/* =========================================================
   奔驰宝马开服 · 全站共享样式表 /assets/site.css
   框架式导航 · 午夜车库 · 仪表盘刻度语言
   ========================================================= */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; }
h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video, canvas { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
table { width: 100%; border-collapse: collapse; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  --c-midnight: #060A12;
  --c-graphite: #141B26;
  --c-graphite-soft: #1B2431;
  --c-silver: #C7CDD4;
  --c-silver-dim: #7E8899;
  --c-blue: #0B1B33;
  --c-blue-soft: #122A4D;
  --c-neon: #19F5D0;
  --c-orange: #FF6A1A;
  --c-green: #7CFF9E;
  --c-violet: #8B5CFF;
  --c-white: #F4F7FA;

  --line: rgba(199, 205, 212, 0.14);
  --line-strong: rgba(199, 205, 212, 0.28);
  --line-neon: rgba(25, 245, 208, 0.34);

  --font-display: 'Barlow Condensed', 'Oswald', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
  --font-data: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Courier New', monospace;

  --wrap: 1440px;
  --gutter: clamp(1rem, 4vw, 3rem);
  --header-h: 72px;
  --skew: -1.6deg;
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --glow-neon: 0 0 22px rgba(25, 245, 208, 0.45);
  --glow-orange: 0 0 22px rgba(255, 106, 26, 0.5);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--c-midnight);
  background-image:
    radial-gradient(90% 55% at 6% -6%, rgba(25, 245, 208, 0.09), transparent 62%),
    radial-gradient(78% 52% at 104% 3%, rgba(139, 92, 255, 0.10), transparent 60%),
    radial-gradient(72% 46% at 50% 104%, rgba(255, 106, 26, 0.06), transparent 62%);
  background-repeat: no-repeat;
  color: var(--c-silver);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1.14;
  color: var(--c-white);
  text-wrap: balance;
}
h1 { font-size: clamp(2.25rem, 5.4vw, 4.5rem); }
h2 { font-size: clamp(1.75rem, 3.4vw, 2.5rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.45rem); }
h4 { font-size: 1.05rem; letter-spacing: 0.12em; }
h5 { font-size: 0.95rem; letter-spacing: 0.16em; color: var(--c-silver); }

.glow { text-shadow: var(--glow-neon); }
.glow--orange { text-shadow: var(--glow-orange); }

.prose { max-width: 42em; }
.prose p + p { margin-top: 0.9em; }
.prose strong { color: var(--c-white); font-weight: 700; }

code, kbd, samp, .num {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

::selection { background: rgba(25, 245, 208, 0.28); color: var(--c-white); }

/* ---------- 4. 焦点与无障碍 ---------- */
:focus-visible {
  outline: 2px solid var(--c-neon);
  outline-offset: 3px;
  border-radius: 2px;
}
#main-content { display: block; scroll-margin-top: calc(var(--header-h) + 1rem); }
#main-content:focus { outline: none; }

.skip-link {
  position: absolute;
  top: 0.6rem;
  left: 0.75rem;
  z-index: 220;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.6rem 1.1rem;
  background: var(--c-neon);
  color: #04120F;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: 3px;
  box-shadow: var(--glow-neon);
  transform: translateY(-160%);
  transition: transform 0.22s var(--ease);
}
.skip-link:focus { transform: translateY(0); color: #04120F; }

/* ---------- 5. 通用容器与分屏 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.split-shell {
  display: grid;
  grid-template-columns: minmax(260px, 4fr) minmax(0, 8fr);
  gap: clamp(1.5rem, 3vw, 3rem);
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.rail-sticky {
  position: sticky;
  top: calc(var(--header-h) + 1.5rem);
  align-self: start;
}

/* ---------- 6. 编辑部式标题组 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--c-neon);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--c-neon);
  box-shadow: var(--glow-neon);
}

.section-head { margin-bottom: clamp(1.25rem, 2.5vw, 2rem); }
.section-title { margin-bottom: 0.5rem; }
.section-lede {
  max-width: 42em;
  color: var(--c-silver-dim);
  font-size: 0.98rem;
}

