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

    :root {
      --primary: #2563eb;
      --primary-dark: #1d4ed8;
      --primary-light: #dbeafe;
      --text: #1e293b;
      --text-light: #64748b;
      --bg: #ffffff;
      --bg-gray: #f8fafc;
      --bg-dark: #0f172a;
      --radius: 12px;
      --shadow: 0 4px 24px rgba(0,0,0,0.08);
    }

    html { scroll-behavior: smooth; }

    body {
      font-family: "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
      color: var(--text);
      line-height: 1.8;
      overflow-x: hidden;
      background: var(--bg);
    }

    a { text-decoration: none; color: inherit; }
    .container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

    /* ===== Header ===== */
    header {
      position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
      background: rgba(255,255,255,0.92); backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0,0,0,0.06); box-shadow: 0 2px 16px rgba(0,0,0,0.08);
    }
    .header-inner {
      display: flex; align-items: center; justify-content: space-between;
      height: 64px; max-width: 1100px; margin: 0 auto; padding: 0 20px;
    }
    .logo { font-size: 1.4rem; font-weight: 800; color: var(--primary); display: flex; align-items: center; gap: 8px; }
    .header-cta {
      font-size: 0.85rem; font-weight: 700; color: #fff; background: var(--primary);
      padding: 8px 20px; border-radius: 100px; transition: background 0.2s, transform 0.2s;
    }
    .header-cta:hover { background: var(--primary-dark); transform: translateY(-1px); }

    /* ===== Breadcrumb ===== */
    .breadcrumb { padding: 88px 0 0; font-size: 0.8rem; color: var(--text-light); }
    .breadcrumb a { color: var(--primary); }
    .breadcrumb a:hover { text-decoration: underline; }
    .breadcrumb span { margin: 0 6px; }

    /* ===== Page Hero ===== */
    .page-hero {
      padding: 24px 0 48px;
      background: linear-gradient(170deg, #eff6ff 0%, #fff 60%);
      text-align: center;
    }
    .page-hero h1 { font-size: clamp(1.6rem, 4vw, 2.2rem); font-weight: 800; line-height: 1.4; margin-bottom: 8px; }
    .page-hero p { font-size: 0.9rem; color: var(--text-light); }

    /* ===== Filter Bar ===== */
    .filter-bar { padding: 24px 0 0; display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
    .filter-label { font-size: 0.8rem; color: var(--text-light); margin-right: 4px; }
    .filter-btn {
      font-size: 0.8rem; font-weight: 600; padding: 5px 14px;
      border: 1.5px solid #e2e8f0; border-radius: 100px;
      background: #fff; color: var(--text-light); cursor: pointer;
      transition: all 0.18s;
    }
    .filter-btn:hover { border-color: var(--primary); color: var(--primary); }
    .filter-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; }
    .filter-count { font-size: 0.75rem; margin-left: 4px; opacity: 0.7; }

    /* ===== Article Grid ===== */
    .article-list { padding: 24px 0 80px; }
    .result-info { font-size: 0.8rem; color: var(--text-light); margin-bottom: 20px; }
    .article-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .article-card {
      background: #fff; border-radius: var(--radius); border: 1px solid #e2e8f0;
      overflow: hidden; transition: transform 0.2s, box-shadow 0.2s;
      display: flex; flex-direction: column;
    }
    .article-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
    .article-card-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
    .article-card-meta { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; font-size: 0.8rem; }
    .area-badge {
      display: inline-block; background: var(--primary-light); color: var(--primary);
      font-size: 0.7rem; font-weight: 700; padding: 2px 8px; border-radius: 100px;
    }
    .article-card-date { color: var(--text-light); font-size: 0.75rem; }
    .article-card-title { font-size: 1rem; font-weight: 700; line-height: 1.5; margin-bottom: 8px; color: var(--text); }
    .article-card-desc { font-size: 0.85rem; color: var(--text-light); line-height: 1.7; flex: 1; }
    .article-card-link {
      display: block; padding: 12px 24px; text-align: center;
      font-size: 0.85rem; font-weight: 600; color: var(--primary);
      border-top: 1px solid #e2e8f0; transition: background 0.2s;
    }
    .article-card-link:hover { background: var(--bg-gray); }

    /* hidden card */
    .article-card.hidden { display: none; }

    /* ===== Empty State ===== */
    .empty-state { text-align: center; padding: 60px 0; color: var(--text-light); font-size: 0.95rem; }

    /* ===== Back Link ===== */
    .back-link {
      display: inline-flex; align-items: center; gap: 6px;
      font-size: 0.95rem; font-weight: 600; color: var(--primary);
      margin-top: 40px; transition: opacity 0.2s;
    }
    .back-link:hover { opacity: 0.7; }

    /* ===== Footer ===== */
    footer { background: var(--bg-dark); color: #94a3b8; padding: 32px 0; text-align: center; }
    footer p { font-size: 0.8rem; }

    @media (max-width: 900px) {
      .article-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 640px) {
      .breadcrumb { padding-top: 76px; }
      .page-hero { padding: 16px 0 36px; }
      .article-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; }
      .filter-bar { gap: 6px; }
    }