* { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'Noto Sans TC', sans-serif; background: linear-gradient(135deg, #8458b3 0%, #d0bdf4 100%); min-height: 100vh; display: flex; align-items: center; justify-content: center; }
        
        .container { background: white; border-radius: 20px; padding: 40px; width: 100%; max-width: 400px; box-shadow: 0 10px 40px rgba(0,0,0,0.2); }
        h1 { color: #8458b3; text-align: center; margin-bottom: 30px; font-size: 28px; }
        
        .form-group { margin-bottom: 20px; }
        .form-group label { display: block; margin-bottom: 8px; color: #494d5f; font-weight: 500; }
        .form-group input { width: 100%; padding: 12px 15px; border: 2px solid #e5eaf5; border-radius: 10px; font-size: 16px; transition: border-color 0.3s; }
        .form-group input:focus { outline: none; border-color: #8458b3; }
        
        .btn { width: 100%; padding: 14px; background: #8458b3; color: white; border: none; border-radius: 10px; font-size: 16px; font-weight: 600; cursor: pointer; transition: background 0.3s; }
        .btn:hover { background: #6b4a8f; }
        
        .links { text-align: center; margin-top: 20px; }
        .links a { color: #8458b3; text-decoration: none; font-size: 14px; }
        .links a:hover { text-decoration: underline; }
        
        .message { padding: 12px; border-radius: 8px; margin-bottom: 20px; text-align: center; }
        .message.error { background: #fee; color: #c00; }
        .message.success { background: #efe; color: #060; }
        
        .tabs { display: flex; margin-bottom: 25px; border-bottom: 2px solid #e5eaf5; }
        .tab { flex: 1; padding: 12px; text-align: center; cursor: pointer; color: #999; font-weight: 500; }
        .tab.active { color: #8458b3; border-bottom: 2px solid #8458b3; margin-bottom: -2px; }
        
        .tab-content { display: none; }
        .tab-content.active { display: block; }