/* =========================================================
   竞博看台 · 共享样式表 /assets/site.css
   夜场看台 × 数据实验室
   ========================================================= */

/* ---------- 1. 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, li, figure, figcaption,
blockquote, dl, dd, table, th, td, fieldset, legend {
  margin: 0;
}

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

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

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

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

table { border-collapse: collapse; width: 100%; }

[hidden] { display: none !important; }

/* ---------- 2. 变量 ---------- */
:root {
  --m-void: #07101F;
  --m-panel: #0D1B2E;
  --m-indigo: #2A1B4A;
  --m-teal: #0B3A3A;
  --m-wine: #4A1220;
  --m-orange: #FF6B2C;
  --m-cyan: #39D9D0;
  --m-silver: #C9D1DC;
  --m-mist: #F2F5F8;
  --m-aubergine: #3B235C;

  --line: rgba(201, 209, 220, 0.14);
  --line-strong: rgba(201, 209, 220, 0.28);
  --line-cyan: rgba(57, 217, 208, 0.28);
  --surface: rgba(242, 245, 248, 0.045);

  --font-head: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui,
    -apple-system, "Segoe UI", Roboto, "Noto Sans SC", sans-serif;
  --font-body: var(--font-head);
  --font-data: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 26px;
  --radius-pill: 999px;

  --wrap: 1240px;
  --gutter: clamp(1.1rem, 4vw, 2.5rem);
  --gap: clamp(1rem, 2vw, 1.6rem);

  --dur: 0.22s;
  --ease: cubic-bezier(0.22, 0.7, 0.3, 1);

  --shadow-lift: 0 24px 54px -34px rgba(0, 0, 0, 0.95);
  --shadow-orange: 0 12px 28px -16px rgba(255, 107, 44, 0.95);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background: var(--m-void);
  color: var(--m-mist);
  font-family: var(--font-body);
  font-size: clamp(1rem, 0.96rem + 0.18vw, 1.12rem);
  line-height: 1.75;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.015em;
  text-wrap: balance;
}

h1 { font-size: clamp(2.2rem, 5vw, 5.25rem); }
h2 { font-size: clamp(1.5rem, 2.6vw, 2.6rem); }
h3 { font-size: clamp(1.15rem, 1.6vw, 1.45rem); font-weight: 800; }

p { text-wrap: pretty; }

::selection {
  background: var(--m-cyan);
  color: var(--m-void);
}

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

/* ---------- 4. 工具类 ---------- */
.wrap {
  width: min(var(--wrap), 100% - (var(--gutter) * 2));
  margin-inline: auto;
}

.wrap--narrow {
  width: min(860px, 100% - (var(--gutter) * 2));
  margin-inline: auto;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.is-skew { transform: skewX(-2.4deg); }

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -4rem;
  z-index: 140;
  padding: 0.6rem 1.1rem;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background: var(--m-cyan);
  color: var(--m-void);
  font-weight: 800;
  font-size: 0.9rem;
  transition: top var(--dur) var(--ease);
}

.skip-link:focus {
  top: 0;
}

/* ---------- 6. 头部与命令栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  z-index: 130;
  background: linear-gradient(90deg, var(--m-cyan), var(--m-orange));
  pointer-events: none;
}

.command-bar {
  position: relative;
  background: linear-gradient(180deg, rgba(7, 16, 31, 0.97), rgba(13, 27, 46, 0.93));
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-cyan);
}

.command-bar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 4px;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(57, 217, 208, 0.5) 0 1px,
    transparent 1px 14px
  );
  opacity: 0.45;
  pointer-events: none;
}

.command-bar__inner {
  width: min(var(--wrap), 100% - (var(--gutter) * 2));
  margin-inline: auto;
  min-height: 68px;
  display: flex;
  align-items: center;
  gap: clamp(0.6rem, 1.6vw, 1.4rem);
}

.command-bar__actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex: 0 0 auto;
  margin-left: auto;
}

/* 品牌索引 */
.cmd-brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex: 0 0 auto;
}

