/* ==========================================================================
   优德赛事 · 共享样式表 /assets/site.css
   主题：深夜赛场指挥中心 —— 墨绿夜色、荧光青冷光、炽热橙红脉冲
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--ud-header-h, 118px) + 16px);
}

body, h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, ol, ul { margin: 0; }
ol, ul { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
img, svg, video { display: block; max-width: 100%; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

/* 2. 设计令牌 ------------------------------------------------------------- */
:root {
  --ud-ink: #07211B;
  --ud-ink-2: #0E3128;
  --ud-line: #1B2A2E;
  --ud-cyan: #35F2C9;
  --ud-orange: #FF5A2B;
  --ud-amber: #FFC24B;
  --ud-white: #F2F7F5;
  --ud-steel: #8FA3B0;
  --ud-mute: #5C6E76;

  --ud-cyan-06: rgba(53, 242, 201, .06);
  --ud-cyan-16: rgba(53, 242, 201, .16);
  --ud-cyan-45: rgba(53, 242, 201, .45);
  --ud-orange-12: rgba(255, 90, 43, .12);
  --ud-orange-45: rgba(255, 90, 43, .45);

  --ud-font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", sans-serif;
  --ud-font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "DejaVu Sans Mono", "Courier New", monospace;

  --ud-shell: 1280px;
  --ud-gutter: clamp(16px, 4vw, 48px);
  --ud-gap: clamp(16px, 2.4vw, 32px);
  --ud-header-h: 118px;
  --ud-radius: 2px;
  --ud-ease: cubic-bezier(.2, .72, .28, 1);

  --ud-shadow-hard: 8px 8px 0 0 var(--ud-line);
  --ud-shadow-soft: 0 28px 60px -36px rgba(0, 0, 0, .95);
}

/* 3. 基础排版 ------------------------------------------------------------- */
body {
  min-height: 100vh;
  background-color: var(--ud-ink);
  background-image:
    radial-gradient(900px 520px at 4% -6%, rgba(53, 242, 201, .13), transparent 70%),
    radial-gradient(760px 460px at 98% 0%, rgba(255, 90, 43, .11), transparent 72%);
  background-repeat: no-repeat;
  color: var(--ud-white);
  font-family: var(--ud-font-sans);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

:focus-visible {
  outline: 2px solid var(--ud-cyan);
  outline-offset: 3px;
  border-radius: 1px;
}

::selection { background: var(--ud-cyan); color: #04170F; }

h1, h2, h3, h4 { font-weight: 800; line-height: 1.1; letter-spacing: -.005em; }

.ud-display {
  font-size: clamp(48px, 9vw, 160px);
  font-weight: 800;
  line-height: .92;
  letter-spacing: -.03em;
}
.ud-h1 { font-size: clamp(32px, 5vw, 64px); line-height: 1.05; letter-spacing: -.02em; }
.ud-h2 { font-size: clamp(26px, 3.4vw, 48px); line-height: 1.08; }
.ud-h3 { font-size: clamp(20px, 2vw, 24px); line-height: 1.25; }
.ud-lede { font-size: clamp(17px, 1.5vw, 20px); line-height: 1.7; color: #CFE0DB; max-width: 38em; }
.ud-quiet { color: var(--ud-steel); font-size: 14px; }
.ud-mono {
  font-family: var(--ud-font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
  font-size: .92em;
}
.ud-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--ud-font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--ud-cyan);
}
.ud-eyebrow::before { content: ""; width: 26px; height: 2px; background: var(--ud-orange); }

/* 4. 布局 ----------------------------------------------------------------- */
.ud-shell {
  width: 100%;
  max-width: var(--ud-shell);
  margin-inline: auto;
  padding-inline: var(--ud-gutter);
}

.ud-section { padding-block: clamp(40px, 6vw, 88px); }

.ud-section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 18px;
  border-bottom: 2px solid var(--ud-line);
  margin-bottom: clamp(20px, 3vw, 36px);
}
.ud-section__index {
  font-family: var(--ud-font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--ud-amber);
}

.ud-rule {
  height: 3px;
  border: 0;
  margin-block: clamp(28px, 4vw, 56px);
  background: linear-gradient(90deg, var(--ud-cyan), var(--ud-line) 45%, var(--ud-orange));
}

.ud-grid { display: grid; gap: var(--ud-gap); grid-template-columns: repeat(12, minmax(0, 1fr)); }
.ud-grid--7-3 > .ud-col-main { grid-column: span 8; }
.ud-grid--7-3 > .ud-col-side { grid-column: span 4; }
.ud-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.ud-underlay { margin-top: calc(var(--ud-header-h) * -1); }

