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

:root {
    /* Colors */
    --color-primary: #1E61DC;
    --color-primary-hover: #1752C4;
    --color-bg: #F5F7FA;
    --color-white: #FFFFFF;
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;

    /* Layer colors - subtle, professional palette */
    --layer-marketing: #E0F2FE;
    --layer-marketing-border: #7DD3FC;
    --layer-experiences: #FCE7F3;
    --layer-experiences-border: #F9A8D4;
    --layer-sources: #FEF3C7;
    --layer-sources-border: #FCD34D;
    --layer-analysis: #E0E7FF;
    --layer-analysis-border: #A5B4FC;
    --layer-activation: #D1FAE5;
    --layer-activation-border: #6EE7B7;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    
    /* Spacing */
    --header-height: 64px;
    --sidebar-width: 260px;
    --canvas-padding: 40px;
    --layer-gap: 16px;
    --layer-min-height: 120px;
    --slot-columns: 6;
    --model-picker-gap: 20px;
    --model-picker-height: 72px;
    --model-picker-space: calc(var(--model-picker-gap) + var(--model-picker-height));
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-gray-800);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 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 24px;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo-text {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-gray-900);
}

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

/* Buttons */
.btn {
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all 0.15s ease;
    font-family: inherit;
}

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

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

.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 */
.sidebar {
    width: var(--sidebar-width);
    background: var(--color-white);
    border-right: 1px solid var(--color-gray-200);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    flex-shrink: 0;
    min-height: 0;
    max-height: 100vh;
}

.sidebar-section {
    padding: 16px;
    flex: 1;
    overflow-y: auto;
    min-height: 0;
}

/* Category Picker */
.category-picker {
    display: flex;
    justify-content: center;
    gap: 4px;
    padding: 12px;
    border-bottom: 1px solid var(--color-gray-200);
    background: var(--color-gray-50);
}

.category-tab {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--color-white);
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.15s ease;
    color: var(--color-gray-500);
}

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

.category-tab.active {
    color: var(--color-white);
}

/* Category-specific active colors */
.category-tab[data-category="marketing"].active {
    background: #0EA5E9;
    border-color: #0EA5E9;
}

.category-tab[data-category="experiences"].active {
    background: #EC4899;
    border-color: #EC4899;
}

.category-tab[data-category="sources"].active {
    background: #F59E0B;
    border-color: #F59E0B;
}

.category-tab[data-category="analysis"].active {
    background: #8B5CF6;
    border-color: #8B5CF6;
}

.category-tab[data-category="activation"].active {
    background: #10B981;
    border-color: #10B981;
}

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

/* Component List */
.component-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.component-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.15s ease;
    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: var(--shadow-md);
}

.component-icon {
    width: 36px;
    height: 36px;
    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: #0284C7;
}

.component-icon.category-experiences {
    background: var(--layer-experiences);
    color: #DB2777;
}

.component-icon.category-sources {
    background: var(--layer-sources);
    color: #D97706;
}

.component-icon.category-analysis {
    background: var(--layer-analysis);
    color: #6366F1;
}

.component-icon.category-activation {
    background: var(--layer-activation);
    color: #059669;
}

.component-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-gray-700);
}

/* 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 */
.add-custom {
    padding: 12px 16px;
    border-top: 1px solid var(--color-gray-200);
    background: var(--color-white);
}

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

.add-custom-input {
    flex: 1;
    padding: 10px 12px;
    font-size: 14px;
    font-family: inherit;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    background: var(--color-white);
    color: var(--color-gray-800);
    transition: all 0.15s ease;
}

.add-custom-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(30, 97, 220, 0.1);
}

.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 0.15s ease;
    flex-shrink: 0;
}

.add-custom-btn:hover {
    background: var(--color-primary-hover);
}

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

/* Canvas Container */
.canvas-container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: stretch;
    padding: clamp(12px, 2vw, var(--canvas-padding));
    overflow: auto;
    min-height: 0;
    max-height: 100vh;
    height: 100vh;
    position: relative;
}

.canvas {
    width: 1200px;
    min-width: 1200px;
    max-width: 1200px;
    flex: 0 0 1200px;
    height: 758px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: clamp(20px, 2vw, 32px);
    display: flex;
    flex-direction: column;
    gap: var(--layer-gap);
    min-height: 0;
    position: relative;
}

.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;
}

.export-btn-floating {
    width: 56px;
    height: 56px;
    border-radius: 999px;
    border: none;
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: 0 12px 30px rgba(30, 97, 220, 0.35);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.export-btn-floating:hover {
    background: var(--color-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 16px 32px rgba(23, 82, 196, 0.45);
}

.export-btn-floating:active {
    transform: translateY(0) scale(0.97);
    box-shadow: 0 10px 24px rgba(23, 82, 196, 0.4);
}