.cmd-brand__mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--m-orange), #FF9B5E);
  color: var(--m-void);
  font-family: var(--font-data);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  transform: skewX(-8deg);
  box-shadow: var(--shadow-orange);
}

.cmd-brand__copy {
  display: flex;
  flex-direction: column;
  line-height: 1.16;
}

.cmd-brand__name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.04rem;
  letter-spacing: 0.02em;
  transform: skewX(-2.4deg);
}

.cmd-brand__line {
  font-family: var(--font-data);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--m-silver);
  white-space: nowrap;
}

/* 主导航 */
.cmd-nav {
  display: flex;
  align-items: center;
  gap: 0.05rem;
  margin-inline: auto;
}

.cmd-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.34rem;
  padding: 0.5rem 0.62rem;
  border-radius: var(--radius-sm);
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--m-silver);
  white-space: nowrap;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.cmd-nav__link:hover {
  background: var(--m-aubergine);
  color: var(--m-mist);
}

.cmd-nav__index {
  font-family: var(--font-data);
  font-size: 0.66rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: rgba(201, 209, 220, 0.6);
}

.cmd-nav__link[aria-current="page"] {
  background: rgba(57, 217, 208, 0.12);
  color: var(--m-mist);
}

.cmd-nav__link[aria-current="page"] .cmd-nav__index {
  color: var(--m-cyan);
}

.cmd-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0.62rem;
  right: 0.62rem;
  bottom: 0.16rem;
  height: 2px;
  background: var(--m-cyan);
  transform: skewX(-24deg);
}

/* 当前状态提示 */
.cmd-status {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  max-width: 12rem;
  padding: 0.32rem 0.66rem;
  border-radius: var(--radius-pill);
  background: rgba(7, 16, 31, 0.6);
  border: 1px solid var(--line-cyan);
  font-family: var(--font-data);
  font-size: 0.72rem;
  color: var(--m-silver);
}

.cmd-status__dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--m-cyan);
  box-shadow: 0 0 0 3px rgba(57, 217, 208, 0.16);
}

.cmd-status__text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--m-mist);
}

/* 移动导航按钮 */
.cmd-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 40px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong);
  background: rgba(13, 27, 46, 0.6);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.cmd-toggle:hover { border-color: var(--m-cyan); }

.cmd-toggle[aria-expanded="true"] {
  border-color: var(--m-cyan);
  background: rgba(57, 217, 208, 0.14);
}

.cmd-toggle__box {
  display: block;
  position: relative;
  width: 20px;
  height: 14px;
}

.cmd-toggle__box span {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--m-mist);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.cmd-toggle__box span:nth-child(1) { top: 0; }
.cmd-toggle__box span:nth-child(2) { top: 6px; }
.cmd-toggle__box span:nth-child(3) { top: 12px; }

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

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.62rem 1.05rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: 0.02em;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease),
    color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.btn--primary {
  background: var(--m-orange);
  color: var(--m-void);
  box-shadow: var(--shadow-orange);
}

.btn--primary:hover {
  background: #FF8350;
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line-strong);
  color: var(--m-mist);
}

.btn--ghost:hover {
  border-color: var(--m-cyan);
  color: var(--m-cyan);
}

.btn--subtle {
  background: rgba(57, 217, 208, 0.12);
  border-color: var(--line-cyan);
  color: var(--m-cyan);
}

.btn--subtle:hover {
  background: rgba(57, 217, 208, 0.2);
}

.btn--sm {
  padding: 0.42rem 0.78rem;
  font-size: 0.8rem;
}

/* ---------- 8. 章节与容器 ---------- */
.section {
  padding-block: clamp(2.6rem, 6vw, 5rem);
}

.section--tight {
  padding-block: clamp(1.8rem, 4vw, 3rem);
}

.section__head {
  display: grid;
  gap: 0.7rem;
  max-width: 62ch;
  margin-bottom: clamp(1.4rem, 3vw, 2.2rem);
}

