/* ==========================================================================
   完美体育看台 — /assets/site.css
   共享外壳：重置 / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background-color: #05131F;
  background-image:
    linear-gradient(to right, rgba(28, 58, 74, 0.34) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(28, 58, 74, 0.34) 1px, transparent 1px);
  background-size: 56px 56px;
  background-attachment: fixed;
  color: #EAF4F6;
  font-family: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

button { font: inherit; color: inherit; }

ul,
ol { margin: 0; padding: 0; }

/* ---------- 2. 设计变量 ---------- */
:root {
  --c-abyss: #05131F;
  --c-archive: #0B2635;
  --c-glass: rgba(233, 246, 248, 0.08);
  --c-glass-strong: rgba(233, 246, 248, 0.14);
  --c-cyan: #3FE0C9;
  --c-cyan-soft: #8FF2E4;
  --c-orange: #FF9A3C;
  --c-red: #FF4757;
  --c-wine: #6B1B2E;
  --c-indigo: #241A5C;
  --c-text: #EAF4F6;
  --c-muted: #93AEBB;
  --c-line: #1C3A4A;
  --c-ink: #04131C;

  --font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", serif;
  --font-sans: "Inter", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-cond: "Archivo Narrow", "Noto Sans SC Condensed", "Inter", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --rail: 232px;
  --edge: 48px;
  --gutter: 24px;
  --radius: 2px;

  --ease: ease-out;
  --dur: 180ms;
}

@media (max-width: 1080px) {
  :root { --edge: 32px; --gutter: 20px; }
}

@media (max-width: 720px) {
  :root { --edge: 20px; }
}

/* ---------- 3. 中文排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.26;
  color: var(--c-text);
}

h1 { font-size: clamp(30px, 4.4vw, 56px); }
h2 { font-size: clamp(24px, 3vw, 38px); }
h3 { font-size: clamp(19px, 2.1vw, 26px); }
h4 { font-size: clamp(17px, 1.6vw, 20px); }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

strong, b { font-weight: 700; color: var(--c-text); }

a {
  color: var(--c-cyan);
  text-decoration: none;
  transition: color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}

a:hover { color: var(--c-cyan-soft); }

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

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

/* ---------- 4. 主体偏移（配合固定轨道） ---------- */
main {
  margin-left: var(--rail);
  scroll-margin-top: 24px;
}

.site-footer { margin-left: var(--rail); }

@media (max-width: 1080px) {
  main { margin-left: 0; padding-top: 64px; }
  .site-footer { margin-left: 0; }
}

/* ---------- 5. 头部：左侧档案轨道 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail);
  z-index: 80;
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding: 26px 18px 20px;
  background: var(--c-archive);
  border-right: 1px solid var(--c-line);
  overflow: hidden;
}

.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 120;
  transform: translate(-50%, -160%);
  padding: 11px 20px;
  background: var(--c-cyan);
  color: var(--c-ink);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  border-radius: 0 0 var(--radius) var(--radius);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translate(-50%, 0);
  color: var(--c-ink);
  outline-offset: 0;
}

/* 品牌块 */
.brand {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  color: var(--c-text);
  flex: 0 0 auto;
}

.brand:hover { color: var(--c-text); }

.brand-mark {
  flex: 0 0 auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 2px;
  width: 26px;
  height: 26px;
  margin-top: 3px;
}

.brand-mark i {
  display: block;
  background: var(--c-line);
}

.brand-mark i:first-child { background: var(--c-cyan); }
.brand-mark i:last-child { background: var(--c-orange); }

.brand-mark--sm { width: 20px; height: 20px; margin-top: 0; }

.brand-copy { display: block; min-width: 0; }

.brand-name {
  display: block;
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.35;
}

.brand-sub {
  display: block;
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.13em;
  color: var(--c-muted);
  white-space: nowrap;
}

/* 移动端开关 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 13px;
  background: var(--c-glass);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  color: var(--c-text);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

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

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 1.5px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), top var(--dur) var(--ease), bottom var(--dur) var(--ease);
}

.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { bottom: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { bottom: 4px; transform: rotate(-45deg); }

/* 轨道导航 */
.rail-nav {
  display: flex;
  flex-direction: column;
  gap: 18px;
  flex: 1 1 auto;
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--c-line) transparent;
}

