:root {
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --accent-color: #3b82f6;
    --accent-glow: rgba(59, 130, 246, 0.1);
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --transition-speed: 0.2s;

    /* Tag Colors - Border and BG */
    --slate-border: #94a3b8;
    --slate-bg: #f8fafc;
    --blue-border: #3b82f6;
    --blue-bg: #eff6ff;
    --green-border: #10b981;
    --green-bg: #f0fdf4;
    --yellow-border: #f59e0b;
    --yellow-bg: #fffbeb;
    --rose-border: #f43f5e;
    --rose-bg: #fff1f2;

    /* Selection Colors (Darker/Vibrant versions of borders) */
    --slate-selection: #475569;
    --blue-selection: #1d4ed8;
    --green-selection: #059669;
    --yellow-selection: #d97706;
    --rose-selection: #e11d48;
    --orange-border: #f97316;
    --orange-bg: #fff7ed;
    --orange-selection: #ea580c;
    --purple-border: #a855f7;
    --purple-bg: #faf5ff;
    --purple-selection: #9333ea;
    --cyan-border: #06b6d4;
    --cyan-bg: #ecfeff;
    --cyan-selection: #0891b2;
}

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

body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    overflow: hidden;
    overscroll-behavior-x: none;
}

.connector-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 900;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

header {
    height: 64px;
    background: #ffffff;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 1000;
}

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

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
}

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

nav {
    display: flex;
    gap: 8px;
}

.btn-toggle,
.btn-primary {
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-toggle {
    background: #f1f5f9;
    color: var(--text-secondary);
}

.btn-primary {
    background: var(--accent-color);
    color: white;
}

main {
    flex: 1;
    position: relative;
    overflow: hidden;
}

.view {
    position: absolute;
    inset: 0;
    opacity: 0;
    visibility: hidden;
}

.view.active {
    opacity: 1;
    visibility: visible;
}

.canvas-container {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--bg-color);
    position: relative;
    cursor: grab;
}

.canvas {
    width: 10000px;
    height: 10000px;
    position: absolute;
    transform-origin: 0 0;
}

.connector-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 900;
    width: 100%;
    height: 100%;
}

.relation-group {
    pointer-events: auto;
}

.connector-line {
    fill: none;
    stroke: var(--accent-color);
    stroke-width: 2.5;
    opacity: 0.7;
    vector-effect: non-scaling-stroke;
}

.connector-line.style-dashed {
    stroke-dasharray: 10 7;
}

.connector-line.style-dotted {
    stroke-dasharray: 2 5;
}

.connector-label {
    position: absolute;
    transform: translate(-50%, -50%);
    background: #ffffff;
    border: 1px solid var(--border-color);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.75rem;
    z-index: 50;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.line-style-picker {
    position: absolute;
    bottom: -36px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 4px;
    background: white;
    padding: 4px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    opacity: 0;
    pointer-events: none;
}

.connector-label:hover .line-style-picker {
    opacity: 1;
    pointer-events: auto;
}

.style-dot {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.group-card {
    position: absolute;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 48px 24px 24px 24px;
    pointer-events: auto;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}


.group-header {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 40px;
    background: rgba(0, 0, 0, 0.03);
    padding: 0 16px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 12px 12px 0 0;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
    z-index: 5;
}

.group-header input {
    background: transparent;
    border: none;
    color: inherit;
    font-size: inherit;
    font-weight: 600;
}

.group-header {
    display: flex;
    align-items: center;
    gap: 4px;
    white-space: nowrap;
}

.modal button {
    padding: 8px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.95rem;
    pointer-events: auto !important;
    /* モーダルボタンは必ずクリック可能に */
    z-index: 10001;
    /* モーダルより前面に */
}

.modal button:hover {
    background: var(--hover-color);
    pointer-events: auto !important;
    /* ホバー時も確実にクリック可能に */
}

.note-card {
    position: absolute;
    width: 300px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 52px 16px 16px 16px;
    /* Top padding for header */
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 10px 20px -5px rgba(0, 0, 0, 0.1);
    cursor: grab;
    transition: box-shadow var(--transition-speed);
}

.note-card:hover {
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

.note-card.selected,
.group-card.selected {
    border-color: var(--selection-color, #fbbf24) !important;
    border-width: 3.5px !important;
    box-shadow: 0 0 0 4px var(--selection-glow, rgba(251, 191, 36, 0.15)), 0 10px 20px rgba(0, 0, 0, 0.1);
}

.header-row {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 40px;
    background: rgba(0, 0, 0, 0.03);
    padding: 0 16px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 12px 12px 0 0;
    display: flex;
    align-items: center;
    gap: 8px;
    z-index: 10;
}

