/* =========================================================
   U体育看台 · /assets/site.css
   共享层：reset / 变量 / 中文排版 / 页头 / 页脚 / 基础组件
   ========================================================= */

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}
body { margin: 0; }
h1, h2, h3, h4, h5, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }
ul, ol { list-style: none; padding: 0; }
img, svg, video, picture { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

/* ---------- 变量 ---------- */
:root {
  /* 品牌色板 */
  --night:      #0A1428; /* 看台夜蓝 */
  --deck:       #101F3C; /* 深蓝台面 */
  --line:       #1B2E52; /* 蓝灰界线 */
  --paper:      #F2E6D0; /* 暖纸台面 */
  --orange:     #E8560F; /* 赛场橙红 */
  --orange-hi:  #FF6B2C; /* 橙红高亮 */
  --lime:       #B4FF3D; /* 球衣荧光绿 */
  --amber:      #FFB020; /* 琥珀待定 */
  --mist:       #7FA0C8; /* 雾蓝次级字 */
  --bright:     #EAEFF7; /* 看台亮白 */

  /* 暖纸带作用域内的反相语义 */
  --paper-ink:  #16233D;

  /* 字体 */
  --font-head: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans CJK SC",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
               system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Source Han Sans SC", "Noto Sans CJK SC", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei",
               system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Mono", Consolas,
               "DejaVu Sans Mono", Menlo, monospace;

  /* 尺度 */
  --gut: clamp(20px, 6vw, 90px);
  --maxw: 1480px;
  --radius: 3px;
  --cut: 20px;
  --shadow-soft: 0 18px 46px -28px rgba(0, 0, 0, .85);
}

/* ---------- 基础排版 ---------- */
body {
  background-color: var(--night);
  color: var(--bright);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
main { display: block; }

h1, h2, h3, h4 {
  font-family: var(--font-head);
  line-height: 1.12;
  letter-spacing: -.02em;
  font-weight: 800;
}
h1 { font-size: clamp(30px, 4.6vw, 56px); }
h2 { font-size: clamp(24px, 3vw, 36px); }
h3 { font-size: clamp(19px, 1.6vw, 22px); }
h4 { font-size: 17px; }
strong, b { font-weight: 700; color: var(--bright); }

.num,
[data-roll] {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

/* ---------- 工具类 ---------- */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px; left: 10px;
  z-index: 400;
  padding: 10px 18px;
  background: var(--lime);
  color: #08131F;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: .02em;
  border-radius: var(--radius);
  transform: translateY(-180%);
  transition: transform .22s ease;
}
.skip-link:focus,
.skip-link:focus-visible { transform: translateY(0); }

/* ---------- 内容容器与网格 ---------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gut);
}
.wrap--narrow { max-width: 880px; }

.grid { display: grid; gap: clamp(20px, 3vw, 44px); }
.grid--5-7 { grid-template-columns: 5fr 7fr; }
.grid--4-8 { grid-template-columns: 4fr 8fr; }

/* ---------- 页头 ---------- */
.deck-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: rgba(10, 20, 40, .88);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  transition: background .3s ease, border-color .3s ease;
}
.deck-header.is-scrolled {
  background: rgba(8, 16, 32, .96);
  border-bottom-color: rgba(232, 86, 15, .38);
}
.deck-header__inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 18px var(--gut) 16px;
  display: flex;
  align-items: center;
  gap: clamp(16px, 3vw, 40px);
  transition: padding .3s ease;
}
.deck-header.is-scrolled .deck-header__inner { padding-top: 10px; padding-bottom: 9px; }

.deck-header__brand { flex: 0 0 auto; }

.brand { display: inline-flex; flex-direction: column; gap: 1px; }
.brand__mark {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(19px, 1.9vw, 24px);
  letter-spacing: -.035em;
  color: var(--bright);
  line-height: 1.1;
}
.brand__mark::after {
  content: "";
  display: inline-block;
  width: 7px; height: 7px;
  margin-left: 7px;
  background: var(--orange);
  transform: translateY(-2px);
}
.brand__sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .07em;
  color: var(--mist);
  white-space: nowrap;
}

/* 导航 */
.deck-nav { margin-left: auto; }
.deck-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(8px, 1.7vw, 26px);
}
.deck-nav__item { display: block; }
.deck-nav__link {
  position: relative;
  display: inline-block;
  padding: 7px 2px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .01em;
  color: var(--mist);
  white-space: nowrap;
  transition: color .2s ease;
}
.deck-nav__link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 1px;
  height: 2px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .26s cubic-bezier(.4, 0, .2, 1);
}
.deck-nav__link:hover,
.deck-nav__link:focus-visible { color: var(--bright); }
.deck-nav__link:hover::after,
.deck-nav__link:focus-visible::after { transform: scaleX(1); }
.deck-nav__link[aria-current="page"] { color: var(--bright); }
.deck-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--lime);
}

