/* ============================================================
   火博体育赛场 — 共享外壳样式 /assets/site.css
   模块：reset · 变量 · 排版 · 工具类 · 头部 · 页脚 · 响应式
   ============================================================ */

/* ---------- 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, figure, blockquote {
  margin: 0;
}

ul, ol { padding: 0; list-style: none; }

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

a { color: inherit; }

table { border-collapse: collapse; width: 100%; }

/* ---------- 变量 ---------- */
:root {
  /* 品牌色 */
  --lava: #E8451F;
  --lava-deep: #B83212;
  --char: #1A1A1A;
  --graph: #2C2C2C;
  --stone: #6B6B63;
  --cream: #F4EFE6;
  --cream-deep: #E9E2D4;
  --clay: #C77A4A;
  --data: #1FB6A6;
  --data-deep: #0F6F68;
  --paper: #FFFFFF;
  --track: #F2C14E;

  /* 结构色 */
  --line: #DFD7C7;
  --line-dark: #3A3936;
  --ink-soft: #4A4740;
  --ink-mute: #807B72;

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

  /* 节奏 */
  --head-h: 76px;
  --ease: cubic-bezier(.3, .7, .3, 1);
}

/* ---------- 基础排版 ---------- */
body {
  background-color: var(--cream);
  color: var(--char);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.03em;
}

h1 { font-size: clamp(34px, 5vw, 64px); }
h2 { font-size: clamp(26px, 3.4vw, 44px); }
h3 { font-size: clamp(19px, 2vw, 26px); }

p { text-wrap: pretty; }

strong, b { font-weight: 800; }

.mono,
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

/* ---------- 焦点 ---------- */
:focus-visible {
  outline: 2px solid var(--data);
  outline-offset: 3px;
}

.site-head :focus-visible,
.site-foot :focus-visible {
  outline-color: var(--track);
}

/* ---------- 布局工具 ---------- */
.wrap {
  width: min(1280px, 100% - 48px);
  margin-inline: auto;
}

.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background-color .18s var(--ease),
              border-color .18s var(--ease),
              color .18s var(--ease),
              transform .18s var(--ease);
}

.btn:hover { transform: translateX(2px); }

.btn--lava {
  background-color: var(--lava);
  color: #141312;
  border-color: var(--lava);
}

.btn--lava:hover,
.btn--lava:focus-visible {
  background-color: var(--lava-deep);
  border-color: var(--lava-deep);
  color: var(--paper);
}

.btn--ghost {
  background-color: transparent;
  color: var(--cream);
  border-color: var(--line-dark);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--lava);
  color: var(--paper);
}

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.5;
  white-space: nowrap;
  background-color: var(--cream-deep);
  color: var(--ink-soft);
  border: 1px solid var(--line);
}

.tag--data {
  background-color: rgba(31, 182, 166, .14);
  border-color: rgba(15, 111, 104, .38);
  color: var(--data-deep);
}

.tag--lava {
  background-color: rgba(232, 69, 31, .1);
  border-color: rgba(184, 50, 18, .38);
  color: var(--lava-deep);
}

.tag--track {
  background-color: rgba(242, 193, 78, .24);
  border-color: rgba(199, 122, 74, .5);
  color: #6E4E12;
}

/* ---------- 面板 ---------- */
.panel {
  background-color: #FBF7EF;
  border: 1px solid var(--line);
  padding: 24px;
}

.panel--dark {
  background-color: var(--graph);
  border-color: var(--line-dark);
  color: var(--cream);
}

/* ---------- 图片容器基础规则 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background-color: var(--graph);
  border: 1px solid var(--line);
}

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

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }

/* ---------- 正文容器 ---------- */
.prose {
  max-width: 74ch;
  font-size: 16.5px;
  line-height: 1.78;
  color: #2A2925;
}

.prose > * + * { margin-top: 1em; }

.prose h2 {
  font-size: clamp(24px, 3vw, 32px);
  margin-top: 1.7em;
  letter-spacing: -0.03em;
}

.prose h3 {
  font-size: 19px;
  margin-top: 1.5em;
}

.prose a {
  color: var(--data-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.prose a:hover { color: var(--lava-deep); }

/* ---------- 面包屑 ---------- */
.crumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--stone);
}

.crumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.crumbs-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: #B9B2A4;
}

.crumbs-list a {
  text-decoration: none;
  color: var(--data-deep);
  transition: color .16s var(--ease);
}

.crumbs-list a:hover { color: var(--lava-deep); }

/* ---------- 显现协议 ---------- */
[data-reveal="wait"] {
  opacity: 0;
  transform: translateY(14px);
}

[data-reveal="in"] {
  opacity: 1;
  transform: none;
  transition: opacity .42s var(--ease), transform .42s var(--ease);
}

/* ============================================================
   跳转链接
   ============================================================ */
.skip-link {
  position: absolute;
  left: 12px;
  top: -72px;
  z-index: 200;
  padding: 12px 20px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
  background-color: var(--track);
  color: #141312;
  transition: top .18s var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  top: 12px;
  outline-color: var(--char);
}

