:root {
    --bg-color: #f4f4f4;
    --card-bg: #ffffff;
    --text-color: #333;
    --accent-color: #000;
    --grid-color: #e0e0e0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow: hidden; /* Prevent native scroll */
}

#app {
    width: 100vw;
    height: 100vh;
    position: relative;
    overflow: hidden;
    cursor: grab;
}

#app:active {
    cursor: grabbing;
}

.canvas-container {
    position: absolute;
    transform-origin: 0 0;
    will-change: transform;
}

/* Grid Background */
.grid-background {
    position: absolute;
    top: -5000px;
    left: -5000px;
    width: 10000px;
    height: 10000px;
    background-image: 
        linear-gradient(var(--grid-color) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 20px 20px;
    opacity: 0.5;
    pointer-events: none;
}

/* UI Controls */
.ui-controls {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    background: white;
    padding: 10px;
    border-radius: 50px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    z-index: 100;
}

.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    background: #f0f0f0;
}

/* Cards */
.card {
    position: absolute;
    width: 300px;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    padding: 20px;
    cursor: default;
    transition: box-shadow 0.2s, transform 0.1s;
    user-select: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.card:hover {
    box-shadow: 0 8px 24px rgba(0,0,0,0.12);
    z-index: 10 !important;
}

.card-header {
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 4px;
    cursor: pointer;
}

.card-content {
    padding: 15px;
    font-size: 0.9rem;
    color: #555;
    flex: 1; /* fills remaining space */
    overflow: hidden; /* clip extra text */
    text-overflow: ellipsis; /* nice to have but multiline needs webkit-box usually */
    white-space: pre-wrap; /* preserve basic formatting */
    mask-image: linear-gradient(180deg, #000 60%, transparent);
    -webkit-mask-image: linear-gradient(180deg, #000 60%, transparent);
}

.card-summary {
    font-size: 0.9rem;
    color: #666;
    line-height: 1.4;
}

.card-meta {
    font-size: 0.8rem;
    color: #999;
    margin-top: auto;
}

.card-drag-handle {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 24px;
    cursor: move;
}

/* Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal {
    background: white;
    width: 400px;
    max-height: 80vh;
    border-radius: 12px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 20px;
    justify-content: flex-end;
}

#modal-search-input {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    box-sizing: border-box; /* Ensure padding doesn't affect width */
}

.modal h2 {
    margin: 0;
    font-size: 1.2rem;
}

.post-list {
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.post-item {
    padding: 10px;
    border: 1px solid #eee;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
}

.post-item:hover {
    background: #f9f9f9;
}

.close-btn {
    align-self: flex-end;
    padding: 6px 12px;
    cursor: pointer;
}

.hidden {
    display: none !important;
}

/* Connection Layer */
.connection-layer {
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 0;
    overflow: visible;
    pointer-events: none;
    z-index: 1; /* Below cards */
}

.connection-line {
    stroke: #aaa;
    stroke-width: 2px;
    fill: none;
    pointer-events: all; /* If we want to click to delete later */
}

.connection-arrowhead {
    fill: #aaa;
}


/* Resize Handle */
.resize-handle {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 15px;
    height: 15px;
    cursor: nwse-resize;
    z-index: 25;
}

.resize-handle::after {
    content: '';
    position: absolute;
    right: 4px;
    bottom: 4px;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 0 0 8px 8px;
    border-color: transparent transparent #ccc transparent;
}

.card:hover .resize-handle::after {
    border-color: transparent transparent #666 transparent;
}

/* Connection Ports */
.connection-port {
    position: absolute;
    width: 10px;
    height: 10px;
    background: #fff;
    border: 2px solid #666;
    border-radius: 50%;
    cursor: crosshair;
    opacity: 0; 
    transition: opacity 0.2s, background 0.2s, transform 0.2s;
    z-index: 20;
}


.card:hover .connection-port {
    opacity: 1;
}

.connection-port:hover {
    background: #000;
    transform: scale(1.2);
}

.port-top { top: -6px; left: 50%; transform: translateX(-50%); }
.port-bottom { bottom: -6px; left: 50%; transform: translateX(-50%); }
.port-left { left: -6px; top: 50%; transform: translateY(-50%); }
.port-right { right: -6px; top: 50%; transform: translateY(-50%); }

.card.connecting .connection-port {
    opacity: 1;
}

/* Connection Line Hover */
.connection-line:hover {
    stroke: #666;
    stroke-width: 4px;
    cursor: pointer;
}


/* Sidebar */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 250px;
    height: 100vh;
    background: white;
    box-shadow: 2px 0 12px rgba(0,0,0,0.05);
    z-index: 100;
    display: flex;
    flex-direction: column;
    padding: 20px;
    box-sizing: border-box;
    border-right: 1px solid #f0f0f0;
}

.sidebar h2 {
    font-size: 1.2rem;
    margin: 0 0 20px 0;
    font-weight: 600;
}

.canvas-list {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.canvas-item {
    padding: 10px 14px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.95rem;
    color: #666;
    transition: all 0.2s;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.canvas-item:hover {
    background: #f5f5f5;
    color: #333;
}

.canvas-item.active {
    background: #000;
    color: #fff;
}

.canvas-item .delete-canvas-btn {
    opacity: 0;
    background: none;
    border: none;
    color: inherit;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0 4px;
    line-height: 1;
}

.canvas-item:hover .delete-canvas-btn {
    opacity: 0.5;
}

.canvas-item:hover .delete-canvas-btn:hover {
    opacity: 1;
}


/* Adjust Main App for Sidebar */
#app {
    margin-left: 250px; /* Offset for sidebar */
    width: calc(100vw - 250px);
}

.ui-controls {
    /* Center in the remaining space */
    left: calc(50% + 125px); 
}


/* Context Menu */
.context-menu {
    position: fixed;
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    padding: 6px 0;
    z-index: 2000;
    min-width: 120px;
}

.context-menu-item {
    padding: 8px 16px;
    cursor: pointer;
    font-size: 0.9rem;
    color: #cc0000; /* Destructive action style */
    display: flex;
    align-items: center;
    gap: 8px;
}

.context-menu-item:hover {
    background: #fff0f0;
}