[id="main-content"] { display: block; scroll-margin-top: calc(var(--ud-header-h) + 12px); }

/* 5. 按钮与标签 ----------------------------------------------------------- */
.ud-btn {
  --ud-btn-bg: transparent;
  --ud-btn-fg: var(--ud-white);
  --ud-btn-bd: var(--ud-line);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: .04em;
  background: var(--ud-btn-bg);
  color: var(--ud-btn-fg);
  border: 2px solid var(--ud-btn-bd);
  border-radius: var(--ud-radius);
  white-space: nowrap;
  transition: background-color .2s var(--ud-ease), color .2s var(--ud-ease),
              border-color .2s var(--ud-ease), transform .2s var(--ud-ease),
              box-shadow .2s var(--ud-ease);
}
.ud-btn:hover { transform: translateY(-2px); }
.ud-btn:active { transform: translateY(0); }

.ud-btn--solid { --ud-btn-bg: var(--ud-cyan); --ud-btn-fg: #04170F; --ud-btn-bd: var(--ud-cyan); }
.ud-btn--solid:hover { --ud-btn-bg: #63F7D8; box-shadow: 0 10px 26px -12px rgba(53, 242, 201, .7); }

.ud-btn--ghost { --ud-btn-fg: var(--ud-cyan); --ud-btn-bd: var(--ud-cyan-45); --ud-btn-bg: var(--ud-cyan-06); }
.ud-btn--ghost:hover { --ud-btn-bd: var(--ud-cyan); --ud-btn-bg: var(--ud-cyan-16); }

.ud-btn--hot { --ud-btn-bg: var(--ud-orange); --ud-btn-fg: #160404; --ud-btn-bd: var(--ud-orange); }

.ud-btn--sm { min-height: 38px; padding: 9px 14px; font-size: 13px; }
.ud-btn--block { width: 100%; }

.ud-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  font-family: var(--ud-font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ud-steel);
  background: rgba(14, 49, 40, .6);
  border: 1px solid var(--ud-line);
}
.ud-tag--cyan { color: var(--ud-cyan); border-color: var(--ud-cyan-45); background: var(--ud-cyan-06); }
.ud-tag--hot { color: var(--ud-orange); border-color: var(--ud-orange-45); background: var(--ud-orange-12); }
.ud-tag--amber { color: var(--ud-amber); border-color: rgba(255, 194, 75, .45); background: rgba(255, 194, 75, .10); }

/* 6. 头部 ----------------------------------------------------------------- */
.ud-skip {
  position: fixed;
  left: 12px;
  top: -72px;
  z-index: 300;
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 700;
  color: #04170F;
  background: var(--ud-cyan);
  border-radius: var(--ud-radius);
  transition: top .2s var(--ud-ease);
}
.ud-skip:focus { top: 12px; }

.ud-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color .24s var(--ud-ease), border-color .24s var(--ud-ease),
              box-shadow .24s var(--ud-ease);
}
.ud-header.is-stuck {
  background: rgba(7, 33, 27, .95);
  border-bottom-color: var(--ud-line);
  box-shadow: 0 22px 44px -30px #000;
}

.ud-header__top { position: relative; z-index: 2; }

.ud-header__inner {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  min-height: 68px;
  padding-block: 10px;
}

.ud-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  color: var(--ud-white);
}
.ud-brand__mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 2px solid var(--ud-cyan);
  background: var(--ud-cyan-06);
  transform: skewX(-8deg);
}
.ud-brand__dot {
  display: block;
  width: 10px;
  height: 10px;
  background: var(--ud-orange);
  box-shadow: 0 0 12px var(--ud-orange);
}
.ud-brand__stack { display: flex; flex-direction: column; line-height: 1.15; }
.ud-brand__name { font-size: 19px; font-weight: 800; letter-spacing: .02em; }
.ud-brand__sub {
  font-family: var(--ud-font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--ud-steel);
}
.ud-brand--footer .ud-brand__mark { width: 40px; height: 40px; }
.ud-brand--footer .ud-brand__name { font-size: 21px; }

.ud-ticker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
  padding-left: 16px;
  margin-left: 4px;
  font-size: 12px;
  color: var(--ud-steel);
  border-left: 1px solid var(--ud-line);
}
.ud-ticker__key {
  padding: 2px 6px;
  font-family: var(--ud-font-mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--ud-orange);
  border: 1px solid var(--ud-orange-45);
  background: var(--ud-orange-12);
}
.ud-ticker__text { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.ud-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}
.ud-header__cta { flex: 0 0 auto; }

