/* SparkSheets Sheet Panel - Same World View */
/* Slides in from left, main content responds */

/* ============================================
   CSS Variables
   ============================================ */
:root {
    --sheet-panel-width: 280px;
    --sheet-card-radius: 12px;
    --sheet-transition-fast: 0.15s ease;
    --sheet-transition-normal: 0.25s ease-out;
    --sheet-transition-slow: 0.3s ease-out;
}

/* ============================================
   Main Content Push Effect
   ============================================ */
body {
    --sheet-panel-offset: 0px;
}

body.sheet-panel-open {
    --sheet-panel-offset: var(--sheet-panel-width);
}

/* Main content area shrinks when panel opens (like Chrome DevTools) */
body.sheet-panel-open .craft-card-wrapper {
    padding-left: calc(var(--sheet-panel-width) + 32px); /* panel width + gap (16px) + original padding (16px) */
    transition: padding-left var(--sheet-transition-normal);
}

.craft-card-wrapper {
    transition: padding-left var(--sheet-transition-normal);
}

/* Ensure the card inside scales properly */
body.sheet-panel-open .craft-card {
    width: 100%;
}

/* ============================================
   Main Panel - Same style as content cards
   ============================================ */
.sheet-panel {
    position: fixed;
    top: 28px; /* Match .craft-card-wrapper.has-sheet-name padding-top */
    left: 16px;
    height: calc(100vh - 44px); /* Match .craft-card when has-sheet-name: 100vh - 28px(top) - 16px(bottom) */
    bottom: auto;
    width: var(--sheet-panel-width);
    background: var(--main-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg, 12px);
    transform: translateX(calc(-100% - 40px));
    transition: transform var(--sheet-transition-normal);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    overflow: visible;
    box-sizing: border-box;
}

.sheet-panel.active {
    transform: translateX(0);
}

/* ============================================
   Header Section
   ============================================ */
.sheet-panel-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 12px;
    flex-shrink: 0;
    overflow: visible;  /* ドロップダウンメニュー表示のため */
    box-sizing: border-box;
}

.sheet-panel-title-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sheet-panel-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-color);
    margin: 0;
    display: flex;
    align-items: center;
    gap: 8px;
}

.sheet-panel-title .material-icons {
    font-size: 18px;
    color: var(--text-muted-color);
}

/* Current sheet name (double-click to rename) */
.sheet-panel-current-name {
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 4px;
    transition: all var(--sheet-transition-fast);
    max-width: 160px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sheet-panel-current-name:hover {
    background: var(--hover-bg, rgba(0,0,0,0.05));
}

/* Double-click hint for sheet items */
.sheet-list-item,
.sheet-grid-item {
    cursor: pointer;
}

.sheet-panel-close {
    background: none;
    border: none;
    padding: 6px;
    cursor: pointer;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted-color);
    transition: all var(--sheet-transition-fast);
}

.sheet-panel-close:hover {
    background: var(--hover-bg, rgba(0,0,0,0.05));
    color: var(--text-color);
}

.sheet-panel-close .material-icons {
    font-size: 18px;
}

/* Search Box */
.sheet-panel-search {
    position: relative;
}

.sheet-panel-search input {
    width: 100%;
    padding: 8px 12px 8px 36px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--main-bg);
    color: var(--text-color);
    font-size: 13px;
    outline: none;
    transition: border-color var(--sheet-transition-fast), box-shadow var(--sheet-transition-fast);
    box-sizing: border-box;
}

.sheet-panel-search input:focus {
    border-color: var(--accent-color, #3B82F6);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.sheet-panel-search input::placeholder {
    color: var(--text-muted-color);
}

.sheet-panel-search .material-icons {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 18px;
    color: var(--text-muted-color);
}

/* View Toggle & New Sheet Button */
.sheet-panel-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sheet-panel-view-toggle {
    display: flex;
    background: var(--hover-bg, rgba(0,0,0,0.03));
    border-radius: 6px;
    padding: 2px;
}

.sheet-panel-view-toggle button {
    background: none;
    border: none;
    padding: 6px 10px;
    cursor: pointer;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted-color);
    transition: all var(--sheet-transition-fast);
}

.sheet-panel-view-toggle button:hover {
    color: var(--text-color);
}

.sheet-panel-view-toggle button.active {
    background: var(--main-bg);
    color: var(--text-color);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.sheet-panel-view-toggle .material-icons {
    font-size: 18px;
}

.sheet-panel-new-btn {
    background: var(--accent-color, #3B82F6);
    border: none;
    padding: 6px 12px;
    cursor: pointer;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 4px;
    color: white;
    font-size: 12px;
    font-weight: 500;
    transition: all var(--sheet-transition-fast);
}

.sheet-panel-new-btn:hover {
    background: var(--accent-hover, #2563EB);
}

.sheet-panel-new-btn .material-icons {
    font-size: 16px;
}

.sheet-panel-new-btn .dropdown-arrow {
    font-size: 18px;
    margin-left: -2px;
    margin-right: -4px;
}

/* New Button Dropdown */
.sheet-panel-new-wrapper {
    position: relative;
    z-index: 100;  /* sheet-panel-listより上に表示 */
}

.sheet-panel-new-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 4px;
    background: var(--bg-primary, #fff);
    border: 1px solid var(--border-color, #e5e7eb);
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    min-width: 200px;
    z-index: 1000;
    padding: 9px;
    white-space: nowrap;
}

.new-menu-item {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 8px 7px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-primary, #1f2937);
    border-radius: 6px;
    transition: background 0.15s;
}

.new-menu-item:hover {
    background: var(--hover-bg, #f3f4f6);
}

.new-menu-item .material-icons {
    font-size: 18px;
    color: var(--text-secondary, #6b7280);
}

/* Folder Creation Modal */
.sheet-folder-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
}

.sheet-folder-modal {
    background: var(--bg-primary, #fff);
    border-radius: 14px;
    padding: 24px;
    min-width: 300px;
    max-width: 90vw;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
}

.sheet-folder-modal-title {
    font-size: 17px;
    font-weight: 600;
    margin: 0 0 16px 0;
    color: var(--text-primary, #1f2937);
    text-align: center;
}

.sheet-folder-modal-input {
    width: 100%;
    padding: 12px 14px;
    font-size: 15px;
    border: 1px solid var(--border-color, #d1d5db);
    border-radius: 10px;
    outline: none;
    box-sizing: border-box;
    background: var(--bg-secondary, #f9fafb);
    color: var(--text-primary, #1f2937);
}

