:root {
    /* Aerospace Theme */
    --app-bg: #0b1026;
    --sidebar-bg: rgba(16, 24, 48, 0.9);
    --glass-border: rgba(0, 240, 255, 0.3);
    --text-primary: #e0e6ed;
    --text-secondary: #8b9bb4;

    --accent-blue: #00f0ff;
    --accent-red: #ff3b30;
    --accent-gold: #ffd700;
    --accent-green: #27c93f;

    --node-bg: #1a2642;
    --node-border: #00f0ff;

    --edge-default: rgba(0, 240, 255, 0.15);
    --edge-scanning: #ffd700;
    --edge-mst: #00f0ff;
    --edge-rejected: #ff3b30;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.7);

    --font-family: "Orbitron", "Outfit", sans-serif;
    --font-text: "Noto Serif SC", serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--app-bg);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    background-image: radial-gradient(circle at 50% 50%, #1a2642 0%, #0b1026 100%);
}

.app-container {
    width: 90vw;
    height: 85vh;
    max-width: 1400px;
    background: rgba(16, 24, 48, 0.85);
    backdrop-filter: blur(20px) saturate(120%);
    -webkit-backdrop-filter: blur(20px) saturate(120%);
    border-radius: 24px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
    display: flex;
    overflow: hidden;
}

.sidebar {
    width: 360px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.2rem;
    flex-shrink: 0;
    overflow-y: auto;
    z-index: 20;
}

.sidebar-header {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.window-controls {
    display: flex;
    gap: 8px;
    margin-bottom: 0.5rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red {
    background: #ff5f56;
}

.dot.yellow {
    background: #ffbd2e;
}

.dot.green {
    background: #27c93f;
}

h1 {
    font-family: var(--font-family);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    text-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
}

.subtitle {
    font-family: var(--font-text);
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: -5px;
}

.highlight {
    color: var(--accent-blue);
}

.controls-wrapper {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    flex-grow: 1;
}

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

label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--accent-blue);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.apple-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    font-family: var(--font-family);
    gap: 8px;
    text-transform: uppercase;
}

.primary-btn {
    background: rgba(0, 240, 255, 0.1);
    color: var(--accent-blue);
    border-color: var(--accent-blue);
    box-shadow: 0 0 10px rgba(0, 240, 255, 0.2);
}

.primary-btn:hover {
    background: rgba(0, 240, 255, 0.2);
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
    transform: translateY(-1px);
}

.secondary-btn {
    background: rgba(255, 215, 0, 0.1);
    color: var(--accent-gold);
    border-color: var(--accent-gold);
}

.secondary-btn:hover {
    background: rgba(255, 215, 0, 0.2);
    box-shadow: 0 0 10px rgba(255, 215, 0, 0.3);
}

.danger-btn {
    background: rgba(255, 59, 48, 0.1);
    color: var(--accent-red);
    border-color: var(--accent-red);
}

.danger-btn:hover {
    background: rgba(255, 59, 48, 0.2);
    box-shadow: 0 0 10px rgba(255, 59, 48, 0.3);
}

.apple-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

input[type=range] {
    appearance: none;
    width: 100%;
    background: transparent;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 16px;
    width: 16px;
    border-radius: 50%;
    background: var(--accent-blue);
    cursor: pointer;
    margin-top: -6px;
    box-shadow: 0 0 10px var(--accent-blue);
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
}

.info-panel {
    background: rgba(0, 0, 0, 0.3);
    padding: 12px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

#statusText {
    font-size: 0.85rem;
    color: var(--accent-blue);
    margin-bottom: 12px;
    min-height: 1.2em;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 10px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
}

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

.stat-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    font-family: monospace;
}

.highlight-stat .stat-value {
    color: var(--accent-gold);
}

/* Edge List */
.edge-list-container {
    height: 180px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow-y: auto;
    padding: 4px;
}

.edge-item {
    display: flex;
    justify-content: space-between;
    padding: 6px 10px;
    margin-bottom: 2px;
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: all 0.2s;
    cursor: default;
}

.edge-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.edge-item.current {
    background: rgba(255, 215, 0, 0.2);
    color: var(--accent-gold);
    border-left: 3px solid var(--accent-gold);
}

.edge-item.accepted {
    background: rgba(0, 240, 255, 0.2);
    color: var(--accent-blue);
    border-left: 3px solid var(--accent-blue);
}

.edge-item.rejected {
    background: rgba(255, 59, 48, 0.2);
    color: var(--accent-red);
    border-left: 3px solid var(--accent-red);
    opacity: 0.6;
    text-decoration: line-through;
}

.edge-item .cost {
    font-family: monospace;
    font-weight: 700;
}

.info-box {
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.05), rgba(11, 16, 38, 0.8));
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid rgba(0, 240, 255, 0.2);
}

.info-box h3 {
    font-size: 0.9rem;
    color: var(--accent-blue);
    margin-bottom: 0.5rem;
    font-family: var(--font-family);
}

.info-box p {
    font-family: var(--font-text);
    font-size: 0.75rem;
    line-height: 1.4;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
}

.visualizer-stage {
    flex-grow: 1;
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    background: #050814;
}

