/* ============================================================
   电竞世界主站 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 刊头 / 页脚 / 基础组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 136px;
}

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

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

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

button, input, select, textarea { font: inherit; color: inherit; }

a { color: inherit; }

::selection { background: #FF2E9A; color: #0A0710; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-void: #070B12;
  --ink-carbon: #121826;
  --ink-slate: #0C1220;
  --neon-cyan: #21F3FF;
  --neon-magenta: #FF2E9A;
  --volt-purple: #8B5CFF;
  --volt-lime: #B6FF3B;
  --ice: #EAF6FF;
  --steel: #8FA3B8;
  --paper: #F4F1E8;
  --alert: #FF5C5C;

  --edge: rgba(33, 243, 255, 0.22);
  --edge-soft: rgba(143, 163, 184, 0.2);
  --edge-hard: rgba(33, 243, 255, 0.55);
  --hair: rgba(143, 163, 184, 0.16);

  --font-display: "PingFang SC Semibold", "Source Han Sans SC", "Noto Sans SC",
    "Microsoft YaHei", Impact, "Arial Narrow", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui,
    -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular,
    Menlo, Consolas, monospace;

  --gutter: clamp(16px, 4vw, 56px);
  --shell: min(1440px, 100% - var(--gutter) * 2);
  --slice: 12px;

  --ease-out: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 0.28s;

  --z-header: 90;
  --z-dock: 95;
  --z-skip: 200;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100%;
  background-color: var(--ink-void);
  background-image:
    radial-gradient(880px 520px at 92% -6%, rgba(255, 46, 154, 0.15), transparent 62%),
    radial-gradient(760px 520px at 4% 2%, rgba(33, 243, 255, 0.13), transparent 60%),
    radial-gradient(700px 620px at 50% 108%, rgba(139, 92, 255, 0.13), transparent 66%);
  background-repeat: no-repeat;
  color: var(--ice);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  overflow-x: clip;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 0.94;
  letter-spacing: -0.02em;
  color: var(--ice);
}

h1 { font-size: clamp(2.4rem, 6vw, 5rem); }
h2 { font-size: clamp(1.9rem, 4vw, 3.2rem); }
h3 { font-size: clamp(1.3rem, 2.2vw, 1.9rem); }

p { max-width: 68ch; }

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

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

#main-content { display: block; scroll-margin-top: 132px; }

/* ---------- 4. 容器与布局工具 ---------- */
.wrap {
  width: var(--shell);
  margin-inline: auto;
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 28px);
}

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

.band {
  position: relative;
  padding-block: clamp(40px, 7vw, 96px);
}

.band--carbon {
  background: linear-gradient(180deg, var(--ink-carbon), var(--ink-slate));
  border-block: 1px solid var(--hair);
}

.band--edge {
  border-block: 1px solid var(--edge-soft);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.6rem 1.2rem;
  margin-bottom: clamp(18px, 2.4vw, 34px);
}

.section-head__index {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--neon-cyan);
}

.section-head__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 3.4vw, 2.6rem);
  line-height: 1;
  letter-spacing: -0.02em;
}

/* ---------- 5. 文本原子组件 ---------- */
.index {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.6;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--steel);
  font-variant-numeric: tabular-nums;
}

.display {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.8rem, 9vw, 7.5rem);
  line-height: 0.88;
  letter-spacing: -0.035em;
  text-transform: none;
}

.display--chroma {
  text-shadow:
    0.05em 0.05em 0 rgba(255, 46, 154, 0.6),
    -0.035em -0.035em 0 rgba(33, 243, 255, 0.42);
}

.display--outline {
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(234, 246, 255, 0.5);
  text-stroke: 1.5px rgba(234, 246, 255, 0.5);
}

/* ---------- 6. 正文区块 ---------- */
.prose {
  max-width: 68ch;
  color: rgba(234, 246, 255, 0.82);
}