.sheet-folder-modal-input:focus {
    border-color: var(--accent-color, #3B82F6);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.sheet-folder-modal-input::placeholder {
    color: var(--text-tertiary, #9ca3af);
}

.sheet-folder-modal-buttons {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 20px;
}

.sheet-folder-modal-btn {
    padding: 8px 16px;
    font-size: 15px;
    font-weight: 500;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.15s;
    background: transparent;
}

.sheet-folder-modal-btn.cancel {
    color: var(--accent-color, #3B82F6);
}

.sheet-folder-modal-btn.cancel:hover {
    background: rgba(59, 130, 246, 0.1);
}

.sheet-folder-modal-btn.create {
    color: var(--accent-color, #3B82F6);
}

.sheet-folder-modal-btn.create:hover {
    background: rgba(59, 130, 246, 0.1);
}

/* ============================================
   Sheet List
   ============================================ */
.sheet-panel-list {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 12px;
    position: relative;
    z-index: 1;  /* sheet-panel-new-menuより下に表示 */
}

/* Scrollbar styling */
.sheet-panel-list::-webkit-scrollbar {
    width: 6px;
}

.sheet-panel-list::-webkit-scrollbar-track {
    background: transparent;
}

.sheet-panel-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.sheet-panel-list::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted-color);
}

/* ============================================
   List View
   ============================================ */
.sheet-list-view {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sheet-list-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    background: transparent;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background var(--sheet-transition-fast);
    text-align: left;
    width: 100%;
    box-sizing: border-box;
    max-width: 100%;
    overflow: hidden;
}

.sheet-list-item:hover {
    background: var(--hover-bg, rgba(0,0,0,0.05));
}

.sheet-list-item.active {
    background: rgba(59, 130, 246, 0.1);
}

.sheet-list-icon {
    width: 32px;
    height: 32px;
    background: var(--hover-bg, rgba(0,0,0,0.05));
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.sheet-list-icon .material-icons {
    font-size: 18px;
    color: var(--text-muted-color);
}

.sheet-list-item.active .sheet-list-icon {
    background: var(--accent-color, #3B82F6);
}

.sheet-list-item.active .sheet-list-icon .material-icons {
    color: white;
}

.sheet-list-info {
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

.sheet-list-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 2px;
}

.sheet-list-meta {
    font-size: 11px;
    color: var(--text-muted-color);
}

.sheet-list-more {
    background: none;
    border: none;
    padding: 4px;
    cursor: pointer;
    border-radius: 4px;
    color: var(--text-muted-color);
    opacity: 0;
    transition: all var(--sheet-transition-fast);
}

.sheet-list-item:hover .sheet-list-more {
    opacity: 1;
}

.sheet-list-more:hover {
    color: var(--text-color);
}

.sheet-list-more .material-icons {
    font-size: 18px;
}

/* ============================================
   Grid View
   ============================================ */
.sheet-grid-view {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.sheet-grid-item {
    background: var(--main-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 0;
    cursor: pointer;
    transition: all var(--sheet-transition-fast);
    overflow: hidden;
    text-align: left;
}

.sheet-grid-item:hover {
    border-color: var(--accent-color, #3B82F6);
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.sheet-grid-item.active {
    border-color: var(--accent-color, #3B82F6);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.sheet-grid-preview {
    height: 60px;
    background: var(--hover-bg, rgba(0,0,0,0.02));
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.sheet-grid-preview .material-icons {
    font-size: 24px;
    color: var(--text-muted-color);
    opacity: 0.5;
}

.sheet-grid-content {
    padding: 10px;
}

.sheet-grid-name {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 4px;
}

.sheet-grid-meta {
    font-size: 10px;
    color: var(--text-muted-color);
}

.sheet-grid-more {
    position: absolute;
    top: 6px;
    right: 6px;
    background: var(--main-bg);
    border: none;
    padding: 4px;
    cursor: pointer;
    border-radius: 4px;
    color: var(--text-muted-color);
    opacity: 0;
    transition: all var(--sheet-transition-fast);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.sheet-grid-item:hover .sheet-grid-more {
    opacity: 1;
}

.sheet-grid-more:hover {
    background: var(--hover-bg, #f3f4f6);
    color: var(--text-color);
}

.sheet-grid-more .material-icons {
    font-size: 16px;
}

/* Hidden state for view toggle */
.sheet-list-view.hidden,
.sheet-grid-view.hidden {
    display: none;
}

/* ============================================
   Empty State
   ============================================ */
.sheet-panel-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    text-align: center;
    color: var(--text-muted-color);
}

.sheet-panel-empty .material-icons {
    font-size: 48px;
    margin-bottom: 12px;
    opacity: 0.3;
}

.sheet-panel-empty p {
    font-size: 13px;
    margin: 0;
}

/* ============================================
   Context Menu
   ============================================ */
.sheet-context-menu {
    position: fixed;
    background: var(--main-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.12);
    padding: 4px;
    min-width: 200px;
    max-width: 260px;
    z-index: 10001;
    opacity: 0;
    visibility: hidden;
    transform: scale(0.95);
    transition: all var(--sheet-transition-fast);
    box-sizing: border-box;
    overflow: visible;
}

.sheet-context-menu.active {
    opacity: 1;
    visibility: visible;
    transform: scale(1);
}

.sheet-context-menu-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border: none;
    background: none;
    width: 100%;
    max-width: 100%;
    text-align: left;
    cursor: pointer;
    border-radius: 6px;
    font-size: 13px;
    color: var(--text-color);
    white-space: nowrap;
    box-sizing: border-box;
    transition: background var(--sheet-transition-fast);
}

.sheet-context-menu-item > span:nth-child(2) {
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
    min-width: 0;
}

.sheet-context-menu-item:hover {
    background: var(--hover-bg, rgba(0,0,0,0.05));
}

.sheet-context-menu-item .material-icons {
    font-size: 18px;
    color: var(--text-muted-color);
}

.sheet-context-menu-item.danger {
    color: #EF4444;
}

.sheet-context-menu-item.danger .material-icons {
    color: #EF4444;
}

.sheet-context-menu-divider {
    height: 1px;
    background: var(--border-color);
    margin: 4px 0;
}

