* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f4f5f6;
    color: #111;
    min-height: 100vh;
    padding: 0;
    margin: 0;
    transition: background-color 0.3s ease, color 0.3s ease;
}

html, body {
    background: #f4f5f6;
    color: #111;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    min-height: 100%;
    transition: background-color 0.3s ease, color 0.3s ease;
}

button, input, select, textarea {
    font: inherit;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Smooth transitions for theme switching */
.auth-box, .project-box, .task-modal-box, .stat-card, .dashboard-section,
.task-card, .kanban-column, .notification-dropdown,
.form-section, .sidebar, .app-header-wrapper {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* Auth Container */
.auth-container {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f4f5f6;
    z-index: 1000;
}

.auth-container.active {
    display: flex;
}

.auth-box {
    background: #ffffff;
    border: 1px solid #d8d8d8;
    border-radius: 16px;
    max-width: 520px;
    width: 100%;
    padding: 28px;
    box-shadow: 0 12px 40px rgba(16, 24, 40, 0.08);
}

.auth-box h1 {
    margin-bottom: 14px;
    font-size: 1.75rem;
    color: #111;
    letter-spacing: -0.02em;
    text-align: center;
}

.auth-box p {
    text-align: center;
    color: #4d4d4d;
    margin-bottom: 30px;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.auth-form input {
    width: 100%;
    border: 1px solid #d8d8d8;
    background: #ffffff;
    color: #111;
    border-radius: 10px;
    padding: 12px 14px;
}

.auth-form input:focus {
    outline: none;
    border-color: #a8a8a8;
    box-shadow: 0 0 0 3px rgba(16, 24, 40, 0.06);
}

.btn-auth {
    border: 1px solid #c8c8c8;
    border-radius: 10px;
    background: #ffffff;
    color: #111;
    cursor: pointer;
    padding: 12px 18px;
    transition: background 0.2s ease, border-color 0.2s ease;
    font-weight: 600;
}

.btn-auth:hover {
    background: #f2f3f4;
    border-color: #b8b8b8;
}

.divider {
    text-align: center;
    margin: 20px 0;
    color: #ccc;
    font-weight: 600;
}

.btn-google {
    padding: 12px;
    background: white;
    color: #333;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em;
    font-weight: 600;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-google:hover {
    border-color: #667eea;
    background: #f9f9f9;
}

.google-icon {
    width: 20px;
    height: 20px;
}

.auth-toggle {
    text-align: center;
    margin-top: 20px;
    color: #666;
}

.auth-toggle button {
    background: none;
    border: none;
    color: #667eea;
    cursor: pointer;
    font-weight: 600;
    text-decoration: underline;
    margin-left: 5px;
}

.auth-toggle button:hover {
    color: #764ba2;
}

.auth-action-link {
    margin: 16px 0 0;
    text-align: center;
}

.auth-link-btn {
    background: none;
    border: none;
    color: #667eea;
    cursor: pointer;
    font-weight: 600;
    text-decoration: underline;
    font-size: 0.95rem;
}

.auth-link-btn:hover {
    color: #4a5ecc;
}

.error-message {
    background: #ffe0e0;
    color: #d32f2f;
    padding: 12px;
    border-radius: 8px;
    font-size: 0.9em;
    margin-bottom: 15px;
    display: none;
}

.error-message.show {
    display: block;
}

.success-message {
    background: #e0f7e3;
    color: #388e3c;
    padding: 12px;
    border-radius: 8px;
    font-size: 0.9em;
    margin-bottom: 15px;
    display: none;
}

.success-message.show {
    display: block;
}

/* App Wrapper */
.app-wrapper {
    display: none;
}

.app-wrapper.active {
    display: block;
}

/* Header */
.container {
    max-width: 1200px;
    margin: 0 auto;
}

.app-header-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}

.app-header-wrapper header {
    flex: 1;
    margin-bottom: 0;
}

header {
    text-align: center;
    color: #111;
    margin-bottom: 40px;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
}

header p {
    font-size: 1.1em;
    opacity: 0.9;
}

.user-section {
    display: flex;
    align-items: center;
    gap: 15px;
    color: #111;
}

.user-avatar {
    width: 42px;
    height: 42px;
    background: #e9ecef;
    color: #333;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9em;
    overflow: hidden;
    flex-shrink: 0;
}

.user-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.user-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
    line-height: 1.1;
}

.user-name {
    font-size: 0.95em;
    font-weight: 700;
    color: #111;
}

.user-email {
    font-size: 0.85em;
    opacity: 0.9;
}

.btn-edit-profile {
    background: #ffffff;
    border: 1px solid #d8d8d8;
    color: #111;
    padding: 7px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.8em;
    font-weight: 600;
    text-transform: uppercase;
    transition: all 0.2s ease;
}

