/* ============================================================
   爱游戏赛事 · 共享样式表  /assets/site.css
   午夜基底 + 蓝图网格 + 电竞霓虹
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

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

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

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

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

button { background: none; border: 0; padding: 0; cursor: pointer; }

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

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

summary { cursor: pointer; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 色彩 */
  --c-void: #060A1C;
  --c-panel: #0E1430;
  --c-panel-hi: #151D45;
  --c-line: #1B2450;
  --c-line-soft: rgba(27, 36, 80, .72);
  --c-cyan: #29F0DE;
  --c-violet: #8A5CFF;
  --c-warn: #FF8A3C;
  --c-ink: #EAF0FF;
  --c-muted: #95A2D0;
  --c-glow: #B9FBFF;
  --c-mint: #4DE39B;

  /* 字体 */
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC",
               "Noto Sans SC", "Microsoft YaHei", system-ui, -apple-system,
               "Segoe UI", Roboto, sans-serif;
  --font-display: "PingFang SC", "Hiragino Sans GB", system-ui, -apple-system,
                  "Segoe UI", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular,
               Menlo, Consolas, "Courier New", monospace;

  /* 尺寸 */
  --shell: 1240px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --rail: 68px;

  /* 形状 */
  --r-sm: 4px;
  --r-md: 8px;
  --r-lg: 14px;

  /* 阴影与光 */
  --shadow-card: inset 0 1px 0 rgba(255, 255, 255, .035),
                 0 22px 44px -32px rgba(0, 0, 0, .95);
  --glow-cyan: 0 0 22px -6px rgba(41, 240, 222, .7);
  --glow-violet: 0 0 26px -8px rgba(138, 92, 255, .75);

  /* 动效 */
  --dur: .18s;
  --ease: cubic-bezier(.2, .7, .3, 1);
}

/* ---------- 3. 基础排版与页面底色 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  color: var(--c-ink);
  background-color: var(--c-void);
  background-image:
    radial-gradient(1100px 720px at 6% -14%, rgba(138, 92, 255, .20), transparent 62%),
    radial-gradient(900px 640px at 100% 2%, rgba(41, 240, 222, .13), transparent 60%),
    linear-gradient(to right, rgba(27, 36, 80, .52) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(27, 36, 80, .52) 1px, transparent 1px);
  background-size: auto, auto, 88px 88px, 88px 88px;
  background-repeat: no-repeat, no-repeat, repeat, repeat;
  background-attachment: fixed, fixed, fixed, fixed;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#main-content { display: block; outline: none; scroll-margin-top: 96px; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -.012em;
  color: var(--c-ink);
}

h1 { font-size: clamp(2rem, 5.2vw, 3.5rem); font-weight: 900; }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.15rem); }
h3 { font-size: clamp(1.1rem, 1.9vw, 1.35rem); font-weight: 700; }

p { font-size: 1rem; line-height: 1.75; }
p + p { margin-top: .9em; }

a:hover { color: var(--c-cyan); }

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

::selection { background: rgba(41, 240, 222, .28); color: var(--c-glow); }

/* ---------- 4. 工具类 ---------- */
.mono {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .06em;
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.rule {
  height: 1px;
  border: 0;
  margin: clamp(2rem, 4vw, 3.5rem) 0;
  background: linear-gradient(90deg, transparent, var(--c-line) 12%, var(--c-line) 88%, transparent);
}

/* ---------- 5. 容器与章节骨架 ---------- */
.shell {
  width: min(var(--shell), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
}

.shell--narrow { max-width: 760px; }

.section {
  position: relative;
  padding-block: clamp(3rem, 7vw, 6rem);
}

.section--tight { padding-block: clamp(1.75rem, 3.5vw, 3rem); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .6rem 1.25rem;
  padding-bottom: .95rem;
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
  border-bottom: 1px solid var(--c-line);
}

.section-title { margin: 0; }

.section-note {
  flex: 1 1 220px;
  min-width: 0;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--c-muted);
  text-align: right;
}

