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

:root {
    --bg-dark: #0A0E17;
    --bg-card: #121824;
    --bg-card-hover: #182030;
    --bg-terminal: #07090F;
    --border-color: rgba(255, 255, 255, 0.08);
    --border-color-hover: rgba(255, 255, 255, 0.15);
    
    --color-primary: #3B82F6; /* Blue */
    --color-primary-glow: rgba(59, 130, 246, 0.2);
    --color-success: #10B981; /* Emerald */
    --color-success-glow: rgba(16, 185, 129, 0.2);
    --color-danger: #EF4444; /* Rose */
    --color-danger-glow: rgba(239, 68, 68, 0.2);
    --color-warning: #F59E0B; /* Amber */
    
    --text-primary: #F3F4F6;
    --text-secondary: #9CA3AF;
    --text-muted: #6B7280;
    
    --font-ui: 'Inter', sans-serif;
    --font-header: 'Outfit', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --sidebar-width: 400px;
    --transition-speed: 0.25s;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    font-family: var(--font-ui);
    overflow: hidden;
    height: 100vh;
}

/* App Layout */
.app-container {
    display: flex;
    flex-direction: row;
    width: 100vw;
    height: 100vh;
}

/* Main Visualizer Canvas Area (75%) */
.main-content {
    flex: 1;
    position: relative;
    height: 100%;
    overflow: hidden;
    background: radial-gradient(circle at center, #101626 0%, var(--bg-dark) 100%);
}

#tree-container {
    width: 100%;
    height: 100%;
    position: relative;
    cursor: grab;
}

#tree-container:active {
    cursor: grabbing;
}

/* Sidebar HUD Panel (25%) */
.sidebar {
    width: var(--sidebar-width);
    min-width: 350px;
    height: 100%;
    background-color: var(--bg-card);
    border-left: 1px solid var(--border-color);
    box-shadow: -4px 0 25px rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    padding: 1.5rem;
    gap: 1.25rem;
    z-index: 10;
}

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

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

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--color-primary);
    filter: drop-shadow(0 0 8px var(--color-primary-glow));
}

.logo-container h1 {
    font-family: var(--font-header);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, #FFF 0%, #93C5FD 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* HUD Panels / Cards */
.panel {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    transition: border-color var(--transition-speed);
}

.panel:hover {
    border-color: var(--border-color-hover);
}

.panel-title {
    font-family: var(--font-header);
    font-size: 0.95rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
    border-left: 3px solid var(--color-primary);
    padding-left: 0.5rem;
    line-height: 1.2;
}

/* Inspector Details styling */
.empty-state {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 1.5rem 0;
    border: 1px dashed var(--border-color);
    border-radius: 8px;
}

.hidden {
    display: none !important;
}

.info-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.info-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.info-label {
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--text-muted);
    letter-spacing: 0.07em;
    text-transform: uppercase;
}

.info-value {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
}

.font-mono {
    font-family: var(--font-mono);
}

.highlight-text {
    font-weight: 700;
    color: var(--color-primary);
}

.text-sm {
    font-size: 0.85rem;
}

.text-xs {
    font-size: 0.75rem;
}

.status-badge {
    align-self: flex-start;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
}

.status-badge.status-available {
    border-color: var(--text-muted);
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.02);
}

.status-badge.status-allocated {
    border-color: var(--color-success);
    color: var(--color-success);
    background: var(--color-success-glow);
}

.status-badge.status-split {
    border-color: var(--color-primary);
    color: var(--color-primary);
    background: var(--color-primary-glow);
}

/* Actions and Form Elements */
.actions-container {
    margin-top: 0.5rem;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}

.action-block {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.input-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.input-group {
    display: flex;
    gap: 0.5rem;
}

.input-group-vertical {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-select, .form-input {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    padding: 0.5rem 0.75rem;
    font-size: 0.9rem;
    outline: none;
    transition: border-color var(--transition-speed);
}

.form-select {
    flex: 1;
    cursor: pointer;
}

.form-select:focus, .form-input:focus {
    border-color: var(--color-primary);
}

.btn {
    border: none;
    border-radius: 6px;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: background-color var(--transition-speed), transform 0.1s, box-shadow var(--transition-speed);
    font-family: var(--font-ui);
}

.btn:active {
    transform: scale(0.98);
}

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

.btn-primary:hover {
    background-color: #2563EB;
    box-shadow: 0 0 12px var(--color-primary-glow);
}

