/* ==========================================================================
   UC赛场 · /assets/site.css — 共享层：reset / 变量 / 中文字排 / 页头 / 页脚
   深色赛场控制室体系：夜场墨蓝打底，荧光青主路径，赛道橙比赛性元素
   ========================================================================== */

:root {
  --ink-900: #0A1524;
  --ink-800: #101F33;
  --ink-700: #16283E;
  --grid-line: #1E3247;
  --cyan: #2BE3C7;
  --cyan-deep: #0FA894;
  --orange: #FF6B2C;
  --orange-soft: #FFA46B;
  --sage: #7FA093;
  --text: #E9F3F8;
  --text-2: #9DB2C4;
  --ok: #35D07F;
  --warn: #F5B544;

  --font-num: 'Barlow Condensed', 'DIN Alternate', 'Arial Narrow', sans-serif;
  --font-head: 'Source Han Sans SC Heavy', 'Noto Sans SC', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --max: 1440px;
  --pad: clamp(16px, 4vw, 40px);
  --header-h: 68px;
  --gap: 24px;
  --ease: cubic-bezier(.2, .7, .3, 1);
  --line: 1px solid var(--grid-line);
}

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

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

body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background-color: var(--ink-900);
  background-image: linear-gradient(90deg, rgba(30, 50, 71, .55) 0 1px, transparent 1px);
  background-size: clamp(72px, 7.5vw, 140px) 100%;
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img, svg, video { max-width: 100%; height: auto; display: block; }
button, input, select, textarea { font: inherit; color: inherit; }
ul, ol { margin: 0; padding: 0; }

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -.01em;
  color: var(--text);
}

p { margin: 0; }

a {
  color: var(--cyan);
  text-decoration: none;
  text-underline-offset: 3px;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

a:hover { text-decoration: underline; }

hr { border: 0; height: 1px; background: var(--grid-line); margin: 0; }

::selection { background: rgba(43, 227, 199, .28); color: #fff; }

/* ---------- 焦点可见性 ---------- */
:focus { outline: none; }

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

/* ---------- 排版工具 ---------- */
.mono,
.label-mono {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--sage);
}

.num {
  font-family: var(--font-num);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.02em;
  line-height: .95;
}

/* ---------- 布局骨架 ---------- */
.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}

.col-3  { grid-column: span 3; }
.col-4  { grid-column: span 4; }
.col-5  { grid-column: span 5; }
.col-6  { grid-column: span 6; }
.col-7  { grid-column: span 7; }
.col-8  { grid-column: span 8; }
.col-9  { grid-column: span 9; }
.col-12 { grid-column: span 12; }

#main-content {
  display: block;
  scroll-margin-top: calc(var(--header-h) + 16px);
}

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 120;
  padding: 10px 16px;
  background: var(--cyan);
  color: #04161A;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  border-radius: 2px;
  transition: top .16s var(--ease);
}

.skip-link:focus { top: 12px; text-decoration: none; }

/* ==========================================================================
   页头 —— 左右分置：品牌 + 轮次状态点贴左，栏目贴右
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 21, 36, .94);
  border-bottom: 1px solid var(--grid-line);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.header-rail {
  display: flex;
  align-items: center;
  gap: 20px;
  height: var(--header-h);
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.brand-mark {
  position: relative;
  flex: 0 0 auto;
  padding-left: 14px;
  font-family: var(--font-head);
  font-size: 21px;
  font-weight: 900;
  letter-spacing: .02em;
  color: var(--text);
  white-space: nowrap;
}

.brand-mark::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 22px;
  background: linear-gradient(180deg, var(--cyan), var(--orange));
}

.brand-mark:hover { color: var(--cyan); text-decoration: none; }

.brand-status {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--text-2);
  white-space: nowrap;
}

.status-dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 3px rgba(53, 208, 127, .16);
}

.status-text { display: inline-flex; align-items: center; gap: 6px; }

.status-round { color: var(--cyan); }

.status-detail::before {
  content: "·";
  margin-right: 6px;
  color: var(--grid-line);
}

/* ---------- 主导航 ---------- */
.primary-nav { margin-left: auto; }

.nav-list {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list > li { display: flex; }

.nav-list > li + li { border-left: 1px solid var(--grid-line); }

.nav-link {
  position: relative;
  display: block;
  padding: 9px 14px;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .06em;
  color: var(--text-2);
  white-space: nowrap;
  transition: color .16s var(--ease), background-color .16s var(--ease);
}