/* 右侧工具区 */
.deck-header__utility {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: 6px;
}
.section-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid rgba(232, 86, 15, .45);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--orange-hi);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.util-link {
  display: inline-flex;
  align-items: center;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 600;
  color: var(--bright);
  white-space: nowrap;
  transition: border-color .2s ease, background .2s ease, color .2s ease;
}
.util-link:hover { border-color: var(--mist); color: var(--lime); }
.util-link--cta {
  background: var(--orange);
  border-color: var(--orange);
  color: #150500;
  font-weight: 800;
}
.util-link--cta:hover {
  background: var(--orange-hi);
  border-color: var(--orange-hi);
  color: #150500;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  margin-left: 4px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(16, 31, 60, .7);
  transition: border-color .2s ease;
}
.nav-toggle:hover { border-color: var(--orange); }
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--bright);
  transition: background .2s ease;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--bright);
  transition: transform .24s ease;
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.deck-header[data-open="true"] .nav-toggle__bars { background: transparent; }
.deck-header[data-open="true"] .nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.deck-header[data-open="true"] .nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }
.nav-toggle__label {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* 阅读进度 */
.deck-header__progress {
  position: absolute;
  left: 0; bottom: 0;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--orange), var(--lime));
  transition: width .12s linear;
}

/* ---------- 页脚 ---------- */
.deck-footer {
  position: relative;
  margin-top: clamp(64px, 10vw, 150px);
  background: var(--deck);
  border-top: 1px solid var(--line);
  color: var(--bright);
}
.deck-footer::before {
  content: "";
  position: absolute;
  top: -1px; left: 0;
  width: clamp(64px, 12vw, 190px);
  height: 3px;
  background: var(--orange);
}
.deck-footer__inner {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(42px, 6vw, 76px) var(--gut) clamp(28px, 4vw, 48px);
  display: grid;
  grid-template-columns: minmax(220px, 1fr) 2.1fr;
  gap: clamp(30px, 5vw, 88px);
}
.deck-footer__mark {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(20px, 2vw, 24px);
  letter-spacing: -.03em;
}
.deck-footer__line {
  margin-top: 12px;
  max-width: 30ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}
.deck-footer__copyright {
  margin-top: 20px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}
.deck-footer__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--orange-hi);
}
.deck-footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 52px);
}
.deck-footer__col { min-width: 0; }
.deck-footer__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .2em;
  color: var(--orange-hi);
}
.deck-footer__list { display: flex; flex-direction: column; gap: 11px; }
.deck-footer__link {
  display: inline-block;
  font-size: 14.5px;
  color: rgba(234, 239, 247, .76);
  transition: color .2s ease, transform .2s ease;
}
.deck-footer__link:hover,
.deck-footer__link:focus-visible { color: var(--lime); transform: translateX(3px); }
.deck-footer__meta {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 20px var(--gut) clamp(30px, 4vw, 44px);
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 30px;
}
.deck-footer__contact,
.deck-footer__legal {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .03em;
  line-height: 1.9;
  color: var(--mist);
}
.deck-footer__legal { color: rgba(127, 160, 200, .82); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-head);
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: .02em;
  background: var(--deck);
  color: var(--bright);
  transition: background .2s ease, color .2s ease, border-color .2s ease, transform .2s ease;
}
.btn:hover { transform: translateY(-2px); }
.btn--primary { background: var(--orange); color: #150500; }
.btn--primary:hover { background: var(--orange-hi); }
.btn--ghost { background: transparent; border-color: var(--line); color: var(--bright); }
.btn--ghost:hover { border-color: var(--lime); color: var(--lime); }
.btn--lime { background: var(--lime); color: #0A1428; }
.btn--lime:hover { background: #C8FF66; }

/* ---------- 面包屑 ---------- */
.breadcrumb { padding-top: clamp(18px, 2.5vw, 30px); }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--mist);
}
.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: var(--line);
}
.breadcrumb__link { color: var(--mist); transition: color .2s ease; }
.breadcrumb__link:hover,
.breadcrumb__link:focus-visible { color: var(--lime); }
.breadcrumb__current { color: var(--bright); }

/* ---------- 章节 ---------- */
.chapter + .chapter { margin-top: clamp(52px, 8vw, 120px); }
.chapter__head { display: block; }
.chapter__index {
  position: relative;
  display: inline-block;
  padding-left: 14px;
  font-family: var(--font-mono);
  font-weight: 300;
  font-size: 12.5px;
  letter-spacing: .22em;
  color: var(--orange-hi);
  font-variant-numeric: tabular-nums;
}
.chapter__index::before {
  content: "";
  position: absolute;
  left: 0; top: .25em; bottom: .25em;
  width: 4px;
  background: var(--orange);
}
.chapter__title {
  display: block;
  margin-top: 14px;
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(30px, 5.6vw, 78px);
  line-height: 1.05;
  letter-spacing: -.035em;
  color: var(--bright);
}
.chapter__lede {
  margin-top: 18px;
  max-width: 58ch;
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.8;
  color: var(--mist);
}
.rule-accent {
  display: block;
  width: 48px;
  height: 2px;
  margin: 22px 0 24px;
  background: var(--orange);
}

