/* ============================================================
   28圈赛事 · 简体中文站 — /assets/site.css
   共享外壳：reset / 变量 / 中英排版 / 页头 / 页脚 / 基础组件
   ============================================================ */

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

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

body {
  margin: 0;
  background: var(--bg-deep);
  color: var(--text);
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.85;
  font-weight: 400;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 { margin: 0; font-weight: 300; line-height: 1.05; letter-spacing: -0.02em; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; padding: 0; }
table { border-collapse: collapse; border-spacing: 0; width: 100%; }
hr { border: 0; border-top: 1px solid var(--line); margin: 0; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 色彩 */
  --bg-deep:   #0E1620;
  --bg-panel:  #16212E;
  --bg-row:    #1C2836;
  --line:      #5D7290;
  --line-soft: rgba(93, 114, 144, 0.32);
  --line-hair: rgba(93, 114, 144, 0.18);
  --text:      #E8EEF6;
  --text-dim:  #8FA3BD;
  --accent:    #2FE6C8;
  --accent-alt:#FF8A3D;
  --violet:    #3A5CFF;
  --teal-deep: #0B3B3A;

  /* 渐变体系（仅三处使用） */
  --grad-frame:
    linear-gradient(155deg, rgba(58, 92, 255, 0.16) 0%, rgba(11, 59, 58, 0.55) 42%, var(--bg-panel) 100%);
  --grad-bar:
    linear-gradient(90deg, rgba(47, 230, 200, 0.14) 0%, rgba(58, 92, 255, 0.14) 48%, rgba(255, 138, 61, 0.10) 100%);

  /* 字体 */
  --font-cn: "Noto Sans SC", "Source Han Sans SC", "PingFang SC",
             "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Cascadia Mono",
               "Roboto Mono", "DejaVu Sans Mono", ui-monospace, monospace;

  /* 尺度 */
  --max: 1360px;
  --rail: 268px;
  --gap: 40px;
  --gap-s: 20px;
  --radius: 2px;

  /* 动效 */
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur-fast: 140ms;
  --dur: 180ms;
  --dur-slow: 400ms;
}

/* ---------- 3. 排版基元 ---------- */
.mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
}

.wrap {
  width: min(100% - 40px, var(--max));
  margin-inline: auto;
}

.prose {
  max-width: 68ch;
  color: var(--text);
  font-size: 17px;
  line-height: 1.85;
}
.prose p + p { margin-top: 1.1em; }
.prose a {
  color: var(--accent);
  border-bottom: 1px solid rgba(47, 230, 200, 0.4);
  padding-bottom: 1px;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.prose a:hover { border-bottom-color: var(--accent); }
.prose strong { font-weight: 500; color: var(--text); }
.prose code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--bg-panel);
  border: 1px solid var(--line-hair);
  padding: 1px 6px;
}

/* ---------- 4. 焦点与可达性 ---------- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius);
}

.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translate(-50%, -120%);
  z-index: 200;
  background: var(--accent);
  color: #04120F;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  padding: 10px 20px;
  transition: transform var(--dur) var(--ease);
}
.skip-link:focus-visible {
  transform: translate(-50%, 0);
  outline-offset: -4px;
}

/* ---------- 5. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-deep);
  border-bottom: 1px solid var(--line-hair);
}

/* 5.1 上层品牌条 */
.header-bar {
  border-bottom: 1px solid var(--line-hair);
  transition: padding var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.header-bar-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  padding-block: 18px;
  transition: padding var(--dur) var(--ease);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-shrink: 0;
}
.brand-code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--accent);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1;
  position: relative;
}
.brand-code::after {
  content: "";
  position: absolute;
  inset: 4px;
  border: 1px solid rgba(47, 230, 200, 0.28);
  pointer-events: none;
}
.brand-body { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.brand-name {
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--text);
  white-space: nowrap;
}
.brand-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  white-space: nowrap;
}

.header-status {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-inline-start: auto;
  color: var(--text-dim);
  white-space: nowrap;
}
.header-status .mono { color: var(--text-dim); }
.status-sep { color: var(--line); font-family: var(--font-mono); font-size: 12px; }
.status-pulse {
  width: 7px;
  height: 7px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 0 rgba(47, 230, 200, 0.6);
  animation: pulse-ring 3s var(--ease) infinite;
  flex-shrink: 0;
}
@keyframes pulse-ring {
  0%   { box-shadow: 0 0 0 0 rgba(47, 230, 200, 0.55); }
  70%  { box-shadow: 0 0 0 9px rgba(47, 230, 200, 0); }
  100% { box-shadow: 0 0 0 0 rgba(47, 230, 200, 0); }
}

.header-tools {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.tool-link,
.tool-search {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 7px 13px;
  border: 1px solid var(--line-soft);
  color: var(--text-dim);
  transition: color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              background var(--dur) var(--ease);
}
.tool-link:hover,
.tool-search:hover {
  color: var(--text);
  border-color: var(--line);
  background: rgba(93, 114, 144, 0.08);
}
.tool-search {
  color: var(--accent);
  border-color: rgba(47, 230, 200, 0.42);
}
.tool-search:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(47, 230, 200, 0.07);
}

