/* ============================================================
   多玩服务 · /assets/site.css
   共享层：reset / 变量 / 中文排版 / 双层头部 / 页脚 / 通用组件
   ============================================================ */

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

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

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

ul, ol { list-style: none; }

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

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

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

input, textarea, select { font: inherit; }

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

hr { border: 0; }

/* ---------- 2. 变量 ---------- */
:root {
  --navy: #1D4E89;
  --navy-deep: #12345B;
  --orange: #E8702A;
  --orange-dark: #CE5E1C;
  --orange-soft: #F4A261;
  --cream: #F7F1E3;
  --mint: #DDE7DC;
  --sage: #5A7D6B;
  --ink: #2B2118;
  --danger: #C44536;
  --glass: rgba(255, 255, 255, 0.86);
  --line: rgba(29, 78, 137, 0.18);
  --line-soft: rgba(43, 33, 24, 0.12);

  --shell-w: 1180px;
  --shell-w-wide: 1320px;
  --pad: clamp(1rem, 4vw, 3.25rem);
  --radius: 4px;

  --serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --shadow-soft: 0 18px 40px -30px rgba(18, 52, 91, 0.55);

  --header-bar-h: 60px;
  --header-nav-h: 50px;
}

/* ---------- 3. 中文排版基底 ---------- */
body {
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--cream);
  background-image: radial-gradient(circle at center, rgba(29, 78, 137, 0.075) 1px, transparent 1.3px);
  background-size: 24px 24px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--navy-deep);
  text-wrap: balance;
}

h1 { font-size: clamp(2.1rem, 4.2vw, 3.35rem); line-height: 1.18; }
h2 { font-size: clamp(1.55rem, 2.6vw, 2.15rem); }
h3 { font-size: clamp(1.12rem, 1.6vw, 1.38rem); }
h4 { font-size: 1rem; }

p { text-wrap: pretty; }

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

::selection {
  background: var(--orange-soft);
  color: var(--navy-deep);
}

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

.site-header__bar :focus-visible,
.site-footer :focus-visible {
  outline-color: var(--orange-soft);
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

/* ---------- 4. 容器 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-w);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.shell--wide { max-width: var(--shell-w-wide); }

/* ---------- 5. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 50%;
  z-index: 200;
  transform: translate(-50%, -180%);
  padding: 0.6rem 1.1rem;
  border-radius: 3px;
  background: var(--navy-deep);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  box-shadow: 0 10px 24px -14px rgba(0, 0, 0, 0.8);
  transition: transform 0.18s var(--ease);
}

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

/* ---------- 6. 双层头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background: var(--cream);
  border-bottom: 1px solid rgba(18, 52, 91, 0.16);
  transition: box-shadow 0.22s var(--ease);
}

.site-header[data-scrolled="true"] {
  box-shadow: 0 14px 30px -26px rgba(18, 52, 91, 0.85);
}

/* 第一层：深海蓝品牌行 */
.site-header__bar {
  background: var(--navy-deep);
  color: var(--cream);
}

.site-header__bar-inner {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-height: var(--header-bar-h);
  padding-block: 0.5rem;
  transition: min-height 0.22s var(--ease);
}

.site-header[data-scrolled="true"] .site-header__bar-inner {
  min-height: 52px;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  flex: 0 0 auto;
  color: inherit;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border-radius: 3px;
  background: var(--orange);
  color: #fff;
  font-family: var(--serif);
  font-size: 1.06rem;
  font-weight: 700;
  line-height: 1;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.28);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand__name {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.07em;
}

.brand__tagline {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: rgba(247, 241, 227, 0.72);
}

.brand__tagline::before {
  content: "";
  width: 14px;
  height: 1px;
  background: var(--orange-soft);
}

/* 双入口 */
.header-cta {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* 第二层：玻璃栏目层 */
.site-header__nav {
  position: relative;
  background: var(--glass);
  -webkit-backdrop-filter: blur(12px) saturate(1.3);
  backdrop-filter: blur(12px) saturate(1.3);
  border-bottom: 1px solid var(--line);
}

.nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.15rem;
  padding-block: 0.36rem;
}

.nav__item { display: flex; }

.nav__link {
  display: inline-block;
  padding: 0.55rem 0.85rem;
  border-radius: 3px;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--navy-deep);
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease);
}

.nav__link:hover {
  background: rgba(29, 78, 137, 0.1);
  color: var(--navy);
}

.nav__link[aria-current="page"] {
  background: var(--navy);
  color: #fff;
}

.nav__link[aria-current="page"]:hover {
  background: var(--navy-deep);
  color: #fff;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  margin-left: 0.25rem;
  padding: 0.5rem 0.7rem;
  border: 1px solid rgba(247, 241, 227, 0.45);
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--cream);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  background: currentColor;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s var(--ease), top 0.2s var(--ease);
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.site-header[data-open="true"] .nav-toggle__bars { background: transparent; }
.site-header[data-open="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

/* 阅读进度线 */
.progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(29, 78, 137, 0.12);
  pointer-events: none;
}

.progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--navy) 0%, var(--orange) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.09s linear;
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.42rem;
  padding: 0.58rem 1.05rem;
  border: 1px solid transparent;
  border-radius: 3px;
  font-family: var(--sans);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.3;
  text-align: center;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease),
              border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

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

.btn--warm {
  background: var(--orange);
  color: #fff8f0;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.14);
}

.btn--warm:hover { background: var(--orange-dark); }

.btn--outline {
  border-color: rgba(247, 241, 227, 0.5);
  color: var(--cream);
}

.btn--outline:hover {
  background: rgba(247, 241, 227, 0.14);
  border-color: rgba(247, 241, 227, 0.82);
}

.btn--navy {
  background: var(--navy);
  color: #fff;
}

.btn--navy:hover { background: var(--navy-deep); }

.btn--line {
  border-color: var(--line);
  background: #fff;
  color: var(--navy);
}

.btn--line:hover {
  border-color: var(--navy);
  background: rgba(29, 78, 137, 0.06);
}

.btn--sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.82rem;
}

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 6rem);
  background: var(--navy-deep);
  color: rgba(247, 241, 227, 0.86);
  font-size: 0.92rem;
}

.site-footer::before {
  content: "";
  display: block;
  height: 5px;
  background: linear-gradient(90deg,
      var(--navy) 0 34%,
      var(--orange) 34% 62%,
      var(--sage) 62% 100%);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 0.75fr 0.85fr 0.65fr 1.4fr;
  gap: clamp(1.25rem, 2.5vw, 2.5rem);
  padding-block: clamp(2.25rem, 5vw, 3.5rem) clamp(1.5rem, 3vw, 2.25rem);
}

.footer-brand__name {
  font-family: var(--serif);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  color: #fff;
}

.footer-brand__tag {
  margin-top: 0.5rem;
  font-size: 0.86rem;
  line-height: 1.65;
  color: rgba(247, 241, 227, 0.72);
}

.footer-brand__stamp {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-top: 0.95rem;
  padding: 0.28rem 0.6rem;
  border: 1px solid rgba(247, 241, 227, 0.28);
  border-radius: 2px;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: rgba(247, 241, 227, 0.8);
}

.footer-brand__stamp::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--orange);
}

.footer-col__title {
  margin-bottom: 0.9rem;
  font-family: var(--sans);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--orange-soft);
  line-height: 1.4;
}

.footer-col__title::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 2px;
  margin-right: 0.5rem;
  vertical-align: middle;
  background: var(--orange-soft);
}

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.footer-list__link {
  display: inline-block;
  padding-bottom: 1px;
  font-size: 0.92rem;
  color: rgba(247, 241, 227, 0.82);
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.footer-list__link:hover {
  color: #fff;
  border-color: var(--orange-soft);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.footer-contact__row {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  font-size: 0.9rem;
}

