/* ==========================================================================
   云体育 · 中国官方主站 —— 共享样式 /assets/site.css
   顺序：reset → 变量 → 中文排版 → 页头 → 页脚 → 通用组件 → 响应式 → 无障碍
   ========================================================================== */

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

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

body { margin: 0; }

h1, h2, h3, h4, h5, p, figure, blockquote { margin: 0; }

ul, ol { margin: 0; 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; }

/* ---------- 2. 变量 ---------- */
:root {
  --ys-night: #0B1B2B;
  --ys-indigo: #16324F;
  --ys-indigo-deep: #0E2135;
  --ys-pitch: #1E9E5A;
  --ys-pitch-bright: #46E08A;
  --ys-red: #D0342C;
  --ys-gold: #E0A93B;
  --ys-yellow: #F2C230;
  --ys-cyan: #37D6C9;
  --ys-purple: #7C5CE0;
  --ys-paper: #F3EFE6;
  --ys-fog: #9DA9B6;

  --ys-text: #F3EFE6;
  --ys-text-dim: #B9C4D0;

  --ys-line: rgba(224, 169, 59, 0.42);
  --ys-line-soft: rgba(157, 169, 182, 0.26);
  --ys-line-dark: rgba(11, 27, 43, 0.16);

  --ys-font-display: "PingFang SC", "Noto Sans SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --ys-font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --ys-header-h: 84px;
  --ys-max: 1240px;
  --ys-gutter: clamp(18px, 4vw, 48px);

  --ys-shadow-panel: 0 20px 42px -26px rgba(0, 0, 0, 0.78);
  --ys-shadow-lift: 0 24px 46px -22px rgba(0, 0, 0, 0.86);
  --ys-ease: 160ms cubic-bezier(0.2, 0.7, 0.3, 1);
  --ys-focus: 0 0 0 2px var(--ys-night), 0 0 0 4px var(--ys-cyan);
}

/* ---------- 3. 中文排版与基础底色 ---------- */
html {
  scroll-padding-top: calc(var(--ys-header-h) + 20px);
}

body {
  background-color: var(--ys-night);
  background-image:
    radial-gradient(120% 78% at 78% -12%, rgba(30, 158, 90, 0.20), rgba(11, 27, 43, 0) 62%),
    radial-gradient(94% 62% at 6% 0%, rgba(124, 92, 224, 0.15), rgba(11, 27, 43, 0) 64%);
  background-repeat: no-repeat;
  color: var(--ys-text);
  font-family: var(--ys-font-display);
  font-size: clamp(16px, 0.35vw + 15px, 17px);
  line-height: 1.8;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

#main-content { display: block; }

:focus-visible {
  outline: 2px solid var(--ys-cyan);
  outline-offset: 2px;
}

::selection {
  background: var(--ys-pitch);
  color: var(--ys-night);
}

/* 排版构件 */
.ys-display {
  font-family: var(--ys-font-display);
  font-weight: 300;
  font-size: clamp(40px, 7vw, 104px);
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.ys-section-title {
  font-size: clamp(24px, 3vw, 40px);
  font-weight: 600;
  line-height: 1.24;
  letter-spacing: -0.01em;
}

.ys-score {
  font-family: var(--ys-font-mono);
  font-weight: 700;
  font-size: clamp(32px, 5vw, 72px);
  line-height: 1;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}

.ys-num {
  font-family: var(--ys-font-mono);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.ys-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ys-gold);
}

.ys-eyebrow--dim { color: var(--ys-fog); }

.ys-lede {
  max-width: 62ch;
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.85;
  color: #D8E0E8;
}

.ys-note {
  padding-left: 14px;
  border-left: 2px solid var(--ys-purple);
  font-size: 14px;
  line-height: 1.78;
  color: var(--ys-text-dim);
}

.ys-rule {
  height: 1px;
  margin: 0;
  border: 0;
  background: var(--ys-line-soft);
}

.ys-gap {
  display: inline-block;
  width: 4px;
  height: 1px;
  overflow: hidden;
}

