/* ==========================================================================
   天空竞技 · Sky Sports China Shared Stylesheet
   文件：/assets/site.css
   ========================================================================== */

:root {
  --space-blue-900: #0a1428;
  --space-blue-700: #0f2040;
  --space-blue-500: #1a3a6b;
  --neon-green-400: #00ff87;
  --neon-green-300: #66ffb2;
  --gold-500: #ffd700;
  --text-primary: #e8f0ff;
  --text-secondary: #a3b8d9;
  --ink-900: #05080f;
  --font-display: "Archivo Black", "Arial Black", "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, "PingFang SC", monospace;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --container-max: 1280px;
  --container-pad: 24px;
}

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

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text-primary);
  background-color: var(--space-blue-900);
  background-image:
    linear-gradient(rgba(0, 255, 135, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 255, 135, 0.025) 1px, transparent 1px);
  background-size: 34px 34px;
  min-height: 100vh;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0 0 0.55em;
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.12;
  color: var(--text-primary);
}

p {
  margin: 0 0 1em;
  overflow-wrap: break-word;
}

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

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

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

::selection {
  background: var(--neon-green-400);
  color: var(--ink-900);
}

:focus-visible {
  outline: 2px solid var(--neon-green-400);
  outline-offset: 3px;
  border-radius: 2px;
}

#main-content {
  display: block;
  min-height: 62vh;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

/* ---------- Page skeleton ---------- */

.page-container {
  padding-block: 48px 72px;
}

.section {
  padding-block: 40px;
}

.section--first {
  padding-top: 4px;
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}

.section-title {
  margin: 0;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  line-height: 1.08;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--neon-green-400);
  text-transform: uppercase;
}

.eyebrow::before {
  content: "//";
  color: var(--gold-500);
}

.section-more {
  font-size: 0.875rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--space-blue-500);
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.section-more:hover {
  color: var(--neon-green-300);
  border-color: var(--neon-green-400);
}

/* ---------- Skip link ---------- */

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 300;
  padding: 10px 16px;
  background: var(--neon-green-400);
  color: var(--ink-900);
  font-weight: 800;
  font-size: 0.875rem;
  border-radius: 2px;
  transform: translateY(-220%);
  transition: transform 0.2s ease;
}

.skip-link:focus-visible {
  transform: translateY(0);
}

/* ---------- Header ---------- */

.site-header {
  position: relative;
  z-index: 100;
}

.header-topbar {
  background: var(--ink-900);
  border-bottom: 1px solid var(--space-blue-500);
}

.header-topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 36px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
}

.header-ticker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.ticker-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--neon-green-400);
  box-shadow: 0 0 0 2px rgba(0, 255, 135, 0.2);
  animation: ticker-pulse 2s ease-in-out infinite;
}

@keyframes ticker-pulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.35;
  }
}

.ticker-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-top-support {
  color: var(--text-secondary);
  white-space: nowrap;
}

.header-main {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(10, 20, 40, 0.92);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--space-blue-500);
}

.header-main::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 160px;
  height: 2px;
  background: linear-gradient(90deg, var(--neon-green-400), var(--gold-500));
  z-index: 1;
}

.header-main-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 72px;
}

.brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  margin-right: auto;
  padding-block: 8px;
  line-height: 1;
}

.brand-name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: 0.04em;
  border-left: 3px solid var(--neon-green-400);
  padding-left: 10px;
  color: var(--text-primary);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.28em;
  margin-left: 13px;
  color: var(--neon-green-400);
  text-transform: uppercase;
}

.site-nav {
  display: block;
}

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

.nav-list li {
  display: flex;
  align-items: center;
  counter-increment: nav-index;
}

.nav-list li + li::before {
  content: "";
  width: 1px;
  height: 18px;
  margin: 0 4px;
  background: var(--space-blue-500);
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 12px 10px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-primary);
  white-space: nowrap;
  transition: color 0.2s ease;
}

.nav-link::before {
  content: counter(nav-index, decimal-leading-zero) "/";
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--neon-green-400);
  opacity: 0.85;
}

.nav-link::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 6px;
  height: 2px;
  background: linear-gradient(90deg, var(--neon-green-400), var(--gold-500));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.nav-link:hover {
  color: var(--neon-green-300);
}

