/* ============================================================
   德信赛场 /assets/site.css
   共享外壳：变量 · 排版 · 页头 · 页脚 · 通用组件
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root{
  --night:#0A1428;
  --panel:#132443;
  --glass:#1F3760;
  --gold:#F5C24A;
  --red:#E5484D;
  --green:#3FA796;
  --blue:#5B8DEF;
  --white:#F3F6FB;
  --muted:#95A3BD;
  --line:#26385C;
  --glow:#2A4B7C;

  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,monospace;

  --max:1320px;
  --gutter:clamp(16px,4vw,40px);
  --radius:14px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}

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

body{
  margin:0;
  background:var(--night);
  color:var(--white);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.85;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd,ul,ol{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg,video{max-width:100%;}
img{display:block;}
button{font:inherit;color:inherit;background:none;border:0;}

a{
  color:var(--blue);
  text-decoration:none;
  transition:color .2s var(--ease);
}
a:hover{color:var(--gold);}

::selection{background:var(--gold);color:var(--night);}

:focus-visible{
  outline:2px solid var(--gold);
  outline-offset:2px;
}

#main-content{scroll-margin-top:24px;}

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

/* ---------- 3. 中文排版 ---------- */
h1,.display{
  font-size:clamp(32px,5vw,64px);
  font-weight:900;
  line-height:1.05;
  letter-spacing:-.02em;
}
h2{
  font-size:clamp(22px,2.6vw,32px);
  font-weight:700;
  line-height:1.2;
  letter-spacing:-.01em;
}
h3{
  font-size:clamp(18px,2vw,22px);
  font-weight:700;
  line-height:1.3;
  letter-spacing:-.01em;
}
strong{font-weight:700;color:var(--white);}

.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  font-size:1.15em;
  letter-spacing:-.01em;
}

.eyebrow{
  display:inline-block;
  font-size:12px;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--gold);
  margin-bottom:14px;
}

/* ---------- 4. 容器与网格 ---------- */
.wrap{
  width:100%;
  max-width:var(--max);
  margin:0 auto;
  padding:0 var(--gutter);
}
.wrap--narrow{max-width:860px;}

.prose{
  max-width:68ch;
  font-size:16px;
  line-height:1.85;
}
.prose p + p{margin-top:1.85em;}
.prose h2{margin-top:1.6em;}
.prose h3{margin-top:1.4em;}

.grid-8{
  display:grid;
  grid-template-columns:repeat(8,minmax(0,1fr));
  gap:24px;
}
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:24px;
}

/* ---------- 5. 堆叠画板 ---------- */
.panel{
  position:relative;
  overflow:hidden;
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(20px,3vw,40px);
}
.panel::before{
  content:"";
  position:absolute;
  inset-inline-start:0;
  top:18px;
  bottom:18px;
  width:4px;
  border-radius:0 4px 4px 0;
  background:linear-gradient(180deg,var(--blue),var(--green));
}
.panel--glass{
  background:rgba(31,55,96,.42);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-color:rgba(91,141,239,.28);
}
.panel-head{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  justify-content:space-between;
  gap:10px 18px;
  margin-bottom:22px;
}
.panel-title{
  font-size:clamp(20px,2.4vw,28px);
  font-weight:700;
  line-height:1.25;
  letter-spacing:-.01em;
}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 26px;
  border:1px solid transparent;
  border-radius:999px;
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:transform .18s var(--ease),background .22s var(--ease),
             color .22s var(--ease),border-color .22s var(--ease);
}
.btn:hover{text-decoration:none;transform:translateY(-1px);}
.btn:active{transform:translateY(1px);}
.btn--primary{background:var(--gold);color:var(--night);}
.btn--primary:hover{background:#FFD166;color:var(--night);}
.btn--ghost{
  background:rgba(31,55,96,.55);
  color:var(--white);
  border-color:var(--line);
}
.btn--ghost:hover{border-color:var(--blue);color:var(--white);}

