<!-- 벤 다이어그램: SVG premium (N개 자동 배치) -->
<!--
  📋 venn-diagram (P2-B: 동적 좌표 계산)
  ─────────────────
  용도: 상위-하위 포함 관계, 기술 융합 구조
  방식: renderer가 svg_calculator.prepare_venn_data()로 좌표 사전 계산
        → items[].cx, cy, r + outer_r, center_x, center_y 전달
  Phase 1 fallback: outer_r이 없으면 3개 고정 좌표 사용
-->
<div class="block-venn-svg">
  {% if outer_r is defined %}
  {# ═══ P2-B: 동적 N개 배치 ═══ #}
  <svg viewBox="0 0 {{ viewbox_width | default(600) }} {{ viewbox_height | default(550) }}" width="100%" xmlns="http://www.w3.org/2000/svg" font-family="Pretendard Variable, sans-serif">
    <defs>
      <linearGradient id="bgGrad" x1="0" y1="0" x2="0" y2="1">
        <stop offset="0%" stop-color="#dce3ea" />
        <stop offset="100%" stop-color="#f0f2f5" />
      </linearGradient>
      <radialGradient id="blueOuter" cx="45%" cy="40%" r="55%">
        <stop offset="0%" stop-color="#2979ff" />
        <stop offset="40%" stop-color="#1565c0" />
        <stop offset="100%" stop-color="#0d47a1" />
      </radialGradient>
      <radialGradient id="hlGrad" cx="35%" cy="25%" r="40%">
        <stop offset="0%" stop-color="rgba(255,255,255,0.5)" />
        <stop offset="100%" stop-color="rgba(255,255,255,0)" />
      </radialGradient>
      <filter id="glow" x="-20%" y="-20%" width="140%" height="140%">
        <feGaussianBlur stdDeviation="8" result="blur" />
        <feMerge><feMergeNode in="blur" /><feMergeNode in="SourceGraphic" /></feMerge>
      </filter>
      <filter id="shadow">
        <feDropShadow dx="0" dy="4" stdDeviation="8" flood-color="rgba(0,0,0,0.3)" />
      </filter>
      {% for item in items %}
      <radialGradient id="itemGrad{{ loop.index }}" cx="35%" cy="30%" r="65%">
        <stop offset="0%" stop-color="{{ item.color_light | default('#93c5fd') }}" />
        <stop offset="100%" stop-color="{{ item.color | default('#3b82f6') }}" />
      </radialGradient>
      {% endfor %}
    </defs>

    <rect width="{{ viewbox_width | default(600) }}" height="{{ viewbox_height | default(550) }}" fill="url(#bgGrad)" />

    <circle cx="{{ center_x }}" cy="{{ center_y }}" r="{{ outer_r }}" fill="url(#blueOuter)" filter="url(#shadow)" />
    <circle cx="{{ center_x }}" cy="{{ center_y }}" r="{{ outer_r - 10 }}" fill="none" stroke="#4a90d9" stroke-width="1.5" opacity="0.4" />
    <circle cx="{{ center_x }}" cy="{{ center_y }}" r="{{ outer_r - 25 }}" fill="none" stroke="#5a9de0" stroke-width="1" opacity="0.3" />
    <circle cx="{{ center_x }}" cy="{{ center_y }}" r="{{ outer_r - 40 }}" fill="none" stroke="#6aabe6" stroke-width="0.8" opacity="0.25" />

    {% for item in items %}
    <circle cx="{{ item.cx }}" cy="{{ item.cy }}" r="{{ item.r }}" fill="url(#itemGrad{{ loop.index }})" opacity="0.9" filter="url(#glow)" />
    <circle cx="{{ item.cx }}" cy="{{ item.cy }}" r="{{ item.r }}" fill="url(#hlGrad)" />
    <text x="{{ item.cx }}" y="{{ item.cy }}" text-anchor="middle" dominant-baseline="central" fill="white" font-size="{% if item.r > 60 %}18{% elif item.r > 40 %}15{% else %}12{% endif %}" font-weight="700">{{ item.label }}</text>
    {% if item.sub %}
    <text x="{{ item.cx }}" y="{{ item.cy + 18 }}" text-anchor="middle" fill="white" font-size="11" opacity="0.85">{{ item.sub }}</text>
    {% endif %}
    {% endfor %}

    <text x="{{ center_x }}" y="{{ center_y - outer_r + 35 }}" text-anchor="middle" fill="#ffffff" font-size="13" font-weight="400" opacity="0.85">{{ center_sub | default('') }}</text>
    <text x="{{ center_x }}" y="{{ center_y - outer_r + 60 }}" text-anchor="middle" fill="#ffffff" font-size="24" font-weight="900">{{ center_label }}</text>
  </svg>

