:root {
    --primary-color: #007bff;
    --background-color: #f4f7f9;
    --text-color: #333;
    --border-color: #e0e0e0;
    --error-color: #dc3545;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.login-container {
    background: #fff;
    padding: 2rem 2.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 380px;
    text-align: center;
}

h2 {
    margin-top: 0;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
    font-weight: 600;
}

.flash-error, .flash-message {
    padding: 0.75rem 1rem;
    margin-bottom: 1rem;
    border-radius: 4px;
    border: 1px solid transparent;
    font-size: 0.9em;
}

.flash-error, .flash- {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

form input {
    width: 100%;
    padding: 12px 15px;
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 1rem;
    transition: border-color 0.2s;
}

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

.submit-btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 4px;
    background-color: var(--primary-color);
    color: white;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s;
}

.submit-btn:hover {
    background-color: #0056b3;
}