:root {
    --primary-color: #0073aa; /* A professional blue for consistency */
    --primary-hover: #005a87;
    --success-color: #46b450;
    --danger-color: #dc3232;
    --light-gray: #f0f2f5; /* Use a slightly softer background */
    --medium-gray: #dcdcde;
    --dark-gray: #555d66;
    --text-color: #2c3338;
    --white-color: #fff;
    --border-radius: 8px;
    --box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}

.auth-page-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh; /* Use 100vh for full viewport height centering */
    background-color: var(--light-gray);
    padding: 20px;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
}

.auth-card {
    max-width: 420px;
    width: 100%;
    background-color: var(--white-color);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.auth-header {
    text-align: center;
    padding: 30px 20px;
    border-bottom: 1px solid var(--light-gray);
}

.school-logo {
    max-width: 70px;
    margin-bottom: 15px;
}

.school-name {
    margin: 0;
    font-size: 22px;
    color: var(--primary-color);
}

.auth-title {
    margin: 10px 0 0;
    font-size: 16px;
    font-weight: 500;
    color: var(--dark-gray);
}

.auth-body {
    padding: 30px;
}

.auth-notice {
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 5px;
    border-left: 5px solid;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.auth-notice.error {
    background-color: #f8d7da;
    border-color: var(--danger-color);
    color: #721c24;
}

.auth-notice.success {
    background-color: #d4edda;
    border-color: var(--success-color);
    color: #155724;
}

form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    margin: 0;
}

.form-group label {
    display: block;
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: 8px;
    font-size: 14px;
}

.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="text"] {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--medium-gray);
    border-radius: 5px;
    font-size: 16px;
    box-sizing: border-box;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 115, 170, 0.2);
}

.captcha-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.captcha-image {
    border-radius: 5px;
    border: 1px solid var(--medium-gray);
    flex-shrink: 0;
}

.captcha-refresh {
    font-size: 20px;
    color: var(--dark-gray);
    cursor: pointer;
    transition: color 0.2s;
}

.captcha-refresh:hover {
    color: var(--primary-color);
}

.btn-submit {
    width: 100%;
    padding: 14px;
    background-color: var(--primary-color);
    color: var(--white-color);
    border: none;
    border-radius: 5px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-submit:hover {
    background-color: var(--primary-hover);
}

.auth-footer {
    text-align: center;
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px solid var(--light-gray);
}

.auth-footer p {
    margin: 8px 0;
    font-size: 14px;
    color: var(--dark-gray);
}

.auth-footer a {
    color: var(--primary-color);
    font-weight: 600;
    text-decoration: none;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* Specific color for teacher login button */
.teacher-login .btn-submit {
    background-color: #27ae60; /* Green */
}
.teacher-login .btn-submit:hover {
    background-color: #229954;
}