/* ============================================================
   头部 — 炭黑导轨 / 左右分置
   ============================================================ */
.site-head {
  position: sticky;
  top: 0;
  z-index: 80;
  background-color: var(--char);
  color: var(--cream);
  border-bottom: 1px solid #33322F;
}

.head-rail {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: var(--head-h);
  position: relative;
}

/* 品牌锁定 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: inherit;
  flex: none;
}

.brand-mark {
  width: 38px;
  height: 38px;
  flex: none;
  display: grid;
  place-items: center;
  background-color: var(--lava);
  color: #141312;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  gap: 2px;
}

.brand-name {
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--ink-mute);
}

/* 两步直达路径芯片 */
.route-chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: none;
  padding: 7px 13px 7px 11px;
  text-decoration: none;
  color: var(--cream);
  border: 1px solid var(--line-dark);
  font-size: 12px;
  line-height: 1.4;
  transition: border-color .18s var(--ease), background-color .18s var(--ease);
}

.route-chip:hover,
.route-chip:focus-visible {
  border-color: var(--lava);
  background-color: #232220;
}

.route-chip-tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--data);
}

.route-chip-track {
  display: inline-flex;
  align-items: center;
}

.route-chip-node {
  width: 7px;
  height: 7px;
  background-color: var(--stone);
  transform: rotate(45deg);
  transition: background-color .18s var(--ease);
}

.route-chip-node--end { background-color: var(--lava); }

.route-chip-rail {
  width: 22px;
  height: 1px;
  background-color: var(--line-dark);
  transition: background-color .18s var(--ease);
}

.route-chip:hover .route-chip-node,
.route-chip:focus-visible .route-chip-node { background-color: var(--lava); }

.route-chip:hover .route-chip-rail,
.route-chip:focus-visible .route-chip-rail { background-color: var(--lava); }

.route-chip-goal {
  font-family: var(--font-head);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper);
}

/* 右侧工具区 */
.head-right {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  margin-left: auto;
}

/* 主导航 */
.head-nav { display: block; }

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-list a {
  position: relative;
  isolation: isolate;
  display: block;
  padding: 9px 13px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.4;
  color: #CDC7BA;
  text-decoration: none;
  transition: color .16s var(--ease);
}

.nav-list a::before {
  content: "";
  position: absolute;
  inset: 2px 0;
  z-index: -1;
  background-color: var(--lava);
  transform: skewX(-16deg) scaleX(0);
  transform-origin: left center;
  transition: transform .18s var(--ease);
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 3px;
  height: 2px;
  background-color: var(--data);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .18s var(--ease);
}

.nav-list a:hover,
.nav-list a:focus-visible { color: #141312; }

.nav-list a:hover::before,
.nav-list a:focus-visible::before { transform: skewX(-16deg) scaleX(1); }

.nav-list a[aria-current="page"] { color: var(--paper); }

.nav-list a[aria-current="page"]::after { transform: scaleX(1); }

.nav-list a[aria-current="page"]:hover::before,
.nav-list a[aria-current="page"]:focus-visible::before { transform: skewX(-16deg) scaleX(1); }

/* 移动端栏目按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line-dark);
  color: #CDC7BA;
  font-family: var(--font-head);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  line-height: 1.4;
  transition: border-color .18s var(--ease), color .18s var(--ease);
}

.nav-toggle:hover,
.nav-toggle:focus-visible {
  border-color: var(--lava);
  color: var(--paper);
}

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 14px;
}

.nav-toggle-bars span {
  display: block;
  width: 14px;
  height: 2px;
  background-color: currentColor;
  transition: transform .18s var(--ease), opacity .18s 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);
}

/* 收藏按钮 */
.fav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 13px;
  border: 1px solid var(--line-dark);
  color: #CDC7BA;
  font-family: var(--font-head);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.05em;
  line-height: 1.4;
  transition: border-color .18s var(--ease),
              color .18s var(--ease),
              background-color .18s var(--ease);
}

.fav-toggle:hover,
.fav-toggle:focus-visible {
  border-color: var(--track);
  color: var(--paper);
}

.fav-toggle-mark {
  width: 9px;
  height: 9px;
  flex: none;
  background-color: var(--stone);
  transform: rotate(45deg);
  transition: background-color .18s var(--ease);
}

.fav-toggle[aria-pressed="true"] {
  background-color: var(--track);
  border-color: var(--track);
  color: #141312;
}

.fav-toggle[aria-pressed="true"] .fav-toggle-mark { background-color: #141312; }

/* 阅读进度计量条 */
.scroll-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}

.scroll-meter span {
  display: block;
  width: 100%;
  height: 100%;
  background-color: var(--lava);
  transform: scaleX(0);
  transform-origin: 0 50%;
}

/* ============================================================
   页脚
   ============================================================ */
.site-foot {
  position: relative;
  overflow: hidden;
  background-color: var(--char);
  color: #CFC9BC;
  padding-top: 6px;
}

