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

:root {
  --brand: #f97316;
  --brand-dark: #ea580c;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-400: #9ca3af;
  --gray-600: #4b5563;
  --gray-800: #1f2937;
  --gray-900: #111827;
}

body { font-family: 'Inter', sans-serif; color: var(--gray-800); background: #fff; line-height: 1.7; }

/* Nav */
.nav { border-bottom: 1px solid var(--gray-100); padding: 14px 0; position: sticky; top: 0; background: #fff; z-index: 10; }
.nav-inner { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: flex; align-items: center; justify-content: space-between; }
.nav-logo { font-weight: 700; font-size: 17px; text-decoration: none; color: var(--gray-900); }
.nav-links { display: flex; align-items: center; gap: 20px; }
.nav-links a { text-decoration: none; color: var(--gray-600); font-size: 14px; font-weight: 500; }
.btn-nav { background: var(--brand); color: #fff !important; padding: 7px 16px; border-radius: 7px; font-weight: 600 !important; }

/* Layout */
.layout { display: grid; grid-template-columns: 240px 1fr; max-width: 1200px; margin: 0 auto; min-height: calc(100vh - 120px); }

/* Sidebar */
.sidebar { border-right: 1px solid var(--gray-100); padding: 32px 20px; position: sticky; top: 57px; height: calc(100vh - 57px); overflow-y: auto; }
.sidebar-section { margin-bottom: 24px; }
.sidebar-label { font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .6px; color: var(--gray-400); margin-bottom: 8px; }
.sidebar-link { display: block; font-size: 13px; color: var(--gray-600); text-decoration: none; padding: 5px 10px; border-radius: 6px; margin-bottom: 2px; }
.sidebar-link:hover, .sidebar-link.active { background: var(--gray-50); color: var(--gray-900); }
.sidebar-link.active { font-weight: 500; color: var(--brand); }

/* Content */
.content { padding: 48px 56px; max-width: 780px; }
.content h1 { font-size: 32px; font-weight: 700; margin-bottom: 12px; }
.lead { font-size: 16px; color: var(--gray-600); margin-bottom: 40px; }
.content section { margin-bottom: 40px; }
.content h2 { font-size: 20px; font-weight: 600; margin-bottom: 12px; padding-top: 8px; border-top: 1px solid var(--gray-100); }
.content p { font-size: 14px; color: var(--gray-600); margin-bottom: 12px; }
.content ol, .content ul { font-size: 14px; color: var(--gray-600); padding-left: 20px; margin-bottom: 12px; }
.content li { margin-bottom: 6px; }
.content a { color: var(--brand); }
.content code { background: var(--gray-100); padding: 2px 6px; border-radius: 4px; font-size: 12px; font-family: monospace; }
.content pre { background: var(--gray-900); color: #e5e7eb; padding: 20px; border-radius: 10px; font-size: 13px; overflow-x: auto; margin: 16px 0; }
.content pre code { background: none; padding: 0; color: inherit; font-size: 13px; }

/* Footer */
.footer { border-top: 1px solid var(--gray-100); padding: 20px 24px; }
.container { max-width: 1200px; margin: 0 auto; }
.footer-inner { display: flex; align-items: center; justify-content: space-between; font-size: 13px; color: var(--gray-400); }
.footer-links { display: flex; gap: 16px; }
.footer-links a { color: var(--gray-400); text-decoration: none; }