/* ============================================================
   必一竞技 · biyi-joy.com.cn
   全站共享样式 /assets/site.css
   视觉：未来赛事场馆 · 深空网格 · 荧光绿/电光蓝数据轨
   ============================================================ */

/* ---------- Design tokens ---------- */
:root {
  --bg-main: #0B0E14;
  --bg-surface: #131722;
  --bg-surface-alt: #1A1F2C;
  --bg-footer: #080A0F;
  --accent-green: #C6FF00;
  --accent-blue: #00E5FF;
  --accent-red: #FF3B30;
  --text-primary: #E8EAF6;
  --text-secondary: #9BA1B4;
  --border-subtle: #2A2E3D;
  --font-headline: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "SFMono-Regular", Consolas, monospace;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

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

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

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--bg-main);
  background-image:
    radial-gradient(ellipse 72% 42% at 50% -10%, rgba(0, 229, 255, 0.09), transparent 62%),
    linear-gradient(rgba(42, 46, 61, 0.15) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 46, 61, 0.15) 1px, transparent 1px);
  background-size: auto, 44px 44px, 44px 44px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--accent-green);
  color: var(--bg-main);
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 16px;
  font-family: var(--font-headline);
  font-style: italic;
  font-weight: 900;
  line-height: 1.18;
  color: var(--text-primary);
}
h1 { font-size: clamp(30px, 4.6vw, 48px); }
h2 { font-size: clamp(22px, 2.8vw, 34px); }
h3 { font-size: clamp(18px, 2vw, 24px); }
h4 { font-size: 18px; }
h5 { font-size: 16px; }
h6 { font-size: 14px; }

p { margin: 0 0 16px; }
ul, ol { margin: 0 0 16px; padding-left: 22px; }

a {
  color: var(--accent-blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 160ms ease;
}
a:hover { color: var(--accent-green); }

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

hr {
  height: 1px;
  margin: 28px 0;
  border: 0;
  background: var(--border-subtle);
}

/* ---------- Accessibility ---------- */
.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

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

#main-content:focus { outline: none; }

.skip-link {
  position: fixed;
  top: 14px;
  left: 14px;
  z-index: 600;
  display: inline-block;
  padding: 10px 18px;
  background: var(--accent-green);
  color: var(--bg-main);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transform: translateY(calc(-100% - 24px));
  transition: transform 180ms ease;
}
.skip-link:focus-visible { transform: translateY(0); }

/* ---------- Scroll progress / top rail ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 400;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-blue));
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
  will-change: transform;
}

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

main { display: block; }

.site-main {
  min-height: 62vh;
  padding: 44px 0 88px;
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--bg-main);
  border-bottom: 1px solid var(--border-subtle);
}

.site-header__bar-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 64px;
}

/* Brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
  text-decoration: none;
  color: var(--text-primary);
}
.brand:hover { color: var(--text-primary); }

.brand__glyph {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--accent-green);
  color: var(--bg-main);
  font-family: var(--font-headline);
  font-size: 19px;
  font-style: italic;
  font-weight: 900;
  line-height: 1;
}

.brand__text {
  font-family: var(--font-headline);
  font-size: 20px;
  font-style: italic;
  font-weight: 900;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.brand__status {
  width: 7px;
  height: 7px;
  flex-shrink: 0;
  background: var(--accent-green);
  animation: status-pulse 2s var(--ease-out) infinite;
}

@keyframes status-pulse {
  0% { box-shadow: 0 0 0 0 rgba(198, 255, 0, 0.55); }
  70% { box-shadow: 0 0 0 8px rgba(198, 255, 0, 0); }
  100% { box-shadow: 0 0 0 0 rgba(198, 255, 0, 0); }
}

/* Main nav */
.main-nav { margin-left: auto; }

.main-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.main-nav__item { margin: 0; }

.main-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 22px 14px 20px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: color 160ms ease;
}
.main-nav__link::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 12px;
  height: 2px;
  background: var(--accent-green);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 220ms var(--ease-out);
}
.main-nav__link:hover { color: var(--text-primary); }
.main-nav__link:hover::after,
.main-nav__link[aria-current="page"]::after { transform: scaleX(1); }
.main-nav__link[aria-current="page"] { color: var(--text-primary); }