.rule {
  height: 9px;
  border: 0;
  margin: clamp(1.5rem, 3vw, 2.5rem) 0;
  background-image:
    linear-gradient(90deg, rgba(199, 205, 212, 0.26) 0 1px, transparent 1px),
    linear-gradient(90deg, rgba(25, 245, 208, 0.44) 0 1px, transparent 1px);
  background-size: 14px 5px, 70px 9px;
  background-position: left bottom, left bottom;
  background-repeat: repeat-x;
}

/* ---------- 7. 按钮族 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.72rem 1.35rem;
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-white);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 2px;
  cursor: pointer;
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease),
              background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.btn--cta {
  color: #180702;
  background: linear-gradient(135deg, var(--c-orange) 0%, #FF9147 100%);
  box-shadow: 0 10px 26px -14px rgba(255, 106, 26, 0.95);
}
.btn--cta:hover,
.btn--cta:focus-visible {
  color: #180702;
  transform: translateY(-1px);
  box-shadow: 0 16px 32px -14px rgba(255, 106, 26, 1);
}
.btn--ghost {
  color: var(--c-neon);
  border-color: var(--line-neon);
}
.btn--ghost:hover,
.btn--ghost:focus-visible {
  color: var(--c-white);
  background: rgba(25, 245, 208, 0.12);
}
.btn--quiet {
  color: var(--c-silver);
  background: rgba(20, 27, 38, 0.72);
  border-color: var(--line-strong);
}
.btn--quiet:hover,
.btn--quiet:focus-visible {
  color: var(--c-white);
  border-color: var(--line-neon);
}

/* ---------- 8. 数据与标签 ---------- */
.stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.9rem 1rem;
  border-left: 2px solid var(--line-neon);
  background: linear-gradient(120deg, rgba(11, 27, 51, 0.6), rgba(6, 10, 18, 0));
}
.stat__value {
  font-family: var(--font-data);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1.05;
  color: var(--c-neon);
  font-variant-numeric: tabular-nums;
  text-shadow: var(--glow-neon);
}
.stat__label {
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-silver-dim);
}

.data-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.18rem 0.55rem;
  font-family: var(--font-data);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  color: var(--c-silver);
  background: rgba(20, 27, 38, 0.6);
  white-space: nowrap;
}
.data-chip--gate {
  color: var(--c-orange);
  border-color: rgba(255, 106, 26, 0.55);
  background: rgba(255, 106, 26, 0.09);
}
.data-chip--ok {
  color: var(--c-green);
  border-color: rgba(124, 255, 158, 0.45);
  background: rgba(124, 255, 158, 0.08);
}
.data-chip--time {
  color: var(--c-neon);
  border-color: var(--line-neon);
  background: rgba(25, 245, 208, 0.08);
}

/* ---------- 9. 筛选条 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  padding: 0.35rem;
  margin-bottom: clamp(1rem, 2vw, 1.75rem);
  border: 1px solid var(--line);
  border-radius: 3px;
  background: rgba(20, 27, 38, 0.6);
}
.filter-btn {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0.45rem 1rem;
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-silver-dim);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 2px;
  cursor: pointer;
  transition: color 0.18s var(--ease), background 0.18s var(--ease),
              border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}
.filter-btn:hover { color: var(--c-white); background: rgba(25, 245, 208, 0.08); }
.filter-btn.is-active,
.filter-btn[aria-pressed="true"] {
  color: #04120F;
  background: var(--c-neon);
  border-color: var(--c-neon);
  box-shadow: 0 0 18px -4px rgba(25, 245, 208, 0.9);
}
[data-filter-tag].is-filtered-out { display: none; }

/* ---------- 10. 图片容器 ---------- */
.media-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px 3px 16px 3px;
  background:
    radial-gradient(120% 90% at 18% 0%, rgba(25, 245, 208, 0.16), transparent 62%),
    radial-gradient(100% 80% at 92% 100%, rgba(255, 106, 26, 0.14), transparent 62%),
    linear-gradient(158deg, var(--c-blue) 0%, var(--c-midnight) 100%);
}
.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(
    0deg,
    rgba(244, 247, 250, 0.04) 0 1px,
    transparent 1px 4px
  );
}
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--wide { aspect-ratio: 21 / 9; }

