/* ============================================================
   /assets/site.css — 共享外壳与基础组件
   夜间数据驾驶舱 · 墨蓝 / 荧光青 / 熔岩橙
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 150px;
}

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

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

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

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

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

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

/* ---------- Tokens ---------- */
:root {
  --ink-900: #0B1B2B;
  --ink-850: #08131F;
  --ink-800: #0F2A3D;
  --ink-700: #1B3A52;

  --cyan: #00E5FF;
  --cyan-soft: rgba(0, 229, 255, 0.12);
  --lava: #FF6A00;
  --lava-soft: rgba(255, 106, 0, 0.12);

  --paper: #F5F7FA;
  --grey: #68808F;
  --line: #C7D2DC;
  --white: #FFFFFF;

  --text: rgba(255, 255, 255, 0.82);
  --text-dim: rgba(255, 255, 255, 0.64);
  --border-dark: rgba(199, 210, 220, 0.16);
  --border-cyan: rgba(0, 229, 255, 0.4);

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Menlo", "Consolas", "Liberation Mono", monospace;

  --shell: 1200px;
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --dur: 180ms;
}

/* ---------- Base ---------- */
body {
  min-height: 100vh;
  overflow-x: hidden;
  background-color: var(--ink-900);
  background-image:
    linear-gradient(180deg, rgba(0, 229, 255, 0.055) 0, rgba(0, 229, 255, 0) 360px),
    repeating-linear-gradient(90deg, rgba(199, 210, 220, 0.045) 0 1px, transparent 1px 88px);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body.nav-locked { overflow: hidden; }

h1, h2, h3, h4 { color: var(--white); font-weight: 800; letter-spacing: -0.02em; line-height: 1.2; }

p { text-wrap: pretty; }

::selection { background: var(--cyan); color: #04121C; }

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

/* 工具类 */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 40px);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

/* ---------- Skip link ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--cyan);
  color: #04121C;
  font-size: 14px;
  font-weight: 700;
  border-radius: 2px;
  transform: translateY(-180%);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--white);
  outline-offset: 2px;
}

/* ---------- 滚动进度（JS 注入） ---------- */
.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  z-index: 120;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan) 0%, #7BF6FF 58%, var(--lava) 100%);
  pointer-events: none;
  will-change: transform;
}

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--ink-900);
  border-bottom: 1px solid var(--border-dark);
  transition: box-shadow var(--dur) var(--ease);
}

.site-header.is-scrolled {
  box-shadow: 0 16px 34px rgba(3, 10, 18, 0.55);
}

/* 上层状态带 */
.header-meta {
  background: var(--ink-800);
  border-bottom: 1px solid rgba(0, 229, 255, 0.14);
  color: var(--grey);
  font-size: 12px;
}

.header-meta__inner {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px clamp(12px, 3vw, 30px);
  min-height: 36px;
  padding-block: 5px;
}

.header-meta__brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.88);
  font-weight: 600;
  letter-spacing: 0.01em;
}

.header-meta__brand .mono {
  color: var(--cyan);
  font-weight: 700;
  letter-spacing: 0.08em;
}

.meta-dot {
  width: 6px;
  height: 6px;
  flex: 0 0 auto;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(0, 229, 255, 0.16);
}

.header-meta__desc {
  position: relative;
  padding-left: 15px;
  color: rgba(255, 255, 255, 0.58);
}

.header-meta__desc::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 1px;
  height: 12px;
  margin-top: -6px;
  background: rgba(199, 210, 220, 0.32);
}

.header-meta__note {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  color: var(--grey);
}

.header-meta__note .mono {
  color: var(--lava);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

/* 主行 */
.header-bar__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 26px);
  min-height: 74px;
  padding-block: 11px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: 0 0 auto;
  background: linear-gradient(145deg, var(--ink-700), var(--ink-800));
  border: 1px solid var(--border-cyan);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.brand:hover .brand__mark,
.brand:focus-visible .brand__mark {
  border-color: var(--cyan);
  box-shadow: 0 0 0 1px rgba(0, 229, 255, 0.22), 0 0 22px rgba(0, 229, 255, 0.2);
}

