/* =========================================================
   星空体育CN · 共享样式表 /assets/site.css
   深空墨蓝底 + 电光青索引 + 暖金权益标签
   ========================================================= */

/* ---------- 01. 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 { margin: 0; }

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

button { font: inherit; color: inherit; }

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

a { color: var(--cyan); text-underline-offset: 3px; }

/* ---------- 02. 变量 ---------- */
:root {
  --ink: #070B1C;
  --ink-2: #0E1738;
  --ink-3: #16224d;
  --cyan: #35E7E0;
  --cyan-soft: #7FF3EC;
  --gold: #F6B33C;
  --gold-deep: #C77A1E;
  --paper: #F4EFE4;
  --ink-text: #12100E;
  --mist: #9AA6C2;
  --magenta: #FF4D8D;

  --r-s: 12px;
  --r-l: 16px;
  --r-pill: 999px;
  --bevel: 14px;

  --dur-1: 160ms;
  --dur-2: 240ms;
  --dur-3: 360ms;
  --ease: cubic-bezier(.22, .61, .36, 1);

  --shell: 1440px;
  --gutter: clamp(16px, 4vw, 40px);

  --line: rgba(154, 166, 194, .18);
  --line-cyan: rgba(53, 231, 224, .24);

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

/* ---------- 03. 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(900px 520px at 10% -8%, rgba(53, 231, 224, .14), transparent 60%),
    radial-gradient(760px 500px at 96% 2%, rgba(246, 179, 60, .10), transparent 58%),
    radial-gradient(820px 620px at 50% 112%, rgba(53, 231, 224, .08), transparent 64%);
  background-attachment: fixed;
  background-repeat: no-repeat;
  color: var(--mist);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 04. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  left: 50%;
  top: 0;
  transform: translate(-50%, -140%);
  z-index: 200;
  padding: 12px 22px;
  border-radius: 0 0 var(--r-l) var(--r-l);
  background: var(--cyan);
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .08em;
  text-decoration: none;
  transition: transform var(--dur-2) var(--ease);
}
.skip-link:focus {
  transform: translate(-50%, 0);
  outline: none;
}

/* ---------- 05. 粘性浮岛头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  padding: clamp(10px, 1.6vw, 18px) var(--gutter);
  transition: padding var(--dur-3) var(--ease);
}
.site-header.is-stuck {
  padding-top: 6px;
  padding-bottom: 6px;
}

.header-shell {
  position: relative;
  max-width: var(--shell);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 26px);
  padding: 10px clamp(10px, 1.6vw, 20px);
  border-radius: var(--r-pill);
  background: linear-gradient(120deg, rgba(14, 23, 56, .92), rgba(7, 11, 28, .84));
  border: 1px solid rgba(53, 231, 224, .16);
  box-shadow: 0 20px 60px -34px rgba(0, 0, 0, .95),
              inset 0 1px 0 rgba(127, 243, 236, .08);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  transition: padding var(--dur-3) var(--ease),
              background var(--dur-3) var(--ease),
              border-color var(--dur-3) var(--ease);
}
.site-header.is-stuck .header-shell {
  padding-top: 6px;
  padding-bottom: 6px;
  background: linear-gradient(120deg, rgba(14, 23, 56, .98), rgba(6, 9, 22, .96));
  border-color: rgba(53, 231, 224, .26);
}

/* ---------- 06. 品牌 ---------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  text-decoration: none;
}
.brand-mark {
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  background:
    radial-gradient(circle at 32% 28%, var(--cyan-soft), transparent 54%),
    conic-gradient(from 210deg, var(--gold), var(--cyan) 46%, var(--ink-3) 72%, var(--gold-deep));
  clip-path: polygon(0 8px, 8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  box-shadow: 0 0 18px -4px rgba(53, 231, 224, .7);
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.12;
}
.brand-name {
  color: var(--paper);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .05em;
}
.brand-sub {
  color: var(--mist);
  font-size: 10px;
  letter-spacing: .16em;
}

/* ---------- 07. 移动导航按钮 ---------- */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: auto;
  padding: 9px 15px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(53, 231, 224, .3);
  background: rgba(53, 231, 224, .07);
  color: var(--cyan-soft);
  font-size: 12px;
  letter-spacing: .14em;
  cursor: pointer;
  transition: background var(--dur-1) var(--ease), color var(--dur-1) var(--ease);
}
.nav-toggle:hover { background: rgba(53, 231, 224, .16); }
.nav-toggle-bars {
  position: relative;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur-2) var(--ease);
}
.nav-toggle-bars::before { top: -5px; }
.nav-toggle-bars::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-5px) rotate(-45deg); }

