:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-panel: #ffffff;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent-primary: #6366f1;
    --accent-hover: #4f46e5;
    --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #d946ef);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5 {
    font-family: 'Outfit', sans-serif;
    letter-spacing: -0.02em;
}

.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 240px;
    background-color: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 1.5rem 0;
    position: fixed;
    height: 100vh;
    z-index: 100;
}

.logo {
    padding: 0 1.5rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.logo h2 {
    font-size: 1.3rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-top: 0.25rem;
}

.nav-links {
    list-style: none;
    margin-top: 1.5rem;
    padding: 0 0.75rem;
}

.nav-links li {
    padding: 0.75rem 1rem;
    margin-bottom: 0.25rem;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-links li:hover {
    background-color: #f1f5f9;
    color: var(--text-primary);
}

.nav-links li.active {
    background-color: #eef2ff;
    color: var(--accent-primary);
    border-left: 3px solid var(--accent-primary);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 240px;
    padding: 2rem 2.5rem;
    display: flex;
    flex-direction: column;
}

.tab-header {
    margin-bottom: 2rem;
}

.tab-header h1 {
    font-size: 2rem;
    margin-bottom: 0.4rem;
    color: var(--text-primary);
}

.tab-header p {
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 700px;
}

/* Panels */
.glass-panel {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}

/* Tab 1 Layout */
.tab1-grid {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 1.5rem;
    height: 68vh;
    min-height: 500px;
}

/* Topics Panel */
.topics-panel {
    display: flex;
    flex-direction: column;
    overflow: hidden;
    height: 100%;
}

.search-box {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.search-box input {
    width: 100%;
    background: #f8fafc;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    transition: border-color 0.2s;
    outline: none;
}

.search-box input::placeholder {
    color: #94a3b8;
}

.search-box input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.08);
}

.topic-list {
    flex: 1;
    overflow-y: auto;
    padding: 0.5rem;
}

.topic-list::-webkit-scrollbar {
    width: 4px;
}
.topic-list::-webkit-scrollbar-track {
    background: transparent;
}
.topic-list::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

.topic-item {
    padding: 0.875rem 1rem;
    margin-bottom: 0.25rem;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.15s;
    border: 1px solid transparent;
}

.topic-item:hover {
    background: #f8fafc;
}

.topic-item.selected {
    background: #eef2ff;
    border-color: #c7d2fe;
}

.topic-item h4 {
    color: var(--text-primary);
    margin-bottom: 0.2rem;
    font-size: 0.9rem;
}

.topic-item p {
    color: var(--text-secondary);
    font-size: 0.78rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.topic-badge {
    display: inline-block;
    background: #f1f5f9;
    color: var(--text-secondary);
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 4px;
    margin-right: 4px;
}

/* Details Panel */
.details-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    overflow-y: auto;
    height: 100%;
}

.visualizations-section {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
}

.viz-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.viz-tab {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 0.45rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
    font-size: 0.83rem;
    transition: all 0.15s;
}

.viz-tab:hover {
    background: #f1f5f9;
    color: var(--text-primary);
}

.viz-tab.active {
    background: var(--accent-primary);
    color: #fff;
    border-color: transparent;
}

.viz-container {
    flex: 1;
    background: #fff;
    border-radius: 8px;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border-color);
}

.viz-container iframe {
    width: 100%;
    height: 500px;
    border: none;
    background: #fff;
    display: block;
    overflow: hidden;
}

.viz-container img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.viz-external-link {
    margin-top: 0.75rem;
    text-align: right;
}

.btn-primary {
    background: var(--accent-primary);
    color: #fff;
    border: none;
    padding: 0.7rem 1.4rem;
    border-radius: 8px;
    font-family: 'Outfit', sans-serif;
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: background 0.15s, transform 0.15s;
}

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}

.btn-primary.full-width {
    width: 100%;
    text-align: center;
}

.topic-info-section {
    padding: 1.75rem;
}

.topic-info-section h2 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.keywords-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 1.5rem;
}

.keyword-tag {
    background: #eef2ff;
    color: var(--accent-primary);
    border: 1px solid #c7d2fe;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.82rem;
}

