/* ============================================================
   亚博线上看台 — /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   ============================================================ */

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

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

body,
h1, h2, h3, h4, h5,
p, ul, ol, figure, blockquote, dl, dd { margin: 0; }

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

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

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

a { color: inherit; text-decoration: none; }

table { border-collapse: collapse; }

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

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

/* ---------- 2. 变量 ---------- */
:root {
  --green-deep: #0B2B22;
  --green-mid: #123A2E;
  --lime: #C8FF3D;
  --warm: #F6F2E7;
  --ink: #14161A;
  --rock: #6E7A72;
  --moss: #4E7A55;
  --clay: #C4664A;
  --sand: #E4DFD0;

  --rule: rgba(246, 242, 231, .16);
  --rule-strong: rgba(246, 242, 231, .34);
  --rule-dark: rgba(20, 22, 26, .18);
  --wash: rgba(246, 242, 231, .05);
  --glass: rgba(200, 255, 61, .08);

  --font-body: system-ui, -apple-system, 'Segoe UI', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: ui-monospace, 'Roboto Mono', 'SFMono-Regular', Menlo, Consolas, monospace;

  --rail-w: 96px;
  --topbar-h: 72px;

  --s1: 8px;
  --s2: 16px;
  --s3: 24px;
  --s4: 32px;
  --s5: 48px;
  --s6: 64px;
  --s7: 96px;

  --content: 1280px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  color: var(--warm);
  background: var(--green-deep);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-weight: 500;
  line-height: 1.14;
  letter-spacing: -.02em;
  color: inherit;
  text-wrap: balance;
}

h1 { font-size: clamp(40px, 7vw, 96px); font-weight: 350; letter-spacing: -.03em; }
h2 { font-size: clamp(28px, 3.6vw, 48px); font-weight: 400; }
h3 { font-size: clamp(20px, 2.2vw, 28px); }
h4 { font-size: 18px; }

p { max-width: 38em; }

strong { font-weight: 600; }

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

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 999;
  padding: 10px 18px;
  background: var(--lime);
  color: var(--ink);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .04em;
  transform: translateY(-180%);
  transition: transform 180ms var(--ease);
}

.skip-link:focus { transform: translateY(0); }

/* ---------- 5. 头部外壳 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: var(--topbar-h);
  padding: 12px 16px;
  background: var(--green-deep);
  border-bottom: 1px solid var(--rule-strong);
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-right: auto;
  min-width: 0;
}

.brand__mark {
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  background: var(--lime);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
}

.brand__text { display: flex; flex-direction: column; min-width: 0; }

.brand__name {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -.01em;
  line-height: 1.2;
  white-space: nowrap;
}

.brand__tagline {
  display: none;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--rock);
  line-height: 1.4;
}

/* 分段切换 */
.topbar__switch {
  display: none;
  align-items: stretch;
  border: 1px solid var(--rule-strong);
}

.seg {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 9px 16px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--warm);
  background: transparent;
  transition: background-color 180ms var(--ease), color 180ms var(--ease);
}

.seg + .seg { border-left: 1px solid var(--rule-strong); }

.seg:hover,
.seg:focus-visible { background: var(--lime); color: var(--ink); }

/* 汉堡按钮 */
.nav-toggle {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  padding: 0;
  background: var(--wash);
  border: 1px solid var(--rule-strong);
  color: var(--warm);
  cursor: pointer;
  transition: background-color 180ms var(--ease), border-color 180ms var(--ease);
}

.nav-toggle:hover { background: var(--glass); border-color: var(--lime); }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform 220ms var(--ease), top 220ms var(--ease);
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { top: 10px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  top: 5px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  top: 5px;
  transform: rotate(-45deg);
}

/* ---------- 6. 轨道导航（移动端 = 右侧抽屉） ---------- */
.rail {
  position: fixed;
  inset: 0 0 0 auto;
  width: min(84vw, 320px);
  display: flex;
  flex-direction: column;
  background: var(--green-deep);
  border-left: 1px solid var(--rule-strong);
  padding: 24px 0 28px;
  overflow-y: auto;
  overscroll-behavior: contain;
  z-index: 80;
  visibility: hidden;
  transform: translateX(101%);
  transition: transform 280ms var(--ease), visibility 0s linear 280ms;
}

.rail[data-open] {
  visibility: visible;
  transform: translateX(0);
  transition: transform 280ms var(--ease), visibility 0s linear 0s;
}

.rail__caption {
  padding: 0 20px 16px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--rock);
  text-transform: uppercase;
}

.rail__list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--rule);
}

.rail__item { border-bottom: 1px solid var(--rule); }

.rail__link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  color: var(--warm);
  opacity: .86;
  transition: opacity 200ms var(--ease), background-color 200ms var(--ease);
}

