:root{
    --bg:#0f172a;
    --card:#ffffff;
    --muted:#64748b;
    --line:#e2e8f0;
    --accent:#2563eb;
    --accent-2:#7c3aed;
    --ok:#16a34a;
    --soft:#f8fafc;
    --text:#0f172a;
    --shadow:0 20px 60px rgba(15,23,42,.18);
  }
  *{box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{
    margin:0;
    font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;
    color:var(--text);
    background:
      radial-gradient(900px 500px at 10% -10%,rgba(37,99,235,.28),transparent 60%),
      radial-gradient(800px 500px at 100% 0%,rgba(124,58,237,.22),transparent 55%),
      linear-gradient(180deg,#f8fafc 0%,#eef2ff 45%,#f8fafc 100%);
    min-height:100vh;
  }
  a{color:inherit}
  .topbar{
    position:sticky;top:0;z-index:20;
    backdrop-filter:blur(14px);
    background:rgba(255,255,255,.78);
    border-bottom:1px solid rgba(226,232,240,.9);
  }
  .topbar-inner{
    max-width:1180px;margin:0 auto;padding:14px 20px;
    display:flex;align-items:center;justify-content:space-between;gap:16px;
  }
  .brand{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.2px}
  .logo{
    width:40px;height:40px;border-radius:12px;
    background:linear-gradient(135deg,var(--accent),var(--accent-2));
    color:#fff;display:grid;place-items:center;font-size:18px;
    box-shadow:0 10px 24px rgba(37,99,235,.35);
  }
  .brand small{display:block;font-weight:500;color:var(--muted);font-size:12px}
  nav{display:flex;gap:18px;font-size:14px;color:#334155}
  nav a{text-decoration:none;padding:8px 10px;border-radius:10px}
  nav a:hover{background:#eef2ff;color:var(--accent)}
  .wrap{max-width:1180px;margin:0 auto;padding:0 20px}
  .hero{padding:64px 0 28px;display:grid;grid-template-columns:1.15fr .85fr;gap:32px;align-items:center}
  .hero h1{font-size:clamp(32px,5vw,52px);line-height:1.05;margin:0 0 16px;letter-spacing:-.03em}
  .hero h1 span{background:linear-gradient(135deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
  .hero p{font-size:17px;line-height:1.65;color:#475569;margin:0 0 22px;max-width:640px}
  .badges{display:flex;gap:10px;flex-wrap:wrap}
  .badge{
    font-size:13px;padding:8px 12px;border-radius:999px;
    background:rgba(255,255,255,.8);border:1px solid #dbeafe;color:#1d4ed8;font-weight:600;
  }
  .hero-card{
    background:linear-gradient(180deg,#0f172a,#111827);
    color:#e5e7eb;border-radius:24px;padding:26px;box-shadow:var(--shadow);
    border:1px solid rgba(255,255,255,.08);
  }
  .hero-card h3{margin:0 0 10px;font-size:18px}
  .hero-card p{margin:0;color:#cbd5e1;line-height:1.65;font-size:14px}
  .hero-metrics{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}
  .metric{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.08);border-radius:16px;padding:14px}
  .metric b{display:block;font-size:20px;color:#fff;margin-bottom:2px}
  .metric span{font-size:12px;color:#94a3b8}
  .calc{padding:28px 0 20px;display:grid;grid-template-columns:1.05fr .95fr;gap:24px;align-items:start}
  .card{
    background:var(--card);border:1px solid var(--line);border-radius:24px;
    box-shadow:0 16px 40px rgba(15,23,42,.08);
  }
  .form-card{padding:26px}
  .result-card{padding:26px;position:sticky;top:86px}
  .card h2{margin:0 0 6px;font-size:22px;letter-spacing:-.02em}
  .card .hint{margin:0 0 22px;color:var(--muted);font-size:14px;line-height:1.55}
  .grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
  .field{display:flex;flex-direction:column;gap:7px}
  .field.full{grid-column:1/-1}
  label{font-size:13px;font-weight:700;color:#334155}
  input,select{