/* 7. 导航索引轨 ----------------------------------------------------------- */
.ud-nav {
  position: relative;
  z-index: 1;
  background: linear-gradient(180deg, rgba(14, 49, 40, .55), rgba(7, 33, 27, .12));
  border-top: 1px solid var(--ud-line);
}
.ud-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 2px;
}
.ud-nav__list { display: flex; flex-wrap: wrap; gap: 2px; }
.ud-nav__item { display: block; }

.ud-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 12px 14px;
  font-size: 15px;
  color: var(--ud-white);
  border-bottom: 2px solid transparent;
  transition: color .18s var(--ud-ease), background-color .18s var(--ud-ease),
              border-color .18s var(--ud-ease);
}
.ud-nav__link:hover { color: var(--ud-cyan); background: var(--ud-cyan-06); }
.ud-nav__idx {
  font-family: var(--ud-font-mono);
  font-size: 10px;
  letter-spacing: .12em;
  color: var(--ud-steel);
}
.ud-nav__label { font-weight: 500; }
.ud-nav__link[aria-current="page"] {
  color: var(--ud-cyan);
  background: var(--ud-cyan-06);
  border-bottom-color: var(--ud-orange);
}
.ud-nav__link[aria-current="page"] .ud-nav__idx { color: var(--ud-orange); }

.ud-nav__meta {
  font-family: var(--ud-font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  color: var(--ud-mute);
  white-space: nowrap;
}

/* 8. 汉堡按钮与阅读进度 --------------------------------------------------- */
.ud-burger {
  display: none;
  align-items: center;
  gap: 8px;
  min-height: 38px;
  padding: 8px 10px;
  font-size: 12px;
  color: var(--ud-white);
  border: 2px solid var(--ud-line);
  border-radius: var(--ud-radius);
  transition: border-color .2s var(--ud-ease), background-color .2s var(--ud-ease);
}
.ud-burger:hover { border-color: var(--ud-cyan-45); background: var(--ud-cyan-06); }
.ud-burger__bars { display: inline-flex; flex-direction: column; gap: 3px; }
.ud-burger__bars span {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--ud-white);
  transition: transform .2s var(--ud-ease), opacity .2s var(--ud-ease);
}
.ud-burger__label { font-family: var(--ud-font-mono); letter-spacing: .12em; }

.ud-burger[aria-expanded="true"] { border-color: var(--ud-cyan); color: var(--ud-cyan); }
.ud-burger[aria-expanded="true"] .ud-burger__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.ud-burger[aria-expanded="true"] .ud-burger__bars span:nth-child(2) { opacity: 0; }
.ud-burger[aria-expanded="true"] .ud-burger__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

.ud-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: rgba(53, 242, 201, .12);
  overflow: hidden;
}
.ud-progress__fill {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--ud-cyan), var(--ud-orange));
  transition: width .12s linear;
}

/* 9. 页脚 ----------------------------------------------------------------- */
.ud-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 128px);
  background: linear-gradient(180deg, var(--ud-ink-2), #061A16 78%);
  border-top: 3px solid var(--ud-cyan);
}

.ud-footer__top {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.7fr);
  gap: clamp(28px, 4vw, 64px);
  padding-block: clamp(36px, 5vw, 72px);
}

.ud-footer__brand { display: flex; flex-direction: column; align-items: flex-start; gap: 18px; }
.ud-footer__line { font-size: 15px; color: #C3D6D0; max-width: 34em; }
.ud-footer__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  font-size: 13px;
  color: var(--ud-steel);
}
.ud-footer__k {
  font-family: var(--ud-font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--ud-mute);
}

.ud-footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}

.ud-footer__heading {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  font-size: 14px;
  font-weight: 800;
  color: var(--ud-white);
  border-bottom: 2px solid var(--ud-line);
}
.ud-footer__idx {
  font-family: var(--ud-font-mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--ud-amber);
}

.ud-footer__list li + li { margin-top: 9px; }
.ud-footer__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--ud-steel);
  transition: color .18s var(--ud-ease), transform .18s var(--ud-ease);
}
.ud-footer__list a::before {
  content: "";
  width: 10px;
  height: 1px;
  background: var(--ud-mute);
  transition: width .18s var(--ud-ease), background-color .18s var(--ud-ease);
}
.ud-footer__list a:hover { color: var(--ud-cyan); transform: translateX(2px); }
.ud-footer__list a:hover::before { width: 18px; background: var(--ud-cyan); }

