/* =========================================================
   九龙体育 · 全站共享样式 /assets/site.css
   高原夜空深蓝 + 九龙金锚点 + 粗野主义硬阴影
   ========================================================= */

/* ---------- 1. 设计变量 ---------- */
:root{
  --bg-void:#050B1A;      /* 碳黑：边框 / 硬阴影 */
  --bg:#0A1633;           /* 高原夜空深蓝：主背景 */
  --bg-card:#10224A;      /* 赛匣蓝：卡片次级底 */
  --snow:#F4F7FF;         /* 雪山白：正文 */
  --gold:#E8B33C;         /* 九龙金：唯一强锚点 */
  --gold-dark:#A9781F;    /* 暗金龙纹：下压态 */
  --green:#4FA97A;        /* 青稞绿：状态标签 */
  --red:#D9544F;          /* 玛尼红：状态标签 */
  --mute:#8FA0C4;         /* 星尘蓝灰：次级说明 */
  --cyan:#2FA8B8;         /* 经幡青：第二数据序列 */

  --line:rgba(143,160,196,.22);
  --line-strong:rgba(143,160,196,.42);

  --font-heading:"Arial Narrow","Helvetica Neue","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --shell:1240px;
  --shadow-hard:6px 6px 0 var(--bg-void);
  --shadow-hard-sm:4px 4px 0 var(--bg-void);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:120px}
body{
  margin:0;
  min-height:100vh;
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  color:var(--snow);
  background-color:var(--bg);
  background-image:
    radial-gradient(1100px 620px at 82% -12%,rgba(232,179,60,.10),transparent 60%),
    radial-gradient(900px 540px at 3% 6%,rgba(47,168,184,.09),transparent 62%),
    repeating-linear-gradient(118deg,rgba(143,160,196,.055) 0 1px,transparent 1px 26px);
  background-attachment:fixed;
}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
a{color:var(--snow);text-decoration-thickness:1px;text-underline-offset:3px}
a:hover{color:var(--gold)}
:focus-visible{outline:3px solid var(--cyan);outline-offset:3px;border-radius:2px}

/* ---------- 3. 中文排版与标题 ---------- */
h1,h2,h3,h4,h5,h6{
  margin:0;
  font-family:var(--font-heading);
  font-weight:700;
  letter-spacing:.08em;
  line-height:1.26;
  color:var(--snow);
}
h1{font-size:clamp(30px,4.6vw,44px)}
h2{font-size:clamp(24px,3.2vw,32px)}
h3{font-size:clamp(20px,2.4vw,24px)}
h4{font-size:clamp(18px,2vw,20px)}
p{margin:0 0 1.1em}
p:last-child{margin-bottom:0}
strong{color:var(--gold);font-weight:700}

/* ---------- 4. 布局与内容容器 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:clamp(16px,3vw,34px);
}
#main-content{padding-top:clamp(84px,9vw,106px)}

.prose{max-width:68ch;color:rgba(244,247,255,.88)}
.prose h2,.prose h3{margin-top:1.6em}
.prose h2:first-child,.prose h3:first-child{margin-top:0}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.3em}
.prose li{margin-bottom:.5em}

.grid{display:grid;gap:clamp(16px,2.2vw,28px)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.split-7-5{grid-template-columns:7fr 5fr}
.split-5-7{grid-template-columns:5fr 7fr}

/* ---------- 5. 索引 / 标题 / 分隔装饰 ---------- */
.index-tag{
  display:inline-block;
  padding:3px 9px;
  border:1px solid rgba(47,168,184,.45);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
  background:rgba(47,168,184,.08);
}
.section-title{margin:0 0 14px}
.section-title .mark{color:var(--gold)}
.ornament{
  font-family:var(--font-mono);
  color:var(--gold);
  letter-spacing:.12em;
  opacity:.9;
}
.divider{
  height:2px;border:0;margin:34px 0;
  background:linear-gradient(90deg,var(--gold),rgba(232,179,60,0));
}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}