/* ---------- 4. 页头 ---------- */
.ys-skip {
  position: absolute;
  top: -80px;
  left: 16px;
  z-index: 220;
  padding: 10px 18px;
  background: var(--ys-paper);
  color: var(--ys-night);
  font-size: 14px;
  font-weight: 600;
  border: 1px solid var(--ys-gold);
  transition: top var(--ys-ease);
}

.ys-skip:focus { top: 12px; }

.ys-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 120;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}

.ys-header[data-scrolled] {
  background: rgba(11, 27, 43, 0.95);
  -webkit-backdrop-filter: blur(10px) saturate(140%);
  backdrop-filter: blur(10px) saturate(140%);
  border-bottom-color: var(--ys-line);
  box-shadow: 0 20px 36px -30px rgba(0, 0, 0, 0.95);
}

.ys-header__glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(11, 27, 43, 0.86) 0%, rgba(11, 27, 43, 0.46) 62%, rgba(11, 27, 43, 0) 100%);
  opacity: 1;
  transition: opacity 220ms ease;
}

.ys-header[data-scrolled] .ys-header__glow { opacity: 0; }

.ys-header__inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 18px;
  max-width: var(--ys-max);
  min-height: var(--ys-header-h);
  margin: 0 auto;
  padding: 0 var(--ys-gutter);
}

.ys-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 6px 2px;
  color: var(--ys-paper);
}

.ys-brand__mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  font-size: 18px;
  font-weight: 600;
  color: var(--ys-night);
  background: linear-gradient(140deg, var(--ys-pitch-bright), var(--ys-pitch) 60%, var(--ys-cyan));
  border: 1px solid rgba(243, 239, 230, 0.34);
  box-shadow: 3px 3px 0 -1px rgba(224, 169, 59, 0.6);
}

.ys-brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.ys-brand__name {
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.ys-brand__suffix {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--ys-gold);
}

/* 导航 */
.ys-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  min-width: 0;
}

.ys-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-wrap: wrap;
}

.ys-nav__link {
  position: relative;
  display: block;
  padding: 12px 12px;
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ys-text-dim);
  transition: color var(--ys-ease);
}

.ys-nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  background: var(--ys-gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--ys-ease);
  box-shadow: 0 4px 0 -1px rgba(224, 169, 59, 0.42), 0 8px 0 -3px rgba(224, 169, 59, 0.2);
}

.ys-nav__link:hover { color: var(--ys-paper); }

.ys-nav__link:hover::after { transform: scaleX(1); }

.ys-nav__link:focus-visible {
  outline: none;
  color: var(--ys-paper);
  box-shadow: var(--ys-focus);
}

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

.ys-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--ys-cyan);
  box-shadow: 0 4px 0 -1px rgba(55, 214, 201, 0.45);
}

/* 页头右上常驻区 */
.ys-header__utility {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
  margin-left: auto;
}

.ys-header__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 11px;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  white-space: nowrap;
  color: var(--ys-paper);
  background: rgba(30, 158, 90, 0.16);
  border: 1px solid rgba(70, 224, 138, 0.42);
  border-left: 3px solid var(--ys-pitch-bright);
}

.ys-header__badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ys-yellow);
  box-shadow: 0 0 0 3px rgba(242, 194, 48, 0.22);
}

/* 移动导航按钮 */
.ys-nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--ys-paper);
  background: rgba(22, 50, 79, 0.72);
  border: 1px solid var(--ys-line);
}

.ys-nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

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

.ys-nav-toggle[aria-expanded="true"] .ys-nav-toggle__bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.ys-nav-toggle[aria-expanded="true"] .ys-nav-toggle__bars span:nth-child(2) { opacity: 0; }
.ys-nav-toggle[aria-expanded="true"] .ys-nav-toggle__bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.ys-nav-toggle:focus-visible {
  outline: none;
  box-shadow: var(--ys-focus);
}

/* 阅读进度 */
.ys-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  overflow: hidden;
  background: rgba(157, 169, 182, 0.14);
  pointer-events: none;
}

.ys-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--ys-pitch), var(--ys-pitch-bright) 55%, var(--ys-cyan));
}