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

.prose h2,
.prose h3 {
  color: var(--ice);
  margin-top: 1.9em;
}

.prose h2 { font-size: clamp(1.5rem, 2.6vw, 2.1rem); }
.prose h3 { font-size: clamp(1.15rem, 1.8vw, 1.45rem); }

.prose ul,
.prose ol {
  padding-left: 1.35em;
  display: grid;
  gap: 0.45em;
}

.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li::marker { color: var(--neon-cyan); }

.prose a {
  color: var(--neon-cyan);
  text-decoration: underline;
  text-underline-offset: 0.24em;
}

.prose a:hover { color: var(--ice); }

.prose blockquote {
  border-left: 2px solid var(--neon-magenta);
  padding-left: 1.1rem;
  color: var(--steel);
  font-style: normal;
}

.prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: rgba(33, 243, 255, 0.1);
  border: 1px solid var(--edge-soft);
  padding: 0.08em 0.38em;
  color: var(--neon-cyan);
}

/* ---------- 7. 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
}

.crumbs__link {
  color: var(--steel);
  text-decoration: none;
  transition: color var(--dur) var(--ease-out);
}

.crumbs__link:hover { color: var(--neon-cyan); }

.crumbs__sep { color: rgba(143, 163, 184, 0.5); }

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

/* ---------- 8. 按钮与标签 ---------- */
.btn {
  --btn-cut: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6em;
  padding: 0.85rem 1.4rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ice);
  background: rgba(18, 24, 38, 0.82);
  border: 1px solid var(--edge);
  clip-path: polygon(
    0 0,
    calc(100% - var(--btn-cut)) 0,
    100% var(--btn-cut),
    100% 100%,
    var(--btn-cut) 100%,
    0 calc(100% - var(--btn-cut))
  );
  transition: background var(--dur) var(--ease-out),
    color var(--dur) var(--ease-out),
    border-color var(--dur) var(--ease-out),
    transform var(--dur) var(--ease-out);
}

.btn:hover {
  border-color: var(--edge-hard);
  background: rgba(33, 243, 255, 0.12);
  transform: translateY(-2px);
}

.btn--primary {
  background: linear-gradient(100deg, var(--neon-magenta), var(--volt-purple));
  border-color: transparent;
  color: #070B12;
  font-weight: 700;
}

.btn--primary:hover {
  background: linear-gradient(100deg, var(--volt-purple), var(--neon-magenta));
  color: #070B12;
}

.btn--ghost {
  background: transparent;
  border-color: rgba(33, 243, 255, 0.45);
  color: var(--neon-cyan);
}

.btn--ghost:hover {
  background: rgba(33, 243, 255, 0.14);
  color: var(--ice);
}

.tag {
  display: inline-block;
  padding: 0.28rem 0.6rem;
  background: var(--paper);
  color: #0A0F16;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transform: rotate(-1.5deg);
}

.tag--cyan { background: var(--neon-cyan); color: #04141A; }
.tag--lime { background: var(--volt-lime); color: #08130A; }

/* ---------- 9. 图片容器基础（页面阶段放置占位图） ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  background: var(--ink-carbon);
  border: 1px solid var(--edge-soft);
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  aspect-ratio: 16 / 10;
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 11, 18, 0) 48%, rgba(7, 11, 18, 0.86));
  pointer-events: none;
}

.media--wide img { aspect-ratio: 21 / 9; }
.media--portrait img { aspect-ratio: 3 / 4; }
.media--square img { aspect-ratio: 1 / 1; }

.media__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 1;
  padding: 0.75rem 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--steel);
}

.media__tag {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 1;
  padding: 0.2rem 0.55rem;
  background: var(--paper);
  color: #0A0F16;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transform: rotate(-2deg);
}

/* ---------- 10. 筛选与显现协议 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.filter-btn {
  padding: 0.55rem 0.95rem;
  background: transparent;
  border: 1px solid rgba(143, 163, 184, 0.32);
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color var(--dur) var(--ease-out),
    background var(--dur) var(--ease-out),
    border-color var(--dur) var(--ease-out);
}

