/* Reset and base styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Colors - refined warm palette */
    --color-primary: #3B6FE8;
    --color-primary-hover: #2D5BD4;
    --color-primary-glow: rgba(59, 111, 232, 0.2);
    --color-bg: #EEEAE4;
    --color-white: #FFFFFF;
    --color-gray-50: #F8F7F5;
    --color-gray-100: #F0EEEB;
    --color-gray-200: #E2DFDA;
    --color-gray-300: #CCC8C1;
    --color-gray-400: #9E9A93;
    --color-gray-500: #77736D;
    --color-gray-600: #5A5650;
    --color-gray-700: #3D3A36;
    --color-gray-800: #262420;
    --color-gray-900: #141210;

    /* Sidebar light theme */
    --sidebar-bg: var(--color-white);
    --sidebar-surface: var(--color-gray-50);
    --sidebar-border: var(--color-gray-200);
    --sidebar-text: var(--color-gray-600);
    --sidebar-text-bright: var(--color-gray-900);
    --sidebar-text-dim: var(--color-gray-400);

    /* Layer colors - richer, more saturated */
    --layer-marketing: #E1F0FE;
    --layer-marketing-border: #7CC4FA;
    --layer-marketing-accent: #2B8DD6;
    --layer-experiences: #FCE4F0;
    --layer-experiences-border: #F098C8;
    --layer-experiences-accent: #D4448A;
    --layer-sources: #FDF2C4;
    --layer-sources-border: #EEC440;
    --layer-sources-accent: #C89B18;
    --layer-analysis: #E4E2FF;
    --layer-analysis-border: #A8A2F8;
    --layer-analysis-accent: #6B5CE7;
    --layer-activation: #D0F5E4;
    --layer-activation-border: #5EDEA4;
    --layer-activation-accent: #1FAF6E;

    /* Typography */
    --font-family: 'Lexend', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Spacing */
    --header-height: 56px;
    --sidebar-width: 272px;
    --canvas-width: 1200px;
    --canvas-height: 500px;
    --canvas-padding: 40px;
    --layer-gap: 14px;
    --layer-max-height: 81px;
    --slot-columns: 6;
    --model-picker-gap: 20px;
    --model-picker-height: 72px;
    --model-picker-space: calc(var(--model-picker-gap) + var(--model-picker-height));

    /* Shadows - warm tinted */
    --shadow-sm: 0 1px 3px rgba(20, 18, 16, 0.06), 0 1px 2px rgba(20, 18, 16, 0.04);
    --shadow-md: 0 4px 12px rgba(20, 18, 16, 0.08), 0 2px 4px rgba(20, 18, 16, 0.04);
    --shadow-lg: 0 12px 32px rgba(20, 18, 16, 0.12), 0 4px 8px rgba(20, 18, 16, 0.06);
    --shadow-xl: 0 20px 48px rgba(20, 18, 16, 0.16), 0 8px 16px rgba(20, 18, 16, 0.08);

    /* Border radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;
    --radius-xl: 20px;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-gray-800);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-weight: 400;
    letter-spacing: -0.01em;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Sidebar Header */
.sidebar-header {
    height: var(--header-height);
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    display: flex;
    align-items: center;
    justify-content: flex-start;
    padding: 0 20px;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo svg rect {
    fill: var(--color-primary);
    rx: 10;
}

.logo-text {
    font-size: 17px;
    font-weight: 600;
    color: var(--color-gray-900);
    letter-spacing: -0.02em;
}

.header-actions {
    display: flex;
    gap: 12px;
}

/* Buttons */
.btn {
    padding: 8px 16px;
    font-size: 13px;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    font-family: inherit;
    letter-spacing: -0.01em;
}

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

.btn-primary:hover {
    background: var(--color-primary-hover);
    box-shadow: 0 4px 16px var(--color-primary-glow);
}

.btn-secondary {
    background: var(--color-white);
    color: var(--color-gray-700);
    border: 1px solid var(--color-gray-300);
}

.btn-secondary:hover {
    background: var(--color-gray-50);
    border-color: var(--color-gray-400);
}

/* App Body - Sidebar + Canvas Layout */
.app-body {
    flex: 1;
    display: flex;
    min-height: 0;
    height: 100vh;
}

/* Sidebar - Dark theme */
.sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    border-right: 1px solid var(--sidebar-border);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    flex-shrink: 0;
    min-height: 0;
    max-height: 100vh;
}