.btn-edit-profile:hover {
    background: #f2f3f4;
    border-color: #b8b8b8;
}

.btn-logout {
    background: #ffffff;
    color: #111;
    border: 1px solid #d8d8d8;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 600;
    transition: all 0.3s ease;
    text-transform: uppercase;
    white-space: nowrap;
}

.btn-logout:hover {
    background: #f2f3f4;
    border-color: #b8b8b8;
}

/* Profile Modal */
.profile-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
    z-index: 1100;
}

.profile-modal.active {
    display: flex;
}

.profile-box {
    background: #ffffff;
    border: 1px solid #d8d8d8;
    border-radius: 16px;
    max-width: 520px;
    width: 100%;
    padding: 28px;
    box-shadow: 0 12px 40px rgba(16, 24, 40, 0.08);
}

.profile-box h3 {
    margin-bottom: 14px;
    font-size: 1.75rem;
    color: #111;
    letter-spacing: -0.02em;
}

.profile-box .form-group {
    margin-bottom: 12px;
}

.profile-box .btn-row {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.btn-secondary {
    background: #f0f0f0;
    border: 1px solid #dedede;
    color: #444;
}

.btn-secondary:hover {
    background: #e0e0e0;
}

.profile-error {
    color: #d32f2f;
    margin-top: 8px;
    font-size: 0.85em;
    display: none;
}

.profile-error.show {
    display: block;
}

/* Sidebar */
.sidebar {
    background: #ffffff;
    width: 280px;
    padding: 24px;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
    border: 1px solid #e3e3e3;
    z-index: 100;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.sidebar-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0;
    letter-spacing: -0.02em;
}

.projects-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.btn-create-project {
    width: 100%;
    padding: 10px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 600;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.btn-create-project:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.project-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px;
    margin-bottom: 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.project-item:hover {
    background: #e8f4fd;
}

.project-item.active {
    background: #667eea;
    color: white;
    border-color: #667eea;
}

.project-color {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

.project-info {
    flex: 1;
    min-width: 0;
}

.project-name {
    font-weight: 600;
    font-size: 0.9em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.project-desc {
    font-size: 0.8em;
    opacity: 0.8;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.project-actions {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.project-item:hover .project-actions {
    opacity: 1;
}

.btn-project-delete {
    background: none;
    border: none;
    color: #ff6b6b;
    cursor: pointer;
    font-size: 0.8em;
    padding: 4px;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.btn-project-delete:hover {
    background: #ff6b6b;
    color: white;
}

/* Project Modal */
.project-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
    z-index: 1200;
}

.project-modal.active {
    display: flex;
}

.project-box {
    background: #ffffff;
    border: 1px solid #d8d8d8;
    border-radius: 16px;
    max-width: 520px;
    width: 100%;
    padding: 28px;
    box-shadow: 0 12px 40px rgba(16, 24, 40, 0.08);
}

.project-box h3 {
    margin-bottom: 14px;
    font-size: 1.75rem;
    color: #111;
    letter-spacing: -0.02em;
}

.project-form {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.project-form .form-group {
    margin-bottom: 12px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.85rem;
    font-weight: 700;
    color: #333;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    border: 1px solid #d8d8d8;
    background: #ffffff;
    color: #111;
    border-radius: 10px;
    padding: 12px 14px;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #a8a8a8;
    box-shadow: 0 0 0 3px rgba(16, 24, 40, 0.06);
}

.color-options {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.color-option {
    width: 32px;
    height: 32px;
    border-radius: 10px;
    border: 1px solid #d8d8d8;
    cursor: pointer;
}

.color-option.selected {
    border-color: #111;
}

.project-error {
    color: #d32f2f;
    margin-top: 8px;
    font-size: 0.85em;
    display: none;
}

.project-error.show {
    display: block;
}

.btn-row {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.btn-row button {
    border: 1px solid #c8c8c8;
    border-radius: 10px;
    background: #ffffff;
    color: #111;
    cursor: pointer;
    padding: 12px 18px;
    transition: background 0.2s ease, border-color 0.2s ease;
    font-weight: 600;
}

.btn-row button:hover {
    background: #f2f3f4;
    border-color: #b8b8b8;
}

/* Invite Modal */
.invite-modal .project-box {
    width: min(90%, 350px);
}

.invite-form .form-group {
    margin-bottom: 12px;
}

/* Main Content */
.main-content-wrapper {
    margin-left: 320px;
    padding: 30px;
    min-height: 100vh;
    background: #f4f5f6;
}

.main-content {
    margin-left: 0;
    padding: 0;
    min-height: 100vh;
    background: #f4f5f6;
}

.current-project-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    margin-bottom: 24px;
    padding: 22px;
    background: #ffffff;
    border: 1px solid #e2e2e2;
    border-radius: 18px;
}

.current-project-info {
    display: flex;
    align-items: center;
    gap: 14px;
}

.current-project-color {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: #d8d8d8;
}

