/* ============================================================
   99真人 · 全站共享外壳与基础组件
   夜间大屏指挥舱 × 复古编辑出版
   ============================================================ */

/* ---------- tokens ---------- */
:root {
  --ink: #0B0E11;
  --ink-soft: #12181E;
  --ink-line: #1E262E;
  --gold: #E8B45A;
  --gold-soft: #F2C87C;
  --gold-deep: #7A5C2E;
  --cream: #F4EBDD;
  --brown: #261A12;
  --cyan: #5CE1E6;
  --coral: #FF7A59;
  --slate: #8A9BAE;
  --green: #63D18B;
  --glass: rgba(255, 255, 255, 0.08);

  --font-display: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --gutter: clamp(16px, 4vw, 44px);
  --gap: clamp(14px, 2vw, 26px);
  --maxw: 1320px;
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --radius: 2px;
}

/* ---------- 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, fieldset {
  margin: 0;
}

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

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

a { color: inherit; }

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

[hidden] { display: none !important; }

::selection {
  background: var(--gold);
  color: #150F07;
}

/* ---------- base typography ---------- */
body {
  min-height: 100vh;
  background:
    radial-gradient(140% 80% at 92% -12%, rgba(232, 180, 90, 0.10), transparent 58%),
    radial-gradient(120% 70% at -12% 22%, rgba(92, 225, 230, 0.07), transparent 60%),
    var(--ink);
  color: var(--cream);
  font-family: var(--font-body);
  font-size: clamp(15.5px, 1.05vw, 17px);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.1rem, 5.4vw, 4.2rem); }
h2 { font-size: clamp(1.5rem, 2.8vw, 2.4rem); }
h3 { font-size: clamp(1.12rem, 1.8vw, 1.4rem); }

p { text-wrap: pretty; }

strong { font-weight: 800; color: var(--gold); }

code, kbd, samp, pre { font-family: var(--font-mono); }

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

.paper :focus-visible { outline-color: #0E7C82; }

/* ---------- skip link ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 0.62rem 1.05rem;
  background: var(--gold);
  color: #150F07;
  font-weight: 800;
  font-size: 0.86rem;
  letter-spacing: 0.06em;
  text-decoration: none;
  border-radius: var(--radius);
  transform: translateY(-180%);
  transition: transform 0.22s var(--ease);
}

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

/* ============================================================
   头部
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(11, 14, 17, 0.94);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(122, 92, 46, 0.55);
  color: var(--cream);
}

.header-shell {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  column-gap: clamp(12px, 2vw, 28px);
  align-items: stretch;
  width: min(100% - 2 * var(--gutter), var(--maxw));
  margin-inline: auto;
}

/* 左侧品牌轨道 */
.brand-mark {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.22rem;
  padding: 14px 14px 14px 0;
  border-right: 1px solid rgba(122, 92, 46, 0.42);
  text-decoration: none;
  color: var(--cream);
}

.brand-mark__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.7rem;
  line-height: 0.9;
  letter-spacing: -0.06em;
  color: var(--gold);
  transition: color 0.2s var(--ease);
}

.brand-mark__name {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.42em;
  color: var(--cream);
}

.brand-mark__meta {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  color: var(--slate);
  white-space: nowrap;
}

.brand-mark:hover .brand-mark__num { color: var(--gold-soft); }

.header-body {
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* 上层：品牌说明 + 动作 */
.header-topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(8px, 1.6vw, 20px);
  padding: 9px 0;
  border-bottom: 1px solid rgba(122, 92, 46, 0.28);
}

.header-brandline {
  flex: 1 1 auto;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--slate);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-brandline::before {
  content: "";
  flex: none;
  width: 22px;
  height: 2px;
  background: var(--gold);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: none;
}

/* 移动按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.42rem 0.7rem;
  border: 1px solid rgba(232, 180, 90, 0.45);
  border-radius: var(--radius);
  color: var(--gold);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
}

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.site-header[data-open] .nav-toggle__bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle__bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 下层：栏目带 */
.site-nav { padding-top: 1px; }