/* ---------- 6. 状态标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  border:1px solid currentColor;
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  text-transform:uppercase;
  line-height:1.5;
}
.tag-gold{color:var(--gold);background:rgba(232,179,60,.12)}
.tag-green{color:var(--green);background:rgba(79,169,122,.13)}
.tag-red{color:var(--red);background:rgba(217,84,79,.13)}
.tag-cyan{color:var(--cyan);background:rgba(47,168,184,.13)}

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 22px;
  border:2px solid var(--bg-void);
  border-radius:2px;
  font-family:var(--font-heading);
  font-size:15px;
  font-weight:700;
  letter-spacing:.1em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:transform .18s var(--ease),box-shadow .18s var(--ease),background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn-gold{background:var(--gold);color:var(--bg-void);box-shadow:var(--shadow-hard-sm)}
.btn-gold:hover{background:#F2C558;color:var(--bg-void);transform:translate(-2px,-2px);box-shadow:var(--shadow-hard)}
.btn-gold:active{background:var(--gold-dark);transform:translate(2px,2px);box-shadow:1px 1px 0 var(--bg-void)}
.btn-ghost{background:transparent;color:var(--snow);border-color:var(--line-strong);box-shadow:var(--shadow-hard-sm)}
.btn-ghost:hover{color:var(--gold);border-color:var(--gold);transform:translate(-2px,-2px);box-shadow:var(--shadow-hard)}
.btn-sm{padding:9px 16px;font-size:13px;letter-spacing:.08em;border-radius:999px}

/* ---------- 8. 卡片 ---------- */
.card{
  position:relative;
  padding:clamp(18px,2.4vw,26px);
  background:var(--bg-card);
  border:2px solid var(--bg-void);
  border-radius:4px;
  box-shadow:var(--shadow-hard-sm);
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),border-color .25s var(--ease);
}
.card:hover,.card:focus-within{
  transform:translate(-3px,-3px);
  border-color:var(--gold);
  box-shadow:var(--shadow-hard);
}

/* ---------- 9. 图片占位容器（页面阶段复用） ---------- */
.media-frame{
  position:relative;
  isolation:isolate;
  aspect-ratio:16/9;
  overflow:hidden;
  border:2px solid var(--bg-void);
  border-radius:4px;
  background:linear-gradient(152deg,#10224A 0%,#0A1633 62%,#050B1A 100%);
  box-shadow:var(--shadow-hard-sm);
}
.media-frame img,.media-frame svg{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";
  position:absolute;inset:0;
  background:
    repeating-linear-gradient(118deg,rgba(244,247,255,.055) 0 1px,transparent 1px 15px),
    linear-gradient(180deg,rgba(232,179,60,.10),transparent 48%);
  pointer-events:none;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0 0 22px;
  padding:0;
  list-style:none;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  text-transform:uppercase;
  color:var(--mute);
}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"།";color:var(--gold);opacity:.75}
.breadcrumb a{color:var(--mute);text-decoration:none}
.breadcrumb a:hover{color:var(--gold)}

/* ---------- 11. 显现动画协议 ---------- */
.has-js [data-reveal]{
  opacity:0;
  transform:translateY(20px);
  transition:opacity .55s var(--ease),transform .55s var(--ease);
}
.has-js [data-reveal].is-visible{opacity:1;transform:none}

/* =========================================================
   12. 页头：悬浮胶囊浮岛
   ========================================================= */
.skip-link{
  position:absolute;
  left:-9999px;
  top:0;
  z-index:200;
  padding:12px 20px;
  background:var(--gold);
  color:var(--bg-void);
  border:2px solid var(--bg-void);
  font-family:var(--font-heading);
  font-weight:700;
  letter-spacing:.1em;
  text-decoration:none;
}
.skip-link:focus{left:14px;top:14px;color:var(--bg-void)}

.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:90;
  padding:clamp(12px,1.8vw,20px) clamp(12px,2.4vw,32px);
  transition:padding .32s var(--ease);
}
.site-header.is-compact{padding-top:8px;padding-bottom:8px}