/* ---------- 5. 页脚 ---------- */
.ys-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  color: var(--ys-text-dim);
  background: linear-gradient(180deg, var(--ys-night) 0%, #08131F 68%, #060E18 100%);
  border-top: 1px solid var(--ys-line);
}

.ys-footer__rail {
  height: 8px;
  border-bottom: 1px solid rgba(224, 169, 59, 0.24);
  background-image: repeating-linear-gradient(90deg, rgba(224, 169, 59, 0.85) 0 18px, rgba(224, 169, 59, 0) 18px 38px);
}

.ys-footer__inner {
  padding-top: clamp(40px, 6vw, 72px);
  padding-bottom: clamp(26px, 3vw, 40px);
}

.ys-footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(2, minmax(0, 0.8fr)) minmax(0, 1.25fr);
  gap: clamp(24px, 3vw, 44px);
}

.ys-footer__col { min-width: 0; }

.ys-footer__brand {
  font-size: clamp(17px, 1.8vw, 21px);
  font-weight: 600;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--ys-paper);
}

.ys-footer__note {
  margin-top: 16px;
  padding-left: 12px;
  border-left: 2px solid var(--ys-pitch);
  font-size: 13px;
  line-height: 1.8;
  color: var(--ys-fog);
}

.ys-footer__title {
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--ys-gold);
}

.ys-footer__list {
  display: grid;
  gap: 9px;
}

.ys-footer__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: var(--ys-text-dim);
  transition: color var(--ys-ease), transform var(--ys-ease);
}

.ys-footer__link::before {
  content: "";
  width: 10px;
  height: 1px;
  background: var(--ys-gold);
  opacity: 0.55;
  transition: width var(--ys-ease), background-color var(--ys-ease), opacity var(--ys-ease);
}

.ys-footer__link:hover {
  color: var(--ys-cyan);
  transform: translateX(2px);
}

.ys-footer__link:hover::before {
  width: 16px;
  opacity: 1;
  background: var(--ys-cyan);
}

.ys-footer__link:focus-visible {
  outline: none;
  box-shadow: var(--ys-focus);
}

.ys-footer__contact {
  display: grid;
  gap: 10px;
}

.ys-footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  line-height: 1.72;
}

.ys-footer__contact-key {
  flex: 0 0 auto;
  min-width: 64px;
  padding-top: 3px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ys-gold);
}

.ys-footer__cta { margin-top: 18px; }

.ys-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding-top: 18px;
  padding-bottom: 30px;
  border-top: 1px solid var(--ys-line-soft);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ys-fog);
}

.ys-footer__copy { font-variant-numeric: tabular-nums; }

.ys-footer__filing {
  padding: 3px 10px;
  border: 1px solid var(--ys-line-soft);
  color: var(--ys-text-dim);
}

/* ---------- 6. 通用组件 ---------- */
.ys-container {
  width: 100%;
  max-width: var(--ys-max);
  margin: 0 auto;
  padding-left: var(--ys-gutter);
  padding-right: var(--ys-gutter);
}

.ys-band {
  position: relative;
  padding: clamp(56px, 8vw, 112px) 0;
}

.ys-band--lead { padding-top: calc(var(--ys-header-h) + clamp(48px, 7vw, 96px)); }

.ys-band--tight { padding: clamp(36px, 5vw, 64px) 0; }

.ys-band--bleed { padding-top: 0; }

.ys-band--indigo {
  background: linear-gradient(180deg, rgba(22, 50, 79, 0.92), rgba(11, 27, 43, 0.6));
}

.ys-band--paper {
  background: var(--ys-paper);
  color: var(--ys-night);
}

.ys-band--paper .ys-eyebrow { color: #8A6414; }
.ys-band--paper .ys-text-dim,
.ys-band--paper .ys-note { color: #46586B; }

.ys-band__rule {
  height: 1px;
  background: linear-gradient(90deg, rgba(224, 169, 59, 0) 0%, var(--ys-line) 12%, var(--ys-line) 88%, rgba(224, 169, 59, 0) 100%);
}