.main-nav__index {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  color: var(--accent-blue);
}

.main-nav__label { line-height: 1; }

/* Nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  margin-left: auto;
  padding: 11px 10px;
  background: transparent;
  border: 1px solid var(--border-subtle);
  cursor: pointer;
}

.nav-toggle__line {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  transition: transform 180ms ease, opacity 180ms ease, background 180ms ease;
}

.nav-toggle:hover .nav-toggle__line { background: var(--accent-green); }
.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  background: var(--accent-green);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  background: var(--accent-green);
}

/* ---------- Footer ---------- */
.site-footer {
  padding: 64px 0 0;
  background-color: var(--bg-footer);
  background-image:
    linear-gradient(rgba(42, 46, 61, 0.22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 46, 61, 0.22) 1px, transparent 1px);
  background-size: 40px 40px;
  border-top: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 0.8fr 1fr 0.8fr;
  gap: 44px 48px;
  padding-bottom: 48px;
}

.site-footer__col { min-width: 0; }
.site-footer__col--brand { max-width: 44ch; }
.site-footer__col--nav,
.site-footer__col--legal { justify-self: start; }

.site-footer .brand { color: var(--text-primary); }

.site-footer__intro {
  margin: 16px 0 8px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
}

.site-footer__trust {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--text-secondary);
  opacity: 0.75;
}

.site-footer__heading {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 4px 0 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-style: normal;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-blue);
}
.site-footer__heading::before {
  content: "";
  width: 14px;
  height: 2px;
  flex-shrink: 0;
  background: var(--accent-green);
}

.site-footer__list {
  display: grid;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.site-footer__list li {
  margin: 0;
  font-size: 14px;
  overflow-wrap: anywhere;
}
.site-footer__list a {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  color: var(--text-secondary);
  font-size: 14px;
  text-decoration: none;
  transition: color 160ms ease, padding-left 160ms ease;
}
.site-footer__list a::before {
  content: "";
  width: 0;
  height: 2px;
  flex-shrink: 0;
  background: var(--accent-blue);
  transition: width 160ms ease;
}
.site-footer__list a:hover,
.site-footer__list a:focus-visible {
  color: var(--accent-green);
  padding-left: 2px;
}
.site-footer__list a:hover::before {
  width: 10px;
  background: var(--accent-green);
}

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

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 22px 0;
  border-top: 1px solid var(--border-subtle);
  font-size: 13px;
  color: var(--text-secondary);
  opacity: 0.8;
}

.site-footer__copy { margin: 0; }
.site-footer__icp {
  margin: 0;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 24px;
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease, transform 160ms ease;
}
.btn:hover { color: var(--text-primary); border-color: var(--accent-blue); }
.btn:active { transform: translateY(1px); }
.btn--primary {
  background: var(--accent-green);
  border-color: var(--accent-green);
  color: var(--bg-main);
}
.btn--primary:hover {
  background: rgba(198, 255, 0, 0.86);
  border-color: var(--accent-green);
  color: var(--bg-main);
}
.btn--ghost {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}
.btn--ghost:hover {
  background: rgba(0, 229, 255, 0.1);
  color: var(--accent-blue);
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 0;
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
}
.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--text-secondary);
}
.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent-blue);
}
.breadcrumb__item a { color: var(--text-secondary); text-decoration: none; transition: color 160ms ease; }
.breadcrumb__item a:hover { color: var(--accent-green); }
.breadcrumb__item[aria-current="page"] { color: var(--text-primary); }

/* ---------- Section head ---------- */
.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}
.section-head__title { margin: 0; }
.section-head__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-secondary);
  white-space: nowrap;
}

.kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-blue);
}

/* ---------- Grid ---------- */
.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)); }