/* ---------- 11. 索引网格与底板 ---------- */
.grid-index {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: clamp(1rem, 2vw, 1.75rem);
}

.card-plate {
  position: relative;
  padding: clamp(1rem, 2vw, 1.5rem);
  background: linear-gradient(150deg, rgba(11, 27, 51, 0.72), rgba(6, 10, 18, 0.35));
  border: 1px solid var(--line);
  border-radius: 3px 18px 3px 18px;
  transition: border-color 0.24s var(--ease), box-shadow 0.24s var(--ease),
              transform 0.24s var(--ease);
}
.card-plate:hover {
  border-color: var(--line-neon);
  box-shadow: 0 0 28px -12px rgba(25, 245, 208, 0.85);
  transform: translateY(-2px);
}

/* ---------- 12. 面包屑 ---------- */
.breadcrumbs {
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--c-silver-dim);
}
.breadcrumbs ol { display: flex; flex-wrap: wrap; align-items: center; gap: 0.4rem; }
.breadcrumbs li { display: inline-flex; align-items: center; gap: 0.4rem; }
.breadcrumbs li + li::before { content: "/"; color: rgba(199, 205, 212, 0.32); }
.breadcrumbs a:hover { color: var(--c-neon); }
.breadcrumbs [aria-current="page"] { color: var(--c-silver); }

/* ---------- 13. 头部 · 框架式档位条 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, rgba(9, 20, 38, 0.98) 0%, rgba(6, 10, 18, 0.98) 100%);
  border-bottom: 1px solid var(--line-neon);
  box-shadow: 0 20px 44px -30px rgba(0, 0, 0, 0.98), inset 0 1px 0 rgba(244, 247, 250, 0.06);
}

.header-beam {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.62rem 0 0.5rem;
}

.header-main {
  display: flex;
  align-items: stretch;
  gap: clamp(0.75rem, 2vw, 2rem);
  border-top: 1px solid var(--line);
  padding-bottom: 0.2rem;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  min-height: 44px;
  color: inherit;
}
.brand-mark {
  position: relative;
  flex: none;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line-neon);
  border-radius: 2px;
  background: linear-gradient(145deg, var(--c-blue) 0%, var(--c-midnight) 100%);
  box-shadow: 0 0 22px -8px rgba(25, 245, 208, 0.9), inset 0 0 12px rgba(25, 245, 208, 0.14);
}
.brand-mark span {
  position: absolute;
  display: block;
  width: 3px;
  height: 19px;
  background: var(--c-neon);
  box-shadow: var(--glow-neon);
  transform: rotate(20deg);
}
.brand-mark span:first-child { left: 12px; }
.brand-mark span:last-child {
  right: 12px;
  height: 14px;
  background: var(--c-orange);
  box-shadow: var(--glow-orange);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name {
  font-family: var(--font-display);
  font-size: 1.32rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-white);
  text-shadow: var(--glow-neon);
}
.brand-tagline {
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-silver-dim);
}

/* 工具区与倒计时 */
.header-utility {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
}
.countdown {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.35rem 0.8rem;
  border: 1px solid var(--line-neon);
  border-radius: 2px;
  background: rgba(11, 27, 51, 0.82);
}
.countdown__label {
  display: inline-flex;
  align-items: center;
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-silver-dim);
  white-space: nowrap;
}
.countdown__label::before {
  content: "";
  width: 6px;
  height: 6px;
  margin-right: 0.42rem;
  border-radius: 50%;
  background: var(--c-green);
  box-shadow: 0 0 8px var(--c-green);
  animation: pulse 2.4s ease-in-out infinite;
}
.countdown__value {
  font-family: var(--font-data);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  font-variant-numeric: tabular-nums;
  color: var(--c-neon);
  text-shadow: var(--glow-neon);
}
.utility-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 44px;
  padding: 0.45rem 0.8rem;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  color: var(--c-silver-dim);
  border: 1px solid rgba(199, 205, 212, 0.16);
  border-radius: 2px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.utility-link:hover,
.utility-link:focus-visible {
  color: var(--c-neon);
  border-color: var(--line-neon);
  background: rgba(25, 245, 208, 0.07);
}