.export-btn-floating svg {
    pointer-events: none;
    stroke: currentColor;
}

/* Layers */
.layer {
    min-height: var(--layer-min-height);
    flex: 1 1 var(--layer-min-height);
    border-radius: var(--radius-md);
    border: 2px dashed;
    display: flex;
    flex-direction: column;
    position: relative;
    transition: all 0.2s ease;
}

.layer:hover {
    box-shadow: var(--shadow-md);
}

.layer-label {
    position: absolute;
    left: 16px;
    top: 12px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-gray-600);
    background: inherit;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}

.layer-content {
    flex: 1;
    padding: 48px 24px 24px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: var(--layer-gap);
    justify-items: stretch;
    align-items: start;
    position: relative;
}

.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 0.15s ease;
}

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

.slot-guide-ghost {
    border: 2px dashed rgba(14, 165, 233, 0.45);
    border-radius: var(--radius-lg);
    background: rgba(14, 165, 233, 0.08);
    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: 2px solid var(--color-gray-300);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    cursor: default;
    position: relative;
    z-index: 2;
    transition: all 0.2s ease;
}

.diagram-node:hover {
    box-shadow: var(--shadow-md);
}

.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: #0284C7;
}

.node-icon.category-experiences {
    background: var(--layer-experiences);
    color: #DB2777;
}

.node-icon.category-sources {
    background: var(--layer-sources);
    color: #D97706;
}

.node-icon.category-analysis {
    background: var(--layer-analysis);
    color: #6366F1;
}

.node-icon.category-activation {
    background: var(--layer-activation);
    color: #059669;
}

.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;
}

.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 0.15s 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: #E2E8F0;
    color: #475569;
    font-size: 9px;
    font-weight: 600;
    padding: 1px 6px;
    border-radius: 999px;
    cursor: pointer;
    transition: all 0.15s ease;
    display: none;
    pointer-events: none;
}

.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: #CBD5F5;
}

.node-badge.active {
    background: #0EA5E9;
    color: #FFFFFF;
    box-shadow: 0 2px 6px rgba(14, 165, 233, 0.35);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    pointer-events: auto;
}

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

.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: 1px solid var(--color-gray-300);
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    transition: all 0.15s ease;
    color: var(--color-gray-500);
}

.node-remove:hover {
    background: #FEE2E2;
    border-color: #FCA5A5;
    color: #DC2626;
}

.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: 1px solid var(--color-gray-300);
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    transition: all 0.15s 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);
}

.diagram-node.pending-connection {
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.3);
}

.layer-content.drag-over {
    border-style: solid;
    border-color: var(--color-primary);
    background: rgba(14, 165, 233, 0.05);
}

/* Node animations */
.diagram-node.entering {
    opacity: 0;
    transform: scale(0.8);
}

.diagram-node.removing {
    animation: nodeRemove 0.25s ease forwards;
}

.diagram-node.highlight {
    animation: nodeHighlight 0.6s ease;
}

@keyframes nodeRemove {
    to {
        opacity: 0;
        transform: scale(0.8);
    }
}

@keyframes nodeHighlight {
    0%, 100% {
        box-shadow: var(--shadow-sm);
    }
    50% {
        box-shadow: 0 0 0 4px rgba(30, 97, 220, 0.3);
    }
}

/* Sidebar item added state */
.component-item.added {
    background: var(--color-gray-100);
    opacity: 0.6;
}

.component-item.added::after {
    content: '✓';
    margin-left: auto;
    color: var(--color-primary);
    font-weight: 600;
}

/* 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: 13px;
    font-style: italic;
}

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

.adjacency-highlight {
    position: absolute;
    border: 2px solid rgba(148, 163, 184, 0.85);
    background: rgba(226, 232, 240, 0.45);
    border-radius: 18px;
    box-shadow: 0 10px 26px rgba(15, 23, 42, 0.16);
}

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

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

.connection-layer .connection-label {
    font-size: 10px;
    font-style: italic;
    font-weight: 400;
    letter-spacing: 0.2px;
    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;
}

/* Model picker */
.model-picker {
    position: fixed;
    left: 50%;
    bottom: 24px;
    transform: translateX(-50%);
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    padding: 12px 16px;
    border: 1px solid var(--color-gray-200);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 10px 30px rgba(15, 23, 42, 0.15);
    z-index: 150;
    max-width: calc(100% - 32px);
}

.model-option {
    padding: 8px 14px;
    border-radius: 999px;
    border: 1px solid var(--color-gray-300);
    background: var(--color-white);
    color: var(--color-gray-700);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s ease;
    white-space: nowrap;
}

.model-option:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.model-option.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
    box-shadow: 0 5px 15px rgba(30, 97, 220, 0.25);
}

/* Responsive adjustments */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 220px;
    }
}

@media (max-width: 768px) {
    .app-body {
        flex-direction: column;
        height: auto;
    }

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

    .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;
    }

    .canvas {
        padding: 16px;
    }

    .layer {
        min-height: 100px;
    }

    .layer-label {
        font-size: 11px;
    }

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