/* ==========================================================================
   1. 共通変数 & リセット
   ========================================================================== */
:root {
    /* レイアウト設定 */
    --layout-header-height: 60px;
    --layout-sidebar-width: 240px;
    --card-max-width: 500px; /* 共通のカード幅変数を作成 */

    /* ライトモードカラーパレット */
    --bg-main: #f5f5f7;
    --bg-header: #1a1a1a;
    --bg-sidebar: #eaeaea;
    --bg-card: #ffffff;
    --bg-hover: rgba(0, 0, 0, 0.05);
    --text-primary: #333333;
    --text-inverse: #ffffff;
    --text-muted: #666666;
    --accent-color: #9002d1;
    --border-color: #dddddd;
    --btn-bg-primary: #9002d1;
    --btn-text-primary: #ffffff;
    --btn-bg-secondary: #e0e0e0;
    --btn-text-secondary: #333333;
    --radius: 8px;
    --transition: all 0.3s ease;
}

/* ダークモードカラーパレット */
[data-theme='dark'] {
    --bg-main: #121212;
    --bg-header: #000000;
    --bg-sidebar: #1e1e1e;
    --bg-card: #2c2c2c;
    --bg-hover: rgba(255, 255, 255, 0.05);
    --text-primary: #e0e0e0;
    --text-inverse: #ffffff;
    --text-muted: #a0a0a0;
    --border-color: #444444;
    --btn-bg-primary: #bb86fc;
    --btn-text-primary: #000000;
    --btn-bg-secondary: #444444;
    --btn-text-secondary: #ffffff;
}

/* システム設定がダークモードの場合 */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme='light']) {
        --bg-main: #121212;
        --bg-header: #000000;
        --bg-sidebar: #1e1e1e;
        --bg-card: #2c2c2c;
        --bg-hover: rgba(255, 255, 255, 0.05);
        --text-primary: #e0e0e0;
        --text-inverse: #ffffff;
        --text-muted: #a0a0a0;
        --border-color: #444444;
        --btn-bg-primary: #bb86fc;
        --btn-text-primary: #000000;
        --btn-bg-secondary: #444444;
        --btn-text-secondary: #ffffff;
    }
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    overflow: hidden;
}
/* ==========================================================================
   2. レイアウト構造
   ========================================================================== */
#app-container {
    display: flex;
    flex-direction: column;
    height: 100dvh;
    min-height: 0;
}

#header-viewport {
    height: var(--layout-header-height);
    background-color: var(--bg-header);
    color: var(--text-inverse);
    z-index: 100;
}

#main-layout {
    display: flex;
    flex: 1;
    height: calc(100dvh - var(--layout-header-height));
    min-height: 0;
    position: relative;
}

#sidebar-viewport {
    width: var(--layout-sidebar-width);
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}
#content-viewport {
    flex: 1;
    height: calc(100dvh - var(--layout-header-height));
    min-height: 0;
    /* 要件指定: 90vhのダッシュボードレイアウト */
    overflow-y: auto;
    padding: 24px;
    background-color: var(--bg-main);
}

/* ==========================================================================
   3. 共通パーツ & UIコンポーネント
   ========================================================================== */
.header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    padding: 0 20px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header-auth {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.header-running-task {
    min-width: 0;
    margin-left: auto;
    margin-right: 12px;
}

.header-running-task-link {
    display: flex;
    align-items: center;
    gap: 8px;
    max-width: 360px;
    padding: 5px 12px;
    background: #333;
    border-radius: 20px;
    color: white;
    text-decoration: none;
}

.header-running-task-title {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.header-running-task-timer {
    flex: 0 0 42px;
    font-variant-numeric: tabular-nums;
    text-align: right;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.1);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.status-online { background-color: #4caf50; }
.status-offline { background-color: #f44336; }

.logo {
    font-size: 20px;
    font-weight: bold;
    letter-spacing: 1px;
}

.auth-login-button {
    padding: 8px 14px;
    font-size: 14px;
    background-color: var(--accent-color);
    color: var(--text-inverse);
}

.auth-login-button:hover {
    background-color: #7a00b6;
}

.auth-user {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 10px;
    border-radius: 999px;
    background-color: rgba(255, 255, 255, 0.12);
}

.auth-user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.auth-user-avatar-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.2);
    font-size: 16px;
}