.representative-docs h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.doc-card {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    padding: 1.25rem;
    border-radius: 8px;
    margin-bottom: 0.75rem;
    font-size: 0.88rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.doc-card strong {
    color: var(--text-primary);
}

/* Tab 2 Layout */
.inference-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    padding: 1.5rem;
    min-height: 500px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    width: 100%;
}

.input-group label, .input-section label {
    font-family: 'Outfit', sans-serif;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.input-section textarea, .input-group textarea {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 1rem 1.1rem;
    border-radius: 8px;
    font-family: 'Inter', sans-serif;
    font-size: 0.9rem;
    line-height: 1.6;
    resize: vertical;
    transition: border-color 0.2s;
    outline: none;
}

.input-section textarea:focus, .input-group textarea:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.08);
    background: #fff;
}

textarea::placeholder {
    color: #94a3b8;
    font-style: italic;
}

.results-section {
    display: flex;
    flex-direction: column;
    background: #f8fafc;
    border-radius: 8px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.results-section h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.output-box {
    flex: 1;
    overflow-y: auto;
}

.placeholder-text {
    color: var(--text-secondary);
    font-style: italic;
    opacity: 0.7;
}

/* Loader Animation */
.loader {
    width: 40px;
    height: 40px;
    border: 2px solid #e2e8f0;
    border-radius: 50%;
    border-top-color: var(--accent-primary);
    animation: spin 0.8s ease-in-out infinite;
    margin: 2rem auto;
}

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

.result-data {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.result-item {
    background: #f8fafc;
    padding: 1rem 1.25rem;
    border-radius: 8px;
    border-left: 3px solid var(--accent-primary);
}

.result-item .label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

.result-item .value {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 600;
}

/* --- Project Story & Narrative --- */
.project-story {
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.story-section {
    width: 100%;
}

.story-section h2 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.story-section p {
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.phase-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1rem;
    margin-top: 1.25rem;
}

.phase-card {
    padding: 1.25rem 1.5rem;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.phase-card .phase-num {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--accent-primary);
    margin-bottom: 0.4rem;
}

.phase-card h3 {
    margin-bottom: 0.6rem;
    font-size: 1rem;
    color: var(--text-primary);
}

.phase-card ul {
    list-style: none;
    font-size: 0.87rem;
    color: var(--text-secondary);
}

.phase-card li {
    margin-bottom: 0.4rem;
    position: relative;
    padding-left: 1.1rem;
}

.phase-card li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--accent-primary);
}

/* Architecture Diagram */
.architecture-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 1.75rem;
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-top: 1.5rem;
}

.architecture-container h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.arch-node {
    padding: 0.65rem 1.5rem;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: 'Inter', sans-serif;
    font-size: 0.88rem;
    color: var(--text-primary);
    text-align: center;
    min-width: 220px;
}

.arch-node.accent {
    border-color: #c7d2fe;
    background: #eef2ff;
    color: var(--accent-primary);
    font-weight: 500;
}

.arch-arrow {
    width: 2px;
    height: 16px;
    background: #cbd5e1;
}

/* Comparison View */
.comparison-view {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 1.5rem;
    width: 100%;
}

.comparison-pane {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    min-width: 0;
    overflow: hidden;
}

.comparison-pane h4 {
    text-align: center;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
}

.comparison-pane .viz-container {
    width: 100%;
    aspect-ratio: 1100 / 750;
    position: relative;
    overflow: hidden;
}

.comparison-pane .viz-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    transform-origin: top left;
    border: none;
    display: block;
}

.external-viz-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 0.5rem 1rem;
    background: #1e293b;
    border: 1px solid #1e293b;
    border-radius: 6px;
    color: #ffffff;
    text-decoration: none;
    font-size: 0.82rem;
    font-weight: 600;
    transition: all 0.15s;
    width: fit-content;
    align-self: center;
}

.external-viz-btn:hover {
    background: #0f172a;
    border-color: #0f172a;
    color: #ffffff;
}

/* --- Mobile Responsiveness --- */
@media (max-width: 900px) {
    .app-container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        position: relative;
        flex-direction: column;
        padding: 1rem;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .logo {
        padding: 0 0 1rem 0;
        text-align: center;
    }