/* ============================================
   Footer
   ============================================ */
.sheet-panel-footer {
    padding: 12px 16px;
    border-top: 1px solid var(--border-color);
    font-size: 11px;
    color: var(--text-muted-color);
    text-align: center;
}

/* ============================================
   Animations
   ============================================ */
@keyframes boardCardFadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.sheet-list-item,
.sheet-grid-item {
    animation: boardCardFadeIn 0.2s ease forwards;
}

.sheet-list-item:nth-child(1),
.sheet-grid-item:nth-child(1) { animation-delay: 0.02s; }
.sheet-list-item:nth-child(2),
.sheet-grid-item:nth-child(2) { animation-delay: 0.04s; }
.sheet-list-item:nth-child(3),
.sheet-grid-item:nth-child(3) { animation-delay: 0.06s; }
.sheet-list-item:nth-child(4),
.sheet-grid-item:nth-child(4) { animation-delay: 0.08s; }
.sheet-list-item:nth-child(5),
.sheet-grid-item:nth-child(5) { animation-delay: 0.1s; }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    :root {
        --sheet-panel-width: 260px;
    }

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

@media (max-width: 480px) {
    :root {
        --sheet-panel-width: 100%;
    }

    .sheet-panel {
        top: 0;
        left: 0;
        bottom: 0;
        border-radius: 0;
        border: none;
        border-right: 1px solid var(--border-color);
    }

    body.sheet-panel-open #app {
        margin-left: 0;
        transform: translateX(80%);
    }
}

/* ============================================
   Settings Icon (Board Cards)
   ============================================ */
.sheet-list-settings {
    background: none;
    border: none;
    padding: 4px;
    cursor: pointer;
    border-radius: 4px;
    color: var(--text-muted-color);
    opacity: 0;
    transition: all var(--sheet-transition-fast);
}

.sheet-list-item:hover .sheet-list-settings {
    opacity: 1;
}

.sheet-list-settings:hover {
    background: var(--hover-bg, rgba(0,0,0,0.1));
    color: var(--text-color);
}

.sheet-list-settings .material-icons {
    font-size: 16px;
}

.sheet-grid-settings {
    position: absolute;
    top: 6px;
    right: 32px;
    background: var(--main-bg);
    border: none;
    padding: 4px;
    cursor: pointer;
    border-radius: 4px;
    color: var(--text-muted-color);
    opacity: 0;
    transition: all var(--sheet-transition-fast);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.sheet-grid-item:hover .sheet-grid-settings {
    opacity: 1;
}

.sheet-grid-settings:hover {
    background: var(--hover-bg, #f3f4f6);
    color: var(--text-color);
}

.sheet-grid-settings .material-icons {
    font-size: 14px;
}

/* ============================================
   Modal Overlay
   ============================================ */
.sheet-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    z-index: 10002;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--sheet-transition-fast);
}

.sheet-modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ============================================
   Modal Container
   ============================================ */
.sheet-modal {
    background: var(--main-bg);
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
    width: 90%;
    max-width: 400px;
    transform: scale(0.95);
    transition: transform var(--sheet-transition-fast);
    overflow: hidden;
}

.sheet-modal-overlay.active .sheet-modal {
    transform: scale(1);
}

.sheet-modal-share {
    max-width: 460px;
}

/* Modal Header */
.sheet-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
}

.sheet-modal-header h4 {
    margin: 0;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-color);
}

.sheet-modal-close {
    background: none;
    border: none;
    padding: 4px;
    cursor: pointer;
    border-radius: 6px;
    color: var(--text-muted-color);
    transition: all var(--sheet-transition-fast);
}

.sheet-modal-close:hover {
    background: var(--hover-bg, rgba(0,0,0,0.05));
    color: var(--text-color);
}

.sheet-modal-close .material-icons {
    font-size: 20px;
}

/* Modal Body */
.sheet-modal-body {
    padding: 20px;
}

.sheet-modal-input {
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--main-bg);
    color: var(--text-color);
    font-size: 14px;
    outline: none;
    transition: border-color var(--sheet-transition-fast), box-shadow var(--sheet-transition-fast);
    box-sizing: border-box;
}

.sheet-modal-input:focus {
    border-color: var(--accent-color, #3B82F6);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.sheet-modal-message {
    margin: 0 0 8px 0;
    font-size: 14px;
    color: var(--text-color);
}

.sheet-modal-warning {
    margin: 0;
    font-size: 13px;
    color: var(--text-muted-color);
}

/* Modal Footer */
.sheet-modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    padding: 12px 20px;
    border-top: 1px solid var(--border-color);
    background: var(--hover-bg, rgba(0,0,0,0.02));
}

.sheet-modal-btn {
    padding: 8px 16px;
    border: none;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--sheet-transition-fast);
}

.sheet-modal-btn.secondary {
    background: var(--hover-bg, rgba(0,0,0,0.05));
    color: var(--text-color);
}

.sheet-modal-btn.secondary:hover {
    background: var(--border-color);
}

.sheet-modal-btn.primary {
    background: var(--accent-color, #3B82F6);
    color: white;
}

.sheet-modal-btn.primary:hover {
    background: var(--accent-hover, #2563EB);
}

.sheet-modal-btn.danger {
    background: #EF4444;
    color: white;
}

.sheet-modal-btn.danger:hover {
    background: #DC2626;
}

/* ============================================
   Share Modal Specific
   ============================================ */
.sheet-share-sheet-name {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px;
    background: var(--hover-bg, rgba(0,0,0,0.03));
    border-radius: 8px;
    margin-bottom: 20px;
}

.sheet-share-sheet-name .material-icons {
    font-size: 20px;
    color: var(--text-muted-color);
}

.sheet-share-sheet-name span:last-child {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-color);
}

.sheet-share-section {
    margin-bottom: 20px;
}

.sheet-share-section:last-child {
    margin-bottom: 0;
}

.sheet-share-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.sheet-share-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sheet-share-option {
    display: flex;
    cursor: pointer;
}

.sheet-share-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.sheet-share-option-content {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px;
    background: var(--main-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    width: 100%;
    transition: all var(--sheet-transition-fast);
}

.sheet-share-option input[type="radio"]:checked + .sheet-share-option-content {
    border-color: var(--accent-color, #3B82F6);
    background: rgba(59, 130, 246, 0.05);
}