.auth-user-meta {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.auth-user-name {
    font-size: 14px;
    font-weight: 600;
}

.auth-user-email {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.8);
}

.sidebar-menu {
    display: flex;
    flex-direction: column;
    padding: 20px 0;
        gap: 8px;
    }

.menu-item {
    display: flex;
    align-items: center;
    padding: 12px 24px;
    color: var(--text-primary);
    text-decoration: none;
    cursor: pointer;
    font-weight: 500;
    transition: var(--transition);
}

.menu-item:hover,
.menu-item.active {
    background-color: var(--bg-hover);
    color: var(--accent-color);
}

.sidebar-account-card {
    margin: auto 16px 16px;
    padding: 12px;
    border-radius: 12px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
}

.sidebar-account-button {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 10px;
    border: none;
    background: transparent;
    cursor: pointer;
    text-align: left;
    padding: 0;
}

.sidebar-user-avatar,
.sidebar-logout-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
}

.sidebar-user-avatar-placeholder,
.sidebar-logout-avatar-placeholder {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-color);
    color: white;
    font-weight: 700;
}

.sidebar-user-name,
.sidebar-logout-user-name {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
}

.sidebar-user-email,
.sidebar-logout-user-email {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 2px;
}

.sidebar-user-popup {
    position: fixed;
    z-index: 1200;
    min-width: 160px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.16);
    padding: 8px;
}

.sidebar-popup-action {
    width: 100%;
    border: none;
    background: transparent;
    padding: 10px 8px;
    text-align: left;
    cursor: pointer;
    border-radius: 6px;
}

.sidebar-popup-action:hover {
    background: #f5f5f5;
}

.sidebar-logout-modal {
    position: fixed;
    inset: 0;
    z-index: 1300;
    background: rgba(0, 0, 0, 0.35);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-logout-card {
    width: min(92vw, 360px);
    background: white;
    border-radius: 16px;
    padding: 24px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    text-align: center;
}

.sidebar-logout-card h3 {
    margin-bottom: 16px;
    font-size: 20px;
    text-align: center;
}

.sidebar-logout-user-card {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 12px 0 20px;
}

.sidebar-logout-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: stretch;
}

.sidebar-logout-actions .btn-primary {
    background: #111111;
    color: white;
}

.sidebar-logout-actions .btn-secondary {
    background: white;
    color: #111111;
    border: 1px solid #111111;
}

/* カード型UI */
.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    margin-bottom: 20px;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.card-title {
    color: var(--text-primary);
    font-size: 18px;
    margin-bottom: 16px;
    font-weight: 600;
}

/* 共通カードレイアウト */
.card-responsive {
    max-width: var(--card-max-width);
    width: 92%; /* スマホで横幅をカバー */
    margin: 20px auto;
}

/* フォーム要素 */
.input-group {
    margin-bottom: 16px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    }

.input-control {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 16px;
    background-color: var(--bg-card);
    color: var(--text-primary);
}

/* ボタン */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary {
    background-color: var(--btn-bg-primary);
    color: var(--btn-text-primary);
}

.btn-primary:hover {
    filter: brightness(1.1);
}

.btn-secondary {
    background-color: var(--btn-bg-secondary);
    color: var(--btn-text-secondary);
}

.btn-secondary:hover {
    filter: brightness(0.9);
}

/* ステータスメッセージ */
.status-message {
    padding: 12px;
    margin-bottom: 16px;
    border-radius: var(--radius);
    text-align: center;
    font-weight: 600;
    transition: var(--transition);
}

.status-message.success {
    background-color: #e8f5e9;
    color: #2e7d32;
    border: 1px solid #c8e6c9;
}

[data-theme='dark'] .status-message.success {
    background-color: #1b3a1d;
    color: #81c784;
    border-color: #2e7d32;
}

.status-message.error {
    background-color: #ffebee;
    color: #c62828;
    border: 1px solid #ffcdd2;
}

[data-theme='dark'] .status-message.error {
    background-color: #4a1d1d;
    color: #e57373;
    border-color: #c62828;
}

/* テーブル & リスト表示 */
.data-table {
    width: 100%;
    min-width: 620px;
    border-collapse: collapse;
}

.data-table th,
.data-table td {
    padding: 14px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background-color: var(--bg-sidebar);
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
}

