/* ==========================================================================
   凤凰体育赛场 · 共享样式 /assets/site.css
   展览画册式布局 · 赛场夜灯配色 · 纸张叠层材质
   ========================================================================== */

:root {
  --flame: #F4552B;
  --flame-deep: #B21F0C;
  --ember: #FF9A5C;
  --void: #0B0E14;
  --steel: #1B2230;
  --lamp: #F7F5F2;
  --paper: #EDE6DC;
  --data-blue: #2E7BE0;
  --mist: #A9C9F2;
  --mint: #17C3A8;

  --ink: #F7F5F2;
  --ink-dim: rgba(247, 245, 242, .64);
  --ink-faint: rgba(247, 245, 242, .40);
  --line: rgba(247, 245, 242, .14);
  --line-strong: rgba(247, 245, 242, .30);

  --shell: 1240px;
  --gutter: clamp(18px, 4vw, 56px);

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

  --ease: cubic-bezier(.22, .85, .24, 1);
}

/* ---------- reset ---------- */

*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  background: var(--void);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

/* ---------- 跳转链接 ---------- */

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 11px 20px;
  background: var(--flame);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  transform: translateY(-240%);
  transition: transform .22s var(--ease);
}

.skip-link:focus { transform: translateY(0); }

/* ---------- 容器与分区 ---------- */

.shell {
  width: min(var(--shell), calc(100% - var(--gutter) * 2));
  margin-inline: auto;
}

.section { padding-block: clamp(56px, 8vw, 120px); }
.section--tight { padding-block: clamp(34px, 5vw, 64px); }

.section--light {
  background: var(--paper);
  color: var(--void);
  --ink: #0B0E14;
  --ink-dim: rgba(11, 14, 20, .68);
  --ink-faint: rgba(11, 14, 20, .46);
  --line: rgba(11, 14, 20, .14);
  --line-strong: rgba(11, 14, 20, .32);
}

.hot-line,
.flame-rule {
  height: 2px;
  border: 0;
  background: linear-gradient(90deg, var(--flame), var(--ember) 38%, var(--data-blue) 74%, transparent);
}

.prose { max-width: 40em; }
.prose p + p { margin-top: 1.1em; }

/* ---------- 字号与索引 ---------- */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .20em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  flex: 0 0 auto;
  background: var(--flame);
}

.display-title {
  font-size: clamp(40px, 7vw, 88px);
  font-weight: 200;
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--ink);
}

.section-title {
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 500;
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--ink);
}

.lede {
  max-width: 44ch;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.75;
  color: var(--ink-dim);
}

.data-num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1.6em;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--ember);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--ink-dim);
  white-space: nowrap;
}

.badge--flame {
  background: var(--ember);
  border-color: var(--ember);
  color: #2B0A02;
  font-weight: 600;
}

.badge--mint {
  border-color: rgba(23, 195, 168, .55);
  color: var(--mint);
}

/* ---------- 面包屑 ---------- */

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .10em;
  color: var(--ink-faint);
}

.breadcrumb a { transition: color .2s var(--ease); }
.breadcrumb a:hover { color: var(--ember); }
.breadcrumb-sep { opacity: .55; }

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 24px;
  border: 1px solid transparent;
  font-size: 15px;
  letter-spacing: .06em;
  line-height: 1.2;
  white-space: nowrap;
  transition: background .24s var(--ease), color .24s var(--ease),
              border-color .24s var(--ease), transform .24s var(--ease);
}

.btn--sm { padding: 10px 16px; font-size: 13.5px; letter-spacing: .05em; }

.btn--flame {
  background: var(--flame);
  color: #fff;
}

.btn--flame:hover {
  background: var(--ember);
  color: #2B0A02;
  transform: translateY(-2px);
}

.btn--ghost {
  border-color: var(--line-strong);
  color: var(--ink);
}

.btn--ghost:hover {
  border-color: var(--flame);
  color: var(--flame);
  transform: translateY(-2px);
}

/* ---------- 筛选组件 ---------- */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.filter-btn {
  padding: 9px 16px;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .12em;
  color: var(--ink-dim);
  transition: background .22s var(--ease), color .22s var(--ease),
              border-color .22s var(--ease), transform .22s var(--ease);
}