.item-actions {
    position: absolute;
    top: 6px;
    /* Inside the 40px header */
    right: 8px;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.2s;
    z-index: 100;
}

.note-card:hover .item-actions,
.group-card:hover .item-actions {
    opacity: 1;
}

.action-btn {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.2s;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.action-btn:hover {
    background: #f1f5f9;
    color: var(--accent-color);
}

.action-btn i {
    width: 14px;
    height: 14px;
}

.action-btn.pending {
    background: #10b981 !important;
    color: white !important;
    border-color: #10b981 !important;
}

.btn-delete:hover:not(.pending) {
    background: var(--color-rose);
    color: white;
    border-color: var(--color-rose);
}

.ghost {
    opacity: 0.3 !important;
}

.color-slate {
    border-color: var(--slate-border) !important;
    background-color: var(--slate-bg) !important;
    --selection-color: var(--slate-selection);
    --selection-glow: rgba(71, 85, 105, 0.15);
}

.color-blue {
    border-color: var(--blue-border) !important;
    background-color: var(--blue-bg) !important;
    --selection-color: var(--blue-selection);
    --selection-glow: rgba(29, 78, 216, 0.15);
}

.color-green {
    border-color: var(--green-border) !important;
    background-color: var(--green-bg) !important;
    --selection-color: var(--green-selection);
    --selection-glow: rgba(5, 150, 105, 0.15);
}

.color-yellow {
    border-color: var(--yellow-border) !important;
    background-color: var(--yellow-bg) !important;
    --selection-color: var(--yellow-selection);
    --selection-glow: rgba(217, 119, 6, 0.15);
}

.color-rose {
    border-color: var(--rose-border) !important;
    background-color: var(--rose-bg) !important;
    --selection-color: var(--rose-selection);
    --selection-glow: rgba(225, 29, 72, 0.15);
}

.color-orange {
    border-color: var(--orange-border) !important;
    background-color: var(--orange-bg) !important;
    --selection-color: var(--orange-selection);
    --selection-glow: rgba(234, 88, 12, 0.15);
}

.color-purple {
    border-color: var(--purple-border) !important;
    background-color: var(--purple-bg) !important;
    --selection-color: var(--purple-selection);
    --selection-glow: rgba(147, 51, 234, 0.15);
}

.color-cyan {
    border-color: var(--cyan-border) !important;
    background-color: var(--cyan-bg) !important;
    --selection-color: var(--cyan-selection);
    --selection-glow: rgba(6, 182, 212, 0.15);
}

.canvas-controls {
    position: absolute;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 1000;
}

.canvas-controls button {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    border: none;
    background: white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.canvas-controls button:hover:not(:disabled) {
    background: #f8fafc;
    transform: translateY(-2px);
}

.canvas-controls button:active:not(:disabled) {
    transform: translateY(0);
}

.canvas-controls button:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.ctrl-sep {
    height: 1px;
    background: var(--border-color);
    margin: 4px 8px;
}

.quick-action-container {
    position: absolute;
    transform: translate(-50%, -100%);
    background: white;
    border: 1px solid var(--border-color);
    padding: 8px;
    border-radius: 12px;
    display: flex;
    gap: 8px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.note-card .header-row,
.group-card .group-header {
    margin: 0;
    padding: 8px 12px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    background: rgba(0, 0, 0, 0.02);
    display: flex;
    align-items: center;
    gap: 8px;
    border-radius: 12px 12px 0 0;
}

.title-input,
.group-header input {
    flex: 1;
    border: none;
    background: transparent;
    font-weight: 700;
    font-size: 1rem;
    color: var(--text-primary);
    width: 100%;
}

.title-input:focus {
    outline: none;
}

.quick-btn {
    background: var(--accent-color);
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.75rem;
    /* Slightly larger */
    font-family: inherit;
    /* Use main font */
    font-weight: 500;
    white-space: nowrap;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: transform 0.1s, opacity 0.2s;
}

.quick-btn:hover {
    transform: translateY(-1px);
    opacity: 0.9;
}

.btn-connect {
    display: none;
}

.note-card.collapsed .header-row,
.group-card.collapsed .group-header {
    position: absolute;
    inset: 0;
    margin: 0;
    width: 100%;
    height: 100%;
    justify-content: center;
    background: inherit;
    z-index: 10;
    display: flex;
    align-items: center;
    border: none;
}

/* 覆い隠し（マスク）の定義: サイズは維持し中身を消す */
.note-card.collapsed,
.group-card.collapsed {
    overflow: hidden !important;
}

