:root {
    color-scheme: dark;
    --bg-color: #11141a;
    --panel-bg: rgba(20, 24, 30, 0.92);
    --accent: #7c5cff;
    --accent-light: #9d7cff;
    --text-primary: #f5f7ff;
    --text-secondary: #9aa4c2;
    --success: #1ed5a3;
    --danger: #ff4d6d;
    --border-color: rgba(255, 255, 255, 0.08);
}

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

html,
body {
    height: 100%;
}

body {
    font-family: "Inter", "Segoe UI", sans-serif;
    background: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    height: 100vh;
    overflow: hidden;
    user-select: none;
    display: flex;
    flex-direction: column;
    -webkit-tap-highlight-color: transparent;
}

.app-shell {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.mode-switcher {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    padding: 16px;
    background: rgba(10, 12, 18, 0.85);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.mode-button {
    flex: 0 0 auto;
    padding: 10px 18px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: var(--panel-bg);
    color: var(--text-primary);
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 160ms ease;
}

.mode-button[aria-pressed="true"] {
    background: rgba(124, 92, 255, 0.25);
    border-color: rgba(124, 92, 255, 0.5);
}

.workspace {
    flex: 1;
    display: flex;
    width: 100%;
    min-height: 0;
    gap: 0;
}

.workspace-left {
    position: relative;
    flex: 1;
    min-width: 0;
    min-height: 0;
}

.workspace--compare .workspace-left {
    flex: 1 1 55%;
}

.workspace--free .comparison-panel {
    display: none;
}

.workspace--compare .comparison-panel {
    display: flex;
}

#app {
    position: relative;
    width: 100%;
    height: 100%;
}

#graph-canvas {
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 20%, rgba(124, 92, 255, 0.06), transparent 45%),
                radial-gradient(circle at 80% 30%, rgba(30, 213, 163, 0.05), transparent 50%),
                linear-gradient(135deg, #161b22 0%, #0e1117 100%);
    cursor: grab;
    touch-action: none;
    outline: none;
}

#graph-canvas:focus-visible {
    box-shadow: 0 0 0 3px rgba(124, 92, 255, 0.4);
}

#graph-canvas.dragging {
    cursor: grabbing;
}

#ui-layer {
    position: absolute;
    top: 16px;
    left: 16px;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: 12px;
    z-index: 10;
    max-width: calc(100% - 32px);
}

.comparison-panel {
    width: 45%;
    max-width: 520px;
    background: rgba(12, 15, 22, 0.95);
    border-left: 1px solid var(--border-color);
    padding: 24px;
    display: none;
    flex-direction: column;
    gap: 20px;
    min-height: 0;
    height: 100%;
    overflow: hidden;
}

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

.panel-title {
    flex: 1;
}

.panel-header h2 {
    font-size: 1.25rem;
    margin-bottom: 6px;
}

.panel-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

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

.panel-body {
    display: flex;
    flex-direction: column;
    gap: 18px;
    flex: 1 1 auto;
    min-height: 0;
}

.panel-toggle {
    display: none;
    padding: 6px 14px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
}

.comparison-panel[data-collapsed="true"] .panel-body {
    display: none;
}

.comparison-panel[data-collapsed="true"] {
    gap: 12px;
}

.comparison-list {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    padding-right: 4px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.comparison-card {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 14px;
    background: rgba(18, 22, 30, 0.9);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.comparison-card h3 {
    font-size: 1rem;
}

.comparison-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.comparison-card button {
    align-self: flex-start;
}

.empty-state {
    border: 1px dashed var(--border-color);
    border-radius: 12px;
    padding: 24px;
    text-align: center;
    color: var(--text-secondary);
}

.empty-state p {
    margin-bottom: 6px;
    color: var(--text-primary);
}

@media (max-width: 1024px) {
    .workspace {
        flex-direction: column;
        height: auto;
        min-height: 100%;
    }

    .workspace--compare .comparison-panel {
        width: 100%;
        max-width: none;
        border-left: none;
        border-top: 1px solid var(--border-color);
    }
}

@media (max-width: 768px) {
    html,
    body {
        height: auto;
        min-height: 100%;
    }

    body {
        overflow: auto;
    }

    .mode-switcher {
        position: sticky;
        top: 0;
        z-index: 15;
    }

    .workspace {
        flex-direction: column;
        height: auto;
    }

    .workspace-left {
        min-height: calc(100vh - 140px);
    }

    #app {
        min-height: 65vh;
        height: calc(100vh - 150px);
    }

    .workspace--compare .workspace-left {
        flex-basis: auto;
    }

    .comparison-panel {
        width: 100%;
        max-width: none;
        padding: 18px;
    }

    .panel-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .panel-header h2 {
        font-size: 1.1rem;
    }

