*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--font);background:var(--bg);color:var(--ink);line-height:1.6;font-size:var(--fs)}
a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}
nav.site-nav{background:var(--primary);padding:0 40px;height:56px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100}
.nav-brand{color:var(--white);font-size:1rem;font-weight:700;text-decoration:none}
.nav-links{display:flex;gap:20px;align-items:center}
.nav-links a{color:rgba(255,255,255,0.75);font-size:0.8rem;text-decoration:none}
.nav-links a:hover{color:var(--white)}
.nav-lang{background:var(--accent);color:var(--white);padding:4px 10px;border-radius:var(--radius);font-size:0.72rem;font-weight:700}
.mech-nav{background:var(--surface-alt);border-bottom:1px solid var(--border);padding:0 40px;overflow-x:auto;white-space:nowrap}
.mech-nav a{display:inline-block;padding:12px 16px;font-size:0.78rem;font-weight:600;color:var(--muted);text-decoration:none;border-bottom:2px solid transparent}
.mech-nav a:hover,.mech-nav a.active{color:var(--primary);border-bottom-color:var(--accent)}
.hero{background:var(--primary);padding:64px 40px}
.hero-label{font-size:0.65rem;font-weight:700;letter-spacing:0.2em;text-transform:uppercase;color:var(--accent);margin-bottom:12px}
.hero h1{font-size:clamp(1.8rem,3.5vw,2.8rem);color:var(--white);line-height:1.2;margin-bottom:14px;max-width:600px}
.hero-sub{font-size:0.95rem;color:rgba(255,255,255,0.7);max-width:520px;line-height:1.75}
.container{max-width:1000px;margin:0 auto;padding:48px 40px}
.section-title{font-size:1.3rem;font-weight:700;color:var(--ink);margin-bottom:6px}
.section-sub{color:var(--muted);font-size:0.86rem;margin-bottom:28px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:16px}
.card{background:var(--surface);border:1px solid var(--border);border-top:3px solid var(--accent);padding:20px;border-radius:var(--radius);box-shadow:var(--shadow);transition:box-shadow 0.15s}
.card:hover{box-shadow:0 8px 24px rgba(0,0,0,0.12)}
.card-icon{font-size:1.4rem;margin-bottom:8px}
.card-badges{display:flex;gap:6px;margin-bottom:10px;flex-wrap:wrap}
.badge{font-size:0.6rem;font-weight:700;padding:2px 7px;border-radius:2px;text-transform:uppercase;letter-spacing:0.08em}
.badge-easy{background:#DCFCE7;color:#166534}.badge-medium{background:#FEF9C3;color:#854D0E}.badge-hard{background:#FEE2E2;color:#991B1B}
.badge-fast{background:#DBEAFE;color:#1E40AF}.badge-slow{background:#F3F4F6;color:#374151}
.badge-free{background:#F0FDF4;color:#166534}.badge-low{background:#EFF6FF;color:#1D4ED8}
.card h3{font-size:0.88rem;font-weight:700;color:var(--ink);margin-bottom:6px}
.card p{font-size:0.76rem;color:var(--muted);line-height:1.55;margin-bottom:12px}
.card-link{font-size:0.74rem;font-weight:700;color:var(--primary)}
.opp-meta{display:flex;gap:16px;flex-wrap:wrap;margin-top:16px}
.opp-meta-item .opp-meta-label{font-size:0.7rem;color:rgba(255,255,255,0.6);display:block;margin-bottom:4px}
.opp-content{max-width:760px;margin:0 auto;padding:48px 40px}
.section-block{margin-bottom:36px;padding-bottom:36px;border-bottom:1px solid var(--border)}
.section-block:last-child{border-bottom:none}
.section-block h2{font-size:1.05rem;font-weight:700;color:var(--ink);margin-bottom:10px}
.section-block p{font-size:0.88rem;color:var(--muted);line-height:1.75}
.breadcrumb{font-size:0.72rem;color:var(--muted);padding:10px 40px;max-width:760px;margin:0 auto}
.breadcrumb a{color:var(--muted)}
site-footer{display:block;background:var(--ink);color:rgba(255,255,255,0.45);padding:28px 40px;font-size:0.72rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;margin-top:40px}
site-footer a{color:rgba(255,255,255,0.55)}
@media(max-width:640px){
  nav.site-nav,.hero,.container,.opp-content,.breadcrumb,.mech-nav,site-footer{padding-left:16px;padding-right:16px}
}

