*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#f7f9fc;--surface:#fff;--surface-2:#f9fafb;--surface-3:#eff6ff;
  --border:#e5e7eb;--text:#111827;--muted:#4b5563;--dim:#6b7280;--soft:#9ca3af;
  --accent:#2563eb;--accent-dark:#1d4ed8;--accent-soft:#e0ecff;
  --success:#16a34a;--success-soft:#dcfce7;
  --radius:18px;--shadow:0 10px 30px rgba(15,23,42,.04);
  --sans:Inter,Arial,sans-serif
}
html{scroll-behavior:smooth;overflow-x:hidden}
body{background:var(--bg);color:var(--text);font-family:var(--sans);
  font-size:15px;line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img,table,pre,iframe,video,canvas{max-width:100%}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--accent-dark);text-decoration:underline}

    /* ── Header ─────────────────────────────────────────────────────────── */
    .site-header{background:rgba(255,255,255,.94);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:20;backdrop-filter:blur(10px)}
    .nav-wrap{max-width:1120px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;justify-content:space-between;gap:18px}
    .brand{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:800;letter-spacing:-.03em;font-size:20px;text-decoration:none}
    .brand:hover{text-decoration:none;color:var(--text)}
    .brand-mark{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,var(--accent),#60a5fa);display:grid;place-items:center;color:#fff;font-weight:800;box-shadow:0 10px 20px rgba(37,99,235,.18)}
    .top-nav{display:flex;align-items:center;gap:18px;font-size:14px;font-weight:600}
    .top-nav a{color:var(--muted)}
    .top-nav a:hover{color:var(--accent)}
    .menu-btn{display:none;background:none;border:none;cursor:pointer;padding:8px;color:var(--text);border-radius:8px;line-height:1}

    /* ── Mobile nav ─────────────────────────────────────────────────────── */
    .mobile-nav{visibility:hidden;pointer-events:none;position:fixed;top:0;left:0;right:0;bottom:0;z-index:9999}
    .mobile-nav.open{visibility:visible;pointer-events:auto}
    .mobile-nav-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:rgba(15,23,42,.5)}
    .mobile-nav-panel{position:absolute;top:0;right:0;width:280px;max-width:85vw;height:100%;background:#fff;box-shadow:-4px 0 24px rgba(15,23,42,.15);display:flex;flex-direction:column;overflow-y:auto;transform:translateX(100%);transition:transform .25s ease}
    .mobile-nav.open .mobile-nav-panel{transform:translateX(0)}
    .mobile-nav-head{display:flex;align-items:center;justify-content:space-between;padding:18px 20px;border-bottom:1px solid var(--border);background:#fff}
    .mobile-nav-head strong{font-weight:800;font-size:16px;color:var(--text)}
    .mobile-nav-close{background:none;border:none;cursor:pointer;color:var(--dim);padding:6px;border-radius:8px;line-height:1;font-size:22px}
    .mobile-nav-links{flex:1}
    .mobile-nav-links a{display:block;padding:15px 20px;font-size:15px;font-weight:600;color:var(--text);border-bottom:1px solid var(--border);text-decoration:none}
    .mobile-nav-links a:active{background:var(--surface-2)}
    .mobile-nav-footer{padding:16px 20px;border-top:1px solid var(--border);font-size:12px;color:var(--dim)}

    /* ── Main ───────────────────────────────────────────────────────────── */
    .main{max-width:1120px;margin:0 auto;padding:20px 20px 70px}
    .breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:7px;color:var(--dim);font-size:13px;margin-bottom:18px}
    .breadcrumb a{color:var(--dim)}
    .breadcrumb a:hover{color:var(--accent)}

    /* ── Hero ───────────────────────────────────────────────────────────── */
    .hero{background:var(--surface);border:1px solid var(--border);border-radius:24px;box-shadow:var(--shadow);padding:28px 32px;margin-bottom:28px}
    .eyebrow{display:inline-flex;align-items:center;gap:8px;padding:5px 10px;border-radius:999px;background:var(--success-soft);color:var(--success);font-size:12px;font-weight:700;margin-bottom:10px}
    h1{font-size:clamp(26px,3.8vw,44px);max-width:100%;margin-bottom:10px;letter-spacing:-.035em;line-height:1.15}
    .hero-subtitle{color:var(--muted);font-size:15px;line-height:1.6;max-width:640px;margin-bottom:20px}
    .hero-meta{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
    .stat-pill{display:inline-flex;align-items:center;gap:6px;background:var(--surface-2);border:1px solid var(--border);border-radius:999px;padding:5px 12px;font-size:13px;font-weight:600;color:var(--muted)}

    /* ── Filter bar ─────────────────────────────────────────────────────── */
    .filter-bar{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:24px}
    .filter-btn{padding:7px 14px;border-radius:999px;border:1px solid var(--border);background:var(--surface);font-size:13px;font-weight:600;color:var(--muted);cursor:pointer;transition:all .12s ease;font-family:var(--sans)}
    .filter-btn:hover{border-color:var(--accent);color:var(--accent)}
    .filter-btn.active{background:var(--accent);border-color:var(--accent);color:#fff}