    .panel-header p {
        font-size: 0.85rem;
    }
}

.ui-button {
    padding: 8px 14px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--panel-bg);
    color: var(--text-primary);
    font-size: 0.875rem;
    letter-spacing: 0.01em;
    cursor: pointer;
    transition: background 180ms ease, border 180ms ease;
}

.ui-button:hover {
    background: rgba(124, 92, 255, 0.16);
    border-color: rgba(124, 92, 255, 0.4);
}

.ui-button:active {
    background: rgba(124, 92, 255, 0.28);
}

.ui-row {
    display: flex;
    gap: 8px;
    align-items: center;
}

.ui-row-primary {
    flex-wrap: wrap;
}

.ui-row-secondary {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.ui-row-secondary .ui-button {
    flex: 1 1 140px;
}

.ui-button[data-variant="outline"] {
    border-style: dashed;
}

.ui-button[disabled] {
    opacity: 0.55;
    cursor: not-allowed;
}

.ui-select-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.ui-select {
    appearance: none;
    -webkit-appearance: none;
    padding: 8px 32px 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: var(--panel-bg);
    color: var(--text-primary);
    font-size: 0.85rem;
    cursor: pointer;
    letter-spacing: 0.01em;
    min-width: 120px;
}

.ui-select:focus {
    outline: none;
    border-color: rgba(124, 92, 255, 0.7);
    box-shadow: 0 0 0 2px rgba(124, 92, 255, 0.25);
}

.ui-select-wrapper::after {
    content: "▾";
    position: absolute;
    right: 12px;
    pointer-events: none;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

@media (max-width: 720px) {
    #ui-layer {
        top: 12px;
        left: 12px;
        right: 12px;
        max-width: unset;
        flex-direction: column;
        gap: 12px;
        width: calc(100% - 24px);
    }

    .ui-row-primary {
        width: 100%;
        justify-content: space-between;
        gap: 8px;
    }

    .ui-row-primary .ui-button {
        flex: 1 1 calc(33% - 8px);
        text-align: center;
        min-width: 0;
    }
    
    .ui-row-primary .button-save {
        order: 3;
    }
    
    .ui-row-primary .button-reset {
        order: 2;
    }
    
    .ui-row-primary .button-load {
        order: 1;
    }

    .ui-row-secondary {
        display: grid;
        grid-template-columns: repeat(2, minmax(0, 1fr));
        grid-auto-rows: 1fr;
        gap: 10px;
    }

    .ui-row-secondary .ui-button {
        width: 100%;
        justify-content: center;
        font-size: 0.95rem;
        padding: 10px 0;
    }

    .ui-row-primary .ui-button,
    .ui-row-secondary .ui-button {
        font-size: 0.95rem;
    }
}

.context-menu {
    position: absolute;
    min-width: 180px;
    background: var(--panel-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
    overflow: hidden;
    z-index: 20;
}

.context-menu ul {
    list-style: none;
}

.context-menu li {
    padding: 10px 14px;
    font-size: 0.875rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    transition: background 160ms ease;
}

.context-menu li:hover {
    background: rgba(124, 92, 255, 0.16);
}

.context-menu li[aria-disabled="true"] {
    color: var(--text-secondary);
    cursor: not-allowed;
}

.context-menu li[aria-disabled="true"]:hover {
    background: transparent;
}

.node-label {
    font-size: 0.875rem;
    fill: var(--text-primary);
    pointer-events: none;
}

.node-rect {
    rx: 14;
    ry: 14;
    stroke-width: 2;
    stroke: rgba(124, 92, 255, 0.45);
    fill: rgba(17, 20, 26, 0.86);
    filter: drop-shadow(0 10px 35px rgba(0, 0, 0, 0.45));
    pointer-events: all;
}

.node-root .node-rect {
    stroke: var(--accent);
    fill: rgba(124, 92, 255, 0.2);
}

.node-selected .node-rect {
    stroke: var(--success);
}

.node-foreign {
    pointer-events: none;
}

.primary-link {
    stroke: rgba(157, 124, 255, 0.65);
    stroke-width: 2;
    fill: none;
}

.association-link {
    stroke: rgba(30, 213, 163, 0.7);
    stroke-width: 2;
    fill: none;
    stroke-dasharray: 6 6;
}

.link-label {
    fill: var(--text-secondary);
    font-size: 0.75rem;
    pointer-events: none;
}

.temp-link {
    stroke: rgba(255, 255, 255, 0.45);
    stroke-width: 2;
    fill: none;
    stroke-dasharray: 4 4;
}

.inline-editor {
    width: 100%;
    height: 100%;
    padding: 12px;
    border: none;
    border-radius: 10px;
    background: transparent;
    color: var(--text-primary);
    font: inherit;
    resize: none;
    white-space: pre-wrap;
    outline: none;
}