/* ============================================================
   问鼎PG · Site Kit 共享样式 /assets/site.css
   墨鼎黑底盘 · 鎏金数据 · 铜锈青归类 · 朱砂红提示
   ============================================================ */

/* ---------- 1. 设计变量 ---------- */
:root {
  --ink: #0B0C0E;
  --ink-2: #14161A;
  --ink-3: #22262C;
  --edge: #2A2F36;
  --edge-soft: #1C2026;

  --gold: #C9A227;
  --gold-bright: #E8C766;
  --gold-deep: #8A6F14;
  --patina: #3E7C74;
  --patina-light: #7FB3AB;
  --cinnabar: #C2402E;
  --cinnabar-light: #E08676;

  --paper: #EDE7DA;
  --paper-dim: #CFC7B8;
  --note: #A79F92;
  --note-dim: #8C857A;

  --font-display: "Songti SC", "STSong", "Noto Serif SC", "SimSun", "Times New Roman", serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", "Cascadia Mono", Consolas, "Liberation Mono", monospace;

  --maxw: 1320px;
  --radius: 2px;
  --gutter: clamp(1.25rem, 5vw, 4rem);
  --section-pad: clamp(2.5rem, 6vw, 5rem);
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background-color: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 .6em;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: .01em;
  color: var(--paper);
}

p { margin: 0 0 1em; }

a {
  color: var(--gold-bright);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

button { font: inherit; color: inherit; }

ul, ol { margin: 0 0 1em; }

hr {
  height: 1px;
  border: 0;
  background: var(--edge);
}

::selection {
  background: var(--gold);
  color: var(--ink);
}

:focus-visible {
  outline: 2px solid var(--gold-bright);
  outline-offset: 2px;
  border-radius: 1px;
}

#main-content { scroll-margin-top: 150px; }

/* ---------- 3. 容器与分区 ---------- */
.wrap {
  width: min(100% - var(--gutter), var(--maxw));
  margin-inline: auto;
}

.section { padding-block: var(--section-pad); }
.section--ink2 { background-color: var(--ink-2); }
.section--tight { padding-block: clamp(1.5rem, 4vw, 2.5rem); }
.section--flush { padding-block: 0; }

.divider {
  height: 1px;
  border: 0;
  margin: clamp(1.5rem, 4vw, 3rem) 0;
  background: var(--edge);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 4. 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(1rem, 2.5vw, 2rem);
}

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

.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; }
.offset-1 { grid-column-start: 2; }

/* ---------- 5. 排版组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--patina-light);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: .75;
}

.display {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.6rem, 8vw, 6.4rem);
  line-height: 1.02;
  letter-spacing: .01em;
  color: var(--paper);
  text-wrap: balance;
}

.display--sm { font-size: clamp(2rem, 5vw, 3.4rem); }

.lede {
  max-width: 46ch;
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  line-height: 1.85;
  color: var(--paper-dim);
}

.prose {
  max-width: 68ch;
  color: var(--paper-dim);
}

.prose > *:last-child { margin-bottom: 0; }

.prose h2 {
  margin: 2em 0 .55em;
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  color: var(--paper);
}

.prose h3 {
  margin: 1.6em 0 .5em;
  font-size: clamp(1.1rem, 1.8vw, 1.35rem);
  color: var(--paper);
}

.prose ul,
.prose ol { padding-left: 1.3em; }

.prose li { margin-bottom: .4em; }

.prose strong { color: var(--paper); font-weight: 600; }

.prose a { color: var(--gold-bright); }

.section-head {
  display: grid;
  gap: .6rem;
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
}

.section-head__title {
  margin: 0;
  font-size: clamp(1.6rem, 3.6vw, 2.6rem);
  line-height: 1.15;
}

.section-head__aside {
  max-width: 42ch;
  font-size: .85rem;
  color: var(--note);
}

.archive-code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--note);
}

/* ---------- 6. 数据与标签 ---------- */
.data-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--gold);
}

.data-value--bright { color: var(--gold-bright); }

.stat {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: .95rem 0;
  border-top: 1px solid var(--edge);
}