/* Custom scrollbar for sidebar */
.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--color-gray-300);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--color-gray-400);
}

.sidebar-section {
    padding: 12px 14px;
    flex: 1;
    overflow-y: auto;
    min-height: 0;
}

/* Category Picker */
.category-picker {
    display: flex;
    justify-content: center;
    gap: 6px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--sidebar-border);
    background: var(--color-gray-50);
}

.category-tab {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    background: var(--color-white);
    border: 1.5px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    color: var(--sidebar-text-dim);
}

.category-tab:hover {
    border-color: var(--color-gray-300);
    background: var(--color-gray-50);
    color: var(--color-gray-700);
    transform: translateY(-1px);
}

.category-tab.active {
    color: var(--color-white);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transform: translateY(-1px);
}

/* Category-specific active colors */
.category-tab[data-category="marketing"].active {
    background: var(--layer-marketing-accent);
    border-color: var(--layer-marketing-accent);
}

.category-tab[data-category="experiences"].active {
    background: var(--layer-experiences-accent);
    border-color: var(--layer-experiences-accent);
}

.category-tab[data-category="sources"].active {
    background: var(--layer-sources-accent);
    border-color: var(--layer-sources-accent);
}

.category-tab[data-category="analysis"].active {
    background: var(--layer-analysis-accent);
    border-color: var(--layer-analysis-accent);
}

.category-tab[data-category="activation"].active {
    background: var(--layer-activation-accent);
    border-color: var(--layer-activation-accent);
}

.category-tab svg {
    flex-shrink: 0;
}

/* Component List - dark theme */
.component-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.component-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border: 1px solid transparent;
}

.component-item:hover {
    background: var(--color-gray-50);
    border-color: var(--color-gray-200);
}

.component-item:active {
    background: var(--color-gray-100);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 1px var(--color-primary-glow);
    transform: scale(0.98);
}

.component-icon {
    width: 34px;
    height: 34px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

/* Category-colored component icons */
.component-icon.category-marketing {
    background: var(--layer-marketing);
    color: var(--layer-marketing-accent);
}

.component-icon.category-experiences {
    background: var(--layer-experiences);
    color: var(--layer-experiences-accent);
}

.component-icon.category-sources {
    background: var(--layer-sources);
    color: var(--layer-sources-accent);
}

.component-icon.category-analysis {
    background: var(--layer-analysis);
    color: var(--layer-analysis-accent);
}

.component-icon.category-activation {
    background: var(--layer-activation);
    color: var(--layer-activation-accent);
}

.component-name {
    font-size: 13px;
    font-weight: 400;
    color: var(--sidebar-text);
    letter-spacing: -0.01em;
}

/* Custom entry item styling */
.component-item.custom-entry {
    background: var(--color-gray-50);
    border: 1px dashed var(--color-gray-300);
}

.component-item.custom-entry .component-icon {
    background: var(--color-gray-200);
    color: var(--color-gray-500);
}

/* Add Custom Entry - dark theme */
.add-custom {
    padding: 14px 16px;
    border-top: 1px solid var(--sidebar-border);
    background: var(--sidebar-bg);
}

.add-custom-input-wrapper {
    display: flex;
    gap: 8px;
}

.add-custom-input {
    flex: 1;
    padding: 10px 12px;
    font-size: 13px;
    font-family: inherit;
    border: 1.5px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    background: var(--color-white);
    color: var(--color-gray-800);
    transition: all 0.2s ease;
    letter-spacing: -0.01em;
}

.add-custom-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.add-custom-input::placeholder {
    color: var(--color-gray-400);
}

.add-custom-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-white);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    flex-shrink: 0;
}

.add-custom-btn:hover {
    background: var(--color-primary-hover);
    box-shadow: 0 4px 16px var(--color-primary-glow);
    transform: translateY(-1px);
}

.add-custom-btn:active {
    transform: scale(0.95) translateY(0);
}

/* Templates (collapsible) */
.templates-section {
    border-top: 1px solid var(--sidebar-border);
    background: var(--sidebar-bg);
}

.templates-summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    font-size: 13px;
    font-weight: 600;
    color: var(--sidebar-text);
    cursor: pointer;
    list-style: none;
    user-select: none;
    transition: background 0.15s ease;
}

.templates-summary::-webkit-details-marker {
    display: none;
}

.templates-summary:hover {
    background: var(--color-gray-50);
}

.templates-chevron {
    flex-shrink: 0;
    stroke: currentColor;
    transition: transform 0.2s ease;
}

