/* ============================================================
   欧亿体育 · 共享样式表 /assets/site.css
   暖纸底 · 墨黑字 · 节气色带驱动的外壳
   ============================================================ */

/* 1. 设计令牌 ------------------------------------------------ */
:root {
  --paper: #FBF6EC;
  --paper-raised: #F1E7D8;
  --ink: #15120E;
  --ink-soft: #4A4238;
  --ink-muted: #857A6B;
  --brand: #C4462B;
  --line: #E4D8C4;
  --line-strong: #D3C3A9;

  --spring: #7FAE4E;
  --spring-soft: #EF9AA6;
  --summer: #0E6B60;
  --summer-soft: #F07A18;
  --autumn: #B9861F;
  --autumn-soft: #9E3B22;
  --winter: #7FB8DA;
  --winter-soft: #B9C1C7;

  --card-yellow: #E8B20A;
  --card-red: #D5203A;

  --season: var(--brand);
  --season-soft: var(--autumn-soft);

  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 10px;
  --pill: 999px;

  --ease: cubic-bezier(.22, 1, .36, 1);
  --dur: 200ms;
  --dur-slow: 280ms;

  --wrap: 1200px;
  --gutter: clamp(18px, 4vw, 40px);
  --header-h: 74px;

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

/* 专题季主题：<body data-season="spring|summer|autumn|winter"> */
body[data-season="spring"] { --season: var(--spring); --season-soft: var(--spring-soft); }
body[data-season="summer"] { --season: var(--summer); --season-soft: var(--summer-soft); }
body[data-season="autumn"] { --season: var(--autumn); --season-soft: var(--autumn-soft); }
body[data-season="winter"] { --season: var(--winter); --season-soft: var(--winter-soft); }

/* 2. 重置与基础 ---------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 22px);
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
svg { display: block; }
ul, ol { margin: 0; padding: 0; list-style: none; }

[hidden] { display: none !important; }

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 2px;
  border-radius: 6px;
}

#main-content { display: block; }
#main-content:focus-visible { outline-offset: -2px; }

/* 3. 排版与文字建筑 ------------------------------------------ */
h1, h2, h3, h4 {
  margin: 0;
  font-weight: 800;
  letter-spacing: .03em;
  line-height: 1.32;
  color: var(--ink);
}

h1 { font-size: clamp(2.4rem, 7vw, 5.2rem); line-height: 1.06; letter-spacing: .02em; }
h2 { font-size: clamp(1.25rem, 2vw, 1.75rem); }
h3 { font-size: clamp(1.05rem, 1.4vw, 1.25rem); letter-spacing: .04em; }

p { margin: 0 0 1.2em; max-width: 38em; }
p:last-child { margin-bottom: 0; }

a { color: var(--ink); }
a:hover { color: var(--brand); }

.num,
time,
.data-table .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* 4. 通用容器与骨架 ------------------------------------------ */
.container {
  width: min(calc(100% - var(--gutter) * 2), var(--wrap));
  margin-inline: auto;
}

.section { padding-block: clamp(38px, 6vw, 84px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px;
  font-size: .875rem;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--ink-muted);
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 3px;
  border-radius: 2px;
  background: var(--season);
  transition: background-color var(--dur) var(--ease);
}

.section-title { font-size: clamp(1.25rem, 2vw, 1.75rem); margin: 0; }

.display-title {
  margin: 0;
  font-size: clamp(2.4rem, 7vw, 5.2rem);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: .02em;
}

.lede {
  margin: 0;
  max-width: 38em;
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  line-height: 1.85;
  color: var(--ink-soft);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2.4vw, 28px);
}

.grid-split {
  display: grid;
  grid-template-columns: minmax(0, 62fr) minmax(0, 38fr);
  gap: clamp(24px, 4vw, 56px);
  align-items: start;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: clamp(14px, 2vw, 22px);
}

.card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 3vw, 32px);
}

.card p { max-width: 34em; }

.prose { max-width: 68ch; }
.prose p { max-width: 38em; }
.prose h2 { margin-top: 2.4em; }
.prose h2:first-child { margin-top: 0; }
.prose ul { margin: 0 0 1.2em; padding-left: 1.2em; list-style: disc; }
.prose li { margin-bottom: .4em; max-width: 36em; }

