/* ==========================================================================
   必赢体育 · 全站共享样式
   File: /assets/site.css
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root {
  --c-navy: #0A2440;
  --c-gold: #D4AF37;
  --c-cream: #F4EDE3;
  --c-ink: #261A12;
  --c-flame: #E85D3D;
  --c-slate: #5B7B9C;
  --c-gold-soft: #E3C26F;
  --c-moon: #F8FAFC;
  --c-ink-blue: #061323;
  --c-mist: #4A5468;

  --font-heading: "Roboto Condensed", "Noto Sans SC", "PingFang SC", sans-serif;
  --font-body: "Source Serif", "Noto Serif SC", "Songti SC", serif;
  --font-data: "Roboto Mono", "SFMono-Regular", Consolas, monospace;

  --content-width: 1180px;
  --transition-fast: 180ms;
  --transition-base: 240ms;
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--c-moon);
  color: var(--c-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  isolation: isolate;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, #F8FAFC 0%, #F4EDE3 56%, #F8FAFC 100%);
  pointer-events: none;
}

img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4, p, figure, ul, ol, dl, dd { margin: 0; }
ul, ol { padding: 0; }
a { color: inherit; }
button { font: inherit; cursor: pointer; }
main { display: block; }

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

::selection {
  background: var(--c-gold);
  color: var(--c-navy);
}

/* ---------- 3. 章节与正文排版 ---------- */
.section-block { padding: 64px 0; }
.section-block-muted { background: var(--c-cream); }

.content-width {
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: 20px;
}

.section-index {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-slate);
}
.section-index::before {
  content: "";
  width: 30px;
  height: 2px;
  background: var(--c-gold);
}

.section-kicker {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-flame);
  margin: 10px 0 4px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--c-navy);
  margin: 0 0 16px;
}

.section-description {
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-mist);
  max-width: 46em;
  margin: 0 0 28px;
}

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(180deg, #DDBE56 0%, #C9A227 100%);
  color: var(--c-navy);
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1;
  padding: 12px 20px;
  text-decoration: none;
  border: 1px solid var(--c-gold);
  position: relative;
  transition: transform var(--transition-fast) ease, box-shadow var(--transition-fast) ease;
}
.btn::before {
  content: "";
  position: absolute;
  left: -7px;
  bottom: -7px;
  width: 100%;
  height: 100%;
  border: 1px solid var(--c-navy);
  opacity: 0.55;
  pointer-events: none;
}
.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 5px 5px 0 rgba(10, 36, 64, 0.14);
}

.btn-outline {
  background: transparent;
  color: var(--c-gold);
  border-color: rgba(212, 175, 55, 0.8);
}
.btn-outline::before { border-color: rgba(212, 175, 55, 0.4); }
.btn-outline:hover {
  background: var(--c-gold);
  color: var(--c-navy);
  box-shadow: 5px 5px 0 rgba(212, 175, 55, 0.25);
}

@media (max-width: 640px) {
  .btn::before { display: none; }
  .btn:hover { transform: none; box-shadow: none; }
}

/* ---------- 5. 页头 ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 8px;
  z-index: 2100;
  background: var(--c-gold);
  color: var(--c-navy);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 14px;
  padding: 10px 18px;
  text-decoration: none;
}
.skip-link:focus { left: 8px; }

.reading-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 1100;
  background: rgba(248, 250, 252, 0.12);
  pointer-events: none;
}
.reading-progress[hidden] { display: none; }
.reading-progress-line {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--c-gold) 0%, var(--c-flame) 100%);
  box-shadow: 0 0 8px rgba(212, 175, 55, 0.55);
  transition: width 80ms linear;
}

.site-header {
  position: relative;
  z-index: 100;
  background: var(--c-navy);
  color: var(--c-moon);
}

.header-strip {
  height: 8px;
  background-color: var(--c-ink-blue);
  background-image: repeating-linear-gradient(90deg, rgba(212, 175, 55, 0.85) 0 1px, transparent 1px 14px);
}

.header-top { background: linear-gradient(180deg, #0C2D50 0%, #081E38 100%); }

.header-bottom {
  background: #081B31;
  border-top: 1px solid rgba(212, 175, 55, 0.45);
}

.header-frame {
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: 20px;
  display: flex;
  align-items: center;
}