.templates-section[open] .templates-chevron {
    transform: rotate(180deg);
}

.templates-list {
    list-style: none;
    padding: 0 16px 12px;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.templates-list li {
    margin: 0;
}

.template-option {
    display: block;
    width: 100%;
    text-align: left;
    padding: 8px 12px;
    font-size: 13px;
    font-family: inherit;
    color: var(--color-gray-700);
    background: var(--color-gray-50);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.15s ease;
}

.template-option:hover {
    background: var(--color-gray-100);
    border-color: var(--color-gray-300);
    color: var(--color-gray-900);
}

.custom-toolbar {
    padding: 10px 16px 16px;
    border-top: 1px solid var(--sidebar-border);
    background: var(--sidebar-bg);
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.toolbar-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 12px;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    background: var(--color-white);
    color: var(--color-gray-700);
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.15s ease;
}

.toolbar-btn svg {
    stroke: currentColor;
}

.toolbar-btn:hover {
    background: var(--color-gray-50);
    border-color: var(--color-gray-400);
    color: var(--color-gray-900);
}

.toolbar-btn:active {
    transform: translateY(1px);
}


/* Canvas Container */
.canvas-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    gap: 20px;
    padding: clamp(16px, 2.5vw, var(--canvas-padding));
    overflow: auto;
    min-height: 0;
    max-height: 100vh;
    height: 100vh;
    position: relative;
    background:
        radial-gradient(circle at 20% 20%, rgba(59, 111, 232, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(107, 92, 231, 0.03) 0%, transparent 50%),
        var(--color-bg);
}

.diagram-header {
    width: var(--canvas-width);
    min-width: var(--canvas-width);
    max-width: var(--canvas-width);
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-gray-200);
    padding: 18px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.diagram-title {
    font-family: var(--font-family);
    font-size: 24px;
    font-weight: 600;
    color: var(--color-gray-900);
    outline: none;
    min-width: 0;
    flex: 1;
    white-space: pre-wrap;
    letter-spacing: -0.02em;
}

.diagram-title:focus {
    box-shadow: inset 0 -2px 0 var(--color-primary);
}

.diagram-last-edited {
    font-size: 12px;
    color: var(--color-gray-400);
    white-space: nowrap;
    flex-shrink: 0;
    font-weight: 300;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.canvas {
    width: var(--canvas-width);
    min-width: var(--canvas-width);
    max-width: var(--canvas-width);
    flex: 0 0 auto;
    height: auto;
    background: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: clamp(20px, 2vw, 32px);
    display: flex;
    flex-direction: column;
    gap: var(--layer-gap);
    min-height: 0;
    position: relative;
    border: 1px solid var(--color-gray-200);
}

.floating-actions {
    position: absolute;
    bottom: clamp(12px, 2vw, 32px);
    right: clamp(12px, 2vw, 32px);
    z-index: 20;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 12px;
}

.canvas-container.is-exporting .floating-actions {
    display: none;
}

.canvas-container.is-exporting {
    height: auto;
    max-height: none;
    overflow: visible;
}

/* Layers */
.layer {
    min-height: var(--layer-min-height);
    flex: 1 1 var(--layer-min-height);
    border-radius: var(--radius-lg);
    border: 2px dashed;
    display: flex;
    flex-direction: column;
    position: relative;
    transition: all 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.layer:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.layer-label {
    position: absolute;
    left: 16px;
    top: 12px;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-gray-500);
    background: inherit;
    padding: 3px 10px;
    border-radius: var(--radius-sm);
    z-index: 3;
    pointer-events: none;
}

.layer-content {
    flex: 1;
    padding: 40px 12px 12px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--layer-gap);
    justify-items: stretch;
    align-items: start;
    position: relative;
    min-height: 110px;
}

.slot-guide-layer {
    position: absolute;
    inset: 0;
    padding: inherit;
    box-sizing: border-box;
    display: grid;
    grid-template-columns: repeat(var(--slot-columns, 6), minmax(0, 1fr));
    grid-auto-rows: 58px;
    gap: var(--layer-gap);
    pointer-events: none;
    z-index: 1;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.layer-content.slot--visible .slot-guide-layer {
    opacity: 1;
}

