/* ===== QR CODE GUIDE — Global Stylesheet ===== */
/* Brand: Primary #1A56DB | Accent #0E9F6E | BG #F9FAFB | Text #111827 */

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

:root{
  --primary:#1A56DB;--accent:#0E9F6E;--bg:#F9FAFB;--text:#111827;
  --text-secondary:#374151;--text-muted:#6B7280;--border:#E5E7EB;
  --surface:#FFFFFF;--blue-light:#EFF6FF;--green-light:#F0FDF4;
  --yellow-light:#FFFBEB;--max-w:1200px;--content-w:780px;
  --radius:8px;--shadow:0 1px 3px rgba(0,0,0,.1),0 1px 2px rgba(0,0,0,.06);
  --shadow-lg:0 10px 15px -3px rgba(0,0,0,.1),0 4px 6px -2px rgba(0,0,0,.05);
}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  font-size:17px;line-height:1.75;color:var(--text-secondary);
  background:var(--bg);-webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none;transition:color .2s}
a:hover{color:#1442ad;text-decoration:underline}

/* ===== HEADER ===== */
.site-header{
  position:sticky;top:0;z-index:100;background:var(--surface);
  border-bottom:1px solid var(--border);backdrop-filter:blur(10px);
  background:rgba(255,255,255,.95);
}
.header-inner{
  max-width:var(--max-w);margin:0 auto;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;height:64px;
}
.logo{font-size:1.25rem;font-weight:800;color:var(--text);display:flex;align-items:center;gap:8px}
.logo-icon{width:32px;height:32px;background:var(--primary);border-radius:6px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:14px;font-weight:700}
.nav-links{display:flex;gap:24px;list-style:none}
.nav-links a{color:var(--text-secondary);font-size:15px;font-weight:500;padding:8px 0;position:relative}
.nav-links a:hover{color:var(--primary);text-decoration:none}
.nav-links a::after{content:'';position:absolute;bottom:0;left:0;width:0;height:2px;background:var(--primary);transition:width .2s}
.nav-links a:hover::after{width:100%}

/* Hamburger */
.menu-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px}
.menu-toggle span{display:block;width:24px;height:2px;background:var(--text);margin:5px 0;transition:.3s}
#menu-state{display:none}

/* ===== LAYOUT ===== */
.page-wrapper{max-width:var(--max-w);margin:0 auto;padding:32px 24px;display:flex;gap:40px}
.content-area{flex:1;min-width:0;max-width:var(--content-w)}
.sidebar{width:280px;flex-shrink:0}
.sidebar-inner{position:sticky;top:88px;display:flex;flex-direction:column;gap:24px}

/* ===== BREADCRUMB ===== */
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:14px;color:var(--text-muted);margin-bottom:24px;flex-wrap:wrap}
.breadcrumb a{color:var(--text-muted);font-weight:500}.breadcrumb a:hover{color:var(--primary)}
.breadcrumb .sep{color:var(--border)}
.breadcrumb .current{color:var(--text-secondary);font-weight:600}

/* ===== ARTICLE HEADER ===== */
.article-header{margin-bottom:32px}
.article-header h1{
  font-size:2.2rem;font-weight:800;color:var(--text);line-height:1.25;margin-bottom:16px;
}
.author-block{display:flex;align-items:center;gap:12px;padding:16px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border);margin-bottom:24px}
.author-avatar{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:18px;flex-shrink:0}
.author-info{font-size:14px;line-height:1.5}
.author-name{font-weight:700;color:var(--text)}
.author-title{color:var(--text-muted)}
.article-meta{display:flex;gap:16px;color:var(--text-muted);font-size:13px;margin-top:4px}
.article-meta span{display:flex;align-items:center;gap:4px}

/* ===== QUICK ANSWER BOX ===== */
.quick-answer{
  background:var(--blue-light);border-left:4px solid var(--primary);
  padding:20px 24px;border-radius:var(--radius);margin-bottom:32px;
}
.quick-answer-label{font-size:13px;font-weight:700;color:var(--primary);text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px}
.quick-answer p{color:var(--text);font-size:16px;line-height:1.7;margin:0}

