html, body { overscroll-behavior-y: contain; }
body { font-family: 'Inter', sans-serif; background-color: #f3f4f6; }

/* ============================================================
   ヘッダー・レイアウト
   ============================================================ */

/* タブレット (769px - 1199px) */
@media (min-width: 769px) {
    .header {
        background: white;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    }
    .sections-wrapper { padding-bottom: 88px; }
    main { max-width: 900px; margin: 0 auto; }
    .task-row { height: 37px; }
    #desktop-sidebar { display: none; }
}

/* PC 2カラムレイアウト (1200px+) */
@media (min-width: 1200px) {
    #main-grid-container {
        display: grid;
        grid-template-columns: 160px minmax(0, 960px);
        gap: 1rem;
        justify-content: center;
        max-width: none;
        padding: 1rem 2rem;
    }
    main {
        max-width: 960px;
        margin: 0;
        grid-column: 2 / 3;
    }
    #desktop-sidebar {
        display: block;
        position: sticky;
        top: 24px;
        align-self: start;
        height: calc(100vh - 48px);
        overflow-y: auto;
        grid-column: 1 / 2;
    }
    #header-nav-mobile,
    #header-stats-container-mobile {
        display: none;
    }
    .header {
        box-shadow: none;
        border-bottom: 1px solid #e5e7eb;
    }
    .header > .container {
        max-width: none;
        padding: 0 2rem;
    }
}

/* モバイル (〜768px) */
@media (max-width: 768px) {
    .header {
        background: white;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
        text-align: center;
    }
    #desktop-sidebar { display: none; }
}

/* ============================================================
   タブ
   ============================================================ */

.tab-link.active {
    border-color: #3b82f6;
    background-color: #3b82f6;
    color: white;
}

@media (min-width: 1200px) {
    #desktop-sidebar .tab-link { border-bottom: none; }
    #desktop-sidebar .tab-link.active {
        border-color: #3b82f6;
        background: none;
        color: #2563eb;
        font-weight: 600;
        border-left-width: 4px;
        padding-left: 0.75rem;
    }
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ============================================================
   フォーカス・スクロールバー
   ============================================================ */

.task-row.focused,
.subtask-item.focused,
tr.repeat-task-row.focused { background-color: #fef9c3; }

.task-card.focused,
div.repeat-task-row.focused { background-color: #fef9c3; }

::-webkit-scrollbar { width: 8px; height: 0; }
::-webkit-scrollbar-track { background: #f1f1f1; border-radius: 10px; }
::-webkit-scrollbar-thumb { background: #888; border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: #555; }

/* ============================================================
   タスクテーブル
   ============================================================ */

.timer-btn {
    min-width: 24px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
}

.task-table th,
.task-table td {
    max-width: 320px;
    padding: 0.25rem 0.5rem;
    vertical-align: middle;
}

.task-table td.font-mono,
.task-table td .font-mono {
    position: relative;
    top: 1px;
}

/* ============================================================
   FAB (フローティングアクションボタン)
   ============================================================ */

.fab {
    height: 56px;
    width: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: all 0.2s ease-in-out;
}
.fab:hover {
    background-color: #ddd;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2);
}

#add-task-floating-container {
    display: none;
    position: fixed;
    z-index: 40;
}

@media (min-width: 769px) {
    #sync-button-floating-container {
        position: fixed;
        transform: none !important;
        top: auto;
        bottom: 24px;
        left: 24px;
    }
    #add-task-floating-container {
        display: block;
        bottom: 24px;
        right: 24px;
    }
}

/* ============================================================
   汎用ボタン・インプット
   ============================================================ */

.small-btn {
    min-height: 44px;
    min-width: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 6px 8px;
    border-radius: 6px;
    font-size: 0.9rem;
}
.inline-input,
.inline-select {
    width: 100%;
    box-sizing: border-box;
    padding: 6px 8px;
    border-radius: 6px;
    border: 1px solid #d1d5db;
}

/* ============================================================
   モーダル
   ============================================================ */

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
}
.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    border-radius: 8px;
    max-width: 90vw;
    max-height: 95vh;
    overflow-y: auto;
}

/* ============================================================
   ツールチップ
   ============================================================ */

.tooltip-container {
    position: relative;
    display: inline-block;
    vertical-align: middle;
}
.custom-tooltip {
    visibility: hidden;
    opacity: 0;
    background-color: #2d3748;
    color: #fff;
    text-align: left;
    border-radius: 6px;
    padding: 8px 12px;
    position: absolute;
    z-index: 10;
    bottom: 150%;
    left: 50%;
    transform: translateX(-50%);
    transition: opacity 0.1s, visibility 0.1s;
    width: max-content;
    max-width: 300px;
    font-size: 0.875rem;
    font-weight: normal;
    line-height: 1.4;
    white-space: pre-wrap;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    pointer-events: none;
}
.custom-tooltip::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border: 5px solid transparent;
    border-top-color: #2d3748;
}
.dragging .custom-tooltip { position: static; transform: none; }
.tooltip-container:hover .custom-tooltip          { visibility: visible; opacity: 1; transition-delay: 0.1s; }
.tooltip-container:hover .custom-tooltip.tooltip-top    { bottom: 150%; top: auto; }
.tooltip-container:hover .custom-tooltip.tooltip-bottom { top: 150%; bottom: auto; }
.custom-tooltip.tooltip-bottom::after {
    top: -10px;
    bottom: auto;
    border-color: transparent transparent #2d3748 transparent;
}

