/* =========================================================
   四季体育CN — /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   ========================================================= */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, figure, blockquote, dl, dd, ol, ul { margin: 0; }
ol, ul { padding: 0; }
img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }

/* ---------- 变量 ---------- */
:root {
  --ink: #0B2E24;
  --ink-2: #123B2F;
  --ink-3: #0A241C;
  --copper: #C9854A;
  --spring: #5FA85E;
  --bud: #E7C65A;
  --summer: #0E1C3A;
  --cyan: #2FD3C8;
  --autumn: #D9772F;
  --brick: #A8442B;
  --winter: #DCE3E8;
  --snow: #F7FAFB;
  --rock: #5B625F;
  --bone: #F2EDE4;
  --clay: #B86A4B;

  --frame-w: 272px;
  --radius-organic: 22px 6px 22px 6px;
  --line: rgba(220, 227, 232, 0.14);
  --line-copper: rgba(201, 133, 74, 0.34);
  --muted: rgba(220, 227, 232, 0.62);
  --ease: cubic-bezier(0.22, 0.75, 0.24, 1);

  --font-serif: "Songti SC", "STSong", "Noto Serif SC", "SimSun", Georgia, serif;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Menlo", "Consolas", "Liberation Mono", monospace;
}

body {
  --accent: var(--copper);
  min-height: 100vh;
  padding-inline-start: var(--frame-w);
  background-color: var(--ink);
  background-image:
    radial-gradient(1200px 620px at 80% -10%, rgba(47, 211, 200, 0.09), transparent 62%),
    radial-gradient(900px 520px at 2% 104%, rgba(201, 133, 74, 0.10), transparent 60%);
  background-repeat: no-repeat;
  color: var(--snow);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
body[data-season="spring"] { --accent: var(--spring); }
body[data-season="summer"] { --accent: var(--cyan); }
body[data-season="autumn"] { --accent: var(--autumn); }
body[data-season="winter"] { --accent: var(--winter); }

body.nav-locked { overflow: hidden; }

#main-content { display: block; scroll-margin-block-start: 24px; outline: none; }

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

/* ---------- 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 50%;
  z-index: 300;
  padding: 10px 20px;
  border-radius: 999px;
  background: var(--copper);
  color: #12261E;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  transform: translate(-50%, -190%);
  transition: transform 0.22s var(--ease);
}
.skip-link:focus-visible { transform: translate(-50%, 0); }

/* ---------- 头部：框架式导航 ---------- */
.site-header {
  position: fixed;
  inset-block: 0;
  inset-inline-start: 0;
  z-index: 80;
  width: var(--frame-w);
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 24px 20px 22px;
  background-color: var(--ink-2);
  background-image:
    linear-gradient(180deg, rgba(201, 133, 74, 0.14), transparent 26%),
    linear-gradient(200deg, rgba(47, 211, 200, 0.07), transparent 46%);
  border-inline-end: 1px solid var(--line-copper);
  overflow: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--line-copper) transparent;
}
.site-header::after {
  content: "";
  position: absolute;
  inset-block: 0;
  inset-inline-end: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--spring) 0%, var(--cyan) 34%, var(--bud) 50%, var(--autumn) 72%, var(--winter) 100%);
  opacity: 0.75;
}

.frame-head {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--snow);
  text-decoration: none;
}
.brand-mark {
  position: relative;
  flex: none;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: conic-gradient(from 210deg, var(--spring), var(--cyan), var(--bud), var(--autumn), var(--winter), var(--spring));
  box-shadow: 0 0 0 1px var(--line-copper), 0 0 16px rgba(47, 211, 200, 0.22);
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 11px;
  border-radius: 50%;
  background: var(--ink-2);
}
.brand-lines { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.06em;
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 10px 3px 10px 3px;
  color: var(--winter);
  font-size: 14px;
  cursor: pointer;
}
.nav-toggle-bars { display: inline-flex; flex-direction: column; gap: 4px; width: 18px; }
.nav-toggle-bars i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.24s var(--ease), opacity 0.2s linear;
}
.nav-toggle-bars i:nth-child(2) { width: 70%; }
.nav-toggle-text { letter-spacing: 0.08em; }
.site-header[data-open] .nav-toggle-bars i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .nav-toggle-bars i:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle-bars i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.frame-panel {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  gap: 22px;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--line-copper) transparent;
}

.frame-rounds { flex: none; }
.frame-label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}
.rounds-track {
  display: flex;
  gap: 6px;
  padding-bottom: 6px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.rounds-track::-webkit-scrollbar { height: 0; }
.round-chip {
  flex: none;
  padding: 8px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--winter);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  line-height: 1;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.round-chip:hover { border-color: var(--accent); color: var(--snow); }
.round-chip[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: #10231B;
  font-weight: 700;
}

