body {
    font-family: 'Poppins', sans-serif;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background: linear-gradient(135deg, #101517 0%, #1a2529 100%);
    color: white;
}

.login-container, .dashboard-container {
    background: rgba(255, 255, 255, 0.95);
    padding: 2.5rem;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 420px;
    color: #333;
    animation: fadeIn 0.5s ease-in-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

.main-title {
    text-align: center;
    color: white;
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
}

.logo-img {
    display: block;
    margin: 0 auto;
    width: 150px;
    height: auto;
    margin-bottom: 1.5rem;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

h2 {
    text-align: center;
    margin-bottom: 0.5rem;
    color: #222;
    font-weight: 600;
}

.subtitle {
    text-align: center;
    color: #666;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.form-group {
    margin-bottom: 1.2rem;
}

label {
    display: block;
    margin-bottom: 0.4rem;
    color: #444;
    font-size: 0.95rem;
}

.input-with-icon {
    display: flex;
    align-items: center;
    gap: 0.7rem;
}

.input-icon {
    color: #666;
    font-size: 1.5rem;
    width: 2rem;
    text-align: center;
}

input {
    width: 100%;
    padding: 0.9rem;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 8px rgba(0, 123, 255, 0.2);
}

button {
    width: 100%;
    padding: 0.9rem;
    background: linear-gradient(90deg, #007bff, #00c4ff);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 123, 255, 0.3);
}

.error {
    color: #e63946;
    margin-bottom: 1rem;
    text-align: center;
    font-size: 0.9rem;
    background: rgba(230, 57, 70, 0.1);
    padding: 0.5rem;
    border-radius: 4px;
}

.nav-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1.5rem;
}

.nav-btn {
    display: inline-block;
    padding: 0.75rem;
    background: linear-gradient(90deg, #28a745, #34c759);
    color: white;
    text-decoration: none;
    text-align: center;
    border-radius: 8px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.nav-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.3);
}

.logout-button {
    display: inline-block;
    padding: 0.75rem;
    background: #dc3545;
    color: white;
    text-decoration: none;
    text-align: center;
    border-radius: 8px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.logout-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(220, 53, 69, 0.3);
}

.dashboard-container {
    max-width: 600px;
}

.links-list {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem 0;
}

.category {
    margin-bottom: 1rem;
}

.category-toggle {
    display: none;
}

.category-title {
    display: block;
    padding: 0.8rem;
    background: rgba(0, 123, 255, 0.1);
    color: #007bff;
    text-decoration: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

.category-title:hover {
    background: rgba(0, 123, 255, 0.2);
}

.category-title i {
    margin-right: 0.5rem;
}

.category-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    padding-left: 1rem;
}

.category-toggle:checked ~ .category-content {
    max-height: 500px; /* Adjust based on content */
}

.link-item {
    display: block;
    padding: 0.8rem;
    background: rgba(0, 123, 255, 0.05);
    color: #007bff;
    text-decoration: none;
    border-radius: 8px;
    font-size: 1rem;
    transition: background 0.3s, transform 0.2s;
    margin-bottom: 0.8rem;
}

.link-item:hover {
    background: rgba(0, 123, 255, 0.1);
    transform: translateX(5px);
}

.quiz-description {
    display: block;
    font-size: 0.85rem;
    color: #666;
    margin-top: 0.3rem;
}

.no-quizzes {
    text-align: center;
    color: #666;
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

.quiz-body {
    background: linear-gradient(135deg, #101517 0%, #1a2529 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.quiz-container {
    position: relative;
    width: 100%;
    max-width: 800px;
    text-align: center;
}

.quiz-buttons {
    margin-top: 20px;
    display: flex;
    justify-content: center;
    gap: 20px;
}

.quiz-button {
    display: inline-block;
    padding: 12px 20px;
    background: linear-gradient(90deg, #007bff, #00c4ff);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-size: 1rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.quiz-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 123, 255, 0.3);
}

.back-button {
    background: linear-gradient(90deg, #28a745, #34c759);
}

.back-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.3);
}

@media (max-width: 480px) {
    .login-container, .dashboard-container {
        padding: 1.5rem;
        max-width: 90%;
    }

    .main-title {
        font-size: 2rem;
        margin-bottom: 1rem;
rid: 1rem;
    }

    .logo-img {
        width: 100px;
        margin-bottom: 1rem;
    }

    .dashboard-container {
        max-width: 100%;
    }

    .category-title {
        font-size: 1rem;
        padding: 0.7rem;
    }

    .link-item {
        font-size: 0.95rem;
        padding: 0.7rem;
    }

    .quiz-description {
        font-size: 0.8rem;
    }

    .quiz-container {
        padding: 1rem;
    }

    .quiz-buttons {
        flex-direction: column;
        gap: 10px;
    }

    .input-icon {
        font-size: 1.2rem;
        width: 1.6rem;
    }

    .input-with-icon {
        gap: 0.5rem;
    }

    .input-with-icon input {
        padding: 0.8rem;
        font-size: 0.95rem;
    }
}