:root {
    --primary-color: #2980b9;
    --error-color: #e74c3c;
    --text-color: #34495e;
    --border-color: #bdc3c7;
    --background-color: #f9f9f9;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    background: var(--background-color);
    color: var(--text-color);
}

.container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

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

.login-screen {
    background-color: #fff;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.logo {
    display: block;
    max-width: 200px;
    height: auto;
    margin: 0 auto 2rem;
}

.login-screen h1 {
    text-align: center;
    font-size: 1.8rem;
    color: var(--primary-color);
    margin-bottom: 2rem;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.login-field {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.login-field:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn {
    background: var(--primary-color);
    color: white;
    padding: 0.8rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.btn:hover {
    background: #2573a7;
}

.login-link {
    text-align: center;
    margin-top: 1rem;
}

.login-link a {
    color: var(--primary-color);
    text-decoration: none;
}

.login-link a:hover {
    text-decoration: underline;
}

.alert {
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.alert-danger {
    background-color: #fde8e8;
    color: var(--error-color);
    border: 1px solid #fbd5d5;
}

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