/* ============================================================
   欧云娱乐会馆 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   ============================================================ */

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

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

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

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

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

img { height: auto; }

button, input, select, textarea { font: inherit; color: inherit; }

a { color: var(--oy-neon); }

:focus-visible {
  outline: 2px solid var(--oy-neon);
  outline-offset: 2px;
  border-radius: 1px;
}

:focus:not(:focus-visible) { outline: none; }

::selection {
  background: rgba(23, 224, 176, 0.28);
  color: #ffffff;
}

/* ---------- 2. 设计变量 ---------- */
:root {
  --oy-deep: #061623;
  --oy-layer: #0B2334;
  --oy-raise: #0F3247;
  --oy-neon: #17E0B0;
  --oy-neon-soft: #6FF3D6;
  --oy-gold: #F2B457;
  --oy-gold-soft: #F3D9A4;
  --oy-signal: #FF4D8D;
  --oy-ink: #EDF3F8;
  --oy-muted: #8FA8BC;
  --oy-line: rgba(201, 216, 228, 0.24);
  --oy-line-soft: rgba(201, 216, 228, 0.11);
  --oy-shadow: 0 18px 42px rgba(0, 0, 0, 0.42);

  --oy-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --oy-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --oy-max: 1280px;
  --oy-max-narrow: 860px;
  --oy-radius: 2px;
}

/* ---------- 3. 主排版 ---------- */
body {
  font-family: var(--oy-sans);
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--oy-ink);
  background-color: var(--oy-deep);
  background-image:
    radial-gradient(1100px 620px at 88% -8%, rgba(23, 224, 176, 0.11), transparent 62%),
    radial-gradient(860px 520px at 2% 4%, rgba(242, 180, 87, 0.08), transparent 60%),
    radial-gradient(700px 700px at 50% 120%, rgba(255, 77, 141, 0.06), transparent 65%),
    linear-gradient(180deg, #061623 0%, #04101A 100%);
  background-repeat: no-repeat;
  min-height: 100vh;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.18;
}

h1 { font-size: clamp(34px, 5.6vw, 56px); }
h2 { font-size: clamp(26px, 3.6vw, 40px); }
h3 { font-size: clamp(21px, 2.2vw, 28px); }
h4 { font-size: 22px; }

p { line-height: 1.75; }

strong, b { font-weight: 800; }

/* 工具类 */
.oy-mono {
  font-family: var(--oy-mono);
  font-weight: 600;
  letter-spacing: 0.02em;
  font-variant-numeric: tabular-nums;
}

.oy-muted { color: var(--oy-muted); font-size: 15px; line-height: 1.7; }

.oy-hl {
  color: var(--oy-neon-soft);
  font-weight: 700;
}

.oy-label {
  display: inline-block;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--oy-muted);
  text-transform: uppercase;
}

.oy-divider {
  height: 1px;
  background: var(--oy-line-soft);
  margin: 32px 0;
  border: 0;
}

/* ---------- 4. 布局容器与网格 ---------- */
.oy-container {
  width: 100%;
  max-width: var(--oy-max);
  margin: 0 auto;
  padding: 0 24px;
}

.oy-container--narrow { max-width: var(--oy-max-narrow); }

.oy-main { display: block; padding-bottom: 72px; }

#main-content { display: block; outline: none; }

.oy-section { padding: 64px 0; }
.oy-section--wide { padding: 96px 0; }
.oy-section--narrow { padding: 40px 0; }

.oy-section__head { max-width: 72ch; margin-bottom: 28px; }

.oy-section__index {
  display: block;
  font-family: var(--oy-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.22em;
  color: var(--oy-gold);
  margin-bottom: 10px;
}

.oy-section__title { margin: 0; }

.oy-section__lead {
  margin-top: 14px;
  color: var(--oy-muted);
  max-width: 68ch;
  font-size: 16px;
}

.oy-stripe {
  height: 6px;
  background: linear-gradient(90deg,
    var(--oy-neon) 0 32%,
    var(--oy-gold) 32% 66%,
    var(--oy-signal) 66% 100%);
}