.site-nav__list {
  display: flex;
  align-items: stretch;
  flex-wrap: nowrap;
  gap: clamp(2px, 1.5vw, 24px);
}

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.42em;
  padding: 0.74rem 2px;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: rgba(244, 235, 221, 0.76);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.26s var(--ease);
}

.site-nav__link:hover,
.site-nav__link:focus-visible { color: var(--cream); }
.site-nav__link:hover::after { transform: scaleX(1); }

.site-nav__idx {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.06em;
  color: var(--gold-deep);
  transition: color 0.2s var(--ease);
}

.site-nav__link[aria-current="page"] { color: var(--gold); }
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: linear-gradient(90deg, var(--gold), var(--coral));
}
.site-nav__link[aria-current="page"] .site-nav__idx { color: var(--cyan); }

/* 顶部进度光栅 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--coral) 55%, var(--cyan));
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(232, 180, 90, 0.08), transparent 62%),
    var(--ink);
  color: var(--cream);
  padding-top: clamp(30px, 5vw, 58px);
}

.site-footer::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: 0.75;
}

.footer-shell {
  display: grid;
  grid-template-columns: 1.1fr 0.8fr 1.3fr;
  gap: clamp(22px, 3.4vw, 52px);
  width: min(100% - 2 * var(--gutter), var(--maxw));
  margin-inline: auto;
  padding-bottom: clamp(24px, 3vw, 40px);
}

.footer-brand__mark {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--gold);
}

.footer-brand__desc {
  margin-top: 0.55rem;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  color: rgba(244, 235, 221, 0.82);
}

.footer-brand__note {
  margin-top: 0.85rem;
  max-width: 30ch;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--slate);
}

.footer-nav__title,
.footer-contact__title {
  margin-bottom: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  color: var(--gold);
}

.footer-nav__list {
  display: grid;
  gap: 0.55rem;
}

.footer-nav__list a {
  display: inline-block;
  font-size: 0.9rem;
  color: rgba(244, 235, 221, 0.78);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.footer-nav__list a:hover,
.footer-nav__list a:focus-visible {
  color: var(--gold);
  border-bottom-color: var(--gold-deep);
}

.footer-contact__list {
  display: grid;
  gap: 0.6rem;
  font-size: 0.86rem;
  line-height: 1.6;
}

.footer-contact__list li { display: flex; flex-wrap: wrap; align-items: baseline; gap: 0.1rem 0; }

.footer-contact__label {
  flex: none;
  min-width: 2.8em;
  margin-right: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.footer-contact__value {
  font-family: var(--font-mono);
  font-size: 0.84rem;
  color: var(--cream);
  word-break: break-all;
}

.copy-btn {
  margin-left: 0.5rem;
  padding: 0.1rem 0.5rem;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
  border: 1px solid rgba(92, 225, 230, 0.4);
  border-radius: var(--radius);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.copy-btn:hover,
.copy-btn:focus-visible {
  background: rgba(92, 225, 230, 0.14);
  border-color: var(--cyan);
}

.copy-btn[data-copy-state="done"] {
  color: var(--green);
  border-color: rgba(99, 209, 139, 0.55);
  background: rgba(99, 209, 139, 0.12);
}

.copy-btn[data-copy-state="fail"] {
  color: var(--coral);
  border-color: rgba(255, 122, 89, 0.55);
  background: rgba(255, 122, 89, 0.12);
}

.footer-contact__meta {
  margin-top: 0.75rem;
  font-size: 0.74rem;
  color: var(--slate);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55rem 1.4rem;
  width: min(100% - 2 * var(--gutter), var(--maxw));
  margin-inline: auto;
  padding: 1rem 0 1.5rem;
  border-top: 1px solid rgba(122, 92, 46, 0.35);
  font-size: 0.76rem;
  color: var(--slate);
}

.footer-base__copy,
.footer-base__icp {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.to-top {
  margin-left: auto;
  padding: 0.44rem 0.9rem;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--gold);
  border: 1px solid rgba(232, 180, 90, 0.45);
  border-radius: var(--radius);
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.to-top:hover,
.to-top:focus-visible {
  background: rgba(232, 180, 90, 0.14);
  color: var(--gold-soft);
}