.site-foot::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background-image: linear-gradient(
    90deg,
    var(--lava) 0 38%,
    var(--data) 38% 58%,
    var(--clay) 58% 78%,
    var(--graph) 78% 100%
  );
  z-index: 2;
}

.site-foot::after {
  content: "";
  position: absolute;
  inset: 6px 0 0 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    115deg,
    rgba(255, 255, 255, .035) 0 1px,
    transparent 1px 64px
  );
  z-index: 0;
}

.foot-watermark {
  position: absolute;
  right: -16px;
  bottom: -26px;
  z-index: 0;
  font-family: var(--font-head);
  font-size: clamp(88px, 17vw, 210px);
  font-weight: 900;
  line-height: .8;
  letter-spacing: -0.05em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(244, 239, 230, .09);
  pointer-events: none;
  user-select: none;
}

.foot-main {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.1fr;
  gap: 48px;
  padding: 72px 0 48px;
}

.foot-brand { min-width: 0; }

.foot-name {
  font-family: var(--font-head);
  font-size: 28px;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--paper);
}

.foot-note {
  margin-top: 14px;
  max-width: 36ch;
  font-size: 14px;
  line-height: 1.78;
  color: #A29C90;
}

.foot-cta { margin-top: 22px; }

.foot-label {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--data);
}

.foot-list { display: block; }

.foot-list li { display: block; }

.foot-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 0;
  font-size: 14px;
  line-height: 1.6;
  color: #CFC9BC;
  text-decoration: none;
  transition: color .16s var(--ease), transform .16s var(--ease);
}

.foot-list a::before {
  content: "";
  display: block;
  width: 0;
  height: 1px;
  background-color: var(--lava);
  transition: width .16s var(--ease);
}

.foot-list a:hover,
.foot-list a:focus-visible {
  color: var(--paper);
  transform: translateX(2px);
}

.foot-list a:hover::before,
.foot-list a:focus-visible::before { width: 12px; }

.foot-list--plain li {
  display: flex;
  gap: 10px;
  padding: 5px 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: #CFC9BC;
  word-break: break-word;
}

.foot-key {
  flex: none;
  min-width: 34px;
  padding-top: 1px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink-mute);
}

.foot-hours {
  margin-top: 14px;
  max-width: 30ch;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--ink-mute);
}

.foot-base {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding: 20px 0 28px;
  border-top: 1px solid var(--line-dark);
}

.foot-legal {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ink-mute);
}

/* ============================================================
   响应式 — 平板
   ============================================================ */
@media (max-width: 1060px) {
  .head-rail {
    flex-wrap: wrap;
    row-gap: 10px;
    column-gap: 12px;
    padding-block: 12px;
    min-height: 0;
  }

  .brand { order: 1; }

  .head-right {
    order: 2;
    margin-left: auto;
    gap: 10px;
  }

  .route-chip {
    order: 3;
    flex: 1 1 100%;
    justify-content: center;
  }

  .nav-toggle { display: inline-flex; }

  .head-nav {
    position: absolute;
    top: calc(100% + 12px);
    right: 0;
    z-index: 90;
    display: none;
    width: min(300px, 82vw);
    padding: 8px;
    background-color: #141414;
    border: 1px solid var(--line-dark);
  }

  .head-nav[data-open] {
    display: block;
    animation: nav-drop .18s var(--ease);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-list a {
    padding: 11px 14px;
    font-size: 14.5px;
  }

  .nav-list a::after {
    left: 14px;
    right: auto;
    width: 26px;
    bottom: 6px;
  }

  .foot-main {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
    padding: 56px 0 36px;
  }

  .foot-brand { grid-column: 1 / -1; }

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

@keyframes nav-drop {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: none; }
}

/* ============================================================
   响应式 — 手机
   ============================================================ */
@media (max-width: 600px) {
  .wrap { width: calc(100% - 32px); }

  .brand-mark { width: 34px; height: 34px; font-size: 13px; }
  .brand-name { font-size: 17px; }
  .brand-sub { font-size: 10px; letter-spacing: 0.1em; }

  .fav-toggle { padding: 8px 10px; }
  .fav-toggle-text { display: none; }

  .nav-toggle-text { display: none; }
  .nav-toggle { padding: 9px 11px; }

  .route-chip { padding: 7px 10px; gap: 8px; }
  .route-chip-goal { font-size: 12.5px; }

  .foot-main {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
    padding: 48px 0 32px;
  }

  .foot-name { font-size: 24px; }

  .foot-base {
    justify-content: flex-start;
    padding: 18px 0 26px;
  }

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

  .panel { padding: 18px; }

  .btn { padding: 11px 18px; font-size: 14px; }

  .foot-watermark { right: -10px; bottom: -14px; }
}

/* ============================================================
   减少动态偏好
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }

  [data-reveal="wait"],
  [data-reveal="in"] {
    opacity: 1;
    transform: none;
  }

  .btn:hover,
  .foot-list a:hover { transform: none; }
}