:root {
      --bg: #f4f6f8;
      --surface: #ffffff;
      --text: #111827;
      --muted: #6b7280;
      --line: #e5e7eb;
      --accent: #e11d48;
      --accent-hover: #be123c;
      --accent-soft: #fff1f2;
      --ok: #059669;
      --info: #1d4ed8;
      --radius: 14px;
      --radius-sm: 10px;
      --shadow: 0 1px 2px rgba(0,0,0,.04), 0 4px 16px rgba(0,0,0,.04);
      --max: 720px;
      --tap: 48px;
    }

    *, *::before, *::after { box-sizing: border-box; }
    html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
    body {
      margin: 0;
      font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.6;
      font-size: 16px;
      min-height: 100dvh;
    }
    img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
    a { color: var(--info); }
    a:hover { text-decoration: underline; }

    /* Banner */
    .banner {
      background: #fff7ed;
      color: #9a3412;
      border-bottom: 1px solid #fed7aa;
      padding: 10px 16px;
      font-size: 13px;
      line-height: 1.4;
      text-align: center;
    }

    .wrap {
      width: 100%;
      max-width: var(--max);
      margin: 0 auto;
      padding: 0 16px 56px;
    }

    /* Header */
    .site-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding: 14px 0 8px;
      position: sticky;
      top: 0;
      z-index: 20;
      background: color-mix(in srgb, var(--bg) 92%, transparent);
      backdrop-filter: blur(8px);
    }
    .logo {
      font-weight: 700;
      font-size: 17px;
      color: var(--text);
      text-decoration: none;
      letter-spacing: -0.02em;
    }
    .logo:hover { text-decoration: none; color: var(--accent); }

    /* Hero */
    h1 {
      font-size: clamp(1.35rem, 4.5vw, 1.85rem);
      line-height: 1.25;
      letter-spacing: -0.02em;
      margin: 8px 0 10px;
      font-weight: 750;
    }
    .meta-row {
      display: flex;
      flex-wrap: wrap;
      gap: 8px 14px;
      align-items: center;
      font-size: 13px;
      color: var(--muted);
      margin-bottom: 14px;
    }
    .meta-row span {
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .lead {
      font-size: 1.05rem;
      color: #1f2937;
      margin: 0 0 16px;
    }
    .hero-img {
      margin: 0 0 18px;
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow);
      border: 1px solid var(--line);
      background: var(--surface);
    }
    .hero-img img { width: 100%; border-radius: 0; }
    .img-caption {
      font-size: 13px;
      color: var(--muted);
      margin: 6px 0 0;
      line-height: 1.4;
    }

    /* Cards */
    .card {
      background: var(--surface);
      border: 1px solid var(--line);
      border-radius: var(--radius);
      padding: 16px;
      margin: 14px 0;
      box-shadow: var(--shadow);
    }
    .card-title {
      font-size: 14px;
      font-weight: 650;
      margin: 0 0 10px;
      color: var(--text);
    }
    .card-note {
      margin: 0 0 12px;
      font-size: 14px;
      color: var(--muted);
    }

    /* Buttons */
    .btn {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      width: 100%;
      min-height: var(--tap);
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      font-weight: 650;
      font-size: 15px;
      text-decoration: none;
      border: 1px solid transparent;
      cursor: pointer;
      margin: 0 0 8px;
      transition: background .15s ease, border-color .15s ease, transform .05s ease;
      -webkit-tap-highlight-color: transparent;
      font-family: inherit;
    }
    .btn:active { transform: scale(0.98); }
    .btn:last-child { margin-bottom: 0; }
    .btn-primary {
      background: var(--accent);
      color: #fff;
      box-shadow: 0 1px 0 rgba(255,255,255,.15) inset;
    }
    .btn-primary:hover { background: var(--accent-hover); text-decoration: none; color: #fff; }
    .btn-secondary {
      background: var(--surface);
      color: var(--text);
      border-color: var(--line);
    }
    .btn-secondary:hover { background: #f9fafb; text-decoration: none; color: var(--text); }
    .btn-soft {
      background: #f3f4f6;
      color: var(--text);
      font-weight: 550;
      min-height: 44px;
      font-size: 14px;
    }
    .btn-soft:hover { background: #e5e7eb; text-decoration: none; color: var(--text); }
    .btn-row {
      display: grid;
      grid-template-columns: 1fr;
      gap: 8px;
    }
    .btn-row .btn { margin: 0; }

    /* Article */
    article { margin-top: 8px; }
    article h2 {
      font-size: 1.15rem;
      margin: 28px 0 10px;
      letter-spacing: -0.01em;
      line-height: 1.3;
    }
    article p { margin: 0 0 12px; }
    article ol, article ul {
      margin: 0 0 14px;
      padding-left: 1.25em;
    }
    article li { margin: 6px 0; }
    article img {
      margin: 12px 0 4px;
      border: 1px solid var(--line);
      box-shadow: var(--shadow);
    }