.section__title {
  font-size: clamp(1.5rem, 2.6vw, 2.6rem);
}

.section__lede {
  color: var(--m-silver);
  font-size: 1.02rem;
  max-width: 64ch;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--m-cyan);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--m-cyan);
  transform: skewX(-30deg);
}

/* ---------- 9. 网格 ---------- */
.stack {
  display: grid;
  gap: var(--gap);
}

.grid {
  display: grid;
  gap: var(--gap);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.85fr); }

@media (max-width: 1000px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

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

@media (max-width: 620px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 10. 面板 ---------- */
.panel {
  position: relative;
  isolation: isolate;
  padding: clamp(1.25rem, 3vw, 2.2rem);
  border-radius: var(--radius-lg);
  background: var(--m-panel);
  box-shadow: var(--shadow-lift);
}

.panel::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid rgba(242, 245, 248, 0.06);
  pointer-events: none;
}

.panel--indigo { background: linear-gradient(160deg, #2A1B4A 0%, #150E2A 100%); }
.panel--teal { background: linear-gradient(160deg, #0B3A3A 0%, #06201F 100%); }
.panel--wine { background: linear-gradient(160deg, #4A1220 0%, #210A10 100%); }
.panel--mist { background: var(--surface); }

.panel__title {
  font-size: clamp(1.15rem, 1.8vw, 1.5rem);
  margin-bottom: 0.5rem;
}

.panel__meta {
  font-family: var(--font-data);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--m-silver);
}

.tick-rule {
  height: 12px;
  border-top: 1px solid var(--line-cyan);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(57, 217, 208, 0.5) 0 1px,
    transparent 1px 13px
  );
  background-repeat: no-repeat;
  background-size: 100% 6px;
  background-position: left top;
}

/* ---------- 11. 媒体容器（供页面阶段放置图片） ---------- */
.media-frame {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-radius: var(--radius-md);
  background: var(--m-panel);
}

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

.media-frame__placeholder {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 12% 0%, rgba(57, 217, 208, 0.26), transparent 58%),
    radial-gradient(110% 85% at 92% 100%, rgba(255, 107, 44, 0.26), transparent 60%),
    linear-gradient(150deg, #0D1B2E 0%, #2A1B4A 58%, #07101F 100%);
}

.media-frame__placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(242, 245, 248, 0.08) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(0deg, rgba(242, 245, 248, 0.08) 0 1px, transparent 1px 46px);
  -webkit-mask-image: linear-gradient(155deg, #000 8%, transparent 76%);
  mask-image: linear-gradient(155deg, #000 8%, transparent 76%);
}

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 1.4rem 1rem 0.8rem;
  background: linear-gradient(180deg, transparent, rgba(7, 16, 31, 0.92));
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: var(--m-silver);
}

.ratio-16x9 { aspect-ratio: 16 / 9; }
.ratio-4x3 { aspect-ratio: 4 / 3; }
.ratio-3x4 { aspect-ratio: 3 / 4; }
.ratio-1x1 { aspect-ratio: 1 / 1; }
.ratio-21x9 { aspect-ratio: 21 / 9; }

/* ---------- 12. 数据表 ---------- */
.data-scroll {
  overflow-x: auto;
  border-radius: var(--radius-md);
  scrollbar-color: var(--m-cyan) rgba(13, 27, 46, 0.8);
}

.data-table {
  width: 100%;
  min-width: 520px;
  font-family: var(--font-data);
  font-size: 0.86rem;
}

.data-table th {
  padding: 0.6rem 0.7rem;
  text-align: left;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--m-silver);
  border-bottom: 1px solid var(--line-cyan);
}

.data-table td {
  padding: 0.62rem 0.7rem;
  color: var(--m-mist);
  border-bottom: 1px solid var(--line);
}

.data-table tbody tr:hover {
  background: rgba(57, 217, 208, 0.06);
}

/* ---------- 13. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.22rem 0.62rem;
  border-radius: var(--radius-pill);
  background: rgba(59, 35, 92, 0.8);
  border: 1px solid rgba(201, 209, 220, 0.18);
  color: var(--m-mist);
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  line-height: 1.7;
  white-space: nowrap;
}

