/* ============================================================
   layout.css —— 导航 / 区块骨架 / 子页头部 / 页脚 / 弹层
   ============================================================ */

/* ────────── 导航 ────────── */
.nav{
  position:sticky;top:0;z-index:60;
  background:rgba(8,11,10,.78);
  backdrop-filter:blur(16px) saturate(140%);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  border-bottom:1px solid var(--line);
}
.nav-in{display:flex;align-items:center;gap:26px;height:var(--nav-h)}

.brand{display:flex;align-items:center;gap:10px;flex:none}
.brand-mark{
  display:grid;place-items:center;
  width:30px;height:30px;border-radius:9px;
  background:rgba(74,222,128,.1);
  border:1px solid rgba(74,222,128,.26);
  box-shadow:0 0 18px -6px rgba(74,222,128,.5);
}
.brand-txt{font-size:16px;font-weight:800;letter-spacing:.02em}
.brand-tag{
  padding-left:10px;margin-left:2px;
  border-left:1px solid var(--line2);
  font-family:ui-monospace,Menlo,Consolas,monospace;
  font-size:10.5px;letter-spacing:.12em;color:var(--dim);
}

.nav-links{display:flex;gap:4px;margin-left:8px}
.nl{
  position:relative;padding:8px 13px;border-radius:9px;
  font-size:14px;color:var(--mut);
  transition:color .16s,background .16s;
}
.nl:hover{color:var(--txt);background:rgba(255,255,255,.04)}
.nl.on{color:var(--txt);font-weight:600}
.nl.on::after{
  content:"";position:absolute;left:13px;right:13px;bottom:2px;height:2px;
  border-radius:2px;background:linear-gradient(90deg,var(--grn),var(--cyan));
}

.nav-right{display:flex;align-items:center;gap:14px;margin-left:auto}

.nav-burger{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:38px;height:38px;padding:0 9px;
  background:transparent;border:1px solid var(--line);border-radius:9px;
  cursor:pointer;
}
.nav-burger span{
  display:block;height:1.5px;width:100%;background:var(--txt2);border-radius:2px;
  transition:transform .2s,opacity .2s;
}
body.drawer-open .nav-burger span:nth-child(1){transform:translateY(6.5px) rotate(45deg)}
body.drawer-open .nav-burger span:nth-child(2){opacity:0}
body.drawer-open .nav-burger span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}

.nav-drawer{
  position:absolute;left:0;right:0;top:100%;
  background:var(--bg2);border-bottom:1px solid var(--line);
  padding:10px 22px 18px;
  display:grid;gap:2px;
  box-shadow:0 24px 40px -24px #000;
}
.nav-drawer[hidden]{display:none}
.nav-drawer a{
  padding:12px 6px;font-size:15px;color:var(--txt2);
  border-bottom:1px solid var(--line);
}
.nav-drawer a:last-child{border-bottom:0;color:var(--grn)}

/* 抽屉展开时给页面压一层遮罩，点空白处关闭 */
body.drawer-open::after{
  content:"";position:fixed;left:0;right:0;top:var(--nav-h);bottom:0;
  z-index:55;
  background:rgba(3,6,5,.55);
  -webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);
}

/* ────────── 区块骨架 ────────── */
.sec{
  position:relative;
  padding:88px 0;
  border-top:1px solid var(--line);
  scroll-margin-top:calc(var(--nav-h) + 12px);
}
.sec-tight{padding-top:56px}
.sec-alt{background:linear-gradient(180deg,var(--bg2),var(--bg))}

.sec-head{max-width:640px;margin-bottom:42px}
.sec-k{
  display:flex;align-items:center;gap:10px;
  margin:0 0 12px;
  font-family:ui-monospace,Menlo,Consolas,monospace;
  font-size:11px;font-weight:600;letter-spacing:.22em;color:var(--grn);
}
.sec-k::before{content:"";width:26px;height:1px;background:linear-gradient(90deg,var(--grn),transparent)}
.sec-t{
  font-size:clamp(24px,3.3vw,34px);font-weight:800;
  letter-spacing:-.018em;line-height:1.25;
}
.sec-s{margin-top:12px;font-size:15px;color:var(--mut);line-height:1.72}

/* ────────── 子页头部 ────────── */
.subhero{
  position:relative;overflow:hidden;
  padding:76px 0 34px;
  border-bottom:1px solid var(--line);
}
.subhero-glow{
  position:absolute;top:-300px;left:8%;right:8%;height:520px;
  pointer-events:none;
  background:radial-gradient(closest-side,rgba(74,222,128,.2),rgba(56,189,248,.08) 60%,transparent 78%);
  filter:blur(18px);
}
.subhero .wrap{position:relative}
.subhero h1{
  font-size:clamp(32px,5vw,50px);font-weight:800;
  letter-spacing:-.028em;line-height:1.12;
}
.subhero-sub{
  margin-top:16px;max-width:620px;
  font-size:15.5px;color:var(--mut);line-height:1.75;
}
.subhero-sub a{color:var(--grn);border-bottom:1px solid rgba(74,222,128,.35)}