.clickable-row {
    cursor: pointer;
    transition: var(--transition);
}

.clickable-row:hover {
    background-color: var(--bg-hover);
}

/* プログレスバー */
.progress-container {
    width: 100%;
    background-color: #e0e0e0;
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar {
    height: 8px;
    background-color: #4caf50;
    width: 0%;
    transition: width 0.3s ease;
}

.progress-bar-complete {
    width: 33%;
}

.progress-bar-partial {
    width: 33%;
}

.progress-bar-empty {
    width: 0%;
}

/* タイマーデザイン */
.timer-display {
    font-size: 64px;
    font-weight: bold;
    text-align: center;
    font-family: monospace;
    margin: 30px 0;
    color: var(--text-primary);
}

/* ページ固有レイアウト */
.mainmenu-view,
.task-suggestion-view,
.task-complete-view {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 70vh;
}

.mainmenu-card,
.task-complete-card {
    max-width: 500px;
    width: 100%;
    text-align: center;
    padding: 40px 24px;
}

/* ==========================================================================
   提案画面 & 詳細画面のレイアウト改善
   ========================================================================== */

/* 提案画面のカード中央配置とタイポグラフィ */
.task-suggestion-card {
    max-width: var(--card-max-width);
    width: 92%;
    margin: 20px auto;
    padding: 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    border-radius: 16px;
}

.task-suggestion-badge {
    margin-bottom: 16px;
    font-size: 0.85rem;
    padding: 6px 16px;
    background: #e1f5fe;
    color: var(--accent-color);
    border-radius: 20px;
    font-weight: bold;
}

.task-suggestion-title {
    font-size: 1.5rem;
    margin: 16px 0;
    line-height: 1.3;
}

.task-suggestion-meta {
    width: 100%;
    padding: 20px; /* 余白を少し大きく */
    background: var(--bg-card);
    color: var(--text-primary);
    border-radius: 12px;
    font-size: 0.95rem;
    box-sizing: border-box; /* パディングを含めた幅計算 */
}

/* メタ情報内の行間を調整 */
.task-suggestion-meta > div {
    margin-bottom: 12px;
}

.task-suggestion-meta > div:last-child {
    margin-bottom: 0;
}

.task-complete-progress-card {
    background-color: var(--bg-main);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.suggestion-progress-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-top: 8px;
}

.mainmenu-title,
.task-suggestion-title,
.task-complete-title {
    font-size: 24px;
    margin-bottom: 8px;
}

.mainmenu-description,
.task-suggestion-description,
.task-complete-summary,
.login-description,
.task-detail-description,
.result-breakdown-description {
    color: var(--text-muted);
    margin-bottom: 24px;
}

.mainmenu-submit-btn,
.task-suggestion-start-btn,
.task-complete-primary-btn {
    width: 100%;
    padding: 14px;
}

.mainmenu-history {
    max-width: 600px;
    margin: 24px auto 0;
    width: 100%;
}

.mainmenu-history-title {
    font-size: 16px;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.mainmenu-history-card {
    padding: 16px;
}

.mainmenu-history-text {
    font-size: 14px;
}

.setting-card,
.login-card,
.howto-card,
.result-breakdown-card {
    max-width: 600px;
    margin: 0 auto;
}

.login-card {
    max-width: 500px;
    text-align: center;
}

.google-login-button {
    display: flex;
    justify-content: center;
    margin: 24px 0;
}

.login-cancel-btn {
    width: 100%;
}

.howto-card {
    max-width: 700px;
}

.howto-content {
    line-height: 1.6;
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.howto-actions {
    margin-top: 30px;
    text-align: center;
}

/* 提案画面のボタン配置改善 */
.task-suggestion-actions {
    display: flex;
    flex-direction: column;
    gap: 16px;
    width: 100%;
}

.task-suggestion-action-row {
    display: flex;
    justify-content: center;
    gap: 16px;
    width: 100%;
}

.task-complete-actions {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.task-suggestion-secondary-btn,
.task-complete-secondary-btn,
.result-breakdown-retry-btn {
    flex: 1;
}

.task-suggestion-secondary-btn {
    white-space: nowrap;
    padding: 10px 20px;
    flex: 0 1 auto;
    min-width: 100px;
}

.task-complete-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.task-complete-progress-row {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    margin-bottom: 8px;
}

.task-action-view {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 70vh;
}

.task-action-card {
    max-width: 500px;
    width: 100%;
    text-align: center;
    padding: 40px 24px;
}