.slot-guide-ghost {
    border: 2px dashed rgba(59, 111, 232, 0.35);
    border-radius: var(--radius-lg);
    background: rgba(59, 111, 232, 0.05);
    min-height: 58px;
    max-height: 58px;
    width: 100%;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.45);
}

.layer-content.slot-guides-visible .diagram-node {
    position: relative;
    z-index: 2;
}

/* Layer color variants */
.layer-marketing {
    background: var(--layer-marketing);
    border-color: var(--layer-marketing-border);
}

.layer-experiences {
    background: var(--layer-experiences);
    border-color: var(--layer-experiences-border);
}

.layer-sources {
    background: var(--layer-sources);
    border-color: var(--layer-sources-border);
}

.layer-analysis {
    background: var(--layer-analysis);
    border-color: var(--layer-analysis-border);
}

.layer-activation {
    background: var(--layer-activation);
    border-color: var(--layer-activation-border);
}

/* Diagram Nodes */
.diagram-node {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    width: 100%;
    min-height: 58px;
    max-height: 58px;
    background: var(--color-white);
    border: 1.5px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    cursor: default;
    position: relative;
    z-index: 2;
    transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.diagram-node:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.diagram-node:hover .node-remove {
    opacity: 1;
}

/* Category-colored node borders */
.diagram-node.node-marketing {
    border-color: var(--layer-marketing-border);
}

.diagram-node.node-experiences {
    border-color: var(--layer-experiences-border);
}

.diagram-node.node-sources {
    border-color: var(--layer-sources-border);
}

.diagram-node.node-analysis {
    border-color: var(--layer-analysis-border);
}

.diagram-node.node-activation {
    border-color: var(--layer-activation-border);
}

.node-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}

/* Category-colored node icons */
.node-icon.category-marketing {
    background: var(--layer-marketing);
    color: var(--layer-marketing-accent);
}

.node-icon.category-experiences {
    background: var(--layer-experiences);
    color: var(--layer-experiences-accent);
}

.node-icon.category-sources {
    background: var(--layer-sources);
    color: var(--layer-sources-accent);
}

.node-icon.category-analysis {
    background: var(--layer-analysis);
    color: var(--layer-analysis-accent);
}

.node-icon.category-activation {
    background: var(--layer-activation);
    color: var(--layer-activation-accent);
}

.node-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-gray-800);
    line-height: 1.3;
    display: -webkit-box;
    line-clamp: 2;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    word-break: break-word;
    letter-spacing: -0.01em;
}

.node-badges {
    position: absolute;
    left: 56px;
    right: 32px;
    bottom: 8px;
    display: flex;
    flex-wrap: nowrap;
    justify-content: flex-start;
    gap: 2px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.diagram-node[data-id="amplitude-sdk"]:hover .node-badges,
.diagram-node[data-id="amplitude-sdk"].has-active-badges .node-badges {
    opacity: 1;
    pointer-events: auto;
}

.node-badge {
    border: none;
    background: rgba(59, 111, 232, 0.1);
    color: var(--color-primary);
    font-size: 9px;
    font-weight: 600;
    padding: 1px 6px;
    border-radius: 999px;
    cursor: pointer;
    transition: all 0.15s ease;
    display: none;
    pointer-events: none;
    letter-spacing: 0.02em;
}

.diagram-node[data-id="amplitude-sdk"]:hover .node-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    pointer-events: auto;
}

.node-badge:hover {
    background: rgba(59, 111, 232, 0.18);
}

.node-badge.active {
    background: var(--color-primary);
    color: #FFFFFF;
    box-shadow: 0 2px 8px var(--color-primary-glow);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    pointer-events: auto;
}

.diagram-node[data-id="amplitude-sdk"] .node-label {
    padding-bottom: 12px;
}

.node-note {
    position: absolute;
    top: 50%;
    right: -8px;
    transform: translateY(-50%);
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-white);
    border: 1.5px solid var(--color-gray-300);
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    transition: all 0.2s ease;
    color: var(--color-gray-400);
}

.diagram-node:hover .node-note {
    opacity: 1;
}

.diagram-node.has-note .node-note {
    opacity: 1;
}

.node-note:hover {
    background: #FEF9C3;
    border-color: #EEC440;
    color: var(--layer-sources-accent);
}

/* AI Dialog */
.ai-dialog {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(20, 18, 16, 0.5);
    backdrop-filter: blur(4px);
    z-index: 9999;
    padding: 16px;
    animation: dialogOverlayIn 0.2s ease;
}

