:root{
  --bg:#eef3f8;
  --card:#ffffff;
  --text:#172433;
  --muted:#607085;
  --brand:#16364f;
  --line:#d9e4ee;
  --soft:#f7fafc;
  --ok:#0f8a2d;
  --warn:#a15c00;
  --danger:#b42318;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:Arial,sans-serif;background:var(--bg);color:var(--text)}
body{min-height:100vh}
.bill-shell{max-width:640px;margin:0 auto;padding:14px}
.bill-card{background:var(--card);border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:0 10px 30px rgba(15,23,42,.06)}
.bill-head{padding:22px 18px;border-bottom:1px solid var(--line);background:linear-gradient(180deg,#fff,#f8fbfd);text-align:center}
.bill-logo{width:260px;max-width:100%;height:auto;display:block;margin:0 auto 18px auto}
.bill-title{margin:0;font-size:28px;line-height:1.05;color:var(--brand)}
.bill-sub{margin:10px auto 0 auto;font-size:14px;line-height:1.6;color:#334155;max-width:560px}
.bill-body{padding:16px 18px 18px 18px}
.bill-note{background:var(--soft);border:1px solid var(--line);border-radius:14px;padding:12px 13px;margin:0 0 14px 0;color:#475569;font-size:14px;line-height:1.55}
.bill-note strong{color:var(--brand)}
.bill-grid{display:grid;grid-template-columns:1fr;gap:12px}
.bill-field label{display:block;font-size:12px;font-weight:700;letter-spacing:.03em;text-transform:uppercase;color:#516171;margin:0 0 6px 0}
.bill-field input[type="text"],.bill-field input[type="email"],.bill-field input[type="tel"]{width:100%;height:48px;border:1px solid var(--line);border-radius:12px;padding:0 14px;font-size:16px;background:#fff;color:var(--text)}
.bill-field input:focus{outline:none;border-color:#9eb6cb;box-shadow:0 0 0 4px rgba(22,54,79,.08)}
.bill-upload{border:1px dashed #9fb4c8;border-radius:14px;padding:14px;background:#fcfdff}
.bill-upload-title{font-size:14px;font-weight:700;color:var(--brand);margin:0 0 6px 0}
.bill-upload-help{margin:0 0 10px 0;font-size:13px;line-height:1.5;color:var(--muted)}
.bill-upload input[type="file"]{display:block;width:100%;font-size:14px}
.bill-help{display:block;margin-top:6px;font-size:12px;line-height:1.5;color:var(--muted)}
.bill-check{display:flex;gap:10px;align-items:flex-start;background:#fbfdff;border:1px solid var(--line);border-radius:12px;padding:12px}
.bill-check input{margin-top:3px}
.bill-check label{font-size:13px;line-height:1.55;color:#334155}
.bill-check a{color:var(--brand);font-weight:700}
.bill-actions{display:flex;flex-direction:column;gap:10px;margin-top:4px}
.bill-btn{display:inline-flex;justify-content:center;align-items:center;min-height:50px;padding:0 16px;border-radius:12px;border:0;background:var(--brand);color:#fff;text-decoration:none;font-size:16px;font-weight:700;cursor:pointer}
.bill-btn:disabled{opacity:.55;cursor:not-allowed}
.bill-foot{padding:0 18px 18px 18px;color:var(--muted);font-size:12px;line-height:1.6}
.bill-msg{border-radius:12px;padding:12px 13px;margin:0 0 14px 0;font-size:14px;line-height:1.55;border:1px solid var(--line)}
.bill-msg.ok{background:#eef9f1;color:#155724;border-color:#cfead6}
.bill-msg.err{background:#fff1f1;color:#8e2323;border-color:#f0c9c9}
.bill-meta-list{margin:0;padding-left:18px}
.bill-meta-list li{margin:0 0 6px 0}
.bill-tight{max-width:560px}
@media(min-width:860px){.bill-shell{max-width:700px;padding:24px}.bill-tight{max-width:620px}.bill-title{font-size:30px}.bill-head,.bill-body,.bill-foot{padding-left:22px;padding-right:22px}}