:root {
    --primary-color: #4E86BB;
    --secondary-color: #A0D1F1;
    --background-color: #F2F2F2;
    --text-color: #2F4858;
    --error-color: #FF6B6B;
    --success-color: #4CAF50;
    --input-bg: #FFFFFF;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Microsoft JhengHei', Arial, sans-serif;
}

body {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.login-container {
	 display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    max-width: 300px;
    padding: 20px;
}

.login-box {
    background: rgba(255, 255, 255, 0.95);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.login-header {
    text-align: center;
    margin-bottom: 40px;
}

.login-header i {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.login-header h1 {
    color: var(--text-color);
    font-size: 24px;
    margin-bottom: 10px;
}

.login-header p {
    color: #666;
    font-size: 14px;
}

.form-group {
    position: relative;
    margin-bottom: 30px;
}

.form-group i {
    position: absolute;
    left: 10px;
    top: 12px;
    color: #ccc;
}

.form-group input {
    width: 100%;
    padding: 10px 0 10px 30px;
    font-size: 16px;
    color: var(--text-color);
    border: 1px solid #ddd; 
    border-radius: 5px;
    background: transparent;
    transition: all 0.3s ease;
}

.form-group label {
    position: absolute;
    left: 30px;
    top: 10px;
    font-size: 16px;
    color: #999;
    pointer-events: none;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group input:valid {
    border-bottom-color: var(--primary-color);
}

.form-group input:focus ~ label,
.form-group input:valid ~ label {
    top: -20px;
    font-size: 12px;
    color: var(--primary-color);
}

.error-message {
    color: var(--error-color);
    font-size: 14px;
    text-align: center;
    margin-bottom: 20px;
    min-height: 20px;
}

label[for="username"] {
    color: var(--secondary-color); 
}

.login-image {
    width: 100%;  
    height: auto; 
    margin-bottom: 20px; 
}

.login-button {
    width: 100%;
    padding: 16px 0;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    transition: all 0.3s ease;
}

.login-button:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
}

.login-button i {
    transition: transform 0.3s ease;
}

.login-button:hover i {
    transform: translateX(5px);
}

/* 響應式設計 */
@media (max-width: 480px) {
    .login-container {
        padding: 10px;
    }
    
    .login-box {
        padding: 30px 20px;
    }
    
    .login-header h1 {
        font-size: 20px;
    }
}