  {% else %}
  {# ═══ Phase 1 fallback: 3개 고정 ═══ #}
  <svg viewBox="0 0 600 550" width="100%" xmlns="http://www.w3.org/2000/svg" font-family="Pretendard Variable, sans-serif">
    <defs>
      <linearGradient id="bgGrad" x1="0" y1="0" x2="0" y2="1"><stop offset="0%" stop-color="#dce3ea" /><stop offset="100%" stop-color="#f0f2f5" /></linearGradient>
      <radialGradient id="blueOuter" cx="45%" cy="40%" r="55%"><stop offset="0%" stop-color="#2979ff" /><stop offset="40%" stop-color="#1565c0" /><stop offset="100%" stop-color="#0d47a1" /></radialGradient>
      <radialGradient id="orangeGrad" cx="35%" cy="35%" r="65%"><stop offset="0%" stop-color="#ffab40" /><stop offset="40%" stop-color="#ff6d00" /><stop offset="100%" stop-color="#c2185b" /></radialGradient>
      <radialGradient id="mintGrad" cx="40%" cy="30%" r="65%"><stop offset="0%" stop-color="#80deea" /><stop offset="40%" stop-color="#26c6da" /><stop offset="100%" stop-color="#00897b" /></radialGradient>
      <radialGradient id="goldGrad" cx="40%" cy="30%" r="65%"><stop offset="0%" stop-color="#ffd54f" /><stop offset="40%" stop-color="#ffb300" /><stop offset="100%" stop-color="#e65100" /></radialGradient>
      <radialGradient id="hlGrad" cx="35%" cy="25%" r="40%"><stop offset="0%" stop-color="rgba(255,255,255,0.5)" /><stop offset="100%" stop-color="rgba(255,255,255,0)" /></radialGradient>
      <filter id="glow" x="-20%" y="-20%" width="140%" height="140%"><feGaussianBlur stdDeviation="8" result="blur" /><feMerge><feMergeNode in="blur" /><feMergeNode in="SourceGraphic" /></feMerge></filter>
      <filter id="shadow"><feDropShadow dx="0" dy="4" stdDeviation="8" flood-color="rgba(0,0,0,0.3)" /></filter>
    </defs>
    <rect width="600" height="550" fill="url(#bgGrad)" />
    <circle cx="300" cy="270" r="230" fill="url(#blueOuter)" filter="url(#shadow)" />
    <circle cx="300" cy="270" r="220" fill="none" stroke="#4a90d9" stroke-width="1.5" opacity="0.4" />
    <circle cx="300" cy="270" r="205" fill="none" stroke="#5a9de0" stroke-width="1" opacity="0.3" />
    <circle cx="300" cy="270" r="190" fill="none" stroke="#6aabe6" stroke-width="0.8" opacity="0.25" />
    <circle cx="265" cy="300" r="120" fill="url(#orangeGrad)" opacity="0.92" filter="url(#glow)" />
    <circle cx="265" cy="300" r="120" fill="url(#hlGrad)" />
    <circle cx="370" cy="230" r="75" fill="url(#mintGrad)" opacity="0.9" filter="url(#glow)" />
    <circle cx="370" cy="230" r="75" fill="url(#hlGrad)" />
    <circle cx="365" cy="355" r="75" fill="url(#goldGrad)" opacity="0.9" filter="url(#glow)" />
    <circle cx="365" cy="355" r="75" fill="url(#hlGrad)" />
    <text x="300" y="95" text-anchor="middle" fill="#ffffff" font-size="13" font-weight="400" opacity="0.85">{{ center_sub | default('') }}</text>
    <text x="300" y="125" text-anchor="middle" fill="#ffffff" font-size="26" font-weight="900">{{ center_label }}</text>
    {% if items and items | length > 0 %}<text x="250" y="295" text-anchor="middle" fill="#ffffff" font-size="20" font-weight="800">{{ items[0].label }}</text>{% if items[0].sub %}<text x="250" y="318" text-anchor="middle" fill="#ffffff" font-size="13" opacity="0.85">{{ items[0].sub }}</text>{% endif %}{% endif %}
    {% if items and items | length > 1 %}<text x="370" y="237" text-anchor="middle" fill="#ffffff" font-size="20" font-weight="800">{{ items[1].label }}</text>{% endif %}
    {% if items and items | length > 2 %}<text x="365" y="362" text-anchor="middle" fill="#ffffff" font-size="20" font-weight="800">{{ items[2].label }}</text>{% endif %}
  </svg>
  {% endif %}

  {% if description %}
  <div class="venn-desc">{{ description }}</div>
  {% endif %}
</div>

<style>
.block-venn-svg {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  flex-shrink: 1;
  min-height: 0;
  overflow: hidden;
}
.block-venn-svg svg {
  max-width: 450px;
  width: 100%;
  height: auto;
  flex-shrink: 1;
}
.venn-desc {
  font-size: 14px;
  color: #444;
  text-align: center;
  max-width: 450px;
  line-height: 1.7;
  word-break: keep-all;
}
</style>
