/* --- PLINY REFRESHED: iOS Inspired UI/UX v2 --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --primary: #007aff;
    --primary-light: #e6f2ff;
    --danger: #ff3b30;
    --success: #34c759;
    --warning: #ff9500;
    
    --bg-app: #f2f2f7;
    --bg-pane: #ffffff;
    --bg-hover: #f1f1f1;

    --text-primary: #000000;
    --text-secondary: #8a8a8e;
    --text-placeholder: #c7c7cc;
    --text-on-primary: #ffffff;
    
    --border-color: rgba(60, 60, 67, 0.29);
    
    --radius-md: 10px;
    --radius-lg: 12px;

    --shadow-focus: 0 0 0 3px rgba(0, 122, 255, 0.2);

    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    
    --indent-width: 32px;
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
    height: 100%; margin: 0; padding: 0;
    background: var(--bg-app);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

#app-container { display: flex; height: 100vh; position: relative; }

#loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.8);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    gap: 10px;
    font-size: 1.2em;
    color: var(--text-secondary);
}

#loading-overlay .spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(0, 122, 255, 0.3);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

#left-pane {
    width: 380px;
    background: transparent;
    display: flex; flex-direction: column;
    gap: 30px; padding: 24px;
    overflow-y: auto; flex-shrink: 0;
}

header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 0 8px;
}
header h1 { font-size: 2.2em; font-weight: 700; margin: 0; letter-spacing: -0.02em; }
#global-actions { display: flex; gap: 12px; }
#global-actions button {
    width: 36px; height: 36px;
    background: transparent; color: var(--primary);
    border: none; border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    transition: var(--transition); cursor: pointer; padding: 0;
}
#global-actions button:hover:not(:disabled) { background: var(--primary-light); }
#global-actions button:disabled { color: var(--text-placeholder); cursor: not-allowed; }
#global-actions button svg { width: 22px; height: 22px; }

.control-group {
    background: var(--bg-pane);
    border-radius: var(--radius-lg);
    box-shadow: 0 1px 1px rgba(0,0,0,0.02);
}

#task-form { padding: 12px 16px; display: flex; flex-direction: column; }
#task-form input[type="text"] { border: none; padding: 10px 0; border-radius: 0; }
#task-form input[type="text"]:focus { box-shadow: none; }
.form-divider { height: 1px; background: var(--border-color); margin: 8px 0; }
#task-form button { margin-top: 12px; padding: 10px; }

#add-task-label-selector {
    padding: 8px 0;
}

#add-task-label-selector .label-checkbox-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 4px 8px;
    margin: 4px;
    border-radius: var(--radius-md);
    background-color: var(--bg-app);
    cursor: pointer;
}

#add-task-label-selector .label-checkbox-item input {
    display: none; /* Hide actual checkbox */
}

#add-task-label-selector .label-checkbox-item .label-color-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

#add-task-label-selector .label-checkbox-item.selected {
    background-color: var(--primary-light);
    color: var(--primary);
}

.accordion-toggle {
    background: transparent; color: var(--text-primary);
    padding: 16px; font-size: 1.05em; font-weight: 500;
    width: 100%; display: flex; justify-content: space-between; align-items: center;
    border-radius: var(--radius-lg);
}
.accordion-toggle:hover { background: var(--bg-hover); }
.accordion-content {
    padding: 16px; display: none; flex-direction: column;
    gap: 14px; border-top: 1px solid var(--border-color);
}
.accordion-toggle.active + .accordion-content { display: flex; }
.accordion-icon {
    border: solid var(--text-secondary); border-width: 0 2px 2px 0;
    display: inline-block; padding: 3px; transform: rotate(45deg); transition: transform 0.2s;
}
.accordion-toggle.active .accordion-icon { transform: rotate(-135deg); }
#gemini-prompt {
    min-height: 80px;
    resize: none;
}

#gemini-trigger-btn { padding: 10px; }

#right-pane {
    flex-grow: 1; padding: 24px;
    display: flex; flex-direction: column; gap: 16px; min-width: 0;
}
#right-pane-header { display: flex; justify-content: space-between; align-items: flex-end; padding: 0 8px; }
#view-title { font-size: 2.2em; font-weight: 700; margin: 0; letter-spacing: -0.02em; }
#view-switcher { padding: 4px; background-color: #dddde2; border-radius: 8px; display: flex; }
#view-switcher button {
    padding: 4px 12px; font-size: 0.85em; font-weight: 600;
    border-radius: 6px; background: transparent;
    color: var(--text-primary); border: none;
    transition: var(--transition);
}
#view-switcher button.active {
    background: var(--bg-pane); color: var(--text-primary);
    box-shadow: 0 1px 4px rgba(0,0,0,0.1);
}