@keyframes dialogOverlayIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.ai-dialog[hidden] {
    display: none;
}

.ai-dialog__content {
    background: var(--color-white);
    color: var(--color-gray-900);
    border-radius: var(--radius-xl);
    max-width: 520px;
    width: 100%;
    box-shadow: var(--shadow-xl);
    padding: 28px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    animation: dialogSlideIn 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.ai-dialog__content h2 {
    font-family: var(--font-family);
    font-weight: 600;
    font-size: 20px;
    color: var(--color-gray-900);
    letter-spacing: -0.02em;
}

@keyframes dialogSlideIn {
    from {
        opacity: 0;
        transform: translateY(12px) scale(0.97);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.ai-dialog--loading .ai-dialog__content {
    max-width: 360px;
    transition: max-width 0.25s ease;
}

.ai-dialog__subtitle {
    margin: 0;
    color: var(--color-gray-500);
    font-size: 14px;
    line-height: 1.6;
    font-weight: 300;
}

.ai-dialog__textarea {
    width: 100%;
    min-height: 140px;
    padding: 14px;
    border: 1.5px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: inherit;
    resize: vertical;
    color: var(--color-gray-800);
    background: var(--color-gray-50);
    transition: all 0.2s ease;
    letter-spacing: -0.01em;
}

.ai-dialog__textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-glow);
    background: var(--color-white);
}

.ai-dialog--loading .ai-dialog__textarea,
.ai-dialog--loading .ai-dialog__subtitle {
    display: none;
}

.ai-dialog__actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 4px;
}

.ai-dialog--loading .ai-dialog__actions {
    display: none;
}

.ai-dialog__loading {
    display: none;
    align-items: center;
    gap: 12px;
    padding: 8px 0;
}

.ai-dialog--loading .ai-dialog__loading {
    display: flex;
}

.ai-dialog__loading-text {
    color: var(--color-gray-500);
    font-size: 14px;
    font-weight: 300;
}

.ai-spinner {
    width: 18px;
    height: 18px;
    border: 2px solid var(--color-gray-200);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: ai-spin 0.8s linear infinite;
}

@keyframes ai-spin {
    to {
        transform: rotate(360deg);
    }
}

.ai-dialog__btn {
    border: none;
    border-radius: var(--radius-md);
    padding: 10px 18px;
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    letter-spacing: -0.01em;
}

.ai-dialog__btn--secondary {
    background: var(--color-gray-100);
    color: var(--color-gray-700);
}

.ai-dialog__btn--secondary:hover {
    background: var(--color-gray-200);
}

.ai-dialog__btn--primary {
    background: var(--color-primary);
    color: var(--color-white);
}

.ai-dialog__btn--primary:hover {
    background: var(--color-primary-hover);
    box-shadow: 0 4px 16px var(--color-primary-glow);
}

.ai-dialog__btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.node-remove {
    position: absolute;
    top: -8px;
    right: -8px;
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-white);
    border: 1.5px solid var(--color-gray-300);
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    transition: all 0.2s ease;
    color: var(--color-gray-400);
}

.node-remove:hover {
    background: #FEE2E2;
    border-color: #FCA5A5;
    color: #DC2626;
    transform: scale(1.1);
}

.diagram-node.dragging {
    opacity: 0.6;
    cursor: grabbing;
}

.node-connect {
    position: absolute;
    bottom: -8px;
    right: -8px;
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-white);
    border: 1.5px solid var(--color-gray-300);
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    transition: all 0.2s ease;
    color: var(--color-primary);
}

.diagram-node:hover .node-connect {
    opacity: 1;
}

.node-connect:hover {
    background: var(--layer-marketing);
    border-color: var(--color-primary);
    color: var(--color-primary-hover);
    transform: scale(1.1);
}

.diagram-node.pending-connection {
    box-shadow: 0 0 0 3px var(--color-primary-glow);
}

.layer-content.drag-over {
    border: none;
    background: inherit;
}

/* Node animations */
.diagram-node.entering {
    opacity: 0;
    transform: scale(0.85) translateY(4px);
}

.diagram-node.removing {
    animation: nodeRemove 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

.diagram-node.highlight {
    animation: nodeHighlight 0.7s ease;
}

@keyframes nodeRemove {
    to {
        opacity: 0;
        transform: scale(0.85) translateY(-4px);
    }
}