.note-card.collapsed .title-display,
.group-card.collapsed .title-display {
    text-align: center;
    width: 100%;
    height: 100%;
    background: transparent;
    pointer-events: none;
    font-size: 1.5rem;
    /* カードサイズに応じて大きく */
    font-weight: 700;
    white-space: normal;
    /* 複数行を許可 */
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.4;
    word-break: break-word;
    /* 長い単語も折り返し */
    padding: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
}

.note-card.collapsed .content,
.note-card.collapsed .meta,
.note-card.collapsed .item-actions,
.group-card.collapsed .item-actions {
    display: none !important;
}

.note-card.collapsed .btn-collapse {
    position: absolute;
    left: 8px;
    top: 8px;
    z-index: 20;
    pointer-events: auto !important;
    /* 折りたたみボタンは必ずクリック可能に */
}

.group-card.collapsed .btn-collapse {
    position: absolute;
    left: 8px;
    top: 8px;
    z-index: 20;
    pointer-events: auto !important;
    /* 折りたたみボタンは必ずクリック可能に */
}

.btn-collapse {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: none;
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
}

.btn-collapse:hover {
    background: rgba(0, 0, 0, 0.05);
}

.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    pointer-events: none;
    /* オーバーレイは無効化、コンテンツで有効化 */
}

.modal.active {
    display: flex;
    pointer-events: auto;
    /* アクティブ時はクリックを受け付ける */
}

.meta {
    position: absolute;
    bottom: 8px;
    left: 12px;
    pointer-events: none;
}

.meta span {
    font-size: 0.65rem;
    color: var(--text-secondary);
    opacity: 0.4;
    font-family: monospace;
}

/* 関係線のグループホバー */
.relation-group:hover line:not([stroke="transparent"]) {
    stroke: var(--accent-color);
    stroke-width: 3;
}

.relation-label-container {
    position: absolute;
    pointer-events: auto;
    background: white;
    padding: 2px 8px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 6px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transform: translate(-50%, -50%);
    z-index: 950;
    transition: all 0.2s;
}

.relation-label-container:hover {
    border-color: var(--accent-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.relation-label-input {
    border: none;
    background: transparent;
    font-size: 0.75rem;
    color: var(--text-primary);
    width: 60px;
    outline: none;
    text-align: center;
}

.relation-label-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.5;
}

.btn-rel-delete {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: none;
    background: #fee2e2;
    color: #ef4444;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-rel-delete:hover {
    background: #ef4444;
    color: white;
}

.btn-rel-delete i {
    width: 12px;
    height: 12px;
}

/* .modal.activeは上の.modalセクションに統合済み */

.modal-content {
    background: white;
    padding: 32px;
    border-radius: 16px;
    width: 500px;
    max-height: 90vh;
    /* 画面からはみ出さないように */
    display: flex;
    flex-direction: column;
    gap: 16px;
    z-index: 10010 !important;
    pointer-events: auto !important;
    position: relative;
    overflow: hidden;
    /* 内部スクロールのため */
}

/* スクロール可能なボディ領域を作るための汎用クラス */
.modal-body {
    flex: 1;
    overflow-y: auto;
    min-height: 0;
    /* Flexboxの子要素でスクロールさせるためのハック */
}

.modal-content * {
    pointer-events: auto !important;
}

.modal-content textarea {
    flex: 1;
    /* 余った領域を埋める */
    min-height: 200px;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    outline: none;
    font-family: inherit;
    line-height: 1.6;
    resize: vertical;
}

#import-input {
    min-height: 300px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    z-index: 10011 !important;
    position: relative;
    padding-top: 16px;
    border-top: 1px solid transparent;
    /* 境界線が必要なら色を指定 */
    flex-shrink: 0;
    /* フッターは縮小させない */
}
}

.btn-primary {
    background: var(--accent-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    pointer-events: auto !important;
    z-index: 10012 !important;
    position: relative;
}

.project-item:hover {
    background-color: var(--hover-color);
}

.outliner-container {
    padding: 60px 40px;
    height: 100%;
    overflow-y: auto;
    background: #ffffff;
}

.outline-list {
    max-width: 720px;
    margin: 0 auto;
}

.outline-item {
    margin-bottom: 4px;
    position: relative;
    cursor: grab;
    user-select: none;
}

.outline-item.dragging {
    opacity: 0.4;
    cursor: grabbing;
}

.outline-item.drag-over::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-color);
    z-index: 10;
}

.outline-header {
    display: flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 6px;
    font-weight: 500;
    transition: background 0.2s;
}

