/* ============================================================
   PG娱乐 · 共享样式表 /assets/site.css
   基调：夜间数据剧场 · 深靛蓝底 + 霓虹青 / 品红 / 琥珀 / 电子紫
   ============================================================ */

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

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

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

ul, ol { list-style: none; }

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

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

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

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

/* ---------- 2. 设计令牌 ---------- */
:root {
  --ink-900: #060818;
  --ink-800: #0A0E2A;
  --ink-700: #141A45;
  --cyan: #22F3E4;
  --magenta: #FF2E88;
  --amber: #FFB020;
  --violet: #6C4CFF;
  --ice: #EDF2FF;
  --mist: #98A3C6;
  --green: #3DDC97;

  --line: rgba(152, 163, 198, 0.22);
  --line-strong: rgba(152, 163, 198, 0.42);

  --font-sans: "HarmonyOS Sans SC", "Noto Sans SC", "Source Han Sans SC",
    "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", Consolas,
    "Liberation Mono", Menlo, monospace;

  --pad-x: clamp(16px, 4vw, 48px);
  --maxw: 1280px;
  --gap: 24px;

  --shadow-card: inset 0 1px 0 rgba(237, 242, 255, 0.06), 0 18px 40px rgba(3, 5, 16, 0.45);
  --glow-cyan: 0 0 18px rgba(34, 243, 228, 0.35);
  --glow-magenta: 0 0 18px rgba(255, 46, 136, 0.32);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--ink-800);
  background-image:
    radial-gradient(900px 520px at 10% -8%, rgba(108, 76, 255, 0.20), transparent 62%),
    radial-gradient(760px 440px at 94% 2%, rgba(34, 243, 228, 0.11), transparent 66%);
  color: var(--ice);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.8;
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4 { font-weight: 900; line-height: 1.14; letter-spacing: -0.01em; }
h1 { font-size: clamp(38px, 7.2vw, 96px); }
h2 { font-size: clamp(28px, 4vw, 52px); }
h3 { font-size: clamp(20px, 2.4vw, 30px); }
h4 { font-size: 18px; line-height: 1.4; }

p { margin-bottom: 1.2em; }
p:last-child { margin-bottom: 0; }

::selection { background: rgba(34, 243, 228, 0.32); color: var(--ice); }

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

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

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -72px;
  z-index: 200;
  padding: 10px 20px;
  background: var(--cyan);
  color: #04121a;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.06em;
  transition: top 0.2s ease;
}
.skip-link:focus { top: 12px; }

/* ---------- 5. 刊头 / 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: linear-gradient(180deg, rgba(6, 8, 24, 0.98), rgba(10, 14, 42, 0.94));
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(6px);
}

.site-header::before {
  content: "";
  display: block;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 45%, var(--magenta) 78%, var(--amber));
  opacity: 0.85;
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--violet), var(--magenta));
  pointer-events: none;
}

/* 刊头三列 */
.mast-wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px var(--pad-x) 10px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 20px;
}

.mast-data {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  color: rgba(152, 163, 198, 0.5);
}

.mast-data__text {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--mist);
  white-space: nowrap;
}

.mast-data__line {
  flex: 1 1 auto;
  min-width: 24px;
  height: 1px;
  background-image: repeating-linear-gradient(90deg, currentColor 0 5px, transparent 5px 11px);
}

/* 品牌 */
.brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 2px 10px;
  text-align: center;
}

.brand__mark {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--cyan);
  text-shadow: var(--glow-cyan);
}

.brand__name {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.34em;
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 12px;
  margin: 0 var(--pad-x) 10px;
  padding: 11px 16px;
  border: 1px solid var(--line);
  background: rgba(20, 26, 69, 0.85);
  color: var(--ice);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  transition: border-color 0.2s ease, background 0.2s ease;
}
.nav-toggle:hover { border-color: rgba(34, 243, 228, 0.55); }

.nav-toggle__bars { display: grid; gap: 3px; }
.nav-toggle__bars i {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--cyan);
  transition: transform 0.24s ease, opacity 0.24s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

.nav-toggle__label { letter-spacing: 0.18em; }

/* 栏目导航 */
.site-nav {
  display: block;
  border-top: 1px solid var(--line);
}

.site-nav__list {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: clamp(10px, 2.4vw, 34px);
  overflow-x: auto;
  scrollbar-width: none;
}
.site-nav__list::-webkit-scrollbar { display: none; }