    .nav-links {
        display: flex;
        justify-content: center;
        gap: 8px;
        margin-top: 0;
        padding: 0;
    }

    .nav-links li {
        margin-bottom: 0;
        padding: 0.5rem 0.875rem;
        font-size: 0.85rem;
    }

    .main-content {
        margin-left: 0;
        padding: 1.25rem 1rem;
    }

    .tab1-grid {
        grid-template-columns: 1fr;
        height: auto;
        min-height: unset;
    }

    .topics-panel {
        height: 320px;
    }

    .details-panel {
        height: 500px;
        overflow-y: auto;
    }

    .visualizations-section {
        height: auto;
    }

    .viz-container iframe {
        height: 450px;
    }

    .inference-layout {
        grid-template-columns: 1fr;
        padding: 1rem;
    }
}

/* Tab 2 Specific */
.inference-grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.feature-card {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    padding: 1.5rem;
}

.card-header {
    display: flex;
    align-items: center;
    gap: 0.875rem;
}

.card-header h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 0.15rem;
}

.small-text {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.icon-circle {
    width: 38px;
    height: 38px;
    background: #eef2ff;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
    flex-shrink: 0;
}

.action-footer {
    display: flex;
    justify-content: flex-start;
}

/* Comparison Bridge */
.comparison-bridge {
    display: flex;
    align-items: stretch;
    gap: 0.75rem;
}

.vs-badge {
    align-self: center;
    background: #f1f5f9;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    font-weight: 800;
    flex-shrink: 0;
}

.comparison-bridge .input-group {
    flex: 1;
    min-width: 0;
}

.comparison-bridge textarea {
    height: 160px;
}

.full-height-input textarea {
    height: 160px;
}

/* Radial Score Chart */
.comparison-result-card {
    padding: 1.25rem;
    background: #f8fafc;
    border-radius: 10px;
    border: 1px dashed #c7d2fe;
}

.result-score-wrap {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.score-circle-container {
    width: 90px;
    position: relative;
    flex-shrink: 0;
}

.circular-chart {
    display: block;
    max-width: 100%;
}

.circle-bg {
    fill: none;
    stroke: #e2e8f0;
    stroke-width: 2.8;
}

.circle {
    fill: none;
    stroke-width: 2.8;
    stroke-linecap: round;
    stroke: var(--accent-primary);
    transition: stroke-dasharray 1s ease-in-out;
}

.score-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.score-text span {
    display: block;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.score-text small {
    font-size: 0.6rem;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.score-info h4 {
    font-size: 1rem;
    color: var(--text-primary);
    margin-bottom: 0.35rem;
}

.score-info p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* Inference Results Grid */
.results-container {
    margin-top: 0.5rem;
}

.results-main-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.result-summary, .viz-panel {
    padding: 1.5rem;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    padding-bottom: 0.875rem;
    border-bottom: 1px solid var(--border-color);
}

.panel-header h3 {
    font-size: 1.05rem;
    color: var(--text-primary);
}

.status-badge {
    background: #dcfce7;
    color: #16a34a;
    font-size: 0.68rem;
    padding: 3px 10px;
    border-radius: 20px;
    text-transform: uppercase;
    font-weight: 600;
}

.viz-placeholder {
    background: #f8fafc;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 0.88rem;
}

/* Animation */
.fade-in {
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 1200px) {
.neighbor-job-item {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 0.5rem;
    overflow: hidden;
}

.neighbor-job-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.65rem 0.9rem;
    cursor: pointer;
    user-select: none;
    background: var(--bg-secondary);
    transition: background 0.15s;
}

.neighbor-job-header:hover {
    background: #eef2ff;
}

.neighbor-chevron {
    font-size: 0.7rem;
    color: var(--text-secondary);
    transition: transform 0.2s;
    flex-shrink: 0;
}

.neighbor-job-body {
    display: none;
    padding: 0.8rem 0.9rem;
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--text-secondary);
    white-space: pre-wrap;
    border-top: 1px solid var(--border-color);
    max-height: 260px;
    overflow-y: auto;
}

    .inference-grid, .results-main-grid {
        grid-template-columns: 1fr;
    }
    .comparison-bridge {
        flex-direction: column;
    }
    .vs-badge {
        display: none;
    }
}