.index-tag {
  display: inline-flex;
  align-items: center;
  padding: .22rem .55rem;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .2em;
  color: var(--c-cyan);
  border: 1px solid rgba(41, 240, 222, .35);
  border-radius: 2px;
  background: rgba(41, 240, 222, .07);
  white-space: nowrap;
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  padding: .58rem 1.05rem;
  border: 1px solid transparent;
  border-radius: 3px;
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1.4;
  white-space: nowrap;
  cursor: pointer;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease),
              border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  color: #04121A;
  background: linear-gradient(100deg, #29F0DE 0%, #7CF2E4 52%, #B9FBFF 100%);
  box-shadow: 0 0 0 1px rgba(41, 240, 222, .35), 0 14px 30px -16px rgba(41, 240, 222, .95);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  color: #FFFFFF;
  background: linear-gradient(100deg, #8A5CFF 0%, #29F0DE 100%);
  box-shadow: 0 0 0 1px rgba(138, 92, 255, .5), 0 16px 36px -14px rgba(138, 92, 255, .95);
}

.btn-ghost {
  color: var(--c-cyan);
  border-color: rgba(41, 240, 222, .38);
  background: rgba(41, 240, 222, .06);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  color: var(--c-glow);
  border-color: var(--c-cyan);
  background: rgba(41, 240, 222, .14);
}

.btn-sm { padding: .44rem .8rem; font-size: .75rem; }

/* ---------- 7. 头部：导航即外框 ---------- */
.skip-link {
  position: absolute;
  left: 50%;
  top: 0;
  z-index: 120;
  padding: .6rem 1.1rem;
  font-size: .8125rem;
  font-weight: 700;
  letter-spacing: .05em;
  color: #04121A;
  background: var(--c-cyan);
  border-radius: 0 0 4px 4px;
  transform: translate(-50%, -130%);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translate(-50%, 0);
  outline-offset: -3px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, rgba(6, 10, 28, .97) 0%, rgba(6, 10, 28, .86) 100%);
  -webkit-backdrop-filter: blur(12px) saturate(140%);
  backdrop-filter: blur(12px) saturate(140%);
  border-bottom: 1px solid var(--c-line);
  transition: box-shadow var(--dur) var(--ease);
}

.site-header.is-stuck { box-shadow: 0 20px 42px -38px rgba(0, 0, 0, .98); }

.header-inner {
  position: relative;
  width: min(var(--shell), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: clamp(.6rem, 1.6vw, 1.5rem);
  min-height: var(--rail);
  padding-inline: clamp(.75rem, 1.5vw, 1.25rem);
  border-left: 1px solid var(--c-line-soft);
  border-right: 1px solid var(--c-line-soft);
  transition: min-height var(--dur) var(--ease);
}

.site-header.is-stuck .header-inner { min-height: 58px; }

.header-inner::before,
.header-inner::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 5px;
  height: 5px;
  background: var(--c-void);
  border: 1px solid var(--c-cyan);
  opacity: .6;
  transform: translateY(-50%) rotate(45deg);
  pointer-events: none;
}

.header-inner::before { left: -3px; }
.header-inner::after { right: -3px; }

/* 品牌 */
.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: .6rem;
  flex: 0 0 auto;
  color: var(--c-ink);
  text-decoration: none;
}

.brand-lockup:hover { color: var(--c-ink); }

.brand-glyph {
  position: relative;
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  border: 1px solid var(--c-cyan);
  border-radius: 3px;
  box-shadow: var(--glow-cyan);
}

.brand-glyph::before {
  content: "";
  position: absolute;
  inset: 4px;
  border-radius: 1px;
  background: linear-gradient(135deg, var(--c-cyan), var(--c-violet));
}

.brand-glyph::after {
  content: "";
  position: absolute;
  left: 50%;
  top: -5px;
  width: 1px;
  height: 7px;
  background: var(--c-cyan);
  transform: translateX(-50%);
}

.brand-copy { display: grid; gap: .05rem; min-width: 0; }

.brand-text {
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 800;
  letter-spacing: .02em;
  line-height: 1.25;
}

.brand-meta {
  font-family: var(--font-mono);
  font-size: .5625rem;
  letter-spacing: .16em;
  color: var(--c-muted);
  text-transform: uppercase;
  white-space: nowrap;
}

/* 导航 */
.frame-nav { flex: 1 1 auto; min-width: 0; }

.nav-list {
  display: flex;
  align-items: center;
  gap: .15rem;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: .42rem .7rem;
  font-size: .8125rem;
  letter-spacing: .04em;
  color: var(--c-muted);
  border: 1px solid transparent;
  border-radius: 3px;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease),
              border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.nav-link:hover {
  color: var(--c-ink);
  border-color: var(--c-line);
  background: rgba(138, 92, 255, .12);
}

