/* =============================================================
   BWIN必赢 · lineup-bwin.com.cn
   共享样式表 —— /assets/site.css
   夜赛墨绿数据台底 + 矿物色拼贴 + 编辑部非对称栏距
   页面专属布局请写入各自的页面样式表
   ============================================================= */

/* ---------- 0. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }

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

body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }

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

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

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

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

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

/* ---------- 1. 色彩与排版变量 ---------- */
:root {
  color-scheme: dark;

  --ink-900: #0B1B16;
  --ink-800: #0E211B;
  --ink-700: #163026;
  --char-900: #121010;
  --moss-700: #2E4A3C;
  --moss-600: #3C5C4B;
  --stone-500: #7C877F;
  --cream-100: #F2EFE6;
  --cream-200: #D8D4C6;
  --clay-500: #C97A52;
  --lime-400: #C6F135;
  --orange-500: #FF6A2B;
  --lime-pale: #E8F8C7;
  --teal-800: #123A38;

  --bg: var(--ink-900);
  --bg-deep: var(--char-900);
  --bg-panel: var(--moss-700);
  --text: var(--cream-100);
  --text-soft: rgba(242, 239, 230, 0.74);
  --text-mute: var(--stone-500);
  --line: rgba(124, 135, 127, 0.26);
  --line-strong: rgba(124, 135, 127, 0.5);

  --font-display: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-body: var(--font-display);
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;

  --shell: 1280px;
  --gutter: 24px;

  --r-organic: 22px 6px 22px 6px;
  --r-soft: 14px;
  --ease-hard: cubic-bezier(0.22, 0.72, 0.28, 1);
}

/* ---------- 2. 页面基底 ---------- */
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(1080px 520px at 84% -10%, rgba(46, 74, 60, 0.60), transparent 62%),
    radial-gradient(760px 460px at -8% 18%, rgba(18, 58, 56, 0.55), transparent 66%);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.72;
  letter-spacing: 0.012em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main { flex: 1 0 auto; display: block; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--cream-100);
}

h1 { font-size: clamp(34px, 5.4vw, 68px); letter-spacing: -0.035em; }
h2 { font-size: clamp(24px, 3.4vw, 38px); }
h3 { font-size: clamp(19px, 2vw, 24px); font-weight: 800; }
h4 { font-size: 17px; font-weight: 800; letter-spacing: -0.01em; }

::selection { background: var(--lime-400); color: var(--ink-900); }

/* ---------- 3. 通用工具类 ---------- */
.mono,
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  letter-spacing: 0.02em;
}

.idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--text-mute);
  text-transform: uppercase;
}

.wrap {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.rule { height: 1px; background: var(--line); border: 0; margin: 0; }
.rule--hot { background: linear-gradient(90deg, var(--clay-500), rgba(201, 122, 82, 0)); }

[id] { scroll-margin-top: 150px; }
#main-content { scroll-margin-top: 0; }

/* ---------- 4. 跳至主内容 ---------- */
.skip-link {
  position: fixed;
  left: 50%;
  top: 0;
  z-index: 300;
  transform: translate(-50%, -140%);
  background: var(--lime-400);
  color: #0B1B16;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 11px 20px;
  border-radius: 0 0 12px 12px;
  transition: transform 0.2s var(--ease-hard);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translate(-50%, 0);
  outline: 2px solid var(--cream-100);
  outline-offset: 2px;
}

/* ---------- 5. 焦点反馈 ---------- */
:where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--lime-400);
  outline-offset: 3px;
  border-radius: 3px;
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  white-space: nowrap;
  transition: background-color 0.18s var(--ease-hard), border-color 0.18s var(--ease-hard),
              color 0.18s var(--ease-hard), transform 0.18s var(--ease-hard);
}

.btn--lime { background: var(--lime-400); color: #0B1B16; }
.btn--lime:hover { background: #D8FF55; transform: translateY(-2px); }

.btn--orange { background: var(--orange-500); color: #17100C; font-weight: 700; }
.btn--orange:hover { background: #FF8352; transform: translateY(-2px); }

.btn--ghost { border-color: var(--line-strong); color: var(--cream-100); }
.btn--ghost:hover { border-color: var(--lime-400); color: var(--lime-400); transform: translateY(-2px); }

