@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600&display=swap');

:root {
    --primary-color: #6a11cb;
    --secondary-color: #f8f7ff;
    --accent-color: #2575fc;
    --text-color: #333;
    --border-color: #ddd;
    --shadow-color: rgba(106, 17, 203, 0.15);
}

body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    background: linear-gradient(135deg, #f5f7fa, #c3cfe2);
    color: var(--text-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow: hidden; /* Prevent scrollbars from appearing for the blobs */
}

body::before,
body::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    filter: blur(150px);
    z-index: -1;
}

body::before {
    background-color: var(--primary-color);
    top: -50px;
    left: -50px;
    animation: moveBlob1 15s infinite alternate;
}

body::after {
    background-color: var(--accent-color);
    bottom: -50px;
    right: -50px;
    animation: moveBlob2 20s infinite alternate;
}

@keyframes moveBlob1 {
    from { transform: translate(0, 0); }
    to { transform: translate(100px, 150px); }
}

@keyframes moveBlob2 {
    from { transform: translate(0, 0); }
    to { transform: translate(-150px, -100px); }
}

.app-container {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 250px;
    background-color: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    margin: 1rem;
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.sidebar.collapsed {
    transform: translateX(-120%);
    opacity: 0;
    transform: scale(0.9);
}

.sidebar-header {
    margin-bottom: 2rem;
}

.sidebar-title {
    font-weight: 600;
    font-size: 1.5rem;
    margin: 0;
}

.sidebar-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--primary-color);
    transition: transform 0.2s;
    z-index: 1001; /* Ensure it's above other content */
}

.sidebar-toggle:hover {
    transform: scale(1.1);
}

.classes-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.classes-nav a {
    display: block;
    padding: 0.75rem 1rem;
    text-decoration: none;
    color: var(--text-color);
    border-radius: 8px;
    transition: background-color 0.3s, transform 0.3s;
    font-weight: 400;
}

.classes-nav a {
    position: relative;
    overflow: hidden;
}

.classes-nav a:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(5px);
    z-index: 1;
    transition: opacity 0.3s;
    opacity: 0;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.classes-nav a:hover:before, .classes-nav a.active:before {
    opacity: 1;
    -webkit-mask-image: radial-gradient(circle at var(--x) var(--y), black 50px, transparent 150px);
    mask-image: radial-gradient(circle at var(--x) var(--y), black 50px, transparent 150px);
}

.classes-nav a span {
    position: relative;
    z-index: 2;
}

.profile {
    margin-top: auto;
    text-align: center;
}

.profile img {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: 3px solid var(--primary-color);
    padding: 3px;
}

.main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.main-header {
    display: flex;
    align-items: center;
    padding: 1rem 2rem;
}

.main-header h1 {
    margin-left: 1rem;
}

.main-header h1 {
    font-weight: 600;
}

.homework-list {
    flex-grow: 1;
    padding: 2rem;
    overflow-y: auto;
    transition: opacity 0.5s ease-in-out;
}

.homework-item {
    display: flex;
    align-items: stretch;
    background-color: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 1rem;
    border-radius: 16px;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 12px var(--shadow-color);
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
}

.homework-item:hover {
    transform: translateY(-5px) scale(1.01);
    box-shadow: 0 8px 20px var(--shadow-color);
}

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

.homework-item.completed {
    opacity: 0.6;
}

.homework-item.completed .homework-details h3,
.homework-item.completed .homework-details p {
    text-decoration: line-through;
}

.homework-pill {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    background-color: var(--secondary-color);
    padding: 1rem;
    border-radius: 10px;
    margin-right: 1rem;
}

.due-date {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary-color);
}

.checkbox-container {
    margin-top: 1rem;
}

.completion-status {
    display: flex;
    align-items: center;
    margin-top: 1rem;
}

.completed-label {
    background-color: #4CAF50;
    color: white;
    padding: 0.3rem 0.6rem;
    border-radius: 5px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-right: 0.5rem;
}

.homework-item:not(.completed) .completed-label {
    display: none;
}

.homework-item.completed .checkbox-container {
    /* We no longer hide the checkbox, so it can be unchecked */
}

.homework-content {
    display: flex;
    flex-grow: 1;
    align-items: center;
}

.homework-details {
    flex-grow: 1;
}

.homework-details h3 {
    margin: 0 0 0.5rem 0;
    font-weight: 600;
}

.homework-details p {
    margin: 0;
    color: #666;
}

.homework-image {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: 8px;
    margin-left: 1rem;
}

.upload-time {
    font-size: 0.8rem;
    color: #999;
    align-self: flex-end;
    margin-left: 1rem;
}

.main-footer {
    padding: 1rem 2rem;
    display: flex;
    justify-content: center;
}

.dropzone {
    width: 100%;
    max-width: 600px;
    padding: 2rem;
    border: 2px dashed var(--border-color);
    border-radius: 10px;
    text-align: center;
    cursor: pointer;
    transition: background-color 0.3s, border-color 0.3s;
}

.dropzone.dragover {
    background-color: var(--secondary-color);
    border-color: var(--primary-color);
}