.btn-accent {
    background-color: #4F46E5; /* Indigo */
    color: white;
}

.btn-accent:hover {
    background-color: #4338CA;
    box-shadow: 0 0 12px rgba(79, 70, 229, 0.3);
}

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

.btn-danger:hover {
    background-color: #DC2626;
    box-shadow: 0 0 12px var(--color-danger-glow);
}

.btn-full {
    width: 100%;
}

.btn-icon {
    width: 16px;
    height: 16px;
}

.help-text {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 1.3;
}

.text-warning {
    color: var(--color-warning);
}

/* Slider styling */
.slider-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

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

.form-slider {
    width: 100%;
    -webkit-appearance: none;
    background: rgba(255, 255, 255, 0.1);
    height: 6px;
    border-radius: 3px;
    outline: none;
}

.form-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    box-shadow: 0 0 8px var(--color-primary-glow);
    transition: background var(--transition-speed);
}

.form-slider::-webkit-slider-thumb:hover {
    background: #60A5FA;
}

/* Retro Terminal */
.terminal-container {
    background-color: var(--bg-terminal);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.8);
}

.terminal-header {
    background-color: rgba(255, 255, 255, 0.03);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.terminal-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.terminal-dot.red { background-color: #EF4444; }
.terminal-dot.yellow { background-color: #F59E0B; }
.terminal-dot.green { background-color: #10B981; }

.terminal-title {
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-left: 0.5rem;
    flex-grow: 1;
}

.btn-clear {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.7rem;
    cursor: pointer;
    font-family: var(--font-ui);
}

.btn-clear:hover {
    color: var(--text-secondary);
}

.terminal-body {
    padding: 0.75rem;
    font-size: 0.75rem;
    height: 140px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    scroll-behavior: smooth;
    line-height: 1.4;
}

.terminal-line {
    word-break: break-all;
}

.terminal-line.system-msg {
    color: var(--text-muted);
}

.terminal-line.info-msg {
    color: #60A5FA;
}

.terminal-line.success-msg {
    color: var(--color-success);
    font-weight: 500;
}

.terminal-line.error-msg {
    color: var(--color-danger);
    font-weight: 500;
}

.terminal-line.route-msg {
    color: #A78BFA; /* Purple */
}

/* Custom Scrollbar for Sidebar & Terminal */
.sidebar::-webkit-scrollbar,
.terminal-body::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track,
.terminal-body::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
}

.terminal-body::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover,
.terminal-body::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Legend styling */
.legend-grid {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 4px;
    display: inline-block;
}

.legend-color.node-split {
    background-color: #1E293B;
    border: 1px solid var(--color-primary);
}

.legend-color.node-allocated {
    background-color: #064E3B;
    border: 1px solid var(--color-success);
}

.legend-color.node-available {
    background-color: #0F172A;
    border: 1px solid var(--text-muted);
}

.legend-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Navigation HUD Overlay on D3 */
.canvas-instructions {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: rgba(18, 24, 36, 0.8);
    backdrop-filter: blur(8px);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 30px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 1rem;
    pointer-events: auto;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.btn-reset-view {
    background: var(--color-primary);
    border: none;
    border-radius: 20px;
    color: white;
    padding: 0.2rem 0.6rem;
    font-size: 0.7rem;
    font-weight: 600;
    cursor: pointer;
    font-family: var(--font-ui);
}

.btn-reset-view:hover {
    background: #2563EB;
}

/* D3 SVG Visual Styling */
svg {
    width: 100%;
    height: 100%;
}

.link {
    fill: none;
    stroke: #334155;
    stroke-width: 2px;
    transition: stroke var(--transition-speed), stroke-width var(--transition-speed);
}

.link.active-route {
    stroke: var(--color-primary);
    stroke-width: 3.5px;
    filter: drop-shadow(0 0 4px var(--color-primary-glow));
}

.link.success-route {
    stroke: var(--color-success);
    stroke-width: 3.5px;
    filter: drop-shadow(0 0 4px var(--color-success-glow));
}

.link.dropped-route {
    stroke: var(--color-danger);
    stroke-width: 3.5px;
    filter: drop-shadow(0 0 4px var(--color-danger-glow));
}

