/* ============================================================
   九游竞技场 / Shared Site CSS
   设计语言：体育数据广播台 × 数字展览馆
   ============================================================ */

/* ---------- 0. Design Tokens ---------- */
:root {
  --c-midnight: #0a1f33;
  --c-navy: #123a5c;
  --c-steel: #1e5a8a;
  --c-paper: #f7f5f0;
  --c-signal: #ff7a00;
  --c-gold: #c9a961;
  --c-graphite: #2d2d2d;
  --c-slate: #5b6b7a;
  --c-line: #d8d2c8;

  --c-white-dim: rgba(247, 245, 240, 0.72);
  --c-white-faint: rgba(247, 245, 240, 0.5);

  --f-heading: Georgia, "Noto Serif SC", "Songti SC", serif;
  --f-body: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;

  --fs-display: 72px;
  --fs-heading-lg: 48px;
  --fs-heading-md: 28px;
  --fs-body: 16px;
  --fs-caption: 13px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;

  --container-max: 1280px;
  --container-narrow: 960px;
  --container-wide: 1440px;
  --container-pad: 24px;

  --radius: 2px;
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;

  --z-header: 100;
  --z-progress: 1000;
  --z-skip: 2000;
}

/* ---------- 1. Reset & Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  font-family: var(--f-body);
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--c-graphite);
  background: var(--c-paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

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

ul,
ol {
  padding-left: 1.25em;
}

li + li {
  margin-top: 2px;
}

table {
  border-collapse: collapse;
  width: 100%;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--f-heading);
  line-height: 1.25;
  color: var(--c-graphite);
  margin-bottom: 0.5em;
  font-weight: 700;
}

h1 {
  font-size: var(--fs-heading-md);
}

h2 {
  font-size: var(--fs-heading-md);
}

h3 {
  font-size: 22px;
}

h4 {
  font-size: 18px;
}

h5,
h6 {
  font-size: 15px;
}

p {
  margin-bottom: 1em;
}

@media (min-width: 768px) {
  h1 {
    font-size: var(--fs-heading-lg);
  }
}

/* ---------- 2. Layout Containers ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.container--wide {
  max-width: var(--container-wide);
}

.grid {
  display: grid;
  gap: 24px;
}

.grid--2 {
  grid-template-columns: 1fr;
}

.grid--3 {
  grid-template-columns: 1fr;
}

.grid--4 {
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid--2,
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid--3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .grid--4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-head {
  padding: 24px 0 32px;
  border-bottom: 1px solid var(--c-line);
  margin-bottom: 40px;
}

/* ---------- 3. Skip Link ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 16px;
  z-index: var(--z-skip);
  background: var(--c-signal);
  color: var(--c-midnight);
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 600;
  border-radius: 0 0 4px 4px;
  transform: translateY(-120%);
  transition: transform var(--transition-fast);
}

.skip-link:focus {
  transform: translateY(0);
  outline: 3px solid var(--c-paper);
  outline-offset: -1px;
}

/* ---------- 4. Site Header ---------- */
.site-header {
  background: var(--c-midnight);
}

.site-header__ticker {
  background: var(--c-navy);
  border-bottom: 1px solid rgba(247, 245, 240, 0.08);
  color: var(--c-white-dim);
}

.site-header__ticker-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-top: 8px;
  padding-bottom: 8px;
}

.ticker-live,
.ticker-note {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.04em;
}

.ticker-live {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--c-paper);
  font-weight: 600;
}

.ticker-live__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-signal);
  animation: ticker-pulse 1.6s ease-in-out infinite;
}

@keyframes ticker-pulse {
  0%,
  100% {
    opacity: 1;
    box-shadow: 0 0 0 0 rgba(255, 122, 0, 0.45);
  }

  50% {
    opacity: 0.65;
    box-shadow: 0 0 0 4px rgba(255, 122, 0, 0);
  }
}

.ticker-divider {
  width: 1px;
  height: 14px;
  background: var(--c-steel);
  opacity: 0.7;
}

.ticker-note {
  color: var(--c-white-dim);
}

@media (max-width: 767px) {
  .ticker-note,
  .ticker-divider {
    display: none;
  }
}

.site-header__main {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: var(--c-midnight);
  box-shadow: 0 4px 16px rgba(10, 31, 51, 0.18);
}

@media (min-width: 1024px) {
  .site-header__main {
    background: linear-gradient(
      90deg,
      var(--c-navy) 0%,
      var(--c-navy) 34%,
      var(--c-midnight) 34%,
      var(--c-midnight) 100%
    );
  }
}

.site-header__main::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(
    90deg,
    var(--c-signal) 0%,
    var(--c-signal) 220px,
    rgba(30, 90, 138, 0.35) 220px,
    rgba(30, 90, 138, 0.35) 100%
  );
  pointer-events: none;
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 76px;
}

/* ---------- 5. Brand ---------- */
.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.site-brand__mark {
  font-family: var(--f-heading);
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--c-paper);
  background: var(--c-midnight);
  padding: 8px 10px;
  border-left: 3px solid var(--c-signal);
  border-radius: 0 4px 4px 0;
  white-space: nowrap;
}