@keyframes nodeHighlight {
    0%, 100% {
        box-shadow: var(--shadow-sm);
    }
    50% {
        box-shadow: 0 0 0 4px var(--color-primary-glow);
    }
}

/* Sidebar item added state */
.component-item.added {
    background: var(--color-gray-100);
    opacity: 0.5;
}

.component-item.added::after {
    content: '\2713';
    margin-left: auto;
    color: var(--layer-activation-accent);
    font-weight: 600;
    font-size: 12px;
}

/* Layer content empty state */
.layer-content:empty::before {
    content: 'Click items from the sidebar to add them here';
    color: var(--color-gray-400);
    font-size: 12px;
    font-style: italic;
    font-weight: 300;
}

.adjacency-highlight-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 1;
}

.adjacency-highlight {
    position: absolute;
    border: 2px solid rgba(59, 111, 232, 0.25);
    background: rgba(59, 111, 232, 0.06);
    border-radius: var(--radius-xl);
    box-shadow: 0 10px 30px rgba(59, 111, 232, 0.1);
}

.connection-layer {
    position: absolute;
    inset: 0;
    pointer-events: none;
    width: 100%;
    height: 100%;
    z-index: 10;
}

.connection-layer path {
    pointer-events: none;
}

.connection-layer path.connection-hit-area {
    pointer-events: auto;
    cursor: pointer;
}

.connection-layer path.connection-hover {
    filter: drop-shadow(0 0 4px rgba(59, 111, 232, 0.7)) drop-shadow(0 0 10px rgba(59, 111, 232, 0.4));
}

.connection-layer .connection-label {
    font-size: 10px;
    font-style: italic;
    font-weight: 300;
    letter-spacing: 0.02em;
    fill: var(--color-gray-500);
    stroke: rgba(255, 255, 255, 0.95);
    stroke-width: 3;
    paint-order: stroke fill;
    pointer-events: none;
    user-select: none;
}

.connection-context-menu {
    position: fixed;
    display: none;
    flex-direction: column;
    min-width: 160px;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 6px 0;
    z-index: 200;
}

.connection-context-menu.visible {
    display: flex;
}

.connection-context-option {
    background: transparent;
    border: none;
    text-align: left;
    padding: 8px 14px;
    font-size: 13px;
    font-family: inherit;
    color: var(--color-gray-800);
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
}

.connection-context-option:hover {
    background: var(--color-gray-50);
    color: var(--color-primary);
}

.annotation-editor {
    position: fixed;
    min-width: 200px;
    padding: 10px 12px;
    border: 1.5px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    background: var(--color-white);
    color: var(--color-gray-800);
    font-size: 13px;
    font-family: inherit;
    outline: none;
    display: none;
    z-index: 210;
}

.annotation-editor.visible {
    display: block;
}

.node-note-editor {
    position: fixed;
    min-width: 220px;
    min-height: 96px;
    padding: 10px 12px;
    border: 1.5px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    background: var(--color-white);
    color: var(--color-gray-800);
    font-size: 13px;
    font-family: inherit;
    outline: none;
    display: none;
    z-index: 210;
    resize: vertical;
    line-height: 1.4;
    white-space: pre-wrap;
    overflow: auto;
}

.node-note-editor.visible {
    display: block;
}

/* Model picker */
.model-picker {
    position: fixed;
    left: 50%;
    bottom: 24px;
    transform: translateX(-50%);
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    padding: 10px 14px;
    border: 1px solid var(--color-gray-200);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px) saturate(1.5);
    box-shadow: var(--shadow-lg);
    z-index: 150;
    max-width: calc(100% - 32px);
}

.model-option {
    padding: 8px 16px;
    border-radius: 999px;
    border: 1.5px solid var(--color-gray-200);
    background: var(--color-white);
    color: var(--color-gray-600);
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    white-space: nowrap;
    letter-spacing: -0.01em;
}

.model-option:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-1px);
}

.model-option.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
    box-shadow: 0 4px 16px var(--color-primary-glow);
}

/* Menu Button & Dropdown - dark sidebar */
.sidebar-header {
    position: relative;
}

.menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--color-gray-400);
    transition: all 0.2s ease;
    margin-left: auto;
}

.menu-btn:hover {
    background: var(--color-gray-50);
    border-color: var(--color-gray-300);
    color: var(--color-gray-700);
}

.menu-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 8px;
    right: 8px;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 6px 0;
    z-index: 300;
    max-height: 80vh;
    overflow-y: auto;
}