.nav-link:hover::after,
.nav-link[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-link[aria-current="page"] {
  color: var(--neon-green-400);
}

.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  background: var(--neon-green-400);
  color: var(--ink-900);
  border: 1px solid var(--neon-green-400);
  font-family: var(--font-body);
  font-size: 0.825rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  white-space: nowrap;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 50%, calc(100% - 10px) 100%, 0 100%);
  transition: background 0.2s ease, transform 0.2s ease;
}

.cta-btn:hover {
  background: var(--neon-green-300);
  border-color: var(--neon-green-300);
  color: var(--ink-900);
  transform: translateX(2px);
}

.cta-btn:focus-visible {
  clip-path: none;
  outline: 2px solid var(--neon-green-300);
  outline-offset: 3px;
}

.cta-arrow {
  font-family: var(--font-mono);
  font-size: 1rem;
  line-height: 1;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  background: transparent;
  border: 1px solid var(--space-blue-500);
  color: var(--text-primary);
  font-size: 0.75rem;
  font-weight: 700;
  transition: border-color 0.2s ease;
}

.nav-toggle:hover {
  border-color: var(--neon-green-400);
}

.nav-toggle[aria-expanded="true"] {
  border-color: var(--neon-green-400);
}

.toggle-bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--neon-green-400);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.toggle-text {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}

.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(1) {
  transform: translateY(4px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .toggle-bar:nth-child(3) {
  transform: translateY(-4px) rotate(-45deg);
}

.header-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  z-index: 220;
  background: linear-gradient(90deg, var(--neon-green-400), var(--gold-500));
  pointer-events: none;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid var(--neon-green-400);
  background: transparent;
  color: var(--neon-green-400);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
  background: var(--neon-green-400);
  color: var(--ink-900);
}

.btn--primary {
  background: var(--neon-green-400);
  color: var(--ink-900);
}

.btn--primary:hover {
  background: var(--neon-green-300);
  border-color: var(--neon-green-300);
  color: var(--ink-900);
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--ink-900);
  border-top: 2px solid var(--neon-green-400);
  margin-top: 64px;
  position: relative;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -2px;
  right: 0;
  width: 120px;
  height: 2px;
  background: var(--gold-500);
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: 32px 48px;
  padding-block: 56px 40px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-logo {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 900;
  border-left: 3px solid var(--neon-green-400);
  padding-left: 12px;
}

.footer-sub {
  margin: 0 0 20px 15px;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.28em;
  color: var(--neon-green-400);
  text-transform: uppercase;
}

.footer-trust {
  max-width: 34ch;
  margin: 0 0 24px;
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.75;
}

.footer-cta {
  align-self: flex-start;
}

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

.footer-heading {
  margin: 0 0 16px;
  padding-bottom: 8px;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  color: var(--gold-500);
  text-transform: uppercase;
  border-bottom: 1px solid var(--space-blue-500);
}

.footer-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-list a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-list a:hover {
  color: var(--neon-green-300);
  padding-left: 4px;
}

.footer-contact-item {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.footer-note {
  margin: 16px 0 0;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--text-secondary);
  opacity: 0.85;
}

.footer-bottom {
  border-top: 1px solid var(--space-blue-500);
}

.footer-bottom-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 6px 16px;
  padding-block: 14px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

.footer-bottom-inner p {
  margin: 0;
}

/* ---------- Breadcrumb ---------- */

.breadcrumb {
  list-style: none;
  margin: 0;
  padding: 16px 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

.breadcrumb li {
  display: inline-flex;
  align-items: center;
}

.breadcrumb li::before {
  content: "/";
  margin-right: 8px;
  color: var(--space-blue-500);
}

.breadcrumb li:first-child::before {
  display: none;
}

.breadcrumb a {
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.breadcrumb a:hover {
  color: var(--neon-green-300);
}

.breadcrumb [aria-current="page"] {
  color: var(--text-primary);
}

/* ---------- Grid, Card, Tag, Data ---------- */

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

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

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

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card {
  position: relative;
  padding: 24px;
  background: var(--space-blue-700);
  border: 1px solid var(--space-blue-500);
  border-top: 2px solid var(--neon-green-400);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.card:hover {
  border-color: var(--neon-green-400);
  transform: translateY(-3px);
}