/* 移动开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.65rem;
  min-height: 44px;
  min-width: 44px;
  padding: 0.5rem 0.95rem;
  color: var(--c-white);
  background: rgba(11, 27, 51, 0.85);
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  cursor: pointer;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.nav-toggle:hover { border-color: var(--line-neon); background: rgba(25, 245, 208, 0.1); }
.nav-toggle__bars { display: block; width: 18px; }
.nav-toggle__bars span {
  display: block;
  height: 2px;
  margin: 3px 0;
  background: var(--c-neon);
  transition: transform 0.25s var(--ease), opacity 0.2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) 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(-5px) rotate(-45deg); }
.nav-toggle__text {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

/* 档位导航 */
.site-nav { flex: 1 1 auto; min-width: 0; }
.nav-gears { display: flex; flex-wrap: wrap; align-items: center; gap: 0.12rem; }
.nav-gears a {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  min-height: 44px;
  padding: 0.62rem 0.95rem;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--c-silver-dim);
  border: 1px solid transparent;
  border-radius: 2px;
  white-space: nowrap;
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}
.nav-gears a::before {
  content: "";
  flex: none;
  width: 5px;
  height: 5px;
  background: currentColor;
  opacity: 0.4;
  transform: rotate(45deg);
  transition: opacity 0.18s var(--ease), background 0.18s var(--ease);
}
.nav-gears a:hover { color: var(--c-white); background: rgba(25, 245, 208, 0.07); }
.nav-gears a:hover::before { opacity: 1; background: var(--c-neon); }
.nav-gears a[aria-current="page"] {
  color: var(--c-white);
  border-color: rgba(25, 245, 208, 0.42);
  background: linear-gradient(180deg, rgba(25, 245, 208, 0.16), rgba(11, 27, 51, 0.2));
  box-shadow: 0 0 22px -6px rgba(25, 245, 208, 0.6);
}
.nav-gears a[aria-current="page"]::before {
  opacity: 1;
  background: var(--c-neon);
  box-shadow: var(--glow-neon);
}
.nav-gears a[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0.95rem;
  right: 0.95rem;
  bottom: 3px;
  height: 2px;
  background: linear-gradient(90deg, var(--c-neon), rgba(25, 245, 208, 0));
}

.nav-shortcuts { display: none; }

/* 刻度尺 */
.header-rail {
  flex: 0 0 auto;
  align-self: flex-end;
  margin-left: auto;
  width: clamp(80px, 20vw, 320px);
  height: 10px;
  background-image:
    linear-gradient(90deg, rgba(199, 205, 212, 0.28) 0 1px, transparent 1px),
    linear-gradient(90deg, rgba(25, 245, 208, 0.5) 0 1px, transparent 1px);
  background-size: 14px 5px, 70px 10px;
  background-position: left bottom, left bottom;
  background-repeat: repeat-x;
}

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-neon) 0%, var(--c-violet) 55%, var(--c-orange) 100%);
  box-shadow: 0 0 14px rgba(25, 245, 208, 0.85);
  transform: scaleX(0);
  transform-origin: 0 50%;
  will-change: transform;
}