.task-action-caption {
    color: var(--text-muted);
    font-size: 14px;
}

.task-action-title {
    font-size: 24px;
    margin-top: 8px;
}

.task-action-buttons {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.task-action-complete-btn {
    background-color: #4caf50;
    padding: 16px;
}

.task-progress-cell {
    display: flex;
    align-items: center;
    gap: 8px;
}

.task-progress-container {
    width: 80px;
}

.task-status {
    font-weight: 600;
}

.task-status-progress {
    color: #ff9800;
}

.task-status-pending {
    color: var(--text-muted);
}

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

.task-list-title {
    margin: 0;
}

.task-list-create-btn {
    padding: 8px 16px;
    font-size: 14px;
}

.task-detail-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.task-list-card {
    padding: 0;
    overflow-x: auto;
}

.task-sort-btn {
    appearance: none;
    border: 0;
    background: transparent;
    color: var(--text-primary);
    cursor: pointer;
    font: inherit;
    font-weight: 600;
    padding: 4px 0;
    white-space: nowrap;
}

.task-sort-btn:hover,
.task-sort-btn:focus-visible,
.task-sort-btn.is-active {
    color: var(--accent-color);
}

.task-sort-btn.is-active::after {
    content: "";
    display: inline-block;
    width: 0;
    height: 0;
    margin-left: 6px;
    vertical-align: 2px;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-bottom: 5px solid currentColor;
}

.task-sort-btn.is-active[data-direction="desc"]::after {
    transform: rotate(180deg);
}

.task-detail-back-row {
    margin-bottom: 16px;
}

.task-detail-back-btn {
    padding: 6px 12px;
    font-size: 14px;
}

/* 詳細画面 */
.task-metadata {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 24px;
    padding: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
}

.task-metadata-full {
    grid-column: span 2;
}

.subtasks-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 24px;
}

.task-detail-item {
    padding: 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--bg-card);
    color: var(--text-primary);
}

.task-detail-item-status {
    margin-left: auto;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.subtask-minutes-badge {
    background: var(--bg-sidebar);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.task-detail-item-complete {
    background: var(--bg-sidebar);
}

.task-detail-item-status-complete {
    color: #4caf50;
    font-weight: bold;
}

.task-detail-delete-btn {
    color: #d32f2f;
}

.result-breakdown-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.result-breakdown-title {
    margin-bottom: 0;
}

.result-breakdown-settings-btn {
    padding: 6px 12px;
    font-size: 14px;
}

.result-breakdown-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.add-step-btn {
    margin-bottom: 8px;
}

.result-breakdown-step-card {
    padding: 16px;
    background: var(--bg-card);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    margin: 0;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.drag-handle {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: grab;
    font-size: 18px;
    color: var(--text-muted);
    user-select: none;
}

.result-breakdown-step-card.dragging { opacity: 0.5; }
.result-breakdown-step-card.drag-over { outline: 2px dashed var(--primary-color); }

/* frontend/css/style.css への追加・修正 */

.result-breakdown-meta-area {
    display: flex;
    gap: 20px;
    margin: 16px 0;
    padding: 12px;
    background: var(--bg-sidebar);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.result-breakdown-meta-area label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
}

.result-breakdown-meta-area select,
.result-breakdown-meta-area input {
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--bg-card);
    color: var(--text-primary);
}

/* メインタイトルエリアの調整 */
.result-breakdown-title-area {
    width: 100%;
}

.editable-step-title {
    display: inline-block;
    min-width: 120px;
    padding: 2px 6px;
    border-radius: 4px;
}
.editable-step-title[contenteditable="true"]:focus {
    outline: 2px solid rgba(0,120,212,0.2);
    background: #fff;
}

.editable-step-desc {
    width: 100%;
    min-height: 48px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 8px;
    resize: vertical;
    background: var(--bg-card);
    color: var(--text-primary);
}

.parent-task-title-input {
    font-size: 20px;
    font-weight: 600;
    padding: 8px 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    width: 100%;
    box-sizing: border-box;
    background: var(--bg-card);
    color: var(--text-primary);
}
.parent-task-detail-input {
    width: 100%;
    min-height: 56px;
    margin-top: 8px;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-card);
    color: var(--text-primary);
}