.outline-header.is-group {
    background: #f1f5f9;
    color: var(--text-primary);
}

.outline-header.is-note {
    background: transparent;
    color: var(--text-secondary);
}

.outline-content-summary {
    margin-top: 6px;
    margin-left: 38px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    opacity: 0.8;
}

.outline-children {
    margin-top: 8px;
    margin-left: 24px;
    padding-left: 16px;
    border-left: 1px solid var(--border-color);
}

/* Quick Actions */
.quick-actions {
    position: absolute;
    display: flex;
    gap: 8px;
    z-index: 2000;
    transform: translate(-50%, -100%);
    pointer-events: auto;
    padding-bottom: 12px;
}

.quick-btn {
    background: var(--accent-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
    transition: transform 0.2s, box-shadow 0.2s;
    white-space: nowrap;
}

.quick-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(59, 130, 246, 0.4);
}

/* Group Colors */
/* Apply similar styles as note-card colors but to group border/bg */
/* Slate (Default) */
.group-card.color-slate {
    border-color: #cbd5e1;
    background: #fff;
}

.group-card.color-slate .group-header {
    background: rgba(0, 0, 0, 0.03);
}

/* Red */
.group-card.color-red {
    border-color: #fca5a5;
    background: #fef2f2;
}

.group-card.color-red .group-header {
    background: rgba(254, 226, 226, 0.5);
}

/* Orange */
.group-card.color-orange {
    border-color: #fdba74;
    background: #fff7ed;
}

.group-card.color-orange .group-header {
    background: rgba(255, 237, 213, 0.5);
}

/* Amber */
.group-card.color-amber {
    border-color: #fcd34d;
    background: #fffbeb;
}

.group-card.color-amber .group-header {
    background: rgba(254, 243, 199, 0.5);
}

/* Green */
.group-card.color-green {
    border-color: #86efac;
    background: #f0fdf4;
}

.group-card.color-green .group-header {
    background: rgba(220, 252, 231, 0.5);
}

/* Emerald */
.group-card.color-emerald {
    border-color: #6ee7b7;
    background: #ecfdf5;
}

.group-card.color-emerald .group-header {
    background: rgba(209, 250, 229, 0.5);
}

/* Teal */
.group-card.color-teal {
    border-color: #5eead4;
    background: #f0fdfa;
}

.group-card.color-teal .group-header {
    background: rgba(204, 251, 241, 0.5);
}

/* Cyan */
.group-card.color-cyan {
    border-color: #67e8f9;
    background: #ecfeff;
}

.group-card.color-cyan .group-header {
    background: rgba(207, 250, 254, 0.5);
}

/* Sky */
.group-card.color-sky {
    border-color: #7dd3fc;
    background: #f0f9ff;
}

.group-card.color-sky .group-header {
    background: rgba(224, 242, 254, 0.5);
}

/* Blue */
.group-card.color-blue {
    border-color: #93c5fd;
    background: #eff6ff;
}

.group-card.color-blue .group-header {
    background: rgba(219, 234, 254, 0.5);
}

/* Indigo */
.group-card.color-indigo {
    border-color: #a5b4fc;
    background: #eef2ff;
}

.group-card.color-indigo .group-header {
    background: rgba(224, 231, 255, 0.5);
}

/* Violet */
.group-card.color-violet {
    border-color: #c4b5fd;
    background: #f5f3ff;
}

.group-card.color-violet .group-header {
    background: rgba(237, 233, 254, 0.5);
}

/* Purple */
.group-card.color-purple {
    border-color: #d8b4fe;
    background: #faf5ff;
}

.group-card.color-purple .group-header {
    background: rgba(243, 232, 255, 0.5);
}

/* Fuchsia */
.group-card.color-fuchsia {
    border-color: #f0abfc;
    background: #fdf4ff;
}

.group-card.color-fuchsia .group-header {
    background: rgba(250, 232, 255, 0.5);
}

/* Pink */
.group-card.color-pink {
    border-color: #f9a8d4;
    background: #fdf2f8;
}

.group-card.color-pink .group-header {
    background: rgba(252, 231, 243, 0.5);
}

/* Force interactions */
.canvas-container {
    pointer-events: auto !important;
    touch-action: none;
    /* Disable browser handling of gestures */
}

.modal:not(.active) {
    pointer-events: none !important;
    display: none !important;
    z-index: -1 !important;
}

/* Rose */
.group-card.color-rose {
    border-color: #fda4af;
    background: #fff1f2;
}

.group-card.color-rose .group-header {
    background: rgba(255, 228, 230, 0.5);
}