:root {
    --primary-bg: #f4f7fc;
    --sidebar-bg: #ffffff;
    --header-bg: #ffffff;
    --text-color: #333;
    --border-color: #e0e0e0;
    --accent-color: #4285f4;
    --hover-bg: #e8f0fe;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

body, html {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--primary-bg);
    color: var(--text-color);
    height: 100vh;
    overflow: hidden;
}

.container {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 280px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    box-shadow: 2px 0 5px var(--shadow-color);
}

.sidebar-header {
    padding: 20px;
    font-size: 1.5em;
    font-weight: bold;
    color: var(--accent-color);
    border-bottom: 1px solid var(--border-color);
}

.sidebar-menu {
    flex-grow: 1;
    overflow-y: auto;
    padding: 10px 0;
}

.menu-section h3 {
    padding: 10px 20px;
    margin: 0;
    font-size: 0.9em;
    color: #666;
    text-transform: uppercase;
    font-weight: bold;
}

.menu-item {
    display: block;
    padding: 12px 20px;
    text-decoration: none;
    color: var(--text-color);
    border-left: 3px solid transparent;
    transition: all 0.2s ease;
}

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

.menu-item.active {
    background-color: var(--hover-bg);
    border-left-color: var(--accent-color);
    font-weight: 500;
}

.main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 4px var(--shadow-color);
}

.mode-switch {
    display: flex;
    align-items: center;
}

.mode-switch label {
    margin-right: 10px;
    font-weight: 500;
}

.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--accent-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.actions button {
    padding: 10px 15px;
    margin-left: 10px;
    border: 1px solid var(--border-color);
    background-color: #fff;
    color: var(--accent-color);
    border-radius: 5px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s ease;
}

.actions button:hover {
    background-color: var(--accent-color);
    color: #fff;
}

.canvas {
    flex-grow: 1;
    padding: 20px;
    background-color: #e9eef6;
    background-image: 
        repeating-linear-gradient(0deg, #f0f0f0, #f0f0f0 1px, transparent 1px, transparent 20px),
        repeating-linear-gradient(90deg, #f0f0f0, #f0f0f0 1px, transparent 1px, transparent 20px);
    background-size: 20px 20px;
    overflow: auto;
    position: relative;
}

.canvas-title {
    margin-bottom: 20px;
    font-size: 1.8em;
    color: #333;
}

#canvas-content {
    width: 100%;
    height: 100%;
    position: relative;
    transform-origin: 0 0;
}

.diagram-element {
    position: absolute;
    background-color: #fff;
    border: 1px solid #999;
    padding: 10px;
    cursor: move;
    box-shadow: 3px 3px 7px rgba(0,0,0,0.15);
    border-radius: 4px;
    text-align: center;
    font-size: 0.9em;
}

.process {
    border-radius: 50%;
    width: 80px; /* Adjusted for a perfect circle */
    height: 80px; /* Adjusted for a perfect circle */
    display: flex; /* To center text vertically */
    align-items: center; /* To center text vertically */
    justify-content: center; /* To center text horizontally */
}

.process.no-detail {
    background-color: #f0f0f0;
    border-color: #ccc;
}

.entity {
    border-radius: 8px;
    background-color: #fff8e1;
    width: 120px;
}

.datastore {
    border-left: none;
    border-right: none;
    border-top: 1px solid #999;
    border-bottom: 1px solid #999;
    width: 140px;
    background-color: #e3f2fd;
}

/* 簡易的な矢印 */
.data-flow {
    position: absolute;
    height: 2px;
    background-color: #333;
    transform-origin: 0 50%;
    cursor: pointer; /* クリック可能を示すカーソル */
}
/* クリック領域を広げるための疑似要素 */
.data-flow::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 0;
    right: 0;
    bottom: -8px;
    background: transparent;
}
.data-flow::after {
    content: '';
    position: absolute;
    right: -1px;
    top: -4px;
    border-style: solid;
    border-width: 5px 0 5px 8px;
    border-color: transparent transparent transparent #333;
}

.data-flow-label {
    position: absolute;
    background-color: rgba(255, 255, 255, 0.8);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.8em;
    white-space: nowrap;
    pointer-events: none; /* Allow clicks to pass through to the flow line */
    transform: translate(-50%, -50%);
    z-index: 1; /* Ensure label is above the flow line */
}



.sidebar-menu .menu-item-button {
    display: block;
    width: calc(100% - 40px);
    margin: 5px 20px;
    padding: 10px;
    font-size: 0.9em;
    text-align: left;
    background-color: #fff;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.sidebar-menu .menu-item-button:hover {
    background-color: var(--hover-bg);
    border-color: var(--accent-color);
}
.canvas.drawing-mode {
    cursor: crosshair;
}

.sidebar-menu .menu-item-button:disabled {
    background-color: #f0f0f0;
    cursor: not-allowed;
    color: #999;
}

.context-menu {
    display: none;
    position: absolute;
    background-color: var(--sidebar-bg);
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 10px var(--shadow-color);
    border-radius: 5px;
    padding: 5px 0;
    z-index: 1000;
    min-width: 150px;
}
.context-menu-item {
    padding: 8px 15px;
    cursor: pointer;
    font-size: 0.9em;
}
.context-menu-item:hover {
    background-color: var(--hover-bg);
}

.tooltip {
    display: none;
    position: absolute;
    background-color: #333;
    color: #fff;
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 0.85em;
    z-index: 1001;
    pointer-events: none;
    max-width: 250px;
    white-space: pre-wrap;
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-content {
    position: relative;
    background-color: var(--sidebar-bg);
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    width: 90%;
    max-width: 500px;
    display: flex;
    flex-direction: column;
}

.modal-title {
    margin: 0 0 15px 0;
    font-size: 1.4em;
    color: var(--text-color);
}

.modal-textarea {
    width: 100%;
    height: 200px;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: inherit;
    font-size: 1em;
    resize: vertical;
    margin-bottom: 20px;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
}

.modal-button {
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.2s;
    margin-left: 10px;
}

.modal-button.primary {
    background-color: var(--accent-color);
    color: white;
}
.modal-button.primary:hover {
    background-color: #357ae8;
}

.modal-button {
    background-color: #f0f0f0;
    color: var(--text-color);
}
.modal-button:hover {
    background-color: #e0e0e0;
}