/* Revision Boards Page Styles */

.boards-container {
    min-height: calc(100vh - 70px);
    padding: 60px 20px 80px;
}

.page-header {
    text-align: center;
    margin-bottom: 40px;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.page-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

/* Actions Bar */
.boards-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    gap: 20px;
    flex-wrap: wrap;
}

.boards-filters {
    display: flex;
    gap: 15px;
    align-items: center;
}

/* Custom Select Dropdown */
.custom-select {
    position: relative;
    min-width: 180px;
}

.select-trigger {
    padding: 12px 40px 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    color: var(--text-primary);
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 10px;
    position: relative;
    user-select: none;
}

.select-trigger:hover {
    border-color: var(--accent-primary);
}

.select-trigger.active {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(167, 139, 250, 0.1);
}

.select-trigger::after {
    content: '';
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 5px solid var(--text-primary);
    transition: var(--transition);
}

.select-trigger.active::after {
    transform: translateY(-50%) rotate(180deg);
}

.select-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    box-shadow: 0 10px 30px var(--shadow);
    max-height: 300px;
    overflow-y: auto;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
}

.select-dropdown.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.select-option {
    padding: 12px 16px;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-primary);
}

.select-option:hover {
    background: rgba(167, 139, 250, 0.1);
    color: var(--accent-primary);
}

.select-option.selected {
    background: var(--accent-gradient);
    color: white;
    font-weight: 600;
}

.view-toggle {
    display: flex;
    gap: 5px;
    background: var(--card-bg);
    padding: 5px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.view-btn {
    padding: 8px 16px;
    background: transparent;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

.view-btn:hover {
    color: var(--text-primary);
}

.view-btn.active {
    background: var(--accent-gradient);
    color: white;
}

/* Loading State */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    gap: 20px;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Error State */
.error-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    gap: 15px;
    text-align: center;
}

.error-state i {
    font-size: 3rem;
    color: #F56565;
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 20px;
    gap: 20px;
    text-align: center;
}

.empty-state i {
    font-size: 4rem;
    color: var(--text-secondary);
}

.empty-state h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
}

.empty-state p {
    color: var(--text-secondary);
}

/* Boards Grid */
.boards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 25px;
}

.boards-grid.list-view {
    grid-template-columns: 1fr;
}

/* Board Card */
.board-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 25px;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
}

.board-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px var(--shadow);
    border-color: var(--accent-primary);
}

.board-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 15px;
}

.board-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.board-subject {
    display: inline-block;
    padding: 4px 12px;
    background: var(--accent-gradient);
    color: white;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.board-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 15px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.board-meta {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px 0;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.board-meta span {
    display: flex;
    align-items: center;
    gap: 5px;
}

.board-meta i {
    color: var(--accent-primary);
}

.board-actions {
    display: flex;
    gap: 10px;
    margin-top: 15px;
}

.board-actions button {
    flex: 1;
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background: transparent;
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.board-actions button:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.board-actions .delete-btn:hover {
    border-color: #F56565;
    color: #F56565;
}

.board-badge {
    position: absolute;
    top: 15px;
    right: 15px;
    padding: 4px 10px;
    background: rgba(16, 185, 129, 0.2);
    border: 1px solid rgba(16, 185, 129, 0.4);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    color: #10B981;
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.3s ease;
}

.modal-large {
    max-width: 1200px;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: 25px 30px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    padding: 5px;
    width: 35px;
    height: 35px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
}

.modal-close:hover {
    background: rgba(255, 0, 0, 0.1);
    color: #F56565;
}

.modal-body {
    padding: 30px;
}

.form-group {
    margin-bottom: 24px;
}

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

.form-input,
.form-textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

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

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(167, 139, 250, 0.1);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    color: var(--text-primary);
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.modal-actions {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
    margin-top: 30px;
}

/* Editor Toolbar */
.editor-toolbar {
    display: flex;
    gap: 10px;
    padding: 15px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.toolbar-btn {
    padding: 10px 16px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
}

.toolbar-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.toolbar-btn.active {
    background: var(--accent-gradient);
    color: white;
    border-color: transparent;
}

/* Editor Content */
.editor-content {
    min-height: 400px;
    padding: 20px;
    background: var(--bg-secondary);
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    margin-bottom: 20px;
}

/* Rich Text Editor Item */
.editor-item {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 0;
    margin-bottom: 15px;
    position: relative;
    transition: var(--transition);
}

.editor-item:hover {
    border-color: var(--accent-primary);
}

.editor-item.editing {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(167, 139, 250, 0.1);
}

