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

    :root {
      --app-accent: #8b5cf6;
      --app-accent-soft: #a78bfa;
      --app-glow: rgba(139, 92, 246, 0.12);
      --bg: #fafbff;
      --surface: #ffffff;
      --surface-alt: #f8f9fe;
      --border: #eef2f9;
      --text-primary: #111827;
      --text-secondary: #4b5563;
      --text-muted: #6b7280;
      --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.02), 0 1px 2px rgba(0, 0, 0, 0.03);
      --shadow-md: 0 12px 28px -8px rgba(0, 0, 0, 0.06);
      --radius-card: 28px;
      --radius-element: 20px;
    }

    [data-theme="dark"] {
      --bg: #0f1117;
      --surface: #1a1d2a;
      --surface-alt: #222633;
      --border: #2d313e;
      --text-primary: #f1f5f9;
      --text-secondary: #cbd5e1;
      --text-muted: #94a3b8;
    }

    body {
      font-family: 'Inter', sans-serif;
      background: var(--bg);
      color: var(--text-primary);
      line-height: 1.5;
    }

    .container {
      max-width: 1120px;
      margin: 0 auto;
      padding: 32px 24px 56px;
    }

    /* back link */
    .back-link {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: var(--surface);
      padding: 8px 20px;
      border-radius: 60px;
      font-size: 0.9rem;
      font-weight: 500;
      color: var(--text-secondary);
      text-decoration: none;
      border: 1px solid var(--border);
      margin-bottom: 32px;
      transition: 0.2s;
    }
    .back-link:hover {
      border-color: var(--app-accent);
      color: var(--app-accent);
      transform: translateX(-4px);
    }

    /* hero */
    .hero {
      background: var(--surface);
      border-radius: var(--radius-card);
      border: 1px solid var(--border);
      padding: 32px 36px;
      display: flex;
      align-items: center;
      gap: 32px;
      margin-bottom: 48px;
      box-shadow: var(--shadow-md);
    }
    .hero-icon img {
      width: 84px;
      height: 84px;
      border-radius: 20px;
      box-shadow: 0 12px 20px -12px rgba(0,0,0,0.2);
      background: #f0ecfe;
    }
    .hero-content {
      flex: 1;
    }
    .hero-title {
      font-family: 'Outfit', sans-serif;
      font-size: 2rem;
      font-weight: 800;
      letter-spacing: -0.02em;
      margin-bottom: 10px;
      background: linear-gradient(135deg, var(--text-primary) 30%, var(--app-accent) 80%);
      background-clip: text;
      -webkit-background-clip: text;
      color: transparent;
    }
    .hero-badge {
      display: inline-block;
      background: rgba(139,92,246,0.12);
      padding: 4px 12px;
      border-radius: 40px;
      font-size: 0.7rem;
      font-weight: 600;
      color: var(--app-accent);
      margin-bottom: 12px;
    }
    .hero-desc {
      color: var(--text-secondary);
      margin-bottom: 24px;
      font-size: 1rem;
      max-width: 90%;
    }
    .btn-google {
      display: inline-flex;
      align-items: center;
      gap: 12px;
      background: var(--app-accent);
      color: white;
      font-weight: 700;
      padding: 12px 28px;
      border-radius: 44px;
      text-decoration: none;
      transition: 0.2s;
      box-shadow: 0 6px 14px var(--app-glow);
    }
    .btn-google:hover {
      background: #7c3aed;
      transform: translateY(-2px);
    }

    /* features grid - clean & simple */
    .section-title {
      font-family: 'Outfit', sans-serif;
      font-size: 1.5rem;
      font-weight: 700;
      margin-bottom: 24px;
      letter-spacing: -0.3px;
    }
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-bottom: 48px;
    }
    .feature-card {
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: var(--radius-element);
      padding: 28px 24px;
      transition: all 0.2s;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      border-color: var(--app-accent-soft);
      box-shadow: 0 12px 24px -12px rgba(0,0,0,0.08);
    }
    .feature-icon {
      font-size: 2rem;
      color: var(--app-accent);
      margin-bottom: 20px;
      display: inline-block;
    }
    .feature-title {
      font-weight: 700;
      font-size: 1.2rem;
      margin-bottom: 12px;
      color: var(--text-primary);
    }
    .feature-text {
      color: var(--text-secondary);
      font-size: 0.9rem;
      line-height: 1.5;
    }

    /* privacy highlight */
    .privacy-card {
      background: var(--surface-alt);
      border-radius: var(--radius-element);
      padding: 28px 32px;
      border: 1px solid var(--border);
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 32px;
    }
    .privacy-text h3 {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .privacy-text p {
      color: var(--text-secondary);
      font-size: 0.9rem;
    }
    .privacy-link {
      background: transparent;
      border: 1px solid var(--border);
      padding: 10px 24px;
      border-radius: 40px;
      text-decoration: none;
      color: var(--app-accent);
      font-weight: 500;
      transition: 0.2s;
    }
    .privacy-link:hover {
      background: var(--app-accent);
      color: white;
      border-color: var(--app-accent);
    }

    /* use cases simple list */
    .usecase-row {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-top: 16px;
      margin-bottom: 48px;
    }
    .usecase-tag {
      background: var(--surface);
      border: 1px solid var(--border);
      padding: 10px 22px;
      border-radius: 60px;
      font-size: 0.85rem;
      font-weight: 500;
      color: var(--text-primary);
    }
    .usecase-tag i {
      color: var(--app-accent);
      margin-right: 8px;
    }

    .footer-note {
      text-align: center;
      padding-top: 32px;
      border-top: 1px solid var(--border);
      color: var(--text-muted);
      font-size: 0.8rem;
    }
    .footer-note a {
      color: var(--app-accent);
      text-decoration: none;
    }

    @media (max-width: 780px) {
      .container { padding: 20px 16px 40px; }
      .hero { flex-direction: column; text-align: center; padding: 28px 24px; }
      .hero-desc { max-width: 100%; }
      .features-grid { grid-template-columns: 1fr; gap: 16px; }
      .privacy-card { flex-direction: column; gap: 16px; text-align: center; }
      .hero-title { font-size: 1.7rem; }
    }