:root{
  --ink:#e8eef6;
  --muted:#8fa3b8;
  --line:rgba(148,180,210,.18);
  --glass:rgba(10,28,46,.55);
  --glass-strong:rgba(8,22,38,.78);
  --cyan:#5eead4;
  --sky:#38bdf8;
  --grass:#4ade80;
  --deep:#041018;
  --mid:#0a2233;
  --font-display:"Outfit","Noto Sans SC",sans-serif;
  --font-body:"Noto Sans SC","Segoe UI",sans-serif;
  --max:1080px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--deep);
  min-height:100vh;
  line-height:1.7;
  overflow-x:hidden;
}
.bg{
  position:fixed;inset:0;z-index:-2;
  background:
    radial-gradient(1200px 700px at 8% -8%, rgba(56,189,248,.28), transparent 58%),
    radial-gradient(900px 560px at 92% 8%, rgba(94,234,212,.16), transparent 52%),
    radial-gradient(800px 500px at 50% 110%, rgba(74,222,128,.1), transparent 50%),
    linear-gradient(168deg, #041018 0%, #0a2233 42%, #071820 100%);
  animation:bgDrift 18s ease-in-out infinite alternate;
}
.bg-grid{
  position:fixed;inset:0;z-index:-1;pointer-events:none;
  background-image:
    linear-gradient(rgba(148,180,210,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148,180,210,.05) 1px, transparent 1px);
  background-size:48px 48px;
  mask-image:radial-gradient(ellipse 70% 60% at 50% 30%, #000 20%, transparent 75%);
  opacity:.55;
}
@keyframes bgDrift{
  from{filter:hue-rotate(0deg) saturate(1)}
  to{filter:hue-rotate(12deg) saturate(1.08)}
}

.top{
  max-width:var(--max);margin:0 auto;
  padding:20px 22px 0;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.brand{
  font-family:var(--font-display);
  font-weight:800;font-size:18px;letter-spacing:.02em;
  color:var(--ink);text-decoration:none;
}
nav{display:flex;gap:16px;flex-wrap:wrap}
nav a{
  color:var(--muted);text-decoration:none;font-size:13.5px;font-weight:500;
  transition:color .2s;
}
nav a:hover{color:var(--cyan)}

main{max-width:var(--max);margin:0 auto;padding:0 22px 56px}

/* ===== Hero：品牌主导 ===== */
.hero{
  min-height:min(78vh,720px);
  display:grid;
  grid-template-columns:1.05fr .95fr;
  gap:36px;
  align-items:center;
  padding:48px 0 40px;
}
.eyebrow{
  color:var(--cyan);font-size:13px;font-weight:600;
  letter-spacing:.06em;margin-bottom:14px;
  animation:fadeUp .7s ease both;
}
.brand-hero{
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(40px,6.2vw,64px);
  line-height:1.08;
  letter-spacing:-.02em;
  margin-bottom:16px;
  background:linear-gradient(120deg,#f8fafc 20%, #5eead4 70%, #38bdf8);
  -webkit-background-clip:text;background-clip:text;color:transparent;
  animation:fadeUp .75s .08s ease both;
}
.lead{
  font-size:17px;color:#b8c9da;max-width:32em;
  animation:fadeUp .75s .14s ease both;
}
.hero-cta{
  display:flex;gap:12px;flex-wrap:wrap;margin-top:26px;
  animation:fadeUp .75s .2s ease both;
}
.hero-note{
  margin-top:14px;font-size:12.5px;color:var(--muted);
  animation:fadeUp .75s .26s ease both;
}
.hero-note a{color:var(--cyan);text-decoration:none}
.hero-note a:hover{text-decoration:underline}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:11px 20px;border-radius:12px;
  font-size:14px;font-weight:600;text-decoration:none;
  transition:transform .18s, box-shadow .18s, background .18s;
}
.btn:hover{transform:translateY(-1px)}
.btn-primary{
  color:#042f2e;
  background:linear-gradient(135deg,#5eead4,#2dd4bf);
  box-shadow:0 10px 28px rgba(45,212,191,.28);
}
.btn-ghost{
  color:var(--ink);
  background:rgba(255,255,255,.04);
  border:1px solid var(--line);
}
@keyframes fadeUp{
  from{opacity:0;transform:translateY(14px)}
  to{opacity:1;transform:none}
}