.site-brand__num {
  color: var(--c-signal);
}

.site-brand__meta {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.site-brand__cn {
  color: var(--c-paper);
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.site-brand__en {
  color: var(--c-white-faint);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-top: 2px;
}

/* ---------- 6. Actions ---------- */
.site-header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: auto;
}

.member-entry {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border: 1px solid rgba(247, 245, 240, 0.22);
  background: rgba(247, 245, 240, 0.04);
  color: var(--c-paper);
  font-size: 14px;
  line-height: 1;
  white-space: nowrap;
  transition: border-color var(--transition-fast), color var(--transition-fast),
    background-color var(--transition-fast);
}

.member-entry:hover {
  border-color: var(--c-signal);
  color: var(--c-signal);
  background: rgba(255, 122, 0, 0.08);
}

.member-entry__glyph {
  color: var(--c-signal);
  font-size: 12px;
}

@media (max-width: 767px) {
  .member-entry__text {
    display: none;
  }

  .member-entry {
    padding: 8px;
  }
}

/* ---------- 7. Navigation ---------- */
.site-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  z-index: calc(var(--z-header) - 1);
  background: var(--c-midnight);
  border-bottom: 2px solid var(--c-signal);
  box-shadow: 0 16px 32px rgba(10, 31, 51, 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--transition-base), transform var(--transition-base),
    visibility var(--transition-base);
}

.site-nav[data-open] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.site-nav__list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-nav__item {
  border-bottom: 1px solid rgba(247, 245, 240, 0.06);
}

.site-nav__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px var(--container-pad);
  color: var(--c-white-dim);
  font-size: 15px;
  font-weight: 500;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.site-nav__link:hover {
  color: var(--c-paper);
  background: rgba(247, 245, 240, 0.04);
}

.site-nav__link[aria-current="page"] {
  color: var(--c-paper);
  background: rgba(255, 122, 0, 0.08);
}

.site-nav__link[aria-current="page"] .site-nav__idx {
  color: var(--c-signal);
}

.site-nav__idx {
  font-size: 11px;
  font-family: var(--f-body);
  color: var(--c-gold);
  letter-spacing: 0.06em;
  min-width: 20px;
  font-weight: 600;
}

@media (min-width: 1024px) {
  .site-nav {
    position: static;
    flex: 1;
    display: flex;
    justify-content: center;
    opacity: 1;
    visibility: visible;
    transform: none;
    background: transparent;
    border-bottom: 0;
    box-shadow: none;
  }

  .site-nav__list {
    display: flex;
    align-items: center;
    gap: 2px;
  }

  .site-nav__item {
    border-bottom: 0;
  }

  .site-nav__link {
    padding: 10px 14px;
    border-bottom: 2px solid transparent;
  }

  .site-nav__link:hover {
    background: transparent;
    border-bottom-color: var(--c-signal);
  }

  .site-nav__link[aria-current="page"] {
    background: transparent;
    border-bottom-color: var(--c-signal);
  }
}

/* ---------- 8. Nav Toggle ---------- */
.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 10px 12px;
  background: rgba(247, 245, 240, 0.06);
  border: 1px solid rgba(247, 245, 240, 0.16);
  color: var(--c-paper);
  cursor: pointer;
  line-height: 1;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--c-signal);
  background: rgba(255, 122, 0, 0.08);
}

.nav-toggle__line {
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 1px;
  transition: transform var(--transition-base);
}

.nav-toggle__text {
  font-size: 10px;
  letter-spacing: 0.08em;
  margin-top: 2px;
}

.nav-toggle.is-active .nav-toggle__line:nth-child(1) {
  transform: translateY(3.5px) rotate(45deg);
}

.nav-toggle.is-active .nav-toggle__line:nth-child(2) {
  transform: translateY(-3.5px) rotate(-45deg);
}

.nav-toggle.is-active .nav-toggle__text {
  display: none;
}

@media (min-width: 1024px) {
  .nav-toggle {
    display: none;
  }
}

/* ---------- 9. Scroll Progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--c-signal);
  transform: scaleX(0);
  transform-origin: 0 50%;
  z-index: var(--z-progress);
  pointer-events: none;
  will-change: transform;
}

/* ---------- 10. Site Footer ---------- */
.site-footer {
  background: var(--c-midnight);
  color: var(--c-white-dim);
}

.site-footer__main {
  padding-top: 56px;
  padding-bottom: 48px;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.site-footer__brand .site-brand__mark {
  background: var(--c-navy);
}

.site-footer__brand .site-brand__cn {
  color: var(--c-paper);
}

.site-footer__statement {
  margin-top: 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-white-dim);
  max-width: 36ch;
}

.site-footer__heading {
  font-family: var(--f-heading);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--c-paper);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(247, 245, 240, 0.1);
}

.site-footer__list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-footer__list li {
  margin: 0;
  padding: 3px 0;
}