.sheet-share-option:hover .sheet-share-option-content {
    border-color: var(--accent-color, #3B82F6);
}

.sheet-share-option-content .material-icons {
    font-size: 20px;
    color: var(--text-muted-color);
    flex-shrink: 0;
    margin-top: 2px;
}

.sheet-share-option input[type="radio"]:checked + .sheet-share-option-content .material-icons {
    color: var(--accent-color, #3B82F6);
}

.sheet-share-option-content span:last-child {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.sheet-share-option-content strong {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-color);
}

.sheet-share-option-content small {
    font-size: 12px;
    color: var(--text-muted-color);
}

.sheet-share-link-row {
    display: flex;
    gap: 8px;
}

.sheet-share-link-input {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--hover-bg, rgba(0,0,0,0.02));
    color: var(--text-color);
    font-size: 13px;
    font-family: monospace;
}

.sheet-share-copy-btn {
    padding: 10px 14px;
    background: var(--hover-bg, rgba(0,0,0,0.05));
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--sheet-transition-fast);
}

.sheet-share-copy-btn:hover {
    background: var(--border-color);
}

.sheet-share-copy-btn .material-icons {
    font-size: 18px;
    color: var(--text-muted-color);
}

/* ============================================
   Dark Mode for Modals
   ============================================ */
body.dark-mode .sheet-modal-overlay {
    background: rgba(0, 0, 0, 0.6);
}

body.dark-mode .sheet-modal {
    background: var(--gray-800);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

body.dark-mode .sheet-share-option-content {
    background: var(--gray-800);
}

body.dark-mode .sheet-share-option input[type="radio"]:checked + .sheet-share-option-content {
    background: rgba(59, 130, 246, 0.1);
}

body.dark-mode .sheet-share-link-input {
    background: var(--gray-700);
}

body.dark-mode .sheet-share-copy-btn {
    background: var(--gray-700);
}

body.dark-mode .sheet-modal-footer {
    background: var(--gray-900);
}

body.dark-mode .sheet-modal-btn.secondary {
    background: var(--gray-700);
}

body.dark-mode .sheet-modal-btn.secondary:hover {
    background: var(--gray-600);
}

/* ============================================
   Trash Button & Badge
   ============================================ */
.sheet-panel-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sheet-panel-trash-btn {
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 6px 10px;
    background: transparent;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-muted-color);
    transition: all var(--sheet-transition-fast);
    position: relative;
}

.sheet-panel-trash-btn:hover {
    background: var(--hover-bg, rgba(0,0,0,0.05));
    color: var(--text-color);
}

.sheet-panel-trash-btn .material-icons {
    font-size: 18px;
}

.sheet-panel-trash-btn .trash-count {
    color: var(--text-muted, #888);
    font-size: 12px;
    font-weight: 500;
    display: inline-flex;
    align-items: center;
}

.sheet-panel-trash-btn.has-items .material-icons {
    color: var(--text-color);
}

/* ============================================
   Footer Usage Indicator (AI使用量)
   ============================================ */
.footer-usage-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 11px;
}

.footer-usage-indicator:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

.footer-usage-indicator .usage-icon {
    font-size: 14px;
    color: var(--accent-color, #2196f3);
}

.usage-mini-bar {
    width: 40px;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
}

.usage-mini-bar-fill {
    height: 100%;
    border-radius: 2px;
    transition: width 0.3s ease, background 0.3s ease;
    min-width: 2px;
}

.usage-mini-bar-fill.status-normal {
    background: linear-gradient(90deg, #22c55e, #4ade80);
}

.usage-mini-bar-fill.status-warning {
    background: linear-gradient(90deg, #f59e0b, #fbbf24);
}

.usage-mini-bar-fill.status-error {
    background: linear-gradient(90deg, #ef4444, #f87171);
}

.usage-mini-text {
    color: var(--text-muted-color);
    font-weight: 500;
    white-space: nowrap;
}

.footer-usage-indicator.usage-limit-reached {
    background: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
}

.footer-usage-indicator.usage-limit-reached .usage-icon {
    color: #ef4444;
}

.footer-usage-indicator.usage-limit-reached .usage-mini-text {
    color: #ef4444;
}

/* ============================================
   Trash View Mode
   ============================================ */
.sheet-panel.trash-mode .sheet-panel-title .material-icons {
    color: var(--accent-color, #EF4444);
}

/* Trash Header */
.sheet-trash-header {
    padding: 12px;
    background: rgba(239, 68, 68, 0.05);
    border: 1px solid rgba(239, 68, 68, 0.1);
    border-radius: 8px;
    margin-bottom: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.sheet-trash-notice {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0;
    font-size: 12px;
    color: var(--text-muted-color);
}

.sheet-trash-notice .material-icons {
    font-size: 16px;
    color: #F59E0B;
}

.sheet-trash-empty-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 12px;
    background: transparent;
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 6px;
    color: #EF4444;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--sheet-transition-fast);
}

.sheet-trash-empty-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: #EF4444;
}

.sheet-trash-empty-btn .material-icons {
    font-size: 16px;
}

/* Trash Item Styles */
.sheet-trash-item .sheet-list-icon.trashed {
    opacity: 0.5;
}

.sheet-trash-item .sheet-list-icon.trashed .material-icons {
    color: var(--text-muted-color);
}

.sheet-trash-item .trash-meta {
    display: flex;
    align-items: center;
    gap: 4px;
    color: #F59E0B;
}

.sheet-trash-item .trash-meta .material-icons {
    font-size: 12px;
}

/* Trash item hover */
.sheet-trash-item:hover {
    background: var(--hover-bg, rgba(0,0,0,0.03));
}

/* ============================================
   Dark Mode for Trash
   ============================================ */
body.dark-mode .sheet-trash-header {
    background: rgba(239, 68, 68, 0.08);
    border-color: rgba(239, 68, 68, 0.15);
}

body.dark-mode .sheet-trash-empty-btn {
    border-color: rgba(239, 68, 68, 0.4);
}

body.dark-mode .sheet-trash-empty-btn:hover {
    background: rgba(239, 68, 68, 0.15);
}

/* ============================================
   Sort Select Dropdown
   ============================================ */
.sheet-panel-sort {
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--main-bg);
    color: var(--text-color);
    font-size: 12px;
    cursor: pointer;
    outline: none;
    transition: border-color var(--sheet-transition-fast), box-shadow var(--sheet-transition-fast);
}

