/* ログイン画面スタイル */
.login-screen {
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.login-container {
    background: white;
    border-radius: 20px;
    padding: 3rem;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

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

.login-header i {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.login-header h1 {
    font-size: 2rem;
    color: #333;
    margin-bottom: 0.5rem;
}

.login-header p {
    color: #666;
    font-size: 1rem;
}

.login-form {
    text-align: left;
}

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

.login-form label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #555;
}

.login-form input {
    width: 100%;
    padding: 1rem;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.login-form input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.login-btn {
    width: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 1rem;
}

.login-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

@media (max-width: 480px) {
    .login-container {
        padding: 2rem;
        margin: 1rem;
    }
    
    .login-header h1 {
        font-size: 1.5rem;
    }
}