.glass-pane {
    width: 100%;
    height: 100%;
    background: rgba(16, 24, 48, 0.4);
    border-radius: 16px;
    box-shadow: inset 0 0 50px rgba(0, 240, 255, 0.1);
    border: 1px solid rgba(0, 240, 255, 0.2);
    position: relative;
    overflow: hidden;
}

.stars-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(1px 1px at 10% 10%, white, transparent),
        radial-gradient(1px 1px at 20% 20%, white, transparent),
        radial-gradient(2px 2px at 30% 30%, white, transparent),
        radial-gradient(1px 1px at 40% 40%, white, transparent),
        radial-gradient(2px 2px at 50% 50%, white, transparent),
        radial-gradient(1px 1px at 60% 60%, white, transparent),
        radial-gradient(2px 2px at 70% 70%, white, transparent),
        radial-gradient(1px 1px at 80% 80%, white, transparent),
        radial-gradient(2px 2px at 90% 90%, white, transparent);
    background-size: 200px 200px;
    opacity: 0.3;
    animation: twinkle 5s infinite alternate;
}

@keyframes twinkle {
    from {
        opacity: 0.3;
    }

    to {
        opacity: 0.5;
    }
}

.graph-title {
    position: absolute;
    top: 1rem;
    left: 1rem;
    background: rgba(16, 24, 48, 0.9);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--accent-blue);
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
    z-index: 10;
    pointer-events: none;
}

.graph-title h2 {
    font-family: var(--font-family);
    font-size: 1.2rem;
    color: var(--accent-blue);
    margin: 0;
    text-shadow: 0 0 5px var(--accent-blue);
}

.graph-title p {
    font-family: var(--font-text);
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin: 4px 0 0 0;
}

.legend {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(16, 24, 48, 0.9);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 10;
    pointer-events: none;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--node-bg);
    border: 1px solid var(--node-border);
}

.legend-dot.connected {
    background: var(--accent-blue);
    box-shadow: 0 0 8px var(--accent-blue);
}

.legend-line {
    width: 20px;
    height: 2px;
    background: var(--edge-default);
}

.legend-line.mst {
    background: var(--edge-mst);
    box-shadow: 0 0 5px var(--edge-mst);
}

.legend-line.scanning {
    background: var(--edge-scanning);
}

.legend-line.rejected {
    background: var(--edge-rejected);
    border-bottom: 1px dashed var(--edge-rejected);
}

.node-popup {
    position: absolute;
    background: rgba(16, 24, 48, 0.95);
    padding: 12px;
    border-radius: 4px;
    border: 1px solid var(--accent-blue);
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.5);
    z-index: 100;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
    max-width: 200px;
}

.node-popup h3 {
    font-family: var(--font-family);
    font-size: 0.9rem;
    color: var(--accent-blue);
    margin-bottom: 4px;
}

.node-popup p {
    font-family: var(--font-text);
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.3;
}

/* Graph Elements */
.edge-line {
    stroke: var(--edge-default);
    stroke-width: 1px;
    transition: all 0.3s ease;
}

.edge-line.scanning {
    stroke: var(--edge-scanning);
    stroke-width: 3px;
    stroke-dasharray: 5, 5;
    animation: dash 1s linear infinite;
    filter: drop-shadow(0 0 3px var(--edge-scanning));
}

.edge-line.mst {
    stroke: var(--edge-mst);
    stroke-width: 3px;
    filter: drop-shadow(0 0 5px var(--edge-mst));
    animation: pulse-line 2s infinite;
}

.edge-line.rejected {
    stroke: var(--edge-rejected);
    stroke-width: 2px;
    stroke-dasharray: 2, 2;
    opacity: 0.5;
}

@keyframes dash {
    to {
        stroke-dashoffset: -10;
    }
}

@keyframes pulse-line {

    0%,
    100% {
        stroke-opacity: 0.8;
    }

    50% {
        stroke-opacity: 1;
    }
}

.edge-label {
    font-family: monospace;
    font-size: 10px;
    fill: var(--text-secondary);
    text-anchor: middle;
    pointer-events: none;
    opacity: 0.7;
}

.edge-label-bg {
    fill: rgba(11, 16, 38, 0.8);
}

.node-group {
    cursor: pointer;
    transition: transform 0.2s ease;
}

.node-group:hover {
    transform: scale(1.1);
}

.node-circle {
    fill: var(--node-bg);
    stroke: var(--node-border);
    stroke-width: 2px;
    transition: all 0.3s ease;
}

.node-circle.connected {
    fill: rgba(0, 240, 255, 0.2);
    box-shadow: 0 0 10px var(--accent-blue);
}

.node-icon {
    font-size: 16px;
    pointer-events: none;
    user-select: none;
    fill: white;
}

.node-text {
    font-family: var(--font-text);
    font-size: 11px;
    fill: var(--text-secondary);
    pointer-events: none;
    user-select: none;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.8);
}

.node-group:hover .node-text {
    fill: var(--accent-blue);
}

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

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.05);
}

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

::-webkit-scrollbar-thumb:hover {
    background: #00c0cc;
}