/* 5.2 下层栏目条 */
.header-navstrip {
  border-bottom: 1px solid var(--line-hair);
  background: var(--bg-deep);
}
.navstrip-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  padding-block: 0;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 13px 0;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.nav-toggle-label { line-height: 1; }
.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
}
.nav-toggle-bars i {
  display: block;
  height: 1px;
  background: var(--text);
  transition: transform var(--dur) var(--ease),
              opacity var(--dur) var(--ease),
              background var(--dur) var(--ease);
}
.site-header[data-open] .nav-toggle-bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); background: var(--accent); }
.site-header[data-open] .nav-toggle-bars i:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle-bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); background: var(--accent); }

.primary-nav { flex: 1; min-width: 0; }
.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 0;
}
.nav-list > li { display: flex; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 15px 22px 14px;
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--text-dim);
  transition: color var(--dur) var(--ease),
              background var(--dur) var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 22px;
  right: 22px;
  bottom: -1px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}
.nav-link:hover {
  color: var(--text);
  background: rgba(93, 114, 144, 0.07);
}
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] {
  color: var(--accent);
}
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

/* 5.3 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: transparent;
  pointer-events: none;
}
.scroll-progress > span {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--accent), var(--violet) 60%, var(--accent-alt));
  transform: scaleX(0);
  transform-origin: left center;
  will-change: transform;
}

/* 5.4 滚动态压缩 */
.site-header[data-condensed] .header-bar-inner { padding-block: 10px; }
.site-header[data-condensed] .brand-code { width: 38px; height: 38px; font-size: 16px; }
.site-header[data-condensed] .brand-tag { display: none; }
.site-header[data-condensed] .nav-link { padding-block: 11px 10px; }

/* ---------- 6. 页脚 ---------- */
.site-footer {
  margin-top: 96px;
  border-top: 1px solid var(--line-soft);
  background: var(--bg-deep);
  color: var(--text-dim);
  position: relative;
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: var(--grad-bar);
  opacity: 0.7;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--gap);
  padding-block: 62px 46px;
}

.footer-col { min-width: 0; }
.footer-col-title {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line-hair);
}

.footer-list { display: flex; flex-direction: column; gap: 11px; }
.footer-link {
  display: inline-block;
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-dim);
  word-break: break-word;
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.footer-link:hover {
  color: var(--text);
  transform: translateX(3px);
}

.footer-legal {
  border-top: 1px solid var(--line-hair);
}
.footer-legal-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 10px 24px;
  padding-block: 22px 28px;
}
.footer-fine {
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  opacity: 0.75;
}

/* ---------- 7. 基础组件 ---------- */
/* 7.1 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6em;
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 12px 22px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  border-radius: var(--radius);
  transition: color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              background var(--dur) var(--ease),
              transform var(--dur) var(--ease);
  cursor: pointer;
}
.btn:hover { border-color: var(--text); background: rgba(93, 114, 144, 0.1); }
.btn--primary {
  color: var(--accent);
  border-color: rgba(47, 230, 200, 0.55);
  background: rgba(47, 230, 200, 0.06);
}
.btn--primary:hover {
  border-color: var(--accent);
  background: rgba(47, 230, 200, 0.13);
}
.btn--ghost { color: var(--text-dim); border-color: var(--line-hair); }
.btn--ghost:hover { color: var(--text); border-color: var(--line); }

/* 7.2 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 4px 10px;
  border: 1px solid var(--line-soft);
  color: var(--text-dim);
  border-radius: var(--radius);
}
.tag--live { color: var(--accent); border-color: rgba(47, 230, 200, 0.45); }
.tag--alert { color: var(--accent-alt); border-color: rgba(255, 138, 61, 0.5); }

/* 7.3 面包屑 */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding-block: 22px 0;
}
.breadcrumb li { display: inline-flex; align-items: center; gap: 10px; }
.breadcrumb li + li::before {
  content: "/";
  color: var(--line);
}
.breadcrumb a { color: var(--text-dim); transition: color var(--dur) var(--ease); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb [aria-current="page"] { color: var(--text); }

/* 7.4 网格 */
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--gap); }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--gap); }
.grid-4 { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: var(--gap); }

/* 7.5 左右分屏骨架 */
.split-rail {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: var(--gap);
  align-items: start;
}
.split-rail__rail {
  position: sticky;
  top: 108px;
  background: var(--bg-panel);
  border: 1px solid var(--line-hair);
  padding: 22px 20px;
}
.split-rail__main { min-width: 0; }

/* 7.6 全宽数据横条 */
.data-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 24px 48px;
  padding: 26px 30px;
  margin-block: 48px;
  background: var(--grad-bar);
  border: 1px solid var(--line-hair);
  border-left: 2px solid var(--accent);
}
.data-bar__item { display: flex; flex-direction: column; gap: 4px; }
.data-bar-num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent);
}
.data-bar-num--alt { color: var(--accent-alt); }
.data-bar-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-dim);
}

/* 7.7 栏目小标题族 */
.section-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-hair);
}
.section-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  white-space: nowrap;
}
.section-title {
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 300;
  letter-spacing: -0.01em;
  color: var(--text);
}