.sheet-panel-sort:hover {
    border-color: var(--primary-color, #007AFF);
}

.sheet-panel-sort:focus {
    border-color: var(--primary-color, #007AFF);
    box-shadow: 0 0 0 2px rgba(0, 122, 255, 0.2);
}

/* Dark mode sort */
body.dark-mode .sheet-panel-sort {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
}

body.dark-mode .sheet-panel-sort:hover,
body.dark-mode .sheet-panel-sort:focus {
    border-color: var(--primary-color, #007AFF);
}

/* ============================================
   Pinned Board Styles
   ============================================ */

/* Pin icon in list view */
.sheet-pin-icon {
    font-size: 14px !important;
    color: var(--primary-color, #007AFF);
    margin-right: 4px;
    vertical-align: middle;
}

/* Pin icon in grid view */
.sheet-grid-pin-icon {
    position: absolute;
    top: 8px;
    left: 8px;
    font-size: 16px !important;
    color: var(--primary-color, #007AFF);
    background: rgba(255, 255, 255, 0.9);
    border-radius: 4px;
    padding: 2px;
    z-index: 2;
}

body.dark-mode .sheet-grid-pin-icon {
    background: rgba(0, 0, 0, 0.6);
}

/* Pinned item subtle highlight */
.sheet-list-item.pinned {
    background: rgba(0, 122, 255, 0.04);
}

.sheet-list-item.pinned:hover {
    background: rgba(0, 122, 255, 0.08);
}

.sheet-grid-item.pinned .sheet-grid-preview {
    border: 2px solid var(--primary-color, #007AFF);
}

body.dark-mode .sheet-list-item.pinned {
    background: rgba(0, 122, 255, 0.08);
}

body.dark-mode .sheet-list-item.pinned:hover {
    background: rgba(0, 122, 255, 0.12);
}

/* Board list name with pin icon */
.sheet-list-name {
    display: flex;
    align-items: center;
}

/* ============================================
   Date Filter Button & Bar (Diary Feature)
   ============================================ */
.sheet-panel-date-filter {
    padding: 6px 8px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-muted-color);
    transition: all var(--sheet-transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.sheet-panel-date-filter:hover {
    border-color: var(--primary-color, #007AFF);
    color: var(--primary-color, #007AFF);
}

.sheet-panel-date-filter.active {
    background: var(--primary-color, #007AFF);
    border-color: var(--primary-color, #007AFF);
    color: white;
}

.sheet-panel-date-filter .material-icons {
    font-size: 18px;
}

/* Date Filter Bar */
.sheet-panel-date-bar {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 0;
    border-top: 1px solid var(--border-color);
    margin-top: 12px;
    max-width: 100%;
    box-sizing: border-box;
}

.sheet-date-inputs {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
    min-width: 0;
    max-width: 100%;
    overflow: hidden;
}

.sheet-date-start,
.sheet-date-end {
    flex: 1;
    min-width: 0;
    max-width: 90px;
    padding: 6px 6px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--main-bg);
    color: var(--text-color);
    font-size: 11px;
    outline: none;
    transition: border-color var(--sheet-transition-fast);
    box-sizing: border-box;
}

.sheet-date-start:focus,
.sheet-date-end:focus {
    border-color: var(--primary-color, #007AFF);
}

.sheet-date-separator {
    color: var(--text-muted-color);
    font-size: 12px;
}

.sheet-date-clear {
    padding: 6px;
    background: transparent;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    color: var(--text-muted-color);
    transition: all var(--sheet-transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.sheet-date-clear:hover {
    background: var(--hover-bg, rgba(0,0,0,0.05));
    color: var(--text-color);
}

.sheet-date-clear .material-icons {
    font-size: 16px;
}

/* Dark mode date filter */
body.dark-mode .sheet-panel-date-filter {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.15);
}

body.dark-mode .sheet-panel-date-filter:hover {
    border-color: var(--primary-color, #007AFF);
}

body.dark-mode .sheet-date-start,
body.dark-mode .sheet-date-end {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.15);
}

body.dark-mode .sheet-date-start:focus,
body.dark-mode .sheet-date-end:focus {
    border-color: var(--primary-color, #007AFF);
}

/* ============================================
   Sheet List Meta - Date Display (Diary)
   ============================================ */
.sheet-list-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.sheet-list-created,
.sheet-list-updated {
    display: flex;
    align-items: center;
    gap: 2px;
}

.sheet-list-created .material-icons,
.sheet-list-updated .material-icons {
    font-size: 12px;
    opacity: 0.7;
}

.sheet-list-created {
    color: var(--primary-color, #007AFF);
}

.sheet-list-updated {
    color: var(--text-muted-color);
}

/* ============================================
   Board Sections (Shared, Recent, All)
   ============================================ */
.sheet-section {
    margin-bottom: 8px;
}

.sheet-section:last-child {
    margin-bottom: 0;
}

.sheet-section-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    margin: 0 -12px;
    cursor: pointer;
    color: var(--text-muted-color);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: 6px;
    transition: all var(--sheet-transition-fast);
    user-select: none;
}

.sheet-section-header:hover {
    background: var(--hover-bg, rgba(0,0,0,0.03));
    color: var(--text-color);
}

.sheet-section-header .material-icons:first-child {
    font-size: 16px;
}

.sheet-section-count {
    background: var(--border-color);
    padding: 2px 6px;
    border-radius: 10px;
    font-size: 10px;
    color: var(--text-muted-color);
}

.sheet-section-toggle {
    margin-left: auto;
    font-size: 18px !important;
    opacity: 0.5;
    transition: transform var(--sheet-transition-fast);
}

.sheet-section.collapsed .sheet-section-toggle {
    transform: rotate(-90deg);
}

.sheet-section-content {
    overflow: hidden;
    transition: max-height var(--sheet-transition-normal);
}

/* フォルダコンテナはドラッグ時の境界線表示のためoverflow: visible */
.sheet-section-content.sheet-folder-container {
    overflow: visible;
    padding: 2px;
    margin: -2px;
}

.sheet-section.collapsed .sheet-section-content {
    max-height: 0 !important;
}

/* Section-specific icons */
.sheet-section-header[data-section="shared"] .material-icons:first-child {
    color: #22C55E;
}

.sheet-section-header[data-section="recent"] .material-icons:first-child {
    color: #F59E0B;
}

