/* Custom Properties for Colors (from your style.css) */
:root {
    --color-dark: #5A827E;   /* Dark Teal */
    --color-medium: #84AE92; /* Medium Green */
    --color-light: #B9D4AA;  /* Light Green */
    --color-accent: #FAFFCA; /* Very Light Yellow / Cream */
    --text-color-dark: #333;
    --text-color-light: #FAFFCA;
}

body {
    font-family: 'Open Sans', 'Segoe UI', sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--color-accent);
    color: var(--text-color-dark);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    line-height: 1.6;
}

.login-container {
    background-color: var(--color-light);
    padding: 2.5rem 3rem;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
    width: 100%;
    max-width: 450px;
    text-align: center;
}

header h1 {
    color: var(--color-dark);
    font-family: 'Fira Code', monospace;
    font-size: 2em;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--color-dark);
}

.form-group input {
    width: calc(100% - 20px); /* Account for padding */
    padding: 10px;
    border: 2px solid var(--color-medium);
    border-radius: 8px;
    font-size: 1em;
    font-family: 'Open Sans', sans-serif;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-dark);
    box-shadow: 0 0 8px rgba(90, 130, 126, 0.3);
}

button[type="submit"] {
    background-color: var(--color-dark);
    color: var(--text-color-light);
    font-family: 'Open Sans', sans-serif;
    font-weight: 600;
    font-size: 1.1em;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 30px; /* Pill shape */
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    display: inline-block;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

button[type="submit"]:hover {
    background-color: var(--color-medium);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

.error-message {
    color: #D8000C; /* Standard error red */
    background-color: #FFD2D2; /* Light red background */
    border: 1px solid #D8000C;
    padding: 10px;
    border-radius: 5px;
    margin-top: 1rem;
    display: none; /* Hidden by default */
}

footer {
    margin-top: 2rem;
    font-size: 0.9em;
    color: var(--color-dark);
}