.ys-text-dim { color: var(--ys-text-dim); }

/* 叠层画板 */
.ys-panel {
  position: relative;
  padding: clamp(22px, 3vw, 36px);
  background: linear-gradient(180deg, rgba(22, 50, 79, 0.94), rgba(11, 27, 43, 0.94));
  border: 1px solid var(--ys-line);
  box-shadow: 6px 6px 0 -1px rgba(224, 169, 59, 0.18), 12px 12px 0 -2px rgba(22, 50, 79, 0.62), var(--ys-shadow-panel);
}

.ys-panel--flat {
  background: var(--ys-indigo);
  box-shadow: none;
}

.ys-panel--paper {
  background: var(--ys-paper);
  color: var(--ys-night);
  border-color: var(--ys-line-dark);
  box-shadow: 6px 6px 0 -1px rgba(224, 169, 59, 0.55), 12px 12px 0 -2px rgba(11, 27, 43, 0.14), var(--ys-shadow-panel);
}

.ys-panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 14px 24px;
  margin-bottom: 20px;
}

/* 网格 */
.ys-grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.ys-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.ys-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.ys-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.ys-grid--asym { grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); }

/* 数据卡 */
.ys-card {
  position: relative;
  padding: 20px 20px 22px;
  background: rgba(11, 27, 43, 0.74);
  border: 1px solid var(--ys-line-soft);
  transition: transform var(--ys-ease), box-shadow var(--ys-ease), border-color var(--ys-ease);
}

.ys-card:hover,
.ys-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--ys-gold);
  box-shadow: var(--ys-shadow-lift);
}

.ys-card--wide { grid-column: span 2; }

.ys-card--tall { grid-row: span 2; }

.ys-card--paper {
  background: var(--ys-paper);
  color: var(--ys-night);
  border-color: var(--ys-line-dark);
}

.ys-card__corner {
  position: absolute;
  top: -1px;
  right: -1px;
  padding: 4px 10px;
  font-family: var(--ys-font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--ys-night);
  background: var(--ys-gold);
}

.ys-card__corner--red { background: var(--ys-red); color: var(--ys-paper); }
.ys-card__corner--yellow { background: var(--ys-yellow); }
.ys-card__corner--cyan { background: var(--ys-cyan); }
.ys-card__corner--purple { background: var(--ys-purple); color: var(--ys-paper); }

/* 标签 */
.ys-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ys-text-dim);
  background: rgba(22, 50, 79, 0.55);
  border: 1px solid var(--ys-line-soft);
}

.ys-tag--red { color: var(--ys-paper); background: rgba(208, 52, 44, 0.24); border-color: rgba(208, 52, 44, 0.7); }
.ys-tag--yellow { color: var(--ys-night); background: var(--ys-yellow); border-color: var(--ys-yellow); }
.ys-tag--gold { color: var(--ys-night); background: var(--ys-gold); border-color: var(--ys-gold); }
.ys-tag--cyan { color: var(--ys-night); background: var(--ys-cyan); border-color: var(--ys-cyan); }
.ys-tag--purple { color: var(--ys-paper); background: rgba(124, 92, 224, 0.32); border-color: rgba(124, 92, 224, 0.7); }
.ys-tag--paper { color: var(--ys-night); background: var(--ys-paper); border-color: var(--ys-line-dark); }

/* 按钮 */
.ys-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ys-paper);
  background: var(--ys-indigo);
  border: 1px solid var(--ys-line);
  transition: transform var(--ys-ease), box-shadow var(--ys-ease), background-color var(--ys-ease), color var(--ys-ease), border-color var(--ys-ease);
}

.ys-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--ys-shadow-lift);
}

.ys-btn:focus-visible {
  outline: none;
  box-shadow: var(--ys-focus);
}

.ys-btn--gold {
  color: var(--ys-night);
  background: linear-gradient(120deg, var(--ys-gold), #C98F26);
  border-color: rgba(11, 27, 43, 0.28);
}

.ys-btn--gold:hover { background: linear-gradient(120deg, #F0BD57, var(--ys-gold)); }

.ys-btn--ghost {
  background: transparent;
  color: var(--ys-paper);
  border-color: rgba(243, 239, 230, 0.34);
}