.footer-contact__label {
  flex: 0 0 2.9em;
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: rgba(247, 241, 227, 0.55);
}

.footer-contact__value {
  color: rgba(247, 241, 227, 0.92);
  word-break: break-word;
}

.footer-note {
  margin-top: 0.35rem;
  font-size: 0.78rem;
  line-height: 1.65;
  color: rgba(247, 241, 227, 0.6);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding-block: 1.1rem;
  border-top: 1px solid rgba(247, 241, 227, 0.16);
  font-size: 0.8rem;
  color: rgba(247, 241, 227, 0.62);
}

.footer-legal { letter-spacing: 0.02em; }

.footer-legal__meta {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
}

/* ---------- 9. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  padding-block: 1.2rem 0.2rem;
  font-size: 0.8rem;
  color: var(--sage);
}

.breadcrumbs__link {
  color: var(--navy);
  border-bottom: 1px solid rgba(29, 78, 137, 0.28);
}

.breadcrumbs__link:hover { border-color: var(--navy); }

.breadcrumbs__sep { color: rgba(43, 33, 24, 0.35); }

.breadcrumbs__current {
  color: var(--ink);
  font-weight: 600;
}

/* ---------- 10. 左右分屏骨架与章节轨 ---------- */
.page-shell {
  display: grid;
  grid-template-columns: minmax(180px, 236px) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  padding-block: clamp(1.25rem, 3vw, 2.25rem) clamp(2.5rem, 6vw, 5rem);
}

.rail {
  position: relative;
  min-width: 0;
}

.rail-nav {
  position: sticky;
  top: calc(var(--header-bar-h) + var(--header-nav-h) + 1.25rem);
}

.rail-nav__link {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  padding: 0.42rem 0 0.42rem 0.75rem;
  border-left: 2px solid transparent;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--ink);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.rail-nav__link:hover { color: var(--navy); }

.rail-nav__link.is-current {
  border-left-color: var(--orange);
  color: var(--navy);
  font-weight: 600;
}

.rail-nav__num {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--sage);
}

.rail-nav__link.is-current .rail-nav__num { color: var(--orange); }

/* ---------- 11. 正文与区块标题 ---------- */
.prose {
  max-width: 38em;
}

.prose p + p { margin-top: 1em; }

.prose ul { list-style: disc; padding-left: 1.3em; margin-block: 0.8em; }
.prose ol { list-style: decimal; padding-left: 1.3em; margin-block: 0.8em; }
.prose li + li { margin-top: 0.35em; }
.prose h2 { margin-block: 1.6em 0.6em; }
.prose h3 { margin-block: 1.4em 0.5em; }

.lede {
  max-width: 36em;
  font-size: clamp(1rem, 1.4vw, 1.12rem);
  line-height: 1.8;
  color: #3b2f24;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--navy);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--orange);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  margin-bottom: 1.2rem;
}

.rule {
  height: 1px;
  border: 0;
  margin-block: clamp(1.5rem, 3vw, 2.5rem);
  background: linear-gradient(90deg, var(--navy) 0 40px, rgba(29, 78, 137, 0.16) 40px 100%);
}

.note {
  padding: 1rem 1.15rem;
  border-left: 3px solid var(--navy);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--mint);
  font-size: 0.94rem;
  line-height: 1.75;
}

.note--warn {
  border-left-color: var(--danger);
  background: rgba(196, 69, 54, 0.09);
}

/* ---------- 12. 网格与卡片 ---------- */
.grid {
  display: grid;
  gap: clamp(1rem, 2vw, 1.5rem);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); }

.card {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  padding: clamp(1rem, 2vw, 1.35rem);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: var(--shadow-soft);
}

.card--mint {
  background: var(--mint);
  border-color: rgba(90, 125, 107, 0.3);
  box-shadow: none;
}