.oy-stripe--thin { height: 2px; opacity: 0.9; }

.oy-grid { display: grid; gap: 20px; }
.oy-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.oy-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.oy-grid--sidebar { grid-template-columns: minmax(0, 2fr) minmax(0, 1fr); }

/* ---------- 5. 头部 ---------- */
.oy-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(6, 22, 35, 0.94);
  border-bottom: 1px solid var(--oy-line-soft);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.oy-header__inner {
  width: 100%;
  max-width: var(--oy-max);
  margin: 0 auto;
  padding: 0 24px;
}

.oy-header__top {
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 66px;
  padding: 12px 0 8px;
}

.oy-brand {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  flex: 0 0 auto;
  text-decoration: none;
  border-left: 3px solid var(--oy-neon);
  padding-left: 12px;
}

.oy-brand__name {
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--oy-ink);
  transition: color 0.18s ease;
}

.oy-brand:hover .oy-brand__name { color: var(--oy-neon); }

.oy-brand__tag {
  font-family: var(--oy-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--oy-gold);
}

.oy-nav { margin-left: auto; }

.oy-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.oy-nav__item { display: block; }

.oy-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 10px 12px;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--oy-ink);
  text-decoration: none;
  border-radius: var(--oy-radius);
  transition: color 0.18s ease, background-color 0.18s ease;
}

.oy-nav__link::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  background: var(--oy-neon);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.24s ease;
}

.oy-nav__link:hover,
.oy-nav__link:focus-visible {
  color: var(--oy-neon-soft);
  background: rgba(23, 224, 176, 0.07);
}

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

.oy-nav__num {
  font-family: var(--oy-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--oy-gold);
}

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

.oy-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.oy-header__cta { letter-spacing: 0.14em; }

/* 汉堡按钮 */
.oy-nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 40px;
  padding: 0;
  background: rgba(15, 50, 71, 0.75);
  border: 1px solid var(--oy-line);
  border-radius: var(--oy-radius);
  cursor: pointer;
  transition: border-color 0.18s ease, background-color 0.18s ease;
}

.oy-nav-toggle:hover { border-color: rgba(23, 224, 176, 0.6); }

.oy-nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--oy-neon);
  transition: background-color 0.2s ease;
}

.oy-nav-toggle__bars::before,
.oy-nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--oy-neon);
  transition: transform 0.24s ease, top 0.24s ease;
}

.oy-nav-toggle__bars::before { top: -6px; }
.oy-nav-toggle__bars::after { top: 6px; }

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

/* 快速条 */
.oy-quickbar {
  border-top: 1px solid var(--oy-line-soft);
  padding: 8px 0 10px;
  background: linear-gradient(90deg, rgba(23, 224, 176, 0.05), rgba(242, 180, 87, 0.04) 60%, transparent);
}

.oy-quickbar__list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 30px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.oy-quickbar__item { white-space: nowrap; }

.oy-quickbar__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 2px 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--oy-muted);
  text-decoration: none;
  border-bottom: 1px dashed transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.oy-quickbar__link:hover,
.oy-quickbar__link:focus-visible {
  color: var(--oy-gold-soft);
  border-bottom-color: var(--oy-gold);
}

.oy-quickbar__key {
  font-family: var(--oy-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--oy-gold);
}

/* 滚动进度读数 */
.oy-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(201, 216, 228, 0.08);
  overflow: hidden;
}

.oy-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--oy-neon), var(--oy-gold) 62%, var(--oy-signal));
  transition: width 0.1s linear;
}

/* 跳转链接 */
.oy-skip {
  position: absolute;
  left: 16px;
  top: -72px;
  z-index: 90;
  padding: 10px 16px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.1em;
  color: #04211A;
  background: var(--oy-neon);
  border-radius: var(--oy-radius);
  text-decoration: none;
  transition: top 0.2s ease;
}

.oy-skip:focus { top: 10px; }

/* ---------- 6. 页脚 ---------- */
.oy-footer {
  margin-top: 88px;
  background: linear-gradient(180deg, #0B2334 0%, #061623 100%);
  border-top: 1px solid var(--oy-line);
  color: var(--oy-muted);
}

