/* =========================================================
   九博体育CN官网 · 全站共享样式
   ========================================================= */

:root{
  --clr-primary: #1B3B6F;
  --clr-primary-light: #2F5CA3;
  --clr-bg: #0B0E14;
  --clr-panel: #131A26;
  --clr-white: #FFFFFF;
  --clr-muted: #9BA3B4;
  --clr-accent: #39FF14;
  --clr-warning: #FF4D00;
  --clr-line: #2A3441;
  --font-headline: "Arial Black", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "Roboto Mono", "Courier New", monospace;
  --container-w: 1280px;
  --shadow-header: 0 8px 24px rgba(0,0,0,0.45);
}

/* ---------- Reset ---------- */

*, *::before, *::after{
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body{
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--clr-white);
  background-color: var(--clr-bg);
  background-image: radial-gradient(circle, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 28px 28px;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a{
  color: inherit;
  text-decoration: none;
  transition: color .2s ease-out, background-color .2s ease-out, border-color .2s ease-out;
}

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

ul, ol{
  list-style: none;
}

/* ---------- 基础排版 ---------- */

h1, h2, h3, h4{
  font-family: var(--font-headline);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--clr-white);
}

h1{
  font-size: clamp(28px, 4vw, 36px);
}

h2{
  font-size: clamp(20px, 3vw, 24px);
}

h3{
  font-size: 18px;
}

h4{
  font-size: 16px;
}

.display-title{
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--clr-white);
}

.display-sub{
  font-size: clamp(16px, 2vw, 20px);
  color: var(--clr-muted);
  line-height: 1.7;
}

.prose p + p{
  margin-top: 1em;
}

.prose ul{
  margin: 12px 0;
  padding-left: 20px;
  list-style: disc;
}

.prose li{
  margin-bottom: 6px;
}

code{
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: rgba(27,59,111,0.2);
  padding: 2px 6px;
  border: 1px solid var(--clr-line);
}

blockquote{
  margin: 24px 0;
  padding: 16px 20px;
  border-left: 3px solid var(--clr-primary);
  background: var(--clr-panel);
  color: var(--clr-muted);
  font-size: 15px;
}

/* ---------- 布局容器 ---------- */

.container{
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
}

.section-block{
  padding: 64px 0;
}

.content-main{
  padding: 48px 0 64px;
}

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

/* ---------- 跳过链接与滚动进度 ---------- */

.skip-link{
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--clr-primary);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: 2px;
  transform: translateY(-150%);
  transition: transform .2s ease-out;
}

.skip-link:focus-visible{
  transform: translateY(0);
  outline: none;
  box-shadow: 0 0 0 3px var(--clr-accent);
}

.scroll-progress{
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--clr-accent);
  box-shadow: 0 0 12px rgba(57,255,20,0.7);
  z-index: 150;
  pointer-events: none;
}

/* ---------- 头部 ---------- */

.site-header{
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--clr-bg);
  border-bottom: 1px solid var(--clr-line);
}

.header-ticker{
  background: var(--clr-bg);
  border-bottom: 1px solid var(--clr-line);
}

.header-ticker-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 36px;
  gap: 16px;
}

.header-ticker-text{
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--clr-muted);
  white-space: nowrap;
  overflow: hidden;
}

.ticker-status{
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--clr-accent);
  box-shadow: 0 0 8px rgba(57,255,20,0.8);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse{
  0%, 100%{
    opacity: 1;
    transform: scale(1);
  }
  50%{
    opacity: 0.5;
    transform: scale(0.8);
  }
}

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

.header-version{
  flex: 0 0 auto;
  padding: 2px 8px;
  background: rgba(255,77,0,0.15);
  border: 1px solid rgba(255,77,0,0.5);
  color: var(--clr-warning);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
}

.header-command{
  background: rgba(13,17,26,0.98);
}

.header-command-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 20px;
}

.header-brand{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.brand-mark{
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  background: var(--clr-primary);
  color: #fff;
  font-family: var(--font-headline);
  font-size: 18px;
  font-weight: 900;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
}