.nav-link:hover {
  color: var(--text);
  background: rgba(43, 227, 199, .08);
  text-decoration: none;
}

.nav-link[aria-current="page"] { color: var(--cyan); }

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 3px;
  height: 2px;
  background: var(--cyan);
}

/* ---------- 头部动作区 ---------- */
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.header-cta { padding: 9px 16px; }

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 42px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--grid-line);
  border-radius: 2px;
  background: transparent;
  cursor: pointer;
  transition: border-color .16s var(--ease), transform .16s var(--ease);
}

.nav-toggle:hover { border-color: var(--cyan); transform: translateY(-2px); }

.nav-toggle-bar {
  display: block;
  width: 17px;
  height: 2px;
  background: var(--text);
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}

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

/* ---------- 滚动进度 ---------- */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  display: block;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transition: width .1s linear;
}

/* ==========================================================================
   通用按钮
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 2px;
  background: transparent;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .08em;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  transition: transform .16s var(--ease), background-color .16s var(--ease),
              border-color .16s var(--ease), color .16s var(--ease);
}

.btn:hover { transform: translateY(-2px); text-decoration: none; }

.btn-primary {
  background: var(--cyan);
  color: #04161A;
  font-weight: 600;
}

.btn-primary:hover { background: #57F0DA; color: #04161A; }

.btn-primary:active { background: var(--cyan-deep); }

.btn-orange {
  background: var(--orange);
  color: #1A0800;
  font-weight: 600;
}

.btn-orange:hover { background: var(--orange-soft); color: #1A0800; }

.btn-ghost {
  border-color: var(--grid-line);
  color: var(--text-2);
}

.btn-ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(43, 227, 199, .06);
}

/* ==========================================================================
   标签 / 分隔 / 数据卡
   ========================================================================== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--grid-line);
  border-radius: 2px;
  background: rgba(30, 50, 71, .45);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--sage);
}

.tag--cyan { color: var(--cyan); border-color: rgba(43, 227, 199, .38); }
.tag--orange { color: var(--orange); border-color: rgba(255, 107, 44, .38); }

.divider {
  height: 1px;
  border: 0;
  background: var(--grid-line);
  margin: 40px 0;
}

.data-card {
  display: block;
  padding: 18px 20px 20px;
  border: 1px solid var(--grid-line);
  border-radius: 2px;
  background: var(--ink-800);
  transition: transform .16s var(--ease), border-color .16s var(--ease);
}

.data-card:hover {
  transform: translateY(-2px);
  border-color: var(--cyan);
}

.data-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--sage);
}

.data-value {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-num);
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 700;
  line-height: .9;
  letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
  color: var(--text);
}

.data-unit {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--sage);
}

.data-delta {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--cyan);
}

/* ==========================================================================
   章节编号体系
   ========================================================================== */
.section-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
  padding-bottom: 14px;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--grid-line);
}

.section-num {
  font-family: var(--font-num);
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 700;
  line-height: .8;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.section-title {
  font-size: clamp(22px, 2.6vw, 32px);
  margin: 0;
}

.section-kicker {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--sage);
}

/* ==========================================================================
   图片容器（响应式基础规则，供页面阶段放入占位图）
   ========================================================================== */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--grid-line);
  border-radius: 2px;
  background-color: var(--ink-800);
  background-image:
    linear-gradient(135deg, rgba(43, 227, 199, .10), rgba(255, 107, 44, .10)),
    repeating-linear-gradient(45deg, rgba(30, 50, 71, .85) 0 1px, transparent 1px 13px);
}

.media-frame--wide { aspect-ratio: 21 / 9; }

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.92) contrast(1.06) brightness(.92);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(43, 227, 199, .18);
  pointer-events: none;
}

/* ==========================================================================
   正文容器与面包屑
   ========================================================================== */
.prose {
  max-width: 72ch;
  font-size: 17px;
  line-height: 1.75;
  color: var(--text-2);
}

.prose > * + * { margin-top: 1.05em; }

.prose h2,
.prose h3 {
  margin-top: 1.8em;
  color: var(--text);
  font-size: clamp(20px, 2.2vw, 26px);
}

.prose strong { color: var(--text); font-weight: 700; }

.prose ul,
.prose ol { padding-left: 1.2em; }

.prose li + li { margin-top: .45em; }

.breadcrumb { margin: 0 0 28px; }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--text-2);
}

