/* =========================================================
   爱体育月卡 / assets/site.css
   共享层：reset · 变量 · 中文排版 · 框架头部 · 页脚 · 基础组件
   ========================================================= */

/* ---------- 0. reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  background: #070D0A;
}

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, figcaption, blockquote, dl, dd, table, th, td {
  margin: 0;
}

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

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

a { color: inherit; }

button, input, select, textarea { font: inherit; color: inherit; }

button { border-radius: 0; }

table { border-collapse: collapse; border-spacing: 0; width: 100%; }

hr { border: 0; border-top: 1px solid var(--grid); }

/* ---------- 1. 变量 ---------- */
:root {
  color-scheme: dark;

  --pitch: #0B1F17;   /* 场地深绿 */
  --stand: #143226;   /* 看台苔绿 */
  --grid: #24382C;    /* 网格灰绿 */
  --stone: #8C9A8F;   /* 岩灰 */
  --lime: #C9FF3D;    /* 荧光青柠 */
  --orange: #E4692B;  /* 赛道橙 */
  --clay: #B4553A;    /* 陶土 */
  --board: #F5F2E7;   /* 记分牌白 */
  --ink: #D9D6C8;     /* 正文米白 */
  --void: #070D0A;    /* 近黑板黑 */

  --rail-w: 88px;
  --bar-h: 56px;
  --maxw: 1280px;
  --gutter: 24px;

  --font-head: "PingFang SC", "Source Han Sans SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "PingFang SC", "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --font-serif: "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 2. 基底与网格底纹 ---------- */
body {
  min-height: 100vh;
  padding-top: var(--bar-h);
  padding-left: var(--rail-w);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--pitch);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 20px 20px;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

main { display: block; }

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

/* ---------- 3. 中文排版 ---------- */
h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3 {
  font-family: var(--font-head);
  font-weight: 900;
  font-stretch: 92%;
  letter-spacing: -0.02em;
  line-height: 1.12;
  color: var(--board);
  text-wrap: balance;
}

h1, .h1 { font-size: clamp(34px, 5.6vw, 56px); }
h2, .h2 { font-size: clamp(26px, 3.4vw, 40px); }
h3, .h3 { font-size: clamp(20px, 2.2vw, 28px); }
h4 { font-size: 22px; letter-spacing: -0.01em; }
h5 { font-size: 17px; letter-spacing: 0; }

p { text-wrap: pretty; }

strong, b { font-weight: 900; color: var(--board); }

code, kbd, samp, .mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
  letter-spacing: 0.02em;
  color: var(--lime);
}

::selection { background: var(--lime); color: var(--void); }

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

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 4. 通用排版件 ---------- */
.container {
  width: min(100% - (var(--gutter) * 2), var(--maxw));
  margin-inline: auto;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime);
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--lime);
  flex: 0 0 auto;
}

.lede {
  font-family: var(--font-serif);
  font-size: clamp(18px, 2vw, 23px);
  line-height: 1.65;
  color: var(--board);
  letter-spacing: 0.005em;
}

.prose { max-width: 72ch; }
.prose p + p { margin-top: 1.2em; }
.prose h2 { margin-top: 2.2em; margin-bottom: 0.6em; }
.prose h3 { margin-top: 1.8em; margin-bottom: 0.5em; }
.prose ul { margin: 1.2em 0; }
.prose ul li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 0.5em;
}
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.72em;
  width: 8px; height: 1px;
  background: var(--lime);
}
.prose a {
  color: var(--board);
  text-decoration: underline;
  text-decoration-color: var(--orange);
  text-underline-offset: 3px;
}
.prose a:hover { color: var(--lime); text-decoration-color: var(--lime); }

/* ---------- 5. 栅格与面板 ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}

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

.panel {
  border: 1px solid var(--grid);
  background: var(--stand);
  padding: 20px;
}

.panel--board {
  background: var(--board);
  border-color: rgba(7, 13, 10, 0.14);
  color: var(--void);
}
.panel--board :is(h1, h2, h3, h4, .lede) { color: var(--void); }

/* ---------- 6. 状态标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border: 1px solid var(--grid);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.4;
  color: var(--stone);
  white-space: nowrap;
}
.tag--current { color: var(--lime); border-color: rgba(201, 255, 61, 0.45); }
.tag--diff { color: var(--orange); border-color: rgba(228, 105, 43, 0.45); }
.tag--clay { color: var(--clay); border-color: rgba(180, 85, 58, 0.5); }

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 34px;
  padding: 0 14px;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 13px;
  letter-spacing: 0.01em;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
.btn--lime { background: var(--lime); color: var(--void); }
.btn--lime:hover { background: var(--orange); color: var(--board); }
.btn--ghost { border-color: var(--grid); color: var(--ink); background: transparent; }
.btn--ghost:hover { border-color: var(--lime); color: var(--lime); }
.btn--board { background: var(--void); color: var(--board); }
.btn--board:hover { background: var(--clay); }