.ys-btn--ghost:hover { border-color: var(--ys-gold); color: var(--ys-gold); }

.ys-btn--cyan {
  background: transparent;
  color: var(--ys-cyan);
  border-color: rgba(55, 214, 201, 0.5);
}

.ys-btn--cyan:hover { background: rgba(55, 214, 201, 0.12); }

.ys-btn--sm {
  padding: 9px 15px;
  font-size: 13px;
  letter-spacing: 0.1em;
}

/* 面包屑 */
.ys-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ys-fog);
}

.ys-breadcrumb__link {
  padding-bottom: 2px;
  color: var(--ys-fog);
  border-bottom: 1px solid transparent;
  transition: color var(--ys-ease), border-color var(--ys-ease);
}

.ys-breadcrumb__link:hover {
  color: var(--ys-cyan);
  border-bottom-color: var(--ys-cyan);
}

.ys-breadcrumb__sep { color: rgba(157, 169, 182, 0.5); }

.ys-breadcrumb__current { color: var(--ys-paper); }

/* 横向轮次时间轴 */
.ys-timeline {
  display: flex;
  gap: 10px;
  padding: 14px 0;
  overflow-x: auto;
  border-top: 1px solid var(--ys-line-soft);
  border-bottom: 1px solid var(--ys-line-soft);
  scrollbar-width: thin;
  scrollbar-color: var(--ys-gold) rgba(22, 50, 79, 0.6);
}

.ys-timeline:focus-visible {
  outline: 2px solid var(--ys-cyan);
  outline-offset: 4px;
}

.ys-timeline__item { flex: 0 0 auto; }

.ys-timeline__link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 9px 15px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ys-text-dim);
  background: rgba(22, 50, 79, 0.5);
  border: 1px solid var(--ys-line-soft);
  transition: color var(--ys-ease), border-color var(--ys-ease), background-color var(--ys-ease), transform var(--ys-ease);
}

.ys-timeline__link:hover {
  color: var(--ys-paper);
  border-color: var(--ys-gold);
  transform: translateY(-2px);
}

.ys-timeline__link:focus-visible {
  outline: none;
  box-shadow: var(--ys-focus);
}

.ys-timeline__link[aria-current="true"] {
  color: var(--ys-night);
  background: var(--ys-yellow);
  border-color: var(--ys-yellow);
}

/* 档案抽屉 */
.ys-drawer {
  background: rgba(22, 50, 79, 0.44);
  border: 1px solid var(--ys-line-soft);
  border-left: 3px solid var(--ys-gold);
  transition: background-color var(--ys-ease), border-color var(--ys-ease);
}

.ys-drawer[open] {
  background: rgba(22, 50, 79, 0.72);
  border-left-color: var(--ys-cyan);
}

.ys-drawer__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}

.ys-drawer__head::-webkit-details-marker { display: none; }

.ys-drawer__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--ys-font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--ys-gold);
}

.ys-drawer[open] .ys-drawer__head::after {
  content: "\2013";
  color: var(--ys-cyan);
}

.ys-drawer__head:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--ys-cyan);
}

.ys-drawer__body {
  padding: 14px 18px 18px;
  border-top: 1px solid var(--ys-line-soft);
  font-size: 15px;
  color: var(--ys-text-dim);
}

.ys-drawer[open] .ys-drawer__body {
  animation: ys-drawer-in 160ms ease both;
}

@keyframes ys-drawer-in {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: none; }
}

/* 图片容器（页面阶段放置实拍图与插画） */
.ys-media {
  position: relative;
  display: block;
  overflow: hidden;
  background: linear-gradient(140deg, var(--ys-indigo), var(--ys-night));
  border: 1px solid var(--ys-line-soft);
}

.ys-media--empty {
  background-image: repeating-linear-gradient(135deg, rgba(224, 169, 59, 0.14) 0 8px, rgba(0, 0, 0, 0) 8px 16px);
}

.ys-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(11, 27, 43, 0) 42%, rgba(11, 27, 43, 0.78) 100%);
}

.ys-media--plain::after { display: none; }

.ys-media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.94) contrast(1.04);
}