.filter-btn:hover {
  color: var(--ice);
  border-color: var(--edge-hard);
}

.filter-btn[aria-pressed="true"] {
  background: var(--neon-cyan);
  border-color: var(--neon-cyan);
  color: #04141A;
  font-weight: 700;
}

[data-filter-item][hidden] { display: none !important; }

.reveal-ready [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.42s var(--ease-out), transform 0.42s var(--ease-out);
}

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

/* ---------- 11. Skip link ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: var(--z-skip);
  padding: 0.75rem 1.15rem;
  background: var(--neon-cyan);
  color: #04141A;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-decoration: none;
  transform: translateY(-140%);
  transition: transform 0.2s var(--ease-out);
}

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

/* ---------- 12. 刊头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: linear-gradient(180deg, rgba(7, 11, 18, 0.97), rgba(7, 11, 18, 0.84));
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--edge);
  transition: box-shadow var(--dur) var(--ease-out), background var(--dur) var(--ease-out);
}

.site-header.is-collapsed {
  background: rgba(6, 9, 16, 0.97);
  box-shadow: 0 16px 44px -26px rgba(33, 243, 255, 0.75);
}

.scanline {
  display: block;
  height: 2px;
  background: linear-gradient(90deg, var(--neon-magenta), var(--neon-cyan) 38%, var(--volt-purple) 70%, var(--volt-lime));
  opacity: 0.85;
}

.masthead {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: clamp(10px, 2vw, 28px);
  width: var(--shell);
  margin-inline: auto;
  padding-block: clamp(12px, 1.6vw, 20px);
  transition: padding var(--dur) var(--ease-out);
}

.masthead__meta {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--steel);
}

.masthead__meta--left {
  justify-content: flex-start;
  transition: opacity var(--dur) var(--ease-out), visibility var(--dur) var(--ease-out);
}

.masthead__meta--right {
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
  gap: 0.2rem;
}

.masthead__status { white-space: nowrap; }

.status-dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--volt-lime);
  box-shadow: 0 0 0 3px rgba(182, 255, 59, 0.16);
  animation: pulseDot 2.4s ease-in-out infinite;
}

@keyframes pulseDot {
  0%, 100% { box-shadow: 0 0 0 3px rgba(182, 255, 59, 0.16); }
  50% { box-shadow: 0 0 0 6px rgba(182, 255, 59, 0.05); }
}

.masthead__brand {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.1rem;
  text-decoration: none;
  justify-self: center;
}

.masthead__wordmark {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 2.6vw, 2.15rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--ice);
  text-shadow:
    0.06em 0.06em 0 rgba(255, 46, 154, 0.55),
    -0.045em -0.045em 0 rgba(33, 243, 255, 0.4);
  transition: font-size var(--dur) var(--ease-out), text-shadow var(--dur) var(--ease-out);
}

.masthead__sub {
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--steel);
}

.masthead__coord {
  display: none;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.05rem;
  padding-left: 0.7rem;
  border-left: 1px solid var(--edge);
}

.masthead__coord-label {
  font-size: 0.5625rem;
  letter-spacing: 0.2em;
  color: var(--steel);
}

.masthead__coord-value {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--neon-cyan);
  font-variant-numeric: tabular-nums;
}

.site-header.is-collapsed .masthead { padding-block: 7px; }
.site-header.is-collapsed .masthead__meta--left { opacity: 0; visibility: hidden; }
.site-header.is-collapsed .masthead__meta--right .masthead__status { display: none; }
.site-header.is-collapsed .masthead__coord { display: flex; }
.site-header.is-collapsed .masthead__wordmark {
  font-size: 1.05rem;
  text-shadow: 0.05em 0.05em 0 rgba(255, 46, 154, 0.5);
}
.site-header.is-collapsed .masthead__sub { display: none; }

/* ---------- 13. 主栏目 ---------- */
.mast-nav {
  border-top: 1px solid var(--hair);
}

.mast-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(4px, 1.4vw, 26px);
  width: var(--shell);
  margin-inline: auto;
}