.scroll-progress{
  position:fixed;
  top:0;left:0;right:0;
  height:3px;
  background:rgba(143,160,196,.16);
  pointer-events:none;
  z-index:95;
}
.scroll-progress__bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--cyan),var(--gold));
  transition:width .12s linear;
}

.nav-island{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(10px,1.6vw,22px);
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding:10px 12px 10px 18px;
  background:rgba(10,22,51,.88);
  border:2px solid rgba(232,179,60,.28);
  border-radius:999px;
  box-shadow:0 6px 0 rgba(5,11,26,.85),inset 0 0 0 1px rgba(143,160,196,.12);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  transition:padding .32s var(--ease),background-color .3s var(--ease),border-color .3s var(--ease);
}
.site-header.is-compact .nav-island{padding:6px 10px 6px 14px;background:rgba(10,22,51,.96)}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
  text-decoration:none;
  color:var(--snow);
}
.brand-mark{
  font-size:20px;
  line-height:1;
  color:var(--gold);
  text-shadow:0 0 14px rgba(232,179,60,.55);
}
.brand-text{display:block}
.brand-name{
  display:block;
  font-family:var(--font-heading);
  font-size:19px;
  font-weight:700;
  letter-spacing:.16em;
  line-height:1.15;
  color:var(--snow);
}
.brand-sub{
  display:block;
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.26em;
  line-height:1.3;
  color:var(--mute);
}
.site-header.is-compact .brand-sub{display:none}

/* 主导航 */
.primary-nav{margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px;margin:0;padding:0;list-style:none}
.nav-link{
  display:block;
  padding:8px 13px;
  border:1px solid transparent;
  border-radius:999px;
  font-size:14.5px;
  letter-spacing:.06em;
  white-space:nowrap;
  text-decoration:none;
  color:var(--snow);
  transition:color .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease);
}
.nav-link:hover{color:var(--gold);background:rgba(232,179,60,.10);border-color:rgba(232,179,60,.42)}
.nav-link[aria-current="page"]{
  color:var(--bg-void);
  background:var(--gold);
  border-color:var(--gold-dark);
  font-weight:700;
  box-shadow:0 2px 0 var(--bg-void);
}
.nav-link[aria-current="page"]:hover{color:var(--bg-void);background:#F2C558}

/* 右侧操作区 */
.header-actions{display:flex;align-items:center;gap:10px;margin-left:auto;flex:0 0 auto}

/* 汉堡按钮 */
.nav-toggle{
  display:none;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:4px;
  width:44px;height:44px;
  padding:0;
  background:var(--bg-card);
  color:var(--snow);
  border:2px solid var(--bg-void);
  border-radius:999px;
  box-shadow:2px 2px 0 var(--bg-void);
  cursor:pointer;
}
.nav-toggle-bar{
  display:block;
  width:18px;height:2px;
  background:currentColor;
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}
.site-header[data-open] .nav-toggle{color:var(--gold);border-color:var(--gold)}
.site-header[data-open] .nav-toggle-bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bar:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle-bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* =========================================================
   13. 页脚
   ========================================================= */
.site-footer{
  position:relative;
  margin-top:clamp(52px,7vw,96px);
  background:var(--bg-void);
  border-top:2px solid rgba(232,179,60,.35);
  color:var(--snow);
}
.footer-rail{
  background:linear-gradient(90deg,rgba(232,179,60,.18),rgba(232,179,60,.03) 70%,transparent);
  border-bottom:1px solid rgba(232,179,60,.32);
}
.footer-rail__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px 20px;
  padding-block:16px;
}
.footer-rail__text{
  margin:0;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.08em;
  color:var(--gold);
}

