/* styles.css - 现代、清新、响应式风格 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700;800&display=swap');

:root{
  --bg:#f6fbff;
  --card:#ffffff;
  --muted:#7b8794;
  --accent:#0077ff;
  --accent-2:#36c6a6;
  --maxw:1080px;
  --glass: rgba(255,255,255,0.7);
  --shadow: 0 10px 30px rgba(19,30,43,0.06);
}

*{box-sizing:border-box}
html,body{height:100%;margin:0;background:linear-gradient(180deg,#f6fbff 0%, #f2f7fb 100%);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,"Helvetica Neue",Arial;color:#092034}
a{color:var(--accent);text-decoration:none}
.container{max-width:var(--maxw);margin:28px auto;padding:20px}
.header{
  display:flex;align-items:center;gap:18px;padding:12px 8px;
  background:linear-gradient(90deg, rgba(255,255,255,0.6), rgba(255,255,255,0.4));
  border-radius:14px;
  box-shadow:var(--shadow);
}
.brand{display:flex;align-items:center;gap:12px}
.logo{
  width:64px;height:64px;display:flex;align-items:center;justify-content:center;border-radius:12px;
  background:linear-gradient(135deg,var(--accent),#4ab3ff);color:white;font-weight:700;font-size:18px;
  box-shadow:0 6px 20px rgba(43,140,255,0.12);
}
.title h1{margin:0;font-size:1.2rem}
.title p{margin:0;color:var(--muted);font-size:0.9rem}

.nav{
  margin-left:auto;display:flex;gap:8px;flex-wrap:wrap;align-items:center;
}
.nav a{
  padding:8px 12px;border-radius:10px;background:transparent;border:1px solid rgba(9,32,52,0.06);
  font-weight:600;color:#08304a;
}
.hero{
  margin-top:22px;padding:28px;border-radius:16px;background:linear-gradient(180deg,rgba(255,255,255,0.9),#ffffff);
  display:grid;grid-template-columns:1fr 360px;gap:20px;box-shadow:var(--shadow)
}
.hero-left h2{margin:0 0 12px 0;font-size:1.55rem;color:#052034}
.hero-left p{color:var(--muted);margin:0 0 18px 0}
.cta{display:inline-block;background:var(--accent);color:white;padding:10px 16px;border-radius:12px;font-weight:700}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:16px}
.card{
  background:var(--card);padding:14px;border-radius:12px;box-shadow:0 8px 20px rgba(10,20,34,0.04);border:1px solid rgba(10,20,34,0.02);
  display:flex;gap:12px;align-items:flex-start;
}
.icon-wrap{width:46px;height:46;border-radius:10px;background:linear-gradient(180deg,var(--accent) 0%, #58b1ff 100%);display:flex;align-items:center;justify-content:center;color:white;font-weight:700}
.card h4{margin:0 0 6px 0}
.card p{margin:0;color:var(--muted);font-size:0.92rem}

/* page layout */
.page{margin-top:18px;display:grid;grid-template-columns:1fr 310px;gap:20px}
.content section{margin-bottom:16px;background:var(--card);padding:18px;border-radius:12px;box-shadow:var(--shadow)}
.aside{position:sticky;top:24px}
.small{font-size:0.92rem;color:var(--muted)}
.kv{display:flex;gap:12px;align-items:center}
.kv strong{font-size:1.05rem}
.formula{background:#f3f8ff;padding:12px;border-radius:10px;border:1px solid rgba(10,20,34,0.03);font-family:monospace}

/* responsive */
@media (max-width:1000px){
  .hero{grid-template-columns:1fr}
  .page{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .nav{display:none}
}

/* nice lists */
ul.kv-list{padding-left:1.15rem}
.footer{margin-top:18px;padding:14px;border-radius:12px;background:rgba(255,255,255,0.65);color:var(--muted);font-size:0.95rem}
.badge{display:inline-block;padding:6px 10px;border-radius:999px;background:linear-gradient(90deg,var(--accent-2),#6dd6c2);color:white;font-weight:700}

/* responsive images */
.svg-ill{width:100%;height:auto;max-height:280px;display:block}

