/* ============================================================
   site.css — 356手机版登录 · 中文专区 V2.0 共享外壳与基础组件
   框架式导航 / 左侧版本轴 / 暗色控制台秩序感
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0;}
ul,ol{list-style:none;}
img,svg,video{max-width:100%;}
button{font:inherit;color:inherit;}
a{color:inherit;}
table{border-collapse:collapse;}

/* ---------- 2. Tokens ---------- */
:root{
  --ink:#0B132B;
  --panel:#111C3A;
  --panel-2:#0E1830;
  --jade:#123C3A;
  --cyan:#38E1D6;
  --gold:#F2B84B;
  --coral:#FF6B5E;
  --mist:#8FA6B2;
  --white:#F5F9FC;
  --amber:#5A4426;

  --line:rgba(143,166,178,.22);
  --line-strong:rgba(143,166,178,.42);
  --cyan-soft:rgba(56,225,214,.10);
  --gold-soft:rgba(242,184,75,.12);
  --coral-soft:rgba(255,107,94,.12);

  --rail-w:84px;
  --maxw:1240px;
  --gutter:clamp(18px,3.4vw,48px);
  --radius:16px;
  --radius-sm:10px;

  --font-display:"Barlow Condensed","Arial Narrow","Helvetica Neue","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular","Cascadia Mono","Roboto Mono",Menlo,Consolas,"Liberation Mono",monospace;
}

/* ---------- 3. Base ---------- */
html{
  background-color:var(--ink);
  background-image:
    radial-gradient(900px 520px at 84% -8%, rgba(56,225,214,.12), transparent 70%),
    radial-gradient(760px 540px at -10% 94%, rgba(18,60,58,.55), transparent 72%);
  background-repeat:no-repeat;
  background-attachment:fixed;
}
body{
  background:transparent;
  color:var(--white);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  min-height:100vh;
}
main{display:block;}
#main-content{scroll-margin-top:100px;}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.1;
  letter-spacing:.015em;
  font-stretch:semi-condensed;
  color:var(--white);
}
p{max-width:72ch;}
strong{color:var(--white);font-weight:700;}
a{text-decoration-thickness:1px;text-underline-offset:3px;}

:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:4px;
}

.mono{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--mist);
}
.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;
}

/* ---------- 4. Skip link ---------- */
.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:300;
  transform:translateY(-180%);
  padding:11px 18px;
  border-radius:var(--radius-sm);
  background:var(--cyan);
  color:#04140f;
  font-size:14px;
  font-weight:700;
  text-decoration:none;
  transition:transform .18s ease;
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0);outline-offset:2px;}

/* ---------- 5. Header frame ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(11,19,43,.94);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
}
.header-frame{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  align-items:center;
  gap:10px 16px;
  max-width:var(--maxw);
  margin-inline:auto;
  padding:12px var(--gutter);
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  min-width:0;
  text-decoration:none;
  color:var(--white);
}
.brand-mark{
  position:relative;
  flex:0 0 auto;
  width:38px;height:38px;
  display:grid;place-items:center;
  border:1px solid rgba(56,225,214,.55);
  border-radius:11px;
  background:linear-gradient(155deg,rgba(56,225,214,.18),rgba(56,225,214,0) 72%);
}
.brand-mark::before{
  content:"";
  width:12px;height:12px;
  border-radius:3px;
  background:var(--gold);
  box-shadow:0 0 0 4px rgba(242,184,75,.14);
}
.brand-mark::after{
  content:"";
  position:absolute;
  right:-3px;bottom:-3px;
  width:8px;height:8px;
  border-radius:50%;
  background:var(--coral);
  border:2px solid var(--ink);
}
.brand-text{display:flex;flex-direction:column;gap:2px;min-width:0;}
.brand-name{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:700;
  line-height:1.15;
  letter-spacing:.05em;
  white-space:nowrap;
}
.brand-line{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.09em;
  color:var(--mist);
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.frame-utility{
  display:none;
  padding-left:18px;
  border-left:1px solid var(--line);
  white-space:nowrap;
}
.frame-nav{
  grid-column:1 / -1;
  grid-row:2;
  display:none;
}
.site-header[data-open] .frame-nav{display:block;}
.nav-list{display:flex;flex-direction:column;gap:2px;}
.nav-link{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:12px;
  padding:12px;
  border-radius:var(--radius-sm);
  color:var(--mist);
  font-size:15px;
  font-weight:500;
  letter-spacing:.02em;
  text-decoration:none;
  transition:color .16s ease,background-color .16s ease,box-shadow .16s ease;
}
.nav-index{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.1em;
  color:rgba(143,166,178,.8);
  transition:color .16s ease;
}
.nav-label{white-space:nowrap;}
.nav-link:hover{color:var(--white);background:var(--cyan-soft);}
.nav-link:hover .nav-index{color:var(--cyan);}
.nav-link[aria-current="page"]{
  color:var(--cyan);
  background:var(--cyan-soft);
  box-shadow:inset 0 0 0 1px rgba(56,225,214,.34);
}
.nav-link[aria-current="page"] .nav-index{color:var(--gold);}
.frame-actions{
  justify-self:end;
  display:flex;
  align-items:center;
  gap:8px;
}
.frame-progress{
  height:2px;
  background:rgba(143,166,178,.14);
  overflow:hidden;
}
.frame-progress-bar{
  display:block;
  height:100%;
  width:var(--scroll,0%);
  background:linear-gradient(90deg,var(--cyan),var(--gold));
  transition:width .12s linear;
}