.card__title {
  margin: 0 0 8px;
  font-size: 1.125rem;
  font-weight: 800;
  line-height: 1.25;
}

.card__text {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border: 1px solid var(--space-blue-500);
  background: rgba(0, 255, 135, 0.06);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--neon-green-400);
}

.tag--gold {
  border-color: rgba(255, 215, 0, 0.4);
  background: rgba(255, 215, 0, 0.06);
  color: var(--gold-500);
}

.data-text {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  color: var(--neon-green-400);
}

/* ---------- Image frame ---------- */

.image-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background: linear-gradient(135deg, var(--space-blue-500) 0%, var(--space-blue-900) 100%);
  border: 1px solid var(--space-blue-500);
  isolation: isolate;
}

.image-frame--16x9 {
  aspect-ratio: 16 / 9;
}

.image-frame--4x3 {
  aspect-ratio: 4 / 3;
}

.image-frame--21x9 {
  aspect-ratio: 21 / 9;
}

.image-frame::before {
  content: "IMAGE";
  position: absolute;
  top: 8px;
  left: 8px;
  z-index: 2;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  letter-spacing: 0.18em;
  color: var(--neon-green-400);
  background: var(--ink-900);
  border-left: 2px solid var(--neon-green-400);
}

.image-frame[data-label]::before {
  content: attr(data-label);
}

.image-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(135deg, transparent 55%, rgba(0, 255, 135, 0.18) 100%),
    repeating-linear-gradient(90deg, transparent 0 12px, rgba(233, 240, 255, 0.04) 12px 13px);
  pointer-events: none;
}

/* ---------- Tabs ---------- */

.tabs {
  margin-bottom: 28px;
}

.tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 0 24px;
  border-bottom: 1px solid var(--space-blue-500);
}

.tab {
  appearance: none;
  border: 0;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 12px 2px;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.tab:hover {
  color: var(--neon-green-300);
}

.tab[aria-selected="true"] {
  color: var(--neon-green-400);
  border-bottom-color: var(--neon-green-400);
}

.tabpanel {
  padding-block: 24px;
}

.tabpanel[hidden] {
  display: none;
}

/* ---------- Reveal on scroll ---------- */

html.js [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.45s ease, transform 0.45s ease;
}

html.js [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- Responsive ---------- */

@media (max-width: 640px) {
  :root {
    --container-pad: 16px;
  }
}

@media (max-width: 1023.98px) {
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    display: none;
    margin: 0;
    padding: 8px 0 12px;
    background: var(--space-blue-900);
    border-bottom: 1px solid var(--neon-green-400);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.35);
    z-index: 80;
  }

  .site-nav[data-open] {
    display: block;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav-list li + li::before {
    display: none;
  }

  .nav-link {
    justify-content: space-between;
    padding: 12px 20px;
    font-size: 1rem;
  }

  .nav-link::after {
    left: 20px;
    right: 20px;
    bottom: 4px;
  }
}

@media (max-width: 767.98px) {
  .cta-btn {
    display: none;
  }

  .brand-name {
    font-size: 1.15rem;
  }

  .brand-sub {
    font-size: 0.55rem;
    letter-spacing: 0.2em;
  }
}

@media (max-width: 599.98px) {
  .header-top-support {
    display: none;
  }
}

@media (max-width: 1023.98px) {
  .footer-main {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 600.98px) {
  .footer-main {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-contact-item {
    font-size: 0.8125rem;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* ---------- Reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001s !important;
  }

  .ticker-dot {
    animation: none;
  }

  html.js [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ---------- Scrollbar (desktop only) ---------- */

@media (min-width: 992px) {
  ::-webkit-scrollbar {
    width: 10px;
    height: 10px;
  }

  ::-webkit-scrollbar-track {
    background: var(--ink-900);
  }

  ::-webkit-scrollbar-thumb {
    background: var(--space-blue-500);
  }

  ::-webkit-scrollbar-thumb:hover {
    background: var(--neon-green-400);
  }
}