/* ============================================================
   ドラッグ＆ドロップ
   ============================================================ */

.dragging {
    opacity: 0.5;
    background-color: #fef9c3;
    transform: translate(0, 0);
}
.dragging .custom-tooltip,
.dragging .tooltip-container:hover .custom-tooltip {
    visibility: hidden !important;
    opacity: 0 !important;
    display: none !important;
}
.drag-over { background-color: #e0f2fe; }
.drag-handle { cursor: move; color: #9ca3af; }
.drag-handle:hover { color: #6b7280; }

/* 空セクションのドロップターゲット */
.empty-section-drop-target { display: none; }
.dragging-active .empty-section-drop-target { display: table-row; }

.empty-section-drop-target td {
    padding: 0;
    border-width: 0;
    line-height: 0;
}
.dragging-active .empty-section-drop-target td {
    padding: 0.5rem 1rem !important;
    line-height: 1rem;
}

@media (max-width: 768px) {
    .empty-section-drop-target { display: none; }
    .dragging-active .empty-section-drop-target {
        display: block;
        height: auto;
        padding: 1rem !important;
        margin-top: 0.5rem !important;
        margin-bottom: 0.5rem !important;
        border-width: 2px !important;
    }
}

/* ============================================================
   アーカイブ
   ============================================================ */

.archive-tabs { border-bottom: 1px solid #e5e7eb; }
.archive-tab { padding: 8px 16px; cursor: pointer; border-bottom: 2px solid transparent; }
.archive-tab.active { border-bottom-color: #3b82f6; color: #3b82f6; }
.time-input { width: 80px; text-align: center; border: 1px solid #d1d5db; border-radius: 4px; padding: 2px 4px; }
.archive-search-box { display: flex; gap: 8px; align-items: center; margin-bottom: 12px; }
.archive-search-input { flex: 1; padding: 8px 10px; max-width: 50%; border-radius: 6px; border: 1px solid #d1d5db; background: white; }
.archive-search-btn { padding: 8px 12px; border-radius: 6px; background: #3b82f6; color: white; border: none; cursor: pointer; }
.archive-clear-btn { padding: 8px 10px; border-radius: 6px; background: #e5e7eb; color: #374151; border: none; cursor: pointer; }
.search-result-meta { font-size: 0.85rem; color: #6b7280; }

@media (max-width: 768px) {
    .archive-table-wrapper {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    .archive-table-wrapper > table { min-width: 640px; }
    .archive-table-wrapper td,
    .archive-table-wrapper th { white-space: nowrap; }
    .archive-table-wrapper .task-memo-cell {
        white-space: normal;
        min-width: 250px;
    }
}

/* ============================================================
   タスクカード (モバイル)
   ============================================================ */

@media (max-width: 768px) {
    .tab-content.active { padding-bottom: 104px; }
    .task-card { border-radius: 0; }
    .task-card.completed { background-color: #e5e7eb; }
    .task-card.completed.focused { background-color: #fef9c3; }
}

/* ============================================================
   サブタスク
   ============================================================ */

.subtask-toggle-icon {
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 2px;
    font-size: 0.75rem;
    color: #9ca3af;
    padding: 0 4px 2px;
}
.subtask-toggle-icon:hover { color: #4b5563; }

.subtask-container {
    display: none;
    padding-left: 3.5rem;
    background-color: #f9fafb;
}
.subtask-container.open { display: block; }

.task-row.dragging + .subtask-container-row { display: none; }
.subtask-container-row td { padding: 0; }

.subtask-item {
    display: flex;
    align-items: center;
    padding: 0.3rem 0.5rem;
    border-bottom: 1px solid #f3f4f6;
}
.subtask-item:last-child { border-bottom: none; }
.subtask-item.completed span { text-decoration: line-through; color: #9ca3af; }
.subtask-item .drag-handle { margin-right: 0.5rem; }

@media (max-width: 768px) {
    .subtask-container {
        padding-left: 0;
        margin-left: 0.75rem;
        margin-top: 2px;
        box-shadow: 0 3px 4px #ccc;
    }
}

/* モーダル内サブタスク */
#edit-task-subtasks,
#edit-repeat-subtasks { max-height: 200px; overflow-y: auto; }