.nav-link[aria-current="page"] {
  color: var(--c-cyan);
  border-color: rgba(41, 240, 222, .42);
  background: rgba(41, 240, 222, .09);
  box-shadow: 0 0 18px -8px rgba(41, 240, 222, .95);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: .5rem;
  flex: 0 0 auto;
  margin-left: auto;
}

/* 移动导航按钮（桌面隐藏） */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  gap: .4rem;
  padding: .48rem .7rem;
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--c-ink);
  border: 1px solid var(--c-line);
  border-radius: 3px;
  background: rgba(14, 20, 48, .82);
}

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
  flex: 0 0 auto;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1.5px;
  border-radius: 2px;
  background: var(--c-cyan);
  transition: transform var(--dur) var(--ease), top var(--dur) var(--ease);
}

.nav-toggle-bars::before { top: 2px; }
.nav-toggle-bars::after { top: 8px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 5px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { top: 5px; transform: rotate(-45deg); }

/* 顶部阅读进度 */
.progress-track {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  background: rgba(27, 36, 80, .7);
  pointer-events: none;
}

.progress-fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--c-violet), var(--c-cyan));
  box-shadow: 0 0 12px rgba(41, 240, 222, .9);
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 7rem);
  border-top: 1px solid var(--c-line);
  background:
    radial-gradient(760px 320px at 12% 0%, rgba(138, 92, 255, .16), transparent 68%),
    linear-gradient(180deg, rgba(14, 20, 48, .55) 0%, rgba(6, 10, 28, .96) 100%);
}

.footer-inner {
  width: min(var(--shell), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
  padding-top: clamp(2.25rem, 4.5vw, 3.5rem);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(230px, 1.5fr) minmax(150px, .85fr) minmax(180px, 1fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  padding-bottom: clamp(1.75rem, 4vw, 3rem);
}

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

.footer-tagline {
  margin-top: 1rem;
  font-size: .875rem;
  line-height: 1.75;
  color: var(--c-muted);
  max-width: 34em;
}

.footer-status {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  margin-top: .9rem;
  padding: .3rem .6rem;
  font-family: var(--font-mono);
  font-size: .625rem;
  letter-spacing: .14em;
  color: var(--c-glow);
  border: 1px solid rgba(41, 240, 222, .28);
  border-radius: 2px;
  background: rgba(41, 240, 222, .06);
}

.footer-title {
  margin-bottom: .95rem;
  padding-bottom: .55rem;
  font-family: var(--font-mono);
  font-size: .6875rem;
  font-weight: 500;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--c-muted);
  border-bottom: 1px solid var(--c-line);
}

.footer-links { display: grid; gap: .5rem; }

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .875rem;
  color: var(--c-ink);
  transition: color var(--dur) var(--ease);
}

.footer-links a::before {
  content: "";
  flex: 0 0 auto;
  width: 10px;
  height: 1px;
  background: var(--c-line);
  transition: width var(--dur) var(--ease), background var(--dur) var(--ease);
}

.footer-links a:hover { color: var(--c-cyan); }
.footer-links a:hover::before { width: 18px; background: var(--c-cyan); }

.footer-address {
  margin-top: 1.1rem;
  font-size: .8125rem;
  line-height: 1.7;
  color: var(--c-muted);
}

.footer-base {
  border-top: 1px solid var(--c-line);
  background: linear-gradient(180deg, rgba(14, 20, 48, .9) 0%, rgba(14, 20, 48, .5) 100%);
}

.footer-base-inner {
  width: min(var(--shell), calc(100% - 2 * var(--gutter)));
  margin-inline: auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .75rem 2rem;
  padding-block: 1.05rem calc(1.05rem + env(safe-area-inset-bottom, 0px));
}

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem .75rem;
}

.footer-legal {
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .05em;
  color: var(--c-muted);
}

/* ---------- 9. 通用组件 ---------- */
/* 状态标记 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .2rem .5rem;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .08em;
  color: var(--c-muted);
  border: 1px solid var(--c-line);
  border-radius: 2px;
  background: rgba(27, 36, 80, .38);
  white-space: nowrap;
}

.tag--cyan {
  color: var(--c-cyan);
  border-color: rgba(41, 240, 222, .4);
  background: rgba(41, 240, 222, .08);
}

.tag--ok {
  color: var(--c-mint);
  border-color: rgba(77, 227, 155, .42);
  background: rgba(77, 227, 155, .1);
}

