/* =========================================================
   爱体育CN 共享外壳样式 / assets/site.css
   ========================================================= */

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

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

body,
h1, h2, h3, h4, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }

ul, ol { padding: 0; list-style: none; }

img, svg, video { display: block; max-width: 100%; }

button, input, select, textarea { font: inherit; color: inherit; }

a { color: inherit; text-decoration: none; }

table { border-collapse: collapse; }

/* ---------- variables ---------- */
:root {
  --paper: #F5F1E6;
  --paper-2: #E4DECD;
  --paper-3: #EFEAD9;
  --pitch: #0B2B24;
  --night: #0F1E38;
  --gold: #F0A03C;
  --gold-deep: #C9751A;
  --teal: #3FE0B4;
  --red: #D2442E;
  --ink: #14201C;
  --ink-soft: #4C5C55;
  --line: rgba(27, 42, 37, 0.2);
  --line-strong: rgba(27, 42, 37, 0.42);
  --on-dark: rgba(245, 241, 230, 0.78);
  --on-dark-soft: rgba(245, 241, 230, 0.52);

  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-num: "Barlow Condensed", "Oswald", "Roboto Condensed", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --maxw: 1360px;
  --gutter: clamp(16px, 4vw, 48px);
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --slant: 6deg;
}

/* ---------- base typography ---------- */
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

p { text-wrap: pretty; }

:focus-visible {
  outline: 2px solid var(--gold-deep);
  outline-offset: 3px;
  border-radius: 4px;
}

.site-footer :focus-visible,
.u-section--pitch :focus-visible { outline-color: var(--teal); }

/* ---------- utilities ---------- */
.u-container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.u-section { padding-block: clamp(56px, 9vw, 120px); }
.u-section--pitch { background: var(--pitch); color: var(--paper); }
.u-section--paper2 { background: var(--paper-2); }

.u-grid-bg {
  background-image:
    linear-gradient(rgba(27, 42, 37, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 42, 37, 0.06) 1px, transparent 1px);
  background-size: 56px 56px;
}

.u-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--gold-deep);
}

.u-eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: currentColor;
  transform: skewY(calc(var(--slant) * -1));
}

.u-section--pitch .u-eyebrow { color: var(--teal); }

.u-lead {
  font-size: clamp(17px, 2.1vw, 20px);
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 34em;
}

.u-section--pitch .u-lead { color: var(--on-dark); }

.u-num {
  font-family: var(--font-num);
  font-weight: 800;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  line-height: 0.9;
}

.u-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  color: var(--ink-soft);
}

.u-tag--gold { border-color: var(--gold); color: var(--gold-deep); }

.u-section--pitch .u-tag { border-color: rgba(245, 241, 230, 0.34); color: var(--on-dark); }

.u-rule {
  height: 1px;
  border: 0;
  background: var(--line);
}

.u-section--pitch .u-rule { background: rgba(245, 241, 230, 0.18); }

/* split skeleton : 63 / 37 */
.u-split {
  display: grid;
  gap: clamp(24px, 4vw, 56px);
  grid-template-columns: minmax(0, 1.72fr) minmax(0, 1fr);
  align-items: start;
}

.u-split--reverse { grid-template-columns: minmax(0, 1fr) minmax(0, 1.72fr); }

/* ---------- buttons ---------- */
.u-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

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

.u-btn--gold { background: var(--gold); color: #231402; }
.u-btn--gold:hover { background: var(--gold-deep); color: #fff; }

.u-btn--ghost { border-color: var(--line-strong); color: var(--ink); }
.u-btn--ghost:hover { background: var(--ink); border-color: var(--ink); color: var(--paper); }

.u-btn--paper { border-color: rgba(245, 241, 230, 0.42); color: var(--paper); }
.u-btn--paper:hover { background: var(--paper); border-color: var(--paper); color: var(--pitch); }

/* ---------- breadcrumb ---------- */
.breadcrumb {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

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

.breadcrumb a:hover { color: var(--gold-deep); }

.breadcrumb [aria-current="page"] { color: var(--ink); font-weight: 700; }

/* ---------- table base ---------- */
.u-table {
  width: 100%;
  font-size: 14px;
  line-height: 1.5;
}

.u-table caption {
  text-align: left;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  padding-bottom: 10px;
}

.u-table th,
.u-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: middle;
}

.u-table thead th {
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
  border-bottom: 1px solid var(--line-strong);
}

.u-table tbody tr:nth-child(even) { background: var(--paper-2); }

.u-table th.u-num,
.u-table td.u-num { text-align: right; }

.u-table .u-num { font-size: 19px; }

/* ---------- toc ---------- */
.u-toc { display: grid; gap: 2px; }

.u-toc a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 14px;
  border-left: 2px solid var(--line);
  font-size: 14px;
  color: var(--ink-soft);
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease);
}