.menu-dropdown.open {
    display: block;
    animation: menuDropIn 0.15s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

@keyframes menuDropIn {
    from {
        opacity: 0;
        transform: translateY(-4px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 10px;
    width: 100%;
    padding: 8px 14px;
    background: transparent;
    border: none;
    font-size: 13px;
    font-weight: 400;
    font-family: inherit;
    color: var(--sidebar-text);
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
    text-align: left;
    letter-spacing: -0.01em;
}

.menu-item:hover {
    background: var(--color-gray-50);
    color: var(--color-gray-900);
}

.menu-item svg {
    flex-shrink: 0;
    color: var(--color-gray-400);
}

.menu-item:hover svg {
    color: var(--color-gray-600);
}

.menu-divider {
    height: 1px;
    background: var(--color-gray-200);
    margin: 4px 0;
}

.menu-label {
    padding: 8px 14px 4px;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-gray-400);
}

.menu-auth {
    padding: 8px 14px;
}

.auth-user {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
}

.auth-avatar {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    flex-shrink: 0;
    border: 1.5px solid var(--color-gray-200);
}

.auth-name {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-gray-700);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.auth-logout-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: transparent;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--color-gray-500);
    flex-shrink: 0;
    transition: all 0.15s ease;
}

.auth-logout-btn:hover {
    background: #FEE2E2;
    border-color: #FCA5A5;
    color: #DC2626;
}


/* Diagrams Panel (right-side slide-over) */
.diagrams-panel-overlay {
    position: fixed;
    inset: 0;
    background: rgba(20, 18, 16, 0.4);
    backdrop-filter: blur(4px);
    z-index: 500;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.diagrams-panel-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

.diagrams-panel-content {
    position: absolute;
    top: 0;
    right: 0;
    width: 400px;
    max-width: 90vw;
    height: 100%;
    background: var(--color-white);
    box-shadow: -8px 0 32px rgba(20, 18, 16, 0.15);
    display: flex;
    flex-direction: column;
    transform: translateX(100%);
    transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.diagrams-panel-overlay.open .diagrams-panel-content {
    transform: translateX(0);
}

.diagrams-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-gray-200);
}

.diagrams-panel-header h2 {
    font-family: var(--font-family);
    font-size: 18px;
    font-weight: 600;
    color: var(--color-gray-900);
    margin: 0;
    letter-spacing: -0.02em;
}

.diagrams-panel-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--color-gray-400);
    transition: all 0.15s ease;
}

.diagrams-panel-close:hover {
    background: var(--color-gray-100);
    color: var(--color-gray-800);
}

.diagrams-list {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.diagrams-loading,
.diagrams-empty {
    padding: 32px 16px;
    text-align: center;
    color: var(--color-gray-400);
    font-size: 14px;
    font-weight: 300;
}

.diagram-card {
    padding: 16px 18px;
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    background: var(--color-white);
    transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.diagram-card:hover {
    border-color: var(--color-gray-300);
    box-shadow: var(--shadow-sm);
    transform: translateY(-1px);
}

.diagram-card.active {
    border-color: var(--color-primary);
    background: rgba(59, 111, 232, 0.04);
    box-shadow: 0 0 0 1px var(--color-primary-glow);
}

.diagram-card-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
}

.diagram-card-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-gray-800);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    letter-spacing: -0.01em;
}

.diagram-card-badge {
    font-size: 10px;
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 999px;
    flex-shrink: 0;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.diagram-card-badge.owner {
    background: rgba(59, 111, 232, 0.1);
    color: var(--color-primary);
}

.diagram-card-badge.viewer {
    background: rgba(107, 92, 231, 0.1);
    color: var(--layer-analysis-accent);
}

.diagram-card-meta {
    font-size: 12px;
    color: var(--color-gray-400);
    margin-bottom: 10px;
    font-weight: 300;
}

.diagram-card-actions {
    display: flex;
    gap: 6px;
}

.diagram-card-btn {
    padding: 6px 14px;
    font-size: 12px;
    font-weight: 500;
    font-family: inherit;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-gray-200);
    background: var(--color-white);
    color: var(--color-gray-600);
    cursor: pointer;
    transition: all 0.2s ease;
    letter-spacing: -0.01em;
}

.diagram-card-btn:hover {
    background: var(--color-gray-50);
    border-color: var(--color-gray-300);
}

