/* ============================================================
   B体育主站 · 共享样式 /assets/site.css
   ============================================================ */

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

html{
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

html,
body{ margin: 0; padding: 0; }

body{ min-height: 100vh; }

h1,h2,h3,h4,h5,h6,p,figure,blockquote,ul,ol,dl,dd{ margin: 0; }
ul,ol{ padding: 0; list-style: none; }

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

button{
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

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

/* ---------- 2. 变量 ---------- */
:root{
  /* 品牌色 */
  --ink: #050B18;
  --deep: #0A1426;
  --card: #0F1D33;
  --line: #17294A;
  --fog: #EAF2FF;
  --mute: #A9BBD6;
  --cyan: #35E6D0;
  --orange: #FF7A2F;
  --violet: #8B5CFF;
  --red: #FF3D6E;
  --green: #3BE08A;

  /* 形状 */
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-pill: 999px;

  /* 尺度 */
  --shell-max: 1440px;
  --pad-x: clamp(16px, 4vw, 48px);
  --header-h: 64px;
  --gap: 24px;

  /* 字体 */
  --font-sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", "Barlow Condensed", "SFMono-Regular",
    Consolas, "Liberation Mono", monospace;

  /* 动效 */
  --ease: cubic-bezier(.22, .61, .36, 1);
  --dur: 220ms;
}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  font-weight: 400;
  color: var(--fog);
  background-color: var(--ink);
  background-image:
    radial-gradient(900px 520px at 12% -8%, rgba(53, 230, 208, .10), transparent 66%),
    radial-gradient(820px 520px at 96% 4%, rgba(139, 92, 255, .13), transparent 70%),
    radial-gradient(760px 560px at 82% 92%, rgba(255, 122, 47, .07), transparent 72%);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,h2,h3,h4{
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--fog);
}

h1{ font-size: clamp(38px, 6.2vw, 84px); }
h2{ font-size: clamp(28px, 3.6vw, 46px); }
h3{ font-size: clamp(19px, 2vw, 24px); letter-spacing: -0.01em; }

p{ max-width: 76ch; color: var(--mute); }
strong{ color: var(--fog); font-weight: 700; }

::selection{ background: rgba(53, 230, 208, .28); color: var(--fog); }

/* ---------- 4. 全局焦点 ---------- */
:focus-visible{
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 5. 布局工具 ---------- */
.shell{
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.grid{
  display: grid;
  gap: var(--gap);
}

.grid-12{
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.eyebrow{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.eyebrow::before{
  content: "";
  width: 22px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 6. 基础组件 ---------- */
.card{
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, rgba(15, 29, 51, .96), rgba(10, 20, 38, .96));
  overflow: hidden;
}

.media-frame{
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background:
    radial-gradient(120% 90% at 18% 0%, rgba(53, 230, 208, .16), transparent 60%),
    radial-gradient(110% 90% at 92% 100%, rgba(139, 92, 255, .20), transparent 62%),
    linear-gradient(160deg, #0B1930, #050B18 72%);
}

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

.media-frame::after{
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    0deg,
    rgba(234, 242, 255, .05) 0 1px,
    transparent 1px 3px
  );
  opacity: .55;
}

.media-frame--wide{ aspect-ratio: 21 / 9; }
.media-frame--tall{ aspect-ratio: 4 / 5; }

.tag{
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 26px;
  padding: 3px 11px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(23, 41, 74, .5);
  color: var(--mute);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .06em;
  white-space: nowrap;
}

.tag--live{
  color: var(--green);
  border-color: rgba(59, 224, 138, .42);
  background: rgba(59, 224, 138, .10);
}

.tag--hold{
  color: var(--orange);
  border-color: rgba(255, 122, 47, .44);
  background: rgba(255, 122, 47, .10);
}

.tag--risk{
  color: var(--red);
  border-color: rgba(255, 61, 110, .44);
  background: rgba(255, 61, 110, .10);
}

.breadcrumbs{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 18px 0;
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--mute);
}

.breadcrumbs li{
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.breadcrumbs li + li::before{
  content: "/";
  color: rgba(169, 187, 214, .45);
}

.breadcrumbs a{
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  color: var(--mute);
  transition: color var(--dur) var(--ease);
}

.breadcrumbs a:hover{ color: var(--cyan); }
.breadcrumbs [aria-current="page"]{ color: var(--fog); }