/* 5. 按钮 ---------------------------------------------------- */
.btn {
  --btn-bg: var(--ink);
  --btn-fg: var(--paper);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border: 1px solid transparent;
  border-radius: var(--pill);
  background: var(--btn-bg);
  color: var(--btn-fg);
  font-family: inherit;
  font-size: .92rem;
  font-weight: 700;
  letter-spacing: .05em;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--dur) var(--ease),
              background-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.btn:hover { transform: translateY(-1px); }

.btn-primary { --btn-bg: var(--brand); --btn-fg: #FFFFFF; }
.btn-primary:hover { --btn-bg: #A93A22; }

.btn-ghost {
  --btn-bg: transparent;
  --btn-fg: var(--ink);
  border-color: var(--line-strong);
}
.btn-ghost:hover { --btn-bg: var(--paper-raised); }

/* 6. 页头 ---------------------------------------------------- */
.skip-link {
  position: fixed;
  top: -80px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 120;
  padding: 10px 22px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background: var(--ink);
  color: var(--paper);
  font-size: .9rem;
  font-weight: 700;
  letter-spacing: .06em;
  text-decoration: none;
  transition: top 180ms var(--ease);
}

.skip-link:focus { top: 0; color: var(--paper); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--paper);
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.site-header[data-stuck="true"] {
  border-bottom-color: var(--line);
  box-shadow: 0 16px 34px -30px rgba(21, 18, 14, .75);
}

.season-strip {
  height: 8px;
  width: 100%;
  background: var(--season);
  transition: background-color var(--dur-slow) var(--ease);
}

.header-shell {
  width: min(calc(100% - var(--gutter) * 2), var(--wrap));
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 11px 13px;
}

.brand-block { flex: 0 1 auto; min-width: 0; }

.brand {
  display: inline-flex;
  flex-direction: column;
  gap: 5px;
  text-decoration: none;
  color: inherit;
}

.brand-name {
  font-size: 1.06rem;
  font-weight: 800;
  letter-spacing: .1em;
  line-height: 1.1;
}

.brand-rule {
  display: block;
  width: 100%;
  height: 3px;
  border-radius: 2px;
  background: var(--season);
  transition: background-color var(--dur-slow) var(--ease);
}

.brand-tag {
  font-size: .8rem;
  letter-spacing: .16em;
  line-height: 1.2;
  color: var(--ink-soft);
}

.nav-capsule {
  display: flex;
  align-items: center;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: var(--paper-raised);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
}

.nav-link {
  position: relative;
  display: inline-block;
  padding: 8px 14px 10px;
  border-radius: var(--pill);
  color: var(--ink-soft);
  font-size: .92rem;
  font-weight: 500;
  letter-spacing: .04em;
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.nav-link:hover { color: var(--ink); background: var(--paper); }

.nav-link[aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
  background: var(--paper);
  box-shadow: inset 0 0 0 1px var(--line);
}

.nav-link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 4px;
  width: 5px;
  height: 5px;
  margin-left: -2.5px;
  border-radius: 50%;
  background: var(--brand);
}

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

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 10px 16px;
  border: 1px solid var(--line-strong);
  border-radius: var(--pill);
  background: var(--paper-raised);
  color: var(--ink);
  font-family: inherit;
  font-size: .9rem;
  font-weight: 700;
  letter-spacing: .08em;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.nav-toggle:hover { background: var(--paper); }
.nav-toggle[aria-expanded="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
}

.nav-toggle-bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:first-child { transform: translateY(3px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:last-child { transform: translateY(-3px) rotate(-45deg); }

.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}

.header-progress span {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: var(--season);
  opacity: .8;
}

/* 7. 目录遮罩与抽屉 ------------------------------------------ */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 70;
  background: rgba(21, 18, 14, .44);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur) var(--ease), visibility var(--dur) var(--ease);
}