.tag--warn {
  color: var(--c-warn);
  border-color: rgba(255, 138, 60, .48);
  background: rgba(255, 138, 60, .1);
}

/* 脉冲光点 */
.pulse-dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 0 0 rgba(41, 240, 222, .55);
  animation: pulse-dot 2.4s ease-out infinite;
}

@keyframes pulse-dot {
  0%   { box-shadow: 0 0 0 0 rgba(41, 240, 222, .55); opacity: 1; }
  70%  { box-shadow: 0 0 0 9px rgba(41, 240, 222, 0); opacity: .82; }
  100% { box-shadow: 0 0 0 0 rgba(41, 240, 222, 0); opacity: 1; }
}

/* 数据条 */
.stat-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  background: var(--c-line);
  overflow: hidden;
}

.stat {
  display: grid;
  gap: .3rem;
  padding: 1rem 1.15rem;
  background: var(--c-panel);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--c-glow);
  font-variant-numeric: tabular-nums;
}

.stat-label {
  font-size: .75rem;
  letter-spacing: .06em;
  color: var(--c-muted);
}

/* 卡片 */
.card {
  position: relative;
  padding: clamp(1.1rem, 2.2vw, 1.6rem);
  border: 1px solid var(--c-line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(21, 29, 69, .92) 0%, rgba(14, 20, 48, .92) 100%);
  box-shadow: var(--shadow-card);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  opacity: 0;
  background: linear-gradient(115deg, rgba(41, 240, 222, .16) 0%, transparent 42%, rgba(138, 92, 255, .2) 100%);
  transition: opacity var(--dur) var(--ease);
}

.card:hover {
  border-color: rgba(41, 240, 222, .45);
  transform: translateY(-3px);
  box-shadow: 0 26px 52px -32px rgba(0, 0, 0, .95), 0 0 26px -14px rgba(41, 240, 222, .85);
}

.card:hover::before { opacity: 1; }

.card-slant {
  border-radius: 0;
  clip-path: polygon(14px 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%, 0 14px);
}

/* 修复进度条 */
.repair-bar { display: grid; gap: .5rem; }

.repair-track {
  height: 6px;
  border: 1px solid var(--c-line);
  border-radius: 99px;
  background: rgba(27, 36, 80, .85);
  overflow: hidden;
}

.repair-fill {
  display: block;
  width: var(--val, 0%);
  height: 100%;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--c-violet), var(--c-cyan));
  box-shadow: 0 0 14px rgba(41, 240, 222, .75);
}

/* 折叠面板 */
.disclosure {
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  background: rgba(14, 20, 48, .62);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease);
}

.disclosure + .disclosure { margin-top: .6rem; }

.disclosure[open] { border-color: rgba(41, 240, 222, .32); }

.disclosure > summary {
  display: flex;
  align-items: center;
  gap: .75rem;
  padding: .95rem 1.1rem;
  font-size: .9375rem;
  font-weight: 600;
  color: var(--c-ink);
  list-style: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.disclosure > summary::-webkit-details-marker { display: none; }

.disclosure > summary::after {
  content: "";
  flex: 0 0 auto;
  margin-left: auto;
  width: 9px;
  height: 9px;
  border-right: 1.5px solid var(--c-cyan);
  border-bottom: 1.5px solid var(--c-cyan);
  transform: rotate(45deg) translateY(-2px);
  transition: transform var(--dur) var(--ease);
}

.disclosure[open] > summary::after { transform: rotate(-135deg) translateY(-2px); }

.disclosure > summary:hover { background: rgba(138, 92, 255, .1); color: var(--c-glow); }

.disclosure-body {
  padding: 0 1.1rem 1.1rem;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--c-muted);
}

/* 面包屑 */
.breadcrumb { padding-top: 1.1rem; }

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .1em;
  color: var(--c-muted);
}

.breadcrumb li { display: flex; align-items: center; gap: .45rem; }

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

.breadcrumb a { color: var(--c-muted); }

.breadcrumb a:hover { color: var(--c-cyan); }

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

/* 复制按钮 */
.copy-line {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: .45rem .7rem;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .04em;
  color: var(--c-glow);
  border: 1px dashed var(--c-line);
  border-radius: var(--r-sm);
  background: rgba(14, 20, 48, .6);
  word-break: break-all;
  text-align: left;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease),
              color var(--dur) var(--ease);
}

.copy-line:hover { border-color: rgba(41, 240, 222, .5); background: rgba(41, 240, 222, .08); }