.ys-media__label {
  position: absolute;
  left: 12px;
  bottom: 10px;
  z-index: 2;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ys-paper);
}

.ys-media--16x9 { aspect-ratio: 16 / 9; }
.ys-media--4x3 { aspect-ratio: 4 / 3; }
.ys-media--3x2 { aspect-ratio: 3 / 2; }
.ys-media--1x1 { aspect-ratio: 1 / 1; }
.ys-media--3x4 { aspect-ratio: 3 / 4; }

/* 滚动显现 */
.ys-js .ys-reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 420ms ease, transform 420ms ease;
}

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

/* ---------- 7. 响应式 ---------- */
@media (max-width: 1200px) {
  .ys-header__badge { display: none; }
}

@media (max-width: 1024px) {
  :root { --ys-header-h: 64px; }

  .ys-header__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 12px;
  }

  .ys-brand__mark { width: 34px; height: 34px; font-size: 16px; }
  .ys-brand__name { font-size: 17px; }
  .ys-brand__suffix { font-size: 10px; letter-spacing: 0.14em; }

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

  .ys-nav {
    position: absolute;
    top: 100%;
    left: calc(var(--ys-gutter) * -1);
    right: calc(var(--ys-gutter) * -1);
    display: block;
    gap: 0;
    max-height: 0;
    overflow: hidden;
    visibility: hidden;
    opacity: 0;
    background: rgba(11, 27, 43, 0.985);
    border-top: 1px solid var(--ys-line);
    border-bottom: 1px solid var(--ys-line);
    box-shadow: 0 28px 44px -30px rgba(0, 0, 0, 0.95);
    transition: max-height 240ms ease, opacity 180ms ease, visibility 180ms ease;
  }

  .ys-nav[data-open] {
    max-height: min(78vh, 620px);
    overflow-y: auto;
    visibility: visible;
    opacity: 1;
  }

  .ys-nav__list {
    display: block;
    padding: 6px 0;
  }

  .ys-nav__item { border-bottom: 1px dashed rgba(157, 169, 182, 0.16); }
  .ys-nav__item:last-child { border-bottom: 0; }

  .ys-nav__link {
    padding: 15px var(--ys-gutter);
    font-size: 17px;
    color: var(--ys-paper);
    border-left: 3px solid transparent;
  }

  .ys-nav__link::after { display: none; }

  .ys-nav__link:hover {
    border-left-color: var(--ys-gold);
    background: rgba(224, 169, 59, 0.08);
  }

  .ys-nav__link:focus-visible { box-shadow: inset 0 0 0 2px var(--ys-cyan); }

  .ys-nav__link[aria-current="page"] {
    border-left-color: var(--ys-cyan);
    background: rgba(55, 214, 201, 0.1);
  }

  .ys-nav__link[aria-current="page"]::after { display: none; }

  .ys-header__utility {
    margin-left: 0;
    padding: 16px var(--ys-gutter) 22px;
    flex-wrap: wrap;
    justify-content: flex-start;
    gap: 12px;
    border-top: 1px solid var(--ys-line-soft);
  }

  .ys-header__badge { display: inline-flex; }
}

@media (max-width: 1000px) {
  .ys-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ys-footer__col--brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .ys-grid--2,
  .ys-grid--3,
  .ys-grid--4,
  .ys-grid--asym { grid-template-columns: minmax(0, 1fr); }

  .ys-card--wide { grid-column: auto; }
  .ys-card--tall { grid-row: auto; }
}

@media (max-width: 640px) {
  .ys-footer__grid { grid-template-columns: minmax(0, 1fr); }
  .ys-footer__col--brand { grid-column: auto; }
  .ys-footer__bottom { justify-content: flex-start; }
  .ys-brand__suffix { display: none; }
  .ys-header__utility { flex-direction: column; align-items: stretch; }
  .ys-header__utility .ys-btn { width: 100%; }
}

/* ---------- 8. 无障碍与动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .ys-js .ys-reveal { opacity: 1 !important; transform: none !important; }

  .ys-card:hover,
  .ys-btn:hover,
  .ys-timeline__link:hover,
  .ys-footer__link:hover { transform: none; }
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}