:root {
  --blue: #1E4FA8; --blue-dark: #163B7F; --blue-deep: #0F2A5C;
  --orange: #F08828; --ink: #1A1F2E; --slate: #4A5568; --slate-2: #6B7280;
  --line: #E5E9F0; --bg-alt: #F4F7FB;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--ink); background: #fff; line-height: 1.7; font-size: 16px;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--blue); }
h1, h2, h3 { font-family: 'Plus Jakarta Sans', sans-serif; color: var(--blue-deep); letter-spacing: -0.02em; line-height: 1.2; }

.l-header { position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,0.95); border-bottom: 1px solid var(--line); }
.l-header-inner { max-width: 1200px; margin: 0 auto; padding: 14px 24px; display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.l-header img { height: 52px; width: auto; display: block; }
.l-back { font-weight: 600; font-size: 15px; text-decoration: none; color: var(--blue); }
.l-back:hover { color: var(--blue-dark); }

.l-hero { background: var(--bg-alt); border-bottom: 1px solid var(--line); padding: 56px 0 44px; }
.l-hero .wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.l-eyebrow { display: inline-block; font-size: 13px; font-weight: 700; color: var(--orange); letter-spacing: 0.14em; text-transform: uppercase; margin-bottom: 12px; }
.l-hero h1 { font-size: clamp(30px, 4vw, 44px); margin-bottom: 12px; }
.l-hero p { color: var(--slate); font-size: 15px; }

.l-body { max-width: 1200px; margin: 0 auto; padding: 56px 24px 88px; display: grid; grid-template-columns: 260px 1fr; gap: 64px; align-items: start; }
.l-toc { position: sticky; top: 100px; font-size: 14px; }
.l-toc strong { display: block; font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--slate-2); margin-bottom: 12px; }
.l-toc ol { list-style: none; display: grid; gap: 8px; counter-reset: t; }
.l-toc li { counter-increment: t; }
.l-toc a { color: var(--slate); text-decoration: none; display: flex; gap: 8px; }
.l-toc a::before { content: counter(t, decimal-leading-zero); color: var(--orange); font-weight: 700; font-size: 12px; padding-top: 2px; }
.l-toc a:hover { color: var(--blue); }

.l-content { max-width: 760px; }
.l-content section { padding-bottom: 36px; margin-bottom: 36px; border-bottom: 1px solid var(--line); scroll-margin-top: 100px; }
.l-content section:last-child { border-bottom: none; }
.l-content h2 { font-size: 22px; margin-bottom: 14px; }
.l-content h3 { font-size: 16px; margin: 20px 0 8px; }
.l-content p { color: var(--slate); margin-bottom: 12px; text-wrap: pretty; }
.l-content ul { margin: 0 0 12px 0; padding-left: 20px; color: var(--slate); display: grid; gap: 6px; }
.l-content li::marker { color: var(--orange); }
.l-content strong { color: var(--ink); }
.l-note { background: var(--bg-alt); border: 1px solid var(--line); border-radius: 14px; padding: 18px 20px; font-size: 14px; color: var(--slate); margin: 16px 0; }
.l-table { width: 100%; border-collapse: collapse; font-size: 14px; margin: 12px 0 16px; }
.l-table th, .l-table td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: top; color: var(--slate); }
.l-table th { background: var(--bg-alt); color: var(--blue-deep); font-weight: 700; }

.l-footer { background: var(--blue-deep); color: rgba(255,255,255,0.6); font-size: 13px; padding: 28px 0; }
.l-footer .wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.l-footer a { color: rgba(255,255,255,0.8); text-decoration: none; margin-left: 20px; }
.l-footer a:hover { color: var(--orange); }

@media (max-width: 900px) {
  .l-body { grid-template-columns: 1fr; gap: 32px; padding-top: 36px; }
  .l-toc { position: static; background: var(--bg-alt); border-radius: 14px; padding: 20px; }
  .l-header img { height: 44px; }
  .l-footer a { margin: 0 16px 0 0; }
}