.nav-scrim[data-open] { opacity: 1; visibility: visible; }

.nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 80;
  width: min(86vw, 360px);
  max-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: 22px var(--gutter) 26px;
  overflow-y: auto;
  overscroll-behavior: contain;
  background: var(--paper);
  border-left: 1px solid var(--line);
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  box-shadow: -30px 0 70px -48px rgba(21, 18, 14, .8);
  transform: translateX(102%);
  visibility: hidden;
  transition: transform var(--dur-slow) var(--ease), visibility var(--dur-slow) var(--ease);
}

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

.nav-drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line);
}

.nav-drawer-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: .12em;
}

.drawer-close {
  padding: 8px 15px;
  border: 1px solid var(--line-strong);
  border-radius: var(--pill);
  background: var(--paper-raised);
  color: var(--ink);
  font-family: inherit;
  font-size: .875rem;
  font-weight: 700;
  letter-spacing: .08em;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.drawer-close:hover { background: var(--ink); color: var(--paper); }

.nav-drawer-list {
  display: flex;
  flex-direction: column;
  margin-top: 16px;
}

.nav-drawer-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 13px 2px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: .04em;
  text-decoration: none;
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.nav-drawer-link::after {
  content: "→";
  font-size: .9rem;
  color: var(--ink-muted);
  transition: transform var(--dur) var(--ease);
}

.nav-drawer-link:hover { color: var(--brand); padding-left: 8px; }
.nav-drawer-link:hover::after { transform: translateX(3px); }

.nav-drawer-link[aria-current="page"] { color: var(--brand); }
.nav-drawer-link[aria-current="page"]::after { color: var(--brand); }

.nav-drawer-foot {
  margin-top: auto;
  padding-top: 22px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  border-top: 1px solid var(--line);
}

.nav-drawer-note {
  margin: 0;
  font-size: .875rem;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* 8. 页脚 ---------------------------------------------------- */
.site-footer {
  --f-ink: #FBF6EC;
  --f-soft: rgba(251, 246, 236, .72);
  --f-muted: rgba(251, 246, 236, .56);
  --f-line: rgba(251, 246, 236, .16);
  margin-top: clamp(56px, 9vw, 112px);
  padding-top: clamp(40px, 6vw, 72px);
  background: var(--ink);
  color: var(--f-ink);
  border-radius: clamp(28px, 5vw, 56px) clamp(28px, 5vw, 56px) 0 0;
  overflow: hidden;
}

.site-footer :focus-visible { outline-color: var(--paper); }

.footer-shell {
  width: min(calc(100% - var(--gutter) * 2), var(--wrap));
  margin-inline: auto;
  padding-bottom: clamp(26px, 4vw, 40px);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 56px);
}

.footer-brand-name {
  margin: 0;
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  font-weight: 800;
  letter-spacing: .12em;
  color: var(--f-ink);
}

.footer-brand-rule {
  display: block;
  width: 76px;
  height: 4px;
  margin: 14px 0 16px;
  border-radius: 2px;
  background: var(--season);
}

.footer-brand-note {
  margin: 0;
  max-width: 34ch;
  font-size: .95rem;
  line-height: 1.85;
  color: var(--f-soft);
}

.footer-col-title {
  margin: 4px 0 16px;
  font-size: .9rem;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--f-muted);
}

.footer-col-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col-list a {
  color: var(--f-soft);
  font-size: .95rem;
  letter-spacing: .04em;
  text-decoration: none;
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease);
}

.footer-col-list a:hover { color: var(--f-ink); padding-left: 5px; }

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 34px;
  margin-top: clamp(28px, 4vw, 46px);
  padding-top: clamp(20px, 3vw, 28px);
  border-top: 1px solid var(--f-line);
}

.footer-contact-item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  max-width: none;
  font-size: .95rem;
  color: var(--f-soft);
}

.footer-label {
  font-size: .85rem;
  letter-spacing: .16em;
  color: var(--f-muted);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: clamp(22px, 3vw, 32px);
  padding-top: 20px;
  border-top: 1px solid var(--f-line);
  font-size: .875rem;
  color: var(--f-muted);
}

.footer-bottom p { margin: 0; max-width: none; }
.footer-icp { letter-spacing: .06em; }

