/* ============================================================
   腾达会真人娱 · 共享样式表 /assets/site.css
   深墨蓝蓝图网格 + 青玉记录线 + 朱砂行动点 + 鎏金索引
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 140px;
}

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

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

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

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

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

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

/* ---------- 2. 设计令牌 ---------- */
:root {
  /* 色彩体系 */
  --ink: #0E1726;
  --ink-panel: #16233A;
  --ink-panel-hi: #1B2B45;
  --rule: #2A3C5A;
  --jade: #3FBFAF;
  --jade-deep: #1E6F6A;
  --cinnabar: #C8402F;
  --cinnabar-lit: #E4634F;
  --gold: #D9A84A;
  --paper: #F3EFE7;
  --muted: #A7B3C6;
  --panel-light: #E8ECF2;

  /* 字体 */
  --font-display: "Songti SC", "Source Han Serif SC", "Noto Serif SC", "STSong", "SimSun", serif;
  --font-body: "PingFang SC", "Source Han Sans SC", "Hiragino Sans GB", "Microsoft YaHei", "Heiti SC", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 尺寸与节奏 */
  --shell-w: 1200px;
  --gutter: clamp(16px, 4vw, 40px);
  --gap: clamp(16px, 2.4vw, 28px);
  --shadow-brut: 5px 5px 0 rgba(0, 0, 0, 0.38);
  --dur: 0.2s;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, rgba(42, 60, 90, 0.16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 60, 90, 0.16) 1px, transparent 1px);
  background-size: 72px 72px;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.85;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--paper);
}

h1 { font-size: clamp(30px, 4.6vw, 56px); }
h2 { font-size: clamp(24px, 3vw, 40px); }
h3 { font-size: clamp(19px, 1.9vw, 24px); }
h4 { font-size: 17px; }

p { max-width: 68ch; }

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

.mono {
  font-family: var(--font-mono);
  font-size: 0.86em;
  letter-spacing: 0.04em;
}

.lede {
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.95;
  color: var(--paper);
  max-width: 60ch;
}

.text-muted { color: var(--muted); }
.text-jade { color: var(--jade); }
.text-gold { color: var(--gold); }
.text-cinnabar { color: var(--cinnabar-lit); }

.rule {
  border: 0;
  border-top: 1px solid var(--rule);
  margin-block: clamp(20px, 3vw, 32px);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--stack-gap, 16px);
}

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

::selection { background: var(--cinnabar); color: var(--paper); }

/* ---------- 4. 布局基元 ---------- */
main { display: block; }
#main-content { display: block; }

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

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}

.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

.section { padding-block: clamp(36px, 6vw, 72px); }

.section + .section { border-top: 1px solid rgba(42, 60, 90, 0.55); }

.section-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px 16px;
  align-items: baseline;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.section-head__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
  padding: 4px 9px;
  border: 1px solid var(--rule);
  background: rgba(22, 35, 58, 0.6);
  white-space: nowrap;
}

.section-head__title { font-size: clamp(22px, 2.6vw, 34px); }

.section-head__note {
  grid-column: 2;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 56ch;
}

/* ---------- 5. 按钮 / 标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border: 2px solid var(--rule);
  background: var(--ink-panel);
  color: var(--paper);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.03em;
  box-shadow: var(--shadow-brut);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
              background var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 rgba(0, 0, 0, 0.42);
}

.btn:active {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 rgba(0, 0, 0, 0.35);
}

.btn--primary {
  background: var(--cinnabar);
  border-color: var(--cinnabar-lit);
  color: var(--paper);
}

.btn--primary:hover { background: var(--cinnabar-lit); }

.btn--jade {
  background: var(--jade);
  border-color: var(--jade-deep);
  color: var(--ink);
}

.btn--jade:hover { background: var(--jade-deep); color: var(--paper); }

.btn--ghost {
  background: transparent;
  border-color: var(--muted);
  color: var(--paper);
  box-shadow: none;
}

.btn--ghost:hover {
  transform: none;
  box-shadow: none;
  border-color: var(--gold);
  color: var(--gold);
  background: rgba(217, 168, 74, 0.08);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1px solid var(--rule);
  background: rgba(22, 35, 58, 0.7);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
  white-space: nowrap;
}

.tag--jade { border-color: var(--jade-deep); color: var(--jade); background: rgba(63, 191, 175, 0.1); }
.tag--gold { border-color: rgba(217, 168, 74, 0.65); color: var(--gold); background: rgba(217, 168, 74, 0.1); }
.tag--cinnabar { border-color: var(--cinnabar-lit); color: var(--cinnabar-lit); background: rgba(200, 64, 47, 0.12); }

/* ---------- 6. 卡片 / 展签 / 图片容器 ---------- */
.card {
  position: relative;
  border: 1px solid var(--rule);
  background: var(--ink-panel);
  padding: clamp(16px, 2vw, 24px);
}