.current-project-name {
    font-weight: 700;
    color: #111;
    font-size: 1.1rem;
}

.current-project-desc {
    color: #4d4d4d;
    font-size: 0.92rem;
}

.btn-invite {
    background: #ffffff;
    border: 1px solid #d8d8d8;
    color: #111;
    padding: 10px 16px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 600;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.btn-invite:hover {
    background: #f2f3f4;
    border-color: #b8b8b8;
}

.btn-manage-members {
    background: #667eea;
    border: 1px solid #667eea;
    color: #ffffff;
    padding: 10px 16px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 600;
    transition: all 0.3s ease;
    white-space: nowrap;
    margin-left: 8px;
}

.btn-manage-members:hover {
    background: #5a67d8;
    border-color: #5a67d8;
}

.role-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-left: 8px;
}

.role-badge-admin {
    background: #e6f7ff;
    color: #0066cc;
    border: 1px solid #b3d9ff;
}

.role-badge-member {
    background: #f0f0f0;
    color: #666666;
    border: 1px solid #cccccc;
}

.members-list {
    max-height: 400px;
    overflow-y: auto;
    margin-bottom: 16px;
}

.member-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px;
    border: 1px solid #e2e2e2;
    border-radius: 8px;
    margin-bottom: 8px;
    background: #ffffff;
}

.member-info {
    display: flex;
    align-items: center;
    flex: 1;
}

.member-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: #667eea;
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    margin-right: 12px;
}

.member-details h4 {
    margin: 0;
    font-size: 0.9rem;
    font-weight: 600;
}

.member-details p {
    margin: 4px 0 0 0;
    font-size: 0.8rem;
    color: #666;
}

.member-role {
    font-size: 0.8rem;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 600;
    text-transform: uppercase;
}

.member-role.admin {
    background: #e6f7ff;
    color: #0066cc;
}

.member-role.member {
    background: #f0f0f0;
    color: #666;
}

.role-select {
    padding: 4px 8px;
    border: 1px solid #d8d8d8;
    border-radius: 6px;
    font-size: 0.8rem;
    background: white;
}

.no-project-message {
    padding: 24px;
    border: 1px solid #e2e2e2;
    border-radius: 14px;
    background: #fafafa;
    margin-bottom: 20px;
}

.no-project-text {
    color: #666;
    font-size: 0.95rem;
}

/* Form Section */
.form-section {
    background: #ffffff;
    padding: 24px;
    border-radius: 18px;
    margin-bottom: 24px;
}

.form-section h2 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    color: #111;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.form-grid .form-group:nth-last-child(-n+2) {
    grid-column: span 2;
}

.btn-add {
    border: 1px solid #c8c8c8;
    border-radius: 10px;
    background: #ffffff;
    color: #111;
    cursor: pointer;
    padding: 12px 18px;
    transition: background 0.2s ease, border-color 0.2s ease;
    font-weight: 600;
    grid-column: 1 / -1;
}

.btn-add:hover {
    background: #f2f3f4;
    border-color: #b8b8b8;
}

/* Tasks Section */
.tasks-section {
    padding: 0;
}

.tasks-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 18px;
}

.tasks-header h2 {
    font-size: 1.5rem;
    margin-bottom: 0;
    color: #111;
}

.task-count {
    padding: 8px 14px;
    border-radius: 999px;
    background: #f2f3f4;
    color: #333;
}

.filter-section {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 18px;
}

.filter-btn {
    background: #ffffff;
    border: 1px solid #d8d8d8;
    color: #333;
    padding: 10px 16px;
    border-radius: 10px;
    transition: background 0.2s ease, border-color 0.2s ease;
}

.filter-btn.active {
    background: #e9ecef;
    border-color: #b8b8b8;
}

/* Kanban Board */
.kanban-board {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
}

.kanban-column {
    background: #f8f9fa;
    border: 1px solid #e2e2e2;
    border-radius: 18px;
    padding: 14px;
    min-height: 320px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.kanban-column-header {
    font-weight: 700;
    color: #111;
    margin-bottom: 10px;
}

.kanban-column-tasks {
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex: 1;
}

.kanban-empty {
    color: #6b6b6b;
    font-size: 0.95rem;
    padding: 20px;
    border: 1px dashed #d8d8d8;
    border-radius: 14px;
    text-align: center;
}

/* Task Card */
.task-card {
    background: #ffffff;
    border: 1px solid #e2e2e2;
    border-radius: 16px;
    box-shadow: 0 10px 24px rgba(16, 24, 40, 0.04);
    padding: 18px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    cursor: grab;
}

.task-card.dragging {
    opacity: 0.7;
    box-shadow: 0 16px 40px rgba(16, 24, 40, 0.08);
}

.task-card.task-overdue {
    border-left: 4px solid #ff4444;
    background: #fff5f5;
}

