body{font-family:system-ui,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:#f6f7fb;color:#111;margin:0}
.container{max-width:960px;margin:36px auto;background:#fff;border-radius:16px;box-shadow:0 10px 30px rgba(0,0,0,.08);overflow:hidden}
.header{display:flex;gap:12px;align-items:center;padding:16px 20px;border-bottom:1px solid #eee}
.header img{height:36px}
.header h1{margin:0;font-size:18px}
.content{padding:20px}
.row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.input{width:90%;padding:10px;border:1px solid #ddd;border-radius:10px}
.label{font-weight:600;margin:10px 0 6px}
.btn{display:inline-block;background:#2563eb;color:#fff;padding:10px 16px;border:0;border-radius:10px;text-decoration:none;font-weight:700}
.btn.gray{background:#6b7280}
.small{font-size:12px;color:#64748b}
.pdf-frame{width:100%;height:70vh;border:1px solid #e5e7eb;border-radius:12px}
.tabs{display:flex;gap:8px;margin:6px 0 10px}
.tab{padding:8px 12px;border:1px solid #ddd;border-radius:10px;cursor:pointer;background:#fafafa}
.tab.active{background:#2563eb;color:#fff;border-color:#2563eb}
.sig-pane{display:none}
.canvas-wrap{border:1px dashed #ccc;border-radius:12px;height:180px;background:#fff;display:flex;align-items:center;justify-content:center}
.notice{background:#0ea5e9;color:#fff;padding:12px;border-radius:10px}
.footer{padding:18px;background:#fafafa;border-top:1px solid #eee;text-align:right}