/* Visual Node Cards in D3 */
.node {
    cursor: pointer;
}

.node-rect {
    fill: #0F172A;
    stroke: var(--text-muted);
    stroke-width: 1.5px;
    rx: 8px;
    ry: 8px;
    transition: fill var(--transition-speed), stroke var(--transition-speed), stroke-width var(--transition-speed), filter var(--transition-speed);
}

.node.allocated .node-rect {
    fill: #064E3B;
    stroke: var(--color-success);
}

.node.split .node-rect {
    fill: #1E293B;
    stroke: var(--color-primary);
}

.node.selected .node-rect {
    stroke-width: 3px;
    filter: drop-shadow(0 0 10px rgba(255, 255, 255, 0.15));
}

.node.selected.allocated .node-rect {
    stroke-width: 3px;
    filter: drop-shadow(0 0 10px var(--color-success-glow));
}

.node.selected.split .node-rect {
    stroke-width: 3px;
    filter: drop-shadow(0 0 10px var(--color-primary-glow));
}

.node:hover .node-rect {
    stroke-width: 2.5px;
}

.node.allocated:hover .node-rect {
    stroke: #34D399;
}

.node.split:hover .node-rect {
    stroke: #60A5FA;
}

.node.available:hover .node-rect {
    stroke: var(--text-secondary);
}

/* Node Text Styles */
.node-text-cidr {
    font-family: var(--font-mono);
    font-size: 11px;
    font-weight: 700;
    fill: var(--text-primary);
}

.node-text-status {
    font-family: var(--font-ui);
    font-size: 9px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.node.allocated .node-text-status {
    fill: #A7F3D0; /* Light green */
}

.node.split .node-text-status {
    fill: #BFDBFE; /* Light blue */
}

.node.available .node-text-status {
    fill: var(--text-muted);
}

.node-text-hosts {
    font-family: var(--font-mono);
    font-size: 9px;
    fill: var(--text-secondary);
}

/* Packet Animation Element */
.packet-marker {
    fill: #60A5FA;
    filter: drop-shadow(0 0 8px #60A5FA);
}

.packet-marker.success {
    fill: var(--color-success);
    filter: drop-shadow(0 0 8px var(--color-success));
}

.packet-marker.dropped {
    fill: var(--color-danger);
    filter: drop-shadow(0 0 8px var(--color-danger));
}

/* Keyframes & Classes for Dynamic Simulation Ripples */
@keyframes pulse-success {
    0% {
        r: 10px;
        opacity: 0.8;
        stroke-width: 1px;
    }
    100% {
        r: 35px;
        opacity: 0;
        stroke-width: 3px;
    }
}

.pulse-success-circle {
    fill: none;
    stroke: var(--color-success);
    pointer-events: none;
    animation: pulse-success 0.8s ease-out 2;
}

@keyframes pulse-dropped {
    0% {
        r: 10px;
        opacity: 0.8;
        stroke-width: 1px;
    }
    100% {
        r: 35px;
        opacity: 0;
        stroke-width: 3px;
    }
}

.pulse-dropped-circle {
    fill: none;
    stroke: var(--color-danger);
    pointer-events: none;
    animation: pulse-dropped 0.8s ease-out 2;
}

/* Active Packets HUD List Styles */
.active-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 160px;
    overflow-y: auto;
    padding-right: 2px;
}

.packet-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.5rem 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.packet-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.15);
}

.packet-item.selected {
    background: rgba(59, 130, 246, 0.08);
    border-color: var(--color-primary);
    box-shadow: 0 0 8px rgba(59, 130, 246, 0.15);
}

.packet-item-info {
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
}

.packet-item-id {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
}

.packet-item-dest {
    font-size: 0.65rem;
    color: var(--text-secondary);
}

.packet-status-badge {
    font-size: 0.6rem;
    font-weight: 700;
    padding: 0.1rem 0.35rem;
    border-radius: 3px;
    text-transform: uppercase;
}

.packet-status-badge.running {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.packet-status-badge.paused {
    background: rgba(245, 158, 11, 0.1);
    color: var(--color-warning);
    border: 1px solid rgba(245, 158, 11, 0.2);
}

/* Active Controls Deck */
.active-controls-deck {
    margin-top: 0.5rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.selected-packet-info {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.packet-name {
    color: var(--color-primary);
    font-weight: 700;
}

