/* ===========================================================
   YABO 看台 · 共享样式 /assets/site.css
   夜间球场灯光 × 技术蓝图网格 × 复古出版纸面
   =========================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 132px;
}

body {
  margin: 0;
  background: var(--pitch-night);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.005em;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
}

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

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

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

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

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

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

:focus-visible {
  outline: 3px solid var(--lime);
  outline-offset: 3px;
  border-radius: 0;
}

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

/* ---------- 2. Tokens ---------- */
:root {
  /* 色彩 */
  --pitch-night: #08120D;
  --grass-deep: #0E2118;
  --blueprint: #1F3D2E;
  --lime: #C8FF3D;
  --lime-soft: #E6FF9C;
  --paper: #F5F1E6;
  --ink: #12140F;
  --signal: #FF7A2F;
  --muted: #8FA096;
  --ink-soft: #3C443B;

  /* 字体 */
  --font-display: "Archivo Narrow", "Arial Narrow", "Helvetica Neue", system-ui,
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  /* 尺寸与节奏 */
  --container: 1280px;
  --gutter: clamp(16px, 4vw, 40px);
  --gap: clamp(16px, 2.2vw, 28px);
  --section-y: clamp(48px, 7vw, 104px);

  /* 形状与阴影 */
  --shadow-hard: 8px 8px 0 rgba(0, 0, 0, 0.5);
  --shadow-soft: 4px 4px 0 rgba(0, 0, 0, 0.42);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 布局基础 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--section-y); position: relative; }

.section--grass { background: var(--grass-deep); }

.section--paper { background: var(--paper); color: var(--ink); }

.section--paper a { color: var(--ink); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px 24px;
  padding-bottom: 14px;
  margin-bottom: clamp(24px, 3vw, 44px);
  border-bottom: 2px solid var(--blueprint);
}

.section--paper .section-head { border-bottom-color: rgba(18, 20, 15, 0.5); }

.section-head__title { font-size: clamp(28px, 4.4vw, 52px); }

.grid { display: grid; gap: var(--gap); }

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

.grid-bg { position: relative; }

.grid-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--blueprint) 1px, transparent 1px),
    linear-gradient(to bottom, var(--blueprint) 1px, transparent 1px);
  background-size: 80px 80px;
  opacity: 0.32;
}

/* ---------- 4. 文字工具 ---------- */
.mono {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.coord {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.section--paper .coord { color: rgba(18, 20, 15, 0.55); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lime);
  margin-bottom: 14px;
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--lime);
}

.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.85;
}

.prose h2 { font-size: clamp(22px, 3vw, 34px); margin: 2em 0 0.55em; }
.prose h3 { font-size: clamp(18px, 2.2vw, 23px); margin: 1.7em 0 0.5em; }
.prose p { margin-bottom: 1.4em; }
.prose strong { font-weight: 700; color: var(--lime-soft); }
.section--paper .prose strong { color: var(--ink); }

.prose ul,
.prose ol { margin: 0 0 1.4em; padding-left: 1.2em; list-style: none; }

.prose li { position: relative; padding-left: 18px; margin-bottom: 0.6em; }

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 2px;
  background: var(--lime);
}

.section--paper .prose li::before { background: var(--signal); }

.divider {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-block: clamp(28px, 4vw, 56px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
}

.divider::before,
.divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--blueprint);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 2px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15px;
  color: var(--lime);
  border-bottom: 2px solid transparent;
  transition: gap 0.2s var(--ease), border-color 0.2s var(--ease);
}

.link-arrow::after { content: "\2192"; }

.link-arrow:hover,
.link-arrow:focus-visible { gap: 13px; border-bottom-color: var(--lime); }

.section--paper .link-arrow { color: var(--ink); }
.section--paper .link-arrow:hover { border-bottom-color: var(--ink); }

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 14px;
  letter-spacing: 0.02em;
  text-align: center;
  border: 2px solid transparent;
  transition: transform 0.18s var(--ease), background 0.18s var(--ease),
    color 0.18s var(--ease), border-color 0.18s var(--ease),
    box-shadow 0.18s var(--ease);
}

.btn--accent {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--ink);
  box-shadow: var(--shadow-soft);
}

.btn--accent:hover,
.btn--accent:focus-visible {
  background: var(--lime-soft);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.5);
}

.btn--ghost {
  background: transparent;
  border-color: var(--blueprint);
  color: var(--paper);
}

.btn--ghost:hover,
.btn--ghost:focus-visible { border-color: var(--lime); color: var(--lime); }

.btn--signal {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--ink);
  box-shadow: var(--shadow-soft);
}

.btn--signal:hover,
.btn--signal:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.5);
}

.btn--quiet {
  background: transparent;
  border-color: transparent;
  color: var(--muted);
  padding-inline: 10px;
}

.btn--quiet:hover,
.btn--quiet:focus-visible { color: var(--lime); }

.btn--block { width: 100%; }

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 6. 卡片 / 标签 / 数据 ---------- */
.card {
  position: relative;
  background: var(--grass-deep);
  border: 1px solid var(--blueprint);
  border-top: 3px solid var(--lime);
  padding: clamp(18px, 2.4vw, 28px);
}