.brand__text { display: flex; flex-direction: column; }

.brand__name {
  display: block;
  color: var(--white);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.brand__sub {
  display: block;
  margin-top: 3px;
  color: var(--grey);
  font-size: 10px;
  letter-spacing: 0.18em;
  line-height: 1.2;
}

/* 移动开关 */
.nav-toggle {
  display: none;
  margin-left: auto;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: rgba(0, 229, 255, 0.06);
  border: 1px solid var(--border-cyan);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.nav-toggle:hover {
  background: rgba(0, 229, 255, 0.13);
  box-shadow: 0 0 18px rgba(0, 229, 255, 0.15);
}

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

.nav-toggle__bars span {
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform 160ms var(--ease);
}

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

.site-header[data-open] .nav-toggle__bars span:nth-child(1) {
  transform: translateY(3px) rotate(45deg);
}

.site-header[data-open] .nav-toggle__bars span:nth-child(2) {
  transform: translateY(-3px) rotate(-45deg);
}

/* 导航 */
.nav-wrap {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.nav-panel__head { display: none; }

.nav-panel__head-title {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.nav-close {
  padding: 6px 12px;
  border: 1px solid rgba(199, 210, 220, 0.32);
  color: rgba(255, 255, 255, 0.82);
  font-size: 12px;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.nav-close:hover { border-color: var(--cyan); color: var(--cyan); }

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-item { display: contents; }

.nav-link {
  position: relative;
  display: inline-block;
  padding: 9px 13px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 15px;
  line-height: 1.4;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 4px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}

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

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

.nav-link[aria-current="page"] {
  color: var(--cyan);
  background: rgba(0, 229, 255, 0.07);
}

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

.nav-cta { margin-left: 10px; }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 104px);
  padding-block: clamp(34px, 5vw, 60px) 22px;
  background: linear-gradient(180deg, var(--ink-900) 0%, var(--ink-850) 60%, #050D16 100%);
  border-top: 1px solid rgba(0, 229, 255, 0.2);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: repeating-linear-gradient(90deg, var(--cyan) 0 26px, transparent 26px 56px);
  opacity: 0.45;
  pointer-events: none;
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 22px;
  padding-bottom: clamp(22px, 3.6vw, 38px);
  border-bottom: 1px solid var(--border-dark);
}

.footer-code {
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  text-transform: uppercase;
}

.footer-line {
  margin-top: 10px;
  color: var(--white);
  font-size: clamp(21px, 3.1vw, 33px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.28;
  max-width: 22ch;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.3fr 0.8fr;
  gap: clamp(20px, 3.6vw, 44px);
  padding-block: clamp(26px, 4vw, 44px);
}

.footer-col { min-width: 0; }

.footer-col__title {
  margin-bottom: 14px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(0, 229, 255, 0.18);
  color: var(--cyan);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  font-weight: 400;
}

.footer-about {
  color: rgba(255, 255, 255, 0.76);
  font-size: 14.5px;
  line-height: 1.85;
  max-width: 32ch;
}

.footer-note {
  margin-top: 14px;
  color: var(--grey);
  font-size: 12.5px;
  line-height: 1.75;
  max-width: 32ch;
}

.footer-links {
  display: grid;
  gap: 9px;
}

.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 14.5px;
  line-height: 1.5;
  transition: color var(--dur) var(--ease), gap var(--dur) var(--ease);
}

.footer-link::before {
  content: "";
  width: 6px;
  height: 1px;
  flex: 0 0 auto;
  background: var(--cyan);
  opacity: 0.55;
  transition: width var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

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

.footer-link:hover::before,
.footer-link:focus-visible::before { width: 16px; opacity: 1; }

.footer-contact { display: grid; gap: 12px; }

.footer-contact__item { display: block; }

.footer-contact__label {
  display: block;
  margin-bottom: 2px;
  color: var(--grey);
  font-size: 10.5px;
  letter-spacing: 0.16em;
}

