*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,PingFang SC,sans-serif;background:#f5f5f5;color:#2d2d2d}.admin-container{max-width:900px;margin:0 auto;padding:20px}.admin-nav{display:flex;gap:16px;padding:16px 0;border-bottom:1px solid #e0e0e0;margin-bottom:20px}.admin-nav a{text-decoration:none;color:#666;font-size:15px}.admin-nav a.active{color:#ff6b6b;font-weight:600}.card{background:#fff;border-radius:12px;padding:20px;margin-bottom:16px;box-shadow:0 1px 4px #0000000d}.btn{padding:10px 20px;border-radius:8px;border:none;font-size:14px;cursor:pointer}.btn-primary{background:#ff6b6b;color:#fff}.btn-secondary{background:#f0f0f0;color:#333}.input{padding:10px 12px;border:1px solid #e0e0e0;border-radius:8px;font-size:14px;width:100%;margin-bottom:12px}table{width:100%;border-collapse:collapse}th,td{padding:10px;text-align:left;border-bottom:1px solid #f0f0f0;font-size:13px}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center}.login-card{background:#fff;padding:40px;border-radius:12px;text-align:center}.tag-status{padding:2px 8px;border-radius:10px;font-size:12px}.tag-unused{background:#e3f2fd;color:#1976d2}.tag-used{background:#e8f5e9;color:#388e3c}.tag-disabled{background:#ffebee;color:#d32f2f}.code-list{font-family:monospace;font-size:13px}