frontend/styles.css

/* GraphLLM Stylesheet - Dark Sleek Theme */

/* ========== CSS Reset & Base Styles ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
    width: 100%;
    overflow-x: hidden;
}

:root {
    /* Color Palette */
    --bg-primary: #0f1115;
    --bg-secondary: #12151a;
    --bg-card: #1a1d24;
    --bg-hover: #23262e;

    --text-primary: #e6eef8;
    --text-secondary: #cfd8e3;
    --text-muted: #8b92a0;

    --accent-primary: #4f9eff;
    --accent-hover: #3d8ae6;
    --accent-glow: rgba(79, 158, 255, 0.3);

    --success: #4caf50;
    --warning: #ff9800;
    --danger: #f44336;

    --border-color: #2a2f3a;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);

    /* Graph Node Colors */
    --node-concept: #4f9eff;
    --node-function: #9c27b0;
    --node-class: #ff5722;
    --node-term: #4caf50;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

/* ========== Typography ========== */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

code, pre {
    font-family: 'Consolas', 'Monaco', 'Courier New', monospace;
    background-color: var(--bg-secondary);
    padding: 0.2em 0.4em;
    border-radius: var(--radius-sm);
}

/* ========== Layout ========== */
body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.app-header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-lg) var(--spacing-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
}

.header-content {
    flex: 1;
}

.app-title {
    margin: 0;
    font-size: 1.75rem;
    background: linear-gradient(135deg, var(--accent-primary), #9c27b0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.app-subtitle {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin: 0;
}

.header-controls {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.upload-section {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

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

/* Main Container */
.main-container {
    flex: 1;
    display: grid;
    grid-template-columns: 65% 35%;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    overflow: hidden;
    height: calc(100vh - 180px); /* Account for header and footer */
    max-height: calc(100vh - 180px);
}

/* ========== Graph Pane (Left) ========== */
.graph-pane {
    background-color: var(--bg-card);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-md);
    overflow: hidden;
    height: 100%;
    max-height: 100%;
}

.pane-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.pane-header h2 {
    margin: 0;
    font-size: 1.25rem;
}

.graph-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.graph-container {
    flex: 1;
    background-color: var(--bg-secondary);
    border-radius: var(--radius-sm);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border-color);
    min-height: 500px;
    height: 100%;
    width: 100%;
}

.graph-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    text-align: center;
    padding: var(--spacing-xl);
}

.graph-placeholder p {
    margin: var(--spacing-sm) 0;
}

.help-text {
    font-size: 0.875rem;
    color: var(--text-muted);
    opacity: 0.7;
}

/* Graph Legend */
.graph-legend {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

.graph-legend h3 {
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-secondary);
}

.legend-items {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    border: 2px solid currentColor;
}

.legend-color.concept { color: var(--node-concept); }
.legend-color.function { color: var(--node-function); }
.legend-color.class { color: var(--node-class); }
.legend-color.term { color: var(--node-term); }

/* ========== Detail Pane (Right) ========== */
.detail-pane {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    overflow-y: auto;
    overflow-x: hidden;
    height: 100%;
    max-height: 100%;
    padding-right: var(--spacing-sm);  /* Space for scrollbar */
}

.card {
    background-color: var(--bg-card);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    width: 100%;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.card-header h2 {
    margin: 0;
    font-size: 1.25rem;
}

/* Node Detail Card */
.node-detail {
    flex-shrink: 0;  /* Never shrink - always show full content */
    overflow-y: visible;  /* Don't scroll the card itself */
    display: block;
    margin-bottom: var(--spacing-lg);
}

.node-content {
    color: var(--text-secondary);
    max-height: none;  /* No height restriction */
}

.placeholder-text {
    color: var(--text-muted);
    text-align: center;
    padding: var(--spacing-xl);
}

.node-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    width: 100%;
    padding-bottom: var(--spacing-lg);
}

.node-label {
    font-size: 1.5rem;
    color: var(--accent-primary);
    margin-bottom: var(--spacing-xs);
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    background-color: var(--accent-primary);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-right: var(--spacing-sm);
}

.node-importance {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.node-summary, .node-sources, .related-nodes {
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent-primary);
    margin-bottom: var(--spacing-md);
}

.node-summary p {
    line-height: 1.7;
    color: var(--text-secondary);
}

.expand-toggle {
    background: none;
    border: none;
    color: var(--accent-primary);
    cursor: pointer;
    font-size: 0.875rem;
    padding: var(--spacing-xs) 0;
    transition: color var(--transition-fast);
}