#list-view { background: transparent; padding: 0; border: none; }
#task-list-container { background: var(--bg-pane); border-radius: var(--radius-lg); overflow: hidden; }
#calendar-view { 
    background: var(--bg-pane); 
    border-radius: var(--radius-lg); 
    padding: 16px; 
    display: none; 
    flex-direction: column; /* Use flexbox for layout */
    flex-grow: 1;
}

#calendar-container {
    flex-grow: 1; /* Allow container to grow */
    min-height: 0; /* Prevent overflow issues in flexbox */
}

/* iOS-style Task List v2 */
.task-node {
    position: relative;
    --level-indent: calc((var(--level, 1) - 1) * var(--indent-width));
}
.task-node::after {
    content: ''; position: absolute; bottom: 0;
    left: calc(var(--level-indent) + 50px);
    right: 0; height: 1px; background: var(--border-color);
}
.task-node:last-child::after { display: none; }
.task-card {
    display: flex; align-items: center; gap: 8px;
    background: transparent; padding: 12px 16px;
    transition: background-color 0.2s;
}
.task-card:hover { background: var(--bg-hover); }
.task-card.completed { opacity: 0.5; }
.task-card.completed .task-text { text-decoration: line-through; }
.task-card-main {
    flex-grow: 1; min-width: 0;
    padding-left: calc(var(--level-indent) + 20px);
    display: flex; align-items: center; gap: 12px;
}
.task-card-main::before {
    content: ''; width: 8px; height: 8px; border-radius: 50%;
    background-color: var(--label-color, transparent);
    flex-shrink: 0; transition: background-color 0.2s;
}
.task-card.has-label-color .task-card-main::before { background-color: var(--label-color); }
.task-toggle {
    position: absolute; top: 50%;
    left: calc(var(--level-indent) - 12px);
    transform: translateY(-50%);
    width: 32px; height: 32px;
    display: flex; align-items: center; justify-content: center;
    color: var(--text-secondary); cursor: pointer; border-radius: 50%;
}
.task-toggle:hover { color: var(--primary); }
.task-toggle.hidden { display: none; }
.task-toggle svg { width: 14px; height: 14px; transition: transform 0.2s ease-out; }
.task-toggle:not(.collapsed) svg { transform: rotate(90deg); }

.task-content-wrapper { min-width: 0; }
.task-text { font-weight: 500; }
.task-meta { display: flex; align-items: center; gap: 10px; font-size: 0.85em; color: var(--text-secondary); margin-top: 3px; }
.task-labels { display: flex; flex-wrap: wrap; gap: 6px; }
.task-label-badge {
    padding: 2px 8px; border-radius: 10px; font-size: 0.9em; font-weight: 500;
    background-color: #e9e9eb; color: #505052;
}
.task-actions { display: flex; align-items: center; margin-left: auto; }
.task-actions button {
    width: 32px; height: 32px; padding: 0;
    background: none; color: var(--text-secondary);
    border-radius: 50%;
}
.task-actions button:hover { background: #e5e5e5; color: var(--text-primary); }
.task-actions svg { width: 17px; height: 17px; }

/* Calendar */
#calendar-container .fc { border: none; font-family: var(--font-main); height: 100%; }

@media (max-width: 900px) {
    #app-container { flex-direction: column; }
    #left-pane { width: 100%; height: auto; max-height: 50vh; border-right: none; border-bottom: 1px solid var(--border-color); }
    #right-pane { padding: 16px; flex-grow: 1; }
}

.loading-indicator { display: flex; align-items: center; justify-content: center; gap: 8px; }
.spinner { width: 18px; height: 18px; border: 2px solid rgba(255, 255, 255, 0.3); border-top-color: #fff; border-radius: 50%; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ===============================================
 * Modal (汎用)
 * =============================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: var(--bg-pane);
    padding: 24px;
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    width: 90%;
    max-width: 450px;
    border: 1px solid var(--border-color);
}