.site-nav__item { flex: 0 0 auto; }

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 12px 2px 13px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--mist);
  white-space: nowrap;
  transition: color 0.2s ease;
}

.site-nav__link::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 2px;
  width: 16px;
  height: 2px;
  margin-left: -8px;
  background: var(--amber);
  opacity: 0;
  transform: scaleX(0.3);
  transition: opacity 0.22s ease, transform 0.22s ease;
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 5px;
  height: 2px;
  background: var(--cyan);
  box-shadow: var(--glow-cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.26s ease;
}

.site-nav__link:hover { color: var(--ice); }
.site-nav__link:hover::before { opacity: 1; transform: scaleX(1); }
.site-nav__link[aria-current="page"] { color: var(--ice); }
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }

/* 悬浮快捷条 */
.qbar {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 10px var(--pad-x) 14px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.qbar__act {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 16px;
  border: 1px solid rgba(34, 243, 228, 0.35);
  background: linear-gradient(90deg, rgba(34, 243, 228, 0.10), rgba(108, 76, 255, 0.05));
  transition: border-color 0.22s ease, transform 0.22s ease, background 0.22s ease;
}
.qbar__act:nth-child(2) {
  border-color: rgba(255, 46, 136, 0.38);
  background: linear-gradient(90deg, rgba(255, 46, 136, 0.10), rgba(108, 76, 255, 0.05));
}
.qbar__act:hover { transform: translateY(-2px); border-color: var(--cyan); }
.qbar__act:nth-child(2):hover { border-color: var(--magenta); }

.qbar__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}
.qbar__act:nth-child(2) .qbar__k { color: var(--magenta); }

.qbar__t { font-size: 15px; font-weight: 700; letter-spacing: 0.04em; }

.qbar__d {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mist);
}

/* 刊头紧凑态 */
.site-header.is-compact .mast-wrap { padding-top: 8px; padding-bottom: 6px; }
.site-header.is-compact .mast-data,
.site-header.is-compact .brand__sub,
.site-header.is-compact .qbar__d { display: none; }
.site-header.is-compact .brand { flex-direction: row; align-items: baseline; gap: 10px; }
.site-header.is-compact .brand__mark { font-size: 20px; }
.site-header.is-compact .brand__name { font-size: 12px; letter-spacing: 0.22em; }
.site-header.is-compact .site-nav__link { padding-top: 9px; padding-bottom: 10px; }
.site-header.is-compact .qbar {
  grid-template-columns: auto auto;
  justify-content: center;
  gap: 10px;
  padding-bottom: 10px;
}
.site-header.is-compact .qbar__act {
  padding: 7px 18px;
  border-radius: 999px;
  background: rgba(20, 26, 69, 0.9);
}

/* ---------- 6. 内容容器与分区 ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
}

.section { padding: clamp(48px, 7vw, 110px) 0; }

.band { padding: clamp(48px, 7vw, 110px) 0; }
.band--indigo { background: linear-gradient(180deg, rgba(20, 26, 69, 0.6), rgba(10, 14, 42, 0)); }
.band--violet { background: linear-gradient(180deg, rgba(108, 76, 255, 0.14), rgba(10, 14, 42, 0)); }
.band--cyan { background: linear-gradient(180deg, rgba(34, 243, 228, 0.10), rgba(10, 14, 42, 0)); }
.band--magenta { background: linear-gradient(180deg, rgba(255, 46, 136, 0.10), rgba(10, 14, 42, 0)); }

.dataline {
  height: 1px;
  border: 0;
  background-image: repeating-linear-gradient(90deg, var(--line-strong) 0 8px, transparent 8px 16px);
}

/* ---------- 7. 网格 ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-full { grid-column: 1 / -1; }

/* ---------- 8. 章节标题 ---------- */
.sec-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 28px;
}

.sec-head__num {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.14em;
  color: var(--violet);
  border: 1px solid rgba(108, 76, 255, 0.45);
  padding: 2px 8px;
}

.sec-head__title { font-size: clamp(24px, 3.2vw, 40px); font-weight: 900; }

.sec-head__note {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 9. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1px solid rgba(34, 243, 228, 0.55);
  background: rgba(34, 243, 228, 0.10);
  color: var(--ice);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.03em;
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
.btn:hover {
  background: rgba(34, 243, 228, 0.20);
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(34, 243, 228, 0.16);
}