.expand-toggle:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

.sources-list, .related-list {
    list-style: none;
    margin-top: var(--spacing-sm);
}

.sources-list li, .related-list li {
    padding: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
    background-color: var(--bg-hover);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
}

/* Chat Section */
.chat-section {
    flex: 0 1 auto;  /* Can shrink but don't grow */
    display: flex;
    flex-direction: column;
    min-height: 300px;
    height: 400px;  /* Fixed height */
}

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

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-md);
    min-height: 200px;
}

.message {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--radius-sm);
    line-height: 1.6;
}

.message.user {
    background-color: var(--accent-primary);
    color: white;
    align-self: flex-end;
    max-width: 80%;
    margin-left: auto;
}

.message.assistant {
    background-color: var(--bg-hover);
    color: var(--text-primary);
    border-left: 3px solid var(--accent-primary);
}

.message.system {
    background-color: transparent;
    color: var(--text-muted);
    font-size: 0.875rem;
    text-align: center;
    border: none;
}

.chat-input-area {
    display: flex;
    gap: var(--spacing-sm);
}

.chat-input {
    flex: 1;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    resize: vertical;
    transition: border-color var(--transition-fast);
}

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

/* ========== Buttons ========== */
.btn {
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

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

.btn-primary:hover {
    background-color: var(--accent-hover);
    box-shadow: 0 0 12px var(--accent-glow);
}

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

.btn-secondary:hover {
    background-color: var(--bg-card);
}

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

.btn-danger:hover {
    background-color: #d32f2f;
}

.icon-btn {
    width: 36px;
    height: 36px;
    padding: 0;
    background-color: var(--bg-hover);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 1.2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.icon-btn:hover {
    background-color: var(--bg-card);
    border-color: var(--accent-primary);
}

/* ========== Footer ========== */
.app-footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md) var(--spacing-xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.stats {
    display: flex;
    gap: var(--spacing-lg);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

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

/* ========== Responsive Design ========== */
@media (max-width: 1024px) {
    .main-container {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto;
    }

    .graph-pane {
        min-height: 400px;
    }
}

@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }

    .header-controls {
        width: 100%;
        flex-wrap: wrap;
    }

    .main-container {
        padding: var(--spacing-sm);
        gap: var(--spacing-sm);
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }

    .stats {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

/* ========== Accessibility ========== */
/* Focus styles for keyboard navigation */
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

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

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ========== Graph Node Styles (for JS visualization) ========== */
/* These classes will be used by the graph visualization library */
.graph-node {
    cursor: pointer;
    transition: all var(--transition-fast);
}

.graph-node.concept circle { fill: var(--node-concept); }
.graph-node.function circle { fill: var(--node-function); }
.graph-node.class circle { fill: var(--node-class); }
.graph-node.term circle { fill: var(--node-term); }

.graph-node:hover circle {
    stroke-width: 3px;
    filter: brightness(1.2);
}

.graph-node.selected circle {
    stroke: var(--accent-primary);
    stroke-width: 4px;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 0 0 0 var(--accent-glow);
    }
    50% {
        box-shadow: 0 0 0 10px rgba(79, 158, 255, 0);
    }
}

.graph-edge {
    stroke: var(--text-muted);
    stroke-width: 1.5px;
    fill: none;
    opacity: 0.6;
}

.graph-edge.highlighted {
    stroke: var(--accent-primary);
    opacity: 1;
    stroke-width: 2px;
}

/* Vis.js Network Canvas Constraints */
.graph-container canvas {
    max-width: 100% !important;
    max-height: 100% !important;
}

.graph-container > div {
    width: 100% !important;
    height: 100% !important;
    max-height: 100% !important;
}

/* ========== Processing Overlay ========== */
.processing-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 17, 21, 0.95);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
    animation: fadeIn 0.3s ease-in-out;
}

.processing-overlay[hidden] {
    display: none;
}

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

.processing-modal {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 3rem 4rem;
    box-shadow: var(--shadow-lg);
    text-align: center;
    min-width: 400px;
    animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(30px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Spinner Animation */
.spinner {
    width: 80px;
    height: 80px;
    margin: 0 auto 2rem;
    border: 6px solid var(--border-color);
    border-top: 6px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

#processing-title {
    color: var(--text-primary);
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

#processing-message {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 1.5rem;
    min-height: 1.5rem;
}

/* Progress Bar */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-secondary);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-hover));
    border-radius: 4px;
    transition: width 0.3s ease-out;
    width: 0%;
    box-shadow: 0 0 10px var(--accent-glow);
}

.processing-percent {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.5px;
}