/* ============================================================
   冠竞赛场 /assets/site.css — 共享外壳与基础组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }

/* ---------- 2. 设计变量 ---------- */
:root {
  --arena: #06120F;
  --pitch: #0C211B;
  --board: #143128;
  --accent: #C8FF3D;
  --accent-ink: #06120F;
  --accent-text: #C8FF3D;
  --orange: #FF6A2B;
  --cyan: #4FD8C4;
  --ice: #F1F4F2;
  --fog: #9DB0A8;
  --line: #2A423A;
  --alert: #FF4D4D;

  --rail-w: 88px;
  --nav-w: 124px;
  --util-h: 44px;
  --top-bar-h: 66px;

  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: Inter, "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --rail-transition: 0.28s var(--ease);
}

html[data-scrolled="true"] { --rail-w: 56px; }

html[data-theme="light"] {
  --arena: #EDF2EE;
  --pitch: #E2EAE4;
  --board: #D3DED6;
  --ice: #06120F;
  --fog: #54655C;
  --line: #BECBC2;
  --accent-text: #3D6B08;
}

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: 0;
  background: var(--arena);
  color: var(--ice);
  padding-inline-start: var(--rail-w);
  padding-inline-end: var(--nav-w);
  padding-block-start: var(--util-h);
  transition: padding-inline-start var(--rail-transition), padding-inline-end var(--rail-transition);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 700; line-height: 1.25; letter-spacing: 0.02em; }
p { max-width: 68ch; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--accent);
  color: var(--accent-ink);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  border-radius: 2px;
  transform: translateY(-220%);
  transition: transform 0.18s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 5. 头部外壳 ---------- */
.site-header { position: relative; }

/* 5.1 左侧品牌轨道 */
.brand-rail {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--rail-w);
  display: grid;
  grid-template-rows: 1fr auto auto;
  justify-items: center;
  align-items: center;
  gap: 16px;
  padding: calc(var(--util-h) + 26px) 0 22px;
  background: linear-gradient(180deg, rgba(200, 255, 61, 0.06), rgba(200, 255, 61, 0) 34%), var(--arena);
  border-right: 1px solid var(--line);
  z-index: 75;
  transition: width var(--rail-transition);
}
.brand-rail::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: var(--util-h);
  border-bottom: 1px solid var(--line);
  pointer-events: none;
}
.brand-rail::after {
  content: "";
  position: absolute;
  top: calc(var(--util-h) / 2 - 3px);
  left: 50%;
  width: 6px;
  height: 6px;
  margin-left: -3px;
  background: var(--accent);
  pointer-events: none;
}
.brand-rail__mark { display: grid; justify-items: center; gap: 14px; }
.brand-rail__word {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  line-height: 1;
  letter-spacing: 0.34em;
  color: var(--ice);
  transition: font-size var(--rail-transition), letter-spacing var(--rail-transition);
}
.brand-rail__code {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--accent-text);
}
.brand-rail__meta {
  writing-mode: vertical-rl;
  font-size: 10px;
  letter-spacing: 0.3em;
  color: var(--fog);
}
.rail-toggle {
  display: grid;
  justify-items: center;
  gap: 7px;
  padding: 9px 6px;
  border: 1px solid var(--line);
  border-radius: 2px;
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}
.rail-toggle:hover { border-color: var(--accent); background: rgba(200, 255, 61, 0.08); }
.rail-toggle__dot { width: 8px; height: 8px; background: var(--accent); }
.rail-toggle__text {
  writing-mode: vertical-rl;
  font-size: 10px;
  letter-spacing: 0.24em;
  color: var(--fog);
}
html[data-scrolled="true"] .brand-rail__word { font-size: 14px; letter-spacing: 0.2em; }
html[data-scrolled="true"] .brand-rail__meta,
html[data-scrolled="true"] .brand-rail__code { display: none; }

/* 5.2 顶部工具带 */
.util-bar {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  right: var(--nav-w);
  height: var(--util-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding-inline: 16px;
  background: var(--arena);
  border-bottom: 1px solid var(--line);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--fog);
  z-index: 70;
  transition: left var(--rail-transition), right var(--rail-transition);
}
.util-bar__search { display: flex; align-items: center; gap: 10px; min-width: 0; }
.util-bar__label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  color: var(--accent-text);
}
.util-bar__input {
  width: clamp(120px, 18vw, 230px);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  padding: 2px 2px 4px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ice);
  border-radius: 0;
}
.util-bar__input::placeholder { color: var(--fog); opacity: 0.8; }
.util-bar__input:focus { border-bottom-color: var(--accent); }
.util-bar__issue {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--fog);
  white-space: nowrap;
}
.util-bar__dot {
  width: 6px;
  height: 6px;
  flex: none;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(200, 255, 61, 0.16);
}
.util-bar__actions { display: flex; align-items: center; gap: 18px; }
.util-bar__link {
  position: relative;
  padding-block: 2px;
  letter-spacing: 0.18em;
  color: var(--fog);
  transition: color 0.18s var(--ease);
}
.util-bar__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.18s var(--ease);
}
.util-bar__link:hover { color: var(--accent-text); }
.util-bar__link:hover::after { transform: scaleX(1); }