.btn--primary {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #04121a;
}
.btn--primary:hover { background: #5cf7ec; }

.btn--magenta {
  border-color: rgba(255, 46, 136, 0.55);
  background: rgba(255, 46, 136, 0.12);
}
.btn--magenta:hover {
  background: rgba(255, 46, 136, 0.22);
  box-shadow: 0 10px 26px rgba(255, 46, 136, 0.18);
}

.btn--ghost {
  border-color: var(--line-strong);
  background: transparent;
  color: var(--mist);
}
.btn--ghost:hover { color: var(--ice); border-color: var(--ice); background: rgba(237, 242, 255, 0.05); }

.btn--sm { padding: 8px 16px; font-size: 13px; }

/* ---------- 10. 标签与状态 ---------- */
.label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 3px 10px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.08em;
  border: 1px solid rgba(34, 243, 228, 0.5);
  background: rgba(34, 243, 228, 0.07);
  color: var(--cyan);
}
.label--magenta { border-color: rgba(255, 46, 136, 0.5); background: rgba(255, 46, 136, 0.09); color: var(--magenta); }
.label--amber { border-color: rgba(255, 176, 32, 0.5); background: rgba(255, 176, 32, 0.10); color: var(--amber); }
.label--green { border-color: rgba(61, 220, 151, 0.5); background: rgba(61, 220, 151, 0.10); color: var(--green); }

.tag {
  display: inline-block;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  border: 1px solid var(--line);
  color: var(--mist);
}

/* ---------- 11. 面包屑 ---------- */
.crumbs {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px var(--pad-x) 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}
.crumbs a { color: var(--mist); border-bottom: 1px dotted transparent; transition: color 0.2s ease, border-color 0.2s ease; }
.crumbs a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
.crumbs__sep { color: var(--violet); }
.crumbs [aria-current="page"] { color: var(--ice); }

/* ---------- 12. 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(20, 26, 69, 0.92), rgba(10, 14, 42, 0.92));
  box-shadow: var(--shadow-card);
  transition: transform 0.24s ease, border-color 0.24s ease, box-shadow 0.24s ease;
}
.card--lift:hover {
  transform: translateY(-4px);
  border-color: rgba(34, 243, 228, 0.5);
  box-shadow: inset 0 1px 0 rgba(237, 242, 255, 0.08), 0 22px 46px rgba(3, 5, 16, 0.55), var(--glow-cyan);
}
.card--offset { margin-top: clamp(24px, 4vw, 64px); }

/* ---------- 13. 图片容器 ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(135deg, var(--ink-700), var(--ink-900) 72%);
}
.media::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(152, 163, 198, 0.10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(152, 163, 198, 0.10) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.75;
  pointer-events: none;
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 42%, rgba(6, 8, 24, 0.68));
  pointer-events: none;
}
.media img, .media video {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--21x9 { aspect-ratio: 21 / 9; }
.media--tilt { transform: skewY(-2deg); }
.media--tilt img { transform: skewY(2deg) scale(1.04); }

.media__cap {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 14. 数据锚点 ---------- */
.stat { display: grid; gap: 6px; }
.stat__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4vw, 52px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}
.stat__label { font-size: 13px; letter-spacing: 0.08em; color: var(--mist); }

/* ---------- 15. 章节目录 ---------- */
.toc {
  position: sticky;
  top: 150px;
  padding: 18px;
  border: 1px solid var(--line);
  background: rgba(20, 26, 69, 0.6);
}
.toc__title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--mist);
}
.toc__list { display: grid; gap: 2px; }
.toc__link {
  display: flex;
  gap: 10px;
  align-items: baseline;
  padding: 7px 8px;
  font-size: 14px;
  color: var(--mist);
  border-left: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}
.toc__link:hover { color: var(--ice); background: rgba(34, 243, 228, 0.06); }
.toc__link[aria-current] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(34, 243, 228, 0.08);
}
.toc__num { font-family: var(--font-mono); font-size: 12px; color: var(--violet); }

