:root{--accent: #0d9488;--overlay: rgba(15, 23, 42, .45);--text: #0f172a;--muted: #94a3b8;--surface: #f8f9fa;--border: #e2e8f0;--white: #ffffff;--danger: #dc2626;--success: #16a34a;--modal-max-width: 740px}*{box-sizing:border-box}html,body{margin:0;height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;color:var(--text);background:var(--overlay);overflow:hidden}.page{min-height:100%;min-height:100dvh;display:flex;align-items:center;justify-content:center;padding:16px;padding-top:max(16px,env(safe-area-inset-top));padding-bottom:max(16px,env(safe-area-inset-bottom))}.modal{position:relative;width:calc(100% - 32px);max-width:var(--modal-max-width);background:var(--white);border-radius:28px;box-shadow:0 25px 50px -12px #0f172a40;padding:28px 24px 32px;overflow:hidden}.close-btn{position:absolute;top:28px;right:24px;width:24px;height:24px;padding:0;border:none;background:transparent;color:#94a3b8;cursor:pointer;display:inline-flex;align-items:center;justify-content:center}.close-btn:hover{color:#475569}.close-btn svg{width:20px;height:20px}.modal-title{margin:0 40px 24px;text-align:center;font-size:20px;font-weight:600;line-height:1.4;color:var(--text)}.canvas-wrap{position:relative;overflow:hidden;border-radius:12px;background:var(--surface)}#signatureCanvas{display:block;width:100%;height:280px;touch-action:none;cursor:crosshair}.canvas-placeholder{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;pointer-events:none;color:var(--muted);font-size:14px;text-align:center;padding:0 16px}.canvas-placeholder[hidden]{display:none}.actions{margin-top:20px;display:flex;align-items:center;justify-content:flex-end;gap:12px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:44px;padding:0 20px;border-radius:999px;font-size:16px;font-weight:500;line-height:1;cursor:pointer;border:1px solid var(--border);background:var(--white);color:#334155;transition:background-color .15s ease}.btn:hover:not(:disabled){background:#f8fafc}.btn:disabled{opacity:.6;cursor:not-allowed}.btn svg{width:16px;height:16px;flex-shrink:0;color:#94a3b8}.btn-primary{border-color:transparent;background:var(--accent);color:#fff;min-width:96px;padding-inline:32px}.btn-primary:hover:not(:disabled){filter:brightness(.96);background:var(--accent)}.status{margin-top:14px;min-height:20px;text-align:center;font-size:14px;line-height:1.5}.status.error{color:var(--danger)}.status.success{color:var(--success)}.modal-workspace[hidden]{display:none}.modal--success{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:120px;padding:48px 24px;text-align:center}.modal--success .status{width:100%;margin:0;padding:0;text-align:center;font-size:16px;line-height:1.7}.loading-overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#ffffffb8;border-radius:28px;z-index:2}.loading-overlay[hidden]{display:none}.loading-spinner{width:28px;height:28px;border:2px solid rgba(13,148,136,.2);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@media(min-width:480px){#signatureCanvas{height:320px}.modal{padding:28px 32px 32px}.close-btn{right:28px}}