/* ============================================================
   通用版式与基础组件
   ============================================================ */
.container {
  width: min(100% - 2 * var(--gutter), var(--maxw));
  margin-inline: auto;
}

.section { padding-block: clamp(30px, 5vw, 72px); }

.grid-12 {
  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-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45em;
  padding: 0.62rem 1.1rem;
  font-size: 0.86rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1.3;
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.btn--sm { padding: 0.4rem 0.8rem; font-size: 0.78rem; }

.btn--solid {
  background: var(--gold);
  color: #150F07;
  border-color: var(--gold);
}

.btn--solid:hover,
.btn--solid:focus-visible { background: var(--gold-soft); border-color: var(--gold-soft); }

.btn--ghost {
  background: transparent;
  color: var(--gold);
  border-color: rgba(232, 180, 90, 0.45);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: rgba(232, 180, 90, 0.13);
  border-color: var(--gold);
  color: var(--gold-soft);
}

.btn--coral {
  background: transparent;
  color: var(--coral);
  border-color: rgba(255, 122, 89, 0.5);
}

.btn--coral:hover,
.btn--coral:focus-visible { background: rgba(255, 122, 89, 0.14); }

/* 展签标签 */
.spec-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  padding: 0.26rem 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  color: var(--gold);
  background: rgba(232, 180, 90, 0.08);
  border: 1px solid rgba(232, 180, 90, 0.45);
  border-radius: var(--radius);
}

.spec-tag--cyan {
  color: var(--cyan);
  background: rgba(92, 225, 230, 0.1);
  border-color: rgba(92, 225, 230, 0.4);
}

.spec-tag--coral {
  color: var(--coral);
  background: rgba(255, 122, 89, 0.1);
  border-color: rgba(255, 122, 89, 0.42);
}

/* 状态胶囊 */
.status {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.2rem 0.62rem;
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  border-radius: 999px;
  color: var(--cyan);
  background: rgba(92, 225, 230, 0.12);
  border: 1px solid rgba(92, 225, 230, 0.35);
  white-space: nowrap;
}

.status::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  flex: none;
}

.status--rule {
  color: var(--coral);
  background: rgba(255, 122, 89, 0.12);
  border-color: rgba(255, 122, 89, 0.38);
}

.status--done {
  color: var(--green);
  background: rgba(99, 209, 139, 0.12);
  border-color: rgba(99, 209, 139, 0.38);
}

/* 大数字 / 期号 */
.display-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.6rem, 7vw, 6rem);
  line-height: 0.88;
  letter-spacing: -0.05em;
  color: var(--gold);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.28em;
  color: var(--slate);
}

.side-note {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.4em;
  color: var(--slate);
}

/* 玻璃层与纸面层 */
.plate {
  position: relative;
  padding: clamp(16px, 2.2vw, 28px);
  background: var(--glass);
  border: 1px solid rgba(122, 92, 46, 0.5);
  border-radius: var(--radius);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.plate--flush { padding: 0; overflow: hidden; }

.paper {
  padding: clamp(18px, 2.6vw, 34px);
  background: var(--cream);
  color: var(--brown);
  border-radius: var(--radius);
}

.paper h2,
.paper h3,
.paper h4 { color: var(--brown); }

.paper a { color: #7A4A12; }

.paper strong { color: #8A4A12; }

/* 章节头与分隔 */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  margin-bottom: clamp(14px, 2vw, 24px);
}

.section-head p {
  font-size: 0.88rem;
  color: var(--slate);
}

.divider {
  height: 1px;
  margin-block: clamp(20px, 3vw, 38px);
  border: 0;
  background: linear-gradient(90deg, var(--gold-deep), rgba(122, 92, 46, 0) 85%);
}

/* 面包屑 */
.breadcrumbs { font-size: 0.78rem; color: var(--slate); }

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
}

.breadcrumbs li { display: inline-flex; align-items: center; }

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 0.45rem;
  color: var(--gold-deep);
}