/* ---------- 16. 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 70;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(34, 243, 228, 0.5);
  background: rgba(6, 8, 24, 0.88);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 17px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s ease, visibility 0.25s ease, transform 0.25s ease, background 0.25s ease;
}
.to-top.is-on { opacity: 1; visibility: visible; }
.to-top:hover { transform: translateY(-3px); background: rgba(34, 243, 228, 0.16); }

/* ---------- 17. 滚动显现 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s cubic-bezier(0.2, 0.7, 0.3, 1);
}
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- 18. 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
  border-top: 1px solid var(--line);
}

.ft-top {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 56px var(--pad-x) 36px;
  display: grid;
  grid-template-columns: minmax(200px, 1fr) 3fr;
  gap: clamp(24px, 4vw, 56px);
}

.ft-brand { display: grid; gap: 6px; align-content: start; }
.ft-brand__mark {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--cyan);
  text-shadow: var(--glow-cyan);
}
.ft-brand__name { font-size: 16px; font-weight: 800; letter-spacing: 0.28em; }
.ft-brand__desc { font-size: 13px; color: var(--mist); letter-spacing: 0.04em; }
.ft-brand__code {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(152, 163, 198, 0.72);
}

.ft-cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(18px, 2.6vw, 34px);
}

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

.ft-col__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.ft-list { display: grid; gap: 9px; }
.ft-list a {
  font-size: 14px;
  color: var(--mist);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.ft-list a:hover { color: var(--ice); border-bottom-color: var(--cyan); }

.ft-list--plain li {
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  word-break: break-word;
}
.ft-key {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(34, 243, 228, 0.85);
}

.ft-note { margin-top: 12px; font-size: 13px; line-height: 1.7; color: rgba(152, 163, 198, 0.8); }

.ft-legal {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 18px var(--pad-x) 26px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 10px 22px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}
.ft-legal__line { margin: 0; }
.ft-legal__links { margin: 0; }
.ft-legal__links a { color: var(--mist); border-bottom: 1px solid transparent; transition: color 0.2s ease, border-color 0.2s ease; }
.ft-legal__links a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
.ft-legal__sep { margin: 0 6px; color: var(--violet); }

.ft-stream {
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan), var(--violet), var(--magenta), var(--amber), transparent);
  background-size: 200% 100%;
  animation: pg-stream 6s linear infinite;
}
@keyframes pg-stream {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ---------- 19. 平板 ---------- */
@media (max-width: 1100px) {
  .ft-top { grid-template-columns: 1fr; }
  .ft-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
}

@media (max-width: 960px) {
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8 { grid-column: 1 / -1; }
  .toc { position: static; top: auto; }
}

/* ---------- 20. 手机 ---------- */
@media (max-width: 860px) {
  .mast-wrap { grid-template-columns: 1fr; padding-bottom: 12px; }
  .mast-data { display: none; }
  .brand { padding: 0; }

  .nav-toggle { display: flex; }

  .site-nav { display: none; border-top: 1px solid var(--line); }
  .site-nav[data-open="true"] {
    display: block;
    animation: nav-drop 0.26s ease both;
  }
  .site-nav__list {
    justify-content: flex-start;
    flex-wrap: nowrap;
    gap: 8px;
    padding: 10px var(--pad-x) 14px;
    scroll-snap-type: x proximity;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-x: contain;
  }
  .site-nav__item { scroll-snap-align: start; }
  .site-nav__link {
    padding: 10px 14px;
    border: 1px solid var(--line);
    background: rgba(20, 26, 69, 0.6);
  }
  .site-nav__link::before { display: none; }
  .site-nav__link::after { bottom: 0; }

  .qbar { padding-bottom: 12px; gap: 8px; }
  .qbar__act { padding: 10px 12px; gap: 8px; }
  .qbar__d { display: none; }
  .qbar__t { font-size: 14px; }

  .site-header.is-compact .qbar { grid-template-columns: 1fr 1fr; justify-content: stretch; }
  .site-header.is-compact .qbar__act { border-radius: 10px; padding: 8px 12px; }
}

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

@media (max-width: 560px) {
  body { font-size: 16px; }
  .qbar { grid-template-columns: 1fr; }
  .qbar__k { display: none; }
  .ft-cols { grid-template-columns: 1fr; }
  .ft-legal { font-size: 11px; letter-spacing: 0.04em; }
}

/* ---------- 21. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  html { scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
  .ft-stream { background-position: 50% 0; }
}