.tag--cyan {
  background: rgba(57, 217, 208, 0.14);
  border-color: var(--line-cyan);
  color: var(--m-cyan);
}

.tag--orange {
  background: rgba(255, 107, 44, 0.16);
  border-color: rgba(255, 107, 44, 0.4);
  color: #FFB08A;
}

/* ---------- 14. 长文 ---------- */
.prose {
  display: grid;
  gap: 1.05em;
  max-width: 70ch;
  color: rgba(242, 245, 248, 0.86);
}

.prose h2 {
  font-size: clamp(1.3rem, 2vw, 1.85rem);
  color: var(--m-mist);
  margin-top: 0.4em;
}

.prose h3 {
  font-size: clamp(1.08rem, 1.5vw, 1.3rem);
  color: var(--m-mist);
  margin-top: 0.3em;
}

.prose ul,
.prose ol {
  display: grid;
  gap: 0.42rem;
  padding-left: 1.25rem;
  list-style: disc;
}

.prose ol { list-style: decimal; }

.prose li::marker { color: var(--m-cyan); }

.prose a {
  color: var(--m-cyan);
  border-bottom: 1px solid var(--line-cyan);
}

.prose strong {
  color: var(--m-mist);
  font-weight: 800;
}

.prose blockquote {
  padding-left: 1rem;
  border-left: 3px solid var(--m-orange);
  color: var(--m-silver);
}

.prose code {
  font-family: var(--font-data);
  font-size: 0.9em;
  padding: 0.1rem 0.35rem;
  border-radius: 5px;
  background: rgba(59, 35, 92, 0.6);
  color: var(--m-cyan);
}

/* ---------- 15. 面包屑 ---------- */
.breadcrumb {
  padding-block: clamp(0.9rem, 2vw, 1.4rem);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-data);
  font-size: 0.76rem;
  color: var(--m-silver);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: rgba(201, 209, 220, 0.4);
}

.breadcrumb__link { color: var(--m-silver); }
.breadcrumb__link:hover { color: var(--m-cyan); }

.breadcrumb__current {
  color: var(--m-cyan);
  font-weight: 600;
}

/* ---------- 16. 筛选与显现 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  width: fit-content;
  max-width: 100%;
  padding: 0.45rem;
  border-radius: var(--radius-pill);
  background: rgba(13, 27, 46, 0.78);
  border: 1px solid var(--line);
}

.filter-btn {
  padding: 0.42rem 0.95rem;
  border-radius: var(--radius-pill);
  font-size: 0.84rem;
  font-weight: 700;
  color: var(--m-silver);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.filter-btn:hover {
  background: rgba(59, 35, 92, 0.7);
  color: var(--m-mist);
}

.filter-btn[aria-pressed="true"] {
  background: var(--m-cyan);
  color: var(--m-void);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease);
}

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

/* ---------- 17. 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: 90;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  border: 1px solid var(--line-cyan);
  background: rgba(13, 27, 46, 0.94);
  color: var(--m-cyan);
  font-family: var(--font-data);
  font-size: 1.1rem;
  line-height: 1;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease),
    visibility var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.to-top:hover { border-color: var(--m-orange); color: var(--m-orange); }

/* ---------- 18. 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  margin-top: clamp(3rem, 7vw, 6rem);
  padding-block: clamp(2.6rem, 5vw, 4.2rem) 1.6rem;
  background: linear-gradient(180deg, #07101F 0%, #0A1526 52%, #0D1B2E 100%);
  border-top: 1px solid var(--line-cyan);
  color: var(--m-silver);
}

.site-footer__glow {
  position: absolute;
  inset: -30% -10% auto -10%;
  height: 340px;
  pointer-events: none;
  background:
    radial-gradient(58% 100% at 16% 0%, rgba(255, 107, 44, 0.18), transparent 70%),
    radial-gradient(52% 100% at 84% 0%, rgba(57, 217, 208, 0.16), transparent 72%);
}