.rail-title {
  margin: 0;
  padding-left: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.nav-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 10px 9px 12px;
  color: #BCD3DB;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}

.nav-list a:hover {
  color: var(--c-cyan-soft);
  border-left-color: var(--c-orange);
  background: var(--c-glass);
}

.nav-list a[aria-current="page"] {
  color: var(--c-cyan);
  border-left-color: var(--c-cyan);
  background: var(--c-glass-strong);
}

.nav-idx {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  font-variant-numeric: tabular-nums;
  color: var(--c-muted);
}

.nav-list a:hover .nav-idx { color: var(--c-orange); }
.nav-list a[aria-current="page"] .nav-idx { color: var(--c-orange); }

.nav-name { font-size: 14.5px; letter-spacing: 0.02em; }

/* 状态条 */
.rail-status {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 10px;
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
}

.status-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin: 0;
}

.status-key {
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--c-muted);
}

.status-val {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--c-orange);
  letter-spacing: 0.02em;
}

.status-stamp {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--c-muted);
}

.status-mono { color: var(--c-cyan); }

/* 当前解析读数 */
.rail-readout {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 10px 10px 12px;
  background: var(--c-glass);
  border-left: 2px solid var(--c-orange);
}

.readout-key {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.readout-val {
  font-size: 13px;
  line-height: 1.45;
  color: var(--c-text);
}

/* 轨道 CTA */
.rail-cta {
  display: block;
  padding: 12px 14px;
  text-align: center;
  background: var(--c-cyan);
  border: 1px solid var(--c-cyan);
  border-radius: var(--radius);
  color: var(--c-ink);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
  transition: background-color var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              color var(--dur) var(--ease);
}

.rail-cta:hover {
  background: var(--c-cyan-soft);
  border-color: var(--c-cyan-soft);
  color: var(--c-ink);
}

/* 次级链接 */
.rail-utility {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  margin-top: auto;
  padding: 14px 10px 0;
  border-top: 1px solid var(--c-line);
}

.rail-utility a {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--c-muted);
}

.rail-utility a:hover { color: var(--c-cyan); }

/* ---------- 6. 页脚 ---------- */
.site-footer {
  margin-top: 96px;
  padding: 60px 0 30px;
  background: var(--c-archive);
  border-top: 1px solid var(--c-line);
  color: var(--c-muted);
  font-size: 14px;
}

.footer-top,
.footer-contact,
.footer-legal,
.footer-update {
  max-width: calc(1180px + var(--edge) * 2);
  margin-inline: auto;
  padding-inline: var(--edge);
}

.footer-top {
  display: grid;
  grid-template-columns: 1.6fr repeat(4, minmax(0, 1fr));
  gap: 36px 28px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--c-line);
}

.footer-brand-name {
  margin: 12px 0 8px;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 600;
  color: var(--c-text);
  letter-spacing: 0.02em;
}

.footer-brand-desc {
  margin: 0;
  max-width: 34ch;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-muted);
}

.footer-col-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  line-height: 1.5;
}

.footer-col-title a { color: var(--c-cyan); }
.footer-col-title a:hover { color: var(--c-cyan-soft); }

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-col li {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--c-muted);
}

.footer-col li a { color: var(--c-muted); }
.footer-col li a:hover { color: var(--c-cyan); }

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 48px;
  padding-block: 28px;
  border-bottom: 1px solid var(--c-line);
}

.contact-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin: 0;
  min-width: 190px;
}

.contact-key {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-muted);
}

.contact-val {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--c-text);
}

.contact-note {
  flex: 1 1 100%;
  margin: 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--c-muted);
  border-left: 2px solid var(--c-orange);
  padding-left: 12px;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 26px;
  padding-block: 24px 0;
  font-size: 12.5px;
}

.legal-brand {
  margin: 0;
  color: var(--c-text);
}

.legal-icp {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-muted);
}

.legal-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-left: auto;
}

.legal-links a {
  color: var(--c-muted);
  font-size: 12.5px;
}

.legal-links a:hover { color: var(--c-cyan); }

.footer-update {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
  line-height: 1.7;
  color: var(--c-muted);
}

/* ---------- 7. 通用容器与网格 ---------- */
.wrap {
  width: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: var(--edge);
}