.mast-nav__item { display: block; }

.mast-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.45em;
  padding: 0.78rem 0.3rem;
  color: var(--steel);
  font-size: 0.9375rem;
  letter-spacing: 0.06em;
  text-decoration: none;
  transition: color var(--dur) var(--ease-out), padding var(--dur) var(--ease-out);
}

.mast-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.32rem;
  height: 2px;
  background: linear-gradient(90deg, var(--neon-magenta), var(--neon-cyan));
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease-out);
}

.mast-nav__link:hover { color: var(--ice); }
.mast-nav__link:hover::after { transform: scaleX(1); }

.mast-nav__link[aria-current="page"] { color: var(--ice); }

.mast-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: linear-gradient(90deg, var(--neon-cyan), var(--volt-purple));
}

.mast-nav__index {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.08em;
  color: var(--neon-cyan);
  opacity: 0.8;
  font-variant-numeric: tabular-nums;
}

.site-header.is-collapsed .mast-nav__link {
  padding-block: 0.42rem;
  font-size: 0.8125rem;
}

.site-header.is-collapsed .mast-nav__index { display: none; }

/* ---------- 14. 阅读进度轨 ---------- */
.scroll-rail {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(143, 163, 184, 0.12);
  overflow: hidden;
  pointer-events: none;
}

.scroll-rail__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--neon-cyan), var(--neon-magenta) 55%, var(--volt-lime));
  transition: width 0.12s linear;
}

/* ---------- 15. 移动导航按钮 ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  justify-self: end;
  width: 44px;
  height: 44px;
  padding: 0;
  background: rgba(18, 24, 38, 0.9);
  border: 1px solid var(--edge);
  border-radius: 2px;
  cursor: pointer;
}

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ice);
  transition: transform var(--dur) var(--ease-out), opacity var(--dur) var(--ease-out),
    background var(--dur) var(--ease-out);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background: var(--neon-magenta);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--neon-cyan);
}

/* ---------- 16. 移动快捷条 ---------- */
.mobile-dock { display: none; }

/* ---------- 17. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 110px);
  padding-top: clamp(36px, 6vw, 76px);
  background: linear-gradient(180deg, #05080F 0%, #0A101B 42%, #070B12 100%);
  border-top: 1px solid var(--edge-soft);
  color: var(--steel);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--neon-cyan), var(--volt-purple) 48%, var(--neon-magenta) 82%, var(--volt-lime));
  opacity: 0.8;
}

.footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: clamp(28px, 5vw, 72px);
  padding-bottom: clamp(28px, 4vw, 52px);
}

.footer__brand { min-width: 0; }

.footer__wordmark {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 0.9;
  letter-spacing: -0.02em;
  text-decoration: none;
  background: linear-gradient(100deg, var(--ice) 8%, var(--neon-cyan) 54%, var(--neon-magenta) 96%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.footer__tagline {
  margin-top: 0.95rem;
  max-width: 34ch;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--steel);
}

.footer__stamp {
  display: inline-block;
  margin-top: 1.15rem;
  padding: 0.32rem 0.6rem;
  background: var(--paper);
  color: #0A0F16;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  transform: rotate(-1.5deg);
}

.footer__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 44px);
}

.footer__block { min-width: 0; }

.footer__title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--neon-cyan);
}

.footer__title::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--neon-magenta);
  flex: none;
}

.footer__list {
  display: grid;
  gap: 0.55rem;
}

.footer__link {
  color: var(--steel);
  font-size: 0.9375rem;
  text-decoration: none;
  transition: color var(--dur) var(--ease-out);
}

.footer__link:hover { color: var(--ice); }

.footer__contact { gap: 0.8rem; }

.footer__contact-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.footer__label {
  padding: 0.1rem 0.4rem;
  border: 1px solid var(--edge-soft);
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
}

.footer__value {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--ice);
  word-break: break-word;
  font-variant-numeric: tabular-nums;
}