.task-card.task-due-soon {
    border-left: 4px solid #ff9500;
    background: #fffaf0;
}

.task-info {
    flex: 1;
}

.task-title {
    font-size: 1rem;
    font-weight: 700;
    color: #111;
    display: flex;
    justify-content: space-between;
    gap: 10px;
}

.task-description {
    color: #4d4d4d;
    font-size: 0.94rem;
    line-height: 1.5;
}

.task-details {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.task-detail {
    display: flex;
    flex-direction: column;
    gap: 6px;
    color: #4d4d4d;
    font-size: 0.9rem;
}

.detail-label {
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    color: #6b6b6b;
    font-weight: 700;
}

.task-assignee {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #333;
}

.assignee-avatar {
    width: 30px;
    height: 30px;
    border-radius: 999px;
    background: #e9ecef;
    display: grid;
    place-items: center;
    color: #333;
    font-weight: 700;
    flex-shrink: 0;
}

.task-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.task-tag {
    background: #f2f3f4;
    color: #4d4d4d;
    padding: 5px 10px;
    border-radius: 999px;
    font-size: 0.82rem;
    font-weight: 600;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 6px 10px;
    border-radius: 999px;
    background: #f2f3f4;
    color: #4d4d4d;
    font-size: 0.78rem;
    font-weight: 700;
}

.priority-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 4px 10px;
    border-radius: 999px;
    background: #f2f3f4;
    color: #4d4d4d;
    font-size: 0.75rem;
    font-weight: 700;
}

.task-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.btn-edit,
.btn-delete {
    width: 100%;
    border: 1px solid #c8c8c8;
    border-radius: 10px;
    background: #ffffff;
    color: #111;
    cursor: pointer;
    padding: 12px 18px;
    transition: background 0.2s ease, border-color 0.2s ease;
    font-weight: 600;
}

.btn-edit:hover,
.btn-delete:hover {
    background: #f2f3f4;
    border-color: #b8b8b8;
}

/* Task Modal */
.task-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
    z-index: 1200;
}

.task-modal.active {
    display: flex;
}

.task-modal-box {
    background: #ffffff;
    border: 1px solid #d8d8d8;
    border-radius: 16px;
    width: min(90%, 500px);
    max-height: 80vh;
    overflow-y: auto;
    padding: 24px;
    box-shadow: 0 12px 40px rgba(16, 24, 40, 0.08);
}

.task-modal-box h3 {
    margin-bottom: 16px;
    color: #333;
    font-size: 1.5rem;
}

.task-modal .form-group {
    margin-bottom: 16px;
}

.task-modal .form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    color: #333;
}

.task-modal input,
.task-modal select,
.task-modal textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 1em;
    font-family: inherit;
}

.task-modal textarea {
    resize: vertical;
    min-height: 80px;
}

.task-modal .btn-row {
    display: flex;
    gap: 10px;
    margin-top: 20px;
}

/* Tab Switching */
.task-modal-tabs {
    display: flex;
    gap: 10px;
    border-bottom: 1px solid #d8d8d8;
    margin-bottom: 20px;
}

.task-modal-tab-btn {
    padding: 10px 16px;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: #666;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.2s ease;
}

.task-modal-tab-btn.active {
    color: #111;
    border-bottom-color: #111;
}

.task-modal-tab-content {
    display: none;
    max-height: 400px;
    overflow-y: auto;
}

.task-modal-tab-content.active {
    display: block;
}

/* Comments Section */
.comments-section,
.activity-section {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.comment-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding-bottom: 16px;
    border-bottom: 1px solid #e2e2e2;
}

.comment-input {
    padding: 10px 12px;
    border: 1px solid #d8d8d8;
    border-radius: 8px;
    font-family: inherit;
    font-size: 0.95rem;
    color: #111;
    resize: vertical;
    min-height: 60px;
}

.comment-input:focus {
    outline: none;
    border-color: #111;
    box-shadow: 0 0 0 2px rgba(17, 17, 17, 0.1);
}

.comment-btn-row {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.btn-comment {
    padding: 8px 16px;
    background: #111;
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9rem;
    transition: background 0.2s ease;
}

.btn-comment:hover {
    background: #333;
}

.btn-comment-cancel {
    background: #f4f5f6;
    color: #111;
}

.btn-comment-cancel:hover {
    background: #e8e8e8;
}

.comment-item {
    padding: 12px;
    background: #f8f9fa;
    border: 1px solid #e2e2e2;
    border-radius: 8px;
    display: flex;
    gap: 12px;
}

.comment-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: #d8d8d8;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.85rem;
    color: #111;
    flex-shrink: 0;
}

.comment-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.comment-header {
    display: flex;
    gap: 8px;
    align-items: center;
    font-size: 0.9rem;
}

