/* ===== CSS Variables / Theme ===== */
:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-hover: #30363d;
    --border-color: #30363d;
    --border-subtle: #21262d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --accent: #58a6ff;
    --accent-hover: #79c0ff;
    --link-color: #2f81f7;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    --radius: 8px;
    --radius-sm: 4px;
    --radius-lg: 12px;
    --transition: 200ms ease;
    --header-height: 56px;
    --filter-width: 220px;
    --sidebar-width: 340px;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Company colors */
    --c-openai: #10A37F;
    --c-meta: #0668E1;
    --c-google: #FBBC04;
    --c-anthropic: #D4A574;
    --c-mistral: #F7931A;
    --c-microsoft: #00BCF2;
    --c-alibaba: #FF6A00;
    --c-deepseek: #4A90D9;
    --c-stabilityai: #A855F7;
    --c-huggingface: #FFD21E;
    --c-stanford: #8C1515;
    --c-lmsys: #6366F1;
    --c-berkeley: #003262;
    --c-compvis: #009CDE;
    --c-runway: #FF4081;
    --c-bfl: #2D5016;
    --c-answerai: #22C55E;
}

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

html, body {
    height: 100%;
    overflow: hidden;
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* ===== Header ===== */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
    position: relative;
}

.header-left { display: flex; align-items: center; gap: 12px; }
.logo { display: flex; align-items: center; gap: 8px; font-size: 18px; font-weight: 700; }
.logo-icon { font-size: 22px; }
.logo-text { background: linear-gradient(135deg, #22c55e, #10a37f); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.header-meta { font-size: 12px; color: var(--text-muted); white-space: nowrap; }

.header-center { flex: 1; max-width: 480px; margin: 0 24px; }

.search-container { position: relative; }
.search-input {
    width: 100%;
    height: 36px;
    padding: 0 12px 0 36px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 13px;
    outline: none;
    transition: border-color var(--transition);
}
.search-input:focus { border-color: var(--accent); }
.search-input::placeholder { color: var(--text-muted); }
.search-icon {
    position: absolute;
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    color: var(--text-muted);
    pointer-events: none;
}

.search-results {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    margin-top: 4px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    max-height: 320px;
    overflow-y: auto;
    z-index: 200;
}
.search-results.active { display: block; }
.search-result-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    cursor: pointer;
    transition: background var(--transition);
}
.search-result-item:hover, .search-result-item.active { background: var(--bg-hover); }
.search-result-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.search-result-name { font-weight: 500; color: var(--text-primary); }
.search-result-company { font-size: 12px; color: var(--text-muted); margin-left: auto; }

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

.view-toggle { display: flex; background: var(--bg-primary); border: 1px solid var(--border-color); border-radius: var(--radius); overflow: hidden; }
.view-btn {
    display: flex; align-items: center; justify-content: center;
    width: 36px; height: 32px;
    background: none; border: none; color: var(--text-muted);
    cursor: pointer; transition: all var(--transition);
}
.view-btn svg { width: 16px; height: 16px; }
.view-btn:hover { color: var(--text-primary); background: var(--bg-hover); }
.view-btn.active { color: var(--accent); background: var(--bg-tertiary); }

.github-link {
    display: flex; align-items: center; justify-content: center;
    width: 36px; height: 36px; color: var(--text-secondary);
    transition: color var(--transition);
}
.github-link:hover { color: var(--text-primary); }
.github-link svg { width: 22px; height: 22px; }

/* ===== Main Layout ===== */
.main {
    display: flex;
    height: calc(100vh - var(--header-height));
    overflow: hidden;
}

/* ===== Filter Panel ===== */
.filter-panel {
    width: var(--filter-width);
    min-width: var(--filter-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    padding: 16px;
    flex-shrink: 0;
}

.filter-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}
.filter-header h2 { font-size: 14px; font-weight: 600; }
.filter-reset {
    font-size: 11px;
    color: var(--accent);
    background: none;
    border: none;
    cursor: pointer;
    font-family: var(--font-sans);
}
.filter-reset:hover { color: var(--accent-hover); text-decoration: underline; }