.sheet-section-header[data-section="all"] .material-icons:first-child {
    color: var(--primary-color, #007AFF);
}

/* Compact board item for sections */
.sheet-list-item.compact {
    padding: 8px 12px;
}

.sheet-list-item.compact .sheet-list-icon {
    width: 28px;
    height: 28px;
}

.sheet-list-item.compact .sheet-list-icon .material-icons {
    font-size: 16px;
}

.sheet-list-item.compact .sheet-list-name {
    font-size: 13px;
}

/* All boards section - always open */
.sheet-section-all .sheet-section-header {
    cursor: default;
}

.sheet-section-all .sheet-section-toggle {
    display: none;
}

/* Section separator */
.sheet-section:not(:last-child)::after {
    content: '';
    display: block;
    height: 1px;
    background: var(--border-color);
    margin: 8px 0;
    opacity: 0.5;
}

/* ============================================
   Dark Mode for Sections
   ============================================ */
body.dark-mode .sheet-section-header:hover {
    background: rgba(255, 255, 255, 0.05);
}

body.dark-mode .sheet-section-count {
    background: rgba(255, 255, 255, 0.1);
}

/* ============================================
   Inline Edit Input
   ============================================ */
.sheet-inline-edit {
    width: 100%;
    padding: 4px 8px;
    font-size: inherit;
    font-family: inherit;
    border: none;
    border-radius: 4px;
    background: transparent;
    color: var(--text-color, #333);
    outline: none;
    box-sizing: border-box;
}

/* Prevent text selection during editing */
.sheet-list-name:has(.sheet-inline-edit),
.sheet-grid-name:has(.sheet-inline-edit),
.sheet-panel-current-name:has(.sheet-inline-edit) {
    user-select: none;
}

/* Dark mode for inline edit */
body.dark-mode .sheet-inline-edit {
    background: transparent;
    color: var(--dark-text-primary, #f5f5f5);
}

/* Make current name in header editable appearance */
.sheet-panel-current-name {
    cursor: pointer;
    padding: 2px 4px;
    border-radius: 4px;
}

/* ============================================
   Tag Badges on Board Items
   ============================================ */
.sheet-list-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-top: 4px;
}

.sheet-tag-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 6px;
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-color, #3B82F6);
    border-radius: 10px;
    font-size: 10px;
    font-weight: 500;
    max-width: 60px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    cursor: pointer;
    transition: all var(--sheet-transition-fast);
}

.sheet-tag-badge:hover {
    background: rgba(59, 130, 246, 0.2);
}

.sheet-tag-more {
    display: inline-flex;
    align-items: center;
    padding: 2px 6px;
    background: var(--hover-bg, rgba(0,0,0,0.05));
    color: var(--text-muted-color);
    border-radius: 10px;
    font-size: 10px;
    font-weight: 500;
}

/* Dark mode tag badges */
body.dark-mode .sheet-tag-badge {
    background: rgba(59, 130, 246, 0.2);
}

body.dark-mode .sheet-tag-badge:hover {
    background: rgba(59, 130, 246, 0.3);
}

body.dark-mode .sheet-tag-more {
    background: rgba(255, 255, 255, 0.1);
}

/* ============================================
   Tag Management Modal
   ============================================ */
.tag-input-container {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.tag-input-container input {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--main-bg);
    color: var(--text-color);
    font-size: 13px;
    outline: none;
    transition: border-color var(--sheet-transition-fast), box-shadow var(--sheet-transition-fast);
}

.tag-input-container input:focus {
    border-color: var(--accent-color, #3B82F6);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.tag-input-container button {
    padding: 10px 16px;
    background: var(--accent-color, #3B82F6);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: background var(--sheet-transition-fast);
    display: flex;
    align-items: center;
    gap: 4px;
}

.tag-input-container button:hover {
    background: var(--accent-hover, #2563EB);
}

.tag-input-container button .material-icons {
    font-size: 16px;
}

/* Current tags list */
.current-tags-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    min-height: 32px;
    padding: 12px;
    background: var(--hover-bg, rgba(0,0,0,0.02));
    border-radius: 8px;
    margin-bottom: 16px;
}

.tag-item {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px 4px 10px;
    background: var(--accent-color, #3B82F6);
    color: white;
    border-radius: 16px;
    font-size: 12px;
    font-weight: 500;
}

.tag-remove-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    background: rgba(255, 255, 255, 0.2);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    padding: 0;
    transition: background var(--sheet-transition-fast);
}

.tag-remove-btn:hover {
    background: rgba(255, 255, 255, 0.4);
}

.tag-remove-btn .material-icons {
    font-size: 12px;
    color: white;
}

.no-tags-message {
    color: var(--text-muted-color);
    font-size: 12px;
    font-style: italic;
}

/* Suggested tags section */
.suggested-tags-section {
    margin-top: 16px;
}

.suggested-tags-section h5 {
    margin: 0 0 8px 0;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-muted-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.suggested-tags-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.suggested-tag {
    padding: 4px 10px;
    background: var(--hover-bg, rgba(0,0,0,0.05));
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    font-size: 12px;
    cursor: pointer;
    transition: all var(--sheet-transition-fast);
}

.suggested-tag:hover {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--accent-color, #3B82F6);
    color: var(--accent-color, #3B82F6);
}

/* Dark mode tag modal */
body.dark-mode .tag-input-container input {
    background: var(--gray-800);
    border-color: var(--gray-600);
}

body.dark-mode .current-tags-list {
    background: var(--gray-800);
}

body.dark-mode .suggested-tag {
    background: var(--gray-700);
    border-color: var(--gray-600);
}

body.dark-mode .suggested-tag:hover {
    background: rgba(59, 130, 246, 0.2);
}

/* ============================================
   Folder Management Modal
   ============================================ */
.folder-options-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 16px;
    max-height: 200px;
    overflow-y: auto;
}

.folder-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background: var(--main-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--sheet-transition-fast);
}

.folder-option:hover {
    border-color: var(--accent-color, #3B82F6);
}

.folder-option.selected {
    border-color: var(--accent-color, #3B82F6);
    background: rgba(59, 130, 246, 0.05);
}

.folder-option input[type="radio"] {
    margin: 0;
    accent-color: var(--accent-color, #3B82F6);
}

.folder-option .material-icons {
    font-size: 18px;
    color: var(--text-muted-color);
}