/* 7.8 技能树式路径 */
.skill-path {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 0;
  margin-block: 8px 4px;
}
.skill-node {
  position: relative;
  flex: 1 1 180px;
  min-width: 150px;
  padding: 16px 20px 18px 26px;
  border-left: 1px solid var(--line);
  color: var(--text-dim);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.skill-node::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 22px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 1px solid var(--accent);
  transition: background var(--dur) var(--ease);
}
.skill-node:hover { color: var(--text); border-color: var(--accent); }
.skill-node:hover::before { background: var(--accent); }
.skill-node__step {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}
.skill-node__title { display: block; font-size: 15px; color: var(--text); line-height: 1.4; }

/* 7.9 响应式图片 / 图表容器 */
.media-frame {
  position: relative;
  display: block;
  border: 1px solid var(--line-hair);
  background: var(--bg-panel);
  overflow: hidden;
  border-radius: var(--radius);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(93, 114, 144, 0.18);
  pointer-events: none;
  z-index: 2;
}
.media-frame > img,
.media-frame > video,
.media-frame > .media-placeholder {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.media-frame[data-ratio="16/9"] > img,
.media-frame[data-ratio="16/9"] > video,
.media-frame[data-ratio="16/9"] > .media-placeholder { aspect-ratio: 16 / 9; }
.media-frame[data-ratio="4/3"] > img,
.media-frame[data-ratio="4/3"] > video,
.media-frame[data-ratio="4/3"] > .media-placeholder { aspect-ratio: 4 / 3; }
.media-frame[data-ratio="1/1"] > img,
.media-frame[data-ratio="1/1"] > video,
.media-frame[data-ratio="1/1"] > .media-placeholder { aspect-ratio: 1 / 1; }
.media-frame[data-ratio="21/9"] > img,
.media-frame[data-ratio="21/9"] > video,
.media-frame[data-ratio="21/9"] > .media-placeholder { aspect-ratio: 21 / 9; }

.media-placeholder {
  display: grid;
  place-items: center;
  text-align: center;
  padding: 24px;
  background:
    repeating-linear-gradient(90deg, transparent 0 27px, rgba(93, 114, 144, 0.13) 27px 28px),
    repeating-linear-gradient(0deg, transparent 0 27px, rgba(93, 114, 144, 0.13) 27px 28px),
    linear-gradient(155deg, var(--bg-panel) 0%, var(--teal-deep) 100%);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
}

/* 7.10 显现 */
.reveal {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity var(--dur-slow) var(--ease),
              transform var(--dur-slow) var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ---------- 8. 响应式 ---------- */
@media (max-width: 1080px) {
  .header-status { display: none; }
  .split-rail { grid-template-columns: 220px minmax(0, 1fr); gap: 28px; }
}

@media (max-width: 900px) {
  :root { --rail: 100%; --gap: 28px; }

  .header-bar-inner { padding-block: 14px; gap: 16px; }
  .brand-tag { display: none; }
  .header-tools .tool-link { display: none; }

  .nav-toggle { display: inline-flex; }
  .navstrip-inner { position: relative; }

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    background: var(--bg-panel);
    border-top: 1px solid var(--line-hair);
    border-bottom: 1px solid var(--line-soft);
    padding: 8px 0 14px;
    max-height: min(70vh, 520px);
    overflow-y: auto;
    z-index: 90;
  }
  .site-header[data-open] .primary-nav { display: block; }

  .nav-list {
    flex-direction: column;
    gap: 0;
    padding-inline: 20px;
  }
  .nav-list > li { display: block; }
  .nav-link {
    display: block;
    width: 100%;
    padding: 14px 4px;
    border-bottom: 1px solid var(--line-hair);
    font-size: 15px;
  }
  .nav-link::after { left: 4px; right: 4px; bottom: -1px; }
  .nav-list > li:last-child .nav-link { border-bottom: 0; }

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 34px 24px;
    padding-block: 46px 34px;
  }
  .footer-legal-inner { flex-direction: column; align-items: flex-start; }

  .split-rail { grid-template-columns: minmax(0, 1fr); }
  .split-rail__rail { position: static; }

  .grid-3, .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 600px) {
  body { font-size: 15.5px; }
  .wrap { width: min(100% - 28px, var(--max)); }

  .brand-code { width: 40px; height: 40px; font-size: 16px; }
  .brand-name { font-size: 13.5px; }
  .header-tools .tool-search { padding: 6px 10px; font-size: 10.5px; }

  .grid-2, .grid-3, .grid-4 { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 30px; }

  .data-bar { padding: 20px 18px; gap: 20px 32px; margin-block: 34px; }
  .data-bar-num { font-size: 24px; }

  .skill-path { gap: 0; }
  .skill-node { flex-basis: 100%; }
}

/* ---------- 9. 减少动效 ---------- */
@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;
  }
  .reveal { opacity: 1; transform: none; }
  .scroll-progress > span { transition: none; }
  .status-pulse { animation: none; box-shadow: 0 0 0 3px rgba(47, 230, 200, 0.18); }
}