.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.35fr;
  gap:clamp(22px,3vw,44px);
  padding-block:clamp(34px,5vw,62px);
}
.footer-brand .brand{margin-bottom:16px}
.footer-note{
  max-width:34ch;
  margin:0 0 16px;
  font-size:14.5px;
  line-height:1.8;
  color:var(--mute);
}
.footer-col-title{
  display:flex;
  align-items:center;
  gap:8px;
  margin:0 0 16px;
  font-family:var(--font-heading);
  font-size:14px;
  font-weight:700;
  letter-spacing:.2em;
  color:var(--mute);
}
.footer-col-title::before{content:"།";color:var(--gold);font-family:var(--font-mono);opacity:.85}
.footer-links{display:grid;gap:10px;margin:0;padding:0;list-style:none}
.footer-links a{
  display:inline-block;
  font-size:15px;
  text-decoration:none;
  color:rgba(244,247,255,.86);
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.footer-links a:hover{color:var(--gold);transform:translateX(4px)}

.footer-contact{display:grid;gap:13px;margin:0;padding:0;list-style:none}
.footer-contact li{display:grid;gap:3px}
.footer-contact .k{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.footer-contact .v{font-size:14.5px;line-height:1.7;color:rgba(244,247,255,.9);word-break:break-word}

.footer-legal{border-top:1px solid var(--line)}
.footer-legal__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 22px;
  padding-block:18px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--mute);
}
.footer-legal__copy{margin:0}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:8px 18px;margin:0;padding:0;list-style:none}
.footer-legal__links a{color:var(--mute);text-decoration:none}
.footer-legal__links a:hover{color:var(--gold)}

/* 返回顶部 */
.to-top{
  position:fixed;
  right:clamp(14px,2.4vw,28px);
  bottom:clamp(14px,2.4vw,28px);
  z-index:70;
  display:grid;
  place-items:center;
  width:48px;height:48px;
  padding:0;
  font-size:18px;
  line-height:1;
  color:var(--gold);
  background:var(--bg-card);
  border:2px solid var(--gold);
  border-radius:999px;
  box-shadow:var(--shadow-hard-sm);
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity .25s var(--ease),transform .25s var(--ease),visibility .25s,background-color .2s var(--ease),color .2s var(--ease);
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--gold);color:var(--bg-void)}

/* =========================================================
   14. 响应式：平板与移动端
   ========================================================= */
@media (max-width:1180px){
  .nav-link{padding:8px 10px;font-size:14px}
}

@media (max-width:1020px){
  .nav-toggle{display:flex}
  .header-actions .btn-gold{padding:8px 14px;font-size:12.5px;letter-spacing:.06em}

  .primary-nav{
    position:absolute;
    left:0;
    right:0;
    top:calc(100% + 12px);
    display:none;
    margin-left:0;
    padding:10px;
    background:var(--bg-card);
    border:2px solid var(--bg-void);
    border-radius:8px;
    box-shadow:var(--shadow-hard);
  }
  .site-header[data-open] .primary-nav{
    display:block;
    animation:navDrop .24s var(--ease) both;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:4px}
  .nav-link{padding:12px 14px;border-radius:4px;font-size:16px;letter-spacing:.08em;border-color:transparent}
  .nav-link[aria-current="page"]{box-shadow:none}
}

@keyframes navDrop{
  from{opacity:0;transform:translateY(-8px)}
  to{opacity:1;transform:none}
}

@media (max-width:900px){
  .grid-2,.grid-3,.split-7-5,.split-5-7{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}

@media (max-width:620px){
  body{font-size:16px}
  :root{--shadow-hard:5px 5px 0 var(--bg-void);--shadow-hard-sm:3px 3px 0 var(--bg-void)}
  .brand-sub{display:none}
  .brand-name{font-size:17px;letter-spacing:.12em}
  .nav-island{padding:8px 10px 8px 14px}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .footer-rail__inner{flex-direction:column;align-items:flex-start}
  .footer-legal__inner{flex-direction:column;align-items:flex-start}
  .btn{width:auto}
  #main-content{padding-top:80px}
}

@media (max-width:400px){
  .header-actions .btn-gold{padding:7px 11px;font-size:11.5px;letter-spacing:.04em}
}

/* =========================================================
   15. 动效偏好
   ========================================================= */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
  .scroll-progress__bar{transition:none}
}