#add-homework-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#add-homework-form input {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
}

#add-homework-form button {
    padding: 0.8rem 1.8rem;
    border: none;
    background-image: linear-gradient(to right, var(--primary-color), var(--accent-color));
    color: white;
    border-radius: 25px;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    font-family: 'Poppins', sans-serif;
    font-weight: 400;
}
.profile-content {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.profile-avatar {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 2rem;
}

#profile-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
    max-width: 400px;
}

#profile-form input {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 5px;
}

#profile-form button {
    padding: 0.8rem 1.8rem;
    border: none;
    background-image: linear-gradient(to right, var(--primary-color), var(--accent-color));
    color: white;
    border-radius: 25px;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    font-family: 'Poppins', sans-serif;
    font-weight: 400;
}

.modal {
    display: none;
    position: fixed;
    z-index: 100;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    margin: 10% auto;
    padding: 25px;
    width: 90%;
    max-width: 550px;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    animation: slideIn 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.close-button {
    position: absolute;
    top: 15px;
    right: 15px;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background-color: rgba(0, 0, 0, 0.1);
    color: #fff;
    font-size: 20px;
    line-height: 30px;
    text-align: center;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.3s;
}

.close-button:hover,
.close-button:focus {
    background-color: rgba(0, 0, 0, 0.3);
    transform: scale(1.1);
}

.comment-input-area {
    display: flex;
    margin-top: 1rem;
}

#comment-input {
    flex-grow: 1;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 0.5rem 1rem;
    font-family: 'Poppins', sans-serif;
}

#post-comment-btn {
    margin-left: 0.5rem;
    padding: 0.5rem 1rem;
    border: none;
    background-image: linear-gradient(to right, var(--primary-color), var(--accent-color));
    color: white;
    border-radius: 20px;
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
}

.comment {
    background-color: var(--secondary-color);
    padding: 0.5rem 1rem;
    border-radius: 10px;
    margin-top: 0.5rem;
}

.emoji-buttons {
    margin-top: 1rem;
}

.emoji-btn {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 1.2rem;
    padding: 0.2rem 0.8rem;
    cursor: pointer;
    transition: transform 0.2s, background-color 0.2s;
}

.emoji-btn:hover {
    transform: scale(1.1);
    background-color: var(--secondary-color);
}

#reactions-container {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.reaction {
    background-color: var(--secondary-color);
    padding: 0.2rem 0.8rem;
    border-radius: 20px;
    font-size: 1.2rem;
}

input[type="checkbox"] {
    display: none;
}

input[type="checkbox"] + label {
    position: relative;
    padding-left: 35px;
    cursor: pointer;
    display: inline-block;
    height: 25px;
    line-height: 25px;
}

input[type="checkbox"] + label:before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    width: 25px;
    height: 25px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    background: #fff;
    transition: all 0.2s;
}

input[type="checkbox"]:checked + label:before {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

input[type="checkbox"]:checked + label:after {
    content: '';
    position: absolute;
    top: 5px;
    left: 9px;
    width: 8px;
    height: 15px;
    border: solid white;
    border-width: 0 3px 3px 0;
    transform: rotate(45deg);
}

@media (max-width: 768px) {
    /* On smaller screens, the sidebar is hidden by default. */
    .sidebar {
        position: absolute;
        z-index: 10;
        transform: translateX(-100%);
    }

    /* The .collapsed class is used to show the sidebar on smaller screens. */
    .sidebar.collapsed {
        transform: translateX(0);
    }
}.modal-button {
    padding: 0.8rem 1.8rem;
    border: none;
    background-image: linear-gradient(to right, var(--primary-color), var(--accent-color));
    color: white;
    border-radius: 25px;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    font-family: 'Poppins', sans-serif;
    font-weight: 400;
}

.modal-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.modal-actions {
    margin-bottom: 1rem;
}
.leaderboard-nav {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}
.leaderboard-content {
    padding: 2rem;
}
.leaderboard-item {
    display: flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    background-color: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    margin-bottom: 1rem;
    box-shadow: 0 4px 12px var(--shadow-color);
}
.leaderboard-item .rank {
    font-size: 1.5rem;
    font-weight: 600;
    margin-right: 1.5rem;
    color: var(--primary-color);
}
.leaderboard-item .avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    margin-right: 1rem;
}
.leaderboard-item .name {
    flex-grow: 1;
    font-weight: 600;
}
.leaderboard-item .xp {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-color);
}
.xp-counter {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 2rem;
    font-weight: 600;
    color: var(--primary-color);
}
.xp-notification {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 1rem 2rem;
    border-radius: 20px;
    font-size: 2rem;
    font-weight: 600;
    z-index: 1001;
    animation: fadeInOut 3s ease-in-out;
}

@keyframes fadeInOut {
    0% { opacity: 0; transform: translate(-50%, -50%) scale(0.5); }
    10% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
    90% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
    100% { opacity: 0; transform: translate(-50%, -50%) scale(0.5); }
}
.homework-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
}

.reactions-container-item {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}