/* ---------- 7. 按钮 ---------- */
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  white-space: nowrap;
  transition:
    transform var(--dur) var(--ease),
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.btn-accent{
  color: #1A0800;
  background: linear-gradient(100deg, #FF9A4D 0%, var(--orange) 52%, var(--red) 100%);
  box-shadow: 0 12px 30px -18px rgba(255, 61, 110, .95);
}

.btn-accent:hover{
  transform: translateY(-1px);
  box-shadow: 0 16px 34px -18px rgba(255, 122, 47, 1);
}

.btn-ghost{
  color: var(--fog);
  background: rgba(23, 41, 74, .42);
  border-color: var(--line);
}

.btn-ghost:hover{
  color: var(--cyan);
  border-color: rgba(53, 230, 208, .6);
}

/* ---------- 8. 头部 ---------- */
.site-header{
  position: sticky;
  top: 0;
  z-index: 100;
  isolation: isolate;
  background: rgba(10, 20, 38, .86);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.site-header::after{
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  pointer-events: none;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(53, 230, 208, .55) 18%,
    rgba(139, 92, 255, .55) 62%,
    transparent 100%
  );
}

.site-header[data-scrolled="true"]{
  background: rgba(8, 16, 30, .96);
  box-shadow: 0 20px 44px -32px rgba(0, 0, 0, .95);
}

.site-header[data-open="true"]{
  background: rgba(8, 16, 30, .98);
}

.scroll-rail{
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--violet) 55%, var(--orange) 100%);
  pointer-events: none;
  transition: transform 120ms linear;
}

.header-inner{
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 22px);
  min-height: var(--header-h);
}

.skip-link{
  position: absolute;
  left: 12px;
  top: 8px;
  z-index: 200;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  background: var(--cyan);
  color: #04121C;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .04em;
  transform: translateY(-180%);
  transition: transform var(--dur) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible{
  transform: translateY(0);
  outline: 2px solid var(--fog);
  outline-offset: 2px;
}

/* 品牌锁标 */
.brand{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  min-height: 44px;
}

.brand-mark{
  position: relative;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background: conic-gradient(from 210deg, var(--cyan), var(--violet), var(--orange), var(--cyan));
  box-shadow: inset 0 0 0 1px rgba(234, 242, 255, .16);
}

.brand-mark-core{
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink);
  box-shadow: 0 0 0 2px rgba(5, 11, 24, .92);
}

.brand-text{
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand-name{
  font-size: 15px;
  font-weight: 900;
  letter-spacing: .02em;
  color: var(--fog);
}

.brand-latin{
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--mute);
}

/* 工具条提示 */
.header-note{
  display: none;
  align-items: center;
  gap: 9px;
  margin-left: clamp(6px, 1.6vw, 24px);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mute);
  white-space: nowrap;
  max-width: none;
}

.header-note-dot{
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(59, 224, 138, .16);
  flex: 0 0 auto;
}

/* 主导航 */
.primary-nav{
  margin-left: auto;
}

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

.nav-item{ display: block; }

.nav-link{
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  min-height: 44px;
  padding: 12px clamp(8px, 1.1vw, 14px);
  border-radius: var(--radius-pill);
  color: var(--mute);
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.nav-index{
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .08em;
  color: rgba(169, 187, 214, .5);
  transition: color var(--dur) var(--ease);
}

.nav-label{
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .03em;
}

.nav-link:hover{ color: var(--fog); }
.nav-link:hover .nav-index{ color: var(--cyan); }

.nav-link:focus-visible{
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.nav-link[aria-current="page"]{ color: var(--fog); }
.nav-link[aria-current="page"] .nav-index{ color: var(--cyan); }

.nav-link[aria-current="page"]::after{
  content: "";
  position: absolute;
  left: clamp(8px, 1.1vw, 14px);
  right: clamp(8px, 1.1vw, 14px);
  bottom: 6px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
}

/* 头部动作区 */
.header-actions{
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: clamp(4px, 1vw, 16px);
}

.header-cta{ display: none; }

.nav-toggle{
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 10px 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(23, 41, 74, .45);
  color: var(--fog);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .06em;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.nav-toggle:hover{
  border-color: rgba(53, 230, 208, .55);
  color: var(--cyan);
}

.nav-toggle-text{ line-height: 1; }

.nav-toggle-icon{
  display: block;
  width: 18px;
  flex: 0 0 auto;
}

.nav-toggle-bar{
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease);
}

.nav-toggle-bar + .nav-toggle-bar{ margin-top: 5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){
  transform: translateY(3.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){
  transform: translateY(-3.5px) rotate(-45deg);
}