.oy-footer__inner { padding-top: 44px; padding-bottom: 30px; }

.oy-footer__brandrow {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 22px;
  padding-bottom: 24px;
}

.oy-footer__brand {
  font-size: 24px;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--oy-ink);
  text-decoration: none;
  transition: color 0.18s ease;
}

.oy-footer__brand:hover { color: var(--oy-neon); }

.oy-footer__slogan {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--oy-muted);
}

.oy-footer__icp {
  margin-left: auto;
  font-family: var(--oy-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--oy-gold);
}

.oy-footer__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 34px;
  padding: 32px 0;
  border-top: 1px solid var(--oy-line-soft);
  border-bottom: 1px solid var(--oy-line-soft);
}

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

.oy-footer__title {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--oy-gold);
  margin-bottom: 16px;
}

.oy-footer__list {
  display: flex;
  flex-direction: column;
  gap: 11px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.oy-footer__link {
  display: inline-block;
  font-size: 15px;
  color: var(--oy-ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.oy-footer__link:hover,
.oy-footer__link:focus-visible {
  color: var(--oy-neon);
  border-bottom-color: rgba(23, 224, 176, 0.55);
}

.oy-footer__contact {
  font-size: 15px;
  line-height: 1.9;
  color: var(--oy-muted);
  word-break: break-word;
}

.oy-footer__contact .oy-mono { color: var(--oy-ink); }

.oy-footer__legalrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 30px;
  padding-top: 24px;
}

.oy-footer__note {
  flex: 1 1 340px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--oy-muted);
}

.oy-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
}

.oy-footer__copy {
  font-family: var(--oy-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--oy-muted);
}

.oy-footer__year { color: var(--oy-gold); }

/* ---------- 7. 按钮 ---------- */
.oy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--oy-radius);
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease,
              border-color 0.18s ease, box-shadow 0.24s ease, transform 0.18s ease;
}

.oy-btn--primary {
  background: var(--oy-neon);
  color: #04211A;
  border-color: var(--oy-neon);
}

.oy-btn--primary:hover,
.oy-btn--primary:focus-visible {
  background: var(--oy-neon-soft);
  box-shadow: 0 0 0 1px rgba(23, 224, 176, 0.5), 0 0 26px rgba(23, 224, 176, 0.32);
}

.oy-btn--ghost {
  background: rgba(15, 50, 71, 0.7);
  color: var(--oy-ink);
  border-color: var(--oy-line);
}

.oy-btn--ghost:hover,
.oy-btn--ghost:focus-visible {
  color: var(--oy-neon);
  border-color: rgba(23, 224, 176, 0.6);
}

.oy-btn--signal {
  background: rgba(255, 77, 141, 0.14);
  color: var(--oy-signal);
  border-color: rgba(255, 77, 141, 0.5);
}

.oy-btn--signal:hover,
.oy-btn--signal:focus-visible {
  background: rgba(255, 77, 141, 0.24);
}

/* ---------- 8. 面包屑 ---------- */
.oy-crumbs { padding-top: 20px; }

.oy-crumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--oy-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.oy-crumbs__item { display: inline-flex; align-items: center; gap: 9px; }

.oy-crumbs__link {
  color: var(--oy-muted);
  text-decoration: none;
  transition: color 0.18s ease;
}

.oy-crumbs__link:hover { color: var(--oy-neon); }

.oy-crumbs__sep { color: rgba(201, 216, 228, 0.34); }

.oy-crumbs__item[aria-current="page"] { color: var(--oy-gold); }

/* ---------- 9. 卡片与读数 ---------- */
.oy-card {
  position: relative;
  display: block;
  padding: 22px;
  background: var(--oy-layer);
  border: 1px solid var(--oy-line);
  border-radius: var(--oy-radius);
  transition: border-color 0.2s ease, transform 0.24s ease, box-shadow 0.24s ease;
}

.oy-card:hover {
  border-color: rgba(23, 224, 176, 0.55);
  transform: translateY(-2px);
  box-shadow: var(--oy-shadow);
}

.oy-card__body { position: relative; }

.oy-card__title {
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.35;
  margin-bottom: 8px;
  color: var(--oy-ink);
}