.editor-item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 15px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    border-radius: 12px 12px 0 0;
}

.editor-item-type {
    font-weight: 600;
    color: var(--accent-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
}

.editor-item-actions {
    display: flex;
    gap: 8px;
}

.editor-item-actions button {
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 6px 12px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

.editor-item-actions button:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.editor-item-actions .delete:hover {
    border-color: #F56565;
    color: #F56565;
}

/* Rich Text Content */
.rich-text-editor {
    padding: 20px;
    min-height: 100px;
    outline: none;
    color: var(--text-primary);
    line-height: 1.8;
}

.rich-text-editor:empty:before {
    content: attr(data-placeholder);
    color: var(--text-secondary);
    font-style: italic;
}

.rich-text-toolbar {
    display: flex;
    gap: 8px;
    padding: 10px 15px;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.text-tool-btn {
    padding: 6px 10px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-primary);
    transition: var(--transition);
    font-size: 0.9rem;
    min-width: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.text-tool-btn:hover {
    border-color: var(--accent-primary);
    background: rgba(167, 139, 250, 0.1);
}

.text-tool-btn.active {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

.text-tool-separator {
    width: 1px;
    height: 24px;
    background: var(--border-color);
    margin: 0 4px;
}

/* Color Picker */
.color-picker-wrapper {
    position: relative;
}

.color-preview {
    width: 24px;
    height: 24px;
    border-radius: 4px;
    border: 2px solid var(--border-color);
    cursor: pointer;
}

.color-picker {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 8px;
    padding: 12px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 8px 20px var(--shadow);
    z-index: 1000;
    display: none;
}

.color-picker.active {
    display: block;
}

.color-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
}

.color-swatch {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
}

.color-swatch:hover {
    transform: scale(1.1);
    border-color: var(--accent-primary);
}

/* Font Size Picker */
.font-size-picker {
    position: relative;
}

.font-size-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    margin-top: 8px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 8px 20px var(--shadow);
    z-index: 1000;
    display: none;
    min-width: 120px;
}

.font-size-dropdown.active {
    display: block;
}

.font-size-option {
    padding: 8px 16px;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-primary);
}

.font-size-option:hover {
    background: rgba(167, 139, 250, 0.1);
}

/* Flashcard Item */
.flashcard-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    padding: 20px;
}

.flashcard-side {
    padding: 15px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    min-height: 100px;
}

.flashcard-label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.flashcard-input {
    width: 100%;
    border: none;
    background: transparent;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    resize: vertical;
    min-height: 60px;
    font-family: inherit;
}

/* Link Item */
.link-content {
    padding: 20px;
}

.link-input-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.link-input {
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 0.95rem;
}

.link-input:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.link-display {
    color: var(--text-primary);
}

.link-display a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: var(--transition);
}

.link-display a:hover {
    text-decoration: underline;
}

/* Confirmation Dialog */
.confirmation-dialog {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    padding: 30px;
    max-width: 400px;
    width: 90%;
    z-index: 10001;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.3s ease;
}

.confirmation-dialog h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.confirmation-dialog p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
}

.confirmation-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.confirmation-actions button {
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-cancel {
    background: transparent;
    border: 2px solid var(--border-color);
    color: var(--text-primary);
}

.btn-cancel:hover {
    border-color: var(--accent-primary);
}

.btn-confirm {
    background: #F56565;
    border: 2px solid #F56565;
    color: white;
}

.btn-confirm:hover {
    background: #E53E3E;
    border-color: #E53E3E;
}

/* Responsive Design */
@media (max-width: 768px) {
    .boards-container {
        padding: 40px 15px 60px;
    }

    .page-title {
        font-size: 2rem;
    }

    .boards-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .boards-filters {
        flex-direction: column;
    }

    .custom-select {
        width: 100%;
    }

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

    .modal-content {
        margin: 0;
        max-height: 100vh;
        border-radius: 0;
    }

    .modal-body {
        padding: 20px;
    }

    .flashcard-content {
        grid-template-columns: 1fr;
    }

    .editor-toolbar {
        flex-direction: column;
    }

    .toolbar-btn {
        justify-content: center;
    }

    .rich-text-toolbar {
        flex-wrap: wrap;
    }
}

@media (max-width: 480px) {
    .page-title {
        font-size: 1.75rem;
    }

    .board-card {
        padding: 20px 15px;
    }

    .board-actions {
        flex-direction: column;
    }

    .modal-actions {
        flex-direction: column;
    }

    .modal-actions button {
        width: 100%;
    }
}