:root {
    /* Bitcoin Data Labs Dark Theme Variables */
    --bdl-header-bg: #0B0E14;
    --bdl-header-bg-compressed: #0B0E14;
    --bdl-subnav-bg: #131A26;

    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --bg-primary: #0B0E14;
    --bg-secondary: #131A26;
    --accent: #E8916B;
    --bitcoin-orange: #E8916B;
    --border: rgba(255, 255, 255, 0.08);
    --card-bg: #161B22;
    --surface: #1a1a1a;

    /* Theme Colors for Network Categories */
    --color-consensus: #ef4444;
    --color-script: #f59e0b;
    --color-l2: #10b981;
    --color-privacy: #8b5cf6;
    --color-wallet: #3b82f6;
    --color-mempool: #ec4899;
    --color-network: #06b6d4;
    --color-mining: #71717a;
    --color-other: #444;
}

/* Global Reset & Base */
html,
body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
}

/* App Layout */
#main-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

#header,
#footer {
    flex-shrink: 0;
}

#app-content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

#graph-container {
    flex: 1;
    position: relative;
    background-color: var(--bg-primary);
}

#sidebar {
    width: 360px;
    background-color: var(--bg-secondary);
    border-left: 1px solid var(--border);
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
    z-index: 10;
}

/* Header & Sidebar Typography */
.sidebar-header h1 {
    font-size: 18px;
    font-weight: 700;
    margin: 0;
    color: var(--bitcoin-orange);
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-header p {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 8px 0 0 0;
    line-height: 1.5;
}

/* Components: Filter Groups & Buttons */
.filter-group {
    background: var(--card-bg);
    padding: 16px;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.filter-label {
    font-size: 11px;
    font-weight: 700;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 12px;
    display: block;
}

.btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.theme-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
}

.filter-btn {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border);
    padding: 8px 12px;
    color: var(--text-secondary);
    border-radius: 6px;
    font-size: 11px;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
    flex: 1;
    min-width: 80px;
}

.filter-btn:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    border-color: rgba(255, 255, 255, 0.2);
}

.filter-btn.active {
    background: var(--bitcoin-orange);
    color: #000;
    border-color: var(--bitcoin-orange);
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(247, 147, 26, 0.2);
}

/* HUD & Overlays */
.hud {
    position: absolute;
    top: 24px;
    left: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 5;
}

.search-container {
    position: relative;
}

#search-input,
#bip-search {
    width: 220px;
    padding: 12px 16px;
    background: rgba(11, 14, 20, 0.85);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 13px;
    outline: none;
    transition: all 0.2s;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

#search-input:focus,
#bip-search:focus {
    border-color: var(--bitcoin-orange);
    background: rgba(11, 14, 20, 0.95);
    width: 260px;
}

.stats-hud {
    background: rgba(11, 14, 20, 0.85);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px 18px;
    color: var(--text-secondary);
    font-size: 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    min-width: 200px;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    gap: 20px;
}

.stat-val {
    font-weight: 700;
    color: #fff;
}

.stat-val.highlight {
    color: var(--bitcoin-orange);
}

/* Map Controls */
.controls {
    position: absolute;
    top: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 5;
}

.control-btn {
    background: rgba(11, 14, 20, 0.85);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border);
    padding: 10px;
    color: var(--text-primary);
    border-radius: 10px;
    cursor: pointer;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.control-btn:hover {
    background: var(--card-bg);
    border-color: rgba(255, 255, 255, 0.2);
    transform: scale(1.05);
}

/* Tooltip */
.tooltip {
    position: absolute;
    background: rgba(11, 14, 20, 0.98);
    border: 1px solid var(--border);
    padding: 16px;
    border-radius: 12px;
    font-size: 12px;
    pointer-events: none;
    z-index: 100;
    color: var(--text-primary);
    display: none;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    min-width: 200px;
}

/* D3 Graph Styles */
svg#viz {
    width: 100%;
    height: 100%;
}

line.link {
    stroke-opacity: 0.15;
    transition: stroke-opacity 0.2s, stroke-width 0.2s;
}

circle.node {
    transition: r 0.3s, fill 0.3s, stroke 0.2s;
    stroke-width: 0.5px;
    cursor: pointer;
}

text.label {
    fill: #fff;
    font-size: 9px;
    font-weight: 500;
    pointer-events: none;
    opacity: 0.6;
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.8);
}

/* Selection Panel / Profile */
.info-panel {
    background: var(--card-bg);
    padding: 24px;
    border-radius: 16px;
    border: 1px solid var(--border);
    border-left: 4px solid var(--bitcoin-orange);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.info-title {
    font-size: 15px;
    font-weight: 800;
    margin-bottom: 20px;
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.expertise-meter {
    display: flex;
    height: 10px;
    border-radius: 5px;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.05);
    margin: 8px 0 16px 0;
}

.expertise-segment {
    height: 100%;
}

.bip-chip {
    display: inline-block;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 10px;
    font-weight: 600;
    margin-right: 6px;
    margin-bottom: 6px;
    color: var(--text-secondary);
    transition: all 0.2s;
}

.bip-chip:hover {
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
}

.info-item {
    font-size: 13px;
    margin-bottom: 8px;
    display: flex;
    justify-content: space-between;
}

.info-label {
    color: var(--text-secondary);
}

.info-val {
    color: #fff;
    font-weight: 600;
}

.expertise-label {
    font-size: 10px;
    color: var(--text-secondary);
    margin-top: 16px;
    margin-bottom: 4px;
    display: block;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
}

.tag {
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 10px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.tag-delving {
    background: rgba(139, 190, 220, 0.15);
    color: #8BBEDC;
    border: 1px solid rgba(139, 190, 220, 0.3);
}

.tag-ml {
    background: rgba(232, 145, 107, 0.15);
    color: #E8916B;
    border: 1px solid rgba(232, 145, 107, 0.3);
}

.tag-mixed {
    background: rgba(240, 240, 240, 0.1);
    color: #f0f0f0;
    border: 1px solid rgba(240, 240, 240, 0.2);
}

/* Scrollbar Styles */
#sidebar::-webkit-scrollbar {
    width: 6px;
}

#sidebar::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

#sidebar::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

#sidebar::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Shared Header Overrides */
#header .app-header {
    border-bottom: 1px solid var(--border) !important;
}

#header .nav-link.active {
    color: var(--bitcoin-orange) !important;
}