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

@media (min-width: 1081px) {
  .col-3 { grid-column: span 3; }
  .col-4 { grid-column: span 4; }
  .col-5 { grid-column: span 5; }
  .col-6 { grid-column: span 6; }
  .col-7 { grid-column: span 7; }
  .col-8 { grid-column: span 8; }
  .col-12 { grid-column: span 12; }
}

@media (max-width: 1080px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  .grid-12 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 8. 基础组件 ---------- */
.eyebrow,
.label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--c-muted);
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--c-line);
}

.breadcrumb a { color: var(--c-muted); }
.breadcrumb a:hover { color: var(--c-cyan); }
.breadcrumb [aria-current="page"] { color: var(--c-orange); }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  background: var(--c-glass);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  color: var(--c-text);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease),
              color var(--dur) var(--ease),
              background-color var(--dur) var(--ease);
}

.btn:hover {
  border-color: var(--c-cyan);
  color: var(--c-cyan);
  background: rgba(63, 224, 201, 0.08);
}

.btn--primary {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  color: var(--c-ink);
  font-weight: 700;
}

.btn--primary:hover {
  background: var(--c-cyan-soft);
  border-color: var(--c-cyan-soft);
  color: var(--c-ink);
}

.card {
  background: var(--c-archive);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 24px;
}

.card--glass {
  background: var(--c-glass);
  border-color: rgba(233, 246, 248, 0.16);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  color: var(--c-muted);
}

.databar {
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  background:
    linear-gradient(90deg, rgba(63, 224, 201, 0.06), transparent 42%),
    var(--c-archive);
  padding-block: 26px;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 44px);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--c-orange);
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-muted);
}

/* 图片容器基础规则 */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  background: linear-gradient(160deg, #0B2635, #05131F 72%);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(200deg, rgba(63, 224, 201, 0.12), transparent 48%);
}

.media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.media--wide { aspect-ratio: 21 / 9; }
.media--16-9 { aspect-ratio: 16 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }

.media--angle {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), 0 100%);
}

/* 展开折叠条目 */
[data-disclosure] {
  background: var(--c-archive);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

[data-disclosure] > summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--c-text);
  cursor: pointer;
  list-style: none;
}

[data-disclosure] > summary::-webkit-details-marker { display: none; }

[data-disclosure] > summary::after {
  content: "＋";
  color: var(--c-orange);
  font-family: var(--font-mono);
  flex: 0 0 auto;
}

[data-disclosure][open] > summary {
  color: var(--c-cyan-soft);
  border-bottom: 1px solid var(--c-line);
}

[data-disclosure][open] > summary::after {
  content: "－";
  color: var(--c-cyan);
}

.disclosure-body {
  padding: 16px 18px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--c-muted);
}

/* ---------- 9. 移动端抽屉 ---------- */
@media (max-width: 1080px) {
  .site-header {
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    width: auto;
    height: 64px;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 0 var(--edge);
    border-right: 0;
    border-bottom: 1px solid var(--c-line);
    overflow: visible;
  }

  .brand { align-items: center; gap: 10px; }
  .brand-mark { width: 22px; height: 22px; margin-top: 0; }
  .brand-sub { margin-top: 3px; font-size: 9.5px; letter-spacing: 0.1em; }

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

  .rail-nav {
    position: fixed;
    top: 64px;
    left: 0;
    bottom: 0;
    width: min(300px, 84vw);
    padding: 22px 18px 26px;
    background: var(--c-archive);
    border-right: 1px solid var(--c-line);
    z-index: 90;
    overflow-y: auto;
    transform: translateX(-102%);
    visibility: hidden;
    transition: transform 220ms var(--ease), visibility 220ms var(--ease);
  }

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

@media (max-width: 520px) {
  .brand-sub { display: none; }
  .nav-toggle-text { display: none; }
  .nav-toggle { padding: 10px 12px; }
}

@media (max-width: 1080px) {
  .footer-top { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
  .legal-links { margin-left: 0; flex-basis: 100%; }
}

@media (max-width: 560px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .footer-contact { gap: 16px 24px; }
  .contact-row { min-width: 100%; }
}

/* ---------- 10. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

  .rail-nav { transition: none; }
  .skip-link { transition: none; }
}