body.is-nav-open { overflow: hidden; }

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.86); }
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 6rem);
  background: linear-gradient(180deg, rgba(11, 27, 51, 0.8) 0%, rgba(6, 10, 18, 1) 72%);
  border-top: 1px solid var(--line-neon);
  color: var(--c-silver-dim);
}
.site-footer::before {
  content: "";
  display: block;
  height: 10px;
  background-image:
    linear-gradient(90deg, rgba(199, 205, 212, 0.2) 0 1px, transparent 1px),
    linear-gradient(90deg, rgba(25, 245, 208, 0.34) 0 1px, transparent 1px);
  background-size: 14px 5px, 70px 10px;
  background-position: left bottom, left bottom;
  background-repeat: repeat-x;
}
.footer-inner {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(2.25rem, 5vw, 4rem) var(--gutter) 1.5rem;
}
.footer-top {
  display: grid;
  grid-template-columns: minmax(240px, 1.4fr) repeat(3, minmax(130px, 1fr));
  gap: clamp(1.5rem, 3vw, 3rem);
}
.footer-brand__name {
  margin-bottom: 0.2rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-white);
  text-shadow: var(--glow-neon);
}
.footer-brand__tag {
  margin-bottom: 1rem;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--c-neon);
}
.footer-brand__note {
  max-width: 34em;
  font-size: 0.85rem;
  line-height: 1.85;
  color: var(--c-silver-dim);
}
.footer-col__title {
  position: relative;
  margin-bottom: 0.9rem;
  padding-bottom: 0.55rem;
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-neon);
}
.footer-col__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 1px;
  background: var(--c-neon);
  box-shadow: var(--glow-neon);
}
.footer-list { display: grid; gap: 0.1rem; }
.footer-list a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: 0.9rem;
  color: var(--c-silver);
  transition: color 0.18s var(--ease), transform 0.18s var(--ease);
}
.footer-list a:hover,
.footer-list a:focus-visible { color: var(--c-white); transform: translateX(3px); }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1.5rem;
  margin-top: clamp(2rem, 4vw, 3rem);
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: 0.8rem;
  color: var(--c-silver-dim);
}
.footer-legal__copy { margin: 0; }
.footer-legal__mail {
  margin: 0;
  padding: 0.28rem 0.65rem;
  font-family: var(--font-data);
  font-size: 0.8rem;
  color: var(--c-silver);
  border: 1px solid rgba(199, 205, 212, 0.2);
  border-radius: 2px;
}
.footer-legal__icp { margin: 0; letter-spacing: 0.04em; }

/* ---------- 15. 显现动效 ---------- */
[data-reveal] { opacity: 1; transform: none; }
html.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
html.has-js [data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 16. 响应式 ---------- */
@media (max-width: 1180px) {
  .header-utility .utility-link { display: none; }
}

@media (max-width: 1024px) {
  .nav-toggle { display: inline-flex; }
  .header-utility .btn { display: none; }
  .header-utility { gap: 0.35rem; }
  .countdown { padding: 0.3rem 0.6rem; }
  .countdown__label { letter-spacing: 0.12em; }

  .header-main { padding-bottom: 0; }
  .header-rail { width: 100%; margin-left: 0; }

  .site-nav {
    position: fixed;
    top: var(--header-h, 72px);
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 70;
    overflow-y: auto;
    padding: 1.35rem var(--gutter) 3rem;
    background: linear-gradient(172deg, rgba(11, 27, 51, 0.99) 0%, rgba(6, 10, 18, 0.995) 58%, #060A12 100%);
    border-top: 1px solid var(--line-neon);
    transform: translateY(-14px);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s var(--ease), opacity 0.3s var(--ease), visibility 0.3s;
  }
  .site-nav[data-open] {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  .nav-gears { flex-direction: column; align-items: stretch; gap: 0.3rem; }
  .nav-gears a {
    justify-content: flex-start;
    min-height: 52px;
    padding: 0.85rem 1rem;
    font-size: 1.2rem;
    letter-spacing: 0.12em;
    background: rgba(20, 27, 38, 0.55);
    border-color: rgba(199, 205, 212, 0.1);
  }
  .nav-gears a::after { left: 1rem; right: 1rem; }
  .nav-shortcuts {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    margin-top: 1.5rem;
    padding-top: 1.35rem;
    border-top: 1px solid var(--line);
  }
  .nav-shortcuts .utility-link,
  .nav-shortcuts .btn { width: 100%; justify-content: center; }

  .split-shell { grid-template-columns: minmax(0, 1fr); }
  .rail-sticky { position: static; }
}

@media (max-width: 980px) {
  .footer-top { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 680px) {
  .brand-name { font-size: 1.05rem; }
  .brand-tagline { display: none; }
  .brand-mark { width: 32px; height: 32px; }
  .brand-mark span { height: 16px; }
  .brand-mark span:first-child { left: 10px; }
  .brand-mark span:last-child { right: 10px; height: 12px; }
  .countdown__value { font-size: 0.92rem; }
  .countdown__label { font-size: 0.62rem; }
  .nav-toggle__text { display: none; }
  .footer-legal { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 560px) {
  .footer-top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ---------- 17. 动效降级 ---------- */
@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;
  }
  html.has-js [data-reveal] { opacity: 1; transform: none; }
  .scroll-progress { transition: none; }
}