.card--raised {
  border: 2px solid var(--paper);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.4);
}

.card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--rule);
}

.card__title {
  font-family: var(--font-display);
  font-size: 19px;
  color: var(--paper);
}

.card__body { font-size: 15px; color: var(--muted); }
.card__body p { max-width: 60ch; }

.plate {
  display: grid;
  gap: 5px;
  padding: 12px 14px;
  border-left: 3px solid var(--gold);
  background: rgba(22, 35, 58, 0.85);
}

.plate__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.plate__title { font-size: 15px; font-weight: 600; color: var(--paper); }

.plate__text { font-size: 13px; line-height: 1.75; color: var(--muted); }

.figure-frame {
  position: relative;
  display: block;
  border: 1px solid var(--rule);
  background: var(--ink-panel);
  overflow: hidden;
}

.figure-frame__media {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background-color: var(--ink-panel-hi);
  background-image:
    linear-gradient(135deg, rgba(63, 191, 175, 0.16), rgba(200, 64, 47, 0.18)),
    linear-gradient(to right, rgba(42, 60, 90, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 60, 90, 0.5) 1px, transparent 1px);
  background-size: auto, 32px 32px, 32px 32px;
}

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

.figure-frame__caption {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 10px 12px;
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

/* ---------- 7. 面包屑 ---------- */
.breadcrumb {
  padding-block: 14px;
  border-bottom: 1px solid rgba(42, 60, 90, 0.5);
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.breadcrumb__item { display: flex; align-items: center; gap: 8px; }

.breadcrumb__link { color: var(--muted); transition: color var(--dur) var(--ease); }
.breadcrumb__link:hover { color: var(--jade); }

.breadcrumb__sep { color: rgba(167, 179, 198, 0.5); }

.breadcrumb__current { color: var(--gold); }

/* ---------- 8. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--gold);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  border: 2px solid var(--ink);
  transform: translateY(-200%);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus { transform: translateY(0); }

/* ---------- 9. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(14, 23, 38, 0.97);
  border-bottom: 1px solid var(--rule);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.masthead {
  position: relative;
  width: 100%;
  max-width: var(--shell-w);
  margin-inline: auto;
}

.masthead__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 7px var(--gutter);
  border-bottom: 1px solid rgba(42, 60, 90, 0.6);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.masthead__brandline {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: none;
  min-width: 0;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.masthead__region {
  flex: 0 0 auto;
  padding: 1px 8px;
  border: 1px solid var(--jade-deep);
  color: var(--jade);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.utility-nav { flex: 0 0 auto; }

.utility-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 20px);
}

.utility-nav__item { display: flex; }

.utility-nav__link {
  position: relative;
  padding: 2px 0;
  color: var(--muted);
  transition: color var(--dur) var(--ease);
}

.utility-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--jade);
  transition: right var(--dur) var(--ease);
}

.utility-nav__link:hover { color: var(--paper); }
.utility-nav__link:hover::after { right: 0; }
.utility-nav__link--filing { color: var(--gold); }

.masthead__main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px var(--gutter);
}

.brandmark {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 0 0 auto;
}

.brandmark__name {
  display: flex;
  align-items: center;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.brandmark__name::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 9px;
  background: var(--cinnabar);
}

.brandmark__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.masthead__rail {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 24px);
  margin-left: auto;
  min-width: 0;
}

.masthead__section {
  display: none;
  max-width: none;
  padding: 3px 10px;
  border: 1px solid var(--jade-deep);
  background: rgba(63, 191, 175, 0.09);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--jade);
  white-space: nowrap;
}

.masthead__section:empty { display: none; }

.site-header.is-condensed .masthead__section:not(:empty) { display: inline-block; }

.site-nav { display: flex; }

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 26px);
  counter-reset: navIdx;
}

.site-nav__item { display: flex; }

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 2px;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--paper);
  border-bottom: 2px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.site-nav__link::before {
  counter-increment: navIdx;
  content: "0" counter(navIdx);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--gold);
  opacity: 0.7;
}

.site-nav__link:hover { color: var(--gold); border-bottom-color: var(--gold); }

.site-nav__link[aria-current="page"] {
  color: var(--paper);
  border-bottom-color: var(--cinnabar);
}

.site-nav__link.is-active { color: var(--jade); }
.site-nav__link.is-active::before { color: var(--jade); opacity: 1; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  border: 1px solid var(--rule);
  background: var(--ink-panel);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  box-shadow: 3px 3px 0 rgba(0, 0, 0, 0.35);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.nav-toggle__bar {
  position: relative;
  width: 20px;
  height: 2px;
  background: var(--paper);
  transition: background var(--dur) var(--ease);
}

.nav-toggle__bar::before,
.nav-toggle__bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 20px;
  height: 2px;
  background: var(--paper);
  transition: transform var(--dur) var(--ease);
}

