/* ==========================================================================
   幻影体育台 · /assets/site.css
   共享层：reset / 变量 / 中文排版 / 页头 / 页脚 / 通用组件 / 图片容器 / 响应式
   ========================================================================== */

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

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

body,
h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }

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

img, 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; }

/* ---------- 变量 ---------- */
:root {
  --night-black: #0B0A12;
  --void-gray: #16141F;
  --phantom-purple: #6C3BF4;
  --deep-purple: #3A2A6E;
  --electric-blue: #2BE0FF;
  --neon-green: #B4FF3A;
  --ember-orange: #FF5A36;
  --paper-cream: #F2E9D8;
  --ink-brown: #241E1A;
  --text-white: #F7F5FF;

  --line-soft: rgba(108, 59, 244, .34);
  --line-cyan: rgba(43, 224, 255, .42);
  --line-grid: rgba(58, 42, 110, .55);
  --glass-fill: rgba(22, 20, 31, .62);
  --dim: rgba(247, 245, 255, .56);
  --dim-2: rgba(247, 245, 255, .38);

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

  --shell-max: 1280px;
  --gutter: clamp(16px, 4vw, 40px);
  --header-h: 68px;
  --radius: 2px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --slant: 18px;
}

/* ---------- 基础排版（中文） ---------- */
body {
  min-height: 100vh;
  background-color: var(--night-black);
  color: var(--text-white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line-grid) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-grid) 1px, transparent 1px),
    radial-gradient(circle at 78% 8%, rgba(108, 59, 244, .26), transparent 55%),
    radial-gradient(circle at 4% 82%, rgba(43, 224, 255, .10), transparent 58%);
  background-size: 72px 72px, 72px 72px, 100% 100%, 100% 100%;
  opacity: .55;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -.015em;
  line-height: 1.16;
}

h1 { font-size: clamp(32px, 5.4vw, 62px); }
h2 { font-size: clamp(24px, 3.4vw, 40px); }
h3 { font-size: clamp(18px, 2vw, 24px); }

p { max-width: 62ch; }

strong { color: var(--text-white); font-weight: 700; }

::selection { background: var(--phantom-purple); color: #fff; }

:focus-visible {
  outline: 2px solid var(--electric-blue);
  outline-offset: 3px;
}

/* ---------- 容器 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

main { position: relative; z-index: 1; }

/* ---------- 跳至主内容 ---------- */
.skip-link {
  position: absolute;
  top: -120px;
  left: var(--gutter);
  z-index: 400;
  padding: 10px 18px;
  background: var(--electric-blue);
  color: #041318;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  border-radius: var(--radius);
  transition: top .2s var(--ease);
}

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

/* ==========================================================================
   页头
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 10, 18, .84);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-soft);
  transition: background-color .3s var(--ease), box-shadow .3s var(--ease);
}

.site-header.is-condensed {
  background: rgba(11, 10, 18, .96);
  box-shadow: 0 20px 44px rgba(0, 0, 0, .55);
}

.header-grid {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(12px, 2.2vw, 32px);
  min-height: var(--header-h);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding-block: 10px;
  flex: none;
}

.brand__signal {
  width: 9px;
  height: 9px;
  flex: none;
  border-radius: 50%;
  background: var(--neon-green);
  box-shadow: 0 0 0 4px rgba(180, 255, 58, .14), 0 0 12px rgba(180, 255, 58, .8);
  animation: brandPulse 2.8s var(--ease) infinite;
}

@keyframes brandPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .32; }
}

.brand__text { display: flex; flex-direction: column; line-height: 1.1; }

.brand__mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(15px, 1.5vw, 18px);
  letter-spacing: .07em;
  color: var(--text-white);
  white-space: nowrap;
}

.brand__tagline {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--dim-2);
  white-space: nowrap;
}

/* 移动开合按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 13px;
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius);
  background: rgba(43, 224, 255, .05);
  color: var(--electric-blue);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  transition: background-color .2s var(--ease), box-shadow .2s var(--ease);
}

.nav-toggle:hover { background: rgba(43, 224, 255, .13); box-shadow: 0 0 16px rgba(43, 224, 255, .25); }

.nav-toggle__bars { display: flex; flex-direction: column; gap: 4px; width: 16px; }