.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: .04em;
  color: var(--gold);
}

.stat__label {
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--note);
}

.stat__note {
  font-size: .8rem;
  color: var(--note-dim);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .24rem .55rem;
  border: 1px solid transparent;
  border-radius: 1px;
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
  white-space: nowrap;
}

.tag--patina {
  color: var(--patina-light);
  background-color: rgba(62, 124, 116, .16);
  border-color: rgba(62, 124, 116, .5);
}

.tag--gold {
  color: var(--gold-bright);
  background-color: rgba(201, 162, 39, .14);
  border-color: rgba(201, 162, 39, .45);
}

.tag--cinnabar {
  color: var(--cinnabar-light);
  background-color: rgba(194, 64, 46, .16);
  border-color: rgba(194, 64, 46, .5);
}

.callout {
  padding: .9rem 1.1rem;
  border-left: 2px solid var(--patina);
  background-color: rgba(62, 124, 116, .08);
  color: var(--paper-dim);
  font-size: .92rem;
}

.callout--gold {
  border-left-color: var(--gold);
  background-color: rgba(201, 162, 39, .08);
}

/* ---------- 7. 档案索引列表 ---------- */
.index-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.index-list__item { border-top: 1px solid var(--edge); }
.index-list__item:last-child { border-bottom: 1px solid var(--edge); }

.index-list__link {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: clamp(.75rem, 2vw, 1.5rem);
  padding: 1rem .25rem;
  color: var(--paper);
  text-decoration: none;
  transition: background-color .2s var(--ease), padding-left .2s var(--ease);
}

.index-list__link:hover {
  background-color: rgba(201, 162, 39, .06);
  padding-left: .8rem;
}

.index-list__no {
  font-family: var(--font-mono);
  font-size: .76rem;
  letter-spacing: .14em;
  color: var(--patina-light);
}

.index-list__title { font-size: 1rem; }

.index-list__meta {
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--note);
}

/* ---------- 8. 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  background-image: linear-gradient(150deg, #14161A 0%, #0B0C0E 72%);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(120% 90% at 25% 10%, rgba(201, 162, 39, .16), transparent 55%);
}

.media-frame__img,
.media-frame > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide { aspect-ratio: 16 / 7; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--auto { aspect-ratio: auto; }

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1;
  padding: .85rem 1rem;
  font-size: .78rem;
  color: var(--paper);
  background-image: linear-gradient(180deg, transparent, rgba(11, 12, 14, .92));
}

.media-frame__index {
  position: absolute;
  top: .75rem;
  left: .75rem;
  z-index: 1;
  padding: .15rem .45rem;
  border: 1px solid rgba(201, 162, 39, .35);
  background-color: rgba(11, 12, 14, .72);
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .16em;
  color: var(--gold-bright);
}

/* ---------- 9. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  padding: .68rem 1.2rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: .85rem;
  font-weight: 600;
  letter-spacing: .08em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.btn--gold {
  background-color: var(--gold);
  color: var(--ink);
}

.btn--gold:hover { background-color: var(--gold-bright); }

.btn--ghost {
  background-color: transparent;
  color: var(--gold-bright);
  border-color: rgba(201, 162, 39, .45);
}

.btn--ghost:hover {
  background-color: rgba(201, 162, 39, .12);
  border-color: rgba(201, 162, 39, .8);
}

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

.btn--cinnabar:hover { background-color: #D4503D; }

/* ---------- 10. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
  font-size: .78rem;
  letter-spacing: .1em;
  color: var(--note);
}

.breadcrumb a {
  color: var(--patina-light);
  text-decoration: none;
}

.breadcrumb a:hover { color: var(--gold-bright); }

.breadcrumb__sep { color: #3A4048; }

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

/* ---------- 11. 头部 ---------- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -5rem;
  z-index: 200;
  padding: .7rem 1.1rem;
  border-radius: var(--radius);
  background-color: var(--gold);
  color: var(--ink);
  font-size: .85rem;
  font-weight: 700;
  text-decoration: none;
  transition: top .18s var(--ease);
}

