:root {
    --primary-color: #2563eb;
    --secondary-color: #7c3aed;
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --text-color: #e2e8f0;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --node-color: #60a5fa;
    --link-color: #6366f1;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

main {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 30px;
}

.input-section {
    background: var(--surface-color);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

#textInput {
    width: 100%;
    height: 200px;
    background: var(--background-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    font-size: 1rem;
    resize: vertical;
    margin-bottom: 15px;
}

#textInput:focus {
    outline: none;
    border-color: var(--primary-color);
}

.controls {
    display: flex;
    gap: 10px;
    align-items: center;
}

button {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

#analyzeBtn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    flex: 1;
}

#analyzeBtn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(37, 99, 235, 0.4);
}

#clearBtn {
    background: var(--border-color);
    color: var(--text-color);
}

#clearBtn:hover {
    background: #475569;
}

#langSelect {
    background: var(--background-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px 12px;
    font-size: 0.9rem;
}

.settings {
    background: var(--surface-color);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    grid-column: 1;
}

.settings label {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
    gap: 10px;
}

.settings span:first-child {
    flex: 1;
    font-size: 0.9rem;
}

.settings input[type="range"] {
    flex: 2;
    -webkit-appearance: none;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    outline: none;
}

.settings input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
}

.settings span:last-child {
    width: 30px;
    text-align: right;
    font-weight: 600;
}

#networkContainer {
    background: var(--surface-color);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    padding: 20px;
    position: relative;
    grid-column: 2;
    grid-row: 1 / 3;
}

#network {
    width: 100%;
    height: 600px;
    background: var(--background-color);
    border-radius: 8px;
}

.legend {
    position: absolute;
    top: 30px;
    right: 30px;
    background: rgba(30, 41, 59, 0.9);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.legend h3 {
    font-size: 0.9rem;
    margin-bottom: 10px;
    color: var(--text-secondary);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
    font-size: 0.85rem;
}

.node-sample {
    width: 20px;
    height: 20px;
    background: var(--node-color);
    border-radius: 50%;
}

.link-sample {
    width: 30px;
    height: 3px;
    background: var(--link-color);
    opacity: 0.5;
}

.info-panel {
    background: var(--surface-color);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    grid-column: 1;
}

.info-panel h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: var(--primary-color);
}

#keywordInfo {
    color: var(--text-secondary);
}

#keywordInfo.active {
    color: var(--text-color);
}

#keywordInfo p {
    margin-bottom: 10px;
}

#keywordInfo .keyword-name {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 15px;
}

#keywordInfo .stat {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ノードのスタイル */
.node {
    stroke: #fff;
    stroke-width: 2px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.node:hover {
    stroke-width: 4px;
}

.node.selected {
    stroke: #fbbf24;
    stroke-width: 4px;
}

.node-label {
    font-size: 12px;
    fill: var(--text-color);
    pointer-events: none;
    text-anchor: middle;
}

.link {
    stroke: var(--link-color);
    stroke-opacity: 0.4;
    transition: all 0.3s ease;
}

.link.highlighted {
    stroke-opacity: 0.8;
    stroke: #fbbf24;
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
    }
    
    #networkContainer {
        grid-column: 1;
        grid-row: auto;
    }
    
    #network {
        height: 400px;
    }
    
    h1 {
        font-size: 2rem;
    }
}