/* ===== TOC ===== */
.toc-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:20px 24px;box-shadow:var(--shadow);
}
.toc-card h2,.toc-card summary{font-size:15px;font-weight:700;color:var(--text);margin-bottom:12px;display:flex;align-items:center;gap:8px}
.toc-list{list-style:none;counter-reset:toc}
.toc-list li{counter-increment:toc}
.toc-list li a{
  display:flex;align-items:baseline;gap:8px;padding:6px 0;font-size:14px;
  color:var(--text-secondary);border-bottom:1px solid #f3f4f6;transition:all .2s;
}
.toc-list li a::before{content:counter(toc,decimal-leading-zero);font-size:12px;font-weight:700;color:var(--primary);min-width:20px}
.toc-list li a:hover{color:var(--primary);text-decoration:none;padding-left:4px}
.toc-list li:last-child a{border-bottom:none}

/* ===== CONTENT TYPOGRAPHY ===== */
.content-body h2{
  font-size:1.6rem;font-weight:700;color:#1F2937;
  border-left:4px solid var(--primary);padding-left:12px;
  margin:48px 0 20px;line-height:1.3;
}
.content-body h3{font-size:1.2rem;font-weight:600;color:var(--text-secondary);margin:32px 0 12px}
.content-body p{margin-bottom:16px}
.content-body ul,.content-body ol{margin:0 0 16px 24px}
.content-body li{margin-bottom:8px}
.content-body strong{color:var(--text)}

/* ===== CALLOUT BOXES ===== */
.callout{padding:16px 20px;border-radius:var(--radius);margin:24px 0;border-left:4px solid}
.callout-title{font-weight:700;font-size:14px;margin-bottom:6px;display:flex;align-items:center;gap:6px}
.callout p{margin:0;font-size:15px}
.callout-tip{background:var(--green-light);border-color:var(--accent)}.callout-tip .callout-title{color:#065f46}
.callout-warning{background:var(--yellow-light);border-color:#F59E0B}.callout-warning .callout-title{color:#92400e}
.callout-note{background:var(--blue-light);border-color:var(--primary)}.callout-note .callout-title{color:var(--primary)}

/* ===== COMPARISON TABLE ===== */
.table-wrapper{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:24px 0;border-radius:var(--radius);border:1px solid var(--border)}
.comparison-table{width:100%;border-collapse:collapse;font-size:15px;min-width:500px}
.comparison-table thead{background:var(--primary);color:#fff;position:sticky;top:0}
.comparison-table th{padding:12px 16px;text-align:left;font-weight:600;font-size:14px}
.comparison-table td{padding:12px 16px;border-bottom:1px solid var(--border)}
.comparison-table tbody tr:nth-child(even){background:#f9fafb}
.comparison-table tbody tr:hover{background:var(--blue-light)}

/* ===== STEP GUIDE ===== */
.step-list{counter-reset:steps;list-style:none;margin:24px 0;padding:0}
.step-list li{counter-increment:steps;display:flex;gap:16px;margin-bottom:20px;padding:16px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius)}
.step-list li::before{
  content:counter(steps);min-width:36px;height:36px;background:var(--primary);
  color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-weight:700;font-size:14px;flex-shrink:0;margin-top:2px;
}

/* ===== FAQ ACCORDION ===== */
.faq-section{margin:48px 0}
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:8px;overflow:hidden;background:var(--surface)}
.faq-item summary{
  padding:16px 20px;font-weight:600;color:var(--text);cursor:pointer;
  display:flex;justify-content:space-between;align-items:center;
  list-style:none;font-size:16px;transition:background .2s;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'+';font-size:20px;font-weight:300;color:var(--text-muted);transition:transform .2s;min-width:24px;text-align:center}
.faq-item[open] summary::after{content:'−'}
.faq-item[open] summary{background:var(--blue-light);color:var(--primary)}
.faq-answer{padding:0 20px 16px;font-size:15px;line-height:1.7;color:var(--text-secondary)}

/* ===== KEY TAKEAWAYS ===== */
.takeaways{
  background:linear-gradient(135deg,#1a56db 0%,#0e9f6e 100%);
  border-radius:var(--radius);padding:28px 32px;margin:48px 0;color:#fff;
}
.takeaways h2{color:#fff;border:none;padding:0;margin:0 0 16px;font-size:1.3rem}
.takeaways ul{list-style:none;margin:0;padding:0}
.takeaways li{padding:8px 0 8px 28px;position:relative;font-size:15px;border-bottom:1px solid rgba(255,255,255,.15)}
.takeaways li:last-child{border-bottom:none}
.takeaways li::before{content:'✓';position:absolute;left:0;color:#86efac;font-weight:700}