.comment-author {
    font-weight: 600;
    color: #111;
}

.comment-timestamp {
    color: #999;
    font-size: 0.85rem;
}

.comment-text {
    color: #333;
    font-size: 0.95rem;
    line-height: 1.4;
    word-break: break-word;
}

.empty-comments {
    text-align: center;
    padding: 24px 12px;
    color: #999;
    font-size: 0.95rem;
}

/* Activity Section */
.activity-item {
    padding: 12px;
    background: #f8f9fa;
    border-left: 3px solid #d8d8d8;
    border-radius: 4px;
    display: flex;
    gap: 12px;
}

.activity-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: #d8d8d8;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.activity-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.activity-text {
    color: #333;
    font-size: 0.95rem;
}

.activity-timestamp {
    color: #999;
    font-size: 0.85rem;
}

.empty-activity {
    text-align: center;
    padding: 24px 12px;
    color: #999;
    font-size: 0.95rem;
}

/* Notification Bell */
.notification-bell {
    position: relative;
    background: none;
    border: none;
    color: #111;
    font-size: 1.3em;
    cursor: pointer;
    padding: 5px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.2s ease;
}

.notification-bell:hover {
    transform: scale(1.1);
}

.notification-icon {
    width: 20px;
    height: 20px;
    position: relative;
    border: 2px solid #111;
    border-radius: 4px 4px 0 0;
}

.notification-icon::before {
    content: '';
    position: absolute;
    top: -4px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    border: 2px solid #111;
    border-radius: 50%;
}

.notification-icon::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 8px;
    background: #111;
    border-radius: 0 0 2px 2px;
}

.notification-badge {
    position: absolute;
    top: -5px;
    right: -8px;
    background: #ff4444;
    color: white;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75em;
    font-weight: 700;
    min-width: 24px;
    text-align: center;
    padding: 0 4px;
}

.notification-dropdown {
    position: absolute;
    top: 50px;
    right: -10px;
    background: white;
    border: 1px solid #e2e2e2;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(16, 24, 40, 0.08);
    width: 360px;
    max-height: 420px;
    overflow-y: auto;
    z-index: 1001;
    display: none;
}

.notification-dropdown.active {
    display: block;
}

.notification-dropdown-header {
    padding: 14px 16px;
    border-bottom: 1px solid #e2e2e2;
    font-weight: 600;
    color: #111;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.notification-list {
    display: flex;
    flex-direction: column;
}

.notification-list-empty {
    padding: 32px 16px;
    text-align: center;
    color: #999;
    font-size: 0.95rem;
}

.notification-item {
    padding: 12px 16px;
    border-bottom: 1px solid #e2e2e2;
    cursor: pointer;
    transition: background 0.2s ease;
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

.notification-item:hover {
    background: #f8f9fa;
}

.notification-item.unread {
    background: #f0f4ff;
}

.notification-item:last-child {
    border-bottom: none;
}

.notification-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #667eea;
    margin-top: 6px;
    flex-shrink: 0;
}

.notification-item.read .notification-indicator {
    background: transparent;
}

.notification-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}

.notification-type {
    font-weight: 600;
    color: #111;
    font-size: 0.9rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.notification-message {
    color: #333;
    font-size: 0.85rem;
    line-height: 1.4;
    word-break: break-word;
}

.notification-timestamp {
    color: #999;
    font-size: 0.8rem;
    margin-top: 2px;
}

/* Subtasks */
.subtasks-section {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid #e0e0e0;
}

.subtasks-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.subtasks-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.subtask-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 0;
}

.subtask-checkbox {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.subtask-text {
    flex: 1;
    font-size: 0.85em;
}

.subtask-completed {
    text-decoration: line-through;
    color: #999;
}

.add-subtask {
    display: flex;
    gap: 8px;
    margin-top: 8px;
}

.add-subtask input {
    flex: 1;
    padding: 6px 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 0.85em;
}

.add-subtask button {
    background: #667eea;
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.8em;
}

.subtasks-summary {
    font-size: 0.85rem;
    color: #668;
}

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    position: fixed;
    top: 20px;
    left: 20px;
    background: #ffffff;
    color: #111;
    border: 1px solid #d8d8d8;
    border-radius: 12px;
    padding: 10px 14px;
    cursor: pointer;
    z-index: 1100;
}

.overlay {
    display: none;
}

.overlay.active {
    display: block;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .main-content-wrapper {
        margin-left: 0;
        padding: 24px;
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .kanban-board {
        grid-template-columns: 1fr;
    }

    .sidebar {
        width: 250px;
    }
}

@media (max-width: 768px) {
    .app-header-wrapper {
        flex-direction: column;
        gap: 20px;
    }

    .user-section {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }

    .sidebar {
        position: fixed;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        z-index: 1000;
        width: 280px;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .mobile-menu-btn {
        display: block;
    }

    .overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.15);
        z-index: 999;
    }

    .overlay.active {
        display: block;
    }

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

    .task-card {
        flex-direction: column;
        align-items: flex-start;
    }