.footer-contact__value {
  display: block;
  color: rgba(255, 255, 255, 0.88);
  font-size: 14px;
  line-height: 1.6;
  overflow-wrap: anywhere;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 22px;
  padding-top: 18px;
  border-top: 1px solid rgba(199, 210, 220, 0.12);
  color: var(--grey);
  font-size: 12px;
}

.footer-legal__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
}

.footer-copy { font-size: 12px; line-height: 1.6; }

/* ============================================================
   通用按钮
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 1px solid transparent;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.1;
  cursor: pointer;
  transition:
    background-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.btn--accent {
  background: var(--lava);
  border-color: #FF8A3D;
  color: #240C00;
  clip-path: polygon(0 0, 100% 0, 100% 64%, calc(100% - 13px) 100%, 0 100%);
}

.btn--accent:hover,
.btn--accent:focus-visible {
  background: #FF7F1F;
  box-shadow: 0 10px 26px rgba(255, 106, 0, 0.32);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  border-color: var(--border-cyan);
  color: var(--cyan);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: var(--cyan-soft);
  border-color: var(--cyan);
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.18);
}

/* ============================================================
   页面阶段基础组件
   ============================================================ */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: currentColor;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid rgba(199, 210, 220, 0.35);
  background: rgba(255, 255, 255, 0.03);
  color: rgba(255, 255, 255, 0.78);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  line-height: 1.5;
}

.tag--cyan {
  border-color: rgba(0, 229, 255, 0.45);
  background: var(--cyan-soft);
  color: var(--cyan);
}

.tag--accent {
  border-color: rgba(255, 106, 0, 0.5);
  background: var(--lava-soft);
  color: #FF9147;
}

.tag--paper {
  border-color: var(--line);
  background: var(--white);
  color: #1F3340;
}

.breadcrumb {
  color: var(--grey);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

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

.breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumb li:not(:last-child)::after {
  content: "/";
  color: rgba(104, 128, 143, 0.65);
}

.breadcrumb a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: underline;
  text-decoration-color: rgba(0, 229, 255, 0.35);
  text-underline-offset: 3px;
  transition: color var(--dur) var(--ease), text-decoration-color var(--dur) var(--ease);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible {
  color: var(--cyan);
  text-decoration-color: var(--cyan);
}

.breadcrumb [aria-current="page"] { color: var(--cyan); }

.page-head {
  padding-block: clamp(30px, 5vw, 62px) clamp(22px, 3.6vw, 38px);
  border-bottom: 1px solid var(--border-dark);
}

.page-head__title {
  font-size: clamp(28px, 5vw, 52px);
  line-height: 1.12;
  color: var(--white);
}

.page-head__lead {
  margin-top: 14px;
  max-width: 62ch;
  color: var(--text-dim);
  font-size: 16px;
  line-height: 1.85;
}

.section { padding-block: clamp(34px, 5.5vw, 78px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px 24px;
  padding-bottom: 16px;
  margin-bottom: clamp(20px, 3vw, 32px);
  border-bottom: 1px solid var(--border-dark);
}

.section-title {
  font-size: clamp(23px, 3.2vw, 34px);
  line-height: 1.22;
  color: var(--white);
}

.section-lead {
  max-width: 54ch;
  color: var(--text-dim);
  font-size: 15px;
  line-height: 1.85;
}

.panel {
  position: relative;
  padding: clamp(18px, 2.6vw, 28px);
  background: linear-gradient(160deg, rgba(27, 58, 82, 0.9), rgba(15, 42, 61, 0.94));
  border: 1px solid var(--border-dark);
}

.panel--cut {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.panel--accent {
  border-color: rgba(0, 229, 255, 0.35);
  box-shadow: inset 0 0 0 1px rgba(0, 229, 255, 0.08);
}

.surface-paper {
  background: var(--paper);
  border: 1px solid var(--line);
  color: #22323F;
  box-shadow: 0 18px 40px rgba(3, 10, 18, 0.28);
}

.prose {
  max-width: 720px;
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: 0.004em;
}