.modal-header {
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 16px;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.modal-body {
    margin: 0 0 12px;
    color: var(--text-secondary);
    line-height: 1.6;
    max-height: 400px;
    overflow: auto;
}

.modal-footer {
    margin-top: 24px;
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

/* --- Label Editor & General UI Polish --- */
#label-editor-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.label-editor-item {
    display: grid;
    grid-template-columns: auto 1fr auto auto;
    align-items: center;
    gap: 10px;
    padding: 8px;
    border-radius: var(--radius-md);
    background-color: var(--bg-app);
    position: relative;
}

.label-color-preview {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    flex-shrink: 0;
    border: 2px solid var(--bg-pane);
    box-shadow: 0 0 0 1px var(--border-color);
    cursor: pointer;
}

.label-name-input {
    flex-grow: 1;
    border: none;
    background: transparent;
    padding: 4px 0;
    font-size: 0.95em;
    color: var(--text-primary);
}
.label-name-input:focus {
    outline: none;
    box-shadow: none;
}

.label-editor-controls {
    display: flex;
    align-items: center;
    gap: 4px;
}

.label-editor-controls button {
    width: 28px;
    height: 28px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
}
.label-editor-controls button:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}
.label-editor-controls.delete-label-btn:hover {
    color: var(--danger);
}
.label-editor-controls svg {
    width: 16px;
    height: 16px;
}

.priority-control {
    display: flex;
    background-color: #e9e9eb;
    border-radius: var(--radius-md);
    padding: 2px;
}

.priority-control button {
    padding: 4px 8px;
    font-size: 0.8em;
    font-weight: 500;
    background-color: transparent;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
}

.priority-control button.active {
    background-color: #fff;
    color: var(--text-primary);
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

#label-add-container {
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
}

#new-label-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

#new-label-form .form-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

#new-label-name {
    flex-grow: 1;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: #fff;
}
#new-label-name:focus {
    border-color: var(--primary);
    box-shadow: var(--shadow-focus);
}

#add-new-label-btn {
    padding: 0;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background-color: var(--primary);
    color: white;
    flex-shrink: 0;
}

#add-new-label-btn svg {
    width: 18px;
    height: 18px;
}

/* General Polish */
input, textarea, select, button {
    font-family: var(--font-main);
    font-size: 1em;
}

input[type="text"], textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: #fff;
    transition: var(--transition);
}
input[type="text"]:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: var(--shadow-focus);
}

button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 16px;
    border-radius: var(--radius-md);
    border: none;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    background-color: var(--primary);
    color: var(--text-on-primary);
}
button:hover:not(:disabled) {
    opacity: 0.85;
}
button:disabled {
    background-color: #e0e0e0;
    color: var(--text-secondary);
    cursor: not-allowed;
}

/* --- Popovers & Palettes --- */
.popover {
    position: absolute;
    background: var(--bg-pane);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    border: 1px solid var(--border-color);
    z-index: 1000;
    display: none; /* Hidden by default */
    padding: 8px;
}

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

.color-box {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition);
}
.color-box:hover {
    transform: scale(1.1);
}
.color-box.selected {
    border-color: var(--primary);
}

.label-select-popover {
    padding: 12px;
    width: 280px;
}

.label-select-popover h3 {
    margin: 0 0 12px 0;
    font-size: 1em;
    font-weight: 600;
}

.label-select-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.label-select-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color 0.2s;
}
.label-select-item:hover {
    background-color: var(--bg-hover);
}

.label-select-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

.label-select-item .label-color-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.label-select-item .label-name {
    flex-grow: 1;
}

/* 変更点ツリー（履歴の可視化）:
   - #loading-overlay のスタイルは変更なし
   - .modal-overlay, .modal-content, .modal-header, .modal-body, .modal-footer も変更なし
   - 直近の変更はありません（前回までの修正はJS側のみ）
   - もし履歴ツリーをCSSで表現したい場合は、下記のようなコメントで差分を示します
*/

/*
履歴ツリー例:
style.css
└─ #loading-overlay
   ├─ position: absolute;（変更なし）
   ├─ display: flex;（変更なし）
   └─ ...（他のプロパティも変更なし）
└─ .modal-overlay, .modal-content, ...（変更なし）
*/