.u-toc a:hover { border-left-color: var(--line-strong); color: var(--ink); }

.u-toc a.is-active {
  border-left-color: var(--gold);
  background: var(--paper-2);
  color: var(--ink);
  font-weight: 700;
}

.u-toc__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 15px;
  color: var(--gold-deep);
  letter-spacing: 0;
}

/* ---------- image frames ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  background: var(--night);
  border: 1px solid var(--line);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.media-frame--slant {
  clip-path: polygon(0 0, 100% 0, 100% 90%, 0 100%);
}

.media-frame__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 14px;
  background: var(--night);
  color: var(--paper);
  font-size: 12px;
  letter-spacing: 0.08em;
}

/* ---------- reveal protocol ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.32s var(--ease), transform 0.32s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}

[data-reveal="right"] { transform: translateX(8px); }

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

/* =========================================================
   HEADER
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 12px 20px;
  background: var(--gold);
  color: #231402;
  font-weight: 700;
  font-size: 14px;
  border-radius: 8px;
  transform: translateY(-180%);
  transition: transform 0.2s var(--ease);
}

.skip-link:focus { transform: none; }

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: rgba(63, 224, 180, 0.14);
  z-index: 3;
}

.scroll-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--teal), var(--gold));
}

/* data strip */
.data-strip {
  position: relative;
  z-index: 2;
  max-height: 52px;
  overflow: hidden;
  background: var(--night);
  color: var(--on-dark);
  transition: max-height 0.28s var(--ease), opacity 0.28s var(--ease);
}

.site-header[data-condensed] .data-strip {
  max-height: 0;
  opacity: 0;
}

.data-strip__inner {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
  height: 38px;
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 12px;
  letter-spacing: 0.06em;
}

.data-strip__badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  flex: none;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--teal);
}

.data-strip__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--teal);
  animation: pulse-dot 1.8s var(--ease) infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.35; transform: scale(0.72); }
}

.data-strip__viewport {
  position: relative;
  flex: 1 1 auto;
  height: 38px;
  overflow: hidden;
}

.data-strip__item {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.data-strip__item.is-active { opacity: 1; transform: none; }

.data-strip__pause {
  flex: none;
  padding: 4px 12px;
  background: transparent;
  border: 1px solid rgba(245, 241, 230, 0.28);
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--on-dark);
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.data-strip__pause:hover,
.data-strip__pause[aria-pressed="true"] {
  color: var(--teal);
  border-color: var(--teal);
}

/* nav islands */
.nav-shell {
  position: relative;
  padding: 14px var(--gutter) 10px;
  transition: padding 0.28s var(--ease);
}

.site-header[data-condensed] .nav-shell { padding-block: 8px; }

.nav-shell__inner {
  max-width: var(--maxw);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.brand-island {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: none;
  padding: 6px 18px 6px 6px;
  background: rgba(245, 241, 230, 0.94);
  border: 1px solid var(--line);
  border-radius: 999px;
  backdrop-filter: blur(10px);
}

.brand-island__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--pitch);
  color: var(--gold);
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand-island__name {
  display: block;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: 0.01em;
}

.brand-island__desc {
  display: block;
  font-size: 11px;
  line-height: 1.25;
  letter-spacing: 0.14em;
  color: var(--ink-soft);
}

.nav-capsule {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px;
  background: rgba(15, 30, 56, 0.94);
  border: 1px solid rgba(63, 224, 180, 0.22);
  border-radius: 999px;
  backdrop-filter: blur(10px);
}

.nav-capsule__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  display: block;
  padding: 9px 14px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: rgba(245, 241, 230, 0.82);
  white-space: nowrap;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.nav-link:hover { background: rgba(245, 241, 230, 0.12); color: #fff; }

.nav-link[aria-current="page"] {
  background: var(--gold);
  color: #231402;
}

.quick-entry {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-left: 8px;
  border-left: 1px solid rgba(245, 241, 230, 0.18);
}

.quick-chip {
  padding: 7px 12px;
  border: 1px solid rgba(63, 224, 180, 0.34);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--teal);
  white-space: nowrap;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.quick-chip:hover { background: var(--teal); color: #062820; border-color: var(--teal); }

.quick-chip--gold {
  color: var(--gold);
  border-color: rgba(240, 160, 60, 0.5);
}

.quick-chip--gold:hover { background: var(--gold); color: #231402; border-color: var(--gold); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 10px 16px;
  background: var(--night);
  border: 1px solid rgba(63, 224, 180, 0.28);
  border-radius: 999px;
  color: var(--paper);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  cursor: pointer;
}