/* ---------- 7. 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 10px;
  border:1px solid currentColor;
  border-radius:999px;
  font-size:12px;
  font-weight:600;
  letter-spacing:.12em;
  line-height:1.7;
  white-space:nowrap;
}
.tag--gold{color:var(--gold);}
.tag--blue{color:var(--blue);}
.tag--red{color:var(--red);}
.tag--green{color:var(--green);}
.tag--solid{
  background:var(--gold);
  border-color:var(--gold);
  color:var(--night);
}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb{
  width:100%;
  max-width:var(--max);
  margin:0 auto;
  padding:28px var(--gutter) 0;
  font-size:13px;
  color:var(--muted);
}
.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
}
.breadcrumb li{
  display:inline-flex;
  align-items:center;
  gap:10px;
}
.breadcrumb li + li::before{
  content:"";
  width:4px;
  height:4px;
  border-radius:50%;
  background:var(--line);
}
.breadcrumb a{color:var(--muted);}
.breadcrumb a:hover{color:var(--gold);}
.breadcrumb [aria-current="page"]{color:var(--white);}

/* ---------- 9. 图片容器 ---------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  aspect-ratio:16 / 9;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:
    radial-gradient(85% 85% at 50% 8%,rgba(42,75,124,.62),rgba(10,20,40,0) 72%),
    var(--glass);
}
.media-frame > img,
.media-frame > picture,
.media-frame > svg{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame > svg{object-fit:contain;}
.media-frame figcaption{
  position:absolute;
  inset-inline:0;
  bottom:0;
  padding:28px 18px 14px;
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--white);
  background:linear-gradient(180deg,rgba(10,20,40,0),rgba(10,20,40,.86));
}
.media-frame--wide{aspect-ratio:21 / 9;}
.media-frame--banner{aspect-ratio:3 / 1;}
.media-frame--square{aspect-ratio:1 / 1;}
.media-frame--portrait{aspect-ratio:4 / 5;}

/* ---------- 10. 跳转链接 ---------- */
.skip-link{
  position:fixed;
  left:16px;
  top:0;
  z-index:300;
  transform:translateY(-130%);
  padding:12px 22px;
  border-radius:0 0 10px 10px;
  background:var(--gold);
  color:var(--night);
  font-size:14px;
  font-weight:700;
  letter-spacing:.04em;
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0);color:var(--night);}

/* ---------- 11. 滚动进度 ---------- */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  width:100%;
  height:3px;
  z-index:120;
  pointer-events:none;
  transform:scaleX(0);
  transform-origin:0 50%;
  will-change:transform;
  background:linear-gradient(90deg,var(--blue),var(--white),var(--red),var(--green),var(--gold));
}

/* ---------- 12. 经幡五色条 ---------- */
.flag-rule{
  display:flex;
  width:100%;
  height:4px;
  overflow:hidden;
}
.flag-rule > span{
  flex:1 1 0;
  height:100%;
}
.flag-rule > span:nth-child(1){background:var(--blue);}
.flag-rule > span:nth-child(2){background:var(--white);}
.flag-rule > span:nth-child(3){background:var(--red);}
.flag-rule > span:nth-child(4){background:var(--green);}
.flag-rule > span:nth-child(5){background:var(--gold);}

/* ---------- 13. 页头 ---------- */
.site-header{
  position:relative;
  z-index:50;
  padding:0 var(--gutter);
  border-bottom:1px solid var(--line);
  background:
    radial-gradient(112% 82% at 50% -30%,rgba(42,75,124,.78) 0%,rgba(10,20,40,0) 64%),
    var(--night);
}
.header-inner{
  max-width:var(--max);
  margin:0 auto;
}

.header-utility{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:16px 0 2px;
  font-size:12px;
  font-weight:600;
  letter-spacing:.14em;
  color:var(--muted);
}
.header-domain{
  font-family:var(--font-mono);
  letter-spacing:.08em;
}
.header-motto{
  display:inline-flex;
  align-items:center;
  gap:10px;
  color:var(--gold);
  letter-spacing:.1em;
}
.header-motto::before{
  content:"";
  width:24px;
  height:1px;
  background:currentColor;
  opacity:.75;
}