/* ---------- 6. Buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 18px;
  border:1px solid transparent;
  border-radius:var(--radius-sm);
  font-family:var(--font-body);
  font-size:14px;
  font-weight:600;
  letter-spacing:.03em;
  line-height:1;
  text-decoration:none;
  cursor:pointer;
  transition:transform .16s ease,background-color .16s ease,color .16s ease,border-color .16s ease;
}
.btn-primary{
  background:var(--cyan);
  color:#04140f;
  box-shadow:0 10px 26px -18px rgba(56,225,214,.95);
}
.btn-primary:hover{background:#5cefe5;transform:translateY(-1px);}
.btn-primary:active{transform:translateY(0);}
.btn-ghost{
  background:transparent;
  border-color:var(--line-strong);
  color:var(--white);
}
.btn-ghost:hover{border-color:var(--cyan);color:var(--cyan);}
.btn-gold{background:var(--gold);color:#21160a;}
.btn-gold:hover{background:#ffcb6b;transform:translateY(-1px);}
.btn-block{width:100%;}

/* ---------- 7. Mobile nav toggle ---------- */
.nav-toggle{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:9px 12px;
  border:1px solid var(--line-strong);
  border-radius:var(--radius-sm);
  background:var(--panel);
  color:var(--white);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  cursor:pointer;
  transition:border-color .16s ease,color .16s ease;
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan);}
.nav-toggle-bars{display:grid;gap:4px;width:16px;}
.nav-toggle-bars i{
  display:block;
  height:2px;
  width:16px;
  border-radius:2px;
  background:currentColor;
  transition:transform .18s ease,width .18s ease;
}
.nav-toggle-bars i:last-child{width:11px;}
.site-header[data-open] .nav-toggle{border-color:var(--coral);color:var(--coral);}
.site-header[data-open] .nav-toggle-bars i:first-child{transform:translateY(3px) rotate(45deg);}
.site-header[data-open] .nav-toggle-bars i:last-child{width:16px;transform:translateY(-3px) rotate(-45deg);}

/* ---------- 8. Left version axis ---------- */
.axis-rail{display:none;}

/* ---------- 9. Footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,120px);
  background:var(--panel-2);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0 0 auto 0;
  height:3px;
  background:linear-gradient(90deg,var(--cyan),var(--gold) 58%,var(--coral));
  opacity:.85;
}
.footer-frame{
  max-width:var(--maxw);
  margin-inline:auto;
  padding:clamp(38px,6vw,76px) var(--gutter) 26px;
}
.footer-top{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(30px,4.5vw,52px);
}
.footer-brand{min-width:0;}
.footer-brand-name{
  font-family:var(--font-display);
  font-size:clamp(26px,3.4vw,34px);
  font-weight:700;
  line-height:1.1;
  letter-spacing:.03em;
}
.footer-brand-line{
  margin-top:6px;
  font-size:10.5px;
  color:var(--mist);
}
.footer-status{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  margin-top:16px;
}
.status-chip{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:5px 11px;
  border:1px solid var(--line-strong);
  border-radius:999px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.12em;
  color:var(--mist);
}
.status-chip::before{
  content:"";
  width:6px;height:6px;
  border-radius:50%;
  background:currentColor;
}
.status-chip--live{
  color:var(--cyan);
  border-color:rgba(56,225,214,.42);
  background:var(--cyan-soft);
}
.status-chip--sync{
  color:var(--gold);
  border-color:rgba(242,184,75,.42);
  background:var(--gold-soft);
}
.footer-note{
  margin-top:16px;
  max-width:36ch;
  font-size:14px;
  line-height:1.72;
  color:var(--mist);
}
.footer-col{min-width:0;}
.footer-col--contact{display:flex;flex-direction:column;gap:16px;}
.footer-col-title{
  margin-bottom:14px;
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:600;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--mist);
}
.footer-links{display:grid;gap:9px;}
.footer-link{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-size:15px;
  color:rgba(245,249,252,.82);
  text-decoration:none;
  transition:color .15s ease;
}
.footer-link::before{
  content:"";
  flex:0 0 auto;
  width:5px;height:5px;
  border-radius:1px;
  background:var(--line-strong);
  transition:background-color .15s ease;
}
.footer-link:hover{color:var(--cyan);}
.footer-link:hover::before{background:var(--cyan);}
.footer-contact{display:grid;gap:12px;}
.footer-contact-line{display:grid;gap:2px;max-width:none;}
.footer-contact-label{
  display:block;
  font-size:9.5px;
  letter-spacing:.2em;
  color:rgba(143,166,178,.72);
}
.footer-contact-value{
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.02em;
  line-height:1.6;
  color:var(--white);
  word-break:break-word;
}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 22px;
  margin-top:clamp(28px,4vw,46px);
  padding-top:18px;
  border-top:1px solid var(--line);
}
.footer-legal{display:flex;flex-wrap:wrap;align-items:center;gap:6px 18px;}
.legal-link{
  font-size:13px;
  color:var(--mist);
  text-decoration:none;
  transition:color .15s ease;
}
.legal-link:hover{color:var(--cyan);text-decoration:underline;}
.footer-copy{
  font-size:12.5px;
  color:rgba(143,166,178,.82);
  max-width:none;
}
.footer-icp{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:rgba(143,166,178,.72);
  max-width:none;
}