.card--dark {
  background: rgba(8, 18, 13, 0.72);
  border-color: var(--blueprint);
  border-top-color: var(--blueprint);
}

.card--paper {
  background: var(--paper);
  color: var(--ink);
  border: 2px solid var(--ink);
  border-top: 3px solid var(--ink);
  box-shadow: var(--shadow-hard);
}

.card__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 12px;
}

.card--paper .card__index { color: rgba(18, 20, 15, 0.55); }

.card__title { font-size: clamp(18px, 2.2vw, 25px); margin-bottom: 10px; }

.card__text {
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--muted);
}

.card--paper .card__text { color: var(--ink-soft); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--lime-soft);
  background: rgba(200, 255, 61, 0.06);
  border: 1px solid var(--blueprint);
}

.tag--signal {
  color: var(--signal);
  background: rgba(255, 122, 47, 0.08);
  border-color: rgba(255, 122, 47, 0.55);
}

.tag--paper {
  color: var(--ink);
  background: transparent;
  border-color: rgba(18, 20, 15, 0.4);
}

.stat { display: block; }

.stat__value {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6vw, 82px);
  line-height: 0.96;
  letter-spacing: -0.03em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.stat__label {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.section--paper .stat__value { color: var(--ink); }
.section--paper .stat__label { color: rgba(18, 20, 15, 0.6); }

.table-scroll {
  overflow-x: auto;
  border: 1px solid var(--blueprint);
  background: rgba(8, 18, 13, 0.35);
}

.data-table { min-width: 520px; font-size: 15px; }

.data-table th {
  padding: 11px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-align: left;
  white-space: nowrap;
  color: var(--lime);
  border-bottom: 2px solid var(--blueprint);
}

.data-table td {
  padding: 11px 14px;
  border-bottom: 1px solid var(--blueprint);
  font-variant-numeric: tabular-nums;
}

.data-table tbody tr:last-child td { border-bottom: 0; }
.data-table tbody tr:hover td { background: rgba(200, 255, 61, 0.06); }

.data-table--paper { color: var(--ink); background: var(--paper); }

.data-table--paper th {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

.data-table--paper td { border-bottom-color: rgba(18, 20, 15, 0.22); }
.data-table--paper tbody tr:hover td { background: rgba(255, 122, 47, 0.1); }

.notice {
  padding: 16px 18px;
  border-left: 4px solid var(--signal);
  background: rgba(255, 122, 47, 0.08);
  color: var(--lime-soft);
  font-size: 15px;
  line-height: 1.7;
}

.section--paper .notice {
  color: var(--ink-soft);
  background: rgba(255, 122, 47, 0.12);
}

/* ---------- 7. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

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

.breadcrumbs li + li::before {
  content: "/";
  color: var(--blueprint);
}

.breadcrumbs a { color: var(--muted); transition: color 0.18s var(--ease); }
.breadcrumbs a:hover { color: var(--lime); }
.breadcrumbs [aria-current="page"] { color: var(--lime-soft); }

/* ---------- 8. 图片容器（页面阶段放置图片占位） ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--grass-deep);
  border: 2px solid var(--blueprint);
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 4 / 5; }

.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.06);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(31, 61, 46, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(31, 61, 46, 0.55) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.55;
}

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 22px 14px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--lime-soft);
  background: linear-gradient(0deg, rgba(8, 18, 13, 0.94), rgba(8, 18, 13, 0));
}

/* ---------- 9. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 200;
  padding: 12px 18px;
  background: var(--lime);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  transition: top 0.2s var(--ease);
}

.skip-link:focus { top: 14px; }

/* ---------- 10. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  color: var(--paper);
  background: linear-gradient(180deg, rgba(8, 18, 13, 0.98), rgba(8, 18, 13, 0.92));
  border-bottom: 1px solid var(--blueprint);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.site-header__inner { padding-block: 0; }

.site-header__top {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px 20px;
  padding-block: 18px 12px;
  transition: padding 0.28s var(--ease);
}

.season-chip {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 6px 11px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  white-space: nowrap;
  color: var(--lime-soft);
  background: rgba(200, 255, 61, 0.05);
  border: 1px solid var(--blueprint);
  transition: opacity 0.2s var(--ease);
}

.season-chip__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 10px rgba(200, 255, 61, 0.9);
  animation: season-pulse 2.6s ease-in-out infinite;
}

@keyframes season-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.82); }
}

.masthead {
  justify-self: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  text-align: center;
}

.masthead__mark {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.2vw, 34px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.masthead__sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  transition: opacity 0.24s var(--ease);
}

.header-actions {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--paper);
  border: 2px solid var(--blueprint);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.nav-toggle:hover { border-color: var(--lime); color: var(--lime); }

.nav-toggle__bars {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--lime);
  box-shadow: 0 6px 0 var(--lime), 0 -6px 0 var(--lime);
}