.nav-toggle__bar::before { top: -6px; }
.nav-toggle__bar::after { top: 6px; }

.nav-toggle[aria-expanded="true"] { border-color: var(--cinnabar); color: var(--gold); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar::after { transform: translateY(-6px) rotate(-45deg); }

.site-header.is-condensed .masthead__top { display: none; }
.site-header.is-condensed .masthead__main { padding-block: 8px; }

.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 3px;
  background: rgba(42, 60, 90, 0.7);
}

.read-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--jade) 0%, var(--gold) 58%, var(--cinnabar) 100%);
  transition: transform 0.12s linear;
}

/* ---------- 10. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(40px, 6vw, 80px);
  background: var(--ink-panel);
  background-image:
    linear-gradient(to right, rgba(42, 60, 90, 0.28) 1px, transparent 1px);
  background-size: 72px 100%;
  border-top: 3px solid var(--rule);
  color: var(--muted);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  width: 132px;
  height: 3px;
  background: var(--cinnabar);
}

.footer__inner { padding-block: clamp(32px, 5vw, 56px) 20px; }

.footer__grid {
  display: grid;
  grid-template-columns: 4fr 8fr;
  gap: clamp(24px, 4vw, 48px);
  padding-bottom: 28px;
  border-bottom: 1px solid var(--rule);
}

.footer__eyebrow {
  max-width: none;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.footer__title {
  font-family: var(--font-display);
  font-size: clamp(20px, 2.2vw, 26px);
  line-height: 1.55;
  color: var(--paper);
  max-width: 20ch;
}

.footer__note { margin-top: 12px; font-size: 14px; max-width: 34ch; }

.footer__index {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 32px);
}

.footer__group-title {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.footer__group-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.footer__list { display: flex; flex-direction: column; gap: 8px; }

.footer__link {
  display: inline-block;
  font-size: 14px;
  color: var(--muted);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.footer__link:hover { color: var(--jade); transform: translateX(3px); }

.footer__contact {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.8fr;
  gap: 18px 24px;
  padding-block: 26px;
  border-bottom: 1px solid var(--rule);
}

.footer__contact-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.footer__contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.footer__contact-value {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--paper);
  word-break: break-word;
}

.copy-btn {
  align-self: flex-start;
  margin-top: 4px;
  padding: 5px 12px;
  border: 1px solid var(--jade-deep);
  background: transparent;
  color: var(--jade);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}

.copy-btn:hover { background: rgba(63, 191, 175, 0.14); }

.copy-btn.is-copied {
  border-color: var(--gold);
  background: var(--gold);
  color: var(--ink);
}

.footer__legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  padding-top: 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--muted);
}

.footer__legal-line { max-width: none; }
.footer__legal-line--mono { opacity: 0.78; }

/* ---------- 11. 动效协议 ---------- */
html.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
}

[data-reveal] {
  transition: opacity 0.26s ease-out, transform 0.26s ease-out;
}

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

/* ---------- 12. 响应式 ---------- */
@media (max-width: 1100px) {
  .footer__contact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 899px) {
  html { scroll-padding-top: 96px; }

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

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: block;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    background: var(--ink-panel);
    border-bottom: 2px solid var(--cinnabar);
    box-shadow: 0 18px 30px rgba(0, 0, 0, 0.45);
    transition: max-height 0.26s var(--ease), visibility 0.26s linear;
  }

  .site-nav[data-open] {
    max-height: 78vh;
    overflow-y: auto;
    visibility: visible;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 0;
  }

  .site-nav__item { display: block; }

  .site-nav__link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px var(--gutter);
    font-size: 16px;
    border-bottom: 1px solid rgba(42, 60, 90, 0.5);
  }

  .site-nav__link::before { font-size: 11px; }

  .site-nav__link[aria-current="page"] {
    background: rgba(200, 64, 47, 0.12);
    border-bottom-color: rgba(42, 60, 90, 0.5);
    box-shadow: inset 3px 0 0 var(--cinnabar);
  }

  .site-nav__link.is-active { box-shadow: inset 3px 0 0 var(--jade); }

  .masthead__section { display: none !important; }

  .masthead__main { padding: 10px var(--gutter); }

  .brandmark__name { font-size: 18px; }

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

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

  .span-3, .span-4, .span-5 { grid-column: span 6; }
  .span-7, .span-8 { grid-column: span 12; }
}

@media (max-width: 860px) {
  .utility-nav { display: none; }
  .masthead__top { justify-content: flex-start; }
}

@media (max-width: 620px) {
  body { font-size: 15.5px; line-height: 1.8; }

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

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

  .span-3, .span-4, .span-5, .span-6 { grid-column: span 12; }

  .section-head { grid-template-columns: 1fr; }
  .section-head__note { grid-column: 1; }

  .btn { width: 100%; justify-content: center; }
}

/* ---------- 13. 无障碍与低动效 ---------- */
@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;
  }

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

  .read-progress__bar { transition: none; }
}