/* ---------- 08. 主导航 ---------- */
.primary-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
  min-width: 0;
}
.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.nav-item { display: block; }
.nav-link {
  position: relative;
  display: block;
  padding: 9px 14px;
  border-radius: var(--r-pill);
  color: #cbd4ea;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .02em;
  white-space: nowrap;
  text-decoration: none;
  transition: color var(--dur-1) var(--ease), background var(--dur-1) var(--ease);
}
.nav-link:hover {
  color: var(--paper);
  background: rgba(53, 231, 224, .09);
}
.nav-link[aria-current="page"] {
  color: var(--cyan);
  background: rgba(53, 231, 224, .13);
  box-shadow: inset 0 0 0 1px rgba(53, 231, 224, .38);
}
.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--gold);
  transform: translateX(-50%);
}

/* ---------- 09. 头部工具区 ---------- */
.header-tools {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}
.index-trigger {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 17px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(246, 179, 60, .42);
  background: linear-gradient(120deg, rgba(246, 179, 60, .18), rgba(199, 122, 30, .08));
  color: var(--gold);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
  cursor: pointer;
  transition: color var(--dur-1) var(--ease),
              background var(--dur-1) var(--ease),
              border-color var(--dur-1) var(--ease);
}
.index-trigger:hover {
  color: #24160a;
  background: linear-gradient(120deg, var(--gold), var(--gold-deep));
  border-color: var(--gold);
}
.index-trigger-dot {
  width: 7px;
  height: 7px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--magenta);
  box-shadow: 0 0 10px 1px rgba(255, 77, 141, .9);
}

/* ---------- 10. 三级索引浮层 ---------- */
.index-panel {
  position: absolute;
  left: 0;
  right: 0;
  top: calc(100% + 12px);
  z-index: 95;
  padding: clamp(16px, 2.4vw, 26px);
  border-radius: var(--r-l);
  background: linear-gradient(150deg, rgba(14, 23, 56, .985), rgba(6, 9, 22, .985));
  border: 1px solid rgba(53, 231, 224, .22);
  box-shadow: 0 34px 90px -34px rgba(0, 0, 0, .95);
  clip-path: polygon(0 0, calc(100% - var(--bevel)) 0, 100% var(--bevel), 100% 100%,
                     var(--bevel) 100%, 0 calc(100% - var(--bevel)));
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}
.index-panel[hidden] { display: none; }

.index-panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.index-panel-title { color: var(--cyan); }
.index-path {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  color: rgba(154, 166, 194, .6);
}
.index-path-slot {
  padding: 3px 11px;
  border-radius: var(--r-pill);
  border: 1px dashed rgba(154, 166, 194, .32);
  transition: color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease),
              background var(--dur-1) var(--ease);
}
.index-path-slot.is-set {
  border-style: solid;
  border-color: var(--cyan);
  color: var(--cyan-soft);
  background: rgba(53, 231, 224, .12);
}
.index-path-sep { color: rgba(154, 166, 194, .4); }
.index-close {
  margin-left: auto;
  padding: 7px 15px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(154, 166, 194, .3);
  background: transparent;
  color: var(--mist);
  font-size: 12px;
  letter-spacing: .1em;
  cursor: pointer;
  transition: color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease);
}
.index-close:hover {
  color: var(--paper);
  border-color: var(--paper);
}

.index-search {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  padding: 14px 0;
}
.index-input {
  flex: 1 1 260px;
  min-width: 0;
  padding: 11px 18px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(53, 231, 224, .26);
  background: rgba(7, 11, 28, .88);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 14px;
  transition: border-color var(--dur-1) var(--ease), box-shadow var(--dur-1) var(--ease);
}
.index-input::placeholder { color: rgba(154, 166, 194, .65); }
.index-input:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(53, 231, 224, .18);
}
.index-search-hint {
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(154, 166, 194, .8);
}

.index-groups {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(12px, 2vw, 22px);
}
.index-group {
  padding: 14px 16px;
  border-radius: var(--r-s);
  background: rgba(22, 34, 77, .34);
  border: 1px solid var(--line);
}
.index-group[hidden] { display: none; }
.index-group-title {
  color: var(--cyan-soft);
  margin-bottom: 12px;
}
.index-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.index-item {
  padding: 7px 14px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(154, 166, 194, .24);
  background: rgba(7, 11, 28, .62);
  color: #cbd4ea;
  font-family: var(--font-sans);
  font-size: 13px;
  cursor: pointer;
  transition: color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease),
              background var(--dur-1) var(--ease), transform var(--dur-1) var(--ease);
}
.index-item[hidden] { display: none; }
.index-item:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  transform: translateY(-1px);
}
.index-item.is-selected {
  border-color: var(--cyan);
  background: rgba(53, 231, 224, .16);
  color: var(--cyan-soft);
  box-shadow: 0 0 18px -8px rgba(53, 231, 224, .95);
}
.index-empty {
  margin: 14px 0 0;
  font-size: 13px;
  color: var(--magenta);
}
.index-empty[hidden] { display: none; }

