 0.6);
  font-size: 14px;
  font-weight: 700;
  color: var(--muted);
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.tabs__tab:hover { color: var(--text); border-color: var(--line-cyan); }

.tabs__tab[aria-selected="true"] {
  color: #08060F;
  background: linear-gradient(120deg, var(--cyan), var(--violet));
  border-color: transparent;
}

.tabs__panel[hidden] { display: none; }

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.filter-btn {
  padding: 6px 14px;
  border-radius: 8px;
  border: 1px dashed rgba(167, 139, 250, 0.32);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.filter-btn[aria-pressed="true"] {
  color: #1B1002;
  background: var(--amber);
  border-color: transparent;
  border-style: solid;
}

.accordion { border-top: 1px solid rgba(167, 139, 250, 0.16); }

.accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 16px 0;
  text-align: left;
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 800;
  border-bottom: 1px solid rgba(167, 139, 250, 0.16);
}

.accordion__trigger::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--amber);
  font-size: 18px;
}

.accordion__trigger[aria-expanded="true"]::after { content: "–"; color: var(--cyan); }

.accordion__panel {
  padding: 14px 0 20px;
  color: var(--muted);
  border-bottom: 1px solid rgba(167, 139, 250, 0.16);
}

.accordion__panel[hidden] { display: none; }

/* ---------- 10. 面包屑 ---------- */
.breadcrumbs { font-family: var(--font-mono); font-size: 12px; color: var(--muted); }

.breadcrumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }

.breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(167, 139, 250, 0.5);
}

.breadcrumbs a:hover { color: var(--cyan); }
.breadcrumbs [aria-current="page"] { color: var(--amber); }

/* ---------- 11. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 10% 0%, rgba(124, 77, 255, 0.34), transparent 62%),
    radial-gradient(110% 90% at 100% 100%, rgba(34, 211, 238, 0.26), transparent 64%),
    var(--glass);
  isolation: isolate;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }

.media-frame > img,
.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.06) 0 1px,
    transparent 1px 4px
  );
  mix-blend-mode: screen;
}

.media-frame__caption {
  position: absolute;
  left: 14px;
  bottom: 14px;
  z-index: 2;
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(7, 6, 14, 0.78);
  border: 1px solid var(--line-cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

/* ---------- 12. 跳到主要内容 ---------- */
.skip-link {
  position: absolute;
  left: 12px;
  top: -80px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--amber);
  color: #1B1002;
  font-weight: 800;
  transition: top 0.2s ease;
}

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

/* ---------- 13. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, rgba(11, 10, 20, 0.96), rgba(11, 10, 20, 0.80));
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px) saturate(135%);
  -webkit-backdrop-filter: blur(16px) saturate(135%);
  transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.site-header.is-scrolled {
  background: rgba(7, 6, 14, 0.97);
  border-bottom-color: var(--line-cyan);
  box-shadow: 0 20px 46px -34px rgba(34, 211, 238, 0.95);
}

.site-header__scan {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(167, 139, 250, 0.07) 0 1px,
    transparent 1px 7px
  );
  opacity: 0.5;
}

.site-header__inner {
  position: relative;
  width: min(calc(100% - var(--pad) * 2), var(--wrap));
  margin-inline: auto;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(12px, 3vw, 44px);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(140deg, var(--violet-deep), var(--cyan));
  color: #08060F;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.04em;
  box-shadow: 0 10px 26px -14px rgba(34, 211, 238, 0.95);
  transform: rotate(-4deg);
}

.brand__text { display: grid; gap: 1px; }

.brand__name {
  font-family: var(--font-title);
  font-size: 19px;
  font-weight: 900;
  letter-spacing: 0.01em;
  line-height: 1.2;
  color: var(--text);
}

.brand__note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.brand:hover .brand__name { color: var(--cyan); }

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.6vw, 20px);
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.site-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 9px 12px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 700;
  color: rgba(245, 243, 255, 0.82);
  transition: color 0.2s ease, background 0.2s ease;
}

.site-nav__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(167, 139, 250, 0.78);
  transition: color 0.2s ease;
}

.site-nav__link:hover {
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.08);
}

.site-nav__link:hover .site-nav__num { color: var(--cyan); }

.site-nav__link[aria-current="page"] {
  color: var(--amber);
  background: rgba(245, 185, 66, 0.10);
  box-shadow: inset 0 -2px 0 0 var(--amber);
}