.site-footer .wrap {
  position: relative;
  z-index: 1;
}

.footer-lede {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.4rem;
  padding-bottom: clamp(1.6rem, 3vw, 2.4rem);
  border-bottom: 1px solid var(--line);
}

.footer-lede__text {
  max-width: 52ch;
  font-size: 0.96rem;
  color: var(--m-silver);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.5rem;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.3rem;
  letter-spacing: 0.02em;
  color: var(--m-mist);
}

.footer-brand__mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--m-cyan), #1C8F8A);
  color: #04191A;
  font-size: 0.9rem;
  font-weight: 900;
  transform: skewX(-8deg);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(1.4rem, 3vw, 2.4rem);
  padding-block: clamp(1.8rem, 4vw, 2.8rem);
}

.footer-col__title {
  margin-bottom: 0.9rem;
  font-family: var(--font-data);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--m-cyan);
}

.footer-col__list {
  display: grid;
  gap: 0.55rem;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  color: var(--m-silver);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.footer-link::before {
  content: "";
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  border-radius: 2px;
  background: rgba(57, 217, 208, 0.5);
  transform: skewX(-16deg);
  transition: background var(--dur) var(--ease);
}

.footer-link:hover {
  color: var(--m-mist);
  transform: translateX(3px);
}

.footer-link:hover::before { background: var(--m-orange); }

.footer-contact {
  display: grid;
  gap: 0.75rem;
}

.footer-contact__item {
  display: grid;
  gap: 0.12rem;
}

.footer-contact__key {
  font-family: var(--font-data);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(201, 209, 220, 0.68);
}

.footer-contact__val {
  font-size: 0.95rem;
  color: var(--m-mist);
  word-break: break-word;
}

.footer-note {
  margin-top: 0.9rem;
  max-width: 34ch;
  font-size: 0.82rem;
  line-height: 1.7;
  color: rgba(201, 209, 220, 0.72);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1.4rem;
  padding-top: clamp(1.2rem, 3vw, 1.8rem);
  border-top: 1px solid var(--line);
  font-family: var(--font-data);
  font-size: 0.76rem;
  letter-spacing: 0.04em;
  color: rgba(201, 209, 220, 0.72);
}

@media (max-width: 1000px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

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

/* ---------- 19. 响应式：头部 ---------- */
@media (max-width: 1200px) {
  .cmd-nav__link { padding: 0.5rem 0.5rem; font-size: 0.82rem; }
  .cmd-nav__index { display: none; }
}

@media (max-width: 1080px) {
  .cmd-toggle { display: inline-flex; }

  .cmd-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    margin-inline: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.4rem var(--gutter) 1rem;
    background: linear-gradient(180deg, rgba(13, 27, 46, 0.99), rgba(7, 16, 31, 0.99));
    border-bottom: 1px solid var(--line-cyan);
    box-shadow: var(--shadow-lift);
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    opacity: 0;
    transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease),
      visibility var(--dur) var(--ease);
  }

  .cmd-nav[data-open] {
    max-height: min(72vh, 520px);
    overflow-y: auto;
    visibility: visible;
    opacity: 1;
  }

  .cmd-nav__link {
    padding: 0.85rem 0.2rem;
    font-size: 1rem;
    border-radius: 0;
    border-bottom: 1px solid var(--line);
  }

  .cmd-nav__index { display: inline; }

  .cmd-nav__link[aria-current="page"] { background: transparent; }

  .cmd-nav__link[aria-current="page"]::after {
    left: 0.2rem;
    right: auto;
    bottom: 0.45rem;
    width: 56px;
  }
}

@media (max-width: 900px) {
  .cmd-status { display: none; }
}

@media (max-width: 720px) {
  .command-bar__inner { min-height: 62px; }
  .cmd-brand__line { display: none; }
}

@media (max-width: 560px) {
  .cmd-cta { display: none; }
}

/* ---------- 20. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

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

  .scroll-progress { transition: none; }
}