.header-top .header-frame {
  min-height: 66px;
  justify-content: space-between;
  gap: 16px;
}

.header-frame-nav { min-height: 50px; flex-wrap: wrap; }

.brand {
  display: inline-flex;
  flex-direction: column;
  gap: 1px;
  text-decoration: none;
  color: var(--c-moon);
  position: relative;
  padding-left: 22px;
  line-height: 1.1;
}
.brand::before {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  width: 12px;
  height: 12px;
  background: linear-gradient(135deg, var(--c-gold) 50%, transparent 50%);
}
.brand-mark {
  font-family: var(--font-heading);
  font-size: 23px;
  font-weight: 700;
  letter-spacing: 0.06em;
}
.brand-mark-en {
  display: inline-block;
  margin-left: 4px;
  padding: 1px 5px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--c-navy);
  background: var(--c-gold);
  transform: translateY(-2px);
  vertical-align: middle;
}
.brand-caption {
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--c-slate);
}

.header-aux {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  border: 1px solid rgba(212, 175, 55, 0.75);
  color: var(--c-gold);
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 8px 14px;
  text-decoration: none;
  position: relative;
  transition: background var(--transition-fast) ease, color var(--transition-fast) ease;
}
.header-aux::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 9px;
  height: 9px;
  background: var(--c-flame);
  clip-path: polygon(0 0, 0 100%, 100% 100%);
}
.header-aux:hover { background: var(--c-gold); color: var(--c-navy); }
.header-aux-icon {
  display: inline-block;
  width: 10px;
  height: 10px;
  background: currentColor;
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
  flex: none;
}

.nav-main {
  display: flex;
  align-items: stretch;
  flex: 1;
}

.nav-list {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-item { position: relative; }
.nav-item + .nav-item { border-left: 1px solid rgba(212, 175, 55, 0.3); }

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 14px 16px;
  color: var(--c-moon);
  text-decoration: none;
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.12em;
  position: relative;
  transition: color var(--transition-fast) ease;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 10px;
  height: 2px;
  background: var(--c-gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--transition-base) ease;
}
.nav-link:hover,
.nav-link[aria-current="page"] { color: var(--c-gold); }
.nav-link:hover::after,
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.nav-coordinate {
  margin-left: auto;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-left: 16px;
  border-left: 1px solid rgba(212, 175, 55, 0.3);
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.07em;
  color: var(--c-slate);
  white-space: nowrap;
}
.nav-coordinate::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--c-gold);
  transform: rotate(45deg);
}

.nav-toggle { display: none; }

@media (max-width: 900px) {
  .nav-link { font-size: 14px; padding: 14px 12px; }
  .nav-coordinate { display: none; }
}

@media (max-width: 640px) {
  .header-strip { height: 6px; }
  .header-top .header-frame { min-height: 54px; }
  .brand { padding-left: 18px; }
  .brand-mark { font-size: 19px; }
  .brand-mark-en { font-size: 10px; }
  .brand-caption { display: none; }
  .header-aux { font-size: 12px; padding: 7px 10px; }

  .header-frame-nav { min-height: 52px; align-items: center; }

  .nav-main {
    flex: 0 0 100%;
    order: 2;
    max-height: 0;
    overflow: hidden;
    transition: max-height 260ms ease;
  }
  .nav-main[data-open="true"] {
    max-height: 380px;
    border-top: 1px solid rgba(212, 175, 55, 0.25);
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    padding: 6px 0 12px;
  }
  .nav-item + .nav-item {
    border-left: 0;
    border-top: 1px solid rgba(248, 250, 252, 0.07);
  }
  .nav-link {
    padding: 13px 4px;
    font-size: 15px;
    width: 100%;
  }
  .nav-link::after {
    left: 4px;
    bottom: 5px;
    right: auto;
    width: 26px;
  }

  .nav-toggle {
    order: 1;
    display: inline-flex;
    align-items: center;
    gap: 9px;
    margin-left: auto;
    background: transparent;
    border: 1px solid rgba(212, 175, 55, 0.75);
    color: var(--c-gold);
    font-family: var(--font-heading);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.1em;
    padding: 9px 12px;
  }
  .nav-toggle-bar {
    position: relative;
    width: 16px;
    height: 2px;
    background: currentColor;
    transition: background 120ms ease;
  }
  .nav-toggle-bar::before,
  .nav-toggle-bar::after {
    content: "";
    position: absolute;
    left: 0;
    width: 16px;
    height: 2px;
    background: currentColor;
    transition: transform var(--transition-fast) ease, top var(--transition-fast) ease;
  }
  .nav-toggle-bar::before { top: -5px; }
  .nav-toggle-bar::after { top: 5px; }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar { background: transparent; }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar::before { top: 0; transform: rotate(45deg); }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar::after { top: 0; transform: rotate(-45deg); }
}