.site-nav__link[aria-current="page"] .site-nav__num { color: var(--amber); }

.site-nav__cta { margin-left: 6px; }

/* 移动按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border-radius: 999px;
  border: 1px solid var(--line-cyan);
  background: rgba(26, 23, 48, 0.72);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--cyan);
  transition: transform 0.24s ease, opacity 0.24s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 滚动进度光带 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  transform-origin: left center;
  transform: scaleX(var(--scroll-progress));
  background: linear-gradient(90deg, var(--violet-deep), var(--cyan) 58%, var(--amber));
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.75);
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 120px);
  overflow: hidden;
  border-top: 1px solid var(--line-cyan);
  background:
    linear-gradient(180deg, rgba(26, 23, 48, 0.92), rgba(7, 6, 14, 0.99) 62%),
    var(--ink-deep);
  color: var(--text);
}

.site-footer__glow {
  position: absolute;
  inset: -40% 40% 40% -20%;
  pointer-events: none;
  background: radial-gradient(60% 60% at 30% 20%, rgba(124, 77, 255, 0.34), transparent 70%);
}

.site-footer__inner {
  position: relative;
  width: min(calc(100% - var(--pad) * 2), var(--wrap));
  margin-inline: auto;
  padding-block: clamp(38px, 5vw, 68px) 24px;
}

.site-footer__top {
  display: grid;
  grid-template-columns: minmax(230px, 1.05fr) minmax(0, 1.9fr) minmax(240px, 1.1fr);
  gap: clamp(26px, 4vw, 56px);
  padding-bottom: clamp(28px, 4vw, 48px);
  border-bottom: 1px solid rgba(167, 139, 250, 0.16);
}

.site-footer__brand { display: grid; gap: 16px; align-content: start; }

.brand--footer { gap: 12px; }

.brand--footer .brand__name { font-size: 20px; }

.site-footer__tagline {
  font-size: 14px;
  line-height: 1.6;
  color: var(--muted);
  max-width: 30ch;
}

.site-footer__status { display: flex; flex-wrap: wrap; gap: 8px; }

.site-footer__columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 34px);
}

.site-footer__col { display: grid; gap: 12px; align-content: start; }

.site-footer__col-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.site-footer__list { display: grid; gap: 9px; }

.site-footer__link {
  font-size: 15px;
  font-weight: 600;
  color: rgba(245, 243, 255, 0.82);
  transition: color 0.2s ease, transform 0.2s ease;
  display: inline-block;
}

.site-footer__link:hover { color: var(--amber); transform: translateX(3px); }

.site-footer__contact { display: grid; gap: 12px; align-content: start; }

.site-footer__contact-list { display: grid; gap: 12px; }

.site-footer__contact-row { display: grid; gap: 2px; }

.site-footer__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: rgba(168, 163, 194, 0.85);
}

.site-footer__v {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
  word-break: break-word;
}

.site-footer__note {
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 42ch;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-top: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(168, 163, 194, 0.9);
}

.site-footer__legal { color: rgba(168, 163, 194, 0.9); }

.site-footer__copy { color: var(--muted); }

/* ---------- 15. 进入动效协议 ---------- */
.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

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

/* ---------- 16. 响应式 ---------- */
@media (max-width: 1080px) {
  .site-footer__top {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
  .site-footer__contact { grid-column: 1 / -1; }
  .site-footer__contact-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--asym { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 980px) {
  :root { --header-h: 66px; }

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

  .site-nav {
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    z-index: 90;
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    margin-left: 0;
    padding: 18px var(--pad) 24px;
    background: linear-gradient(180deg, rgba(11, 10, 20, 0.99), rgba(7, 6, 14, 0.99));
    border-bottom: 1px solid var(--line-cyan);
    box-shadow: 0 28px 60px -34px rgba(34, 211, 238, 0.85);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity 0.24s ease, transform 0.24s ease, visibility 0.24s ease;
  }

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

  .site-nav__list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 6px;
  }

  .site-nav__link {
    padding: 12px 12px;
    font-size: 16px;
    background: rgba(26, 23, 48, 0.5);
    border: 1px solid rgba(167, 139, 250, 0.14);
  }

  .site-nav__cta { align-self: flex-start; }

  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer__columns { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  body { font-size: 16px; }

  .brand__note { display: none; }

  .grid--2,
  .grid--3,
  .grid--asym { grid-template-columns: minmax(0, 1fr); }

  .site-footer__top { grid-template-columns: minmax(0, 1fr); }
  .site-footer__columns { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer__contact-list { grid-template-columns: minmax(0, 1fr); }

  .rail__item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .section__head { flex-direction: column; align-items: flex-start; }

  .tabs__list,
  .filter-bar { gap: 6px; }
}

@media (max-width: 420px) {
  .site-nav__list { grid-template-columns: minmax(0, 1fr); }
  .brand__mark { width: 34px; height: 34px; border-radius: 10px; font-size: 13px; }
  .brand__name { font-size: 17px; }
}

/* ---------- 17. 无障碍与减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

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

  .btn:hover,
  .site-footer__link:hover,
  .rail__item:hover { transform: none; }
}