.diagram-card-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.diagram-card-btn.delete-btn:hover {
    background: #FEE2E2;
    border-color: #FCA5A5;
    color: #DC2626;
}

.diagram-card-btn.open-btn:hover {
    background: var(--color-primary);
    color: var(--color-white);
    border-color: var(--color-primary);
    box-shadow: 0 2px 8px var(--color-primary-glow);
}

/* Auth required banner */
.auth-required-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--layer-sources);
    border-bottom: 2px solid var(--layer-sources-border);
    padding: 12px 24px;
    text-align: center;
    font-size: 13px;
    font-weight: 500;
    color: var(--layer-sources-accent);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.auth-banner-btn {
    padding: 6px 14px;
    font-size: 12px;
    font-weight: 600;
    font-family: inherit;
    border-radius: var(--radius-sm);
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    letter-spacing: -0.01em;
}

.auth-banner-login {
    background: var(--color-primary);
    color: var(--color-white);
}

.auth-banner-login:hover {
    background: var(--color-primary-hover);
    box-shadow: 0 4px 12px var(--color-primary-glow);
}

.auth-banner-dismiss {
    background: transparent;
    color: var(--layer-sources-accent);
    border: 1px solid var(--layer-sources-border);
}

.auth-banner-dismiss:hover {
    background: rgba(200, 155, 24, 0.15);
}

/* Toast Notifications */
.toast-container {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 20000;
    display: flex;
    flex-direction: column-reverse;
    align-items: center;
    gap: 8px;
    pointer-events: none;
}

.toast {
    padding: 10px 22px;
    background: var(--color-gray-900);
    color: var(--color-gray-50);
    font-size: 13px;
    font-weight: 500;
    border-radius: 999px;
    box-shadow: 0 8px 24px rgba(20, 18, 16, 0.25);
    opacity: 0;
    transform: translateY(8px);
    transition: opacity 0.25s ease, transform 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    pointer-events: auto;
    letter-spacing: -0.01em;
}

.toast.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Confirm Dialog */
.confirm-dialog {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(20, 18, 16, 0.5);
    backdrop-filter: blur(4px);
    z-index: 10000;
    padding: 16px;
}

.confirm-dialog[hidden] {
    display: none;
}

.confirm-dialog__content {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    max-width: 380px;
    width: 100%;
    box-shadow: var(--shadow-xl);
    padding: 28px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    animation: dialogSlideIn 0.25s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.confirm-dialog__title {
    font-family: var(--font-family);
    font-size: 16px;
    font-weight: 600;
    color: var(--color-gray-900);
    margin: 0;
    letter-spacing: -0.02em;
}

.confirm-dialog__message {
    font-size: 14px;
    color: var(--color-gray-500);
    margin: 0;
    line-height: 1.6;
    font-weight: 300;
}

.confirm-dialog__actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 16px;
}

.confirm-dialog__btn {
    padding: 8px 18px;
    font-size: 13px;
    font-weight: 500;
    font-family: inherit;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    letter-spacing: -0.01em;
}

.confirm-dialog__btn--cancel {
    background: var(--color-gray-100);
    color: var(--color-gray-700);
}

.confirm-dialog__btn--cancel:hover {
    background: var(--color-gray-200);
}

.confirm-dialog__btn--confirm {
    background: #DC2626;
    color: var(--color-white);
}

.confirm-dialog__btn--confirm:hover {
    background: #B91C1C;
    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.25);
}

/* Responsive adjustments */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 240px;
    }
}

@media (max-width: 768px) {
    :root {
        --canvas-width: 100%;
    }

    .app-body {
        flex-direction: column;
        height: auto;
    }

    .sidebar {
        width: 100%;
        height: auto;
        max-height: 200px;
        border-right: none;
        border-bottom: 1px solid var(--sidebar-border);
    }

    .component-list {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 8px;
    }

    .component-item {
        flex: 0 0 auto;
    }

    .canvas-container {
        padding: 16px;
        height: auto;
        max-height: none;
    }

    .diagram-header {
        width: 100%;
        align-items: flex-start;
        flex-direction: column;
    }

    .diagram-title {
        font-size: 24px;
        width: 100%;
    }

    .diagram-last-edited {
        width: 100%;
        text-align: left;
    }

    .canvas {
        padding: 16px;
    }

    .layer {
        min-height: 100px;
    }

    .layer-label {
        font-size: 9px;
    }

    .header-actions .btn {
        padding: 6px 12px;
        font-size: 13px;
    }
}