/* ── LEFT SIDEBAR LAYOUT ─────────────────────────────────── */
.layout-sidebar .site-topbar{background:var(--primary);padding:0 24px;height:48px;display:flex;align-items:center;justify-content:space-between}
.layout-sidebar .topbar-brand{color:var(--white);font-size:0.9rem;font-weight:700;text-decoration:none}
.layout-sidebar .topbar-links{display:flex;gap:16px;align-items:center}
.layout-sidebar .topbar-links a{color:rgba(255,255,255,0.75);font-size:0.78rem;text-decoration:none}
.layout-sidebar .topbar-links a:hover{color:var(--white)}
.layout-sidebar .nav-lang{background:var(--accent);color:var(--white);padding:3px 8px;border-radius:var(--radius);font-size:0.68rem;font-weight:700}
.layout-sidebar .page-wrapper{display:grid;grid-template-columns:220px 1fr;min-height:calc(100vh - 48px)}
.layout-sidebar .sidebar{background:var(--surface);border-right:1px solid var(--border);padding:24px 0;position:sticky;top:48px;height:calc(100vh - 48px);overflow-y:auto}
.layout-sidebar .sidebar-section-label{font-size:0.6rem;font-weight:700;letter-spacing:0.12em;text-transform:uppercase;color:var(--muted);padding:0 20px;margin:20px 0 8px}
.layout-sidebar .sidebar a{display:block;padding:8px 20px;font-size:0.8rem;color:var(--ink);text-decoration:none;border-left:2px solid transparent;transition:all 0.1s}
.layout-sidebar .sidebar a:hover{background:var(--surface-alt);color:var(--primary)}
.layout-sidebar .sidebar a.active{background:var(--surface-alt);color:var(--primary);border-left-color:var(--accent);font-weight:600}
.layout-sidebar .main-content{overflow:hidden;padding:0}
.layout-sidebar .hero{padding:48px 40px}
.layout-sidebar .container{padding:40px}
.layout-sidebar .opp-content{padding:40px;max-width:none}
.layout-sidebar .breadcrumb{padding:10px 40px}
.layout-sidebar .ad-block{margin:0 40px 24px}
.layout-sidebar .insight-widget{margin:0 40px 24px}
.sidebar-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;color:var(--white)}
.sidebar-toggle span{display:block;width:20px;height:2px;background:currentColor;margin:4px 0}
.sidebar-overlay{display:none;position:fixed;inset:0;top:48px;background:rgba(0,0,0,0.4);z-index:199}
.sidebar-overlay.open{display:block}

/* Ad block */
.ad-block{border:1px solid var(--border);border-top:2px solid var(--accent);padding:16px;margin:24px 0;border-radius:var(--radius)}
.ad-label{font-size:0.6rem;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
.ad-link{text-decoration:none}
.ad-brand{font-size:0.85rem;font-weight:700;color:var(--ink);margin-bottom:4px}
.ad-text{font-size:0.76rem;color:var(--muted);margin-bottom:8px;line-height:1.5}
.ad-cta{font-size:0.74rem;font-weight:700;color:var(--primary)}

/* Insight widget */
.insight-widget{background:var(--surface-alt);border:1px solid var(--border);border-left:3px solid var(--primary);padding:20px;margin:24px 0;border-radius:var(--radius)}
.insight-widget-label{font-size:0.6rem;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
.insight-widget-title{font-size:0.95rem;font-weight:700;color:var(--ink);margin-bottom:8px;line-height:1.3}
.insight-widget p{font-size:0.78rem;color:var(--muted);line-height:1.6;margin-bottom:12px}
.insight-widget-link{font-size:0.78rem;font-weight:700;color:var(--primary);text-decoration:none}

/* Back to top */
.back-to-top{position:fixed;bottom:24px;right:16px;background:var(--primary);color:var(--white);border:none;border-radius:50%;width:44px;height:44px;font-size:1.2rem;cursor:pointer;display:none;align-items:center;justify-content:center;z-index:999;box-shadow:0 2px 8px rgba(0,0,0,0.3)}
.back-to-top.visible{display:flex}

/* Mobile mech-nav toggle */
.mech-nav-toggle{display:none;width:100%;background:var(--surface-alt);border:none;border-bottom:1px solid var(--border);padding:10px 16px;font-size:0.78rem;font-weight:600;color:var(--primary);cursor:pointer;justify-content:space-between;align-items:center}
.mech-nav-toggle::after{content:'▾';font-size:1rem;color:var(--accent)}
.mech-nav-toggle.open::after{content:'▴'}

@media(max-width:768px){
  .layout-sidebar .page-wrapper{grid-template-columns:1fr}
  .layout-sidebar .sidebar{position:fixed;top:48px;left:-240px;width:220px;height:calc(100vh - 48px);z-index:200;transition:left 0.25s;box-shadow:2px 0 16px rgba(0,0,0,0.1)}
  .layout-sidebar .sidebar.open{left:0}
  .sidebar-toggle{display:block}
  .mech-nav-toggle{display:flex}
  .mech-nav{display:none!important;flex-direction:column;padding:0;white-space:normal;overflow:visible;max-width:200px;border-right:1px solid var(--border);box-shadow:2px 4px 12px rgba(0,0,0,0.08)}
  .mech-nav.open{display:flex!important}
  .mech-nav a{padding:12px 16px;border-bottom:1px solid var(--border)!important;border-left:none;white-space:normal;color:var(--ink)}
  .mech-nav a:last-child{border-bottom:none;padding-bottom:20px}
  .mech-nav a.active{background:var(--primary);color:var(--white)}
  nav.site-nav,.hero,.container,.opp-content,.breadcrumb,site-footer{padding-left:16px;padding-right:16px}
  .mech-nav{padding-left:0;padding-right:0}
  .layout-sidebar .ad-block,.layout-sidebar .insight-widget{margin:0 16px 24px}
}