:root{--primary: #1890ff;--success: #52c41a;--danger: #ff4d4f;--text: #333;--text-secondary: #666;--bg: #f5f5f5;--card-bg: #fff;--radius: 8px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.5;-webkit-font-smoothing:antialiased}.container{max-width:480px;margin:0 auto;min-height:100vh;background:var(--card-bg)}.page{padding:20px;min-height:100vh}.header{text-align:center;padding:30px 20px;background:linear-gradient(135deg,var(--primary),#722ed1);color:#fff}.header h1{font-size:24px;margin-bottom:8px}.header p{font-size:14px;opacity:.9}.card{background:var(--card-bg);border-radius:var(--radius);padding:20px;margin-bottom:16px;box-shadow:0 2px 8px #0000000f}.btn{display:block;width:100%;padding:14px;border:none;border-radius:var(--radius);font-size:16px;font-weight:500;cursor:pointer;transition:all .2s}.btn-primary{background:var(--primary);color:#fff}.btn-primary:active{opacity:.8;transform:scale(.98)}.btn-success{background:var(--success);color:#fff}.btn-danger{background:var(--danger);color:#fff}.input{width:100%;padding:12px 16px;border:1px solid #ddd;border-radius:var(--radius);font-size:16px;margin-bottom:16px}.input:focus{outline:none;border-color:var(--primary)}.result{padding:16px;border-radius:var(--radius);text-align:center;margin-bottom:16px}.result.success{background:#f6ffed;border:1px solid #b7eb8f;color:var(--success)}.result.error{background:#fff2f0;border:1px solid #ffccc7;color:var(--danger)}.qr-container{text-align:center;padding:20px}.qr-container canvas,.qr-container img{max-width:100%}.tips{text-align:center;color:var(--text-secondary);font-size:14px;margin-top:16px}