.brand-name{
  font-family: var(--font-headline);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--clr-white);
}

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

.header-nav-link{
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 14px;
  font-size: 14px;
  font-weight: 600;
  color: var(--clr-muted);
  border: 1px solid transparent;
  transition: color .2s ease-out, background-color .2s ease-out;
}

.header-nav-link:hover,
.header-nav-link:focus-visible{
  color: var(--clr-white);
  background: rgba(27,59,111,0.25);
}

.header-nav-link:hover .nav-index,
.header-nav-link:focus-visible .nav-index{
  color: var(--clr-accent);
}

.nav-index{
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--clr-muted);
  letter-spacing: 0.04em;
  transition: color .2s ease-out;
}

.nav-label{
  line-height: 1;
  white-space: nowrap;
}

.header-nav-link[aria-current="page"]{
  color: var(--clr-white);
  background: rgba(27,59,111,0.45);
  border-color: rgba(27,59,111,0.8);
  clip-path: polygon(6px 0, 100% 0, calc(100% - 6px) 100%, 0 100%);
}

.header-nav-link[aria-current="page"] .nav-index{
  color: var(--clr-accent);
  font-weight: 700;
}

.header-nav-link[aria-current="page"]::after{
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 2px;
  background: var(--clr-accent);
  opacity: 0.85;
}

.nav-overlay{
  display: none;
}

.header-mobile-toggle{
  display: none;
  position: relative;
  z-index: 92;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  border: 1px solid var(--clr-line);
  transition: border-color .2s ease-out;
}

.header-mobile-toggle:hover,
.header-mobile-toggle:focus-visible{
  border-color: var(--clr-primary);
}

.toggle-bar{
  display: block;
  width: 18px;
  height: 2px;
  background: var(--clr-white);
  transition: transform .25s ease-out, opacity .25s ease-out;
}

/* ---------- 页脚 ---------- */

.site-footer{
  position: relative;
  margin-top: 80px;
  background-color: #070A10;
  background-image:
    radial-gradient(ellipse 80% 60% at 85% 0%, rgba(27,59,111,0.25), transparent 60%),
    radial-gradient(circle, rgba(255,255,255,0.03) 1px, transparent 1px);
  background-size: auto, 28px 28px;
  border-top: 1px solid var(--clr-line);
}

.site-footer::before{
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--clr-primary) 0%, var(--clr-primary) 60%, transparent 100%);
}

.footer-grid{
  display: grid;
  grid-template-columns: 1.3fr 0.9fr 0.9fr 1.1fr;
  gap: 40px;
  padding: 56px 0 40px;
}

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

.footer-brand{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}

.footer-brand-mark{
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  background: var(--clr-primary);
  color: #fff;
  font-family: var(--font-headline);
  font-size: 18px;
  font-weight: 900;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
}

.footer-brand-name{
  font-family: var(--font-headline);
  font-size: 16px;
  font-weight: 800;
  color: var(--clr-white);
}

.footer-trust{
  font-size: 14px;
  line-height: 1.8;
  color: var(--clr-muted);
  margin-bottom: 12px;
  max-width: 420px;
}

.footer-note{
  font-size: 12px;
  font-family: var(--font-mono);
  color: var(--clr-muted);
  opacity: 0.8;
  border-left: 2px solid var(--clr-primary);
  padding-left: 10px;
}

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

.footer-title{
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--clr-muted);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--clr-line);
  width: 100%;
}

.footer-list{
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-list a{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--clr-muted);
  font-size: 14px;
  transition: color .2s ease-out;
}

.footer-list a::before{
  content: "";
  width: 10px;
  height: 2px;
  background: transparent;
  flex: 0 0 auto;
  transition: background-color .2s ease-out;
}

.footer-list a:hover,
.footer-list a:focus-visible{
  color: var(--clr-white);
}

.footer-list a:hover::before,
.footer-list a:focus-visible::before{
  background: var(--clr-accent);
}

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

.footer-contact-list{
  gap: 12px;
}

.footer-contact-list li{
  display: flex;
  align-items: flex-start;
  gap: 8px;
  color: var(--clr-muted);
  font-size: 14px;
  line-height: 1.7;
}