.breadcrumb-list li { display: flex; align-items: center; gap: 8px; }

.breadcrumb-list li + li::before {
  content: "/";
  color: var(--grid-line);
}

.breadcrumb-link { color: var(--text-2); }

.breadcrumb-link:hover { color: var(--cyan); text-decoration: none; }

.breadcrumb-list [aria-current="page"] { color: var(--cyan); }

/* ==========================================================================
   滚动显现
   ========================================================================== */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .4s var(--ease), transform .4s var(--ease);
}

[data-reveal="shown"] {
  opacity: 1;
  transform: none;
}

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  position: relative;
  margin-top: 96px;
  background: var(--ink-800);
  border-top: 1px solid var(--grid-line);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent 38%, transparent 62%, var(--orange));
  opacity: .55;
}

.footer-shell {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(40px, 5vw, 64px) var(--pad) 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.5fr;
  gap: 40px 32px;
}

.footer-col { min-width: 0; }

.footer-col-title {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--sage);
}

.footer-brand {
  position: relative;
  margin: 0 0 10px;
  padding-left: 14px;
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: .02em;
  color: var(--text);
}

.footer-brand::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 22px;
  background: linear-gradient(180deg, var(--cyan), var(--orange));
}

.footer-tagline {
  margin: 0 0 12px;
  color: var(--text);
  font-size: 15px;
}

.footer-note {
  margin: 0;
  max-width: 38ch;
  color: var(--text-2);
  font-size: 14px;
  line-height: 1.7;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links a {
  display: inline-block;
  padding: 5px 0;
  color: var(--text-2);
  font-size: 14px;
  transition: color .16s var(--ease), transform .16s var(--ease);
}

.footer-links a:hover {
  color: var(--cyan);
  transform: translateX(2px);
  text-decoration: none;
}

.footer-meta {
  display: flex;
  flex-direction: column;
  gap: 12px;
  list-style: none;
  margin: 0;
  padding: 0;
  color: var(--text-2);
  font-size: 14px;
  line-height: 1.65;
}

.meta-label {
  display: block;
  margin-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .08em;
  color: var(--sage);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 28px;
  margin-top: 48px;
  padding-top: 22px;
  border-top: 1px solid var(--grid-line);
}

.footer-closing {
  flex: 1 1 320px;
  margin: 0;
  color: var(--text-2);
  font-size: 14px;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-legal a { color: var(--text-2); font-size: 13px; }

.footer-legal a:hover { color: var(--cyan); text-decoration: none; }

.footer-icp {
  margin: 0 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--sage);
}

.footer-copy {
  margin: 18px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--sage);
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: 1.5fr 1fr 1fr; }
  .footer-col:last-child { grid-column: span 3; }
}

@media (max-width: 900px) {
  :root { --header-h: 60px; --gap: 18px; }

  .nav-toggle { display: flex; }

  .primary-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    z-index: 49;
    width: min(320px, 86vw);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    margin: 0;
    padding: 12px;
    background: var(--ink-800);
    border-left: 1px solid var(--grid-line);
    border-bottom: 1px solid var(--grid-line);
    transform: translateX(100%);
    visibility: hidden;
    opacity: 0;
    transition: transform .22s var(--ease), opacity .22s var(--ease), visibility .22s var(--ease);
  }

  .primary-nav[data-open] {
    transform: translateX(0);
    visibility: visible;
    opacity: 1;
  }

  .nav-list { flex-direction: column; align-items: stretch; }

  .nav-list > li + li {
    border-left: 0;
    border-top: 1px solid var(--grid-line);
  }

  .nav-link { padding: 14px 12px; font-size: 13px; }

  .nav-link[aria-current="page"]::after {
    left: 12px;
    right: auto;
    width: 22px;
    bottom: 8px;
  }

  .header-actions { margin-left: auto; }

  .grid-12 > [class*="col-"] { grid-column: span 12; }
}

@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-col:last-child { grid-column: auto; }
  .footer-icp { margin-left: 0; }
  .footer-bottom { margin-top: 36px; }
  .status-detail { display: none; }
  .status-detail::before { content: none; }
  .header-cta { padding: 8px 12px; font-size: 11px; }
}

@media (max-width: 430px) {
  .brand-mark { font-size: 18px; padding-left: 12px; }
  .brand-mark::before { height: 18px; width: 3px; }
  .status-text { display: none; }
  .header-rail { gap: 14px; }
}

/* ==========================================================================
   动效偏好
   ========================================================================== */
@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .btn:hover,
  .data-card:hover,
  .nav-toggle:hover,
  .footer-links a:hover { transform: none; }
}