/* 5.3 移动顶栏 */
.top-bar {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--top-bar-h);
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-inline: 16px;
  background: var(--arena);
  border-bottom: 1px solid var(--line);
  z-index: 100;
}
.top-bar__brand {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  letter-spacing: 0.22em;
  color: var(--ice);
}
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--ice);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  transition: border-color 0.18s var(--ease);
}
.nav-toggle:hover { border-color: var(--accent); }
.nav-toggle__bars { display: grid; gap: 4px; width: 18px; }
.nav-toggle__bars span {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 5.4 右侧栏目轨道 */
.nav-rail {
  position: fixed;
  top: 0;
  bottom: 0;
  right: 0;
  width: var(--nav-w);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 14px;
  padding: var(--util-h) 12px 26px;
  background: linear-gradient(200deg, rgba(79, 216, 196, 0.05), rgba(79, 216, 196, 0) 40%), var(--arena);
  border-left: 1px solid var(--line);
  z-index: 78;
  transition: width var(--rail-transition);
}
.nav-rail::before {
  content: "";
  position: absolute;
  top: var(--util-h);
  left: 0;
  right: 0;
  height: 1px;
  background: var(--line);
  pointer-events: none;
}
.nav-rail__title {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.4em;
  text-align: center;
  color: var(--fog);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.nav-rail__list { counter-reset: navlink; display: grid; gap: 4px; }
.nav-rail__link {
  display: block;
  padding: 9px 8px;
  font-size: 13px;
  letter-spacing: 0.08em;
  white-space: nowrap;
  color: var(--fog);
  border: 1px solid transparent;
  border-radius: 2px;
  transition: color 0.16s var(--ease), background 0.16s var(--ease), border-color 0.16s var(--ease);
}
.nav-rail__link::before {
  counter-increment: navlink;
  content: counter(navlink, decimal-leading-zero);
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: var(--line);
  margin-bottom: 1px;
}
.nav-rail__link:hover { color: var(--ice); border-color: var(--line); }
.nav-rail__link[aria-current="page"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
  font-weight: 700;
}
.nav-rail__link[aria-current="page"]::before { color: var(--accent-ink); opacity: 0.65; }
.nav-rail__cta {
  display: block;
  margin-top: 6px;
  padding: 12px 6px;
  text-align: center;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: 2px;
  transition: filter 0.18s var(--ease), transform 0.18s var(--ease);
}
.nav-rail__cta:hover { filter: brightness(1.07); transform: translateY(-1px); }

/* ---------- 6. 通用排版与布局组件 ---------- */
.wrap {
  width: 100%;
  max-width: 1320px;
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 64px);
}
.section { padding-block: clamp(56px, 8vw, 128px); border-top: 1px solid var(--line); }
.section__head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px 24px; margin-bottom: clamp(24px, 4vw, 48px); }

.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--fog);
}
.eyebrow::before { content: ""; width: 26px; height: 1px; flex: none; background: var(--accent); }

.display {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 0.94;
  letter-spacing: 0.04em;
  color: var(--ice);
  text-wrap: balance;
}
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: 0.08em; }
.rule { height: 1px; border: 0; background: var(--line); }

.grid { display: grid; gap: clamp(16px, 2.4vw, 32px); }
.grid--split { grid-template-columns: minmax(0, 7fr) minmax(0, 4fr); }

/* ---------- 7. 按钮 / 标签 / 分段 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: transparent;
  color: var(--ice);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  transition: background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease), transform 0.18s var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn--primary:hover { filter: brightness(1.06); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent-text); background: rgba(200, 255, 61, 0.08); }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--pitch);
  color: var(--fog);
  font-size: 13px;
  letter-spacing: 0.06em;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease), background 0.18s var(--ease), box-shadow 0.18s var(--ease);
}
.chip:hover { border-color: var(--cyan); color: var(--ice); }
.chip[aria-pressed="true"] {
  border-color: var(--accent);
  color: var(--accent-text);
  background: rgba(200, 255, 61, 0.1);
  box-shadow: 0 0 0 3px rgba(200, 255, 61, 0.1);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--fog);
}
.tag--live { border-color: var(--accent); color: var(--accent-text); }