.footer-strip {
  height: 10px;
  background: linear-gradient(
    90deg,
    var(--spring) 0 25%,
    var(--summer) 25% 50%,
    var(--autumn) 50% 75%,
    var(--winter) 75% 100%
  );
}

/* 9. 内容组件 ------------------------------------------------ */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  margin: 0 0 18px;
  padding: 0;
  font-size: .875rem;
  color: var(--ink-muted);
}

.breadcrumbs li { display: inline-flex; align-items: center; }

.breadcrumbs li:not(:last-child)::after {
  content: "／";
  margin-inline: 8px;
  color: var(--ink-muted);
  opacity: .7;
}

.breadcrumbs a {
  color: var(--ink-soft);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.breadcrumbs a:hover { color: var(--brand); }
.breadcrumbs [aria-current="page"] { color: var(--ink); }

.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--paper-raised) radial-gradient(circle at 30% 20%, rgba(196, 70, 43, .1), transparent 60%);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--dur-slow) var(--ease);
}

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

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 13px;
  border: 1px solid var(--line-strong);
  border-radius: var(--pill);
  background: var(--paper-raised);
  color: var(--ink-soft);
  font-size: .875rem;
  font-weight: 700;
  letter-spacing: .06em;
  line-height: 1.7;
}

.tag--yellow {
  border-color: rgba(232, 178, 10, .5);
  background: rgba(232, 178, 10, .14);
  color: #7A5C00;
}

.tag--red {
  border-color: rgba(213, 32, 58, .42);
  background: rgba(213, 32, 58, .1);
  color: #A3152B;
}

.segmented {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: var(--paper-raised);
}

.segmented [role="tab"] {
  appearance: none;
  padding: 8px 18px;
  border: 0;
  border-radius: var(--pill);
  background: transparent;
  color: var(--ink-soft);
  font-family: inherit;
  font-size: .9rem;
  font-weight: 700;
  letter-spacing: .04em;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.segmented [role="tab"]:hover { background: var(--paper); color: var(--ink); }

.segmented [role="tab"][aria-selected="true"] {
  background: var(--ink);
  color: var(--paper);
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--paper-raised);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .95rem;
}

.data-table th {
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  font-size: .875rem;
  font-weight: 700;
  letter-spacing: .12em;
  color: var(--ink-muted);
  text-align: left;
  white-space: nowrap;
}

.data-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
}

.data-table tbody tr:last-child td { border-bottom: 0; }
.data-table .num { text-align: right; color: var(--ink); }

.seasonal-rail {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  padding-bottom: 12px;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}

.seasonal-rail > * {
  flex: 0 0 min(280px, 72vw);
  scroll-snap-align: start;
}

/* 10. 显现动效 ----------------------------------------------- */
.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* 11. 响应式 ------------------------------------------------- */
@media (max-width: 1040px) {
  .nav-link { padding-inline: 11px; font-size: .88rem; }
  .header-cta { padding-inline: 17px; }
}

@media (max-width: 920px) {
  :root { --header-h: 70px; }
  .nav-capsule { display: none; }
  .nav-toggle { display: inline-flex; }
  .grid-split { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 880px) {
  .footer-top { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 768px) {
  body { font-size: 15.5px; }
  .section { padding-block: clamp(30px, 7vw, 52px); }
  .card { border-radius: var(--radius-md); }
  .media-frame { border-radius: var(--radius-md); }
  .footer-contact { flex-direction: column; gap: 10px; }
}

@media (max-width: 620px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); gap: 30px; }
  .footer-bottom { flex-direction: column; gap: 6px; }
}

@media (max-width: 480px) {
  .header-cta { display: none; }
  .brand-tag { display: none; }
  .brand-rule { margin-top: 2px; }
}

/* 12. 动效降级 ----------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .js .reveal { opacity: 1; transform: none; }

  .nav-drawer,
  .nav-scrim {
    transition: none;
  }

  .btn:hover,
  .nav-drawer-link:hover,
  .footer-col-list a:hover {
    transform: none;
    padding-left: 0;
  }
}