.rail__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 0;
  height: 100%;
  background: var(--lime);
  transition: width 240ms var(--ease);
}

.rail__link:hover,
.rail__link:focus-visible {
  opacity: 1;
  background: var(--wash);
}

.rail__link[aria-current="page"] {
  opacity: 1;
  background: var(--glass);
}

.rail__link[aria-current="page"]::before { width: 4px; }

.rail__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--rock);
  font-variant-numeric: tabular-nums;
}

.rail__link[aria-current="page"] .rail__idx { color: var(--lime); }

.rail__label {
  font-size: 16px;
  letter-spacing: .06em;
  line-height: 1.2;
}

.rail__actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: auto;
  padding: 24px 20px 0;
  border-top: 1px solid var(--rule);
}

.rail__scrim {
  position: fixed;
  inset: 0;
  z-index: 75;
  background: rgba(11, 43, 34, .78);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 240ms var(--ease), visibility 0s linear 240ms;
}

.rail[data-open] ~ .rail__scrim {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: opacity 240ms var(--ease), visibility 0s linear 0s;
}

html.is-nav-open { overflow: hidden; }

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 96px;
  background: var(--ink);
  color: var(--warm);
  border-top: 1px solid var(--rule);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 140px;
  height: 3px;
  background: var(--lime);
}

.footer__inner {
  max-width: var(--content);
  margin-inline: auto;
  padding: 56px 20px 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px 32px;
}

.footer__brand { min-width: 0; }

.footer__wordmark {
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 500;
  letter-spacing: -.02em;
  line-height: 1.15;
}

.footer__tagline {
  margin-top: 8px;
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--rock);
}

.footer__cta { margin-top: 22px; }

.footer__title {
  margin-bottom: 16px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .2em;
  color: var(--lime);
  text-transform: uppercase;
}

.footer__list { display: flex; flex-direction: column; }

.footer__link {
  display: inline-block;
  padding: 6px 0;
  font-size: 15px;
  color: var(--warm);
  opacity: .8;
  transition: opacity 160ms var(--ease), color 160ms var(--ease);
}

.footer__link:hover,
.footer__link:focus-visible { opacity: 1; color: var(--lime); }

.footer__meta {
  grid-column: 1 / -1;
  padding-top: 28px;
  border-top: 1px solid var(--rule);
  display: grid;
  gap: 8px;
}

.footer__contact {
  font-size: 14px;
  color: var(--warm);
  opacity: .82;
}

.footer__strong {
  font-family: var(--font-mono);
  letter-spacing: -.01em;
  color: var(--lime);
  opacity: 1;
}

.footer__address {
  font-size: 14px;
  color: var(--rock);
}

.footer__note {
  font-size: 13px;
  line-height: 1.7;
  color: var(--rock);
}

.footer__base {
  max-width: var(--content);
  margin: 32px auto 0;
  padding: 18px 20px 32px;
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--rock);
}

/* ---------- 8. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 20px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .06em;
  line-height: 1;
  color: var(--warm);
  background: transparent;
  border: 1px solid transparent;
  border-radius: 0;
  cursor: pointer;
  transition: background-color 180ms var(--ease), color 180ms var(--ease), border-color 180ms var(--ease);
}

.btn--lime {
  background: var(--lime);
  color: var(--ink);
  border-color: var(--lime);
}

.btn--lime:hover,
.btn--lime:focus-visible { background: var(--warm); border-color: var(--warm); }

.btn--ghost {
  color: var(--warm);
  border-color: var(--rule-strong);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: var(--wash);
  border-color: var(--lime);
  color: var(--lime);
}

/* ---------- 9. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--rock);
}

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

.breadcrumb li + li::before {
  content: "/";
  color: var(--rule-strong);
}

.breadcrumb a:hover,
.breadcrumb a:focus-visible { color: var(--lime); }

/* ---------- 10. 容器与网格 ---------- */
.container {
  width: 100%;
  max-width: var(--content);
  margin-inline: auto;
  padding-inline: 20px;
}

.section { padding-block: 56px; }

.grid { display: grid; gap: 16px; }

.grid--8 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

/* ---------- 11. 基础组件 ---------- */
.eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--rock);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  flex: 0 0 auto;
  width: 24px;
  height: 2px;
  background: var(--lime);
}

.numeral {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-size: 12px;
  letter-spacing: .08em;
  line-height: 1.6;
  color: var(--warm);
  border: 1px solid var(--rule-strong);
  background: var(--wash);
}