.oy-card__meta {
  font-family: var(--oy-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--oy-muted);
}

.oy-readout {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  background: var(--oy-raise);
  border-left: 3px solid var(--oy-gold);
  border-radius: var(--oy-radius);
}

.oy-readout__num {
  font-family: var(--oy-mono);
  font-size: clamp(26px, 3vw, 34px);
  font-weight: 600;
  line-height: 1;
  color: var(--oy-gold);
  font-variant-numeric: tabular-nums;
}

.oy-readout__label {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--oy-muted);
}

/* ---------- 10. 徽章与标签 ---------- */
.oy-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  font-family: var(--oy-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--oy-muted);
  background: rgba(15, 50, 71, 0.75);
  border: 1px solid var(--oy-line);
  border-radius: var(--oy-radius);
  white-space: nowrap;
}

.oy-badge--teal {
  color: var(--oy-neon);
  border-color: rgba(23, 224, 176, 0.45);
  background: rgba(23, 224, 176, 0.09);
}

.oy-badge--gold {
  color: var(--oy-gold);
  border-color: rgba(242, 180, 87, 0.45);
  background: rgba(242, 180, 87, 0.09);
}

.oy-badge--signal {
  color: var(--oy-signal);
  border-color: rgba(255, 77, 141, 0.5);
  background: rgba(255, 77, 141, 0.1);
}

.oy-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.oy-tag {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--oy-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--oy-neon-soft);
  border: 1px dashed rgba(111, 243, 214, 0.42);
  border-radius: var(--oy-radius);
}

/* ---------- 11. 表格 ---------- */
.oy-table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  background: var(--oy-layer);
  border: 1px solid var(--oy-line);
  border-radius: var(--oy-radius);
}

.oy-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 15px;
}

.oy-table caption {
  padding: 14px 16px;
  text-align: left;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--oy-gold);
  border-bottom: 1px solid var(--oy-line-soft);
}

.oy-table th {
  padding: 12px 16px;
  text-align: left;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--oy-muted);
  background: var(--oy-raise);
  white-space: nowrap;
}

.oy-table td {
  padding: 13px 16px;
  vertical-align: top;
  border-top: 1px solid var(--oy-line-soft);
  color: var(--oy-ink);
}

.oy-table tbody tr:hover { background: rgba(23, 224, 176, 0.055); }

.oy-table td .oy-mono { color: var(--oy-gold); }

/* ---------- 12. 分段切换 ---------- */
.oy-tabs { margin: 0; }

.oy-tabs__list {
  display: flex;
  flex-wrap: nowrap;
  gap: 0;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-bottom: 1px solid var(--oy-line);
}

.oy-tabs__tab {
  flex: 0 0 auto;
  padding: 12px 18px;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--oy-muted);
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color 0.18s ease, background-color 0.18s ease, border-color 0.18s ease;
}

.oy-tabs__tab:hover {
  color: var(--oy-ink);
  background: rgba(23, 224, 176, 0.055);
}

.oy-tabs__tab[aria-selected="true"] {
  color: var(--oy-neon);
  border-bottom-color: var(--oy-neon);
  background: rgba(23, 224, 176, 0.08);
}

.oy-tabs__panel { padding: 0; }
.oy-tabs__panel[hidden] { display: none; }

/* ---------- 13. 时间轴 ---------- */
.oy-timeline {
  margin: 0;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 1px solid var(--oy-line);
}

.oy-timeline__item {
  position: relative;
  padding: 0 0 30px 6px;
}

.oy-timeline__dot {
  position: absolute;
  left: -28px;
  top: 7px;
  width: 10px;
  height: 10px;
  background: var(--oy-deep);
  border: 1px solid var(--oy-gold);
  transform: rotate(45deg);
  transition: background-color 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.oy-timeline__item.is-lit .oy-timeline__dot {
  background: var(--oy-gold);
  border-color: var(--oy-gold);
  box-shadow: 0 0 0 4px rgba(242, 180, 87, 0.16), 0 0 16px rgba(242, 180, 87, 0.4);
}

.oy-timeline__time {
  display: block;
  font-family: var(--oy-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--oy-gold);
  margin-bottom: 6px;
}