.masthead{
  position:relative;
  display:flex;
  align-items:center;
  justify-content:center;
  gap:16px;
  padding:2px 0 16px;
}
.brand{
  font-size:clamp(26px,4vw,44px);
  font-weight:900;
  line-height:1.05;
  letter-spacing:-.02em;
  color:var(--white);
}
.brand:hover{color:var(--white);}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  padding:10px 14px;
  border:1px solid var(--line);
  border-radius:10px;
  background:rgba(31,55,96,.55);
  color:var(--white);
  font-size:13px;
  font-weight:700;
  letter-spacing:.12em;
  cursor:pointer;
  transition:border-color .22s var(--ease),background .22s var(--ease);
}
.nav-toggle:hover{border-color:var(--blue);}
.nav-toggle-bars{
  position:relative;
  display:block;
  width:18px;
  height:2px;
  background:currentColor;
  transition:background .22s var(--ease);
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  background:currentColor;
  transition:transform .26s var(--ease);
}
.nav-toggle-bars::before{top:-6px;}
.nav-toggle-bars::after{top:6px;}
.site-header[data-open="true"] .nav-toggle-bars{background:transparent;}
.site-header[data-open="true"] .nav-toggle-bars::before{transform:translateY(6px) rotate(45deg);}
.site-header[data-open="true"] .nav-toggle-bars::after{transform:translateY(-6px) rotate(-45deg);}
.nav-toggle-label{line-height:1;}

.site-nav{padding:0 0 10px;}
.site-nav-list{
  display:flex;
  flex-wrap:wrap;
  justify-content:center;
  gap:4px clamp(14px,2.6vw,36px);
}
.site-nav-link{
  position:relative;
  display:inline-block;
  padding:12px 2px 15px;
  color:var(--white);
  font-size:15px;
  font-weight:600;
  letter-spacing:.04em;
  white-space:nowrap;
}
.site-nav-link::after{
  content:"";
  position:absolute;
  left:50%;
  bottom:6px;
  width:0;
  height:2px;
  background:var(--gold);
  transform:translateX(-50%);
  transition:width .24s var(--ease);
}
.site-nav-link:hover{color:var(--gold);}
.site-nav-link:hover::after,
.site-nav-link:focus-visible::after,
.site-nav-link[aria-current="page"]::after{width:100%;}
.site-nav-link[aria-current="page"]{color:var(--gold);}

/* ---------- 14. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:120px;
  background:
    radial-gradient(120% 90% at 50% 0%,rgba(42,75,124,.4) 0%,rgba(10,20,40,0) 60%),
    var(--panel);
}
.footer-flag{margin:0;}

.footer-inner{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,1.25fr) minmax(0,1.1fr);
  gap:clamp(28px,4vw,64px);
  max-width:var(--max);
  margin:0 auto;
  padding:56px var(--gutter) 44px;
}

.footer-brand-name{
  display:inline-block;
  font-size:clamp(22px,2.6vw,30px);
  font-weight:900;
  line-height:1.1;
  letter-spacing:-.01em;
  color:var(--white);
}
.footer-brand-name:hover{color:var(--white);}
.footer-domain{
  margin-top:8px;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--muted);
}
.footer-motto{
  margin-top:14px;
  font-size:14px;
  letter-spacing:.04em;
  color:var(--gold);
}

.footer-links{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:clamp(20px,3vw,40px);
}
.footer-col{min-width:0;}
.footer-col--contact{min-width:0;}
.footer-col-title{
  margin-bottom:14px;
  font-size:12px;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--muted);
}
.footer-list{display:grid;gap:2px;}
.footer-link{
  display:inline-block;
  padding:6px 0;
  font-size:14.5px;
  color:var(--white);
}
.footer-link:hover{color:var(--gold);}

