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

    :root {
      --primary: hsl(216, 98%, 22%);
      --primary-fg: hsl(0, 0%, 100%);
      --accent: hsl(42, 51%, 61%);
      --accent-fg: hsl(216, 98%, 22%);
      --accent-hover: hsl(42, 45%, 52%);
      --bg: hsl(210, 20%, 98%);
      --card: hsl(0, 0%, 100%);
      --foreground: hsl(216, 98%, 22%);
      --muted: hsl(215, 16%, 47%);
      --border: hsl(214, 20%, 88%);
      --secondary: hsl(210, 15%, 95%);
      --font-heading: 'League Spartan', sans-serif;
      --font-body: 'Arimo', sans-serif;
      --radius: 0.5rem;
      --max-w: 80rem;
    }

    html { font-size: 16px; scroll-behavior: smooth; }
    body { font-family: var(--font-body); background: var(--bg); color: var(--foreground); line-height: 1.6; }

    /* ── HEADER ── */
    .site-header {
      position: sticky; top: 0; z-index: 50;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border);
    }
    .header-inner {
      max-width: var(--max-w); margin: 0 auto;
      padding: 0 1.5rem;
      display: flex; align-items: center; justify-content: space-between;
      height: 4rem;
    }
    @media (min-width: 1024px) { .header-inner { height: 5rem; } }
    .header-logo img { height: 3rem; width: auto; display: block; }
    @media (min-width: 1024px) { .header-logo img { height: 3.5rem; } }

    .main-nav { display: none; gap: 0.25rem; align-items: center; }
    @media (min-width: 1024px) { .main-nav { display: flex; } }

    .nav-link {
      padding: 0.5rem 1rem; border-radius: var(--radius);
      font-size: 0.875rem; font-weight: 500;
      color: var(--foreground); text-decoration: none;
      transition: background 0.15s;
    }
    .nav-link:hover { background: var(--secondary); }
    .nav-link.active { color: var(--accent); }

    .btn-cta {
      margin-left: 1rem;
      background: var(--accent); color: var(--accent-fg);
      padding: 0.625rem 1.25rem; border-radius: var(--radius);
      font-size: 0.875rem; font-weight: 600;
      text-decoration: none;
      box-shadow: 0 1px 3px rgba(0,0,0,0.15);
      transition: background 0.15s, box-shadow 0.15s;
    }
    .btn-cta:hover { background: var(--accent-hover); box-shadow: 0 4px 12px rgba(0,0,0,0.15); }

    /* ── HERO DO POST ── */
    .post-hero {
      background: var(--primary);
      padding: 3rem 1.5rem 2.5rem;
    }
    @media (min-width: 1024px) { .post-hero { padding: 4rem 1.5rem 3rem; } }
    .post-hero-inner { max-width: 52rem; margin: 0 auto; }

    .post-category {
      display: inline-block;
      background: var(--accent); color: var(--accent-fg);
      font-size: 0.75rem; font-weight: 700; letter-spacing: 0.08em;
      text-transform: uppercase; padding: 0.25rem 0.75rem;
      border-radius: 9999px; margin-bottom: 1rem;
      font-family: var(--font-heading);
    }
    .post-title {
      font-family: var(--font-heading);
      font-size: 1.875rem; font-weight: 700; line-height: 1.2;
      color: var(--primary-fg);
    }
    @media (min-width: 768px) { .post-title { font-size: 2.5rem; } }
    @media (min-width: 1024px) { .post-title { font-size: 3rem; } }

    .post-meta {
      margin-top: 1rem;
      display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
      font-size: 0.875rem; color: rgba(255,255,255,0.7);
    }
    .post-meta time { font-weight: 500; }
    .post-meta-dot { opacity: 0.4; }

    /* ── ARTICLE LAYOUT ── */
    .article-wrap {
      max-width: var(--max-w); margin: 0 auto;
      padding: 2rem 1.5rem 4rem;
      display: grid; gap: 3rem;
      grid-template-columns: 1fr;
    }
    @media (min-width: 1024px) {
      .article-wrap { grid-template-columns: 1fr 320px; padding: 3rem 2rem 5rem; }
    }

    /* ── POST CONTENT ── */
    .post-featured-img {
      width: 100%; border-radius: var(--radius);
      overflow: hidden; margin-bottom: 2rem;
      box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    }
    .post-featured-img img { width: 100%; height: auto; display: block; aspect-ratio: 16/9; object-fit: cover; }

    .post-body h2 {
      font-family: var(--font-heading);
      font-size: 1.375rem; font-weight: 700;
      color: var(--foreground); margin: 2rem 0 0.75rem;
    }
    .post-body h3 {
      font-family: var(--font-heading);
      font-size: 1.125rem; font-weight: 600;
      color: var(--foreground); margin: 1.5rem 0 0.5rem;
    }
    .post-body p { margin-bottom: 1.25rem; color: var(--foreground); opacity: 0.85; }
    .post-body ul, .post-body ol { margin: 0 0 1.25rem 1.5rem; }
    .post-body li { margin-bottom: 0.4rem; opacity: 0.85; }
    .post-body strong { font-weight: 600; color: var(--foreground); opacity: 1; }

    .post-body .highlight-box {
      background: var(--secondary); border-left: 4px solid var(--accent);
      padding: 1rem 1.25rem; border-radius: 0 var(--radius) var(--radius) 0;
      margin: 1.5rem 0;
    }
    .post-body .highlight-box p { margin: 0; }

    /* ── SIDEBAR ── */
    .sidebar { display: flex; flex-direction: column; gap: 1.5rem; }