/* ---------- 7. 页头 ---------- */
.masthead {
  position: sticky;
  top: 0;
  z-index: 120;
  background: rgba(11, 27, 22, 0.94);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  transition: background-color 0.2s var(--ease-hard), box-shadow 0.2s var(--ease-hard);
}

.masthead[data-stuck] {
  background: rgba(9, 22, 18, 0.99);
  box-shadow: 0 18px 40px -28px rgba(0, 0, 0, 0.95);
}

.masthead__rail {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(124, 135, 127, 0.16);
  overflow: hidden;
  pointer-events: none;
}

.masthead__rail-bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--lime-400), var(--orange-500));
}

.masthead__inner {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.masthead__index {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  max-height: 62px;
  padding-top: 13px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.13em;
  color: var(--stone-500);
  transition: max-height 0.22s var(--ease-hard), opacity 0.18s linear, padding-top 0.22s var(--ease-hard);
}

.masthead__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lime-400);
  box-shadow: 0 0 0 4px rgba(198, 241, 53, 0.14);
  animation: masthead-pulse 2.6s ease-in-out infinite;
}

@keyframes masthead-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.34; }
}

.masthead__sep { color: rgba(124, 135, 127, 0.5); }

.masthead[data-stuck] .masthead__index {
  max-height: 0;
  padding-top: 0;
  overflow: hidden;
  opacity: 0;
}

.masthead__brandrow {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 18px;
  padding: 14px 0 10px;
  transition: padding 0.22s var(--ease-hard);
}

.masthead[data-stuck] .masthead__brandrow { padding: 8px 0 6px; }

.masthead__tagline {
  grid-column: 1;
  justify-self: start;
  max-width: 240px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.09em;
  color: var(--stone-500);
  transition: opacity 0.18s linear;
}

.masthead__brand {
  grid-column: 2;
  justify-self: center;
  font-family: var(--font-display);
  font-size: clamp(34px, 5.4vw, 62px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.045em;
  color: var(--cream-100);
  white-space: nowrap;
  transition: font-size 0.22s var(--ease-hard);
}

.masthead__brand::after {
  content: "";
  display: block;
  height: 2px;
  margin-top: 7px;
  background: linear-gradient(90deg, rgba(201, 122, 82, 0) 0%, var(--clay-500) 14%, var(--clay-500) 86%, rgba(201, 122, 82, 0) 100%);
}

.masthead__brand:hover { color: var(--lime-400); }

.masthead__cta { grid-column: 3; justify-self: end; }

.masthead[data-stuck] .masthead__brand { font-size: clamp(24px, 3.4vw, 34px); }
.masthead[data-stuck] .masthead__brand::after { margin-top: 4px; }
.masthead[data-stuck] .masthead__tagline { opacity: 0; pointer-events: none; }

/* ---------- 8. 导航 ---------- */
.masthead__navrow {
  position: relative;
  border-top: 1px solid var(--line);
}

.nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 4px 30px;
}

.nav__item { display: block; }

.nav__link {
  position: relative;
  display: inline-block;
  padding: 14px 2px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: rgba(242, 239, 230, 0.7);
  transition: color 0.18s var(--ease-hard);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--lime-400);
  transform: scaleX(0);
  transform-origin: 50% 50%;
  transition: transform 0.2s var(--ease-hard);
}

.nav__link:hover { color: var(--cream-100); }
.nav__link:hover::after { transform: scaleX(1); }

.nav__link[aria-current="page"] { color: var(--lime-400); }
.nav__link[aria-current="page"]::after { transform: scaleX(1); }

.masthead[data-stuck] .nav__link { padding: 11px 2px; }

/* ---------- 9. 移动导航按钮 ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 14px 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cream-100);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  transition: background-color 0.18s linear;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 22px;
  height: 2px;
  background: currentColor;
  transition: transform 0.2s var(--ease-hard), top 0.2s var(--ease-hard);
}

.nav-toggle__bars::before { top: -7px; }
.nav-toggle__bars::after { top: 7px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }

/* ---------- 10. 页脚 ---------- */
.site-foot {
  position: relative;
  margin-top: 96px;
  background: var(--char-900);
  border-top: 1px solid rgba(124, 135, 127, 0.22);
}

.site-foot::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--moss-700) 0%, var(--clay-500) 42%, var(--lime-400) 78%, var(--teal-800) 100%);
  opacity: 0.8;
}

.site-foot__inner {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
  gap: 44px 40px;
  padding: 64px 0 44px;
}