.ud-footer__contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 18px 24px;
  padding-block: 24px;
  border-top: 1px solid var(--ud-line);
  border-bottom: 1px solid var(--ud-line);
}
.ud-footer__cell { display: flex; flex-direction: column; gap: 4px; }
.ud-footer__v { font-size: 14px; color: var(--ud-white); word-break: break-word; }

.ud-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  padding-block: 20px 28px;
  font-size: 13px;
  color: var(--ud-steel);
}
.ud-footer__legal { font-family: var(--ud-font-mono); font-size: 12px; color: var(--ud-mute); }
.ud-footer__copy { font-size: 13px; }
.ud-footer__legal-links { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.ud-footer__legal-links a { color: var(--ud-steel); transition: color .18s var(--ud-ease); }
.ud-footer__legal-links a:hover { color: var(--ud-cyan); }

/* 10. 通用组件 ------------------------------------------------------------ */
.ud-card {
  position: relative;
  padding: clamp(18px, 2vw, 28px);
  background: var(--ud-ink-2);
  border: 2px solid var(--ud-line);
  border-radius: var(--ud-radius);
  transition: border-color .2s var(--ud-ease), transform .2s var(--ud-ease),
              box-shadow .2s var(--ud-ease);
}
.ud-card:hover {
  border-color: var(--ud-cyan-45);
  transform: translateY(-3px);
  box-shadow: var(--ud-shadow-soft);
}
.ud-card--flat:hover { transform: none; box-shadow: none; border-color: var(--ud-line); }
.ud-card--hot { border-color: var(--ud-orange-45); }
.ud-card__label {
  font-family: var(--ud-font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--ud-amber);
}
.ud-card__title { margin-top: 10px; font-size: clamp(19px, 1.7vw, 23px); font-weight: 800; }
.ud-card__text { margin-top: 10px; font-size: 15px; color: #C3D6D0; }
.ud-card__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--ud-line);
}

.ud-index-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--ud-line);
  transition: background-color .2s var(--ud-ease), padding-left .2s var(--ud-ease);
}
.ud-index-row:hover { background: var(--ud-cyan-06); padding-left: 10px; }
.ud-index-row__num { font-family: var(--ud-font-mono); font-size: 12px; color: var(--ud-amber); }
.ud-index-row__label { font-weight: 700; }
.ud-index-row__meta { font-family: var(--ud-font-mono); font-size: 12px; color: var(--ud-steel); }

.ud-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 16px;
  font-family: var(--ud-font-mono);
  font-size: 12px;
  color: var(--ud-steel);
}
.ud-breadcrumb a { color: var(--ud-steel); transition: color .18s var(--ud-ease); }
.ud-breadcrumb a:hover { color: var(--ud-cyan); }
.ud-breadcrumb__sep { color: var(--ud-mute); }
.ud-breadcrumb [aria-current="page"] { color: var(--ud-white); }

.ud-prose { max-width: 38em; }
.ud-prose p { margin-bottom: 1.1em; color: #CFE0DB; }
.ud-prose h2 { margin: 2em 0 .6em; font-size: clamp(22px, 2.6vw, 32px); }
.ud-prose h3 { margin: 1.6em 0 .5em; font-size: 20px; }
.ud-prose ul, .ud-prose ol { margin-bottom: 1.2em; }
.ud-prose li { position: relative; margin-bottom: .55em; padding-left: 20px; color: #CFE0DB; }
.ud-prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: 8px;
  height: 2px;
  background: var(--ud-orange);
}
.ud-prose strong { color: var(--ud-white); }

/* 图像容器：页面阶段放置占位图或真实图 */
.ud-media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: var(--ud-ink-2);
  background-image:
    linear-gradient(135deg, rgba(53, 242, 201, .10), rgba(255, 90, 43, .10)),
    repeating-linear-gradient(90deg, rgba(143, 163, 176, .10) 0 1px, transparent 1px 28px);
  border: 2px solid var(--ud-line);
  border-radius: var(--ud-radius);
}
.ud-media > img { width: 100%; height: 100%; object-fit: cover; }
.ud-media--wide { aspect-ratio: 21 / 9; }
.ud-media--4x3 { aspect-ratio: 4 / 3; }
.ud-media--1x1 { aspect-ratio: 1 / 1; }
.ud-media--3x4 { aspect-ratio: 3 / 4; }
.ud-media__caption {
  margin-top: 10px;
  font-family: var(--ud-font-mono);
  font-size: 12px;
  color: var(--ud-steel);
}
.ud-figure { display: block; }