.nav-toggle__bars i {
  display: block;
  height: 1.5px;
  background: currentColor;
  transition: transform .22s var(--ease), opacity .22s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

.nav-toggle__text { line-height: 1; }

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(10px, 2vw, 26px);
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.7vw, 24px);
  min-width: 0;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
  counter-reset: navIndex;
}

.nav-list::-webkit-scrollbar { display: none; }

.nav-list__item { position: relative; flex: none; }

.nav-list__item::before {
  content: "";
  position: absolute;
  top: 50%;
  left: -8px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--electric-blue);
  box-shadow: 0 0 9px var(--electric-blue);
  transform: translateY(-50%) scale(0);
  transition: transform .24s var(--ease);
}

.nav-list__item:has(.nav-link[aria-current="page"])::before { transform: translateY(-50%) scale(1); }

.nav-link {
  position: relative;
  display: block;
  padding: 9px 2px;
  font-size: 14px;
  letter-spacing: .04em;
  color: rgba(247, 245, 255, .72);
  white-space: nowrap;
  transition: color .2s var(--ease);
}

.nav-link::before {
  counter-increment: navIndex;
  content: counter(navIndex, decimal-leading-zero);
  margin-right: 7px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--ember-orange);
  opacity: .8;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--electric-blue);
  box-shadow: 0 0 10px rgba(43, 224, 255, .75);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .24s var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible { color: var(--text-white); }

.nav-link:hover::after { transform: scaleX(1); }

.nav-link[aria-current="page"] { color: var(--text-white); }

.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.nav-link[aria-current="page"]::before { color: var(--electric-blue); opacity: 1; }

.nav-foot { display: none; }

/* 头部动作区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: none;
}

/* 刻度尺 + 进度 */
.header-ruler {
  position: relative;
  height: 9px;
  pointer-events: none;
  overflow: hidden;
}

.header-ruler__line {
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(108, 59, 244, .8) 0 1px, transparent 1px 26px);
  opacity: .55;
}

.progress {
  position: relative;
  height: 2px;
  background: rgba(58, 42, 110, .55);
}

.progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--phantom-purple), var(--electric-blue));
  box-shadow: 0 0 14px rgba(43, 224, 255, .7);
  transition: width .12s linear;
}

/* ==========================================================================
   按钮
   ========================================================================== */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-family: var(--font-body);
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: .06em;
  border: 1px solid transparent;
  border-radius: var(--radius);
  white-space: nowrap;
  cursor: pointer;
  transition: transform .22s var(--ease), background-color .22s var(--ease),
              color .22s var(--ease), border-color .22s var(--ease), box-shadow .22s var(--ease);
}

.btn--primary {
  background: var(--phantom-purple);
  color: #fff;
  box-shadow: 0 0 0 1px rgba(108, 59, 244, .55), 0 12px 26px rgba(108, 59, 244, .3);
}

.btn--primary:hover {
  background: #7B4DFF;
  transform: translateY(-2px);
  box-shadow: 0 0 0 1px var(--electric-blue), 0 16px 32px rgba(43, 224, 255, .28);
}

.btn--ghost {
  background: rgba(43, 224, 255, .05);
  color: var(--electric-blue);
  border-color: var(--line-cyan);
}

.btn--ghost:hover {
  background: rgba(43, 224, 255, .14);
  border-color: var(--electric-blue);
  transform: translateY(-2px);
  box-shadow: 0 0 20px rgba(43, 224, 255, .28);
}

.btn--paper {
  background: var(--paper-cream);
  color: var(--ink-brown);
  border-color: rgba(36, 30, 26, .22);
}

.btn--paper:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(0, 0, 0, .45); }

.btn--sm { padding: 7px 13px; font-size: 12.5px; }

.btn--block { width: 100%; }

/* ==========================================================================
   通用组件
   ========================================================================== */
.section {
  position: relative;
  z-index: 1;
  padding-block: clamp(44px, 7vw, 100px);
}

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px 32px;
  padding-bottom: 14px;
  margin-bottom: clamp(20px, 3vw, 38px);
  border-bottom: 1px solid var(--line-grid);
  transition: border-color .35s var(--ease);
}

.section[data-spy].is-current .section__head { border-bottom-color: var(--electric-blue); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--electric-blue);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--ember-orange);
}

