:root{--bg:#f6f7fb;--card:#ffffff;--ink:#111827;--muted:#64748b;--gold:#b45309;--blue:#1d4ed8;--orange:#ee4d2d;--line:#e2e8f0}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;line-height:1.6}
a{color:var(--blue)}header{max-width:1080px;margin:auto;padding:16px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}
.logo{font-weight:900;font-size:20px;color:var(--ink);text-decoration:none}nav{display:flex;gap:14px;flex-wrap:wrap;font-size:14px}nav a{text-decoration:none;color:var(--muted)}nav a:hover{color:var(--ink)}
.hero{max-width:1080px;margin:24px auto;padding:28px 24px;background:#fff;border:1px solid var(--line);border-radius:20px;display:grid;grid-template-columns:1.4fr 1fr;gap:20px;align-items:center}
@media(max-width:800px){.hero{grid-template-columns:1fr}}
.hero h1{font-size:clamp(28px,5vw,42px);line-height:1.2;margin:0 0 10px}
.hero p{color:var(--muted);max-width:680px;margin:0 0 14px}
.tool{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;max-width:1080px;margin:0 auto 20px;box-shadow:0 4px 16px rgba(15,23,42,.06)}
.tool label{display:block;font-size:13px;color:var(--muted);margin:12px 0 4px}
.tool input,.tool select{width:100%;min-height:48px;padding:10px 12px;border-radius:10px;border:1px solid var(--line);background:#fff;color:var(--ink);font-size:16px}
.tool .row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media(max-width:640px){.tool .row{grid-template-columns:1fr}}
button{cursor:pointer;min-height:48px;padding:12px 20px;border:0;border-radius:999px;background:var(--blue);color:#fff;font-weight:800;font-size:16px;margin-top:16px}
button:focus-visible,input:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid #93c5fd;outline-offset:2px}
.result{margin-top:16px;background:#eff6ff;border:1px solid #bfdbfe;border-radius:12px;padding:16px;display:none}
.result.show{display:block}
.result .big{font-size:22px;font-weight:800;color:var(--gold)}
.err{color:#dc2626;font-size:14px;min-height:20px;margin-top:8px}
.grid{max-width:1080px;margin:auto;padding:0 20px 30px;display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:800px){.grid{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:0 4px 16px rgba(15,23,42,.05);display:flex;flex-direction:column}
.card h3{margin:0 0 6px;font-size:19px}.card p{color:var(--muted);font-size:14px;flex:1}
.disc{max-width:1080px;margin:auto;padding:0 20px 20px;color:var(--muted);font-size:13px}
footer{max-width:1080px;margin:auto;padding:20px;color:var(--muted);font-size:13px;border-top:1px solid var(--line)}
.chip{display:inline-block;background:#eff6ff;border:1px solid #bfdbfe;border-radius:999px;padding:4px 10px;font-size:12px;margin:2px;color:#1e40af}
table{width:100%;border-collapse:collapse}th,td{border:1px solid var(--line);padding:8px;text-align:left;font-size:14px}
.btn-more{display:inline-block;min-height:44px;line-height:44px;padding:0 18px;border-radius:999px;background:var(--gold);color:#fff;font-weight:800;text-decoration:none;margin-top:12px;cursor:pointer;border:0;text-align:center}
.ad-banner{background:#fff7ed;border:1px solid #fed7aa;border-radius:16px;padding:20px;max-width:1080px;margin:0 auto 20px}
.ad-banner b{font-size:18px}
.ad-card{background:linear-gradient(135deg,#fff7ed,#ffedd5);border:1px solid #fdba74;border-radius:16px;padding:20px;max-width:1080px;margin:0 auto 20px}
.shopee-btn{display:inline-block;background:var(--orange);color:#fff;text-decoration:none;font-weight:800;padding:14px 22px;border-radius:999px;margin-top:12px}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.6);display:none;align-items:center;justify-content:center;z-index:99;padding:16px}
.modal.open{display:flex}
.modal-card{background:#fff;color:#111827;border-radius:16px;max-width:420px;width:100%;padding:20px;text-align:center}
.modal-card .ad-tag{display:inline-block;background:#ef4444;color:#fff;font-size:12px;font-weight:800;padding:4px 10px;border-radius:999px}
.modal-card a.shopee-btn{display:block;background:#ee4d2d;color:#fff;text-decoration:none;font-weight:800;padding:14px;border-radius:999px;margin:14px 0 8px}
.modal-card button.continue{background:#111827;color:#fff}
.modal-card button.close-x{background:transparent;color:#111827;border:1px solid #cbd5e1;margin-left:8px}