/* ---------- 14. 图片容器（页面阶段放图） ---------- */
.oy-media {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: linear-gradient(160deg, #0B2334 0%, #0F3247 100%);
  border: 1px solid var(--oy-line);
  border-radius: var(--oy-radius);
}

.oy-media::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(23, 224, 176, 0.09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 224, 176, 0.09) 1px, transparent 1px);
  background-size: 34px 34px;
  opacity: 0.7;
  pointer-events: none;
}

.oy-media img {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.06) contrast(1.04);
}

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

.oy-media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  font-family: var(--oy-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--oy-gold-soft);
  background: linear-gradient(180deg, rgba(6, 22, 35, 0), rgba(6, 22, 35, 0.92));
}

/* ---------- 15. 说明块 ---------- */
.oy-note {
  padding: 16px 20px;
  font-size: 15px;
  color: var(--oy-ink);
  background: rgba(243, 217, 164, 0.09);
  border-left: 3px solid var(--oy-gold-soft);
  border-radius: var(--oy-radius);
}

.oy-note .oy-mono { color: var(--oy-gold); }

/* ---------- 16. 显现动效 ---------- */
[data-reveal],
.oy-timeline__item {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.24s ease-out, transform 0.24s ease-out;
}

[data-reveal].is-visible,
.oy-timeline__item.is-lit {
  opacity: 1;
  transform: none;
}

html:not(.oy-js) [data-reveal],
html:not(.oy-js) .oy-timeline__item {
  opacity: 1;
  transform: none;
}

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1180px) {
  .oy-header__top { gap: 12px; }
  .oy-nav__link { padding: 10px 9px; font-size: 13.5px; }
}

@media (max-width: 1020px) {
  .oy-grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .oy-grid--sidebar { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 900px) {
  .oy-nav-toggle { display: inline-flex; }

  .oy-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    margin-left: 0;
    max-height: calc(100vh - 140px);
    overflow-y: auto;
    background: linear-gradient(180deg, #0B2334 0%, #081D2C 100%);
    border-top: 1px solid var(--oy-line-soft);
    border-bottom: 1px solid var(--oy-line);
    box-shadow: 0 26px 50px rgba(0, 0, 0, 0.52);
  }

  .oy-nav[data-open] { display: block; }

  .oy-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 24px 16px;
  }

  .oy-nav__item { border-bottom: 1px solid var(--oy-line-soft); }
  .oy-nav__item:last-child { border-bottom: 0; }

  .oy-nav__link {
    display: flex;
    width: 100%;
    padding: 15px 4px;
    font-size: 16px;
  }

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

  .oy-nav__link[aria-current="page"] {
    color: var(--oy-neon);
    background: rgba(23, 224, 176, 0.08);
    padding-left: 10px;
  }

  .oy-quickbar__list {
    flex-wrap: nowrap;
    gap: 6px 22px;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .oy-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .oy-container { padding: 0 18px; }
  .oy-header__inner { padding: 0 18px; }
  .oy-section { padding: 48px 0; }
  .oy-section--wide { padding: 64px 0; }

  .oy-grid--2,
  .oy-grid--3 { grid-template-columns: minmax(0, 1fr); }

  .oy-crumbs__list { font-size: 11px; }
}

@media (max-width: 560px) {
  .oy-brand__name { font-size: 17px; }
  .oy-brand__tag { font-size: 10px; letter-spacing: 0.04em; }
  .oy-header__cta { padding: 10px 14px; font-size: 12px; letter-spacing: 0.1em; }
  .oy-header__actions { gap: 8px; }

  .oy-footer__grid { grid-template-columns: minmax(0, 1fr); }
  .oy-footer__icp { margin-left: 0; }
  .oy-footer__brand { font-size: 21px; }
  .oy-footer__legalrow { gap: 12px; }
  .oy-media { aspect-ratio: 4 / 3; }
}

/* ---------- 18. 无障碍与动效偏好 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  [data-reveal],
  .oy-timeline__item {
    opacity: 1 !important;
    transform: none !important;
  }

  .oy-card:hover { transform: none; }
}