/* ============================================================
   OBO赛事 — /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   ============================================================ */

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

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

body {
  margin: 0;
  overflow-x: clip;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, p, figure, ul, ol { margin: 0; }
ul, ol { padding: 0; }
img, svg, video { max-width: 100%; }
button { font: inherit; color: inherit; }
a { color: inherit; }

/* ---------- 变量 ---------- */
:root {
  --ink: #0B3D2E;
  --ink-deep: #072A20;
  --ink-black: #041A14;
  --paper: #F7F3E9;
  --lime: #C6FF3D;
  --lime-deep: #8FCB14;
  --orange: #FF6B35;
  --moss: #1E5B47;
  --mist: #A8B5AE;
  --mint: #5BE7C4;

  --font-display: "Barlow Condensed", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-num: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --header-h: 64px;
  --shell: 1320px;
  --gutter: 24px;
  --radius: 2px;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --dur: 200ms;
}

/* ---------- 精密网格底纹 ---------- */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(247, 243, 233, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(247, 243, 233, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
}

/* ---------- 基础排版 ---------- */
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.06;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(44px, 8vw, 104px); }
h2 { font-size: clamp(28px, 4vw, 38px); }
h3 { font-size: 19px; letter-spacing: 0; }

p { margin: 0 0 1.2em; }

a { text-decoration-thickness: 1px; text-underline-offset: 3px; }

strong { color: var(--paper); font-weight: 600; }

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

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

#main-content {
  position: relative;
  z-index: 1;
}

/* ---------- 通用容器 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.shell--narrow { max-width: 820px; }

/* ---------- 跳过链接 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -96px;
  z-index: 240;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 20px;
  background: var(--lime);
  color: var(--ink-black);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: top var(--dur) var(--ease);
}

.skip-link:focus { top: 12px; }

/* ============================================================
   头部
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--ink-black);
  border-bottom: 1px solid var(--moss);
}

.header-shell {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.header-bar {
  position: relative;
  z-index: 97;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: var(--header-h);
  transition: min-height var(--dur) var(--ease);
}

.site-header.is-slim .header-bar { min-height: 44px; }

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--paper);
  flex: 0 0 auto;
}

.brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  background: var(--lime);
  color: var(--ink-black);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.04em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background var(--dur) var(--ease);
}

.brand:hover .brand-mark { background: var(--lime-deep); }

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.brand-domain {
  font-family: var(--font-num);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

/* 常驻胶囊 */
.quick-capsule {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 0 1 auto;
  min-width: 0;
}

.capsule-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--moss);
  border-radius: 999px;
  color: var(--paper);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.06em;
  white-space: nowrap;
  transition:
    background var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

.capsule-link:hover,
.capsule-link:focus-visible {
  border-color: var(--lime);
  color: var(--lime);
  background: rgba(198, 255, 61, 0.06);
}

.capsule-index {
  font-family: var(--font-num);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--lime);
}

/* 工具区 */
.header-tools {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.season-chip {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 12px;
  border-left: 2px solid var(--lime);
  background: var(--ink-deep);
}

.season-chip-label {
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.season-chip-value {
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 700;
  color: var(--lime);
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 0 14px;
  background: transparent;
  border: 1px solid var(--moss);
  border-radius: var(--radius);
  color: var(--paper);
  font-size: 12px;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 16px;
  height: 12px;
}

.nav-toggle-bars span {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:first-child { transform: translateY(2.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:last-child { transform: translateY(-2.5px) rotate(-45deg); }

/* 主导航索引带 */
.site-nav {
  position: relative;
  z-index: 96;
  border-top: 1px solid rgba(30, 91, 71, 0.65);
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
}

.nav-item { flex: 1 1 auto; }

.nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  padding: 0 18px;
  color: var(--mist);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.1em;
  white-space: nowrap;
  border-right: 1px solid rgba(30, 91, 71, 0.5);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: var(--lime);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--paper);
  background: rgba(30, 91, 71, 0.35);
}

.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }

.nav-link[aria-current="page"] {
  color: var(--ink-black);
  background: var(--lime);
  font-weight: 600;
}

.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--ink-black);
}

.nav-num {
  font-family: var(--font-num);
  font-size: 10px;
  letter-spacing: 0.08em;
  opacity: 0.75;
}

/* 抽屉遮罩 + 进度条 */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 95;
  background: rgba(4, 26, 20, 0.55);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur) var(--ease), visibility var(--dur) var(--ease);
}

.nav-scrim.is-on { opacity: 1; visibility: visible; }

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  z-index: 98;
  height: 2px;
  width: 0;
  background: var(--lime);
  box-shadow: 0 0 12px rgba(198, 255, 61, 0.6);
  pointer-events: none;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: 96px;
  background: var(--ink-black);
  border-top: 1px solid var(--moss);
}

.footer-shell {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 56px var(--gutter) 32px;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(220px, 1.3fr) repeat(3, minmax(130px, 1fr));
  gap: 40px 32px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(30, 91, 71, 0.7);
}

.footer-brand-name {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-top: 16px;
  color: var(--paper);
}

.footer-domain {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
  margin: 6px 0 0;
}

.footer-meta {
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  margin: 18px 0 0;
  max-width: 26ch;
}

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

.footer-col-title {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lime);
  margin-bottom: 16px;
}

.footer-links {
  list-style: none;
  display: grid;
  gap: 10px;
}

.footer-links a {
  color: var(--mist);
  text-decoration: none;
  font-size: 14px;
  transition: color var(--dur) var(--ease);
}

.footer-links a:hover,
.footer-links a:focus-visible { color: var(--paper); }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 28px;
  padding-top: 24px;
}

.footer-contact {
  flex: 1 1 320px;
  margin: 0;
  font-size: 13px;
  color: var(--mist);
}