/* stat cards */
.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;margin-top:12px}
.stat-card{background:var(--card);padding:14px;border-radius:12px;box-shadow:var(--shadow);border:1px solid rgba(9,32,52,0.04)}
.stat-card .label{font-size:0.85rem;color:var(--muted);margin:0 0 6px}
.stat-card .value{font-size:1.6rem;font-weight:700;margin:0}
.stat-card .value.positive{color:var(--accent-2)}
.stat-card .sub{margin:6px 0 0;font-size:0.85rem;color:var(--muted)}
.stat-card .sub.neutral{color:#f29e4c}
.stat-bar{width:100%;height:6px;border-radius:999px;background:rgba(8,48,74,0.08);margin:6px 0}
.stat-bar span{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,var(--accent),#59b2ff)}

/* calculator */
.calc-form{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin-top:12px}
.calc-form label{display:flex;flex-direction:column;font-size:0.9rem;font-weight:600;color:#052034}
.calc-form input,.calc-form select{margin-top:6px;border:1px solid rgba(9,32,52,0.12);border-radius:10px;padding:10px;font-size:1rem;background:#f8fbff}
.calc-form input:focus,.calc-form select:focus{outline:2px solid var(--accent);border-color:var(--accent)}
.calc-form button{grid-column:1/-1;padding:12px 16px;border:none;border-radius:12px;background:var(--accent);color:#fff;font-weight:700;font-size:1rem;cursor:pointer;box-shadow:0 10px 20px rgba(0,119,255,0.2)}
.calc-form button:hover{filter:brightness(1.05)}
.calc-result{margin-top:12px;background:#f3f8ff;border:1px solid rgba(9,32,52,0.08);border-radius:12px;padding:14px;font-size:0.95rem;color:#052034}

/* buttons & actions */
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 18px;border-radius:12px;font-weight:700;font-size:0.95rem;border:1px solid transparent;cursor:pointer;transition:all .2s ease}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 10px 20px rgba(0,119,255,0.2)}
.btn-secondary{background:var(--accent-2);color:#fff;box-shadow:0 10px 20px rgba(12,180,150,0.2)}
.btn-ghost{background:rgba(9,32,52,0.05);color:#052034;border-color:rgba(9,32,52,0.16)}
.btn:hover{transform:translateY(-1px);box-shadow:0 12px 24px rgba(9,32,52,0.12)}
.action-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}

/* marketing cards */
.case-grid,.matrix-grid{display:grid;gap:12px}
.case-grid{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.case-card,.matrix-card,.offer-card{background:var(--card);border-radius:12px;border:1px solid rgba(9,32,52,0.06);box-shadow:var(--shadow);padding:16px}
.case-card p{margin:0;color:#052034;font-size:0.95rem}
.case-card .meta{margin-top:10px;color:var(--muted);font-size:0.85rem}
.matrix-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}
.matrix-card{display:flex;flex-direction:column;transition:transform .2s ease}
.matrix-card:hover{transform:translateY(-2px)}
.matrix-card h4{margin:0 0 8px;font-size:1rem}
.matrix-card p{margin:0 0 10px;color:var(--muted);font-size:0.9rem}
.matrix-card .badge{margin-top:auto;align-self:flex-start}
.offer-card h3{margin:0 0 8px}
.offer-card p{margin:0 0 12px;color:var(--muted)}

/* subscribe */
.subscribe-box{margin-top:22px;padding:22px;border-radius:16px;background:linear-gradient(120deg,rgba(0,119,255,0.08),rgba(54,198,166,0.08));display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between}
.subscribe-box form{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.subscribe-box input{padding:10px 12px;border-radius:10px;border:1px solid rgba(9,32,52,0.2);min-width:220px}
.subscribe-status{font-size:0.85rem;color:var(--muted);margin-top:6px}
.subscribe-status.success{color:var(--accent-2);font-weight:600}
.qr-box{text-align:center}
.qr-placeholder{width:110px;height:110px;border-radius:12px;border:2px dashed rgba(9,32,52,0.2);display:flex;align-items:center;justify-content:center;font-weight:700;color:#052034;margin-top:6px}

@media (max-width:700px){
  .subscribe-box{flex-direction:column;align-items:flex-start}
  .action-row{flex-direction:column}
}