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  background: var(--teal);
  border-radius: 2px;
  transition: transform 0.22s var(--ease), opacity 0.22s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer {
  position: relative;
  margin-top: clamp(64px, 9vw, 120px);
  padding: clamp(52px, 7vw, 92px) 0 30px;
  background: var(--pitch);
  color: var(--on-dark);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: -4%;
  width: 108%;
  height: 6px;
  background: linear-gradient(90deg, var(--gold), var(--gold-deep) 55%, var(--teal));
  transform: skewY(calc(var(--slant) * -1));
  transform-origin: left top;
}

.footer-shell {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(240px, 1.5fr) repeat(3, minmax(150px, 1fr));
  gap: clamp(26px, 4vw, 56px);
}

.footer-brand__mark {
  font-size: clamp(30px, 4.2vw, 48px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.footer-brand__line {
  margin-top: 12px;
  max-width: 26em;
  font-size: 14px;
  line-height: 1.7;
  color: var(--on-dark);
}

.footer-brand__icp {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--teal);
}

.footer-cta {
  display: inline-flex;
  margin-top: 20px;
  padding: 11px 24px;
  background: var(--gold);
  border-radius: 999px;
  color: #231402;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.03em;
  transition: background 0.2s var(--ease), color 0.2s var(--ease);
}

.footer-cta:hover { background: var(--gold-deep); color: #fff; }

.footer-col__title {
  margin-bottom: 14px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.footer-col__list { display: grid; gap: 9px; }

.footer-link {
  font-size: 14px;
  line-height: 1.6;
  color: var(--on-dark);
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.footer-link:hover { color: var(--paper); border-bottom-color: var(--teal); }

.footer-contact {
  margin-top: clamp(30px, 4vw, 52px);
  padding-top: clamp(24px, 3vw, 36px);
  border-top: 1px solid rgba(245, 241, 230, 0.16);
}

.footer-contact__title {
  margin-bottom: 16px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--teal);
}

.footer-contact__list {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 32px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
}

.contact-item--wide { flex-basis: 100%; }

.contact-item__label {
  flex: none;
  padding: 3px 8px;
  border: 1px solid rgba(245, 241, 230, 0.22);
  border-radius: 4px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--on-dark-soft);
}

.contact-item__value {
  font-family: var(--font-num);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.contact-item--wide .contact-item__value {
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.6;
}

.contact-copy {
  flex: none;
  padding: 4px 12px;
  background: transparent;
  border: 1px solid rgba(63, 224, 180, 0.36);
  border-radius: 999px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--teal);
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.contact-copy:hover { background: rgba(63, 224, 180, 0.16); }

.contact-copy[data-copied="true"] {
  background: var(--teal);
  border-color: var(--teal);
  color: #062820;
}

.contact-copy[data-copied="false"] {
  border-color: var(--red);
  color: #F4A79A;
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: clamp(24px, 3vw, 38px);
  padding-top: 20px;
  border-top: 1px solid rgba(245, 241, 230, 0.16);
  font-size: 12.5px;
  color: var(--on-dark-soft);
}

.footer-note { max-width: 62ch; }

.footer-copy {
  font-family: var(--font-num);
  letter-spacing: 0.04em;
}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 1024px) {
  .nav-toggle { display: inline-flex; }

  .brand-island__desc { display: none; }

  .nav-capsule {
    position: absolute;
    top: calc(100% + 4px);
    left: var(--gutter);
    right: var(--gutter);
    display: block;
    padding: 12px;
    border-radius: 20px;
    background: rgba(11, 27, 46, 0.98);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity 0.22s var(--ease), transform 0.22s var(--ease), visibility 0.22s var(--ease);
  }

  .nav-capsule[data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav-capsule__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    padding: 13px 16px;
    border-radius: 12px;
    font-size: 16px;
  }

  .quick-entry {
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 8px;
    padding: 12px 4px 2px;
    border-left: 0;
    border-top: 1px solid rgba(245, 241, 230, 0.18);
  }

  body.is-nav-open { overflow: hidden; }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .u-split,
  .u-split--reverse { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 720px) {
  body { font-size: 16px; }

  .data-strip__badge { display: none; }

  .data-strip__item { font-size: 11.5px; letter-spacing: 0.04em; }

  .data-strip__pause { font-size: 10px; padding: 3px 10px; }

  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 28px; }

  .footer-contact__list { flex-direction: column; align-items: flex-start; gap: 12px; }

  .footer-base { flex-direction: column; }
}

@media (max-width: 420px) {
  .brand-island { padding-right: 12px; }
  .brand-island__name { font-size: 15px; }
  .nav-toggle__label { display: none; }
}

/* =========================================================
   MOTION PREFERENCES
   ========================================================= */
@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;
    transition-delay: 0ms !important;
  }

  [data-reveal] {
    transform: none !important;
    opacity: 0;
    transition: opacity 0.001ms linear !important;
  }

  [data-reveal].is-in { opacity: 1; }

  .data-strip__dot { animation: none; }
}