.frame-nav { flex: none; }
.nav-list {
  list-style: none;
  counter-reset: navc;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.nav-list li { counter-increment: navc; }
.nav-list a {
  position: relative;
  display: block;
  padding: 9px 12px 9px 42px;
  border-inline-start: 2px solid transparent;
  border-radius: 0 12px 12px 0;
  color: var(--winter);
  font-size: 15.5px;
  text-decoration: none;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.nav-list a::before {
  content: counter(navc, decimal-leading-zero);
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
  transition: color 0.18s var(--ease);
}
.nav-list a:hover { background: rgba(247, 250, 251, 0.06); color: var(--snow); }
.nav-list a:hover::before { color: var(--accent); }
.nav-list a[aria-current="page"] {
  background: linear-gradient(90deg, rgba(201, 133, 74, 0.26), rgba(201, 133, 74, 0.02));
  border-inline-start-color: var(--accent);
  color: var(--snow);
  font-weight: 600;
}
.nav-list a[aria-current="page"]::before { color: var(--accent); }

.frame-utility {
  flex: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}
.util-link,
.season-toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: 10px 3px 10px 3px;
  background: transparent;
  color: var(--winter);
  font-size: 14.5px;
  text-align: start;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), border-color 0.18s var(--ease), color 0.18s var(--ease);
}
.util-link::before {
  content: "";
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--rock);
  transition: background-color 0.18s var(--ease);
}
.util-link:hover { background: rgba(247, 250, 251, 0.06); border-color: var(--line); color: var(--snow); }
.util-link:hover::before { background: var(--accent); }
.season-toggle-dots { display: inline-flex; gap: 3px; flex: none; }
.season-toggle-dots i { display: block; width: 7px; height: 7px; border-radius: 50%; }
.season-toggle-dots i:nth-child(1) { background: var(--spring); }
.season-toggle-dots i:nth-child(2) { background: var(--cyan); }
.season-toggle-dots i:nth-child(3) { background: var(--autumn); }
.season-toggle-dots i:nth-child(4) { background: var(--winter); }
.season-toggle-text {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.season-toggle:hover { background: rgba(247, 250, 251, 0.06); border-color: var(--line); }
.season-toggle:hover .season-toggle-text { color: var(--accent); }

.frame-cta {
  flex: none;
  justify-content: center;
  width: 100%;
  margin-top: auto;
}

.frame-scrim { display: none; }

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-block-start: 96px;
  background-color: var(--ink-3);
  border-block-start: 1px solid var(--line-copper);
  color: var(--winter);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset-block-start: -1px;
  inset-inline: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--spring), var(--cyan), var(--bud), var(--autumn), var(--winter));
  opacity: 0.8;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1.2fr;
  gap: 36px;
  width: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding: clamp(40px, 6vw, 72px) clamp(20px, 4vw, 56px) 36px;
}
.footer-col { min-width: 0; }
.footer-brand-name {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--snow);
}
.footer-brand-line {
  margin-block-start: 10px;
  max-width: 34ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}
.footer-note {
  margin-block-start: 12px;
  max-width: 34ch;
  font-size: 13px;
  line-height: 1.75;
  color: var(--rock);
}
.footer-heading {
  margin-block-end: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}
.footer-nav { display: flex; flex-direction: column; gap: 9px; }
.footer-nav a {
  width: fit-content;
  font-size: 15px;
  color: var(--winter);
  text-decoration: none;
  border-block-end: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.footer-nav a:hover { color: var(--snow); border-block-end-color: var(--accent); }
.footer-contact p {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  margin-block-end: 10px;
  font-size: 14.5px;
}
.footer-contact-key {
  flex: none;
  min-width: 5.2em;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rock);
  padding-block-start: 2px;
}
.footer-contact-value { color: var(--snow); word-break: break-word; }
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  max-width: 1180px;
  margin-inline: auto;
  padding: 18px clamp(20px, 4vw, 56px) 34px;
  border-block-start: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
}
.footer-legal-line { margin: 0; }
.ipc { font-family: var(--font-mono); letter-spacing: 0.04em; }

/* ---------- 版式 ---------- */
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-block-end: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
}
.kicker::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
}
.title-serif {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: 0.02em;
}
.t-xl { font-size: clamp(34px, 5.4vw, 64px); }
.t-lg { font-size: clamp(26px, 3.6vw, 42px); }
.t-md { font-size: clamp(20px, 2.2vw, 27px); }
.lede {
  max-width: 62ch;
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.85;
  color: var(--winter);
}
.note {
  max-width: 60ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}
.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}
.rule {
  height: 1px;
  border: 0;
  margin-block: clamp(28px, 4vw, 48px);
  background: linear-gradient(90deg, var(--line-copper), transparent);
}

/* ---------- 容器与网格 ---------- */
.wrap {
  width: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 56px);
}
.wrap--narrow { max-width: 800px; }
.wrap--wide { max-width: 1380px; }
.section { position: relative; padding-block: clamp(48px, 7vw, 96px); }
.grid { display: grid; gap: clamp(16px, 2.4vw, 28px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