/* ---------- Cards ---------- */
.card {
  position: relative;
  padding: 24px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  transition: border-color 200ms ease, transform 200ms ease;
}
.card:hover {
  border-color: rgba(198, 255, 0, 0.5);
  transform: translateY(-2px);
}
.card--cut {
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 0 100%);
  filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.35));
}
.card--live { border-top: 2px solid var(--accent-red); }
.card__title { margin-bottom: 8px; font-size: 20px; }
.card__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
}
.card__link {
  display: inline-block;
  margin-top: 12px;
  color: var(--accent-green);
  font-weight: 600;
  text-decoration: none;
}
.card__link:hover { text-decoration: underline; text-underline-offset: 4px; }

/* ---------- Tabs ---------- */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  margin: 0 0 24px;
  border-bottom: 1px solid var(--border-subtle);
}
.tabs__btn {
  position: relative;
  padding: 12px 18px 14px;
  background: transparent;
  border: 0;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: color 160ms ease;
}
.tabs__btn::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: -1px;
  height: 2px;
  background: var(--accent-green);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 180ms var(--ease-out);
}
.tabs__btn:hover { color: var(--text-primary); }
.tabs__btn[aria-selected="true"] { color: var(--accent-green); }
.tabs__btn[aria-selected="true"]::after { transform: scaleX(1); }
.tabs__panel { padding: 4px 0 8px; }
.tabs__panel[hidden] { display: none; }

/* ---------- Media frame ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background-color: var(--bg-surface);
  background-image:
    linear-gradient(135deg, rgba(0, 229, 255, 0.10), transparent 46%),
    linear-gradient(rgba(42, 46, 61, 0.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 46, 61, 0.5) 1px, transparent 1px);
  background-size: auto, 24px 24px, 24px 24px;
  border: 1px solid var(--border-subtle);
}
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--21x9 { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 46%, rgba(198, 255, 0, 0.10) 100%);
  pointer-events: none;
}
.media-frame__caption {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 2;
  margin: 0;
  padding: 4px 8px;
  background: rgba(11, 14, 20, 0.82);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-primary);
}

/* ---------- Live / score / tag ---------- */
.live-dot {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-red);
}
.live-dot::before {
  content: "";
  width: 7px;
  height: 7px;
  background: var(--accent-red);
  animation: live-blinking 1.4s steps(2, start) infinite;
}
@keyframes live-blinking { 50% { opacity: 0.25; } }

.scoreline {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 14px;
  font-family: var(--font-mono);
  font-size: 15px;
}
.scoreline__team { color: var(--text-primary); font-weight: 500; }
.scoreline__value {
  font-weight: 700;
  color: var(--accent-red);
  letter-spacing: 0.04em;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-blue);
}
.tag--live {
  color: var(--accent-red);
  border-color: rgba(255, 59, 48, 0.4);
}

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

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .main-nav__link { padding-left: 10px; padding-right: 10px; }
  .main-nav__link::after { left: 10px; right: 10px; }

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

@media (max-width: 767px) {
  .container {
    padding-left: 18px;
    padding-right: 18px;
  }

  .site-main {
    padding: 32px 0 64px;
  }

  .site-header__bar-inner {
    gap: 12px;
    min-height: 56px;
  }
  .brand__text { font-size: 18px; }
  .brand__glyph {
    width: 30px;
    height: 30px;
    font-size: 17px;
  }

  .nav-toggle { display: flex; }

  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 150;
    margin-left: 0;
    background: var(--bg-surface);
    border-top: 1px solid var(--border-subtle);
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: 0 30px 48px -24px rgba(0, 0, 0, 0.9);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-14px);
    transition: opacity 200ms ease, transform 200ms var(--ease-out), visibility 200ms;
  }
  .main-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .main-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 18px 16px;
  }
  .main-nav__item + .main-nav__item { border-top: 1px solid rgba(42, 46, 61, 0.65); }
  .main-nav__link {
    align-items: center;
    padding: 13px 6px;
    font-size: 15px;
  }
  .main-nav__link::after { display: none; }
  .main-nav__link:hover,
  .main-nav__link[aria-current="page"] {
    color: var(--accent-green);
    background: linear-gradient(90deg, rgba(198, 255, 0, 0.08), transparent 70%);
  }

  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .tabs {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 36px;
    padding-bottom: 36px;
  }
  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* ---------- Reduced motion ---------- */
@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;
  }
  .scroll-progress { will-change: auto; }
}