.foot-col { min-width: 0; }

.foot-brand {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--cream-100);
}

.foot-desc {
  margin-top: 14px;
  max-width: 34ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--text-soft);
}

.foot-stamp {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.11em;
  color: var(--stone-500);
}

.foot-title {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--clay-500);
}

.foot-list li + li { margin-top: 10px; }

.foot-list a {
  display: inline-block;
  font-size: 14.5px;
  color: var(--text-soft);
  transition: color 0.18s var(--ease-hard), transform 0.18s var(--ease-hard);
}

.foot-list a:hover,
.foot-list a:focus-visible { color: var(--lime-400); transform: translateX(3px); }

.foot-meta li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 14px;
  color: var(--text-soft);
}

.foot-meta li + li { margin-top: 12px; }

.foot-meta .mono {
  flex: 0 0 auto;
  min-width: 30px;
  font-size: 15px;
  font-weight: 700;
  color: var(--lime-400);
}

.foot-meta__key {
  flex: 0 0 auto;
  min-width: 36px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--stone-500);
}

.foot-meta__val {
  color: var(--text-soft);
  word-break: break-word;
}

.foot-meta--contact .foot-meta__val { font-size: 13.5px; }

.foot-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 26px;
  padding: 22px 0 30px;
  border-top: 1px solid rgba(124, 135, 127, 0.2);
}

.foot-bar__copy {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--stone-500);
}

.foot-bar__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
}

.foot-bar__links a {
  color: var(--text-soft);
  transition: color 0.18s var(--ease-hard);
}

.foot-bar__links a:hover,
.foot-bar__links a:focus-visible { color: var(--lime-400); }

.to-top {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 15px;
  border: 1px solid rgba(124, 135, 127, 0.32);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--stone-500);
  transition: color 0.18s var(--ease-hard), border-color 0.18s var(--ease-hard), transform 0.18s var(--ease-hard);
}

.to-top:hover,
.to-top:focus-visible {
  color: var(--lime-400);
  border-color: var(--lime-400);
  transform: translateY(-2px);
}

.to-top__mark { font-size: 13px; line-height: 1; }

/* ---------- 11. 面包屑 ---------- */
.breadcrumb { padding: 26px 0 0; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--stone-500);
}

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

.breadcrumb__list li::after {
  content: "/";
  margin-left: 8px;
  color: rgba(124, 135, 127, 0.45);
}

.breadcrumb__list li:last-child::after { content: ""; }

.breadcrumb__list a { color: var(--text-soft); transition: color 0.18s var(--ease-hard); }
.breadcrumb__list a:hover { color: var(--lime-400); }
.breadcrumb__list [aria-current="page"] { color: var(--clay-500); }

/* ---------- 12. 正文容器 ---------- */
.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--text-soft);
}

.prose > * + * { margin-top: 1.15em; }

.prose h2 {
  margin-top: 2.2em;
  font-size: clamp(24px, 3vw, 32px);
}

.prose h3 { margin-top: 1.8em; color: var(--cream-100); }

.prose strong { color: var(--cream-100); font-weight: 700; }

.prose a {
  color: var(--lime-400);
  border-bottom: 1px solid rgba(198, 241, 53, 0.42);
  transition: border-color 0.18s var(--ease-hard);
}

.prose a:hover { border-bottom-color: var(--lime-400); }

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

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

.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 8px;
  height: 2px;
  background: var(--clay-500);
}

.prose ol { padding-left: 1.3em; list-style: decimal; }
.prose ol li { padding-left: 0.2em; }
.prose ol li::marker { font-family: var(--font-mono); color: var(--lime-400); }

.prose blockquote {
  margin: 2em 0;
  padding: 2px 0 2px 22px;
  border-left: 2px solid var(--lime-400);
  font-size: 19px;
  color: var(--cream-100);
}

.prose hr { margin: 2.6em 0; }

.prose code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(46, 74, 60, 0.6);
  color: var(--lime-400);
}

/* ---------- 13. 栅格 ---------- */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}

.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; }

/* ---------- 14. 版块标题带 ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.section-head__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--clay-500);
}

.section-head__title {
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 900;
  letter-spacing: -0.025em;
  color: var(--cream-100);
}

.section-head__aside {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--stone-500);
}

/* ---------- 15. 数据指标 ---------- */
.stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime-400);
}

.stat__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.13em;
  color: var(--stone-500);
}