    .trust-badge {
      background: #ecfdf5;
      border: 1px solid #a7f3d0;
      border-radius: var(--radius-sm);
      padding: 12px 14px;
      margin: 0 0 14px;
      font-size: 14px;
      line-height: 1.45;
      color: #065f46;
    }
    .trust-badge strong { color: #047857; }
    .dl-count {
      display: inline-flex;
      align-items: baseline;
      gap: 6px;
      margin: 8px 0 0;
      font-size: 14px;
      color: #374151;
    }
    .dl-count b { font-variant-numeric: tabular-nums; color: #047857; font-size: 16px; }
    .platform-row {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 10px;
    }
    .platform-row span {
      font-size: 12px;
      color: var(--muted);
      background: #f3f4f6;
      padding: 4px 10px;
      border-radius: 999px;
    }
    .mid-cta { margin: 22px 0; }
    /* Direct answer for AI / featured snippets */
    .ai-answer {
      background: #eff6ff;
      border: 1px solid #bfdbfe;
      border-left: 4px solid #1d4ed8;
      border-radius: var(--radius-sm);
      padding: 14px 16px;
      margin: 0 0 18px;
      font-size: 15px;
      line-height: 1.55;
    }
    .ai-answer strong { color: #1e3a8a; }
    .ai-answer p { margin: 0 0 8px; }
    .ai-answer p:last-child { margin: 0; }

    /* FAQ */
    .faq details {
      background: var(--surface);
      border: 1px solid var(--line);
      border-radius: var(--radius-sm);
      padding: 0 14px;
      margin: 8px 0;
    }
    .faq summary {
      cursor: pointer;
      font-weight: 600;
      padding: 14px 0;
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 12px;
    }
    .faq summary::-webkit-details-marker { display: none; }
    .faq summary::after {
      content: "+";
      font-weight: 400;
      color: var(--muted);
      font-size: 18px;
      line-height: 1;
    }
    .faq details[open] summary::after { content: "–"; }
    .faq details p {
      margin: 0 0 14px;
      color: #374151;
      font-size: 15px;
    }

    /* Related */
    .related {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .related a {
      display: inline-flex;
      align-items: center;
      padding: 8px 12px;
      background: var(--surface);
      border: 1px solid var(--line);
      border-radius: 999px;
      font-size: 13px;
      color: var(--text);
      text-decoration: none;
    }
    .related a:hover {
      border-color: #cbd5e1;
      background: #f8fafc;
    }

    /* Footer */
    .site-footer {
      margin-top: 36px;
      padding-top: 18px;
      border-top: 1px solid var(--line);
      font-size: 13px;
      color: var(--muted);
      line-height: 1.5;
    }
    .site-footer p { margin: 0 0 8px; }

    /* Sticky mobile CTA */
    .sticky-cta {
      display: none;
      position: fixed;
      left: 0;
      right: 0;
      bottom: 0;
      padding: 10px 16px calc(10px + env(safe-area-inset-bottom));
      background: color-mix(in srgb, var(--surface) 90%, transparent);
      backdrop-filter: blur(10px);
      border-top: 1px solid var(--line);
      z-index: 30;
    }
    .sticky-cta .btn { margin: 0; }
    .send-form { display: grid; gap: 8px; margin-top: 10px; }
    .send-form input {
      min-height: 46px; padding: 10px 12px; border: 1px solid var(--line);
      border-radius: 10px; font: inherit; background: #fff;
    }
    .send-form .status { font-size: 13px; color: var(--muted); min-height: 1.2em; }
    .send-form .status.ok { color: #047857; }
    .send-form .status.err { color: #b91c1c; }
    .hp { position: absolute; left: -9999px; height: 0; overflow: hidden; }

    @media (max-width: 719px) {
      .sticky-cta { display: block; }
      body { padding-bottom: 72px; }
    }
    @media (min-width: 720px) {
      .sticky-cta { display: block; max-width: var(--max); margin: 0 auto; left: 0; right: 0; border-radius: 12px 12px 0 0; }
      body { padding-bottom: 80px; }
    }

    /* Tablet / desktop */
    @media (min-width: 600px) {
      body { font-size: 17px; }
      .wrap { padding: 0 24px 64px; }
      .btn-row {
        grid-template-columns: 1fr 1fr;
      }
      .btn-row .btn-primary {
        grid-column: 1 / -1;
      }
      .card { padding: 18px 20px; }
    }

    @media (min-width: 900px) {
      .site-header { padding-top: 18px; }
    }

    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      .btn { transition: none; }
    }