/* ===== Reset & Base ===== */
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
      background: #f3f4f6;
      color: #1f2937;
      line-height: 1.6;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: opacity 0.2s;
    }

    /* ===== Header ===== */
    header {
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
      position: sticky;
      top: 0;
      z-index: 100;
    }

    .nav {
      max-width: 900px;
      margin: 0 auto;
      padding: 1rem 1.5rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .nav-brand {
      font-weight: 700;
      font-size: 1.25rem;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .nav a {
      font-weight: 600;
      color: #667eea;
      padding: 0.5rem 1rem;
      border-radius: 8px;
      background: #f3f4f6;
    }

    /* ===== Main Content ===== */
    main {
      max-width: 900px;
      margin: 0 auto;
      padding: 2rem 1.5rem;
      flex: 1;
    }

    /* ===== Hero Section ===== */
    .hero {
      background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
      border-radius: 20px;
      padding: 1rem 2rem;
      text-align: center;
      color: #4338ca;
      margin-bottom: 2rem;
      box-shadow: 0 10px 30px rgba(99, 102, 241, 0.15);
      border: 2px solid #c7d2fe;
    }

    .hero h1 {
      font-size: 2.4rem;
      font-weight: 800;
      margin-bottom: 0.5rem;
    }

    /* ===== Cards Grid ===== */
    .cards-container {
      display: grid;
      gap: 1rem;
      grid-template-columns: 1fr;
    }

    .card {
      background: white;
      border-radius: 16px;
      padding: 1rem;
      box-shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
      border: 2px solid transparent;
    }

    /* ===== One-Liner Card ===== */
    .one-liner {
      background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
      border-left: 5px solid #6366f1;
      font-size: 1.2rem;
      font-weight: 600;
      color: #4338ca;
      padding: 1.75rem;
    }

    /* ===== Analogy Card ===== */
    .analogy {
      background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
      border-left: 5px solid #f59e0b;
    }

    .analogy h2 {
      color: #92400e;
      font-size: 1.1rem;
      margin-bottom: 0.75rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .analogy h2::before {
      content: "💡";
      font-size: 1.4rem;
    }

    .analogy p {
      color: #78350f;
      font-size: 1.1rem;
      font-weight: 500;
    }

    /* ===== Visual Card ===== */
    .visual-card {
      background: #f9fafb;
      padding: 2rem;
      text-align: center;
    }

    .visual-card h2 {
      color: #4b5563;
      font-size: 1.1rem;
      margin-bottom: 1.5rem;
      text-transform: uppercase;
      letter-spacing: 1px;
      font-weight: 700;
    }

    .visual-card img {
      max-width: 100%;
      height: auto;
      border-radius: 12px;
    }

    /* ===== Summary Card ===== */
    .summary {
      background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
      border-left: 5px solid #10b981;
      text-align: center;
    }

    .summary h2 {
      color: #065f46;
      font-size: 1.1rem;
      margin-bottom: 0.75rem;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
    }

    .summary h2::before {
      content: "✓";
      font-size: 1.4rem;
      font-weight: bold;
    }

    .summary p {
      color: #064e3b;
      font-size: 1.2rem;
      font-weight: 700;
    }

    /* ===== Closer Look Card ===== */
    .closer {
      background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
      border-left: 5px solid #6366f1;
      font-size: 1.2rem;
      font-weight: 600;
      color: #333;
      padding: 1.75rem;
    }
    /* ===== Footer ===== */
    footer {
      text-align: center;
      padding: 2rem 1rem;
      color: #6b7280;
      font-size: 0.95rem;
      background: white;
      border-top: 1px solid #e5e7eb;
      margin-top: 2rem;
    }

    footer a {
      color: #667eea;
      font-weight: 600;
      text-decoration: underline;
    }

    /* ===== Responsive Design ===== */
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2rem;
      }

      .one-liner {
        font-size: 1.1rem;
      }

      main {
        padding: 1.5rem 1rem;
      }
    }