.control-buttons {
    display: flex;
    gap: 0.5rem;
    width: 100%;
}

.flex-1 {
    flex: 1;
}

.btn-sm {
    padding: 0.35rem 0.75rem;
    font-size: 0.8rem;
}

/* Selected packet route path glow on D3 Canvas */
.link.packet-selected-route {
    stroke: #60A5FA;
    stroke-width: 4.5px;
    filter: drop-shadow(0 0 6px rgba(96, 165, 250, 0.6));
}

.packet-marker.packet-selected-marker {
    r: 9px;
    stroke: #FFFFFF;
    stroke-width: 1.5px;
    filter: drop-shadow(0 0 10px #60A5FA);
}

/* Flow Color Variable Palette (8 Theme Variations) */
.flow-color-1 { --flow-color: #3b82f6; --flow-glow: rgba(59, 130, 246, 0.4); } /* Blue */
.flow-color-2 { --flow-color: #10b981; --flow-glow: rgba(16, 185, 129, 0.4); } /* Green */
.flow-color-3 { --flow-color: #8b5cf6; --flow-glow: rgba(139, 92, 246, 0.4); } /* Lavender */
.flow-color-4 { --flow-color: #f97316; --flow-glow: rgba(249, 115, 22, 0.4); } /* Orange */
.flow-color-5 { --flow-color: #ec4899; --flow-glow: rgba(236, 72, 153, 0.4); } /* Magenta/Pink */
.flow-color-6 { --flow-color: #06b6d4; --flow-glow: rgba(6, 182, 212, 0.4); } /* Cyan/Teal */
.flow-color-7 { --flow-color: #f43f5e; --flow-glow: rgba(244, 63, 94, 0.4); } /* Rose/Pink-Red */
.flow-color-8 { --flow-color: #fbbf24; --flow-glow: rgba(251, 191, 38, 0.4); } /* Gold/Yellow */

/* Dynamic Flow Styling Connectors */
.link.active-route.flow-style {
    stroke: var(--flow-color) !important;
    filter: drop-shadow(0 0 5px var(--flow-glow)) !important;
}

.packet-marker.flow-style {
    fill: var(--flow-color) !important;
    filter: drop-shadow(0 0 8px var(--flow-color)) !important;
}

.packet-item.flow-style {
    border-left: 4px solid var(--flow-color) !important;
}

/* Specific glows when a flow is actively highlighted */
.link.packet-selected-route.flow-style {
    stroke-width: 5.5px !important;
    filter: drop-shadow(0 0 8px var(--flow-color)) !important;
}

.packet-marker.packet-selected-marker.flow-style {
    r: 9.5px !important;
    stroke: #FFFFFF !important;
    stroke-width: 1.5px !important;
    filter: drop-shadow(0 0 12px var(--flow-color)) !important;
}

/* Ports HUD Panel styling */
.ports-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
    margin-top: 0.5rem;
    margin-bottom: 0.75rem;
}

.port-slot {
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.4rem 0.2rem;
    text-align: center;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.15rem;
    transition: background-color var(--transition-speed), border-color var(--transition-speed), transform 0.1s;
}

.port-slot:hover {
    background: rgba(255, 255, 255, 0.04);
    border-color: rgba(255, 255, 255, 0.15);
}

.port-slot.selected {
    border-color: var(--color-primary);
    background: rgba(59, 130, 246, 0.08);
    box-shadow: 0 0 6px rgba(59, 130, 246, 0.2);
}

.port-slot:active {
    transform: scale(0.95);
}

.port-num {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.port-status-indicator {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background-color: var(--text-muted);
}

.port-slot.status-subnet .port-status-indicator {
    background-color: var(--color-success);
    box-shadow: 0 0 4px var(--color-success-glow);
}

.port-slot.status-router .port-status-indicator {
    background-color: var(--color-primary);
    box-shadow: 0 0 4px var(--color-primary-glow);
}

/* Port Configuration Deck & Radio Styles */
.port-config-deck {
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    padding: 0.75rem;
    margin-top: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
}

.config-deck-title {
    font-family: var(--font-header);
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3rem;
    margin-bottom: 0.25rem;
}

.form-group-vertical {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.radio-group {
    display: flex;
    gap: 1rem;
    margin-top: 0.15rem;
}

.radio-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.35rem;
    cursor: pointer;
}

.radio-label input[type="radio"] {
    cursor: pointer;
    accent-color: var(--color-primary);
}