    width:100%;padding:13px 14px;border-radius:14px;border:1px solid #cbd5e1;
    background:#fff;color:var(--text);font-size:15px;outline:none;
    transition:border .15s, box-shadow .15s;
  }
  input:focus,select:focus{border-color:var(--accent);box-shadow:0 0 0 4px rgba(37,99,235,.12)}
  .check{
    display:flex;align-items:center;gap:10px;padding:12px 14px;border:1px solid var(--line);
    border-radius:14px;background:var(--soft);font-size:14px;font-weight:600;color:#334155;
  }
  .check input{width:18px;height:18px;accent-color:var(--accent)}
  .actions{display:flex;gap:12px;margin-top:20px}
  button{
    border:0;border-radius:14px;padding:14px 18px;font-size:15px;font-weight:800;cursor:pointer;
    transition:transform .15s, box-shadow .15s, opacity .15s;
  }
  button:hover{transform:translateY(-1px)}
  .btn-primary{
    flex:1;color:#fff;background:linear-gradient(135deg,var(--accent),var(--accent-2));
    box-shadow:0 14px 28px rgba(37,99,235,.28);
  }
  .btn-ghost{background:#fff;border:1px solid #cbd5e1;color:#334155}
  .total-label{font-size:13px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
  .total{
    font-size:clamp(32px,5vw,46px);font-weight:900;letter-spacing:-.04em;line-height:1;
    background:linear-gradient(135deg,var(--accent),var(--accent-2));
    -webkit-background-clip:text;background-clip:text;color:transparent;
    margin-bottom:6px;
  }
  .total-sub{color:var(--muted);font-size:13px;margin-bottom:20px}
  table{width:100%;border-collapse:collapse;font-size:14px}
  td{padding:11px 0;border-bottom:1px solid #eef2f7;vertical-align:top}
  td:last-child{text-align:right;font-weight:700;white-space:nowrap;padding-left:16px}
  tr:last-child td{border-bottom:0}
  .total-row td{padding-top:16px;font-size:16px;color:var(--accent)}
  .note{
    margin-top:18px;padding:14px 16px;border-radius:16px;
    background:#fff7ed;border:1px solid #fed7aa;color:#9a3412;font-size:13px;line-height:1.55;
  }
  .method{padding:44px 0 56px}
  .section-title{text-align:center;margin-bottom:26px}
  .section-title h2{font-size:30px;margin:0 0 8px;letter-spacing:-.03em}
  .section-title p{margin:0;color:var(--muted)}
  .method-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
  .method-card{
    background:#fff;border:1px solid var(--line);border-radius:20px;padding:22px;
    box-shadow:0 12px 30px rgba(15,23,42,.05);
  }
  .method-card .num{
    width:34px;height:34px;border-radius:10px;background:#eef2ff;color:var(--accent);
    display:grid;place-items:center;font-weight:900;margin-bottom:14px;
  }
  .method-card h3{margin:0 0 8px;font-size:17px}
  .method-card p{margin:0;color:var(--muted);font-size:14px;line-height:1.65}
  footer{
    background:#0f172a;color:#cbd5e1;padding:34px 0;
  }
  .footer-inner{max-width:1180px;margin:0 auto;padding:0 20px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;align-items:center}
  footer a{color:#e2e8f0;text-decoration:none}
  footer a:hover{color:#fff}
  .muted{color:#94a3b8;font-size:13px}
  @media (max-width:900px){
    .hero,.calc,.method-grid{grid-template-columns:1fr}
    .result-card{position:static}
    nav{display:none}
  }
  @media (max-width:560px){
    .grid{grid-template-columns:1fr}
    .actions{flex-direction:column}
    .hero{padding-top:42px}
  }
  @media print{
    .topbar,.hero,.method,footer,.actions,.note{display:none!important}
    body{background:#fff}
    .calc{display:block;padding:0}
    .card{box-shadow:none;border:1px solid #ddd}
    .result-card{position:static;margin-top:20px}
  }