/* ---------- 8. 面包屑 ---------- */
.crumbs { margin-bottom: 28px; }
.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--stone);
}
.crumbs li { display: flex; align-items: center; gap: 10px; }
.crumbs li + li::before {
  content: "";
  width: 10px;
  height: 1px;
  background: var(--grid);
  flex: 0 0 auto;
}
.crumbs a { color: var(--stone); text-decoration: none; }
.crumbs a:hover { color: var(--lime); }
.crumbs [aria-current="page"] { color: var(--board); }

/* ---------- 9. 分段控件 ---------- */
.segmented {
  display: inline-flex;
  flex-wrap: wrap;
  border: 1px solid var(--grid);
  background: var(--stand);
}
.segmented [role="tab"] {
  appearance: none;
  background: transparent;
  border: 0;
  border-right: 1px solid var(--grid);
  padding: 9px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--stone);
  cursor: pointer;
  transition: background-color .2s var(--ease), color .2s var(--ease);
}
.segmented [role="tab"]:last-child { border-right: 0; }
.segmented [role="tab"]:hover { color: var(--board); }
.segmented [role="tab"][aria-selected="true"] { background: var(--lime); color: var(--void); }
[role="tabpanel"][hidden] { display: none; }

/* ---------- 10. 图片容器基础规则 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--stand);
  border: 1px solid var(--grid);
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(140, 154, 143, 0.14) 0 1px, transparent 1px 32px);
  pointer-events: none;
}
.media img, .media svg, .media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media__caption {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 2;
  padding: 5px 10px;
  background: rgba(7, 13, 10, 0.8);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
}
.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 4 / 5; }
.media--square { aspect-ratio: 1 / 1; }

/* ---------- 11. 显现动效 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateX(-18px);
  transition: opacity .36s var(--ease), transform .36s var(--ease);
}
[data-reveal].is-inview {
  opacity: 1;
  transform: none;
}

/* =========================================================
   12. 框架头部
   ========================================================= */
.site-frame {
  position: relative;
  z-index: 80;
}

.skip-link {
  position: fixed;
  top: -64px;
  left: 12px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--lime);
  color: var(--void);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 14px;
  text-decoration: none;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 10px; }

/* --- 顶部细线栏 --- */
.frame-bar {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  right: 0;
  z-index: 90;
  height: var(--bar-h);
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 0 20px;
  background: rgba(11, 31, 23, 0.94);
  border-bottom: 1px solid var(--grid);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  color: var(--board);
  text-decoration: none;
}
.brand__mark {
  width: 15px;
  height: 15px;
  background: var(--lime);
  clip-path: polygon(0 0, 100% 12%, 100% 88%, 0 100%);
  transition: background-color .2s var(--ease);
}
.brand:hover .brand__mark { background: var(--orange); }
.brand__name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 17px;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.frame-bar__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--stone);
  white-space: nowrap;
}

.meter {
  position: relative;
  flex: 1 1 120px;
  min-width: 60px;
  height: 12px;
  border-left: 1px solid var(--grid);
  border-right: 1px solid var(--grid);
  overflow: hidden;
}
.meter__ticks {
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px 24px);
}
.meter__fill {
  position: absolute;
  inset: 0;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, rgba(201, 255, 61, 0.1), rgba(201, 255, 61, 0.6));
  transition: transform .12s linear;
}

.frame-bar__stage {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--stone);
  white-space: nowrap;
}
.frame-bar__stage b { color: var(--lime); font-weight: 400; }

.frame-bar__cta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

/* --- 移动端抽屉按钮 --- */
.nav-toggle {
  display: none;
  position: fixed;
  top: 11px;
  right: 14px;
  z-index: 110;
  align-items: center;
  gap: 8px;
  height: 34px;
  padding: 0 11px;
  background: rgba(20, 50, 38, 0.92);
  border: 1px solid var(--grid);
  border-radius: 0;
  color: var(--board);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}
.nav-toggle__bars { display: flex; flex-direction: column; gap: 3px; }
.nav-toggle__bars i { display: block; width: 14px; height: 1px; background: currentColor; }
.nav-toggle[aria-expanded="true"] { border-color: var(--lime); color: var(--lime); }

/* --- 左侧竖向刻度栏 --- */
.frame-rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  align-items: stretch;
  padding: 10px 0 14px;
  background: var(--stand);
  border-right: 1px solid var(--grid);
}

.rail-top {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding-bottom: 12px;
  flex: 0 0 auto;
}
.rail-dot { width: 8px; height: 8px; background: var(--lime); }
.rail-line { width: 1px; height: 18px; background: var(--grid); }

.rail-nav {
  flex: 1 1 auto;
  overflow-y: auto;
  overflow-x: hidden;
}
.rail-nav__list { display: flex; flex-direction: column; }