/* ---------- 过渡色带 ---------- */
.band {
  --bright: #16233D;
  --mist: #55688A;
  --line: rgba(10, 20, 40, .18);
  background: var(--paper);
  color: #16233D;
  padding: clamp(36px, 6vw, 78px) 0;
}
.band--deck {
  --bright: #EAEFF7;
  --mist: #7FA0C8;
  --line: #1B2E52;
  background: var(--deck);
  color: var(--bright);
}
.band--night {
  --bright: #EAEFF7;
  --mist: #7FA0C8;
  --line: #1B2E52;
  background: var(--night);
  color: var(--bright);
}

/* ---------- 正文 ---------- */
.prose {
  font-size: clamp(15px, 1.05vw, 16.5px);
  line-height: 1.85;
  color: var(--bright);
  max-width: 68ch;
}
.prose p + p { margin-top: .9em; }
.prose a { color: var(--orange-hi); text-decoration: underline; text-underline-offset: 3px; }
.prose--paper {
  max-width: none;
  background: var(--paper);
  color: var(--paper-ink);
  padding: clamp(22px, 3.4vw, 44px);
  border-radius: var(--radius);
}
.prose--paper a { color: var(--orange); }

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background: linear-gradient(158deg, rgba(27, 46, 82, .74), rgba(16, 31, 60, .94));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
}
.card--cut {
  border: 0;
  border-radius: 0;
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}
.card--paper {
  background: var(--paper);
  border-color: rgba(10, 20, 40, .14);
  color: #16233D;
  box-shadow: none;
}

/* ---------- 标签与状态 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--mist);
  white-space: nowrap;
}
.tag--live { background: var(--lime); border-color: var(--lime); color: #0A1428; }
.tag--hot { background: var(--orange); border-color: var(--orange); color: #150500; }
.tag--pending { background: var(--amber); border-color: var(--amber); color: #241400; }
.tag--muted { background: transparent; border-color: var(--line); color: var(--mist); }

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime);
  flex: 0 0 auto;
}
.status-dot--live { animation: seat-pulse 2.4s ease-in-out infinite; }
@keyframes seat-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .42; transform: scale(.8); }
}

/* ---------- 数据块 ---------- */
.stat {
  padding: 14px 0;
  border-top: 1px solid var(--line);
}
.stat__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--mist);
}
.stat__value {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.14;
  color: var(--bright);
  text-align: right;
}
.stat__unit {
  margin-left: 4px;
  font-size: .48em;
  letter-spacing: .08em;
  color: var(--mist);
}

.data-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}
.data-row__key { font-size: 14px; color: var(--mist); min-width: 0; }
.data-row__val {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  color: var(--bright);
  text-align: right;
  flex: 0 0 auto;
}

/* ---------- 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 4 / 3;
  background: linear-gradient(140deg, var(--deck), #08111F 78%);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--plain { border: 0; }
.media-frame > img,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.92) contrast(1.04);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 20, 40, 0) 42%, rgba(10, 20, 40, .78) 100%);
  pointer-events: none;
}
.media-frame--plain::after { display: none; }
.media-frame--placeholder::before {
  content: attr(data-caption);
  position: absolute;
  left: 0; right: 0; bottom: 0;
  z-index: 2;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .09em;
  color: var(--mist);
}

/* ---------- 折叠面板 ---------- */
.panel-fold { border-top: 1px solid var(--line); }
.panel-fold__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  text-align: left;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  color: var(--bright);
}
.panel-fold__icon {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--orange);
  transition: transform .24s ease;
}
.panel-fold__trigger[aria-expanded="true"] .panel-fold__icon { transform: rotate(45deg); }
.panel-fold__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .3s ease;
}
.panel-fold__panel.is-open { grid-template-rows: 1fr; }
.panel-fold__inner {
  overflow: hidden;
  font-size: 15px;
  line-height: 1.82;
  color: var(--mist);
}
.panel-fold__inner > *:last-child { padding-bottom: 18px; }