/* ===== RELATED GUIDES ===== */
.related-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin:24px 0}
.related-card{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:20px;transition:all .2s;display:flex;flex-direction:column;
}
.related-card:hover{border-color:var(--primary);box-shadow:var(--shadow-lg);transform:translateY(-2px);text-decoration:none}
.related-card h3{font-size:15px;font-weight:600;color:var(--text);margin:0 0 6px;display:flex;align-items:center;gap:6px}
.related-card h3::after{content:'→';color:var(--primary);transition:transform .2s}
.related-card:hover h3::after{transform:translateX(4px)}
.related-card p{font-size:13px;color:var(--text-muted);margin:0;line-height:1.5}

/* ===== AUTHOR BIO ===== */
.author-bio{
  background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  padding:24px;display:flex;gap:20px;margin:48px 0;
}
.author-bio-avatar{width:80px;height:80px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent));display:flex;align-items:center;justify-content:center;color:#fff;font-size:28px;font-weight:700;flex-shrink:0}
.author-bio-content h3{font-size:18px;font-weight:700;color:var(--text);margin-bottom:4px}
.author-bio-content .credentials{font-size:13px;color:var(--primary);font-weight:600;margin-bottom:8px}
.author-bio-content p{font-size:14px;margin-bottom:8px}
.fact-check{font-size:13px;color:var(--text-muted);border-top:1px solid var(--border);padding-top:8px;margin-top:8px}

/* ===== SIDEBAR CARDS ===== */
.sidebar-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.sidebar-card h3{font-size:14px;font-weight:700;color:var(--text);margin-bottom:12px;text-transform:uppercase;letter-spacing:.3px}
.sidebar-links{list-style:none;padding:0;margin:0}
.sidebar-links li{margin-bottom:6px}
.sidebar-links a{font-size:14px;display:block;padding:6px 8px;border-radius:4px;color:var(--text-secondary);transition:all .15s}
.sidebar-links a:hover{background:var(--blue-light);color:var(--primary);text-decoration:none;padding-left:12px}

/* ===== FOOTER ===== */
.site-footer{background:var(--text);color:#d1d5db;padding:48px 24px 24px;margin-top:64px}
.footer-inner{max-width:var(--max-w);margin:0 auto;display:flex;justify-content:space-between;flex-wrap:wrap;gap:24px}
.footer-brand{max-width:300px}
.footer-brand .logo{color:#fff;margin-bottom:8px}
.footer-brand p{font-size:13px;line-height:1.6;color:#9ca3af}
.footer-links{display:flex;gap:32px}
.footer-links a{color:#d1d5db;font-size:14px;transition:color .2s}
.footer-links a:hover{color:#fff;text-decoration:none}
.footer-bottom{max-width:var(--max-w);margin:24px auto 0;padding-top:24px;border-top:1px solid #374151;display:flex;justify-content:space-between;font-size:13px;color:#6b7280;flex-wrap:wrap;gap:8px}

/* ===== MOBILE ===== */
@media(max-width:768px){
  .menu-toggle{display:block}
  .nav-links{
    display:none;position:absolute;top:64px;left:0;right:0;
    background:var(--surface);flex-direction:column;padding:16px 24px;
    border-bottom:1px solid var(--border);box-shadow:var(--shadow-lg);gap:4px;
  }
  #menu-state:checked ~ .nav-links{display:flex}
  .nav-links a{padding:12px 0;font-size:16px}
  .page-wrapper{flex-direction:column;padding:20px 16px}
  .sidebar{width:100%;order:2}
  .sidebar-inner{position:static}
  .content-area{max-width:100%}
  body{font-size:16px}
  .article-header h1{font-size:1.7rem}
  .content-body h2{font-size:1.35rem}
  .related-grid{grid-template-columns:1fr}
  .author-bio{flex-direction:column;align-items:center;text-align:center}
  .footer-inner{flex-direction:column}
  .footer-bottom{flex-direction:column;text-align:center}
  .toc-desktop{display:none}
  .toc-mobile{display:block}
}
@media(min-width:769px){
  .toc-mobile{display:none}
  .toc-desktop{display:block}
}