.result-breakdown-step-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.result-breakdown-step-head {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.result-breakdown-step-time {
    color: var(--text-muted);
    font-size: 14px;
}

.result-breakdown-step-meta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
    font-size: 14px;
}

.result-breakdown-step-meta label {
    display: flex;
    flex-direction: column;
    gap: 4px;
    color: var(--text-muted);
}

.result-breakdown-step-meta input,
.result-breakdown-step-meta select {
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 6px 8px;
}

.result-breakdown-step-btn {
    padding: 4px 8px;
    font-size: 12px;
}

.result-breakdown-confirm-btn {
    flex: 2;
}

/* モバイルメニュー用トグルボタン */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
}

/* ==========================================================================
   4. レスポンシブ設計 (ブレイクポイント: 768px)
   ========================================================================== */
@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }

    #sidebar-viewport {
        position: absolute;
        left: -240px;
        top: 0;
        height: calc(100dvh - var(--layout-header-height));
        max-height: calc(100svh - var(--layout-header-height));
        overflow-y: auto;
        padding-bottom: env(safe-area-inset-bottom);
        z-index: 90;
        box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
    }

    #sidebar-viewport.open {
        left: 0;
    }

    #content-viewport {
        padding: 16px;
        height: calc(100dvh - var(--layout-header-height));
        min-height: 0;
        /* モバイルは全体スクロールを許容 */
    }

    .header-bar {
        padding: 0 10px;
        gap: 8px;
    }

    .header-left {
        flex-shrink: 0;
        gap: 8px;
    }

    .header-running-task {
        flex: 1 1 auto;
        margin: 0;
    }

    .header-running-task-link {
        max-width: none;
        padding: 5px 8px;
        gap: 5px;
        font-size: 12px;
    }

    .header-running-task-timer {
        flex-basis: 36px;
    }

    .header-auth {
        gap: 0;
    }

    .task-edit-form {
        padding: 12px;
    }

    .task-edit-form > div[style*="display: flex"] {
        display: grid !important;
        grid-template-columns: 1fr 1fr;
        gap: 8px !important;
    }

    .task-edit-form > div[style*="display: flex"] > div {
        min-width: 0;
    }

    .task-edit-form input,
    .task-edit-form textarea,
    .task-edit-form select {
        max-width: 100%;
    }

    .subtask-edit-row {
        display: grid !important;
        grid-template-columns: minmax(0, 1fr) 58px 40px;
        gap: 6px !important;
    }

    .subtask-edit-row .subtask-title {
        min-width: 0;
    }

    .subtask-edit-row .subtask-minutes {
        width: 58px !important;
    }

    .subtask-edit-row button {
        min-height: 36px;
        padding: 6px 8px;
    }

    .subtask-edit-row .move-up-btn {
        grid-column: 1;
    }

    .subtask-edit-row .move-down-btn,
    .subtask-edit-row .remove-subtask-btn {
        grid-column: 2;
    }

    .subtask-edit-row .remove-subtask-btn {
        grid-column: 3;
    }

    .status-indicator {
        padding: 4px 6px;
        font-size: 11px;
    }

    .task-list-header {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
    }

    .task-list-create-btn {
        width: 100%;
    }

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

    .task-detail-actions .btn {
        width: 100%;
    }

    .result-breakdown-step-card {
        flex-direction: row;
        gap: 8px;
        align-items: flex-start;
    }

    .drag-handle { display: flex; }

    .result-breakdown-step-meta {
        width: 100%;
        justify-content: space-between;
    }

    .parent-task-title-input { font-size: 18px; }
    .parent-task-detail-input { min-height: 64px; }
}

/* 編集モード専用のスタイル */
.task-edit-form {
    background: #fff;
    padding: 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
}

.subtask-edit-row {
    background: #f9f9f9;
    padding: 8px;
    border-radius: 4px;
    border: 1px solid #eee;
    align-items: center;
}

.subtask-edit-row input {
    padding: 6px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.subtask-edit-row button {
    padding: 4px 8px;
    cursor: pointer;
    background: #eee;
    border: 1px solid #ccc;
    border-radius: 4px;
}

.subtask-edit-row button:hover {
    background: #ddd;
}

/* タスク入力フォームの調整 */
.view-container-center {
    display: flex;
    justify-content: center;
    padding: 24px;
}

.task-input-container {
    width: 100%;
    max-width: var(--card-max-width);
}