/* Link Port Labels styling on D3 Canvas */
.link-label-bg {
    fill: var(--bg-dark);
    stroke: var(--border-color);
    stroke-width: 0.5px;
    rx: 3px;
    ry: 3px;
}

.link-label-text {
    font-family: var(--font-mono);
    font-size: 9px;
    font-weight: 700;
    fill: var(--text-secondary);
    text-anchor: middle;
    dominant-baseline: middle;
    user-select: none;
}

/* Simulator controls grid spacing */
.simulator-controls {
    display: flex;
    flex-direction: column;
    gap: 1.15rem;
    margin-top: 0.5rem;
}

/* Detailed View Right-Side HUD Panel */
.detailed-hud {
    position: absolute;
    top: 5rem;
    right: 1.5rem;
    width: 270px;
    background: rgba(15, 23, 42, 0.88);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    z-index: 100;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
    color: var(--text-primary);
    transition: opacity var(--transition-speed), transform var(--transition-speed);
}

.detailed-hud.hidden {
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
}

.detailed-hud-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
    margin-bottom: 0.75rem;
}

.detailed-hud-header h3 {
    font-family: var(--font-header);
    font-size: 0.85rem;
    font-weight: 700;
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
}

.btn-clear-hud {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.25rem;
    cursor: pointer;
    line-height: 1;
    padding: 0;
    margin: 0;
    transition: color var(--transition-speed);
}

.btn-clear-hud:hover {
    color: var(--text-primary);
}

.detailed-hud-content {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.opt-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.opt-btn {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 0.45rem 0.6rem;
    color: var(--text-primary);
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    text-align: left;
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.opt-btn:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.15);
}

.opt-btn.active {
    background: rgba(99, 102, 241, 0.12);
    border-color: #818CF8;
}

.opt-status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-muted);
    transition: background-color var(--transition-speed), box-shadow var(--transition-speed);
}

.opt-btn.active .opt-status-dot {
    background-color: #818CF8;
    box-shadow: 0 0 6px #818CF8;
}

.opt-btn-label {
    flex-grow: 1;
}

.opt-help-text {
    font-size: 0.68rem;
    color: var(--text-muted);
    line-height: 1.35;
    margin: 0;
    padding: 0 0.15rem;
}

/* SVG D3 Packet Hover Labels */
.packet-label-bg {
    fill: rgba(15, 23, 42, 0.92);
    stroke: rgba(255, 255, 255, 0.15);
    stroke-width: 0.8px;
    rx: 4px;
    ry: 4px;
    pointer-events: none;
    transition: width var(--transition-speed), height var(--transition-speed), x var(--transition-speed), y var(--transition-speed);
}

.packet-label-text {
    font-family: var(--font-mono);
    font-size: 8px;
    font-weight: 700;
    fill: #E2E8F0;
    text-anchor: middle;
    dominant-baseline: middle;
    user-select: none;
    pointer-events: none;
}

/* Binary Details Deck Panel */
.binary-details-deck {
    background: rgba(0, 0, 0, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 8px;
    padding: 0.65rem;
    margin-top: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.4);
}

.binary-details-deck.hidden {
    display: none !important;
}

.binary-section-title {
    font-family: var(--font-header);
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--color-primary);
    margin: 0 0 0.15rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    padding-bottom: 0.2rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.binary-info-field {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.7rem;
}

.binary-field-label {
    color: var(--text-muted);
}

.binary-field-val {
    color: var(--text-primary);
    font-weight: 700;
}

.binary-data-block {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 4px;
    padding: 0.4rem 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.binary-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.7rem;
    line-height: 1.1;
}

.binary-label {
    color: var(--text-muted);
    font-weight: 700;
}

.binary-val-dec {
    color: #F59E0B; /* Amber Decimal IP */
    font-weight: 700;
}

.binary-val-bin {
    font-size: 9px;
    letter-spacing: 0.2px;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    margin-top: 0.1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.03);
    padding-top: 0.25rem;
}

/* Span Bit Colors */
.bit-net {
    color: #60A5FA; /* Blue matched Network bits */
    font-weight: 700;
    text-shadow: 0 0 2px rgba(96, 165, 250, 0.3);
}

.bit-host {
    color: #475569; /* Slate gray ignored Host bits */
    font-weight: 400;
}

.bit-dot {
    color: rgba(255, 255, 255, 0.15); /* Dot separators */
    font-weight: 700;
    margin: 0 1px;
}