.footer-contact{display:grid;gap:10px;font-size:14px;}
.footer-contact li{
  display:grid;
  grid-template-columns:64px minmax(0,1fr);
  gap:12px;
  align-items:baseline;
}
.footer-contact-key{
  font-size:12px;
  font-weight:600;
  letter-spacing:.12em;
  color:var(--muted);
}
.footer-contact-val{
  color:var(--white);
  word-break:break-word;
}
.footer-fineprint{
  margin-top:16px;
  max-width:36ch;
  font-size:13px;
  line-height:1.8;
  color:var(--muted);
}

.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  max-width:var(--max);
  margin:0 auto;
  padding:20px var(--gutter) 32px;
  border-top:1px solid var(--line);
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--muted);
}
.footer-legal-copy{margin:0;}
.footer-legal-list{
  display:flex;
  flex-wrap:wrap;
  gap:8px 20px;
}
.footer-legal-list a{color:var(--muted);}
.footer-legal-list a:hover{color:var(--gold);}

/* ---------- 15. 显现动效 ---------- */
.reveal-ready [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .42s var(--ease),transform .42s var(--ease);
}
.reveal-ready [data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- 16. 响应式 ---------- */
@media (max-width:1023px){
  .grid-8{grid-template-columns:repeat(4,minmax(0,1fr));}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr));}

  .footer-inner{
    grid-template-columns:minmax(0,1fr) minmax(0,1fr);
    padding-bottom:36px;
  }
  .footer-col--contact{grid-column:1 / -1;}
  .footer-fineprint{max-width:58ch;}
}

@media (max-width:900px){
  .site-header{padding:0 16px;}
  .header-utility{display:none;}

  .masthead{
    justify-content:space-between;
    padding:14px 0;
    min-height:68px;
  }
  .nav-toggle{
    display:inline-flex;
    position:relative;
    z-index:70;
  }

  .site-nav{
    position:fixed;
    inset:0;
    z-index:60;
    display:flex;
    align-items:flex-start;
    padding:92px var(--gutter) 40px;
    overflow-y:auto;
    overscroll-behavior:contain;
    background:rgba(19,36,67,.95);
    -webkit-backdrop-filter:blur(18px);
    backdrop-filter:blur(18px);
    visibility:hidden;
    opacity:0;
    transform:translateY(-10px);
    transition:opacity .3s var(--ease),transform .38s var(--ease),visibility .38s;
  }
  .site-header[data-open="true"] .site-nav{
    visibility:visible;
    opacity:1;
    transform:none;
  }
  .site-nav-list{
    width:100%;
    flex-direction:column;
    justify-content:flex-start;
    gap:0;
  }
  .site-nav-link{
    display:block;
    width:100%;
    padding:18px 0;
    font-size:20px;
    font-weight:700;
    border-bottom:1px solid var(--line);
  }
  .site-nav-link::after{left:0;bottom:10px;transform:none;}
  .site-nav-link:hover::after,
  .site-nav-link:focus-visible::after,
  .site-nav-link[aria-current="page"]::after{width:44px;}

  body.nav-open{overflow:hidden;}
}

@media (max-width:680px){
  body{font-size:15px;}

  .grid-8,.grid-12{
    grid-template-columns:minmax(0,1fr);
    gap:16px;
  }

  .site-footer{margin-top:72px;}
  .footer-inner{
    grid-template-columns:minmax(0,1fr);
    gap:36px;
    padding:40px var(--gutter) 32px;
  }
  .footer-links{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;}
  .footer-legal{
    flex-direction:column;
    align-items:flex-start;
    padding:20px var(--gutter) 28px;
  }
  .panel{padding:20px 18px 22px;}
}

@media (max-width:400px){
  .brand{font-size:24px;}
  .nav-toggle-label{display:none;}
  .nav-toggle{padding:10px 12px;}
}

/* ---------- 17. 减弱动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}

  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }

  .reveal-ready [data-reveal]{
    opacity:1;
    transform:none;
  }
  .scroll-progress{transition:none;}
}