.breadcrumbs a {
  color: var(--slate);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.breadcrumbs a:hover,
.breadcrumbs a:focus-visible { color: var(--gold); }

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

/* 长文排版 */
.prose {
  font-size: clamp(15.5px, 1.05vw, 17px);
  line-height: 1.8;
}

.prose > * + * { margin-top: 0.9em; }
.prose h2 { margin-top: 1.6em; font-size: clamp(1.3rem, 2.2vw, 1.8rem); }
.prose h3 { margin-top: 1.4em; font-size: 1.12rem; }

.prose ul { display: grid; gap: 0.5rem; }

.prose ul li { position: relative; padding-left: 1.1em; }

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 6px;
  background: var(--gold);
}

.prose ol {
  display: grid;
  gap: 0.5rem;
  list-style: decimal;
  padding-left: 1.4em;
}

.prose a {
  color: var(--gold);
  text-decoration: underline;
  text-underline-offset: 0.22em;
}

.paper .prose a { color: #7A4A12; }

/* 图片容器基础规则 */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid rgba(122, 92, 46, 0.5);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 100% at 0% 0%, rgba(92, 225, 230, 0.18), transparent 55%),
    radial-gradient(120% 100% at 100% 100%, rgba(255, 122, 89, 0.16), transparent 55%),
    linear-gradient(160deg, #141A20, #0B0E11);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(0deg, rgba(232, 180, 90, 0.10) 0 1px, transparent 1px 34px),
    repeating-linear-gradient(90deg, rgba(232, 180, 90, 0.10) 0 1px, transparent 1px 34px);
  opacity: 0.55;
}

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

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

.media-frame__label {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 1;
  padding: 0.4rem 0.7rem;
  background: rgba(11, 14, 17, 0.82);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.16em;
}

/* 滚动显现 */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

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

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1080px) {
  .header-shell { grid-template-columns: 82px minmax(0, 1fr); }
  .brand-mark__num { font-size: 1.45rem; }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 108px; }

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

  .brand-mark {
    flex-direction: row;
    align-items: baseline;
    gap: 0.5rem;
    padding: 10px 0;
    border-right: 0;
    border-bottom: 1px solid rgba(122, 92, 46, 0.3);
  }

  .brand-mark__num { font-size: 1.35rem; }
  .brand-mark__meta { margin-left: auto; }

  .header-topline { padding: 7px 0; gap: 0.6rem; }
  .header-brandline { font-size: 0.68rem; letter-spacing: 0.14em; }

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

  .site-nav { display: none; }

  .site-header[data-open] .site-nav {
    display: block;
    border-top: 1px solid rgba(232, 180, 90, 0.2);
    padding-bottom: 8px;
  }

  .site-nav__list {
    flex-direction: column;
    gap: 0;
    padding-top: 4px;
  }

  .site-nav__item + .site-nav__item { border-top: 1px solid rgba(122, 92, 46, 0.24); }

  .site-nav__link {
    width: 100%;
    padding: 0.8rem 2px;
    font-size: 1rem;
  }

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

  .site-nav__link[aria-current="page"] {
    color: var(--gold);
    background: linear-gradient(90deg, rgba(232, 180, 90, 0.12), transparent 70%);
  }

  .is-nav-open { overflow: hidden; }

  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }

  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9 { grid-column: span 6; }
  .col-12 { grid-column: span 6; }

  .footer-shell { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .header-brandline { display: none; }
  .header-topline { justify-content: space-between; }
  .header-actions .btn--ghost { display: none; }

  .grid-12 { grid-template-columns: minmax(0, 1fr); }
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9, .col-12 { grid-column: span 1; }

  .footer-shell { grid-template-columns: minmax(0, 1fr); gap: 26px; }

  .footer-base { font-size: 0.72rem; }
  .to-top { margin-left: 0; }
}

/* ============================================================
   减少动效
   ============================================================ */
@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;
    scroll-behavior: auto !important;
  }

  .skip-link { transition: none; }

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