/* ---------- 10. Layout utilities ---------- */
.container{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(38px,6vw,78px);}
.section-head{
  display:grid;
  gap:12px;
  max-width:64ch;
  margin-bottom:clamp(22px,3vw,38px);
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--cyan);
}
.eyebrow::before{
  content:"";
  width:24px;height:1px;
  background:var(--cyan);
}
.section-title{font-size:clamp(28px,4vw,46px);}
.section-lede{
  font-size:clamp(15px,1.5vw,17.5px);
  line-height:1.78;
  color:var(--mist);
  max-width:60ch;
}
.index-num{
  font-family:var(--font-display);
  font-size:clamp(40px,6vw,64px);
  font-weight:700;
  line-height:.9;
  letter-spacing:.02em;
  color:rgba(242,184,75,.3);
}
.divider{
  height:1px;
  border:0;
  background:var(--line);
  margin-block:clamp(28px,4vw,56px);
}
.grid{display:grid;gap:clamp(16px,2.4vw,28px);grid-template-columns:1fr;}

/* ---------- 11. Breadcrumb ---------- */
.breadcrumb{padding-top:18px;}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--mist);
}
.breadcrumb-list li{display:flex;align-items:center;gap:8px;}
.breadcrumb-list li + li::before{content:"/";color:rgba(143,166,178,.5);}
.breadcrumb-link{color:var(--mist);text-decoration:none;transition:color .15s ease;}
.breadcrumb-link:hover{color:var(--cyan);}
.breadcrumb-current{color:var(--white);}

/* ---------- 12. Cards & panels ---------- */
.panel{
  padding:clamp(20px,3vw,32px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--panel-2);
}
.card{
  position:relative;
  padding:clamp(18px,2.4vw,26px);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--panel);
  transition:border-color .18s ease,transform .18s ease;
}
.card:hover{border-color:rgba(56,225,214,.42);}
.card-kicker{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--gold);
}
.card-title{margin-top:8px;font-size:20px;}
.card-text{
  margin-top:8px;
  font-size:15px;
  line-height:1.72;
  color:var(--mist);
}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  border:1px solid rgba(56,225,214,.32);
  border-radius:6px;
  background:var(--cyan-soft);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.12em;
  color:var(--cyan);
}
.tag--gold{color:var(--gold);background:var(--gold-soft);border-color:rgba(242,184,75,.36);}
.tag--coral{color:var(--coral);background:var(--coral-soft);border-color:rgba(255,107,94,.36);}
.link-arrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding-bottom:2px;
  border-bottom:1px solid rgba(56,225,214,.38);
  font-size:14px;
  font-weight:600;
  color:var(--cyan);
  text-decoration:none;
}
.link-arrow::after{content:"→";transition:transform .16s ease;}
.link-arrow:hover::after{transform:translateX(3px);}

/* ---------- 13. Prose ---------- */
.prose{max-width:70ch;color:rgba(245,249,252,.9);}
.prose p + p{margin-top:1em;}
.prose h2,.prose h3{margin-top:1.6em;margin-bottom:.45em;}
.prose h2{font-size:clamp(24px,3vw,32px);}
.prose h3{font-size:clamp(19px,2.2vw,22px);}
.prose ul{display:grid;gap:.5em;margin-top:1em;}
.prose ul li{position:relative;padding-left:20px;}
.prose ul li::before{
  content:"";
  position:absolute;
  left:0;top:.68em;
  width:8px;height:8px;
  border-radius:2px;
  background:var(--cyan);
  opacity:.7;
}
.prose a{color:var(--cyan);}