.prose > * + * { margin-top: 1.1em; }

.prose h2 {
  margin-top: 1.8em;
  font-family: var(--font-sans);
  font-size: clamp(21px, 2.5vw, 27px);
  line-height: 1.35;
  color: inherit;
}

.prose h3 {
  margin-top: 1.5em;
  font-family: var(--font-sans);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.45;
  color: inherit;
}

.prose a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(0, 229, 255, 0.55);
  transition: text-decoration-color var(--dur) var(--ease);
}

.prose a:hover { text-decoration-color: currentColor; }

.prose ul {
  display: grid;
  gap: 0.5em;
}

.prose ul li {
  position: relative;
  padding-left: 1.1em;
}

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  background: var(--cyan);
}

.surface-paper .prose { color: #22323F; }

.surface-paper .prose ul li::before { background: var(--lava); }

.surface-paper .prose a { text-decoration-color: rgba(255, 106, 0, 0.6); }

.grid {
  display: grid;
  gap: clamp(16px, 2.6vw, 28px);
}

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

.grid--3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

/* 响应式图片容器基础规则 */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(199, 210, 220, 0.18);
  background: linear-gradient(150deg, var(--ink-700), var(--ink-900));
}

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

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(0, 229, 255, 0.16) 0 1px, transparent 1px 44px);
  mix-blend-mode: screen;
  pointer-events: none;
}

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

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

.media-frame__label {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 6px 10px;
  background: rgba(11, 27, 43, 0.84);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1240px) and (min-width: 1041px) {
  .nav-link { padding: 9px 10px; font-size: 14px; }
  .nav-link::after { left: 10px; right: 10px; }
  .nav-cta { margin-left: 6px; padding: 11px 16px; }
}

@media (max-width: 1040px) {
  html { scroll-padding-top: 118px; }

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

  .nav-wrap {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 70;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    max-height: 86vh;
    overflow-y: auto;
    padding: 16px clamp(16px, 5vw, 30px) calc(20px + env(safe-area-inset-bottom));
    background: linear-gradient(180deg, var(--ink-800) 0%, #08131F 100%);
    border-top: 2px solid var(--cyan);
    box-shadow: 0 -26px 60px rgba(0, 0, 0, 0.6);
    transform: translateY(101%);
    visibility: hidden;
    transition: transform 220ms var(--ease), visibility 220ms var(--ease);
  }

  .site-header[data-open] .nav-wrap {
    transform: translateY(0);
    visibility: visible;
  }

  .nav-panel__head {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding-bottom: 12px;
    margin-bottom: 4px;
    border-bottom: 1px solid rgba(0, 229, 255, 0.2);
  }

  .nav-list {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .nav-link {
    display: block;
    padding: 14px;
    background: rgba(255, 255, 255, 0.025);
    border: 1px solid rgba(199, 210, 220, 0.14);
    font-size: 15px;
  }

  .nav-link::after {
    left: 14px;
    right: auto;
    bottom: 8px;
    width: 18px;
  }

  .nav-link[aria-current="page"] {
    background: rgba(0, 229, 255, 0.1);
    border-color: rgba(0, 229, 255, 0.45);
  }

  .nav-cta {
    grid-column: 1 / -1;
    margin: 6px 0 0;
    padding: 15px;
    font-size: 15px;
  }

  .header-meta__desc { display: none; }

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

@media (max-width: 720px) {
  .header-meta { font-size: 11.5px; }

  .header-meta__note { font-size: 11px; }

  .header-bar__inner { min-height: 66px; padding-block: 10px; }

  .brand__mark { width: 38px; height: 38px; font-size: 13px; }

  .brand__name { font-size: 17px; }

  .brand__sub { font-size: 9px; letter-spacing: 0.14em; }

  .footer-line { max-width: none; }

  .footer-top { align-items: flex-start; }
}

@media (max-width: 600px) {
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }

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

  .nav-list { grid-template-columns: 1fr; }

  .prose { font-size: 16.5px; }
}

/* ============================================================
   可访问性
   ============================================================ */
@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;
    scroll-behavior: auto !important;
  }
}