    .task-details {
        grid-template-columns: 1fr;
    }
}

/* Sidebar Dashboard Button */
.sidebar-dashboard-btn {
    padding: 8px 16px;
    border-bottom: 1px solid #e2e2e2;
}

.btn-dashboard {
    width: 100%;
    background: #667eea;
    border: none;
    color: white;
    padding: 10px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9em;
    font-weight: 600;
    transition: background 0.3s ease;
}

.btn-dashboard:hover {
    background: #5a67d8;
}

/* Dashboard Styles */
.dashboard-section-wrapper {
    padding: 28px 0;
}

.dashboard {
    padding: 0 28px;
}

.dashboard h1 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 24px;
    color: #111;
}

.dashboard h2 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: #111;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background: #ffffff;
    border: 1px solid #d8d8d8;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.stat-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.stat-value {
    font-size: 2.4rem;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 12px;
}

.stat-breakdown {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.status-badge {
    font-size: 0.8rem;
    padding: 4px 8px;
    border-radius: 6px;
    background: #f0f0f0;
    color: #666;
    font-weight: 600;
}

.status-badge.to-do {
    background: #fff3e0;
    color: #ff9500;
}

.status-badge.in-progress {
    background: #e3f2fd;
    color: #2196f3;
}

.status-badge.review {
    background: #f3e5f5;
    color: #9c27b0;
}

.status-badge.done {
    background: #e8f5e9;
    color: #4caf50;
}

.stat-detail {
    font-size: 0.8rem;
    color: #999;
}

.dashboard-section {
    background: #ffffff;
    border: 1px solid #d8d8d8;
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

/* Overdue Tasks */
.overdue-tasks-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.overdue-task-item {
    padding: 12px;
    background: #fff5f5;
    border-left: 3px solid #ff4444;
    border-radius: 6px;
}

.overdue-task-title {
    font-weight: 600;
    color: #cc3333;
    margin-bottom: 4px;
    font-size: 0.95rem;
}

.overdue-task-date {
    font-size: 0.8rem;
    color: #999;
}

.overdue-more {
    font-size: 0.85rem;
    color: #666;
    padding: 8px;
    text-align: center;
}

/* Project Progress */
.project-progress-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.project-progress-item {
    padding: 12px 0;
}

.project-progress-name {
    font-weight: 600;
    color: #111;
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.project-progress-bar {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.progress-background {
    width: 100%;
    height: 8px;
    background: #e8e8e8;
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #667eea 0%, #667eea 100%);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.progress-label {
    font-size: 0.75rem;
    color: #666;
    font-weight: 600;
}

/* User Statistics */
.user-stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 16px;
}

.user-stat-item {
    padding: 16px;
    background: #fafafa;
    border: 1px solid #e8e8e8;
    border-radius: 8px;
}

.user-stat-name {
    font-weight: 600;
    color: #111;
    font-size: 0.9rem;
    margin-bottom: 8px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-stat-progress {
    font-size: 1.4rem;
    font-weight: 700;
    color: #667eea;
    margin-bottom: 4px;
}

.user-stat-detail {
    font-size: 0.8rem;
    color: #999;
}

/* Activity Log */
.activity-log {
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-height: 500px;
    overflow-y: auto;
}

.activity-item {
    padding: 12px;
    border-left: 3px solid #667eea;
    background: #fafafa;
    border-radius: 4px;
}

.activity-time {
    font-size: 0.75rem;
    color: #999;
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 4px;
}

.activity-action {
    font-weight: 600;
    color: #111;
    font-size: 0.9rem;
}

.activity-detail {
    font-size: 0.8rem;
    color: #666;
    margin-top: 4px;
}

.empty-state {
    padding: 32px 16px;
    text-align: center;
    color: #999;
    font-size: 0.95rem;
}

@media (max-width: 1024px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .user-stats-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
}

@media (max-width: 768px) {
    .dashboard {
        padding: 0 16px;
    }

    .dashboard h1 {
        font-size: 1.4rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .user-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Dark Mode Styles */
html[data-theme="dark"] {
    background: #1a1a1a;
    color: #e0e0e0;
}

html[data-theme="dark"] body {
    background: #1a1a1a;
    color: #e0e0e0;
}

html[data-theme="dark"] .auth-container {
    background: #1a1a1a;
}

html[data-theme="dark"] .auth-box {
    background: #2d2d2d;
    border-color: #444;
}

html[data-theme="dark"] .form-group label {
    color: #d0d0d0;
}

html[data-theme="dark"] input,
html[data-theme="dark"] textarea,
html[data-theme="dark"] select {
    background: #333;
    color: #e0e0e0;
    border-color: #444;
}

html[data-theme="dark"] input::placeholder,
html[data-theme="dark"] textarea::placeholder {
    color: #888;
}