/* ---------- 14. Media frame ---------- */
.media-frame{
  position:relative;
  display:grid;
  place-items:center;
  overflow:hidden;
  width:100%;
  aspect-ratio:16 / 10;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background-color:var(--panel);
  background-image:
    repeating-linear-gradient(0deg,rgba(143,166,178,.10) 0 1px,transparent 1px 26px),
    repeating-linear-gradient(90deg,rgba(143,166,178,.10) 0 1px,transparent 1px 26px);
}
.media-frame img,.media-frame video{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:21 / 9;}
.media-frame--tall{aspect-ratio:4 / 5;}
.media-frame__label{
  position:absolute;
  left:12px;bottom:12px;
  padding:4px 9px;
  border:1px solid var(--line);
  border-radius:6px;
  background:rgba(11,19,43,.82);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--mist);
}

/* ---------- 15. Tabs ---------- */
.tabs{display:block;}
.tab-list{
  display:flex;
  flex-wrap:wrap;
  gap:6px;
  width:fit-content;
  max-width:100%;
  padding:5px;
  border:1px solid var(--line);
  border-radius:999px;
  background:var(--panel);
}
.tab{
  appearance:none;
  border:0;
  border-radius:999px;
  padding:8px 16px;
  background:transparent;
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  cursor:pointer;
  transition:background-color .16s ease,color .16s ease;
}
.tab:hover{color:var(--white);}
.tab[aria-selected="true"]{background:var(--cyan);color:#04140f;}
.tab-panel{display:block;padding-top:22px;}
.tab-panel[hidden]{display:none;}

/* ---------- 16. Breakpoints ---------- */
@media (min-width:640px){
  .footer-top{grid-template-columns:repeat(2,minmax(0,1fr));}
  .grid--2,.grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
}

@media (max-width:639px){
  .brand-line{display:none;}
  .brand-mark{width:32px;height:32px;border-radius:9px;}
  .brand-mark::before{width:10px;height:10px;}
  .brand-name{font-size:16px;}
  .btn{padding:9px 13px;font-size:12.5px;}
  .nav-toggle{padding:9px 10px;}
  .nav-toggle-text{display:none;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
}

@media (min-width:900px){
  .header-frame{
    grid-template-columns:auto minmax(0,1fr) auto;
    gap:clamp(12px,2vw,26px);
    padding-block:14px;
  }
  .frame-nav{
    grid-column:auto;
    grid-row:auto;
    display:block;
    justify-self:end;
  }
  .site-header[data-open] .frame-nav{display:block;}
  .nav-list{flex-direction:row;align-items:center;gap:2px;}
  .nav-link{
    justify-content:flex-start;
    gap:6px;
    padding:9px 11px;
    font-size:14.5px;
  }
  .nav-toggle{display:none;}
}

@media (min-width:1024px){
  body{padding-left:var(--rail-w);}
  .axis-rail{
    position:fixed;
    inset:0 auto 0 0;
    z-index:70;
    display:flex;
    flex-direction:column;
    align-items:center;
    gap:16px;
    width:var(--rail-w);
    padding:20px 0 22px;
    background:var(--panel);
    border-right:1px solid var(--line);
  }
  .rail-mark{
    font-family:var(--font-display);
    font-size:15px;
    font-weight:700;
    letter-spacing:.14em;
    color:var(--gold);
  }
  .rail-track{
    position:relative;
    flex:1 1 auto;
    width:2px;
    border-radius:2px;
    background:rgba(143,166,178,.2);
    overflow:hidden;
  }
  .rail-fill{
    display:block;
    width:100%;
    height:var(--scroll,0%);
    border-radius:2px;
    background:var(--cyan);
    transition:height .12s linear;
  }
  .rail-meta{
    writing-mode:vertical-rl;
    font-family:var(--font-mono);
    font-size:10px;
    letter-spacing:.28em;
    color:var(--mist);
  }
  .grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
  .footer-top{grid-template-columns:minmax(0,1.4fr) minmax(0,.8fr) minmax(0,.8fr) minmax(0,1.15fr);}
}

@media (min-width:1200px){
  .header-frame{grid-template-columns:auto auto minmax(0,1fr) auto;}
  .frame-utility{display:block;}
}

/* ---------- 17. Reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .btn-primary:hover,.btn-gold:hover{transform:none;}
  .link-arrow:hover::after{transform:none;}
}