/* ---------- 8. 面包屑 ---------- */
.breadcrumb { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.14em; color: var(--fog); }
.breadcrumb__list { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.breadcrumb__item { display: inline-flex; align-items: center; gap: 10px; }
.breadcrumb__item + .breadcrumb__item::before { content: "/"; color: var(--line); }
.breadcrumb__link { transition: color 0.16s var(--ease); }
.breadcrumb__link:hover { color: var(--accent-text); }
.breadcrumb__item[aria-current="page"] { color: var(--ice); }

/* ---------- 9. 图片容器基础规则 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: linear-gradient(135deg, var(--pitch) 0%, var(--board) 100%);
}
.media::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: 0.18;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
}
.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }
.media__img { width: 100%; height: 100%; object-fit: cover; }
.media__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 8px 12px;
  background: rgba(6, 18, 15, 0.82);
  color: #F1F4F2;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
}

/* ---------- 10. 滚动进度 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 130;
  pointer-events: none;
}
.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--accent), var(--cyan) 60%, var(--orange));
}

/* ---------- 11. 页脚 ---------- */
.site-footer {
  position: relative;
  overflow: hidden;
  margin-block-start: clamp(64px, 10vw, 140px);
  background: var(--pitch);
  border-top: 1px solid var(--line);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.55;
}
.footer__inner {
  width: 100%;
  max-width: 1320px;
  margin-inline: auto;
  padding: clamp(40px, 6vw, 80px) clamp(20px, 4vw, 64px) 32px;
}
.footer__top {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.4fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: start;
}
.footer__word {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 6vw, 74px);
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--ice);
}
.footer__tagline { margin-top: 14px; font-size: 14px; letter-spacing: 0.12em; color: var(--fog); }
.footer__meta {
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--fog);
  opacity: 0.85;
}
.footer__cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.footer__col-title {
  padding-bottom: 10px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--fog);
}
.footer__list { display: grid; gap: 8px; }
.footer__link {
  font-size: 14px;
  color: var(--ice);
  opacity: 0.86;
  transition: color 0.16s var(--ease), opacity 0.16s var(--ease);
}
.footer__link:hover { color: var(--accent-text); opacity: 1; }
.footer__contact {
  margin-top: clamp(32px, 5vw, 56px);
  padding-top: 24px;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 8px;
}
.footer__line {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ice);
  word-break: break-word;
}
.footer__note { max-width: 66ch; font-size: 12.5px; line-height: 1.8; color: var(--fog); }
.footer__bottom {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--fog);
}
.footer__legal-links { display: flex; flex-wrap: wrap; gap: 18px; }
.footer__legal-link { transition: color 0.16s var(--ease); }
.footer__legal-link:hover { color: var(--accent-text); }
.footer__legal { color: var(--fog); opacity: 0.8; }

/* ---------- 12. 显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.22s var(--ease), transform 0.22s var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 13. 响应式 ---------- */
@media (max-width: 1279px) {
  :root { --rail-w: 72px; --nav-w: 112px; }
  .brand-rail__word { font-size: 17px; letter-spacing: 0.28em; }
  .nav-rail { padding-inline: 10px; }
}

@media (max-width: 1199px) {
  .util-bar__issue { display: none; }
}

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

@media (max-width: 1023px) {
  body {
    padding-inline-start: 0;
    padding-inline-end: 0;
    padding-block-start: var(--top-bar-h);
  }
  .brand-rail, .util-bar { display: none; }
  .top-bar { display: flex; }

  .nav-rail {
    top: var(--top-bar-h);
    bottom: 0;
    right: 0;
    left: auto;
    width: min(86vw, 360px);
    justify-content: flex-start;
    gap: 10px;
    padding: 28px 20px 32px;
    background: var(--pitch);
    border-left: 1px solid var(--line);
    transform: translateX(101%);
    visibility: hidden;
    z-index: 95;
    transition: transform 0.28s var(--ease), visibility 0.28s var(--ease);
  }
  .nav-rail[data-open="true"] { transform: none; visibility: visible; }
  .nav-rail::before { display: none; }
  .nav-rail__title { text-align: left; padding-bottom: 12px; }
  .nav-rail__list { gap: 2px; }
  .nav-rail__link { font-size: 16px; padding: 14px 12px; letter-spacing: 0.1em; }
  .nav-rail__link::before { display: inline-block; margin-right: 10px; margin-bottom: 0; vertical-align: 1px; }
  .nav-rail__cta { margin-top: 18px; padding: 14px 10px; font-size: 13px; }
}

@media (max-width: 767px) {
  body { font-size: 16px; }
  .footer__cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
  .footer__bottom { flex-direction: column; align-items: flex-start; gap: 10px; }
  .footer__legal-links { gap: 14px; }
}

/* ---------- 14. 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;
  }
  [data-reveal] { opacity: 1; transform: none; }
}