.rail-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 11px 6px;
  border-left: 2px solid transparent;
  color: var(--stone);
  text-align: center;
  text-decoration: none;
  transition: color .2s var(--ease), background-color .2s var(--ease), border-color .2s var(--ease);
}
.rail-link:hover { color: var(--board); background: rgba(201, 255, 61, 0.05); }
.rail-link[aria-current="page"] {
  color: var(--lime);
  border-left-color: var(--lime);
  background: rgba(201, 255, 61, 0.07);
}
.rail-link__idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  opacity: 0.85;
}
.rail-link__label {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 12.5px;
  line-height: 1.35;
  letter-spacing: 0.01em;
}

.rail-scale {
  flex: 0 0 auto;
  display: block;
  width: 30px;
  height: 12px;
  margin: 10px auto 0;
  background-image: repeating-linear-gradient(90deg, var(--grid) 0 1px, transparent 1px 4px);
}

/* =========================================================
   13. 页脚
   ========================================================= */
.site-foot {
  position: relative;
  z-index: 5;
  background: var(--void);
  border-top: 1px solid var(--grid);
  color: var(--stone);
  font-size: 14px;
}

.foot-inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 56px var(--gutter) 40px;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr 1.4fr;
  gap: 36px var(--gutter);
}

.foot-brand {
  display: inline-block;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 22px;
  letter-spacing: -0.01em;
  color: var(--board);
  text-decoration: none;
}
.foot-brand:hover { color: var(--lime); }

.foot-summary {
  margin-top: 12px;
  max-width: 28ch;
  line-height: 1.7;
  color: var(--ink);
}
.foot-meta {
  margin-top: 10px;
  max-width: 32ch;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--stone);
}

.foot-copy-group {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.copy-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  background: transparent;
  border: 1px solid var(--grid);
  border-radius: 0;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: background-color .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}
.copy-chip:hover { border-color: var(--lime); color: var(--lime); }
.copy-chip[data-copied="true"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--void);
}

.foot-col__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--lime);
}
.foot-col ul { display: flex; flex-direction: column; gap: 10px; }
.foot-col a {
  color: var(--ink);
  font-size: 14px;
  text-decoration: none;
  transition: color .2s var(--ease);
}
.foot-col a:hover { color: var(--lime); }

.foot-contact p {
  margin-bottom: 10px;
  line-height: 1.7;
  color: var(--stone);
  overflow-wrap: anywhere;
}

.foot-base {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 18px var(--gutter) 34px;
  border-top: 1px solid var(--grid);
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--stone);
}
.foot-base__item { white-space: nowrap; }

/* =========================================================
   14. 响应式
   ========================================================= */
@media (max-width: 1340px) {
  .frame-bar__tag { display: none; }
}

@media (max-width: 1180px) {
  .frame-bar__stage { display: none; }
}

@media (max-width: 1023px) {
  :root { --rail-w: 0px; }

  body { background-attachment: scroll; }

  .frame-bar {
    padding: 0 104px 0 16px;
    gap: 12px;
  }

  .frame-bar__cta { display: none; }

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

  .frame-rail {
    width: 280px;
    transform: translateX(-100%);
    transition: transform .28s var(--ease);
    padding-top: 14px;
  }
  .frame-rail[data-open] {
    transform: translateX(0);
    box-shadow: 24px 0 64px rgba(7, 13, 10, 0.62);
  }

  .rail-top {
    flex-direction: row;
    align-items: center;
    gap: 10px;
    padding: 8px 20px 16px;
  }
  .rail-line { width: 22px; height: 1px; }

  .rail-nav__list { width: 100%; }

  .rail-link {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 14px;
    padding: 14px 20px;
    border-left: 0;
    border-bottom: 1px solid var(--grid);
    text-align: left;
  }
  .rail-link[aria-current="page"] {
    border-left: 0;
    box-shadow: inset 3px 0 0 var(--lime);
  }
  .rail-link__idx { font-size: 11px; }
  .rail-link__label { font-size: 16px; }

  .rail-scale { display: none; }

  html.nav-open, html.nav-open body { overflow: hidden; }

  .foot-inner {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px 20px;
    padding-top: 44px;
  }
  .foot-lead { grid-column: 1 / -1; }
  .foot-contact { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  :root { --gutter: 18px; }

  body { font-size: 16px; }

  .brand__name { font-size: 15px; }
  .frame-bar { padding-right: 96px; }
  .meter { flex: 1 1 auto; min-width: 48px; }

  .grid, .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }

  .segmented { display: flex; width: 100%; }
  .segmented [role="tab"] { flex: 1 1 auto; text-align: center; padding: 9px 10px; }

  .foot-inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .foot-base {
    flex-direction: column;
    gap: 8px;
    padding-bottom: 28px;
  }
  .foot-base__item { white-space: normal; }
}

@media (max-width: 420px) {
  .foot-inner { grid-template-columns: minmax(0, 1fr); }
  .foot-col, .foot-contact { grid-column: 1 / -1; }
}

/* ---------- 15. 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  [data-reveal] { opacity: 1; transform: none; }
  .meter__fill { transition: none; }
  .frame-rail { transition: none; }
}