:root {
    --harmony-green: #00b894;
    --service-blue: #0984e3;
    --warm-orange: #fd79a8;
    --warning-yellow: #fdcb6e;
    --text-primary: #2d3436;
    --text-secondary: #636e72;
    --bg-light: #f8f9fa;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.08);

    --font-family: "Noto Serif SC", "Outfit", serif;
    --font-mono: "JetBrains Mono", monospace;
    --font-title: "Ma Shan Zheng", cursive;
}

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

body {
    font-family: var(--font-family);
    background: linear-gradient(135deg, #a8e6cf 0%, #dcedc1 50%, #ffd3b6 100%);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

.app-container {
    width: 96vw;
    height: 92vh;
    max-width: 1800px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(30px);
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Header */
.main-header {
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.9) 0%, rgba(248, 249, 250, 0.9) 100%);
    border-bottom: 2px solid rgba(0, 184, 148, 0.2);
}

.header-content h1 {
    font-family: var(--font-title);
    font-size: 1.8rem;
    color: var(--harmony-green);
}

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

.subtitle {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

.header-controls {
    display: flex;
    gap: 10px;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    border: none;
    border-radius: 10px;
    font-family: var(--font-family);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.3s;
    background: #fff;
    color: var(--text-secondary);
    box-shadow: var(--shadow-sm);
}

.action-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.action-btn:active {
    transform: translateY(0);
}

.action-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

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

.action-btn.success {
    background: var(--harmony-green);
    color: white;
}

.action-btn.secondary {
    background: var(--warm-orange);
    color: white;
}

.action-btn .icon {
    font-size: 1.1rem;
}

/* Main Stage */
.main-stage {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr 360px;
    overflow: hidden;
}

.canvas-container {
    position: relative;
    background: linear-gradient(135deg, #fdfcfb 0%, #f7f7f7 100%);
    overflow: hidden;
}

#networkCanvas {
    width: 100%;
    height: 100%;
    cursor: crosshair;
}

.canvas-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    padding: 20px;
}

.mode-indicator {
    background: rgba(255, 255, 255, 0.95);
    padding: 14px 18px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--service-blue);
    max-width: 350px;
}

.mode-indicator strong {
    display: block;
    margin-bottom: 4px;
    color: var(--service-blue);
}

.mode-indicator p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0;
}

.legend {
    position: absolute;
    bottom: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.95);
    padding: 16px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    min-width: 200px;
}

.legend h4 {
    font-size: 0.9rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

#legendItems {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.85rem;
}

.legend-color {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    border: 2px solid #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* Sidebar */
.sidebar {
    background: var(--bg-light);
    border-left: 1px solid rgba(0, 0, 0, 0.05);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
}

.panel-section {
    background: white;
    padding: 18px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}

.panel-section h3 {
    font-size: 1rem;
    margin-bottom: 14px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 6px;
}

.stats-panel {
    border-top: 3px solid var(--harmony-green);
}

.stat-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: var(--bg-light);
    border-radius: 10px;
    transition: all 0.3s;
}

.stat-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.stat-item.highlight {
    grid-column: span 2;
    background: linear-gradient(135deg, rgba(9, 132, 227, 0.1) 0%, rgba(9, 132, 227, 0.05) 100%);
}

.stat-item.warning {
    grid-column: span 2;
    background: linear-gradient(135deg, rgba(253, 203, 110, 0.2) 0%, rgba(253, 203, 110, 0.05) 100%);
}

.stat-icon {
    font-size: 1.8rem;
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-size: 1.4rem;
    font-weight: 700;
    font-family: var(--font-mono);
    color: var(--text-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

.math-box {
    background: #f8f9fa;
    padding: 16px;
    border-radius: 10px;
    font-size: 0.9rem;
    line-height: 1.7;
}

.math-box strong {
    color: var(--service-blue);
    display: block;
    margin-bottom: 6px;
}

.property-list {
    margin: 12px 0;
    padding: 12px;
    background: white;
    border-radius: 8px;
}

.property {
    padding: 6px 0;
    color: var(--harmony-green);
    font-size: 0.85rem;
}

.insight-card {
    background: linear-gradient(135deg, #e3fdf5 0%, #fff 100%);
    padding: 16px;
    border-radius: 10px;
    border-left: 4px solid var(--harmony-green);
    font-size: 0.9rem;
    line-height: 1.7;
}

.insight-card ul {
    margin-top: 10px;
    margin-left: 20px;
}

.insight-card li {
    margin: 6px 0;
    color: var(--text-secondary);
}

.community-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 200px;
    overflow-y: auto;
}

.community-item {
    padding: 10px 12px;
    background: var(--bg-light);
    border-radius: 8px;
    border-left: 4px solid;
    font-size: 0.85rem;
}

.community-item strong {
    display: block;
    margin-bottom: 4px;
}

.community-item span {
    color: var(--text-secondary);
    font-size: 0.8rem;
}