/* Custom styles for the application */
:root {
    --primary-color: #4285F4;
    --secondary-color: #FBBC05;
    --accent-color: #34A853;
    --tertiary-color: #EA4335;
    --neutral-light-gray: #F8F9FA;
    --neutral-dark-text: #202124;
    --font-headings: 'Poppins', sans-serif;
    --font-body: 'Roboto', sans-serif;
}

body {
    font-family: var(--font-body);
    color: var(--neutral-dark-text);
    background-color: var(--neutral-light-gray);
    line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-headings);
    font-weight: 700;
}

.btn {
    font-family: var(--font-headings);
    font-weight: 600;
    border-radius: 8px;
    padding: 12px 28px;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.btn-primary:hover {
    background-color: #3367D6;
    border-color: #3367D6;
}

.btn-secondary {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    color: var(--neutral-dark-text);
}

.btn-secondary:hover {
    background-color: #F9A825;
    border-color: #F9A825;
}

.btn-tertiary {
    background-color: var(--tertiary-color);
    border-color: var(--tertiary-color);
    color: #fff;
}

.btn-tertiary:hover {
    background-color: #D93025;
    border-color: #D93025;
}

.login-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    min-height: 100vh;
    width: 100%;
}

.login-branding {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    text-align: center;
}

.login-branding-content h1 {
    font-size: 2.8rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.login-branding-content p {
    font-size: 1.1rem;
    max-width: 400px;
    margin: 0 auto;
}

.login-form-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    background-color: #fff;
}

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

.login-form-container h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--neutral-dark-text);
}

.login-form {
    margin-top: 30px;
}

.form-group {
    margin-bottom: 20px;
}

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

.form-group input, .form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.1);
}

.btn-block {
    width: 100%;
    padding: 15px;
    font-size: 1rem;
}

.login-form-footer {
    text-align: center;
    margin-top: 20px;
    font-size: 0.9rem;
}

/* Student Dashboard */
.dashboard-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background-color: var(--neutral-dark-text);
    color: #fff;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100%;
}

.sidebar-header {
    padding: 25px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h3 {
    color: #fff;
    font-weight: 600;
}

.sidebar-nav {
    flex-grow: 1;
}

.sidebar-nav a {
    display: block;
    padding: 15px 20px;
    color: #fff;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease;
}

.sidebar-nav a:hover, .sidebar-nav a.active {
    background-color: rgba(255,255,255,0.1);
}

.sidebar-nav a i {
    margin-right: 15px;
    width: 20px;
    text-align: center;
}

.sidebar-footer {
    padding: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.logout-btn {
    display: block;
    text-align: center;
    background-color: var(--primary-color);
    color: #fff;
    padding: 10px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

.logout-btn:hover {
    background-color: #3367D6;
}

.main-content {
    margin-left: 260px;
    flex-grow: 1;
    background-color: var(--neutral-light-gray);
    padding: 30px;
}

.header {
    background-color: #fff;
    padding: 30px;
    border-radius: 12px;
    margin-bottom: 30px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.header h2 {
    font-size: 2.2rem;
    margin-bottom: 5px;
}

.assignments-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 25px;
}

.assignment-card {
    background-color: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.assignment-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.08);
}

.assignment-card-header {
    padding: 20px;
    border-bottom: 1px solid #eee;
}

.assignment-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0;
}

.assignment-due-date {
    font-size: 0.85rem;
    color: #5f6368;
}

.assignment-card-body {
    padding: 20px;
    flex-grow: 1;
}

.assignment-card-footer {
    padding: 0 20px 20px;
}

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    background-color: #fff;
    border-radius: 12px;
}

.empty-state i {
    font-size: 4rem;
    color: var(--accent-color);
    margin-bottom: 20px;
}

.empty-state h4 {
    font-size: 1.5rem;
    margin-bottom: 10px;
}

/* Assignment Detail */
.exercises-section {
    max-width: 900px;
}

.exercise-list {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.exercise-card {
    background-color: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
}

.exercise-card-header {
    padding: 20px;
    border-bottom: 1px solid #eee;
    background-color: #fafafa;
}

.exercise-card-header h4 {
    margin: 0;
    font-size: 1.3rem;
}

.exercise-card-body {
    padding: 25px;
}

.exercise-question {
    font-size: 1.1rem;
    margin-bottom: 25px;
}

.exercise-actions {
    margin-top: 20px;
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.hint-container .alert {
    margin-top: 20px;
}

/* Responsive adjustments */
@media (max-width: 992px) {
    .login-container {
        grid-template-columns: 1fr;
    }

    .login-branding {
        display: none;
    }

    .login-form-wrapper {
        padding: 20px;
    }

    .sidebar {
        position: static;
        width: 100%;
        height: auto;
        flex-direction: row;
        align-items: center;
    }

    .main-content {
        margin-left: 0;
    }

    .sidebar-header {
        display: none;
    }

    .sidebar-nav {
        display: flex;
        flex-grow: 1;
        justify-content: space-around;
    }

    .sidebar-footer {
        display: none; /* Or adjust to a dropdown menu */
    }
}