:root {
    --primary-color: #4A90E2;
    --secondary-color: #5D6494;
    --accent-color: #00F0FF;
    --dark-bg: #1A1B2E;
    --card-bg: rgba(30, 32, 54, 0.95);
    --text-color: #FFFFFF;
    --input-bg: rgba(255, 255, 255, 0.05);
}

html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    overflow-x: hidden;
}

.cyberpunk-bg {
    background: var(--dark-bg);
    min-height: 100vh;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 320px;
}

.cyberpunk-card {
    background: var(--card-bg);
    border-radius: 20px;
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    padding: 40px 30px;
    width: 100%;
    box-sizing: border-box;
}

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

.cyber-header h1 {
    color: var(--text-color);
    font-size: 2.5em;
    font-weight: 700;
    letter-spacing: 2px;
    margin: 0;
    text-transform: uppercase;
}

.cyber-header h1::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--primary-color);
    margin: 15px auto 0;
    border-radius: 3px;
}

.cyber-input-group {
    position: relative;
    margin-bottom: 25px;
    width: 100%;
    max-width: 240px;
    margin-left: auto;
    margin-right: auto;
}

.cyber-input {
    width: 100%;
    padding: 12px 15px;
    background: var(--input-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color 0.3s ease;
    box-sizing: border-box;
}

.cyber-input:focus {
    border-color: var(--primary-color);
    outline: none;
}

.cyber-input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.cyber-button {
    width: 100%;
    max-width: 240px;
    padding: 15px;
    background: var(--primary-color);
    border: none;
    border-radius: 10px;
    color: var(--text-color);
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    cursor: pointer;
    transition: background-color 0.3s ease;
    display: block;
    margin: 0 auto;
}

.cyber-button:hover {
    background: #357ABD;
}

/* 響應式設計 */
@media (max-width: 360px) {
    .login-container {
        width: 100%;
        padding: 0 20px;
    }

    .cyberpunk-card {
        padding: 30px 20px;
    }

    .cyber-header h1 {
        font-size: 2em;
    }

    .cyber-input {
        padding: 10px 12px;
    }
}

.error-message {
    background: rgba(255, 0, 0, 0.1);
    border: 1px solid rgba(255, 0, 0, 0.3);
    color: #ff4444;
    padding: 10px;
    border-radius: 8px;
    margin-bottom: 20px;
    text-align: center;
    font-size: 0.9rem;
}