.skip-link:focus { top: .75rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background-color: var(--ink);
}

.brandbar {
  position: relative;
  background-image: linear-gradient(180deg, #14161A 0%, #0B0C0E 100%);
  border-bottom: 1px solid var(--edge);
}

.brandbar__inner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(1rem, 3vw, 2.5rem);
  min-height: 76px;
  padding-block: .7rem;
}

.brandbar__brand {
  display: flex;
  align-items: center;
  gap: .7rem;
  color: var(--paper);
  text-decoration: none;
}

.brandbar__mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius);
  background-image: linear-gradient(145deg, var(--gold-bright) 0%, var(--gold) 55%, var(--gold-deep) 100%);
  box-shadow: inset 0 0 0 1px rgba(11, 12, 14, .45);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 900;
  line-height: 1;
}

.brandbar__names {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brandbar__name {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: .1em;
}

.brandbar__domain {
  font-family: var(--font-mono);
  font-size: .66rem;
  letter-spacing: .16em;
  color: var(--note);
}

.brandbar__season {
  display: flex;
  align-items: center;
  gap: .7rem;
  margin: 0;
  padding-left: clamp(.75rem, 2vw, 1.5rem);
  border-left: 1px solid var(--edge);
  font-size: .82rem;
}

.brandbar__season-code {
  padding: .15rem .45rem;
  border: 1px solid rgba(62, 124, 116, .55);
  border-radius: 1px;
  background-color: rgba(62, 124, 116, .14);
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--patina-light);
  white-space: nowrap;
}

.brandbar__season-text { color: var(--note); }

.brandbar__actions {
  display: flex;
  align-items: center;
  gap: .6rem;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: .5rem;
  padding: .55rem .75rem;
  border: 1px solid var(--edge);
  border-radius: var(--radius);
  background-color: transparent;
  color: var(--paper);
  font-size: .82rem;
  letter-spacing: .12em;
  cursor: pointer;
}

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  background-color: var(--gold);
  transition: transform .2s var(--ease), opacity .2s var(--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); }

.navband {
  position: relative;
  background-color: var(--ink);
  border-bottom: 1px solid var(--edge);
}

.navband__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.navband__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
}

.navband__item { display: flex; align-items: center; }

.navband__item + .navband__item::before {
  content: "";
  width: 5px;
  height: 5px;
  margin-inline: clamp(.55rem, 1.6vw, 1.1rem);
  border-radius: 50%;
  background-color: var(--patina);
  opacity: .75;
}

.navband__link {
  display: inline-block;
  padding: .85rem 0;
  border-bottom: 2px solid transparent;
  color: var(--paper);
  font-size: .94rem;
  letter-spacing: .06em;
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.navband__link:hover { color: var(--gold-bright); }

.navband__link[aria-current="page"] {
  color: var(--gold-bright);
  border-bottom-color: var(--gold);
}

.navband__cta { display: none; }

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background-image: linear-gradient(90deg, var(--patina) 0%, var(--gold) 60%, var(--gold-bright) 100%);
  transition: width .12s linear;
}

/* ---------- 12. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 6rem);
  padding-block: clamp(2.5rem, 5vw, 4rem) 1.5rem;
  background-color: var(--ink-2);
  border-top: 1px solid var(--edge);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
}

.site-footer__brand {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 800;
  letter-spacing: .1em;
  color: var(--paper);
  text-decoration: none;
}

.site-footer__note {
  margin: .7rem 0 1rem;
  font-size: .85rem;
  color: var(--note);
  max-width: 30ch;
}

.site-footer__title {
  margin: 0 0 .9rem;
  font-family: var(--font-body);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--patina-light);
}

.site-footer__list {
  display: grid;
  gap: .5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-footer__list a {
  color: var(--paper);
  opacity: .82;
  font-size: .9rem;
  text-decoration: none;
  transition: color .18s var(--ease), opacity .18s var(--ease);
}