/* ---------- 11. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  background: linear-gradient(180deg, rgba(7, 11, 28, 0) 0%, #060917 12%, #04060f 100%);
  border-top: 1px solid rgba(53, 231, 224, .16);
  color: var(--mist);
}

.footer-ticker {
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background: rgba(14, 23, 56, .55);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 5%, #000 95%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 5%, #000 95%, transparent);
}
.ticker-track {
  display: flex;
  gap: 44px;
  width: max-content;
  padding: 11px 0;
  animation: ticker-scroll 42s linear infinite;
}
.ticker-item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  white-space: nowrap;
  color: rgba(154, 166, 194, .82);
}
.ticker-tag {
  padding: 2px 9px;
  border-radius: var(--r-pill);
  background: rgba(246, 179, 60, .14);
  border: 1px solid rgba(246, 179, 60, .3);
  color: var(--gold);
  font-family: var(--font-sans);
  font-size: 11px;
  letter-spacing: .12em;
}
@keyframes ticker-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

.footer-inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(36px, 5vw, 64px) var(--gutter) 26px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.45fr 1fr 1fr 1.35fr;
  gap: clamp(22px, 3vw, 48px);
}
.footer-brand .brand { margin-bottom: 6px; }
.footer-tagline {
  margin: 14px 0 20px;
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(154, 166, 194, .9);
}
.footer-cta { margin-top: 0; }

.footer-col-title {
  color: var(--cyan-soft);
  margin-bottom: 16px;
}
.footer-col--contact { min-width: 0; }

.footer-list {
  display: flex;
  flex-direction: column;
  gap: 11px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-list--inline {
  flex-direction: row;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 16px;
}
.footer-list--plain li {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(154, 166, 194, .86);
}
.footer-link {
  color: var(--mist);
  font-size: 14px;
  text-decoration: none;
  transition: color var(--dur-1) var(--ease);
}
.footer-link:hover { color: var(--cyan); }

.footer-index-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 0;
  border: 0;
  background: none;
  color: var(--mist);
  font-size: 14px;
  cursor: pointer;
  transition: color var(--dur-1) var(--ease);
}
.footer-index-btn::before {
  content: "›";
  color: var(--gold);
  transition: transform var(--dur-1) var(--ease);
}
.footer-index-btn:hover { color: var(--cyan); }
.footer-index-btn:hover::before { transform: translateX(3px); }

.footer-strong {
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .02em;
  word-break: break-all;
}
.footer-note {
  margin: 14px 0 0;
  max-width: 42ch;
  font-size: 12px;
  line-height: 1.75;
  color: rgba(154, 166, 194, .68);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: clamp(28px, 4vw, 46px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.footer-legal {
  margin: 0;
  font-size: 12px;
  letter-spacing: .05em;
  color: rgba(154, 166, 194, .74);
}
.footer-legal--icp { font-family: var(--font-mono); }

/* ---------- 12. 页面通用容器与面板 ---------- */
.container {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding-inline: var(--gutter);
}
.section {
  position: relative;
  padding-block: clamp(44px, 7vw, 92px);
}
.panel {
  position: relative;
  padding: clamp(20px, 3vw, 36px);
  border-radius: var(--r-l);
  background: linear-gradient(150deg, rgba(14, 23, 56, .88), rgba(7, 11, 28, .92));
  border: 1px solid rgba(53, 231, 224, .14);
  box-shadow: 0 26px 70px -42px rgba(0, 0, 0, .95);
}
.panel--paper {
  background: var(--paper);
  color: var(--ink-text);
  border-color: rgba(18, 16, 14, .14);
}
.panel--paper .label { color: rgba(18, 16, 14, .55); }
.panel--paper a { color: #0b6f6b; }
.panel--cut {
  clip-path: polygon(0 0, calc(100% - var(--bevel)) 0, 100% var(--bevel), 100% 100%,
                     var(--bevel) 100%, 0 calc(100% - var(--bevel)));
  border-radius: 0;
}

/* ---------- 13. 文字阶梯 ---------- */
.display-1,
.display-2,
.display-3 {
  font-family: var(--font-display);
  color: var(--paper);
  font-weight: 900;
  letter-spacing: .04em;
  line-height: 1.04;
  margin: 0;
}
.display-1 { font-size: clamp(40px, 8vw, 96px); }
.display-2 { font-size: clamp(32px, 5.2vw, 72px); }
.display-3 { font-size: clamp(26px, 3.4vw, 56px); }