.copy-line[data-copied="true"] {
  color: var(--c-mint);
  border-color: rgba(77, 227, 155, .6);
  background: rgba(77, 227, 155, .1);
}

.copy-hint {
  flex: 0 0 auto;
  font-size: .625rem;
  letter-spacing: .1em;
  color: var(--c-muted);
}

.copy-line[data-copied="true"] .copy-hint { color: var(--c-mint); }

/* 图片容器 */
.media-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--c-line);
  border-radius: var(--r-sm);
  background: linear-gradient(150deg, rgba(21, 29, 69, .92) 0%, rgba(6, 10, 28, .92) 100%);
  overflow: hidden;
}

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

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(120deg, rgba(41, 240, 222, .12) 0%, transparent 48%, rgba(138, 92, 255, .16) 100%);
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--portrait { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__caption {
  margin-top: .6rem;
  font-family: var(--font-mono);
  font-size: .6875rem;
  letter-spacing: .08em;
  color: var(--c-muted);
}

/* 滚动显现 */
html[data-js="on"] [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .55s var(--ease) var(--d, 0ms), transform .55s var(--ease) var(--d, 0ms);
}

html[data-js="on"] [data-reveal].is-in { opacity: 1; transform: none; }

/* 章节高亮 */
[data-spy-link].is-active { color: var(--c-cyan); }

/* ---------- 10. 响应式 ---------- */
@media (max-width: 1080px) {
  .nav-link { padding-inline: .55rem; font-size: .78rem; }
}

@media (max-width: 920px) {
  .header-inner { min-height: 60px; }

  .site-header.is-stuck .header-inner { min-height: 56px; }

  .frame-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 70;
    max-height: 0;
    padding: 0 .75rem;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    border: 1px solid var(--c-line);
    border-top: 0;
    border-radius: 0 0 6px 6px;
    background: rgba(6, 10, 28, .985);
    box-shadow: 0 32px 60px -34px rgba(0, 0, 0, .98);
    transition: max-height .3s var(--ease), opacity .2s var(--ease),
                visibility .3s var(--ease), padding .3s var(--ease);
  }

  .frame-nav[data-open="true"] {
    max-height: min(68vh, 520px);
    padding: .6rem .75rem .9rem;
    overflow-y: auto;
    opacity: 1;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: .2rem;
  }

  .nav-link {
    justify-content: flex-start;
    padding: .7rem .8rem;
    font-size: .875rem;
    border-color: var(--c-line-soft);
  }

  .nav-toggle {
    display: flex;
    flex-direction: column;
    gap: 4px;
    position: fixed;
    right: max(16px, env(safe-area-inset-right, 0px));
    bottom: max(16px, env(safe-area-inset-bottom, 0px));
    z-index: 90;
    width: 58px;
    height: 58px;
    padding: 0;
    border-radius: 50%;
    border-color: rgba(41, 240, 222, .45);
    background:
      linear-gradient(140deg, rgba(41, 240, 222, .16), rgba(138, 92, 255, .24)),
      rgba(6, 10, 28, .95);
    box-shadow: 0 0 0 1px rgba(41, 240, 222, .14), 0 18px 38px -18px rgba(41, 240, 222, .95);
  }

  .nav-toggle-label {
    font-size: .5625rem;
    letter-spacing: .1em;
    color: var(--c-muted);
  }

  .nav-toggle[aria-expanded="true"] .nav-toggle-label { color: var(--c-cyan); }

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

  .footer-col:first-child { grid-column: 1 / -1; }

  body { background-attachment: scroll, scroll, scroll, scroll; }
}

@media (max-width: 640px) {
  .brand-meta { display: none; }

  .section-note { text-align: left; }

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

  .footer-col:first-child { grid-column: auto; }

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

@media (max-width: 520px) {
  .btn-sm { padding: .42rem .62rem; font-size: .6875rem; letter-spacing: .03em; }
  .brand-text { font-size: .9375rem; }
  .brand-glyph { width: 20px; height: 20px; }
  .stat-value { font-size: 1.3rem; }
}

/* 低内存机型降级：去除大面积动效 */
@media (max-width: 480px) {
  .pulse-dot { animation: none; box-shadow: 0 0 10px rgba(41, 240, 222, .8); }
}

/* ---------- 11. 无障碍：减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0ms !important;
  }

  html[data-js="on"] [data-reveal] { opacity: 1; transform: none; }

  .card:hover { transform: none; }
}