/* ---------- 卡片与标记 ---------- */
.panel {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  background-color: rgba(18, 59, 47, 0.72);
  border: 1px solid var(--line);
  border-radius: var(--radius-organic);
}
.panel--soft { background-color: rgba(242, 237, 228, 0.06); }
.panel--flag::after {
  content: "";
  position: absolute;
  inset-block-start: 16px;
  inset-inline-start: -1px;
  width: 3px;
  height: 34px;
  border-radius: 0 3px 3px 0;
  background: var(--accent);
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--line-copper);
  border-radius: 999px;
  background: rgba(231, 198, 90, 0.08);
  color: var(--bud);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
}
.tag--copper { color: var(--copper); background: rgba(201, 133, 74, 0.10); }
.tag--cyan { color: var(--cyan); border-color: rgba(47, 211, 200, 0.36); background: rgba(47, 211, 200, 0.08); }
.tag--brick { color: #E09579; border-color: rgba(168, 68, 43, 0.5); background: rgba(168, 68, 43, 0.14); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 4px 16px 4px 16px;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease), transform 0.18s var(--ease);
}
.btn--accent { background: var(--accent); color: #10231B; }
.btn--accent:hover { background: var(--clay); color: var(--snow); transform: translateY(-1px); }
.btn--ghost { background: transparent; border-color: var(--line-copper); color: var(--snow); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  font-size: 13px;
  color: var(--muted);
}
.breadcrumb li { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before { content: "/"; color: var(--rock); }
.breadcrumb a { color: var(--winter); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb [aria-current="page"] { color: var(--snow); }

/* ---------- 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(201, 133, 74, 0.24);
  border-radius: 18px 4px 18px 4px;
  background-color: var(--ink-2);
  background-image: linear-gradient(140deg, rgba(18, 59, 47, 0.9), rgba(14, 28, 58, 0.92));
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-caption {
  margin-block-start: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 数据表 ---------- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}
.data-table caption {
  padding-block-end: 12px;
  text-align: start;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--accent);
}
.data-table th,
.data-table td {
  padding: 11px 12px;
  border-block-end: 1px solid var(--line);
  text-align: start;
}
.data-table th {
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--winter);
}
.data-table td { color: var(--snow); }
.data-table .num { color: var(--cyan); }

/* ---------- 折叠面板 ---------- */
.accordion {
  margin-block-end: 10px;
  border: 1px solid var(--line);
  border-radius: 14px 4px 14px 4px;
  background-color: rgba(18, 59, 47, 0.6);
  overflow: hidden;
}
.accordion > summary {
  position: relative;
  padding: 15px 48px 15px 18px;
  color: var(--snow);
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}
.accordion > summary::-webkit-details-marker { display: none; }
.accordion > summary::after {
  content: "+";
  position: absolute;
  inset-inline-end: 18px;
  inset-block-start: 50%;
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid var(--line-copper);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1;
  transform: translateY(-50%);
  transition: transform 0.22s var(--ease);
}
.accordion[open] > summary::after { transform: translateY(-50%) rotate(45deg); }
.accordion-body {
  padding: 0 18px 18px;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--winter);
}

/* ---------- 渐显 ---------- */
.reveal { opacity: 1; transform: none; }
html.js .reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}
html.js .reveal.is-in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 1023px) {
  body { padding-inline-start: 0; padding-block-start: 68px; }

  .site-header {
    inset-block: 0 auto;
    inset-inline: 0;
    width: 100%;
    height: 68px;
    flex-direction: row;
    align-items: center;
    gap: 0;
    padding: 0 16px;
    border-inline-end: none;
    border-block-end: 1px solid var(--line-copper);
    overflow: visible;
  }
  .site-header::after {
    inset-block: auto 0;
    inset-inline: 0;
    width: auto;
    height: 3px;
    background: linear-gradient(90deg, var(--spring), var(--cyan), var(--bud), var(--autumn), var(--winter));
  }
  .frame-head { width: 100%; }
  .nav-toggle { display: inline-flex; }
  .brand-mark { width: 30px; height: 30px; }
  .brand-mark::after { inset: 9px; }
  .brand-name { font-size: 18px; }
  .brand-sub { display: none; }

  .frame-panel {
    position: fixed;
    inset-block: 68px 0;
    inset-inline-start: 0;
    z-index: 2;
    width: min(86vw, 340px);
    padding: 20px 18px 30px;
    background-color: var(--ink-2);
    background-image: linear-gradient(180deg, rgba(201, 133, 74, 0.12), transparent 30%);
    border-inline-end: 1px solid var(--line-copper);
    transform: translateX(-102%);
    visibility: hidden;
    transition: transform 0.32s var(--ease), visibility 0.32s linear;
  }
  .site-header[data-open] .frame-panel { transform: none; visibility: visible; }

  .frame-scrim {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 1;
    background: rgba(5, 17, 13, 0.62);
  }
  .frame-scrim[hidden] { display: none; }
}

@media (max-width: 900px) {
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  body { font-size: 16px; }
  .site-footer { margin-block-start: 64px; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; padding-block-end: 28px; }
  .grid--2,
  .grid--3 { grid-template-columns: 1fr; }
  .footer-contact-key { min-width: 100%; }
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  html.js .reveal { opacity: 1; transform: none; transition: none; }
  .frame-panel,
  .skip-link,
  .btn,
  .round-chip,
  .util-link,
  .season-toggle,
  .nav-list a,
  .nav-toggle-bars i,
  .accordion > summary::after { transition: none; }
}