/* ---------- 6. 页脚 ---------- */
.footer {
  background: var(--c-ink-blue);
  color: var(--c-moon);
}

.footer-strip {
  height: 6px;
  background: linear-gradient(90deg, var(--c-navy) 0%, var(--c-gold) 40%, var(--c-flame) 100%);
}

.footer-frame {
  max-width: var(--content-width);
  margin-inline: auto;
  padding: 52px 20px 30px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: 36px;
}

.footer-block {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}
.footer-block-major { gap: 10px; }

.footer-brand {
  font-family: var(--font-heading);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.2;
  color: var(--c-moon);
  margin: 0 0 6px;
}
.footer-brand-en {
  font-size: 14px;
  color: var(--c-gold);
  letter-spacing: 0.16em;
  margin-left: 6px;
}

.footer-claim {
  font-size: 13px;
  line-height: 1.85;
  color: rgba(248, 250, 252, 0.72);
  max-width: 36em;
  margin: 0;
}

.footer-data {
  font-family: var(--font-data);
  font-size: 12px;
  color: rgba(248, 250, 252, 0.55);
  margin: 8px 0 0;
}
.footer-data-figure {
  color: var(--c-gold);
  font-size: 17px;
  font-weight: 700;
}

.footer-heading {
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-gold);
  padding-bottom: 8px;
  margin-bottom: 10px;
  border-bottom: 1px solid rgba(212, 175, 55, 0.3);
  align-self: stretch;
}

.footer-link {
  position: relative;
  color: rgba(248, 250, 252, 0.82);
  font-size: 14px;
  line-height: 1.6;
  text-decoration: none;
  padding: 2px 0;
}
.footer-link::before {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 1px;
  background: var(--c-gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--transition-fast) ease;
}
.footer-link:hover { color: var(--c-gold); }
.footer-link:hover::before { transform: scaleX(1); }

.footer-text {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(248, 250, 252, 0.65);
}

.footer-rule {
  height: 1px;
  border: 0;
  margin: 36px 0 22px;
  background: linear-gradient(90deg, rgba(212, 175, 55, 0.1), var(--c-gold) 45%, rgba(212, 175, 55, 0.1));
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.footer-legal,
.footer-icp {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  color: rgba(248, 250, 252, 0.5);
}

@media (max-width: 960px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 640px) {
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .footer-frame { padding: 40px 20px 24px; }
}

/* ---------- 7. 通用组件 ---------- */
.grid-tracks,
.grid-tracks-2,
.grid-tracks-3,
.grid-tracks-asym {
  display: grid;
  gap: 26px;
}
.grid-tracks-2 { grid-template-columns: repeat(2, 1fr); }
.grid-tracks-3 { grid-template-columns: repeat(3, 1fr); }
.grid-tracks-asym { grid-template-columns: 1.5fr 1fr; }

@media (max-width: 960px) {
  .grid-tracks-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-tracks-asym { grid-template-columns: 1fr; }
}
@media (max-width: 700px) {
  .grid-tracks-2,
  .grid-tracks-3 { grid-template-columns: 1fr; }
}

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid rgba(10, 36, 64, 0.12);
  background: var(--c-moon);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  font-family: var(--font-heading);
  font-size: 13px;
  letter-spacing: 0.04em;
}
.breadcrumb li { display: inline-flex; align-items: center; }
.breadcrumb li + li::before {
  content: "/";
  color: var(--c-gold);
  margin-right: 8px;
}
.breadcrumb a { color: var(--c-slate); text-decoration: none; }
.breadcrumb a:hover,
.breadcrumb [aria-current="page"] { color: var(--c-ink); }