/* 标签切换 */
.ud-tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: clamp(18px, 2.4vw, 28px);
  border-bottom: 2px solid var(--ud-line);
}
.ud-tabs__btn {
  margin-bottom: -2px;
  padding: 10px 14px;
  font-family: var(--ud-font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--ud-steel);
  background: transparent;
  border: 2px solid transparent;
  border-bottom: 0;
  transition: color .2s var(--ud-ease), background-color .2s var(--ud-ease),
              border-color .2s var(--ud-ease);
}
.ud-tabs__btn:hover { color: var(--ud-white); background: var(--ud-cyan-06); }
.ud-tabs__btn.is-active {
  color: #04170F;
  background: var(--ud-cyan);
  border-color: var(--ud-cyan);
}
.ud-tabs__panel { padding-top: 4px; }

/* 可展开内容组（原生 details） */
.ud-accordion {
  background: var(--ud-ink-2);
  border: 2px solid var(--ud-line);
  border-radius: var(--ud-radius);
  transition: border-color .2s var(--ud-ease);
}
.ud-accordion + .ud-accordion { margin-top: -2px; }
.ud-accordion summary {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 20px;
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}
.ud-accordion summary::-webkit-details-marker { display: none; }
.ud-accordion summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--ud-font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--ud-cyan);
}
.ud-accordion[open] { border-color: var(--ud-cyan-45); }
.ud-accordion[open] summary::after { content: "−"; color: var(--ud-orange); }
.ud-accordion__body { padding: 0 20px 20px; font-size: 15px; color: #C3D6D0; }

/* 滚动显现 */
.ud-reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .5s var(--ud-ease), transform .5s var(--ud-ease);
}
.ud-reveal.is-visible { opacity: 1; transform: none; }

/* 11. 响应式 -------------------------------------------------------------- */
@media (max-width: 1100px) {
  .ud-grid--7-3 > .ud-col-main { grid-column: span 12; }
  .ud-grid--7-3 > .ud-col-side { grid-column: span 12; }
  .ud-grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 1000px) {
  :root { --ud-header-h: 68px; }

  .ud-header__inner { min-height: 60px; padding-block: 4px; }
  .ud-ticker { display: none; }

  .ud-burger { display: inline-flex; }

  .ud-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: calc(100vh - var(--ud-header-h));
    overflow-y: auto;
    background: rgba(7, 33, 27, .98);
    border-top: 1px solid var(--ud-line);
    box-shadow: 0 30px 60px -30px #000;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-10px);
    transition: opacity .2s var(--ud-ease), transform .2s var(--ud-ease), visibility .2s;
  }
  .ud-nav[data-open] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }
  .ud-nav__inner {
    flex-direction: column;
    align-items: stretch;
    padding-block: 10px 18px;
  }
  .ud-nav__list { flex-direction: column; gap: 0; }
  .ud-nav__link {
    width: 100%;
    padding: 14px 4px;
    font-size: 16px;
    border-bottom: 2px solid transparent;
  }
  .ud-nav__link[aria-current="page"] {
    border-bottom-color: transparent;
    border-left: 3px solid var(--ud-orange);
    padding-left: 12px;
  }
  .ud-nav__meta { padding-top: 12px; border-top: 1px solid var(--ud-line); }
}

@media (max-width: 900px) {
  .ud-footer__top { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 720px) {
  .ud-header__cta--ghost { display: none; }
  .ud-brand__sub { display: none; }
  .ud-btn--sm { min-height: 36px; padding: 8px 12px; font-size: 12px; }
  .ud-burger__label { display: none; }
  .ud-grid--3 { grid-template-columns: minmax(0, 1fr); }
  .ud-section__head { align-items: flex-start; }
}

@media (max-width: 620px) {
  .ud-footer__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
  .ud-footer__bottom { flex-direction: column; align-items: flex-start; }
  .ud-index-row { grid-template-columns: auto minmax(0, 1fr); }
  .ud-index-row__meta { grid-column: 2; }
}

/* 12. 动效偏好 ------------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .ud-reveal { opacity: 1; transform: none; }
  .ud-btn:hover { transform: none; }
  .ud-card:hover { transform: none; }
}