.section[data-spy].is-current .eyebrow { color: var(--neon-green); }

.index-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(56px, 12vw, 148px);
  line-height: .85;
  letter-spacing: -.04em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(108, 59, 244, .72);
}

.index-num--solid {
  color: var(--text-white);
  -webkit-text-stroke: 0;
}

.divider-slant {
  height: 1px;
  margin-block: clamp(28px, 4vw, 56px);
  background: linear-gradient(90deg, transparent, rgba(108, 59, 244, .8) 22%, rgba(43, 224, 255, .6) 62%, transparent);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  border: 1px solid var(--line-cyan);
  border-radius: 999px;
  color: var(--electric-blue);
}

.tag--live { color: var(--neon-green); border-color: rgba(180, 255, 58, .45); }
.tag--index { color: var(--ember-orange); border-color: rgba(255, 90, 54, .45); }

.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 14px;
  border-left: 1px solid var(--line-cyan);
}

.stat__value {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.8vw, 32px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--text-white);
}

.stat__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--dim);
}

.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 30px);
  background: var(--void-gray);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}

.panel--glass {
  background: var(--glass-fill);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.panel--paper {
  background: var(--paper-cream);
  color: var(--ink-brown);
  border-color: rgba(36, 30, 26, .18);
}

.panel--slant {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--slant)), calc(100% - var(--slant)) 100%, 0 100%);
}

/* 阅读区 */
.prose {
  padding: clamp(24px, 4vw, 56px);
  background: var(--paper-cream);
  color: var(--ink-brown);
  border-radius: var(--radius);
  line-height: 1.85;
}

.prose h2,
.prose h3,
.prose h4 { color: var(--ink-brown); margin-bottom: .6em; }

.prose h2 { font-size: clamp(22px, 2.8vw, 32px); }
.prose h3 { font-size: clamp(18px, 2vw, 23px); }

.prose p { margin-bottom: 1.1em; color: rgba(36, 30, 26, .88); }

.prose a {
  color: #7A2B12;
  border-bottom: 1px solid rgba(122, 43, 18, .4);
  transition: border-color .2s var(--ease);
}

.prose a:hover { border-bottom-color: #7A2B12; }

.prose ul { list-style: none; margin: 0 0 1.1em; }

.prose li {
  position: relative;
  padding-left: 18px;
  margin-bottom: .5em;
  color: rgba(36, 30, 26, .88);
}

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .75em;
  width: 7px;
  height: 1px;
  background: var(--ember-orange);
}

.prose blockquote {
  margin: 1.4em 0;
  padding: 12px 0 12px 20px;
  border-left: 2px solid var(--phantom-purple);
  color: rgba(36, 30, 26, .72);
}

/* 网格 */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 28px);
}

.col-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

/* 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  padding-block: 20px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--dim-2);
}

.breadcrumb li { display: inline-flex; align-items: center; }

.breadcrumb li + li::before {
  content: "/";
  margin-inline: 10px;
  color: var(--ember-orange);
}

.breadcrumb a { color: var(--dim); transition: color .2s var(--ease); }

.breadcrumb a:hover { color: var(--electric-blue); }

/* 图片容器基础规则 */
.media-frame {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  background: linear-gradient(135deg, var(--void-gray) 0%, #0F0D18 60%, rgba(108, 59, 244, .22) 100%);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}

.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }

.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.92) contrast(1.06);
}

.media-frame__grid {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: .5;
  mix-blend-mode: screen;
  background-image:
    linear-gradient(to right, rgba(43, 224, 255, .28) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(43, 224, 255, .2) 1px, transparent 1px);
  background-size: 40px 40px, 40px 40px;
}

.media-frame__scan {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 42%;
  z-index: 2;
  pointer-events: none;
  background: linear-gradient(180deg, transparent, rgba(11, 10, 18, .88));
}

.media-frame__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 3;
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--text-white);
}

.media-frame__index {
  position: absolute;
  top: 0;
  right: 0;
  z-index: 3;
  padding: 6px 11px;
  background: var(--phantom-purple);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .14em;
}