.card__num {
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--navy);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.6rem;
  border: 1px solid rgba(90, 125, 107, 0.28);
  border-radius: 999px;
  background: var(--mint);
  color: #33513f;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.6;
}

.chip--warm {
  border-color: rgba(232, 112, 42, 0.32);
  background: rgba(232, 112, 42, 0.12);
  color: #A84B13;
}

/* ---------- 13. 图片容器基础规则 ---------- */
.figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.figure__frame {
  position: relative;
  aspect-ratio: 16 / 10;
  background-color: var(--mint);
  background-image:
    linear-gradient(rgba(90, 125, 107, 0.16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(90, 125, 107, 0.16) 1px, transparent 1px);
  background-size: 28px 28px;
}

.figure__frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.figure__frame[data-label]::after {
  content: attr(data-label);
  position: absolute;
  left: 0.75rem;
  bottom: 0.7rem;
  padding: 0.15rem 0.5rem;
  border: 1px solid rgba(90, 125, 107, 0.35);
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.88);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: #3f5a4c;
}

.figure__cap {
  padding: 0.7rem 0.9rem;
  border-top: 1px solid var(--line);
  background: #fffdf8;
  font-size: 0.8rem;
  line-height: 1.65;
  color: #5c5347;
}

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

/* ---------- 14. 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 0.85rem;
  border-radius: 3px;
  background: var(--navy);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  box-shadow: 0 14px 26px -16px rgba(18, 52, 91, 0.9);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s var(--ease);
}

.to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.to-top:hover { background: var(--navy-deep); }

/* ---------- 15. 锚点落位与主内容 ---------- */
#main-content { display: block; }

[data-chapter] { scroll-margin-top: calc(var(--header-bar-h) + var(--header-nav-h) + 1.25rem); }

/* ---------- 16. 平板 ---------- */
@media (max-width: 1024px) {
  .page-shell {
    grid-template-columns: minmax(0, 1fr);
  }

  .rail-nav { position: static; }

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

  .footer-brand,
  .footer-contact { grid-column: 1 / -1; }
}

/* ---------- 17. 移动导航与手机 ---------- */
@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }

  .brand__tagline { display: none; }

  .site-header__nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    background: rgba(255, 255, 255, 0.98);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 24px 40px -30px rgba(18, 52, 91, 0.75);
    transition: max-height 0.28s var(--ease), visibility 0.28s var(--ease);
  }

  .site-header[data-open="true"] .site-header__nav {
    max-height: min(70vh, 520px);
    overflow-y: auto;
    visibility: visible;
  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0.1rem;
    padding-block: 0.5rem 1rem;
  }

  .nav__link {
    display: block;
    padding: 0.78rem 0.9rem;
    border-bottom: 1px solid rgba(29, 78, 137, 0.1);
    border-radius: 3px;
    font-size: 0.96rem;
  }

  .page-shell {
    padding-block: 1rem clamp(2.25rem, 6vw, 4rem);
  }
}

@media (max-width: 700px) {
  body { font-size: 16px; }

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

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

  .footer-brand,
  .footer-contact { grid-column: auto; }

  .header-cta { gap: 0.35rem; }

  .btn { padding: 0.52rem 0.8rem; font-size: 0.86rem; }

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

@media (max-width: 560px) {
  .site-header__bar-inner { gap: 0.45rem; }

  .brand { gap: 0.5rem; }

  .brand__mark { width: 30px; height: 30px; font-size: 0.95rem; }

  .brand__name { font-size: 0.98rem; letter-spacing: 0.04em; }

  .header-cta .btn { padding: 0.42rem 0.55rem; font-size: 0.78rem; }

  .nav-toggle { padding: 0.42rem 0.55rem; gap: 0.35rem; }

  .nav-toggle__label { display: none; }

  .figure--wide .figure__frame { aspect-ratio: 4 / 3; }
}

/* ---------- 18. 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }

  .progress__bar { transition: none; }

  .to-top { transform: none; }
}