.nav-toggle[aria-expanded="true"] {
  border-color: var(--lime);
  color: var(--lime);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars {
  background: var(--signal);
  box-shadow: 0 6px 0 var(--signal), 0 -6px 0 var(--signal);
}

/* 栏目行 */
.site-nav {
  position: relative;
  border-top: 1px solid var(--blueprint);
}

.site-nav__list { display: none; }

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 11px 16px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 14.5px;
  letter-spacing: 0.02em;
  color: var(--paper);
  transition: color 0.2s var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 6px;
  height: 2px;
  background: var(--lime);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s var(--ease);
}

.site-nav__link:hover,
.site-nav__link:focus-visible { color: var(--lime); }

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after,
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.site-nav__link[aria-current="page"] { color: var(--lime); }

.site-nav__index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.site-nav__link[aria-current="page"] .site-nav__index { color: var(--lime-soft); }

/* 移动端展开状态 */
.site-nav[data-open] { border-top-color: var(--lime); }

.site-nav[data-open] .site-nav__list {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  padding: 6px 0 16px;
}

.site-nav[data-open] .site-nav__link {
  width: 100%;
  padding: 14px 4px;
  font-size: 18px;
  border-bottom: 1px solid var(--blueprint);
}

.site-nav[data-open] .site-nav__link::after { display: none; }

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--lime), var(--signal));
  transition: width 0.1s linear;
}

/* 滚动收窄 */
.site-header[data-compact="true"] .site-header__top { padding-block: 8px 6px; }

.site-header[data-compact="true"] .masthead__mark { font-size: 22px; }

.site-header[data-compact="true"] .masthead__sub {
  opacity: 0;
  visibility: hidden;
  height: 0;
}

.site-header[data-compact="true"] .season-chip { opacity: 0; visibility: hidden; }

.site-header[data-compact="true"] .site-nav__link { padding-block: 9px; }

.site-header[data-compact="true"] ~ * { scroll-margin-top: 96px; }

/* ---------- 11. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 110px);
  background: var(--grass-deep);
  border-top: 2px solid var(--blueprint);
  color: var(--paper);
}

.site-footer__strip {
  margin: 0;
  padding: 10px 16px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink);
  background: var(--lime);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
  padding-block: clamp(36px, 5vw, 64px);
}

.site-footer__brand { display: block; }

.footer-mark {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3vw, 30px);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.site-footer__tagline {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime);
}

.site-footer__note {
  margin: 14px 0 0;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.site-footer__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px 18px;
}

.site-footer__title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime);
}

.site-footer__list li { margin-bottom: 9px; }

.site-footer__list a {
  font-size: 15px;
  color: var(--muted);
  transition: color 0.18s var(--ease);
}

.site-footer__list a:hover,
.site-footer__list a:focus-visible { color: var(--lime); }

.site-footer__contact {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 32px;
  padding-top: 22px;
  border-top: 1px solid var(--blueprint);
}

.site-footer__contact-line {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.site-footer__address {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.site-footer__base {
  background: rgba(8, 18, 13, 0.6);
  border-top: 1px solid var(--blueprint);
}

.site-footer__base-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-block: 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.site-footer__legal,
.site-footer__copy { margin: 0; }

/* ---------- 12. 滚动显现协议 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.62s var(--ease), transform 0.62s var(--ease);
}

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

/* ---------- 13. 响应式 ---------- */
@media (max-width: 1023px) {
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (max-width: 899px) {
  html { scroll-padding-top: 112px; }

  .site-header__top {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding-block: 14px 10px;
  }

  .masthead {
    order: 1;
    align-items: flex-start;
    text-align: left;
    gap: 1px;
  }

  .masthead__mark { font-size: 24px; }
  .masthead__sub { font-size: 9.5px; letter-spacing: 0.14em; }

  .season-chip {
    order: 2;
    padding: 4px 9px;
    font-size: 10px;
    letter-spacing: 0.05em;
  }

  .header-actions {
    order: 3;
    width: 100%;
    justify-content: space-between;
    gap: 10px;
  }

  .header-actions .btn--ghost { display: none; }
  .header-actions .btn--accent { flex: 1 1 auto; }
  .nav-toggle { flex: 0 0 auto; }

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

  .site-footer__note { max-width: none; }
}

@media (max-width: 639px) {
  body { font-size: 16px; }

  .grid--12 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .btn-row .btn { flex: 1 1 100%; }

  .site-footer__contact { flex-direction: column; }
}

@media (min-width: 760px) {
  .site-footer__inner { grid-template-columns: 1.05fr 1.6fr; }
}

@media (min-width: 900px) {
  .nav-toggle { display: none; }

  .site-nav { border-top: 1px solid var(--blueprint); }

  .site-nav__list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2px;
  }
}

/* ---------- 14. 无障碍与动效降级 ---------- */
.section--paper :focus-visible,
.card--paper :focus-visible { outline-color: var(--ink); }

@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;
    transition-delay: 0ms !important;
  }

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

  .season-chip__dot { animation: none; }
}