.hero-visual{display:flex;justify-content:center;animation:fadeUp .9s .18s ease both}
.glass-pane{
  width:min(100%,360px);
  border-radius:22px;
  background:linear-gradient(160deg, rgba(255,255,255,.1), rgba(255,255,255,.02));
  border:1px solid rgba(255,255,255,.16);
  box-shadow:
    0 30px 60px rgba(0,0,0,.45),
    inset 0 1px 0 rgba(255,255,255,.2);
  backdrop-filter:blur(18px);
  overflow:hidden;
  animation:floatPane 5.5s ease-in-out infinite alternate;
}
@keyframes floatPane{
  from{transform:translateY(0)}
  to{transform:translateY(-10px)}
}
.gp-bar{
  display:flex;align-items:center;gap:6px;
  padding:10px 14px;
  border-bottom:1px solid rgba(255,255,255,.08);
  background:rgba(0,0,0,.18);
  font-size:11px;color:var(--muted);
}
.gp-bar i{
  width:8px;height:8px;border-radius:50%;
  background:#64748b;
}
.gp-bar i:nth-child(1){background:#f87171}
.gp-bar i:nth-child(2){background:#fbbf24}
.gp-bar i:nth-child(3){background:#4ade80}
.gp-bar span{margin-left:8px}
.gp-body{display:grid;grid-template-columns:56px 1fr;min-height:220px}
.gp-nav{
  display:flex;flex-direction:column;gap:10px;
  padding:16px 12px;
  border-right:1px solid rgba(255,255,255,.06);
  background:rgba(0,0,0,.12);
}
.gp-nav span{
  width:28px;height:28px;border-radius:8px;
  background:rgba(255,255,255,.06);
}
.gp-nav span.on{
  background:linear-gradient(135deg,rgba(94,234,212,.45),rgba(56,189,248,.35));
  box-shadow:0 0 0 1px rgba(94,234,212,.35);
}
.gp-main{padding:22px 18px}
.gp-title{font-family:var(--font-display);font-weight:700;font-size:22px}
.gp-sub{font-size:12px;color:var(--muted);margin-top:6px}
.gp-btn{
  margin-top:28px;display:inline-flex;
  padding:10px 18px;border-radius:999px;
  font-size:13px;font-weight:700;color:#042f2e;
  background:linear-gradient(135deg,#4ade80,#22c55e);
  box-shadow:0 8px 24px rgba(34,197,94,.35);
}

/* ===== Features ===== */
.section{padding:28px 0 8px}
.section-head{margin-bottom:22px;max-width:36em}
.section-head h2{
  font-family:var(--font-display);
  font-size:clamp(26px,3.5vw,34px);font-weight:800;
  letter-spacing:-.02em;margin-bottom:8px;
}
.section-head p{color:var(--muted);font-size:15px}

.feature{
  display:grid;
  grid-template-columns:88px 1fr;
  gap:8px 20px;
  padding:26px 0;
  border-top:1px solid var(--line);
}
.feature:last-child{border-bottom:1px solid var(--line)}
.feature-index{
  font-family:var(--font-display);
  font-size:28px;font-weight:800;
  color:rgba(94,234,212,.35);
  line-height:1;
  padding-top:4px;
}
.feature-body h3{
  font-family:var(--font-display);
  font-size:22px;font-weight:700;
  margin-bottom:8px;
}
.feature-body > p{color:#c5d4e4;font-size:15px;max-width:48em}
.feature-body ul{
  margin-top:12px;padding-left:1.15em;
  display:grid;gap:4px;
  color:#a8bdd0;font-size:14px;
}
.feature-body code{
  font-family:ui-monospace,Consolas,monospace;
  font-size:.9em;
  background:rgba(94,234,212,.1);
  padding:.1em .35em;border-radius:5px;
  color:var(--cyan);
}

/* ===== Workflow ===== */
.workflow{padding-top:40px}
.steps{
  list-style:none;
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:14px;
  counter-reset:none;
}
.steps li{
  padding:20px 18px;
  border-radius:18px;
  background:var(--glass);
  border:1px solid var(--line);
  backdrop-filter:blur(12px);
}
.step-n{
  display:inline-flex;align-items:center;justify-content:center;
  width:28px;height:28px;border-radius:9px;
  font-family:var(--font-display);font-weight:700;font-size:13px;
  color:#042f2e;background:var(--cyan);
  margin-bottom:12px;
}
.steps h3{
  font-family:var(--font-display);
  font-size:16px;font-weight:700;margin-bottom:6px;
}
.steps p{font-size:13px;color:var(--muted);line-height:1.55}

/* ===== Legal ===== */
.legal{padding-top:48px}
.legal-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:14px;
}
.legal-grid article{
  padding:20px 20px 16px;
  border-radius:18px;
  background:var(--glass-strong);
  border:1px solid var(--line);
}
.legal-grid h3{
  font-family:var(--font-display);
  font-size:17px;font-weight:700;margin-bottom:8px;
}
.legal-grid p,.legal-grid li{font-size:14px;color:#b7c8d9}
.legal-grid p+p,.legal-grid ul,.legal-grid ol{margin-top:8px}
.legal-grid ul,.legal-grid ol{padding-left:1.15em}
.legal-grid li{margin:3px 0}
.muted{color:var(--muted)!important;font-size:12.5px!important}

footer{
  max-width:var(--max);margin:0 auto;
  padding:8px 22px 40px;
  color:var(--muted);font-size:12px;
}

@media (max-width:900px){
  .hero{grid-template-columns:1fr;min-height:auto;padding-top:28px;gap:28px}
  .hero-visual{order:-1}
  .glass-pane{width:min(100%,320px)}
  .steps{grid-template-columns:1fr 1fr}
  .legal-grid{grid-template-columns:1fr}
}
@media (max-width:560px){
  .feature{grid-template-columns:1fr}
  .feature-index{font-size:22px}
  .steps{grid-template-columns:1fr}
  .top{padding-top:16px}
  nav{gap:12px}
}
@media (prefers-reduced-motion:reduce){
  .bg,.glass-pane,.eyebrow,.brand-hero,.lead,.hero-cta,.hero-visual{animation:none}
}