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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #fafafa;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #333;
}

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

.login-form {
    background: #ffffff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    padding: 40px 30px;
    text-align: center;
}

h1 {
    font-size: 24px;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.subtitle {
    color: #7f8c8d;
    font-size: 14px;
    margin-bottom: 30px;
}

.error-message {
    background: #fff5f5;
    border: 1px solid #fed7d7;
    color: #c53030;
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 14px;
}

.error-message .material-icons {
    font-size: 18px;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: #4a5568;
    margin-bottom: 6px;
}

input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    font-size: 16px;
    transition: border-color 0.2s ease;
    background: #ffffff;
}

input[type="text"]:focus,
input[type="password"]:focus {
    outline: none;
    border-color: #4299e1;
    box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.1);
}

.login-btn {
    width: 100%;
    background: #4299e1;
    color: white;
    border: none;
    padding: 14px 20px;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 10px;
}

.login-btn:hover {
    background: #3182ce;
}

.login-btn:active {
    transform: translateY(1px);
}

.login-btn .material-icons {
    font-size: 20px;
}

/* モバイル対応 */
@media (max-width: 480px) {
    .login-container {
        padding: 10px;
    }
    
    .login-form {
        padding: 30px 20px;
    }
    
    h1 {
        font-size: 22px;
    }
}