.frame-well {
  position: relative;
  background: var(--c-moon);
  border: 2px solid var(--c-navy);
  box-shadow: 7px 7px 0 rgba(10, 36, 64, 0.1);
  padding: 28px;
}
.frame-well::before {
  content: attr(data-index);
  position: absolute;
  top: -12px;
  left: 16px;
  background: var(--c-gold);
  color: var(--c-navy);
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 2px 10px;
}
.frame-well::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, transparent 49%, var(--c-navy) 50%);
}

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-family: var(--font-heading);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--c-mist);
}
.legend-item { display: inline-flex; align-items: center; gap: 8px; }
.legend-swatch {
  width: 12px;
  height: 12px;
  background: var(--c-navy);
  flex: none;
}
.legend-swatch-gold { background: var(--c-gold); }
.legend-swatch-flame { background: var(--c-flame); }
.legend-swatch-outline {
  background: var(--c-moon);
  border: 2px solid var(--c-navy);
  width: 10px;
  height: 10px;
}
.legend-swatch-line {
  background: repeating-linear-gradient(135deg, var(--c-slate) 0 2px, transparent 2px 5px);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(168px, 1fr));
  gap: 18px;
}
.metric-card {
  position: relative;
  background: var(--c-moon);
  border: 1px solid rgba(10, 36, 64, 0.14);
  border-top: 4px solid var(--c-gold);
  padding: 18px 20px 20px;
  transition: transform var(--transition-base) ease, box-shadow var(--transition-base) ease;
}
.metric-card:hover {
  transform: translate(0, -4px);
  box-shadow: 0 10px 24px rgba(10, 36, 64, 0.1);
}
.metric-label {
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-slate);
}
.metric-value {
  display: block;
  margin-top: 4px;
  font-family: var(--font-data);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-navy);
  line-height: 1.2;
}
.metric-unit {
  font-size: 13px;
  color: var(--c-slate);
  margin-left: 3px;
}
.metric-tag {
  position: absolute;
  top: 0;
  right: 0;
  background: var(--c-navy);
  color: var(--c-gold);
  font-family: var(--font-data);
  font-size: 10px;
  letter-spacing: 0.06em;
  padding: 3px 7px;
}

.data-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 15px;
}
.data-table th {
  background: var(--c-navy);
  color: var(--c-gold);
  font-family: var(--font-heading);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-align: left;
  padding: 10px 14px;
  white-space: nowrap;
}
.data-table td {
  padding: 10px 14px;
  border-bottom: 1px solid rgba(10, 36, 64, 0.12);
}
.data-table tbody tr:nth-child(even) { background: rgba(244, 237, 227, 0.4); }
.data-number {
  font-family: var(--font-data);
  font-variant-numeric: tabular-nums;
}

.media-frame {
  position: relative;
  overflow: hidden;
  background: var(--c-navy);
  aspect-ratio: 4 / 3;
}
.media-frame::before {
  content: attr(data-caption);
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 7px 12px;
  background: rgba(6, 19, 35, 0.76);
  color: var(--c-moon);
  font-family: var(--font-heading);
  font-size: 12px;
  letter-spacing: 0.05em;
}
.media-frame::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 46px;
  height: 46px;
  background: linear-gradient(225deg, var(--c-gold) 0 49%, transparent 50%);
  z-index: 1;
}
.media-frame img {
  position: relative;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame-wide { aspect-ratio: 16 / 9; }

.edge-shear { position: relative; }
.edge-shear::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 12px;
  background: linear-gradient(100deg, var(--c-gold) 0 60%, transparent 60.5%);
  pointer-events: none;
}

.shear-ticket {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--c-navy);
  color: var(--c-gold);
  font-family: var(--font-heading);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 10px 16px 10px 18px;
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 50%, calc(100% - 16px) 100%, 0 100%, 8px 50%);
}

.callout {
  background: var(--c-navy);
  color: var(--c-moon);
  border-left: 4px solid var(--c-gold);
  padding: 22px 24px;
}
.callout p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(248, 250, 252, 0.85);
}

.coordinate-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.coordinate-list li {
  position: relative;
  padding: 11px 0 11px 24px;
  border-bottom: 1px solid rgba(10, 36, 64, 0.1);
  font-size: 15px;
}
.coordinate-list li::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 17px;
  width: 8px;
  height: 8px;
  border: 2px solid var(--c-gold);
  transform: rotate(45deg);
}

/* ---------- 8. 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reading-progress-line { transition: none; }
}