.footer-contact-label{
  display: inline-block;
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--clr-primary-light);
  background: rgba(27,59,111,0.2);
  padding: 1px 6px;
  margin-top: 3px;
  clip-path: polygon(4px 0, 100% 0, calc(100% - 4px) 100%, 0 100%);
}

.footer-bottom-bar{
  border-top: 1px solid var(--clr-line);
  background: rgba(0,0,0,0.35);
}

.footer-bottom{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 24px;
}

.footer-copyright{
  font-size: 13px;
  color: var(--clr-muted);
}

.footer-icp{
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--clr-muted);
}

.footer-version{
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--clr-muted);
  border: 1px solid var(--clr-line);
  padding: 2px 8px;
  letter-spacing: 0.08em;
}

/* ---------- 通用组件 ---------- */

.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1;
  border: 1px solid transparent;
  transition: transform .2s ease-out, background-color .2s ease-out, color .2s ease-out, border-color .2s ease-out;
}

.btn-primary{
  background: var(--clr-primary);
  color: var(--clr-white);
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.btn-primary:hover,
.btn-primary:focus-visible{
  background: #244C8F;
  transform: translateY(-1px);
  filter: drop-shadow(0 6px 14px rgba(27,59,111,0.5));
}

.btn-ghost{
  background: transparent;
  color: var(--clr-white);
  border-color: var(--clr-line);
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.btn-ghost:hover,
.btn-ghost:focus-visible{
  border-color: var(--clr-primary);
  transform: translateY(-1px);
}

.tag-topic{
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  background: var(--clr-panel);
  border: 1px solid var(--clr-line);
  color: var(--clr-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  transition: background-color .2s ease-out, color .2s ease-out, border-color .2s ease-out;
}

.tag-topic::before{
  content: "";
  width: 5px;
  height: 5px;
  background: var(--clr-primary-light);
  flex: 0 0 auto;
  transition: background-color .2s ease-out;
}

.tag-topic:hover,
.tag-topic:focus-visible{
  color: var(--clr-white);
  border-color: var(--clr-primary);
}

.tag-topic[aria-pressed="true"]{
  background: var(--clr-primary);
  color: var(--clr-white);
  border-color: var(--clr-primary);
}

.tag-topic[aria-pressed="true"]::before{
  background: var(--clr-accent);
}

.clip-panel{
  position: relative;
  background: var(--clr-panel);
  border: 1px solid var(--clr-line);
  clip-path: polygon(16px 0, 100% 0, calc(100% - 16px) 100%, 0 100%);
  padding: 28px;
  transition: border-color .2s ease-out;
}

.clip-panel:hover{
  border-color: rgba(27,59,111,0.7);
}

.breadcrumb{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--clr-muted);
  margin-bottom: 24px;
  padding: 10px 0;
  border-bottom: 1px solid var(--clr-line);
}

.breadcrumb .sep{
  color: var(--clr-primary-light);
}

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

.breadcrumb a:hover,
.breadcrumb a:focus-visible{
  color: var(--clr-white);
}

/* ---------- 章节索引 ---------- */

.chapter-index{
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 20px;
}

.chapter-index-num{
  font-family: var(--font-mono);
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 900;
  line-height: 1;
  color: var(--clr-primary-light);
  letter-spacing: -0.02em;
}

.chapter-index-bar{
  flex: 0 0 auto;
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, var(--clr-primary), transparent);
}

.chapter-index-title{
  font-family: var(--font-headline);
  font-size: 24px;
  font-weight: 800;
  color: var(--clr-white);
}

/* ---------- 图片容器 ---------- */

.img-frame{
  position: relative;
  overflow: hidden;
  background: var(--clr-panel);
  border: 1px solid var(--clr-line);
}

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

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

.img-frame-1-1{
  aspect-ratio: 1 / 1;
}

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

.img-frame[data-caption]::after{
  content: attr(data-caption);
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 4px 10px;
  background: rgba(11,14,20,0.82);
  color: var(--clr-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  border-top: 2px solid var(--clr-primary);
}