html[data-theme="dark"] .btn-auth {
    background: #667eea;
    color: white;
}

html[data-theme="dark"] .btn-auth:hover {
    background: #5a67d8;
}

html[data-theme="dark"] .btn-auth.btn-secondary {
    background: #444;
    color: #d0d0d0;
    border-color: #555;
}

html[data-theme="dark"] .btn-auth.btn-secondary:hover {
    background: #555;
}

html[data-theme="dark"] .app-wrapper {
    background: #1a1a1a;
}

html[data-theme="dark"] .app-header-wrapper {
    background: #2d2d2d;
    border-bottom-color: #444;
}

html[data-theme="dark"] .sidebar {
    background: #2d2d2d;
    border-right-color: #444;
}

html[data-theme="dark"] .sidebar-header {
    border-bottom-color: #444;
}

html[data-theme="dark"] .sidebar-header h3 {
    color: #e0e0e0;
}

html[data-theme="dark"] .btn-create-project {
    background: #667eea;
    color: white;
}

html[data-theme="dark"] .btn-create-project:hover {
    background: #5a67d8;
}

html[data-theme="dark"] .project-item {
    color: #d0d0d0;
}

html[data-theme="dark"] .project-item:hover {
    background: #333;
}

html[data-theme="dark"] .project-item.active {
    background: #667eea;
    color: white;
}

html[data-theme="dark"] .main-content-wrapper {
    background: #1a1a1a;
}

html[data-theme="dark"] .form-section {
    background: #2d2d2d;
    border-color: #444;
}

html[data-theme="dark"] .form-grid {
    background: transparent;
}

html[data-theme="dark"] .no-project-message {
    background: #2d2d2d;
    border-color: #444;
    color: #999;
}

html[data-theme="dark"] .kanban-board {
    background: #1a1a1a;
}

html[data-theme="dark"] .kanban-column {
    background: #2d2d2d;
    border-color: #444;
}

html[data-theme="dark"] .kanban-column-header {
    color: #e0e0e0;
}

html[data-theme="dark"] .task-card {
    background: #333;
    border-color: #444;
    color: #d0d0d0;
}

html[data-theme="dark"] .task-card:hover {
    background: #3a3a3a;
}

html[data-theme="dark"] .task-title {
    color: #e0e0e0;
}

html[data-theme="dark"] .task-description {
    color: #b0b0b0;
}

html[data-theme="dark"] .modal {
    background: #2d2d2d;
    border-color: #444;
}

html[data-theme="dark"] .modal-box {
    background: #2d2d2d;
}

html[data-theme="dark"] .project-modal {
    background: rgba(0, 0, 0, 0.7);
}

html[data-theme="dark"] .project-box {
    background: #2d2d2d;
    border-color: #444;
}

html[data-theme="dark"] .project-box h3 {
    color: #e0e0e0;
}

html[data-theme="dark"] .btn-row .btn-auth {
    background: #667eea;
    color: white;
}

html[data-theme="dark"] .notification-bell {
    color: #d0d0d0;
}

html[data-theme="dark"] .notification-dropdown {
    background: #2d2d2d;
    border-color: #444;
}

html[data-theme="dark"] .notification-dropdown-header {
    color: #e0e0e0;
    border-bottom-color: #444;
}

html[data-theme="dark"] .notification-item {
    border-bottom-color: #444;
}

html[data-theme="dark"] .notification-item:hover {
    background: #333;
}

html[data-theme="dark"] .notification-type {
    color: #e0e0e0;
}

html[data-theme="dark"] .notification-message {
    color: #b0b0b0;
}

html[data-theme="dark"] .notification-timestamp {
    color: #888;
}

html[data-theme="dark"] .btn-edit-profile,
html[data-theme="dark"] .btn-logout {
    background: #444;
    color: #d0d0d0;
    border-color: #555;
}

html[data-theme="dark"] .btn-edit-profile:hover,
html[data-theme="dark"] .btn-logout:hover {
    background: #555;
}

html[data-theme="dark"] .stat-card {
    background: #2d2d2d;
    border-color: #444;
}

html[data-theme="dark"] .stat-label {
    color: #999;
}

html[data-theme="dark"] .stat-value {
    color: #667eea;
}

html[data-theme="dark"] .status-badge {
    background: #333;
    color: #b0b0b0;
}

html[data-theme="dark"] .status-badge.to-do {
    background: #3a2a00;
    color: #ffb84d;
}

html[data-theme="dark"] .status-badge.in-progress {
    background: #001a3a;
    color: #66ccff;
}

html[data-theme="dark"] .status-badge.review {
    background: #2a0a3a;
    color: #d899ff;
}

html[data-theme="dark"] .status-badge.done {
    background: #0a2a1a;
    color: #66dd77;
}

html[data-theme="dark"] .stat-detail {
    color: #888;
}

html[data-theme="dark"] .dashboard-section {
    background: #2d2d2d;
    border-color: #444;
}

