/* CSS Variables */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --surface-hover: #334155;
    --border-color: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --success-color: #22c55e;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --cycle-color: #f43f5e;
    --node-color: #6366f1;
    --node-hover: #818cf8;
    --edge-color: #475569;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

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

/* Base Styles */
html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 1.5rem;
}

.header-content {
    max-width: 1800px;
    margin: 0 auto;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* Main Content */
.main-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Controls Panel */
.controls-panel {
    width: 320px;
    min-width: 320px;
    background-color: var(--surface-color);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.control-section {
    background-color: var(--background-color);
    border-radius: var(--radius-md);
    padding: 1rem;
    border: 1px solid var(--border-color);
}

.control-section h2 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

/* Import Options */
.import-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.file-upload {
    position: relative;
}

.file-upload input[type="file"] {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.file-label {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background-color: var(--surface-color);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.file-label:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    background-color: var(--surface-hover);
}

.divider {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    position: relative;
}

.divider::before,
.divider::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 40%;
    height: 1px;
    background-color: var(--border-color);
}

.divider::before {
    left: 0;
}

.divider::after {
    right: 0;
}

.paste-html {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.paste-html textarea {
    width: 100%;
    height: 120px;
    padding: 0.75rem;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: 'Monaco', 'Menlo', 'Consolas', monospace;
    font-size: 0.8125rem;
    resize: vertical;
    transition: border-color var(--transition-fast);
}

.paste-html textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.paste-html textarea::placeholder {
    color: var(--text-muted);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

.btn-secondary {
    background-color: var(--surface-color);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

/* Filter Controls */
.filter-controls {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.search-input {
    width: 100%;
    padding: 0.625rem 0.875rem;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.875rem;
    transition: border-color var(--transition-fast);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.search-input::placeholder {
    color: var(--text-muted);
}

.filter-options {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--primary-color);
    cursor: pointer;
}

/* Export Controls */
.export-controls {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.export-controls .btn {
    width: 100%;
}

/* Statistics */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0.5rem;
    background-color: var(--surface-color);
    border-radius: var(--radius-md);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 0.6875rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

/* Component List */
.component-list {
    max-height: 200px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.component-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.5rem 0.75rem;
    background-color: var(--surface-color);
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.component-item:hover {
    background-color: var(--surface-hover);
}

.component-item.selected {
    background-color: var(--primary-color);
    color: white;
}

.component-item.has-cycle {
    border-left: 3px solid var(--cycle-color);
}

.component-deps {
    font-size: 0.75rem;
    color: var(--text-muted);
    background-color: var(--background-color);
    padding: 0.125rem 0.5rem;
    border-radius: 9999px;
}

.component-item.selected .component-deps {
    background-color: rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.9);
}

/* Graph Container */
.graph-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

/* Graph Toolbar */
.graph-toolbar {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5rem;
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
}

.toolbar-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.toolbar-btn:hover {
    background-color: var(--surface-hover);
    color: var(--text-primary);
    border-color: var(--border-color);
}

.toolbar-separator {
    width: 1px;
    height: 24px;
    background-color: var(--border-color);
    margin: 0 0.25rem;
}

/* Graph Area */
.graph-area {
    flex: 1;
    position: relative;
    overflow: hidden;
    background-color: var(--background-color);
    background-image:
        radial-gradient(circle, var(--border-color) 1px, transparent 1px);
    background-size: 20px 20px;
}

.graph-svg {
    width: 100%;
    height: 100%;
    display: block;
}

/* Empty State */
.empty-state {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    color: var(--text-muted);
}

.empty-state svg {
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.empty-state p {
    font-size: 0.875rem;
    max-width: 300px;
}

.empty-state.hidden {
    display: none;
}

/* Tooltip */
.tooltip {
    position: absolute;
    padding: 0.75rem 1rem;
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    font-size: 0.8125rem;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-fast);
    z-index: 1000;
    max-width: 300px;
}

.tooltip.visible {
    opacity: 1;
}

.tooltip-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.tooltip-content {
    color: var(--text-secondary);
}

.tooltip-deps {
    margin-top: 0.5rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border-color);
}

.tooltip-deps-title {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 0.25rem;
}

.tooltip-deps-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
}

.tooltip-dep-tag {
    padding: 0.125rem 0.5rem;
    background-color: var(--background-color);
    border-radius: 9999px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Footer */
.footer {
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 1rem;
    text-align: center;
}

.footer p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.footer a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal.visible {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--surface-color);
    border-radius: var(--radius-lg);
    width: 90%;
    max-width: 500px;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
}

.modal-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background-color: var(--surface-hover);
    color: var(--text-primary);
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    max-height: calc(80vh - 60px);
}

.cycle-item {
    padding: 0.75rem;
    background-color: var(--background-color);
    border-radius: var(--radius-md);
    margin-bottom: 0.75rem;
    border-left: 3px solid var(--cycle-color);
}

.cycle-item:last-child {
    margin-bottom: 0;
}

.cycle-path {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.875rem;
}

.cycle-node {
    padding: 0.25rem 0.5rem;
    background-color: var(--surface-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
}

.cycle-arrow {
    color: var(--cycle-color);
    font-weight: bold;
}

/* SVG Graph Styles */
.node {
    cursor: pointer;
}

.node circle {
    fill: var(--node-color);
    stroke: var(--primary-hover);
    stroke-width: 2px;
    transition: all var(--transition-fast);
}

.node:hover circle {
    fill: var(--node-hover);
    stroke-width: 3px;
}

.node.selected circle {
    fill: var(--warning-color);
    stroke: #d97706;
}

.node.cycle circle {
    fill: var(--cycle-color);
    stroke: #be123c;
}

.node text {
    fill: var(--text-primary);
    font-size: 12px;
    font-weight: 500;
    pointer-events: none;
    text-anchor: middle;
}

.edge {
    fill: none;
    stroke: var(--edge-color);
    stroke-width: 1.5px;
    transition: all var(--transition-fast);
}

.edge.highlighted {
    stroke: var(--primary-color);
    stroke-width: 2.5px;
}

.edge.cycle {
    stroke: var(--cycle-color);
    stroke-width: 2px;
    stroke-dasharray: 5, 3;
}

.edge-arrow {
    fill: var(--edge-color);
}

.edge.highlighted .edge-arrow,
.edge-arrow.highlighted {
    fill: var(--primary-color);
}

.edge.cycle .edge-arrow,
.edge-arrow.cycle {
    fill: var(--cycle-color);
}

/* Mobile Responsive */
@media (max-width: 1024px) {
    .main-content {
        flex-direction: column;
    }

    .controls-panel {
        width: 100%;
        min-width: 100%;
        max-height: 50vh;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .graph-container {
        min-height: 50vh;
    }
}

@media (max-width: 768px) {
    .header {
        padding: 0.75rem 1rem;
    }

    .header h1 {
        font-size: 1.25rem;
    }

    .controls-panel {
        padding: 0.75rem;
        gap: 0.75rem;
    }

    .control-section {
        padding: 0.75rem;
    }

    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .stat-value {
        font-size: 1.25rem;
    }

    .export-controls {
        flex-direction: row;
    }

    .export-controls .btn {
        flex: 1;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1rem;
    }

    .subtitle {
        font-size: 0.75rem;
    }

    .control-section h2 {
        font-size: 0.75rem;
    }

    .btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.8125rem;
    }

    .export-controls {
        flex-direction: column;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background-color);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* Animation */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}