.copy-btn {
  padding: 0.16rem 0.45rem;
  background: transparent;
  border: 1px solid rgba(33, 243, 255, 0.4);
  color: var(--neon-cyan);
  font-family: var(--font-mono);
  font-size: 0.5625rem;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: background var(--dur) var(--ease-out), color var(--dur) var(--ease-out),
    border-color var(--dur) var(--ease-out);
}

.copy-btn:hover {
  background: rgba(33, 243, 255, 0.14);
  color: var(--ice);
}

.copy-btn.is-copied {
  background: var(--volt-lime);
  border-color: var(--volt-lime);
  color: #08130A;
}

.footer__note {
  margin-top: 1rem;
  max-width: 40ch;
  font-size: 0.8125rem;
  line-height: 1.75;
  color: var(--steel);
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-block: 1.1rem;
  border-top: 1px solid var(--edge-soft);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: rgba(143, 163, 184, 0.85);
}

.footer__copy,
.footer__icsp {
  max-width: none;
  font-variant-numeric: tabular-nums;
}

/* ---------- 18. 平板 ---------- */
@media (max-width: 1024px) {
  .footer__top { grid-template-columns: minmax(0, 1fr); }
  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-4,
  .span-6,
  .span-8 { grid-column: span 6; }
  .span-12 { grid-column: span 6; }

  .masthead {
    grid-template-columns: 44px minmax(0, 1fr) 44px;
    padding-block: 10px;
    gap: 0.5rem;
  }

  .masthead__meta--left { justify-content: flex-start; }
  .masthead__meta--left .masthead__status { display: none; }
  .masthead__meta--right { display: none; }

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

  .mast-nav {
    display: none;
    background: linear-gradient(180deg, #0A111C, #070B12);
    border-top: 1px solid var(--edge-soft);
    max-height: calc(100dvh - 76px);
    overflow-y: auto;
  }

  .mast-nav[data-open="true"] {
    display: block;
    animation: navDrop 0.24s var(--ease-out) both;
  }

  .mast-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    padding-block: 0.4rem 1rem;
  }

  .mast-nav__link {
    display: flex;
    justify-content: flex-start;
    padding: 0.95rem var(--gutter);
    font-size: 1rem;
    border-bottom: 1px dashed var(--hair);
  }

  .mast-nav__link::after { display: none; }

  .mast-nav__link[aria-current="page"] {
    color: var(--neon-cyan);
    background: rgba(33, 243, 255, 0.07);
  }

  .site-header.is-collapsed .mast-nav__link {
    padding-block: 0.95rem;
    font-size: 1rem;
  }

  .mobile-dock {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--z-dock);
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    background: rgba(8, 13, 21, 0.97);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border-top: 1px solid var(--edge);
    padding-bottom: env(safe-area-inset-bottom, 0px);
  }

  .mobile-dock__link {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.7rem 0.2rem;
    font-family: var(--font-mono);
    font-size: 0.625rem;
    letter-spacing: 0.1em;
    color: var(--steel);
    text-decoration: none;
  }

  .mobile-dock__link::before {
    content: "";
    position: absolute;
    top: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--neon-magenta), var(--neon-cyan));
    transform: translateX(-50%);
    transition: width var(--dur) var(--ease-out);
  }

  .mobile-dock__link[aria-current="page"] { color: var(--neon-cyan); }
  .mobile-dock__link[aria-current="page"]::before { width: 100%; }

  body { padding-bottom: 56px; }
  body.nav-open { overflow: hidden; }
}

@keyframes navDrop {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 19. 手机 ---------- */
@media (max-width: 560px) {
  .grid-12 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .span-4,
  .span-6,
  .span-8,
  .span-12 { grid-column: span 2; }

  .footer__grid { grid-template-columns: minmax(0, 1fr); }
  .footer__legal { justify-content: flex-start; }
  .footer__wordmark { font-size: clamp(1.9rem, 9vw, 2.6rem); }
  .masthead__wordmark { font-size: 1.35rem; }
  .btn { width: 100%; }
}

/* ---------- 20. 动效偏好 ---------- */
@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;
  }

  .status-dot { animation: none; }

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