:root {
    --bg-color: #0a0e14;
    --card-bg: rgba(255, 255, 255, 0.05);
    --text-primary: #ffffff;
    --text-secondary: #a0aec0;
    --accent-us: #4299e1;
    --accent-customer: #ecc94b;
    --accent-competitor: #f56565;
    --glass-border: rgba(255, 255, 255, 0.1);
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
    background-image: 
        radial-gradient(circle at 20% 30%, rgba(66, 153, 225, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(245, 101, 101, 0.05) 0%, transparent 40%);
}

.container {
    display: flex;
    width: 90vw;
    height: 85vh;
    gap: 40px;
    padding: 40px;
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    border-radius: 32px;
    border: 1px solid var(--glass-border);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.viz-section {
    flex: 1.5;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    position: relative;
}

.venn-container {
    width: 100%;
    max-width: 500px;
    aspect-ratio: 1;
    position: relative;
}

svg {
    width: 100%;
    height: 100%;
}

.circle {
    fill-opacity: 0.15;
    stroke-width: 3;
    transition: all 0.5s ease;
}

.circle-us { fill: var(--accent-us); stroke: var(--accent-us); }
.circle-customer { fill: var(--accent-customer); stroke: var(--accent-customer); }
.circle-competitor { fill: var(--accent-competitor); stroke: var(--accent-competitor); }

.bf-zone {
    cursor: pointer;
    transition: all 0.3s ease;
    fill: rgba(255,255,255,0);
}

.bf-zone:hover {
    fill: rgba(255,255,255,0.1);
}

.bf-zone.active {
    fill: rgba(255,255,255,0.2);
    stroke: #fff;
    stroke-width: 1;
}

.info-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding-left: 40px;
    border-left: 1px solid var(--glass-border);
}

.header h1 {
    font-size: 2.2rem;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #fff 0%, #888 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 40px;
}

.bf-card {
    background: rgba(255,255,255,0.03);
    border-radius: 24px;
    padding: 30px;
    border: 1px solid var(--glass-border);
    animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.bf-tag {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    margin-bottom: 20px;
    background: rgba(66, 153, 225, 0.2);
    color: var(--accent-us);
}

.bf-title {
    font-size: 1.5rem;
    line-height: 1.3;
    margin-bottom: 16px;
}

.bf-desc {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 24px;
    font-size: 1rem;
}

.strategy-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #888;
    margin-bottom: 8px;
}

.strategy-text {
    font-weight: 600;
    color: #fff;
    line-height: 1.5;
    padding-left: 16px;
    border-left: 3px solid var(--accent-us);
}

.legend {
    display: flex;
    gap: 24px;
    margin-top: 40px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.bf-label {
    fill: white;
    font-size: 14px;
    font-weight: 700;
    pointer-events: none;
    text-anchor: middle;
    opacity: 0.7;
}