:root {
      --primary: #1a365d;
      --accent: #3182ce;
      --text: #2d3748;
      --bg-light: #f7fafc;
      --white: #ffffff;
      --muted:#718096;
      --border:#e2e8f0;
      --shadow: 0 12px 28px rgba(26, 54, 93, .08);
      --radius: 14px;
    }

    body {
      font-family: 'Inter', sans-serif;
      color: var(--text);
      line-height: 1.8;
      margin: 0;
      padding: 0;
      background: #fff;
    }

    a { color: var(--accent); text-decoration: none; }
    a:hover { text-decoration: underline; }

    .container { max-width: 900px; margin: 0 auto; padding: 0 20px; }

    /* Header & Hero */
    header {
      background: var(--bg-light);
      padding: 60px 0;
      border-bottom: 1px solid var(--border);
    }
    .post-category {
      color: var(--accent);
      font-weight: 700;
      text-transform: uppercase;
      font-size: 0.9rem;
      letter-spacing: 1px;
    }
    h1 {
      font-family: 'Lora', serif;
      font-size: 3rem;
      color: var(--primary);
      line-height: 1.2;
      margin: 16px 0 14px;
    }
    .meta { color: var(--muted); font-size: 0.95rem; }

    /* Featured Image */
    .cover {
      margin-top: 26px;
      border-radius: var(--radius);
      overflow: hidden;
      background: #fff;
      box-shadow: var(--shadow);
      border: 1px solid var(--border);
    }
    .cover img {
      display:block;
      width:100%;
      height:auto;
    }
    .cover figcaption {
      padding: 10px 14px;
      font-size: 0.92rem;
      color: var(--muted);
      background: #fff;
    }

    /* Content */
    .content { padding: 40px 0; font-size: 1.1rem; }

    h2 {
      color: var(--primary);
      font-size: 2rem;
      margin-top: 56px;
      border-left: 5px solid var(--accent);
      padding-left: 15px;
    }

    h3 { color: var(--primary); margin-top: 34px; }

    .comparison-box {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin: 40px 0;
      background: var(--bg-light);
      padding: 26px;
      border-radius: var(--radius);
      border: 1px solid var(--border);
    }
    .comparison-box h3 { margin-top:0; }
    .comparison-box ul { margin: 10px 0 0; padding-left: 18px; }
    .comparison-box li { margin: 8px 0; }

    /* Inline figure (Nano vs Pico pigment particles) */
    .figure {
      margin: 28px 0;
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow);
      border: 1px solid var(--border);
      background: #fff;
    }
    .figure img { width:100%; height:auto; display:block; }
    .figure figcaption {
      padding: 10px 14px;
      font-size: 0.92rem;
      color: var(--muted);
    }

    /* CTA */
    .cta-block {
      background: var(--primary);
      color: white;
      padding: 40px 28px;
      border-radius: 18px;
      text-align: center;
      margin: 54px 0;
      box-shadow: var(--shadow);
    }
    .cta-block h2 {
      color: #fff;
      border: none;
      padding: 0;
      margin: 0 0 10px;
      font-size: 1.9rem;
    }
    .cta-block p { margin: 0; opacity: .9; }
    .cta-block a {
      background: var(--accent);
      color: white;
      padding: 15px 30px;
      text-decoration: none;
      border-radius: 8px;
      font-weight: 700;
      display: inline-block;
      margin-top: 20px;
    }
    .cta-block a:hover { filter: brightness(1.05); text-decoration:none; }

    /* FAQ Section */
    .faq-section { background: #fdfdfd; padding: 60px 0; border-top: 1px solid var(--border); }
    .faq-title {
      font-family:'Lora', serif;
      color: var(--primary);
      text-align:center;
      margin: 0 0 36px;
      font-size: 2rem;
    }
    .faq-item {
      margin-bottom: 18px;
      border: 1px solid var(--border);
      border-radius: 14px;
      padding: 16px 18px;
      background: #fff;
      box-shadow: 0 6px 16px rgba(0,0,0,.04);
    }
    .faq-question {
      font-weight: 800;
      color: var(--primary);
      font-size: 1.1rem;
      cursor: pointer;
      display:flex;
      align-items:center;
      justify-content:space-between;
      gap: 12px;
      margin: 0;
    }
    .faq-question span.icon {
      width: 28px;
      height: 28px;
      border-radius: 999px;
      display:inline-flex;
      align-items:center;
      justify-content:center;
      background: var(--bg-light);
      color: var(--primary);
      font-weight: 900;
      flex: 0 0 auto;
    }
    .faq-answer { margin-top: 10px; color: #4a5568; display:none; }
    .faq-item.open .faq-answer { display:block; }

    footer {
      padding: 40px 0;
      text-align: center;
      background: #eee;
      font-size: 0.95rem;
      color:#4a5568;
      border-top: 1px solid var(--border);
    }

    @media (max-width: 768px) {
      h1 { font-size: 2.2rem; }
      .comparison-box { grid-template-columns: 1fr; }
      header { padding: 46px 0; }
    }