:root {
    --primary-color: #4a5568;
    --secondary-color: #718096;
    --accent-color: #4299e1;
    --error-color: #e53e3e;
    --background-color: #f7fafc;
    --input-background: #edf2f7;
    --text-color: #2d3748;
    --border-color: #e2e8f0;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft JhengHei', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    color: var(--text-color);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-image 0.3s ease;
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-box {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 35%);
    padding: 2rem;
    margin-bottom: 1rem;
}

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.logo {
    height: 70px;
    /* margin-bottom: 1rem; */
}

.login-header h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 600;
}

.form-group {
    margin-bottom: 1.5rem;
}

.input-icon {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon i {
    position: absolute;
    left: 1rem;
    color: var(--secondary-color);
    font-size: 1.1rem;
}

.input-icon input {
    width: 100%;
    padding: 0.75rem 1rem 0.75rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--input-background);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.input-icon input:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.15);
}

.input-icon input::placeholder {
    color: var(--secondary-color);
}

.login-button {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--accent-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.login-button:hover {
    background-color: #3182ce;
    transform: translateY(-1px);
}

.login-button:active {
    transform: translateY(0);
}

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

.login-button:hover i {
    transform: translateX(4px);
}

.error-message {
    background-color: #fff5f5;
    color: var(--error-color);
    padding: 0.75rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
}

.browser-notice {
    text-align: center;
    color: var(--secondary-color);
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.browser-notice i {
    color: var(--error-color);
}

@media (max-width: 480px) {
    .login-container {
        padding: 1rem;
    }
    
    .login-box {
        padding: 1.5rem;
    }
}