/* ============================================================
   博电竞对局 — 共享样式 /assets/site.css
   1 令牌 · 2 reset · 3 中文排版 · 4 布局 · 5 页头 · 6 导航
   7 页脚 · 8 组件 · 9 长文 · 10 媒体容器 · 11 状态 · 12 响应式
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root {
  --ink-900: #07090C;
  --ink-850: #0B0F14;
  --ink-800: #11151B;
  --ink-700: #1A2028;
  --line: #2A323D;
  --line-soft: rgba(244, 247, 245, 0.10);
  --line-strong: rgba(244, 247, 245, 0.24);

  --paper: #F4F7F5;
  --paper-80: rgba(244, 247, 245, 0.82);
  --paper-60: rgba(244, 247, 245, 0.62);
  --paper-40: rgba(244, 247, 245, 0.42);

  --green: #B6FF3B;
  --magenta: #FF3D8D;
  --blue: #3DA9FF;
  --mint: #7FE7C4;
  --amber: #FFB020;
  --green-dim: rgba(182, 255, 59, 0.14);
  --magenta-dim: rgba(255, 61, 141, 0.14);
  --blue-dim: rgba(61, 169, 255, 0.14);
  --mint-dim: rgba(127, 231, 196, 0.12);
  --amber-dim: rgba(255, 176, 32, 0.12);

  --font-ui: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-display: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans CJK SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --shell: 1280px;
  --gutter: clamp(18px, 4.2vw, 44px);
  --sp-1: 8px;
  --sp-2: 16px;
  --sp-3: 24px;
  --sp-4: 32px;
  --sp-5: 48px;
  --sp-6: 72px;
  --sp-7: 104px;

  --radius-s: 4px;
  --radius-m: 10px;
  --radius-l: 18px;
  --ease: cubic-bezier(0.22, 0.7, 0.24, 1);
  --shadow-glass: 0 18px 48px rgba(0, 0, 0, 0.45);
}

/* ---------- 2. reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 132px;
}

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

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

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

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

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

main { display: block; }

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

/* ---------- 3. 中文排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(120% 78% at 12% -12%, rgba(61, 169, 255, 0.10), transparent 62%),
    radial-gradient(96% 68% at 102% -4%, rgba(182, 255, 59, 0.08), transparent 58%),
    radial-gradient(110% 62% at 50% 118%, rgba(255, 61, 141, 0.07), transparent 62%);
  background-attachment: fixed;
  color: var(--paper-80);
  font-family: var(--font-ui);
  font-size: clamp(16px, 1.05vw, 17px);
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.12;
  color: var(--paper);
}

h1 { font-size: clamp(38px, 5.4vw, 76px); line-height: 1.02; }
h2 { font-size: clamp(28px, 3.2vw, 44px); }
h3 { font-size: clamp(20px, 1.9vw, 26px); letter-spacing: -0.01em; }
h4 { font-size: 18px; line-height: 1.3; }

p { max-width: 68ch; }

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

::selection { background: var(--green); color: var(--ink-900); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: var(--sp-2);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--green);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--green);
  transform: skewX(-18deg);
}

.lead {
  max-width: 60ch;
  font-size: clamp(17px, 1.4vw, 20px);
  line-height: 1.8;
  color: var(--paper-80);
}

/* ---------- 4. 布局 ---------- */
.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: 820px; }

.section { padding-block: clamp(56px, 7vw, 110px); }
.section--tight { padding-block: clamp(36px, 4vw, 64px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 32px;
  margin-bottom: clamp(24px, 3.4vw, 44px);
}

.section-title { font-size: clamp(26px, 3.2vw, 44px); }

.section-desc {
  max-width: 56ch;
  font-size: 15.5px;
  color: var(--paper-60);
}

.grid {
  display: grid;
  gap: clamp(16px, 2vw, 26px);
}

.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)); }

.split {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 56px);
  align-items: start;
}

.stack { display: flex; flex-direction: column; gap: var(--sp-3); }

.divider {
  height: 1px;
  margin-block: clamp(24px, 3vw, 44px);
  background: var(--line-soft);
  border: 0;
}

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

/* ---------- 5. 页头 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 12px 20px;
  border-radius: var(--radius-s);
  background: var(--green);
  color: var(--ink-900);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  transform: translateY(-180%);
  transition: transform 0.2s var(--ease);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(7, 9, 12, 0.82);
  border-bottom: 1px solid var(--line-soft);
  backdrop-filter: blur(14px) saturate(120%);
  -webkit-backdrop-filter: blur(14px) saturate(120%);
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(7, 9, 12, 0.95);
  border-bottom-color: var(--line);
}

.progress-rail {
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 2px;
  overflow: hidden;
  background: rgba(244, 247, 245, 0.08);
}

.progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--mint) 55%, var(--blue));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.12s linear;
}

.header-inner {
  position: relative;
  padding-block: 14px 0;
}

.masthead {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--sp-2);
}

.brand {
  grid-column: 2;
  justify-self: center;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 4px 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background: var(--green);
  color: var(--ink-900);
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -0.04em;
  clip-path: polygon(0 0, 100% 0, 100% 74%, 74% 100%, 0 100%);
}