.tag--lime { border-color: var(--lime); color: var(--lime); background: transparent; }
.tag--clay { border-color: var(--clay); color: var(--clay); background: transparent; }
.tag--moss { border-color: var(--moss); background: var(--moss); color: var(--warm); }

.panel {
  padding: 24px;
  background: var(--green-mid);
  border: 1px solid var(--rule);
}

.panel--sand {
  background: var(--sand);
  color: var(--ink);
  border-color: var(--rule-dark);
}

.panel--paper {
  background: var(--warm);
  color: var(--ink);
  border: 1px solid var(--ink);
  box-shadow: 6px 6px 0 rgba(20, 22, 26, .55);
}

.data-bar {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  border-top: 1px solid var(--rule);
}

.data-bar__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 42px);
  font-weight: 600;
  letter-spacing: -.03em;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.data-bar__label {
  font-size: 14px;
  color: var(--warm);
  opacity: .84;
}

.data-bar__link {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--lime);
  white-space: nowrap;
  border-bottom: 1px solid transparent;
  transition: border-color 160ms var(--ease);
}

.data-bar__link:hover,
.data-bar__link:focus-visible { border-bottom-color: var(--lime); }

.prose { max-width: 38em; }
.prose p + p { margin-top: 1em; }
.prose h2 { margin-top: 1.8em; margin-bottom: .5em; }
.prose h3 { margin-top: 1.4em; margin-bottom: .4em; }
.prose ul { margin-top: 1em; display: grid; gap: 8px; }
.prose li {
  position: relative;
  padding-left: 20px;
  max-width: 38em;
}
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .75em;
  width: 8px;
  height: 2px;
  background: var(--lime);
}

/* ---------- 12. 图片容器 ---------- */
.media {
  position: relative;
  width: 100%;
  overflow: hidden;
  background: var(--green-mid);
  border: 1px solid var(--rule);
}

.media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.92) contrast(1.06) brightness(.92);
}

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }

.media--crop-offset .media__img { object-position: 72% 28%; }
.media--crop-low .media__img { object-position: 50% 78%; }

/* ---------- 13. 动效协议 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 520ms var(--ease), transform 520ms var(--ease);
}

[data-reveal].is-in {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 14. 断点：平板 ---------- */
@media (min-width: 700px) {
  .brand__tagline { display: block; }
  .topbar__switch { display: inline-flex; }
  .topbar { padding-inline: 24px; }
  .container { padding-inline: 32px; }
  .section { padding-block: 72px; }
  .grid { gap: 24px; }
  .footer__inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__brand { grid-column: 1 / -1; }
  .footer__inner { padding-inline: 32px; }
  .footer__base { padding-inline: 32px; }
}

/* ---------- 15. 断点：桌面（轨道导航） ---------- */
@media (min-width: 900px) {
  body { padding-left: var(--rail-w); }

  .skip-link { left: calc(var(--rail-w) + 12px); }

  .rail {
    inset: 0 auto 0 0;
    width: var(--rail-w);
    border-left: 0;
    border-right: 1px solid var(--rule);
    padding: 28px 0 16px;
    visibility: visible;
    transform: none;
    transition: none;
    z-index: 70;
  }

  .rail__caption { display: none; }

  .rail__list { flex: 1 1 auto; }

  .rail__item { border-bottom: 1px solid var(--rule); }

  .rail__link {
    flex-direction: column;
    justify-content: center;
    gap: 8px;
    min-height: 86px;
    padding: 12px 4px;
    opacity: .58;
  }

  .rail__link::before {
    left: 0;
    top: 50%;
    width: 4px;
    height: 0;
    transform: translateY(-50%);
    transition: height 240ms var(--ease);
  }

  .rail__link[aria-current="page"]::before {
    width: 4px;
    height: 40px;
  }

  .rail__idx { display: none; }

  .rail__label {
    writing-mode: vertical-rl;
    font-size: 14px;
    letter-spacing: .2em;
    line-height: 1;
    white-space: nowrap;
  }

  .rail__actions { display: none; }
  .rail__scrim { display: none; }

  .container { padding-inline: 40px; }
  .section { padding-block: 96px; }
  .grid--8 { grid-template-columns: repeat(8, minmax(0, 1fr)); gap: 24px; }
}

/* ---------- 16. 断点：宽屏页脚 ---------- */
@media (min-width: 1000px) {
  .footer__inner {
    grid-template-columns: 1.5fr 1fr 1fr;
    padding-inline: 40px;
    gap: 48px 40px;
  }
  .footer__brand { grid-column: auto; }
  .footer__base { padding-inline: 40px; }
}

/* ---------- 17. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0ms !important;
  }

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

  .rail {
    transition: none;
  }
}