/* ---------- 横向滑动区 ---------- */
.swipe-row {
  position: relative;
  --fade: var(--night);
}
.swipe-row__track {
  display: flex;
  gap: clamp(12px, 1.6vw, 20px);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  padding-bottom: 16px;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}
.swipe-row__track::-webkit-scrollbar { height: 6px; }
.swipe-row__track::-webkit-scrollbar-track { background: transparent; }
.swipe-row__track::-webkit-scrollbar-thumb { background: var(--line); border-radius: 999px; }
.swipe-row__track > * {
  flex: 0 0 min(330px, 78vw);
  scroll-snap-align: start;
}
.swipe-row::before,
.swipe-row::after {
  content: "";
  position: absolute;
  top: 0; bottom: 16px;
  width: 44px;
  z-index: 2;
  pointer-events: none;
}
.swipe-row::before { left: 0; background: linear-gradient(90deg, var(--fade), transparent); }
.swipe-row::after { right: 0; background: linear-gradient(270deg, var(--fade), transparent); }

/* ---------- 关注按钮 ---------- */
.seat-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 600;
  color: var(--bright);
  transition: border-color .2s ease, background .2s ease, color .2s ease;
}
.seat-btn:hover { border-color: var(--mist); }
.seat-btn__count {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  color: var(--mist);
  transition: color .2s ease;
}
.seat-btn[aria-pressed="true"] {
  border-color: var(--lime);
  background: rgba(180, 255, 61, .09);
  color: var(--lime);
}
.seat-btn[aria-pressed="true"] .seat-btn__count { color: var(--lime); }

/* ---------- 滚动显现 ---------- */
[data-reveal] { opacity: 1; transform: none; }
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .34s ease, transform .34s ease;
}
html.js [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 平板 ---------- */
@media (max-width: 1080px) {
  .section-chip { display: none; }
  .grid--5-7,
  .grid--4-8 { grid-template-columns: 1fr; }
  .deck-footer__inner { grid-template-columns: 1fr; }
}

/* ---------- 移动端 ---------- */
@media (max-width: 900px) {
  :root { --gut: 20px; }
  html { scroll-padding-top: 74px; }

  body { padding-bottom: 58px; }

  .deck-header__inner {
    padding: 10px 20px;
    gap: 10px;
  }
  .deck-header.is-scrolled .deck-header__inner { padding-top: 9px; padding-bottom: 9px; }
  .brand__sub { display: none; }
  .brand__mark { font-size: 19px; }

  .deck-header__utility {
    margin-left: auto;
    gap: 6px;
  }
  .util-link {
    padding: 6px 10px;
    font-size: 12.5px;
    border-color: transparent;
    color: var(--mist);
  }
  .util-link--cta {
    padding: 6px 11px;
    background: transparent;
    border-color: var(--orange);
    color: var(--orange-hi);
  }
  .util-link--cta:hover { background: rgba(232, 86, 15, .14); color: var(--orange-hi); }

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

  /* 底部固定栏目条 */
  .deck-nav {
    position: fixed;
    left: 0; right: 0; bottom: 0;
    z-index: 130;
    margin: 0;
    background: rgba(8, 16, 32, .97);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
    border-top: 1px solid var(--line);
    padding-bottom: env(safe-area-inset-bottom, 0px);
  }
  .deck-nav__list {
    display: flex;
    align-items: stretch;
    gap: 0;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .deck-nav__list::-webkit-scrollbar { display: none; }
  .deck-nav__link {
    display: block;
    flex: 0 0 auto;
    padding: 13px 15px;
    font-size: 13px;
    color: var(--mist);
  }
  .deck-nav__link::after { display: none; }
  .deck-nav__link[aria-current="page"] {
    color: var(--lime);
    background: rgba(180, 255, 61, .09);
    box-shadow: inset 0 2px 0 var(--lime);
  }

  /* 展开态：两列纵向全列 */
  .deck-header[data-open="true"] .deck-nav__list {
    overflow: visible;
    flex-wrap: wrap;
    max-height: 62vh;
    overflow-y: auto;
  }
  .deck-header[data-open="true"] .deck-nav__link {
    flex: 0 0 50%;
    max-width: 50%;
    padding: 13px 20px;
    font-size: 14px;
    border-top: 1px solid var(--line);
  }

  .deck-footer__inner { padding-top: 40px; }
  .deck-footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px 20px; }
  .deck-footer__meta { padding-bottom: 30px; }
  .chapter__title { font-size: clamp(28px, 8.6vw, 46px); }
  .swipe-row__track > * { flex: 0 0 82vw; }
}

/* ---------- 小屏 ---------- */
@media (max-width: 520px) {
  .deck-footer__cols { grid-template-columns: 1fr; }
  .deck-footer__list { flex-direction: row; flex-wrap: wrap; gap: 10px 18px; }
  .stat__value { text-align: left; }
}

/* ---------- 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  html.js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: opacity .2s ease;
  }
  .status-dot--live { animation: none; }
  .btn:hover { transform: none; }
  .deck-footer__link:hover { transform: none; }
  .deck-nav__link::after,
  .deck-header__progress { transition: none; }
  .panel-fold__panel { transition: none; }
  .skip-link { transition: none; }
}