.folder-option.selected .material-icons {
    color: var(--accent-color, #3B82F6);
}

.folder-option span:last-child {
    font-size: 13px;
    color: var(--text-color);
}

.folder-option.no-folder {
    border-style: dashed;
}

/* New folder input */
.folder-create-section {
    display: flex;
    gap: 8px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

.folder-create-input {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--main-bg);
    color: var(--text-color);
    font-size: 13px;
    outline: none;
    transition: border-color var(--sheet-transition-fast), box-shadow var(--sheet-transition-fast);
}

.folder-create-input:focus {
    border-color: var(--accent-color, #3B82F6);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.folder-create-btn {
    padding: 10px 16px;
    background: var(--hover-bg, rgba(0,0,0,0.05));
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--sheet-transition-fast);
    display: flex;
    align-items: center;
    gap: 4px;
}

.folder-create-btn:hover {
    background: var(--accent-color, #3B82F6);
    border-color: var(--accent-color, #3B82F6);
    color: white;
}

.folder-create-btn .material-icons {
    font-size: 16px;
}

/* Dark mode folder modal */
body.dark-mode .folder-option {
    background: var(--gray-800);
    border-color: var(--gray-600);
}

body.dark-mode .folder-option:hover {
    border-color: var(--accent-color, #3B82F6);
}

body.dark-mode .folder-option.selected {
    background: rgba(59, 130, 246, 0.1);
}

body.dark-mode .folder-create-input {
    background: var(--gray-800);
    border-color: var(--gray-600);
}

body.dark-mode .folder-create-btn {
    background: var(--gray-700);
    border-color: var(--gray-600);
}

body.dark-mode .folder-create-btn:hover {
    background: var(--accent-color, #3B82F6);
    border-color: var(--accent-color, #3B82F6);
}

/* ============================================
   Folder Sections in Sheet List
   ============================================ */
.sheet-folder-section {
    margin-bottom: 12px;
}

.sheet-folder-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    margin: 0 -12px;
    cursor: pointer;
    color: var(--text-color);
    font-size: 12px;
    font-weight: 600;
    border-radius: 6px;
    transition: all var(--sheet-transition-fast);
    user-select: none;
}

/* フォルダヘッダーはホバー時に背景色変更しない */

.sheet-folder-header .material-icons:first-child {
    font-size: 18px;
    color: #F59E0B;
}

.sheet-folder-header .folder-name {
    flex: 1;
}

.sheet-folder-header .folder-count {
    background: var(--border-color);
    padding: 2px 6px;
    border-radius: 10px;
    font-size: 10px;
    color: var(--text-muted-color);
    font-weight: 500;
}

.sheet-folder-header .folder-delete {
    font-size: 16px !important;
    opacity: 0;
    color: var(--text-muted-color);
    cursor: pointer;
    padding: 2px;
    border-radius: 4px;
    transition: all var(--sheet-transition-fast);
}

.sheet-folder-header:hover .folder-delete {
    opacity: 0.5;
}

.sheet-folder-header .folder-delete:hover {
    opacity: 1 !important;
    color: #EF4444;
}

.sheet-folder-header .folder-toggle {
    font-size: 18px !important;
    opacity: 0.5;
    transition: transform var(--sheet-transition-fast);
}

.sheet-folder-section.collapsed .folder-toggle {
    transform: rotate(-90deg);
}

.sheet-folder-content {
    padding-left: 8px;
    overflow: hidden;
    transition: max-height var(--sheet-transition-normal);
}

.sheet-folder-section.collapsed .sheet-folder-content {
    max-height: 0 !important;
}

/* Dark mode folder sections */
body.dark-mode .sheet-folder-header .folder-count {
    background: rgba(255, 255, 255, 0.1);
}

/* ダークモードでもホバー背景なし */

/* ============================================
   Drag and Drop States
   ============================================ */
.sheet-list-item.dragging {
    opacity: 0.5;
    transform: scale(0.98);
    border: 2px dashed var(--accent-color, #3B82F6);
    background: rgba(59, 130, 246, 0.1);
}

.sheet-folder-header.drag-over {
    background: rgba(59, 130, 246, 0.15) !important;
    border: 2px dashed var(--accent-color, #3B82F6);
    border-radius: 8px;
    transform: scale(1.02);
    transition: all 0.15s ease;
}

.sheet-folder-header.drag-over .folder-icon {
    color: var(--accent-color, #3B82F6);
    animation: pulse-folder 0.5s ease infinite;
}

@keyframes pulse-folder {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

body.dark-mode .sheet-list-item.dragging {
    background: rgba(59, 130, 246, 0.2);
}

body.dark-mode .sheet-folder-header.drag-over {
    background: rgba(59, 130, 246, 0.25) !important;
}

/* ============================================
   Context Menu Submenu
   ============================================ */
.sheet-context-menu-item.has-submenu {
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    cursor: pointer;
    transition: background 0.15s ease;
    max-width: 100%;
    box-sizing: border-box;
    /* overflow: visible でサブメニューを表示可能に */
}

.sheet-context-menu-item.has-submenu > span:not(.material-icons):not(.submenu-arrow) {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sheet-context-menu-item.has-submenu:hover {
    background: var(--hover-bg, rgba(0,0,0,0.05));
}

.sheet-context-menu-item.has-submenu .submenu-arrow {
    font-size: 18px;
    color: var(--text-muted-color);
    margin-left: auto;
}

/* Submenu Container */
.sheet-context-submenu {
    position: absolute;
    left: calc(100% + 4px);
    top: 0;
    min-width: 200px;
    max-width: 300px;
    width: max-content;
    background: var(--bg-color, #fff);
    border: 1px solid var(--border-color, #e5e7eb);
    border-radius: 8px;
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
    padding: 4px;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-8px);
    transition: all 0.15s ease;
    z-index: 10002;
    max-height: 400px;
    overflow-y: auto;
}

/* Share Submenu - wider for more content */
.sheet-context-submenu.share-submenu {
    min-width: 220px;
    max-width: 320px;
}

/* Section Label in Submenu */
.submenu-section-label {
    padding: 8px 12px 4px;
    font-size: 10px;
    font-weight: 600;
    color: var(--text-muted-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Toggle Indicator */
.toggle-indicator {
    font-size: 18px;
    color: #10a37f;
    margin-left: auto;
}