/* ---------- 16. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.09em;
  color: var(--text-soft);
  white-space: nowrap;
}

.tag--lime {
  background: var(--lime-pale);
  border-color: transparent;
  color: #0B1B16;
  font-weight: 700;
}

.tag--hot { border-color: rgba(255, 106, 43, 0.6); color: var(--orange-500); }
.tag--clay { border-color: rgba(201, 122, 82, 0.55); color: var(--clay-500); }

/* ---------- 17. 卡片 ---------- */
.card {
  position: relative;
  padding: 26px 24px 28px;
  border: 1px solid var(--line);
  border-radius: var(--r-organic);
  background: linear-gradient(160deg, rgba(46, 74, 60, 0.55), rgba(11, 27, 22, 0.62));
  transition: border-color 0.18s var(--ease-hard), transform 0.18s var(--ease-hard);
}

.card:hover,
.card:focus-within {
  border-color: rgba(198, 241, 53, 0.42);
  transform: translateY(-4px);
}

/* ---------- 18. 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  isolation: isolate;
  border: 1px solid var(--line);
  border-radius: var(--r-organic);
  background:
    radial-gradient(120% 90% at 16% 6%, rgba(198, 241, 53, 0.13), transparent 58%),
    linear-gradient(158deg, #1B3428 0%, #123A38 46%, #0B1B16 100%);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(242, 239, 230, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(242, 239, 230, 0.055) 1px, transparent 1px);
  background-size: 44px 44px;
}

.media-frame img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--band { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--free { aspect-ratio: auto; }

.media-frame__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  max-width: 100%;
  padding: 9px 16px;
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
  border-radius: 0 10px 0 0;
  background: rgba(11, 27, 22, 0.76);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--cream-200);
}

/* ---------- 19. 进入视口的显现（由 JS 添加类名） ---------- */
.reveal-pending {
  opacity: 0;
  transform: translate3d(0, 14px, 0);
  transition: opacity 0.5s var(--ease-hard), transform 0.5s var(--ease-hard);
}

.reveal-pending.is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 20. 断点 ---------- */
@media (max-width: 1024px) {
  .foot-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px 32px;
    padding: 52px 0 36px;
  }

  .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; }
}

@media (max-width: 900px) {
  .masthead__navrow {
    display: flex;
    justify-content: flex-end;
    border-top: 1px solid var(--line);
  }

  .nav { display: none; }
  .nav[data-open] { display: block; }

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

  .nav[data-open] .nav__list {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 130;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    max-height: 72vh;
    overflow-y: auto;
    padding: 8px var(--gutter) 18px;
    background: #0E211B;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 26px 44px -28px rgba(0, 0, 0, 0.95);
  }

  .nav[data-open] .nav__link {
    display: flex;
    justify-content: space-between;
    padding: 15px 0;
    border-bottom: 1px solid rgba(124, 135, 127, 0.16);
    font-size: 17px;
  }

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

  .nav[data-open] .nav__item:last-child .nav__link { border-bottom: 0; }

  .masthead[data-stuck] .nav__link { padding: 15px 0; }
}

@media (max-width: 767px) {
  :root { --gutter: 18px; }

  body { font-size: 16px; }

  .masthead__brandrow {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 12px;
    padding: 14px 0 8px;
  }

  .masthead__brand {
    grid-column: 1;
    justify-self: start;
    font-size: clamp(26px, 8.4vw, 34px);
  }

  .masthead__cta {
    grid-column: 2;
    justify-self: end;
    padding: 9px 14px;
    font-size: 12px;
  }

  .masthead__tagline { display: none; }

  .masthead__index {
    font-size: 10.5px;
    letter-spacing: 0.08em;
    gap: 6px 8px;
  }

  .masthead[data-stuck] .masthead__brand { font-size: clamp(22px, 7vw, 28px); }

  .foot-grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 44px 0 30px;
  }

  .foot-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .section-head__aside { margin-left: 0; }
}

@media (max-width: 640px) {
  .grid-12 { grid-template-columns: 1fr; gap: 18px; }
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9, .col-12 { grid-column: span 1; }
}

/* ---------- 21. 减弱动效 ---------- */
@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;
  }

  .masthead__dot { animation: none; opacity: 1; }

  .card:hover,
  .card:focus-within,
  .btn:hover,
  .to-top:hover { transform: none; }

  .reveal-pending {
    opacity: 1;
    transform: none;
    transition: none;
  }
}