    .sidebar-card {
      background: var(--card); border: 1px solid var(--border);
      border-radius: calc(var(--radius) * 1.5);
      padding: 1.5rem; box-shadow: 0 1px 4px rgba(0,0,0,0.05);
    }
    .sidebar-card h3 {
      font-family: var(--font-heading);
      font-size: 0.875rem; font-weight: 700;
      text-transform: uppercase; letter-spacing: 0.08em;
      color: var(--muted); margin-bottom: 1rem;
    }

    .cta-card {
      background: var(--primary); border-color: var(--primary);
      text-align: center;
    }
    .cta-card h3 { color: rgba(255,255,255,0.6); }
    .cta-card p { font-size: 0.9rem; color: rgba(255,255,255,0.8); margin-bottom: 1.25rem; line-height: 1.5; }
    .cta-card .btn-cta { display: inline-block; font-size: 0.875rem; }

    .related-list { list-style: none; }
    .related-list li { border-bottom: 1px solid var(--border); padding: 0.6rem 0; }
    .related-list li:last-child { border-bottom: none; padding-bottom: 0; }
    .related-list a {
      font-size: 0.875rem; color: var(--foreground);
      text-decoration: none; font-weight: 500;
      transition: color 0.15s;
    }
    .related-list a:hover { color: var(--accent); }
    .related-list span { display: block; font-size: 0.75rem; color: var(--muted); margin-top: 0.15rem; }

    .contact-list { list-style: none; display: flex; flex-direction: column; gap: 0.6rem; }
    .contact-list li { font-size: 0.875rem; display: flex; gap: 0.5rem; align-items: flex-start; }
    .contact-list a { color: var(--foreground); text-decoration: none; }
    .contact-list a:hover { color: var(--accent); }
    .contact-icon { color: var(--accent); flex-shrink: 0; margin-top: 2px; }

    /* ── BREADCRUMB ── */
    .breadcrumb {
      max-width: var(--max-w); margin: 0 auto;
      padding: 0.875rem 1.5rem 0;
      font-size: 0.8125rem; color: var(--muted);
      display: flex; gap: 0.4rem; flex-wrap: wrap; align-items: center;
    }
    .breadcrumb a { color: var(--muted); text-decoration: none; }
    .breadcrumb a:hover { color: var(--accent); }
    .breadcrumb-sep { opacity: 0.5; }

    /* ── BACK LINK ── */
    .back-to-blog {
      display: inline-flex; align-items: center; gap: 0.4rem;
      color: var(--accent); text-decoration: none;
      font-size: 0.875rem; font-weight: 600;
      margin-bottom: 1.5rem;
      transition: gap 0.15s;
    }
    .back-to-blog:hover { gap: 0.6rem; }

    /* ── FOOTER ── */
    .site-footer { background: var(--primary); color: var(--primary-fg); padding: 3rem 1.5rem 2rem; }
    .footer-inner { max-width: var(--max-w); margin: 0 auto; }
    .footer-grid {
      display: grid; gap: 2.5rem;
      grid-template-columns: 1fr;
    }
    @media (min-width: 768px) { .footer-grid { grid-template-columns: repeat(2, 1fr); } }
    @media (min-width: 1024px) { .footer-grid { grid-template-columns: repeat(4, 1fr); } }

    .footer-logo img { height: 3.5rem; width: auto; }
    .footer-tagline { margin-top: 0.75rem; font-size: 0.875rem; color: rgba(255,255,255,0.6); line-height: 1.6; }

    .footer-col h4 {
      font-size: 0.75rem; font-weight: 700;
      text-transform: uppercase; letter-spacing: 0.1em;
      color: rgba(255,255,255,0.5); margin-bottom: 0.75rem;
      font-family: var(--font-heading);
    }
    .footer-links { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }
    .footer-links a { font-size: 0.875rem; color: rgba(255,255,255,0.75); text-decoration: none; transition: color 0.15s; }
    .footer-links a:hover { color: var(--accent); }

    .footer-contact { list-style: none; display: flex; flex-direction: column; gap: 0.75rem; }
    .footer-contact li { display: flex; gap: 0.5rem; align-items: flex-start; font-size: 0.875rem; color: rgba(255,255,255,0.75); }
    .footer-contact a { color: inherit; text-decoration: none; transition: color 0.15s; }
    .footer-contact a:hover { color: var(--accent); }
    .fi { color: var(--accent); flex-shrink: 0; margin-top: 2px; }

    .social-row { display: flex; gap: 0.75rem; margin-top: 0.5rem; }
    .social-btn {
      width: 2.5rem; height: 2.5rem; border-radius: 9999px;
      background: rgba(255,255,255,0.1);
      display: flex; align-items: center; justify-content: center;
      transition: background 0.15s;
      color: var(--primary-fg);
    }
    .social-btn:hover { background: var(--accent); color: var(--accent-fg); }
    .social-btn svg { width: 1.1rem; height: 1.1rem; }

    .footer-bottom {
      margin-top: 2.5rem; padding-top: 1.5rem;
      border-top: 1px solid rgba(255,255,255,0.1);
      text-align: center; font-size: 0.75rem;
      color: rgba(255,255,255,0.4);
    }

    /* ── WHATSAPP FAB ── */
    .wa-fab {
      position: fixed; bottom: 1.5rem; right: 1.5rem; z-index: 50;
      width: 3.5rem; height: 3.5rem; border-radius: 9999px;
      background: #25D366; display: flex; align-items: center; justify-content: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.2);
      transition: transform 0.2s;
    }
    .wa-fab:hover { transform: scale(1.1); }
    .wa-fab svg { width: 1.75rem; height: 1.75rem; fill: white; }