/* ────────── 末尾 CTA ────────── */
.cta-band{padding:24px 0 96px}
.cta-in{
  position:relative;overflow:hidden;
  display:grid;grid-template-columns:1.35fr auto;align-items:center;gap:36px;
  padding:46px 48px;
  border-radius:var(--r-xl);
  border:1px solid rgba(74,222,128,.24);
  background:
    radial-gradient(120% 160% at 0% 0%,rgba(74,222,128,.16),transparent 58%),
    radial-gradient(100% 140% at 100% 100%,rgba(56,189,248,.1),transparent 62%),
    linear-gradient(180deg,#0f1a16,#0a1210);
}
.cta-in::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(var(--line) 1px,transparent 1px),
    linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:48px 48px;
  opacity:.5;
  -webkit-mask-image:radial-gradient(ellipse at 80% 20%,#000,transparent 70%);
  mask-image:radial-gradient(ellipse at 80% 20%,#000,transparent 70%);
}
.cta-in > *{position:relative;z-index:1}
.cta-in h2{font-size:clamp(22px,3vw,30px);font-weight:800;letter-spacing:-.02em}
.cta-in p{margin-top:8px;font-size:14.5px;color:var(--mut)}
.cta-acts{display:flex;gap:12px;flex-wrap:wrap}

/* ────────── 页脚 ────────── */
.foot{
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,var(--bg2),#070a09);
  padding:56px 0 26px;
}
.foot-grid{
  display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;
  gap:38px;padding-bottom:40px;
}
.foot-col{display:flex;flex-direction:column;align-items:flex-start;gap:10px}
.foot-col h4{
  margin:0 0 4px;
  font-size:11.5px;font-weight:700;letter-spacing:.16em;
  text-transform:uppercase;color:var(--dim);
}
.foot-col a{font-size:13.5px;color:var(--mut);transition:color .15s}
.foot-col a:hover{color:var(--grn)}
.foot-brandcol{gap:14px;max-width:320px}
.foot-desc{font-size:13.5px;color:var(--mut);line-height:1.7}
.foot-ver{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:12px;color:var(--dim)}
.foot-ver b{color:var(--txt2);font-weight:600}
.foot-host{font-size:12.5px;color:var(--dim)}
.foot-state{padding:2px 0}
.foot-legal{
  display:flex;flex-wrap:wrap;gap:6px 18px;justify-content:flex-end;
  padding:0 0 14px;font-size:12px;
}
.foot-legal a{color:var(--dim)}
.foot-legal a:hover{color:var(--txt2)}
@media (max-width:720px){.foot-legal{justify-content:flex-start}}

.foot-bot{
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  padding-top:24px;border-top:1px solid var(--line);
  font-size:12px;color:var(--dim);
}
.foot-bot p{max-width:640px;line-height:1.7}
.foot-copy{white-space:nowrap}

/* ────────── 弹层 ────────── */
.modal{
  position:fixed;inset:0;z-index:200;
  display:grid;place-items:center;padding:20px;
  background:rgba(3,6,5,.72);
  backdrop-filter:blur(5px);
}
.modal[hidden]{display:none}
.modal-box{
  width:min(410px,100%);position:relative;
  padding:28px;
  border-radius:var(--r-lg);
  border:1px solid var(--line2);
  background:linear-gradient(170deg,var(--panel2),var(--panel));
  box-shadow:0 40px 80px -30px #000;
  animation:pop .22s var(--ease);
}
@keyframes pop{from{opacity:0;transform:translateY(10px) scale(.98)}to{opacity:1;transform:none}}
.modal-box h3{margin:0 0 6px;font-size:19px;font-weight:800}
.modal-sub{margin:0 0 20px;font-size:13px;color:var(--mut)}
.modal-x{
  position:absolute;top:12px;right:14px;
  width:30px;height:30px;display:grid;place-items:center;
  border:0;border-radius:8px;background:transparent;
  color:var(--dim);font-size:22px;line-height:1;cursor:pointer;
}
.modal-x:hover{color:var(--txt);background:rgba(255,255,255,.06)}
.modal-foot{margin:2px 0 0;font-size:13px;color:var(--dim);text-align:center}
.modal-foot a{color:var(--grn)}

/* ────────── Toast ────────── */
.toast{
  position:fixed;left:50%;bottom:34px;transform:translateX(-50%);
  z-index:300;
  padding:11px 20px;border-radius:11px;
  background:#1b2823;border:1px solid var(--line2);
  color:var(--txt);font-size:13.5px;
  box-shadow:0 18px 40px -16px #000;
  animation:up .22s var(--ease);
}
.toast[hidden]{display:none}
@keyframes up{from{opacity:0;transform:translate(-50%,12px)}to{opacity:1;transform:translate(-50%,0)}}

/* ────────── 404 ────────── */
.notfound{
  position:relative;overflow:hidden;
  padding:120px 0 130px;text-align:center;
}
.notfound .wrap{position:relative}
.nf-code{
  font-family:ui-monospace,Menlo,Consolas,monospace;
  font-size:clamp(76px,16vw,140px);font-weight:800;line-height:1;
  letter-spacing:-.04em;
  background:linear-gradient(180deg,rgba(126,240,168,.55),rgba(56,189,248,.12));
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;
}
.notfound h1{margin-top:10px;font-size:clamp(24px,4vw,34px);font-weight:800;letter-spacing:-.02em}
.notfound .subhero-sub{margin:14px auto 0}
.nf-acts{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:32px}
.nf-links{justify-content:center}
.nf-links .chip:hover{border-color:rgba(74,222,128,.5);color:var(--grn)}