.toggle-indicator:empty {
    width: 18px;
}

/* Toggle Item - hover effect */
.submenu-item.toggle-item:hover {
    background: var(--hover-bg, rgba(0,0,0,0.05));
}

/* Hover active state (programmatic) */
.sheet-context-menu-item.hover-active {
    background: var(--hover-bg, rgba(0,0,0,0.05));
}

.sheet-context-menu-item.hover-active > .sheet-context-submenu {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

/* Sheet Panel内のコンテキストメニューアイテムの幅制御 */
.sheet-panel .sheet-context-menu-item {
    max-width: 100%;
    box-sizing: border-box;
}

/* Submenu opens to left when near viewport edge */
.sheet-context-submenu.open-left {
    left: auto;
    right: calc(100% + 4px);
    transform: translateX(8px);
}

.sheet-context-menu-item.has-submenu:hover > .sheet-context-submenu.open-left {
    transform: translateX(0);
}

.sheet-context-menu-item.has-submenu:hover > .sheet-context-submenu {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

/* Submenu Header */
.submenu-header {
    padding: 8px 12px 6px;
    font-size: 10px;
    font-weight: 600;
    color: var(--text-muted-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-color, #e5e7eb);
    margin-bottom: 4px;
}

/* Submenu Items */
.submenu-item {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 8px 10px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-color);
    border-radius: 6px;
    transition: all 0.15s ease;
    text-align: left;
    white-space: nowrap;
    overflow: hidden;
}

.submenu-item span:not(.material-icons):not(.check-icon):not(.share-check) {
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
    min-width: 0;
}

.submenu-item:hover {
    background: var(--hover-bg, rgba(0,0,0,0.05));
}

.submenu-item .material-icons {
    font-size: 18px;
    color: var(--text-muted-color);
}

.submenu-item.selected {
    background: rgba(59, 130, 246, 0.1);
}

.submenu-item.selected .material-icons {
    color: var(--accent-color, #3B82F6);
}

.submenu-item .check-icon {
    margin-left: auto;
    font-size: 16px;
    color: var(--accent-color, #3B82F6);
}

/* Submenu Divider */
.submenu-divider {
    height: 1px;
    background: var(--border-color, #e5e7eb);
    margin: 4px 0;
}

/* Create New Item */
.submenu-item.create-new {
    color: var(--accent-color, #3B82F6);
}

.submenu-item.create-new .material-icons {
    color: var(--accent-color, #3B82F6);
}

/* Empty State */
.submenu-empty {
    padding: 12px;
    font-size: 12px;
    color: var(--text-muted-color);
    text-align: center;
}

/* Share Check Indicator */
.share-check {
    margin-left: auto;
    font-size: 16px;
    color: var(--accent-color, #3B82F6);
}

/* Submenu Content Scrollable */
.submenu-content {
    max-height: 180px;
    overflow-y: auto;
}

/* Dark Mode Submenu */
body.dark-mode .sheet-context-submenu {
    background: var(--gray-800, #1f2937);
    border-color: var(--gray-700, #374151);
    box-shadow: 0 4px 16px rgba(0,0,0,0.4);
}

body.dark-mode .submenu-header {
    border-color: var(--gray-700, #374151);
}

body.dark-mode .submenu-item:hover {
    background: var(--gray-700, #374151);
}

body.dark-mode .submenu-divider {
    background: var(--gray-700, #374151);
}

body.dark-mode .sheet-context-menu-item.has-submenu:hover {
    background: var(--gray-700, #374151);
}

/* ============================================
   Tag Filter Bar
   ============================================ */
.sheet-tag-filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 8px 0;
    border-top: 1px solid var(--border-color);
    margin-top: 8px;
}

.sheet-tag-filter-item {
    padding: 4px 10px;
    background: var(--hover-bg, rgba(0,0,0,0.03));
    color: var(--text-muted-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    font-size: 11px;
    cursor: pointer;
    transition: all var(--sheet-transition-fast);
}

.sheet-tag-filter-item:hover {
    border-color: var(--accent-color, #3B82F6);
    color: var(--accent-color, #3B82F6);
}

.sheet-tag-filter-item.active {
    background: var(--accent-color, #3B82F6);
    border-color: var(--accent-color, #3B82F6);
    color: white;
}

.sheet-tag-filter-clear {
    padding: 4px 10px;
    background: transparent;
    color: var(--text-muted-color);
    border: none;
    font-size: 11px;
    cursor: pointer;
    transition: color var(--sheet-transition-fast);
}

.sheet-tag-filter-clear:hover {
    opacity: 0.7;
}

/* Dark mode tag filter */
body.dark-mode .sheet-tag-filter-item {
    background: var(--gray-700);
    border-color: var(--gray-600);
}

body.dark-mode .sheet-tag-filter-item:hover {
    border-color: var(--accent-color, #3B82F6);
}

/* ============================================
   Tag Filter Bar (New)
   ============================================ */
.sheet-panel-tag-bar {
    display: none;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    padding: 8px 0;
    border-top: 1px solid var(--border-color);
    margin-top: 8px;
}

.sheet-tag-filter-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    background: var(--hover-bg, rgba(0,0,0,0.03));
    color: var(--text-muted-color);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    font-size: 11px;
    cursor: pointer;
    transition: all var(--sheet-transition-fast);
    white-space: nowrap;
}

.sheet-tag-filter-badge .material-icons {
    font-size: 14px;
}

.sheet-tag-filter-badge:hover {
    border-color: var(--accent-color, #3B82F6);
    color: var(--accent-color, #3B82F6);
}

.sheet-tag-filter-badge.active {
    background: var(--accent-color, #3B82F6);
    border-color: var(--accent-color, #3B82F6);
    color: white;
}

.sheet-tag-filter-clear {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    background: #EF4444;
    color: white;
    border: 1px solid #EF4444;
    border-radius: 16px;
    font-size: 11px;
    cursor: pointer;
    transition: all var(--sheet-transition-fast);
    white-space: nowrap;
}

.sheet-tag-filter-clear .material-icons {
    font-size: 14px;
}

.sheet-tag-filter-clear:hover {
    opacity: 0.7;
}

/* Dark mode tag filter bar */
body.dark-mode .sheet-tag-filter-badge {
    background: var(--gray-700);
    border-color: var(--gray-600);
}

body.dark-mode .sheet-tag-filter-badge:hover {
    border-color: var(--accent-color, #3B82F6);
}