.img-frame-placeholder{
  display: grid;
  place-items: center;
  min-height: 220px;
  background-image:
    linear-gradient(135deg, rgba(27,59,111,0.25), transparent 50%),
    radial-gradient(circle, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: auto, 20px 20px;
  color: var(--clr-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-align: center;
  padding: 24px;
}

/* ---------- 分隔线 ---------- */

.divider-diagonal{
  position: relative;
  height: 2px;
  background: linear-gradient(90deg, var(--clr-primary) 0%, transparent 85%);
}

.divider-diagonal::after{
  content: "";
  position: absolute;
  right: 0;
  top: -3px;
  width: 8px;
  height: 8px;
  background: var(--clr-accent);
  transform: rotate(45deg);
}

/* ---------- 栅格 ---------- */

.grid-feature{
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.grid-feature > .span-3{ grid-column: span 3; }
.grid-feature > .span-4{ grid-column: span 4; }
.grid-feature > .span-5{ grid-column: span 5; }
.grid-feature > .span-6{ grid-column: span 6; }
.grid-feature > .span-7{ grid-column: span 7; }
.grid-feature > .span-8{ grid-column: span 8; }
.grid-feature > .span-12{ grid-column: span 12; }

/* ---------- 滚动显现 ---------- */

.js [data-reveal]{
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .45s ease-out, transform .45s ease-out;
}

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

/* ---------- 焦点可见性 ---------- */

a:focus-visible,
button:focus-visible{
  outline: 2px solid var(--clr-accent);
  outline-offset: -2px;
}

/* ---------- 响应式 ---------- */

@media (max-width: 992px){
  .header-mobile-toggle{
    display: flex;
  }

  .header-nav{
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: min(340px, 86vw);
    z-index: 90;
    background: var(--clr-panel);
    border-left: 1px solid var(--clr-line);
    padding: 88px 24px 32px;
    transform: translateX(105%);
    transition: transform .35s ease-out;
    overflow-y: auto;
  }

  .site-header[data-open] .header-nav{
    transform: translateX(0);
  }

  .nav-overlay{
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    opacity: 0;
    visibility: hidden;
    transition: opacity .3s ease-out, visibility .3s;
    z-index: 85;
  }

  .nav-overlay.is-open{
    opacity: 1;
    visibility: visible;
  }

  .header-nav-list{
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .header-nav-link{
    padding: 14px 16px;
    font-size: 16px;
    border: 1px solid var(--clr-line);
    background: var(--clr-bg);
    clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
  }

  .header-nav-link[aria-current="page"]{
    border-color: var(--clr-primary);
  }

  .header-nav-link[aria-current="page"]::after{
    left: 16px;
    right: 16px;
    bottom: 6px;
  }

  .site-header[data-open] .toggle-bar:nth-child(1){
    transform: translateY(7px) rotate(45deg);
  }

  .site-header[data-open] .toggle-bar:nth-child(2){
    opacity: 0;
  }

  .site-header[data-open] .toggle-bar:nth-child(3){
    transform: translateY(-7px) rotate(-45deg);
  }

  .footer-grid{
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .grid-feature > [class*="span-"]{
    grid-column: span 6;
  }
}

@media (max-width: 640px){
  .container{
    padding: 0 16px;
  }

  .footer-bottom{
    padding: 18px 16px;
  }

  .footer-grid{
    grid-template-columns: 1fr;
    gap: 28px;
    padding: 40px 0 32px;
  }

  .grid-feature{
    gap: 16px;
  }

  .grid-feature > [class*="span-"]{
    grid-column: span 12;
  }

  .section-block{
    padding: 40px 0;
  }

  .clip-panel{
    padding: 20px;
  }

  .header-ticker-text{
    font-size: 11px;
  }

  .header-version{
    font-size: 10px;
  }

  .brand-name{
    font-size: 14px;
  }

  .brand-mark{
    width: 32px;
    height: 32px;
    font-size: 16px;
  }
}

/* ---------- 减少动态效果 ---------- */

@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;
  }

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