.site-footer__list a {
  color: var(--c-white-dim);
  font-size: 15px;
  transition: color var(--transition-fast);
}

.site-footer__list a:hover {
  color: var(--c-signal);
}

.site-footer__list--plain {
  color: var(--c-white-dim);
  font-size: 14px;
  line-height: 1.7;
}

.site-footer__bottom {
  border-top: 1px solid rgba(247, 245, 240, 0.08);
  padding: 20px 0;
  background: rgb(7, 23, 38);
}

.site-footer__bottom-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
}

.site-footer__bottom-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--c-white-faint);
}

.site-footer__bottom-group p {
  margin: 0;
}

.site-footer__sep {
  color: var(--c-steel);
}

@media (min-width: 768px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    column-gap: 40px;
    row-gap: 48px;
  }

  .site-footer__brand {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1024px) {
  .site-footer__grid {
    grid-template-columns: 2.4fr 1fr 1.2fr 1fr;
    gap: 48px;
  }

  .site-footer__brand {
    grid-column: auto;
  }
}

/* ---------- 11. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 600;
  font-family: var(--f-body);
  line-height: 1.2;
  cursor: pointer;
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast),
    border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.btn--primary {
  background: var(--c-signal);
  border-color: var(--c-signal);
  color: var(--c-midnight);
}

.btn--primary:hover {
  background: #e86f00;
  border-color: #e86f00;
}

.btn--ghost {
  border-color: var(--c-line);
  color: var(--c-graphite);
  background: transparent;
}

.btn--ghost:hover {
  border-color: var(--c-signal);
  color: var(--c-signal);
}

.btn--dark {
  background: var(--c-midnight);
  border-color: var(--c-midnight);
  color: var(--c-paper);
}

.btn--dark:hover {
  background: var(--c-navy);
  border-color: var(--c-navy);
}

/* ---------- 12. Breadcrumbs ---------- */
.breadcrumbs {
  font-size: 13px;
  margin-bottom: 16px;
}

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  list-style: none;
  padding: 0;
}

.breadcrumbs__link {
  color: var(--c-slate);
  transition: color var(--transition-fast);
}

.breadcrumbs__link:hover {
  color: var(--c-signal);
}

.breadcrumbs__sep {
  color: var(--c-line);
  margin-inline: 6px;
}

.breadcrumbs__current {
  color: var(--c-graphite);
}

/* ---------- 13. Common Content Components ---------- */
.section-title {
  font-family: var(--f-heading);
  font-size: var(--fs-heading-md);
  color: var(--c-graphite);
  line-height: 1.25;
  margin-bottom: 16px;
}

.section-title__index {
  display: block;
  font-family: var(--f-body);
  font-size: var(--fs-caption);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-signal);
  margin-bottom: 8px;
}

.exhibit-card {
  background: var(--c-paper);
  border: 1px solid var(--c-line);
  border-top: 3px solid var(--c-navy);
  border-radius: var(--radius);
  padding: 28px;
}

.exhibit-card__num {
  font-family: var(--f-heading);
  font-size: 32px;
  color: var(--c-gold);
  line-height: 1;
}

.exhibit-card__title {
  font-family: var(--f-heading);
  font-size: 22px;
  color: var(--c-graphite);
  margin-top: 12px;
}

.exhibit-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--c-navy);
  color: var(--c-paper);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  border-radius: var(--radius);
}

.exhibit-label::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-signal);
}

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

.specimen__index {
  font-family: var(--f-heading);
  color: var(--c-gold);
  font-size: 20px;
  font-weight: 700;
}

.data-float {
  background: var(--c-midnight);
  color: var(--c-paper);
  padding: 20px 24px;
  border-left: 4px solid var(--c-signal);
  border-radius: var(--radius);
}

.data-float__value {
  font-family: var(--f-heading);
  font-size: 28px;
  color: var(--c-signal);
  line-height: 1.2;
}

.data-float__label {
  font-size: 13px;
  color: var(--c-white-dim);
  margin-top: 4px;
}

/* ---------- 14. Media Frame ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--c-navy);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.media-frame--portrait {
  aspect-ratio: 3 / 4;
}

.media-frame--wide {
  aspect-ratio: 21 / 9;
}

/* ---------- 15. Utility ---------- */
.on-dark {
  color: var(--c-white-dim);
}

.on-dark h1,
.on-dark h2,
.on-dark h3,
.on-dark h4,
.on-dark h5,
.on-dark h6 {
  color: var(--c-paper);
}

.on-dark .section-title {
  color: var(--c-paper);
}

.on-dark .section-title__index {
  color: var(--c-signal);
}

.text-caption {
  font-size: var(--fs-caption);
  color: var(--c-slate);
}

.text-center {
  text-align: center;
}

/* ---------- 16. Accessibility ---------- */
:focus-visible {
  outline: 2px solid var(--c-signal);
  outline-offset: 3px;
  border-radius: 2px;
}

::selection {
  background: var(--c-signal);
  color: var(--c-midnight);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .ticker-live__dot {
    animation: none;
    box-shadow: none;
  }
}