/* 显现与回到顶部 */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
}

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

.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 32px);
  bottom: clamp(14px, 3vw, 32px);
  z-index: 90;
  display: none;
  align-items: center;
  gap: 8px;
  padding: 10px 15px;
  background: rgba(11, 10, 18, .88);
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius);
  color: var(--electric-blue);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: box-shadow .22s var(--ease), transform .22s var(--ease);
}

.to-top[data-visible="true"] { display: inline-flex; }

.to-top:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 20px rgba(43, 224, 255, .3);
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: clamp(56px, 9vw, 120px);
  background: linear-gradient(180deg, rgba(22, 20, 31, .25), var(--void-gray) 26%);
  border-top: 1px solid var(--line-soft);
  color: var(--text-white);
}

.footer-bevel {
  height: 34px;
  border-bottom: 1px solid rgba(58, 42, 110, .6);
  background-image: repeating-linear-gradient(115deg,
    rgba(108, 59, 244, .5) 0 2px,
    transparent 2px 10px);
  opacity: .5;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr .85fr .85fr 1.25fr;
  gap: clamp(24px, 4vw, 56px);
  padding-block: clamp(36px, 5vw, 64px);
}

.footer-brand__mark {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(20px, 2.4vw, 26px);
  letter-spacing: .07em;
  color: var(--text-white);
  transition: color .2s var(--ease);
}

.footer-brand__mark:hover { color: var(--electric-blue); }

.footer-brand__tagline {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--dim);
  max-width: none;
}

.footer-brand__coord {
  margin-top: 14px;
  padding-left: 12px;
  border-left: 1px solid rgba(255, 90, 54, .6);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .2em;
  color: var(--ember-orange);
  max-width: none;
}

.footer-brand__domain {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--dim-2);
  max-width: none;
  word-break: break-all;
}

.footer-col__title {
  margin-bottom: 14px;
  padding-bottom: 9px;
  border-bottom: 1px solid rgba(43, 224, 255, .22);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: .2em;
  color: var(--electric-blue);
}

.footer-list li {
  padding: 6px 0;
  font-size: 14px;
  color: rgba(247, 245, 255, .68);
}

.footer-list a {
  display: inline-block;
  transition: color .2s var(--ease), transform .2s var(--ease);
}

.footer-list a:hover {
  color: var(--electric-blue);
  transform: translateX(3px);
}

.footer-list--plain li {
  display: flex;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--dim);
  word-break: break-all;
}

.footer-label {
  flex: none;
  min-width: 34px;
  font-size: 10.5px;
  letter-spacing: .14em;
  color: var(--ember-orange);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-block: 18px;
  border-top: 1px dashed rgba(58, 42, 110, .85);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--dim-2);
}

.footer-base p { max-width: none; }

.footer-note {
  max-width: 900px;
  padding-bottom: clamp(28px, 4vw, 44px);
  font-size: 12px;
  line-height: 1.85;
  color: rgba(247, 245, 255, .42);
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1080px) {
  .brand__tagline { display: none; }
  .header-grid { grid-template-columns: auto minmax(0, 1fr) auto; }
}

@media (max-width: 900px) {
  .header-grid { grid-template-columns: minmax(0, 1fr) auto; }

  .header-actions { display: none; }

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

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    padding: 14px var(--gutter) 26px;
    background: rgba(11, 10, 18, .98);
    border-bottom: 1px solid var(--line-soft);
    box-shadow: 0 26px 50px rgba(0, 0, 0, .6);
  }

  .site-nav[data-open="true"] { display: flex; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    overflow: visible;
  }

  .nav-list__item { border-bottom: 1px solid rgba(58, 42, 110, .55); }

  .nav-list__item::before { display: none; }

  .nav-link { padding: 15px 0; font-size: 16px; }

  .nav-link::after { display: none; }

  .nav-link[aria-current="page"] { color: var(--electric-blue); }

  .nav-foot {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 22px;
  }

  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }

  .col-4, .col-6, .col-8 { grid-column: span 6; }

  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 560px) {
  :root { --header-h: 62px; --slant: 14px; }

  .grid-12 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .col-4, .col-6, .col-8 { grid-column: span 2; }

  .footer-grid { grid-template-columns: 1fr; }

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

  .nav-toggle__text { display: none; }
}

@media (max-width: 900px) {
  body.nav-open { overflow: hidden; }
}

/* ==========================================================================
   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;
  }

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

  .progress__bar { transition: none; }
}