.subtask-edit-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem;
    background-color: #f9fafb;
    border-radius: 6px;
}

/* ============================================================
   スワイプ (モバイル)
   ============================================================ */

@media (max-width: 768px) {
    .task-card-swipe-wrapper {
        position: relative;
        overflow: hidden;
        margin-top: 0.5rem;
        box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    }
    .task-card {
        margin-top: 0 !important;
        position: relative;
        z-index: 10;
        transition: transform 0.2s ease-out;
        touch-action: pan-y;
    }
    .task-card.swiping { transition: none; }

    .task-card-swipe-background {
        position: absolute;
        inset: 0;
        display: flex;
        justify-content: stretch;
        align-items: center;
        z-index: 1;
        color: white;
        font-weight: bold;
        overflow: hidden;
    }

    .swipe-bg {
        position: absolute;
        top: 0;
        bottom: 0;
        width: 100%;
        display: flex;
        align-items: center;
        transition: background-color 0.1s;
    }
    .swipe-bg-right {
        left: 0;
        background-color: #22c55e;
        justify-content: flex-start;
        display: none;
    }
    .swipe-bg-left {
        right: 0;
        background-color: #f59e0b;
        justify-content: flex-end;
        display: none;
    }

    .swipe-action-icon { display: none; padding: 0 20px; }
    .swipe-action-icon.visible { display: flex; }
    .swipe-action-icon svg { width: 24px; height: 24px; }
}

/* ============================================================
   同期ボタン・ボトムUI
   ============================================================ */

@media (max-width: 768px) {
    #sync-button-floating-container { display: none !important; }
}

#bottom-ui-container {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 104px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 16px;
    box-sizing: border-box;
    z-index: 50;
    will-change: transform;
    transition: transform 80ms linear, opacity 0.25s ease-in-out;
    background: transparent;
    pointer-events: none;
}

#bottom-nav-bar {
    display: flex;
    position: static;
    height: 56px;
    align-items: center;
    justify-content: flex-start;
    padding: 0 8px;
    gap: 8px;
    border-radius: 9999px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.12);
    background-color: rgba(249, 249, 249, 0.85);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border: 0.5px solid rgba(0, 0, 0, 0.1);
    will-change: auto;
    transition: none;
    pointer-events: auto;
}

.bottom-nav-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-basis: auto;
    flex-grow: 0;
    width: 56px;
    height: 56px;
    padding: 0;
    color: #333;
    background: none;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}
.bottom-nav-btn svg { width: 28px; height: 28px; }
.bottom-nav-btn .text-xs { display: none; }
.bottom-nav-btn.active { color: #007aff; }

@media (prefers-color-scheme: dark) {
    .bottom-nav-btn { color: #eee; }
}

#bottom-fab-add-task {
    display: block;
    position: static;
    z-index: auto;
    will-change: auto;
    transition: none;
    pointer-events: auto;
}

#add-task-btn-floating-mobile {
    height: 56px;
    width: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 5px 10px rgba(0, 0, 0, 0.12);
    transition: all 0.2s ease-in-out;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
    touch-action: none;
}
#add-task-btn-floating-mobile:hover  { box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2); }
#add-task-btn-floating-mobile:active { transform: scale(0.95); }

@media (max-width: 768px) {
    #bottom-ui-container { display: flex; }
}
@media (min-width: 769px) {
    #bottom-ui-container { display: none !important; }
}

/* ============================================================
   実行中タスク・タイマー・プログレスバー
   ============================================================ */

.task-card.running-enhanced { background-color: #eff6ff; }
.task-card.running-enhanced.focused { background-color: #fef9c3 !important; }

.running-timer {
    color: #1d4ed8;
    border-radius: 4px;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 64px;
    margin-left: 12px;
}

.running-progress-bg {
    position: absolute;
    bottom: 0;
    left: 0;
    height: 2px;
    background: linear-gradient(to right, #3b82f6, #60a5fa);
    transition: width 1s linear;
    opacity: 0.8;
    z-index: 10;
    pointer-events: none;
}

/* ============================================================
   クイックアクション（長押しメニュー）
   ============================================================ */

#quick-action-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 2000;
    touch-action: none;
}

#quick-action-menu {
    position: absolute;
    bottom: 90px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: flex-end;
    pointer-events: none;
}

.quick-action-item {
    background: white;
    border-left: 4px solid #ccc;
    padding: 8px 16px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.15);
    font-weight: 600;
    color: #374151;
    transform: translateX(20px);
    opacity: 0;
    transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    pointer-events: auto;
}

#quick-action-overlay.active .quick-action-item {
    transform: translateX(0);
    opacity: 1;
}

.quick-action-item.hovered {
    background-color: #3b82f6;
    color: white;
    transform: scale(1.1) translateX(-10px);
    box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
}

/* ============================================================
   ユーティリティ
   ============================================================ */

@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
.animate-spin { animation: spin 1s linear infinite; }