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

.brand-name {
  font-family: var(--font-display);
  font-size: clamp(20px, 2vw, 26px);
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.brand-line {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--paper-40);
}

.brand:hover .brand-name { color: var(--green); }

.masthead-meta {
  grid-column: 3;
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 10px;
}

.version-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(26, 32, 40, 0.6);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--paper-80);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.version-chip:hover { color: var(--green); border-color: var(--green); }

.version-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px var(--green-dim);
}

.version-text { line-height: 1; }

.member-entry {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--green);
  color: var(--ink-900);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  transition: transform 0.18s var(--ease), background 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.member-entry:hover {
  background: #C9FF72;
  transform: translateY(-1px);
  box-shadow: 0 10px 26px rgba(182, 255, 59, 0.22);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(26, 32, 40, 0.7);
  color: var(--paper);
  font-size: 13px;
  transition: border-color 0.18s var(--ease);
}

.nav-toggle:hover { border-color: var(--green); }

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 16px;
}

.nav-toggle-bar {
  display: block;
  height: 2px;
  background: var(--paper);
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.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(-6px) rotate(-45deg); }

.nav-toggle-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
}

/* ---------- 6. 导航 ---------- */
.primary-nav {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 6px;
  padding-block: 8px;
  border-top: 1px solid var(--line-soft);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: clamp(4px, 1.6vw, 18px);
}

.nav-item { min-width: 0; }

.nav-link {
  position: relative;
  display: inline-block;
  padding: 8px 10px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--paper-60);
  transition: color 0.18s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 2px;
  height: 2px;
  background: var(--green);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.26s var(--ease);
}

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

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

.nav-utility {
  position: absolute;
  inset-inline-end: 0;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-utility-label {
  margin-inline-end: 4px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--paper-40);
}

.region-chip {
  padding: 4px 9px;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--paper-60);
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.region-chip:hover {
  background: var(--green);
  border-color: var(--green);
  color: var(--ink-900);
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(72px, 9vw, 140px);
  background: linear-gradient(180deg, var(--ink-800), var(--ink-900) 72%);
  border-top: 1px solid var(--line);
  color: var(--paper-60);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 2px;
  background: linear-gradient(90deg, var(--green), var(--blue) 46%, var(--magenta));
}

.footer-inner { padding-block: clamp(40px, 6vw, 72px) 0; }

.footer-masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: clamp(24px, 4vw, 40px);
  border-bottom: 1px solid var(--line-soft);
}

.footer-brand-block {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-brand {
  font-family: var(--font-display);
  font-size: clamp(24px, 2.6vw, 34px);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper);
  transition: color 0.18s var(--ease);
}

.footer-brand:hover { color: var(--green); }

.footer-tagline {
  max-width: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--paper-40);
}

.footer-version {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--paper-40);
}

.footer-version-link {
  color: var(--green);
  border-bottom: 1px solid rgba(182, 255, 59, 0.4);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.footer-version-link:hover { color: var(--paper); border-bottom-color: var(--paper); }

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(24px, 3vw, 48px);
  padding-block: clamp(32px, 4.5vw, 56px);
}

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

.footer-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--green);
}

.footer-title::before {
  content: "";
  width: 14px;
  height: 2px;
  background: var(--green);
  transform: skewX(-18deg);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
}

.footer-link {
  display: inline-block;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--paper-60);
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.footer-link:hover {
  color: var(--paper);
  border-bottom-color: var(--green);
}

.footer-contact {
  max-width: 36ch;
  margin-bottom: 4px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--paper-60);
}

.footer-strong {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.01em;
  color: var(--paper);
  word-break: break-word;
}

.footer-note {
  max-width: 36ch;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--paper-40);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-block: 20px 28px;
  border-top: 1px solid var(--line-soft);
  font-size: 12.5px;
  color: var(--paper-40);
}

.legal-note {
  max-width: none;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
}

.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}

.legal-links .footer-link { font-size: 12.5px; }

.footer-icp {
  max-width: none;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
}

/* ---------- 8. 基础组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-ui);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 0.18s var(--ease), background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.btn-primary {
  background: var(--green);
  color: var(--ink-900);
}

.btn-primary:hover {
  background: #C9FF72;
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(182, 255, 59, 0.2);
}

.btn-ghost {
  border-color: var(--line-strong);
  background: rgba(26, 32, 40, 0.35);
  color: var(--paper);
}

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

.btn-quiet {
  padding-inline: 0;
  border-radius: 0;
  border-bottom: 1px solid rgba(182, 255, 59, 0.35);
  color: var(--green);
}

.btn-quiet:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

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

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  background: rgba(26, 32, 40, 0.6);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--paper-60);
  white-space: nowrap;
}

.tag--green { color: var(--green); border-color: rgba(182, 255, 59, 0.4); background: var(--green-dim); }
.tag--magenta { color: var(--magenta); border-color: rgba(255, 61, 141, 0.42); background: var(--magenta-dim); }
.tag--blue { color: var(--blue); border-color: rgba(61, 169, 255, 0.42); background: var(--blue-dim); }
.tag--mint { color: var(--mint); border-color: rgba(127, 231, 196, 0.4); background: var(--mint-dim); }
.tag--amber { color: var(--amber); border-color: rgba(255, 176, 32, 0.4); background: var(--amber-dim); }

