:root{
  --brand:#0ea5a4; --brand-dark:#0b7d7c; --ink:#0f172a; --muted:#64748b;
  --bg:#f1f5f9; --card:#ffffff; --line:#e2e8f0; --ok:#16a34a; --warn:#d97706;
  --danger:#dc2626; --blue:#2563eb;
}
*{box-sizing:border-box}
body{margin:0;font-family:"Segoe UI","PingFang TC","Microsoft JhengHei",sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.6;font-size:18px}
a{color:var(--brand-dark)}
.nav{background:var(--brand);color:#fff;padding:16px 30px;display:flex;
  justify-content:space-between;align-items:center;box-shadow:0 2px 8px rgba(0,0,0,.08)}
.nav h1{font-size:24px;margin:0}
.nav a{color:#fff;text-decoration:none;opacity:.9;font-size:16px;margin-left:18px}
.nav a:hover{opacity:1;text-decoration:underline}
.wrap{max-width:1040px;margin:30px auto;padding:0 24px}
.hero{text-align:center;margin-bottom:24px}
.hero h2{font-size:32px;margin:0 0 6px}
.hero p{color:var(--muted);margin:0;font-size:17px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;
  padding:26px;box-shadow:0 1px 3px rgba(0,0,0,.04);margin-bottom:22px}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media(max-width:640px){.grid{grid-template-columns:1fr}}
label{display:block;font-size:15px;font-weight:600;color:var(--muted);margin-bottom:6px}
input,select,textarea{width:100%;padding:12px 14px;border:1px solid var(--line);
  border-radius:9px;font-size:17px;font-family:inherit;background:#fff;color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand);
  box-shadow:0 0 0 3px rgba(14,165,164,.15)}
textarea{resize:vertical;min-height:72px}
.type-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px}
@media(max-width:900px){.type-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:640px){.type-grid{grid-template-columns:1fr 1fr}}
.type-opt{border:2px solid var(--line);border-radius:12px;padding:18px 10px;text-align:center;
  cursor:pointer;transition:.15s;background:#fff}
.type-opt:hover{border-color:var(--brand)}
.type-opt.sel{border-color:var(--brand);background:#ecfeff}
.type-opt .ic{font-size:30px}
.type-opt .nm{font-weight:700;font-size:16.5px;margin-top:6px}
.type-opt .pr{font-size:13.5px;color:var(--muted)}
.btn{background:var(--brand);color:#fff;border:none;padding:14px 26px;border-radius:10px;
  font-size:18px;font-weight:700;cursor:pointer;transition:.15s}
.btn:hover{background:var(--brand-dark)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn-block{width:100%}
.estimate{background:linear-gradient(135deg,#0ea5a4,#0b7d7c);color:#fff;border-radius:12px;
  padding:22px 26px;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px}
.estimate .amt{font-size:36px;font-weight:800}
.estimate .lab{font-size:14.5px;opacity:.9}
.success{background:#ecfdf5;border:1px solid #86efac;color:#065f46;border-radius:12px;
  padding:28px;text-align:center}
.success h3{margin:0 0 8px;font-size:24px}
.success .code{font-size:26px;font-weight:800;color:var(--ok)}
.muted{color:var(--muted);font-size:14px}
.hint{font-size:13px;color:var(--muted);margin-top:4px}

/* ===== 行動裝置共用 ===== */
@media(max-width:760px){
  body{font-size:16px}
  .nav{flex-wrap:wrap;gap:8px 12px;padding:12px 16px}
  .nav h1{font-size:20px}
  .nav > div{flex-wrap:wrap;gap:8px}
  .nav a{margin-left:0}
  .wrap{padding:0 14px;margin:18px auto}
  .hero h2{font-size:25px}
  .card{padding:18px}
  .grid{gap:14px}
  .btn{font-size:17px;padding:13px 20px}
  .type-grid{grid-template-columns:1fr 1fr}
  .estimate{padding:18px 18px}
  .estimate .amt{font-size:30px}
}