.filter-section { margin-bottom: 20px; }
.filter-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.filter-options { display: flex; flex-direction: column; gap: 2px; }
.filter-option {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 6px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition);
    font-size: 13px;
}
.filter-option:hover { background: var(--bg-hover); }
.filter-option input[type="checkbox"] { accent-color: var(--accent); cursor: pointer; }
.filter-option .color-dot {
    width: 10px; height: 10px; border-radius: 50%; flex-shrink: 0;
}
.filter-option label { cursor: pointer; flex: 1; color: var(--text-primary); }
.filter-option .count { font-size: 11px; color: var(--text-muted); }

.range-input {
    width: 100%;
    accent-color: var(--accent);
    cursor: pointer;
}
.range-labels { display: flex; justify-content: space-between; font-size: 11px; color: var(--text-muted); margin-top: 4px; }

/* ===== Visualization Container ===== */
.viz-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    background: var(--bg-primary);
    /* Subtle grid pattern */
    background-image:
        radial-gradient(circle, var(--border-subtle) 1px, transparent 1px);
    background-size: 24px 24px;
}

#tree-svg {
    width: 100%;
    height: 100%;
    cursor: grab;
}
#tree-svg:active { cursor: grabbing; }

.viz-controls {
    position: absolute;
    top: 12px;
    right: 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    z-index: 10;
}
.viz-btn {
    display: flex; align-items: center; justify-content: center;
    width: 32px; height: 32px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
}
.viz-btn:hover { background: var(--bg-hover); color: var(--text-primary); }
.viz-btn svg { width: 16px; height: 16px; }
.viz-separator { height: 1px; background: var(--border-color); margin: 2px 0; }

/* ===== Node & Link Styles ===== */
.link {
    fill: none;
    stroke-linecap: round;
    transition: stroke-opacity 0.3s ease;
}
.link.dimmed { stroke-opacity: 0.08 !important; }
.link.highlighted { stroke-opacity: 0.9 !important; stroke-width: 3 !important; }
.link.fine-tune { stroke-dasharray: 6 4; }

.node { transition: opacity 0.3s ease; }
.node.dimmed { opacity: 0.15; }
.node.selected .node-outer {
    stroke-opacity: 1 !important;
    stroke-width: 3.5 !important;
}
.node.selected .node-glow {
    opacity: 0.35 !important;
}

/* ===== Tooltip ===== */
.tooltip {
    display: none;
    position: absolute;
    padding: 12px 16px;
    background: rgba(22, 27, 34, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(48, 54, 61, 0.8);
    border-radius: 10px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255,255,255,0.05);
    max-width: 300px;
    pointer-events: none;
    z-index: 50;
    font-size: 12px;
}
.tooltip.active { display: block; animation: tooltipIn 0.15s ease-out; }
@keyframes tooltipIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }
.tooltip-header { margin-bottom: 8px; }
.tooltip-name { font-weight: 600; font-family: var(--font-mono); font-size: 14px; margin-bottom: 3px; color: #fff; }
.tooltip-company { font-size: 12px; margin-bottom: 2px; }
.tooltip-meta { display: flex; flex-wrap: wrap; gap: 6px; }
.tooltip-tag {
    display: inline-block;
    padding: 2px 8px;
    background: rgba(110, 118, 129, 0.15);
    border: 1px solid rgba(110, 118, 129, 0.2);
    border-radius: 12px;
    font-size: 11px;
    color: var(--text-secondary);
    font-family: var(--font-mono);
}

/* ===== Detail Sidebar ===== */
.detail-sidebar {
    width: 0;
    min-width: 0;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    overflow-y: auto;
    overflow-x: hidden;
    transition: width 300ms ease, min-width 300ms ease;
    position: relative;
}
.detail-sidebar.open {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
}

.sidebar-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 28px;
    height: 28px;
    display: flex; align-items: center; justify-content: center;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    z-index: 2;
    transition: all var(--transition);
}
.sidebar-close:hover { background: var(--bg-hover); color: var(--text-primary); }
.sidebar-close svg { width: 14px; height: 14px; }

.sidebar-content { padding: 16px; min-width: calc(var(--sidebar-width) - 2px); }

.sidebar-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    color: var(--text-muted);
    font-size: 13px;
    text-align: center;
}