html[data-theme="dark"] .dashboard h1,
html[data-theme="dark"] .dashboard h2 {
    color: #e0e0e0;
}

html[data-theme="dark"] .overdue-task-item {
    background: #3a2a2a;
    border-left-color: #ff6666;
}

html[data-theme="dark"] .overdue-task-title {
    color: #ff8888;
}

html[data-theme="dark"] .overdue-task-date {
    color: #999;
}

html[data-theme="dark"] .progress-background {
    background: #333;
}

html[data-theme="dark"] .project-progress-name {
    color: #e0e0e0;
}

html[data-theme="dark"] .progress-label {
    color: #999;
}

html[data-theme="dark"] .user-stat-item {
    background: #333;
    border-color: #444;
}

html[data-theme="dark"] .user-stat-name {
    color: #e0e0e0;
}

html[data-theme="dark"] .user-stat-progress {
    color: #667eea;
}

html[data-theme="dark"] .user-stat-detail {
    color: #999;
}

html[data-theme="dark"] .activity-log {
    background: transparent;
}

html[data-theme="dark"] .activity-item {
    background: #333;
    border-left-color: #667eea;
}

html[data-theme="dark"] .activity-action {
    color: #e0e0e0;
}

html[data-theme="dark"] .activity-detail {
    color: #999;
}

html[data-theme="dark"] .empty-state {
    color: #888;
}

html[data-theme="dark"] .current-project-header {
    background: #2d2d2d;
    border-bottom-color: #444;
}

html[data-theme="dark"] .current-project-name {
    color: #e0e0e0;
}

html[data-theme="dark"] .current-project-desc {
    color: #999;
}

html[data-theme="dark"] .btn-invite,
html[data-theme="dark"] .btn-manage-members {
    background: #667eea;
    color: white;
    border-color: #667eea;
}

html[data-theme="dark"] .btn-invite:hover,
html[data-theme="dark"] .btn-manage-members:hover {
    background: #5a67d8;
    border-color: #5a67d8;
}

html[data-theme="dark"] .btn-dashboard {
    background: #667eea;
    color: white;
}

html[data-theme="dark"] .btn-dashboard:hover {
    background: #5a67d8;
}

html[data-theme="dark"] .role-badge {
    border-color: #444;
}

html[data-theme="dark"] .role-badge-admin {
    background: #1a2a5a;
    color: #88ccff;
    border-color: #334488;
}

html[data-theme="dark"] .role-badge-member {
    background: #333;
    color: #999;
    border-color: #444;
}

html[data-theme="dark"] .member-item {
    background: #333;
    border-color: #444;
}

html[data-theme="dark"] .member-details h4 {
    color: #e0e0e0;
}

html[data-theme="dark"] .member-details p {
    color: #999;
}

html[data-theme="dark"] .member-role {
    background: #333;
    color: #b0b0b0;
}

html[data-theme="dark"] .member-role.admin {
    background: #1a2a5a;
    color: #88ccff;
}

html[data-theme="dark"] .role-select {
    background: #333;
    color: #d0d0d0;
    border-color: #444;
}

html[data-theme="dark"] .sidebar-dashboard-btn {
    border-bottom-color: #444;
}

html[data-theme="dark"] .tasks-header {
    border-bottom-color: #444;
}

html[data-theme="dark"] .task-count {
    color: #d0d0d0;
}

html[data-theme="dark"] .filter-section {
    border-bottom-color: #444;
}

html[data-theme="dark"] .filter-btn {
    background: #333;
    color: #d0d0d0;
    border-color: #444;
}

html[data-theme="dark"] .filter-btn.active {
    background: #667eea;
    color: white;
    border-color: #667eea;
}

html[data-theme="dark"] .filter-btn:hover {
    background: #3a3a3a;
}

/* Theme Toggle Button */
.btn-toggle-theme {
    width: 40px;
    height: 40px;
    border: none;
    background: #f0f0f0;
    color: #111;
    border-radius: 12px;
    cursor: pointer;
    font-size: 1.15rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease, color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    margin: 0 8px;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
}

.btn-toggle-theme:hover {
    background: #e8e8e8;
    transform: scale(1.05);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
}

.btn-toggle-theme:active {
    transform: scale(0.98) rotate(4deg);
}

.btn-toggle-theme::before {
    content: '☀';
    display: inline-block;
    transition: transform 0.3s ease, filter 0.3s ease;
}

.btn-toggle-theme:active::before {
    transform: rotate(15deg) scale(0.95);
}

html[data-theme="dark"] .btn-toggle-theme {
    background: #444;
    color: #d0d0d0;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18);
}

html[data-theme="dark"] .btn-toggle-theme:hover {
    background: #555;
}

html[data-theme="dark"] .btn-toggle-theme::before {
    content: '☾';
}