.panel {
  padding: clamp(20px, 2.4vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--ink-800);
}

.panel--glass {
  border-color: var(--line-soft);
  background: rgba(26, 32, 40, 0.55);
  box-shadow: var(--shadow-glass);
  backdrop-filter: blur(12px) saturate(115%);
  -webkit-backdrop-filter: blur(12px) saturate(115%);
}

.panel--flat {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: transparent;
  padding: clamp(20px, 2.4vw, 30px);
}

.panel-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--paper-60);
}

.panel-title::before {
  content: "";
  width: 12px;
  height: 2px;
  background: var(--green);
  transform: skewX(-18deg);
}

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

/* ---------- 9. 面包屑与长文 ---------- */
.breadcrumb {
  padding-block: 16px;
  margin-bottom: clamp(24px, 3vw, 40px);
  border-bottom: 1px solid var(--line-soft);
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--paper-40);
}

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

.breadcrumb-list li + li::before {
  content: "/";
  color: var(--line-strong);
}

.breadcrumb-link {
  color: var(--paper-60);
  transition: color 0.18s var(--ease);
}

.breadcrumb-link:hover { color: var(--green); }

.breadcrumb-current { color: var(--paper); }

.prose {
  max-width: 72ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--paper-80);
}

.prose > * + * { margin-top: 1.15em; }

.prose h2 {
  margin-top: 2em;
  font-size: clamp(24px, 2.6vw, 32px);
}

.prose h3 {
  margin-top: 1.6em;
  font-size: 20px;
}

.prose ul { padding-left: 0; }

.prose ul li {
  position: relative;
  padding-left: 20px;
}

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 2px;
  background: var(--green);
}

.prose ol { counter-reset: prose-count; }

.prose ol li {
  position: relative;
  padding-left: 28px;
  counter-increment: prose-count;
}

.prose ol li::before {
  content: counter(prose-count, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--green);
}

.prose a {
  color: var(--blue);
  border-bottom: 1px solid rgba(61, 169, 255, 0.35);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.prose a:hover {
  color: var(--green);
  border-bottom-color: var(--green);
}

/* ---------- 10. 媒体容器 ---------- */
.media-frame {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: var(--ink-700);
}

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

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(7, 9, 12, 0) 42%, rgba(7, 9, 12, 0.74));
  pointer-events: none;
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--portrait { aspect-ratio: 3 / 4; }

.media-frame--diagonal {
  clip-path: polygon(0 0, 100% 0, 100% 88%, 88% 100%, 0 100%);
}

.media-caption {
  max-width: none;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--paper-40);
}

/* ---------- 11. 交互状态 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

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

.spy-link {
  display: block;
  padding: 6px 0;
  font-size: 14px;
  color: var(--paper-60);
  transition: color 0.18s var(--ease);
}

.spy-link:hover { color: var(--paper); }

.spy-link.is-active {
  color: var(--green);
  font-weight: 600;
}

/* ---------- 12. 响应式 ---------- */
@media (max-width: 1100px) {
  .masthead {
    grid-template-columns: 1fr auto;
    gap: 10px;
  }

  .brand {
    grid-column: 1;
    justify-self: start;
  }

  .masthead-meta {
    grid-column: 2;
    justify-self: end;
    gap: 8px;
  }

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

  .primary-nav {
    display: none;
    position: absolute;
    inset-inline: 0;
    top: 100%;
    margin-top: 0;
    padding: 12px var(--gutter) 22px;
    background: rgba(11, 15, 20, 0.98);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-glass);
    max-height: calc(100vh - 84px);
    overflow-y: auto;
  }

  .primary-nav[data-open] {
    display: block;
    animation: nav-enter 0.22s var(--ease) both;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
  }

  .nav-link {
    padding: 13px 4px;
    font-size: 17px;
    border-bottom: 1px solid var(--line-soft);
  }

  .nav-link::after {
    left: 4px;
    right: auto;
    bottom: 9px;
    width: 24px;
  }

  .nav-utility {
    position: static;
    transform: none;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px solid var(--line-soft);
  }

  .nav-utility-label {
    width: 100%;
    margin: 0 0 4px;
  }

  .region-chip {
    padding: 8px 14px;
    font-size: 12px;
  }
}

@keyframes nav-enter {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 960px) {
  html { scroll-padding-top: 100px; }

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

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

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

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

@media (max-width: 640px) {
  .version-text { display: none; }
  .version-chip { padding: 7px 9px; }

  .member-entry {
    padding: 8px 14px;
    font-size: 13px;
  }

  .brand-mark {
    width: 32px;
    height: 32px;
    font-size: 17px;
  }

  .brand-line { display: none; }

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

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

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

  .section-head { flex-direction: column; align-items: flex-start; }

  .btn { width: 100%; }
}

@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;
    scroll-behavior: auto !important;
  }

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

  .progress-bar { transition: none; }
}