.model-header { margin-bottom: 16px; }
.model-name {
    font-family: var(--font-mono);
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 6px;
    line-height: 1.3;
}
.model-company-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    margin-bottom: 8px;
}
.model-company-dot { width: 8px; height: 8px; border-radius: 50%; }

.model-meta-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 16px;
}
.meta-item { min-width: 0; }
.meta-label { font-size: 10px; text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-muted); margin-bottom: 2px; }
.meta-value { font-size: 13px; font-weight: 500; color: var(--text-primary); }
.meta-value.mono { font-family: var(--font-mono); font-size: 12px; }

.model-description {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-subtle);
}

.model-significance {
    font-size: 12px;
    color: var(--accent);
    padding: 8px 12px;
    background: rgba(88, 166, 255, 0.08);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--accent);
    margin-bottom: 16px;
}

.model-links { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
.model-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 5px 10px;
    font-size: 12px;
    color: var(--accent);
    background: rgba(88, 166, 255, 0.08);
    border: 1px solid rgba(88, 166, 255, 0.2);
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all var(--transition);
}
.model-link:hover { background: rgba(88, 166, 255, 0.15); }

.model-relations { margin-top: 16px; }
.relations-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}
.relation-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 8px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition);
    font-size: 12px;
}
.relation-item:hover { background: var(--bg-hover); }
.relation-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.relation-name { font-family: var(--font-mono); font-weight: 500; }
.relation-type { color: var(--text-muted); margin-left: auto; font-size: 11px; }

/* ===== Legend ===== */
.legend {
    position: absolute;
    bottom: 12px;
    left: calc(var(--filter-width) + 12px);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 11px;
    z-index: 10;
    min-width: 200px;
}
.legend-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    font-weight: 600;
    cursor: pointer;
}
.legend-toggle {
    background: none; border: none; color: var(--text-muted);
    cursor: pointer; font-size: 10px; transition: transform var(--transition);
}
.legend-body { padding: 0 12px 10px; }
.legend-body.collapsed { display: none; }
.legend-toggle.collapsed { transform: rotate(-90deg); }
.legend-section { margin-bottom: 8px; }
.legend-section:last-child { margin-bottom: 0; }
.legend-label { color: var(--text-muted); display: block; margin-bottom: 4px; }
.legend-items { display: flex; flex-wrap: wrap; gap: 10px; }
.legend-item { display: flex; align-items: center; gap: 4px; color: var(--text-secondary); }
.legend-line { display: inline-block; width: 20px; height: 2px; }
.legend-line.solid { background: var(--text-secondary); }
.legend-line.dashed { background: repeating-linear-gradient(90deg, var(--text-secondary) 0, var(--text-secondary) 4px, transparent 4px, transparent 7px); }
.legend-line.dotted { background: repeating-linear-gradient(90deg, var(--text-secondary) 0, var(--text-secondary) 2px, transparent 2px, transparent 5px); }
.legend-border { display: inline-block; width: 14px; height: 14px; border-radius: 50%; }
.legend-border.solid-border { border: 2px solid var(--text-secondary); }
.legend-border.dashed-border { border: 2px dashed var(--text-secondary); }
.legend-border.dotted-border { border: 2px dotted var(--text-secondary); }

/* ===== D3 Tree Overrides ===== */
.link.base { stroke-linecap: round; }
.link.finetune,
.link.fine-tune { stroke-dasharray: 6 3; }
.link.distillation { stroke-dasharray: 2 3; }
.link.architecture { opacity: 0.35; }
.link.merge { stroke-dasharray: 4 2; }
.link.inspiration { stroke-dasharray: 8 4; opacity: 0.3; }
.link.multimodal-extension { stroke-dasharray: 5 3; }
.link.quantization { stroke-dasharray: 1 3; opacity: 0.3; }

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg-hover); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ===== Responsive ===== */
@media (max-width: 1200px) {
    .filter-panel { display: none; }
    .legend { left: 12px; }
}
@media (max-width: 768px) {
    .header-meta { display: none; }
    .header-center { margin: 0 8px; }
    .detail-sidebar.open {
        position: absolute;
        right: 0;
        top: 0;
        height: 100%;
        z-index: 50;
    }
    .legend { bottom: 8px; left: 8px; }
    .view-toggle { display: none; }
}