:root{
  --bg:#f6f8fa;
  --card:#ffffff;
  --accent:#0b5cff;
  --muted:#6b7280;
}
*{box-sizing:border-box}
body{font-family:Inter,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);margin:0;min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}
.card{width:100%;max-width:720px;background:var(--card);padding:28px;border-radius:12px;box-shadow:0 6px 20px rgba(9,30,66,0.08);text-align:center}
h1{margin:0 0 8px;font-size:28px}
.lead{margin:0 0 18px;color:var(--muted)}
.upload-form{display:flex;flex-direction:column;gap:16px;align-items:center}
.file-label{display:inline-block;padding:10px 14px;border-radius:8px;border:1px dashed #d1d5db;cursor:pointer;color:#111}
.file-label input{display:none}
.actions{display:flex;gap:8px}
.btn{background:var(--accent);color:#fff;padding:10px 16px;border-radius:8px;border:0;cursor:pointer}
.btn.disabled{background:#cbd5e1;color:#6b7280;cursor:default}
.btn.enabled{background:var(--accent);color:#fff}
.muted{color:var(--muted);margin-top:18px;font-size:13px}

.msg-error{color:#b91c1c}
.msg-success{color:#065f46}