.lede {
  max-width: 38ch;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.8;
  color: var(--mist);
}
.panel--paper .lede { color: rgba(18, 16, 14, .78); }

.label {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
}

/* ---------- 14. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: var(--r-pill);
  border: 1px solid transparent;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--dur-1) var(--ease), background var(--dur-1) var(--ease),
              color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease),
              filter var(--dur-1) var(--ease);
}
.btn:active { transform: translateY(1px); }
.btn--gold {
  background: linear-gradient(120deg, var(--gold), var(--gold-deep));
  color: #24160a;
  box-shadow: 0 16px 36px -20px rgba(246, 179, 60, .95);
}
.btn--gold:hover { filter: brightness(1.08); }
.btn--ghost {
  background: transparent;
  border-color: rgba(53, 231, 224, .42);
  color: var(--cyan);
}
.btn--ghost:hover {
  background: rgba(53, 231, 224, .12);
  color: var(--cyan-soft);
}
.btn--solid {
  background: var(--cyan);
  color: #04212a;
}
.btn--solid:hover { filter: brightness(1.06); }

/* ---------- 15. 面包屑 ---------- */
.breadcrumbs { padding-top: 22px; }
.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 12px;
  letter-spacing: .1em;
  color: rgba(154, 166, 194, .8);
}
.breadcrumb-list li {
  display: flex;
  align-items: center;
  gap: 10px;
}
.breadcrumb-list li + li::before {
  content: "/";
  color: rgba(53, 231, 224, .5);
}
.breadcrumb-link {
  color: var(--cyan);
  text-decoration: none;
}
.breadcrumb-link:hover { text-decoration: underline; }
.breadcrumb-list [aria-current="page"] { color: var(--paper); }

/* ---------- 16. 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(14px, 1.8vw, 24px);
}
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

/* ---------- 17. 图片占位容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--r-l);
  background:
    radial-gradient(120% 90% at 18% 0%, rgba(53, 231, 224, .22), transparent 58%),
    linear-gradient(135deg, rgba(22, 34, 77, .95), rgba(7, 11, 28, .98));
  border: 1px solid rgba(53, 231, 224, .16);
  clip-path: polygon(0 0, calc(100% - var(--bevel)) 0, 100% var(--bevel), 100% 100%,
                     var(--bevel) 100%, 0 calc(100% - var(--bevel)));
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(127, 243, 236, .07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(127, 243, 236, .07) 1px, transparent 1px);
  background-size: 48px 48px;
}
.media-frame img,
.media-frame picture,
.media-frame video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--21x9 { aspect-ratio: 21 / 9; }
.media-frame--4x5 { aspect-ratio: 4 / 5; }

/* ---------- 18. 滚动显现 ---------- */
.reveal {
  opacity: 1;
  transform: none;
}
.has-js .reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur-3) var(--ease), transform var(--dur-3) var(--ease);
}
.has-js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 19. 断点 ---------- */
@media (max-width: 1180px) {
  .nav-link { padding: 9px 11px; font-size: 13.5px; }
  .brand-sub { display: none; }
}

@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .brand { margin-right: auto; }
  .brand-sub { display: block; }
  .nav-toggle { display: inline-flex; }

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 10px);
    display: none;
    padding: 12px;
    border-radius: var(--r-l);
    background: linear-gradient(150deg, rgba(14, 23, 56, .99), rgba(6, 9, 22, .99));
    border: 1px solid rgba(53, 231, 224, .22);
    box-shadow: 0 32px 80px -36px rgba(0, 0, 0, .95);
  }
  .primary-nav[data-open] { display: block; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }
  .nav-link {
    padding: 13px 15px;
    border-radius: var(--r-s);
    font-size: 15px;
  }
  .nav-link[aria-current="page"]::after { display: none; }

  .index-trigger { padding: 9px 13px; font-size: 12px; }
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  .index-groups { grid-template-columns: 1fr; }
  .index-panel {
    max-height: min(74vh, 580px);
    overflow-y: auto;
  }
  .index-panel-head { gap: 10px; }
  .index-close { margin-left: 0; }
  .media-frame--21x9 { aspect-ratio: 16 / 9; }
  .grid--12 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .brand-name { font-size: 16px; }
  .nav-toggle-label { display: none; }
  .btn { padding: 12px 22px; }
}

/* ---------- 20. 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;
  }
  .ticker-track {
    animation: none;
    width: 100%;
    flex-wrap: wrap;
    gap: 14px 28px;
    padding: 12px var(--gutter);
  }
  .has-js .reveal {
    opacity: 1;
    transform: none;
  }
}