.filter-btn:hover {
  border-color: var(--ember);
  color: var(--ink);
  transform: translateY(-1px);
}

.filter-btn[aria-pressed="true"] {
  background: var(--ember);
  border-color: var(--ember);
  color: #2B0A02;
}

.filter-status {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--ink-faint);
}

/* ---------- 卡片与图片容器 ---------- */

.paper-card {
  position: relative;
  padding: clamp(20px, 3vw, 32px);
  background: var(--paper);
  color: #0B0E14;
  box-shadow: 8px 8px 0 rgba(237, 230, 220, .16), 0 20px 46px rgba(0, 0, 0, .40);
  transition: transform .28s var(--ease), box-shadow .28s var(--ease);
}

.paper-card::after {
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px solid rgba(11, 14, 20, .12);
  pointer-events: none;
}

.paper-card:hover {
  transform: translateY(-4px);
  box-shadow: 8px 8px 0 rgba(237, 230, 220, .24), 0 28px 58px rgba(0, 0, 0, .50);
}

.paper-card--dark {
  background: var(--steel);
  color: var(--lamp);
  box-shadow: 8px 8px 0 rgba(46, 123, 224, .16), 0 20px 46px rgba(0, 0, 0, .44);
}

.paper-card--dark::after { border-color: rgba(247, 245, 242, .12); }

.media-frame {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 12% 8%, rgba(244, 85, 43, .50), transparent 62%),
    radial-gradient(130% 100% at 88% 92%, rgba(46, 123, 224, .42), transparent 64%),
    var(--steel);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame--cut {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 56px), calc(100% - 56px) 100%, 0 100%);
}

.media-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 2;
  padding: 5px 10px;
  background: rgba(11, 14, 20, .78);
  color: var(--lamp);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
}

/* ---------- 网格 ---------- */

.grid {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

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

/* ---------- 滚动显现 ---------- */

.js-motion .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .42s var(--ease), transform .42s var(--ease);
}

.js-motion .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ==========================================================================
   头部
   ========================================================================== */

.site-header {
  --header-h: 78px;
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(11, 14, 20, .90);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  transition: background .3s var(--ease);
}

.site-header.is-condensed { --header-h: 60px; }

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  height: 1px;
  width: 0;
  background: linear-gradient(90deg, var(--flame), var(--data-blue));
  transition: width .5s var(--ease);
}

.site-header.is-condensed::after { width: 100%; }

.header-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(14px, 3vw, 40px);
  height: var(--header-h);
  transition: height .3s var(--ease);
}

/* 品牌标记 */

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.brand-spine {
  display: inline-flex;
  align-items: center;
  height: 34px;
  padding-left: 7px;
  border-left: 1px solid var(--line-strong);
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .32em;
  line-height: 1;
  color: var(--ink-faint);
}

.brand-flare {
  width: 13px;
  height: 30px;
  flex: 0 0 auto;
  background: linear-gradient(180deg, var(--flame), var(--ember) 46%, var(--data-blue));
  clip-path: polygon(62% 0, 100% 0, 38% 100%, 0 100%);
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 3px;
  line-height: 1.1;
}

.brand-name {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--lamp);
  transition: font-size .28s var(--ease);
}

.brand-sub {
  max-height: 14px;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .22em;
  color: var(--ink-faint);
  transition: max-height .28s var(--ease), opacity .28s var(--ease);
}

.site-header.is-condensed .brand-name { font-size: 15.5px; }

.site-header.is-condensed .brand-sub {
  max-height: 0;
  opacity: 0;
}

/* 导航 */

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.2vw, 32px);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(14px, 1.9vw, 28px);
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 6px 2px;
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--ink-dim);
  white-space: nowrap;
  transition: color .22s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--flame);
  transition: right .28s var(--ease);
}

.nav-link:hover { color: var(--lamp); }
.nav-link:hover::after { right: 0; }

.nav-link[aria-current="page"] {
  color: var(--ember);
  font-weight: 600;
}

.nav-link[aria-current="page"]::after {
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--flame), var(--data-blue));
}