.site-footer__list a:hover {
  color: var(--gold-bright);
  opacity: 1;
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .9rem 2rem;
  margin-top: clamp(2rem, 4vw, 3rem);
  padding-top: 1.4rem;
  border-top: 1px solid var(--edge);
  font-size: .82rem;
  color: var(--note);
}

.site-footer__legal-note { margin: 0; }

.site-footer__contacts {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem 1.75rem;
  margin: 0;
}

.site-footer__contact {
  display: flex;
  align-items: baseline;
  gap: .45rem;
}

.site-footer__contact dt {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .16em;
  color: var(--patina-light);
}

.site-footer__contact dd {
  margin: 0;
  color: var(--paper-dim);
}

.site-footer__meta {
  flex-basis: 100%;
  margin: 0;
  font-size: .78rem;
  color: var(--note-dim);
}

.to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: 110;
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .6rem .9rem;
  border: 1px solid rgba(201, 162, 39, .45);
  border-radius: var(--radius);
  background-color: rgba(20, 22, 26, .94);
  color: var(--gold-bright);
  font-size: .76rem;
  letter-spacing: .14em;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .24s var(--ease), transform .24s var(--ease), visibility .24s var(--ease);
}

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

.to-top:hover { background-color: rgba(201, 162, 39, .16); }

/* ---------- 13. 显现动效 ---------- */
[data-reveal] { opacity: 1; transform: none; }

html[data-js] [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .32s var(--ease), transform .32s var(--ease);
}

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

/* ---------- 14. 平板 ---------- */
@media (max-width: 1023px) {
  .brandbar__inner { grid-template-columns: minmax(0, 1fr) auto; }
  .brandbar__season { display: none; }
  .brandbar__cta { display: none; }
  .nav-toggle { display: inline-flex; }

  .navband {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    max-height: calc(100vh - 90px);
    overflow-y: auto;
    background-color: var(--ink-2);
    border-bottom: 1px solid var(--edge);
    box-shadow: 0 24px 44px rgba(0, 0, 0, .55);
  }

  .navband[data-open] { display: block; }

  .navband__inner {
    display: block;
    padding-block: .5rem 1.25rem;
  }

  .navband__list {
    flex-direction: column;
    align-items: stretch;
  }

  .navband__item {
    display: block;
    border-bottom: 1px solid var(--edge);
  }

  .navband__item + .navband__item::before { display: none; }

  .navband__link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: .95rem 0;
    border-bottom: 0;
    font-size: 1rem;
  }

  .navband__link[aria-current="page"] {
    border-bottom-color: transparent;
    color: var(--gold-bright);
  }

  .navband__link[aria-current="page"]::after {
    content: "当前栏目";
    font-family: var(--font-mono);
    font-size: .68rem;
    letter-spacing: .16em;
    color: var(--gold);
  }

  .navband__cta {
    position: sticky;
    bottom: 0;
    display: flex;
    gap: .6rem;
    margin-top: 1.25rem;
    padding-top: 1rem;
    padding-bottom: .35rem;
    background-image: linear-gradient(180deg, rgba(20, 22, 26, .65), var(--ink-2) 45%);
  }

  .navband__cta .btn { flex: 1; }

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

  .site-footer__inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer__brandcol { grid-column: 1 / -1; }
}

/* ---------- 15. 手机 ---------- */
@media (max-width: 719px) {
  body { font-size: 16px; }

  .brandbar__inner { min-height: 64px; }
  .brandbar__mark { width: 36px; height: 36px; font-size: 1.15rem; }
  .brandbar__name { font-size: 1.1rem; }

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

  .index-list__link {
    grid-template-columns: auto minmax(0, 1fr);
    row-gap: .35rem;
  }

  .index-list__meta { grid-column: 2 / -1; }

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

  .site-footer__legal { flex-direction: column; align-items: flex-start; }

  .media-frame--wide { aspect-ratio: 4 / 3; }
}

/* ---------- 16. 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  .scroll-progress__bar,
  .btn,
  .navband__link,
  .site-footer__list a,
  .index-list__link,
  .nav-toggle__bars i {
    transition: none;
  }

  .to-top {
    transition: none;
    transform: none;
  }
}