    /* ── Page layout ────────────────────────────────────────────────────── */
    .page-layout{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;align-items:start}

    /* ── Article grid ───────────────────────────────────────────────────── */
    .article-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}

    /* ── Article card ───────────────────────────────────────────────────── */
    .article-card{background:var(--surface);border:1px solid var(--border);border-radius:18px;overflow:hidden;display:flex;flex-direction:column;transition:border-color .15s ease,box-shadow .15s ease;text-decoration:none;min-width:0}
    .article-card:hover{border-color:var(--accent);box-shadow:0 8px 24px rgba(37,99,235,.1);text-decoration:none}
    .article-card-body{padding:22px 24px;flex:1;display:flex;flex-direction:column;gap:10px}
    .article-tag{display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--success);background:var(--success-soft);border-radius:999px;padding:3px 10px}
    .article-card h2{font-size:17px;font-weight:800;color:var(--text);line-height:1.3;letter-spacing:-.02em;margin:0}
    .article-card p{font-size:14px;color:var(--muted);line-height:1.6;margin:0;flex:1}
    .article-meta{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-top:4px}
    .article-meta span{font-size:12px;color:var(--dim)}
    .read-link{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:700;color:var(--accent);margin-top:6px}
    .read-link:hover{color:var(--accent-dark);text-decoration:none}

    /* ── Featured card ──────────────────────────────────────────────────── */
    .article-card.featured{grid-column:span 2}
    .article-card.featured .article-card-body{padding:26px 28px}
    .article-card.featured h2{font-size:22px}
    .article-card.featured p{font-size:15px;max-width:680px}

    /* ── Sidebar ─────────────────────────────────────────────────────────── */
    .sidebar{display:flex;flex-direction:column;gap:16px}
    .sidebar-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}
    .sidebar-card h3{font-size:16px;font-weight:800;margin-bottom:12px;color:var(--text)}
    .sidebar-link-list{display:flex;flex-direction:column;gap:0}
    .sidebar-link-list a{display:flex;align-items:center;justify-content:space-between;padding:10px 0;font-size:14px;font-weight:600;color:var(--text);border-bottom:1px solid var(--border);text-decoration:none;gap:8px}
    .sidebar-link-list a:last-child{border-bottom:0;padding-bottom:0}
    .sidebar-link-list a:hover{color:var(--accent);text-decoration:none}
    .sidebar-link-list .arr{color:var(--soft);font-size:13px}
    .topic-pills{display:flex;flex-wrap:wrap;gap:8px}
    .topic-pill{display:inline-block;padding:5px 12px;border-radius:999px;border:1px solid var(--border);background:var(--surface-2);font-size:13px;font-weight:600;color:var(--muted);text-decoration:none;transition:all .12s ease}
    .topic-pill:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-soft);text-decoration:none}
    .cta-card{background:linear-gradient(135deg,#064e3b,#065f46);border-radius:var(--radius);padding:20px;color:#fff}
    .cta-card h3{color:#fff;font-size:16px;margin-bottom:8px}
    .cta-card p{color:#a7f3d0;font-size:13px;margin-bottom:14px;line-height:1.5}
    .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 18px;border-radius:12px;font-size:14px;font-weight:700;cursor:pointer;border:none;text-decoration:none;transition:all .15s ease}
    .btn-white{background:#fff;color:#065f46}
    .btn-white:hover{background:#ecfdf5;text-decoration:none;color:#065f46}
    .btn-full{width:100%;box-sizing:border-box;justify-content:center}
    .btn-accent{background:var(--accent);color:#fff;width:100%;box-sizing:border-box;justify-content:center;display:flex}
    .btn-accent:hover{background:var(--accent-dark);text-decoration:none;color:#fff}

    /* ── Footer ─────────────────────────────────────────────────────────── */
    .footer{border-top:1px solid var(--border);background:#fff;padding:40px 20px 24px;margin-top:40px}
    .footer-inner{max-width:1120px;margin:0 auto}
    .footer-cols{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:32px;margin-bottom:32px}
    .footer-col h4{font-size:11px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--dim);margin-bottom:12px}
    .footer-col ul{list-style:none;display:flex;flex-direction:column;gap:8px}
    .footer-col ul li a{color:var(--muted);font-size:13px;font-weight:600;transition:color .12s ease}
    .footer-col ul li a:hover{color:var(--accent);text-decoration:none}
    .footer-base{border-top:1px solid var(--border);padding-top:20px;color:var(--dim);font-size:12px}

    /* ── Responsive ─────────────────────────────────────────────────────── */
    @media(max-width:980px){
      .page-layout{display:flex;flex-direction:column}
      .sidebar-top{order:-1;width:100%}
      .sidebar-bottom{order:2;width:100%}
      .article-card.featured{grid-column:span 1}
      .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
    }
    @media(max-width:760px){
      .top-nav{display:none}
      .menu-btn{display:block}
      .main{padding:16px 12px 48px}
      .hero{padding:18px 20px}
      h1{font-size:24px}
      .article-grid{grid-template-columns:1fr}
      .article-card.featured{grid-column:span 1}
      .article-card.featured h2{font-size:18px}
    }
    @media(max-width:420px){
      .footer-cols{grid-template-columns:1fr}
    }