.nav-utility {
  padding: 9px 15px;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--ink);
  white-space: nowrap;
  transition: background .24s var(--ease), border-color .24s var(--ease), color .24s var(--ease);
}

.nav-utility:hover {
  background: var(--flame);
  border-color: var(--flame);
  color: #fff;
}

/* 汉堡按钮 */

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--ink);
}

.nav-toggle-bar {
  position: relative;
  display: block;
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: background .2s var(--ease);
}

.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 1px;
  background: currentColor;
  transition: transform .26s var(--ease);
}

.nav-toggle-bar::before { top: -5px; }
.nav-toggle-bar::after { top: 5px; }

.site-header[data-open] .nav-toggle-bar { background: transparent; }
.site-header[data-open] .nav-toggle-bar::before { transform: translateY(5px) rotate(45deg); }
.site-header[data-open] .nav-toggle-bar::after { transform: translateY(-5px) rotate(-45deg); }

/* ==========================================================================
   页脚
   ========================================================================== */

.site-footer {
  position: relative;
  padding-block: clamp(48px, 7vw, 88px) 34px;
  background: var(--void);
  border-top: 1px solid var(--line);
  color: var(--lamp);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--flame), var(--ember) 34%, var(--data-blue) 72%, transparent);
  opacity: .9;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) 2.4fr;
  gap: clamp(32px, 5vw, 76px);
}

.footer-mark {
  display: block;
  width: 42px;
  height: 2px;
  margin-bottom: 20px;
  background: linear-gradient(90deg, var(--flame), var(--data-blue));
}

.footer-brand-name {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: .08em;
}

.footer-brand-note {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--ink-faint);
}

.footer-brand .btn { margin-top: 22px; }

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 44px);
}

.footer-col-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .20em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.footer-link {
  display: block;
  padding: 6px 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink-dim);
  transition: color .2s var(--ease), transform .2s var(--ease);
}

.footer-link:hover {
  color: var(--ember);
  transform: translateX(3px);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px 30px;
  margin-top: clamp(36px, 5vw, 66px);
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--ink-faint);
}

.footer-legal {
  flex: 1 1 100%;
  max-width: 62ch;
  line-height: 1.7;
}

/* ==========================================================================
   响应式
   ========================================================================== */

@media (max-width: 1180px) {
  .nav-list { gap: 15px; }
  .nav-link { font-size: 14px; }
  .nav-utility { padding: 8px 11px; font-size: 10px; }
}

@media (max-width: 940px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    z-index: 95;
    width: min(84vw, 360px);
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 26px;
    padding: 40px clamp(22px, 7vw, 40px);
    background: var(--steel);
    border-left: 1px solid var(--line-strong);
    box-shadow: -30px 0 70px rgba(0, 0, 0, .55);
    overflow-y: auto;
    transform: translateX(101%);
    visibility: hidden;
    transition: transform .34s var(--ease), visibility .34s var(--ease);
  }

  .site-header[data-open] .site-nav {
    transform: none;
    visibility: visible;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
  }

  .nav-link {
    display: block;
    width: 100%;
    padding: 14px 0;
    font-size: 19px;
    border-bottom: 1px solid var(--line);
  }

  .nav-link::after { display: none; }

  .nav-link[aria-current="page"] { padding-left: 12px; }

  .nav-utility {
    width: 100%;
    padding: 14px;
    text-align: center;
  }

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

  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  body { font-size: 16px; }
  .brand-spine { display: none; }
  .brand-name { font-size: 16px; }
  .brand-flare { height: 26px; }
  .paper-card { box-shadow: 6px 6px 0 rgba(237, 230, 220, .16), 0 16px 34px rgba(0, 0, 0, .40); }
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 420px) {
  .nav-toggle-label { display: none; }
  .btn { width: 100%; }
  .filter-btn { padding: 8px 12px; }
}

/* ==========================================================================
   动效降级
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .js-motion .reveal {
    opacity: 1;
    transform: none;
  }

  .site-header::after { width: 100%; }
}