.footer-legal,
.footer-icp {
  margin: 0;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.to-top {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 18px;
  background: transparent;
  border: 1px solid var(--moss);
  border-radius: var(--radius);
  color: var(--paper);
  font-size: 12px;
  letter-spacing: 0.12em;
  cursor: pointer;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  transition:
    opacity var(--dur) var(--ease),
    transform var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

.to-top::after {
  content: "↑";
  font-family: var(--font-num);
  font-size: 13px;
}

.to-top.is-on {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

.to-top:hover,
.to-top:focus-visible {
  border-color: var(--lime);
  color: var(--lime);
}

/* ============================================================
   通用组件
   ============================================================ */
.section { padding: 72px 0; }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 24px;
  padding-bottom: 18px;
  margin-bottom: 32px;
  border-bottom: 1px solid rgba(30, 91, 71, 0.75);
}

.section-title { font-size: clamp(26px, 3.4vw, 36px); font-weight: 500; }

.section-note {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
  margin: 0;
}

.index-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--lime);
}

.index-label::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--lime);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 24px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-decoration: none;
  cursor: pointer;
  transition:
    background var(--dur) var(--ease),
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

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

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

.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--moss);
}

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

/* 面包屑 */
.breadcrumb { padding: 24px 0 0; }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.breadcrumb-link {
  color: var(--mist);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

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

.breadcrumb-separator { color: var(--moss); }

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

/* 正文 */
.prose {
  max-width: 72ch;
  font-size: 17px;
  line-height: 1.8;
  color: rgba(247, 243, 233, 0.88);
}

.prose > *:last-child { margin-bottom: 0; }

.prose h2 {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 500;
  margin: 2em 0 0.6em;
  color: var(--paper);
}

.prose h3 {
  font-family: var(--font-body);
  font-size: 18px;
  font-weight: 600;
  margin: 1.8em 0 0.5em;
  color: var(--paper);
}

.prose a { color: var(--lime); }

.prose ul,
.prose ol { margin: 0 0 1.2em; padding-left: 1.2em; }

.prose li { margin-bottom: 0.4em; }

/* 网格与非对称分栏 */
.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)); }

.split {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
  gap: 40px;
  align-items: start;
}

/* 标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 26px;
  padding: 0 10px;
  border: 1px solid var(--moss);
  color: var(--mist);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tag--lime { border-color: var(--lime); color: var(--lime); }
.tag--orange { border-color: var(--orange); color: var(--orange); }

/* 图片容器 */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--ink-deep);
  border: 1px solid var(--moss);
}

.media-frame img,
.media-frame video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05) brightness(0.92);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: rgba(11, 61, 46, 0.12);
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }

.rule {
  height: 1px;
  border: 0;
  background: rgba(30, 91, 71, 0.75);
  margin: 0;
}

/* 滚动显现 */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
}

.js-reveal [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* 目录跟随 */
[data-toc-link][aria-current="true"] {
  color: var(--lime);
  border-color: var(--lime);
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1180px) {
  .brand-domain { display: none; }
  .capsule-link { padding: 0 13px; }
  .nav-link { padding: 0 14px; letter-spacing: 0.06em; }
}

@media (max-width: 1024px) {
  .split { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .footer-top { grid-template-columns: minmax(200px, 1.2fr) repeat(3, minmax(110px, 1fr)); }
}

@media (max-width: 900px) {
  :root { --header-h: 118px; --gutter: 20px; }

  .header-bar {
    flex-wrap: wrap;
    align-content: center;
    gap: 10px 12px;
    padding: 10px 0;
  }

  .brand { order: 1; }
  .header-tools { order: 2; margin-left: auto; }
  .nav-toggle { display: inline-flex; }

  .quick-capsule {
    order: 3;
    flex: 1 1 100%;
    overflow-x: auto;
    scrollbar-width: none;
    padding-bottom: 2px;
  }

  .quick-capsule::-webkit-scrollbar { display: none; }
  .capsule-link { flex: 0 0 auto; min-height: 44px; }

  .site-header.is-slim .header-bar { min-height: 0; }

  /* 抽屉 */
  .site-nav {
    position: fixed;
    top: var(--header-h);
    right: 0;
    bottom: 0;
    width: min(86vw, 360px);
    padding: 20px var(--gutter) 40px;
    background: var(--ink-black);
    border-top: 1px solid var(--moss);
    border-left: 1px solid var(--moss);
    overflow-y: auto;
    transform: translateX(100%);
    opacity: 0;
    visibility: hidden;
    transition:
      transform var(--dur) var(--ease),
      opacity var(--dur) var(--ease),
      visibility var(--dur) var(--ease);
  }

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

  .nav-list { flex-direction: column; }

  .nav-item { flex: 0 0 auto; }

  .nav-link {
    min-height: 56px;
    font-size: 15px;
    letter-spacing: 0.06em;
    border-right: 0;
    border-bottom: 1px solid rgba(30, 91, 71, 0.5);
  }

  .nav-num { opacity: 1; color: var(--lime); font-size: 11px; }

  body.nav-open { overflow: hidden; }

  .section { padding: 48px 0; }
  .site-footer { margin-top: 64px; }
  .footer-shell { padding: 40px var(--gutter) 28px; }
  .footer-top { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 24px; }
  .to-top { margin-left: 0; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .grid--2, .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .season-chip-label { display: none; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 10px; }
}

@media (max-width: 420px) {
  .brand-mark { width: 38px; height: 38px; font-size: 13px; }
  .brand-name { font-size: 17px; }
  .nav-toggle-label { display: none; }
}

/* ============================================================
   减弱动效
   ============================================================ */
@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;
  }

  .js-reveal [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .site-nav,
  .nav-scrim {
    transition-duration: 0.001ms !important;
  }
}