/* ---------- 9. 页脚 ---------- */
.site-footer{
  position: relative;
  z-index: 1;
  margin-top: clamp(56px, 9vw, 112px);
  padding: clamp(40px, 6vw, 72px) 0 28px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(10, 20, 38, .40) 0%, rgba(5, 11, 24, .96) 46%);
}

.footer-inner{
  display: block;
}

.footer-grid{
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  grid-template-columns: minmax(0, 1fr);
}

.footer-brand-line{
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 900;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--fog);
  max-width: 22ch;
}

.footer-tagline{
  margin-top: 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mute);
  max-width: 34ch;
}

.footer-status{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: rgba(169, 187, 214, .85);
  max-width: none;
}

.footer-status-dot{
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(59, 224, 138, .14);
  flex: 0 0 auto;
}

.footer-cta{ margin-top: 22px; }

.footer-col-title{
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-col-title::after{
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, rgba(53, 230, 208, .38), transparent);
}

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

.footer-link{
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  font-size: 14px;
  color: var(--mute);
  transition: color var(--dur) var(--ease);
}

.footer-link::before{
  content: "";
  width: 0;
  height: 1px;
  margin-right: 0;
  background: var(--cyan);
  transition: width var(--dur) var(--ease), margin-right var(--dur) var(--ease);
}

.footer-link:hover{ color: var(--fog); }

.footer-link:hover::before{
  width: 14px;
  margin-right: 8px;
}

.footer-contact{ min-width: 0; }

.footer-contact-line{
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--fog);
  min-width: 0;
}

.footer-contact-key{
  flex: 0 0 auto;
  min-width: 34px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: rgba(169, 187, 214, .7);
}

.footer-contact-value{
  min-width: 0;
  word-break: break-word;
}

.footer-meta{
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 28px;
  margin-top: clamp(32px, 5vw, 56px);
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--mute);
}

.footer-note{
  max-width: 62ch;
  line-height: 1.65;
  color: rgba(169, 187, 214, .82);
}

.footer-legal{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: rgba(169, 187, 214, .78);
  max-width: none;
}

/* ---------- 10. 显现动画 ---------- */
.js [data-reveal]{
  opacity: 0;
  transform: translateY(12px);
}

.js [data-reveal].is-visible{
  opacity: 1;
  transform: none;
  transition: opacity 340ms var(--ease), transform 340ms var(--ease);
}

/* ---------- 11. 响应式 ---------- */
@media (min-width: 720px){
  .footer-grid{ grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand{ grid-column: 1 / -1; }
}

@media (min-width: 900px){
  .header-cta{ display: inline-flex; }

  .nav-toggle{ display: none; }

  .footer-grid{
    grid-template-columns:
      minmax(0, 1.55fr)
      minmax(0, .8fr)
      minmax(0, .9fr)
      minmax(0, 1.2fr);
    gap: clamp(24px, 3vw, 48px);
  }

  .footer-brand{ grid-column: auto; }
}

@media (max-width: 899px){
  .primary-nav{
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-left: 0;
    display: none;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    padding: 10px var(--pad-x) 22px;
    background: rgba(8, 16, 30, .99);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 26px 48px -34px rgba(0, 0, 0, .95);
  }

  .site-header[data-open="true"] .primary-nav{ display: block; }

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

  .nav-link{
    width: 100%;
    justify-content: flex-start;
    padding: 13px 14px;
    border-radius: var(--radius-md);
    color: var(--fog);
  }

  .nav-link[aria-current="page"]{
    background: rgba(53, 230, 208, .10);
  }

  .nav-link[aria-current="page"]::after{ display: none; }

  .header-note{ display: none; }

  .grid-12{ grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

@media (max-width: 599px){
  .nav-toggle-text{ display: none; }

  .nav-toggle{ padding: 10px 13px; }

  .grid-12{ grid-template-columns: repeat(2, minmax(0, 1fr)); }

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

@media (min-width: 1100px){
  .header-note{ display: inline-flex; }
}

/* ---------- 12. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce){
  *,
  *::before,
  *::after{
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .js [data-reveal]{
    opacity: 1 !important;
    transform: none !important;
  }

  .scroll-rail{ transition: none; }

  .nav-link[aria-current="page"]::after{ transition: none; }
}