:root { --ink:#11120f; --paper:#f5f4ef; --line:#d9dad3; --muted:#696b63; --acid:#d8ff43; --dark:#171914; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: Arial, "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif; }
a { color: inherit; }
.guide-topbar { position: sticky; z-index: 20; top: 0; min-height: 80px; padding: 0 5vw; border-bottom: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 24px; background: rgba(245,244,239,.94); backdrop-filter: blur(12px); }
.guide-brand { display: flex; align-items: center; gap: 11px; color: var(--ink); font-size: 19px; font-weight: 900; letter-spacing: -.05em; text-decoration: none; }
.guide-mark { display: flex; align-items: end; gap: 3px; height: 25px; }
.guide-mark i { width: 7px; background: currentColor; transform: skew(-8deg); }
.guide-mark i:nth-child(1) { height: 14px; }
.guide-mark i:nth-child(2) { height: 24px; }
.guide-mark i:nth-child(3) { height: 20px; }
.guide-topbar nav { display: flex; gap: 24px; font-size: 9px; font-weight: 800; }
.guide-topbar nav a { text-decoration: none; }
.guide-cta { padding: 13px 16px; background: var(--ink); color: white; display: flex; gap: 26px; align-items: center; font-size: 9px; font-weight: 800; text-decoration: none; }
.guide-hero { padding: 85px max(5vw,calc((100vw - 1120px)/2)) 70px; }
.breadcrumb { margin-bottom: 55px; display: flex; gap: 8px; color: #83857d; font-size: 9px; }
.breadcrumb a { text-underline-offset: 3px; }
.guide-kicker, .section-label { display: block; color: #6f7169; font-size: 9px; font-weight: 800; letter-spacing: .18em; }
.guide-hero h1 { max-width: 970px; margin: 20px 0 28px; font-size: clamp(48px,7.7vw,104px); letter-spacing: -.085em; line-height: .94; }
.guide-hero h1 em { font-style: normal; background: linear-gradient(transparent 76%,var(--acid) 0); box-decoration-break: clone; -webkit-box-decoration-break: clone; }
.mobile-break { display: none; }
.guide-hero > p { max-width: 760px; margin: 0; color: #55574f; font-size: 14px; line-height: 2; }
.guide-meta { margin-top: 30px; display: flex; gap: 20px; color: #85877f; font-size: 9px; }
.guide-visual { max-width: 1240px; margin: 0 auto; padding: 0 5vw; }
.guide-visual img { width: 100%; max-height: 660px; display: block; object-fit: cover; object-position: center; background: #e8e8e2; }
.guide-visual figcaption { margin-top: 10px; color: #7b7d75; font-size: 9px; }
.guide-layout { max-width: 1120px; margin: 100px auto 0; padding: 0 5vw 130px; display: grid; grid-template-columns: 210px minmax(0,760px); gap: 90px; align-items: start; }
.guide-content { min-width: 0; }
.guide-toc { position: sticky; top: 110px; padding: 20px 0; border-top: 2px solid var(--ink); border-bottom: 1px solid var(--line); }
.guide-toc b { font-size: 10px; letter-spacing: .1em; }
.guide-toc ol { margin: 17px 0 0; padding: 0; list-style: none; counter-reset: toc; }
.guide-toc li { counter-increment: toc; margin-top: 11px; display: grid; grid-template-columns: 23px 1fr; color: #66685f; font-size: 9px; line-height: 1.5; }
.guide-toc li::before { content: "0" counter(toc); color: #9b9d95; }
.guide-toc a { text-decoration: none; }
.guide-content > section { padding: 0 0 90px; scroll-margin-top: 110px; }
.guide-content > section + section { padding-top: 80px; border-top: 1px solid var(--line); }
.guide-content h2 { margin: 14px 0 28px; font-size: clamp(30px,4vw,48px); letter-spacing: -.06em; line-height: 1.12; }
.guide-content h3 { margin: 0; font-size: 16px; }
.guide-content p, .guide-content li, .guide-content td, .guide-content th { font-size: 13px; line-height: 2; }
.guide-content p { margin: 0 0 22px; color: #4f514a; }
.guide-content strong { color: var(--ink); }
.definition-box, .tip-box { margin: 36px 0 0; padding: 28px; border-left: 5px solid var(--acid); background: white; }
.definition-box b, .tip-box b { font-size: 13px; }
.definition-box ul { margin: 13px 0 0; padding-left: 20px; }
.definition-box li { margin-top: 5px; color: #55574f; }
.tip-box p { margin: 8px 0 0; }
.principle-grid { margin: 35px 0; display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.principle-grid article { min-height: 175px; padding: 22px; border: 1px solid var(--line); background: white; }
.principle-grid article:last-child { grid-column: 1 / -1; }
.principle-grid article > b { color: #8ca414; font-size: 10px; letter-spacing: .15em; }
.principle-grid h3 { margin-top: 30px; }
.principle-grid p { margin: 8px 0 0; font-size: 11px; line-height: 1.8; }
.method-list { margin: 35px 0; padding: 0; list-style: none; counter-reset: method; }
.method-list li { position: relative; min-height: 130px; padding: 0 0 28px 80px; counter-increment: method; }
.method-list li::before { content: counter(method); position: absolute; left: 0; top: 0; width: 52px; height: 52px; border-radius: 50%; display: grid; place-items: center; background: var(--acid); color: var(--ink); font-size: 18px; font-weight: 800; }
.method-list li:not(:last-child)::after { content: ""; position: absolute; left: 25px; top: 57px; bottom: 5px; width: 1px; background: #cfd0ca; }
.method-list li > b { font-size: 16px; }
.method-list p { margin: 6px 0 0; }
table { width: 100%; margin: 34px 0; border-collapse: collapse; background: white; }
th, td { padding: 16px 18px; border: 1px solid var(--line); vertical-align: top; text-align: left; }
thead th { background: var(--ink); color: white; font-size: 10px !important; }
tbody th { width: 20%; background: #eeeeea; font-size: 11px !important; }
.comparison-table-wrap { overflow-x: auto; }
.choice-table { min-width: 680px; }
.choice-table tbody th { width: 16%; }
.ai-grid { margin: 34px 0; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.ai-grid > div { padding: 25px; background: white; border-top: 5px solid var(--acid); }
.ai-grid > div.warning { border-top-color: var(--ink); }
.ai-grid b { font-size: 13px; }
.ai-grid ul { margin: 13px 0 0; padding-left: 19px; }
.service-box { margin-bottom: 90px; padding: 45px !important; border: 0 !important; background: var(--ink); color: white; }
.service-box > span { color: var(--acid); font-size: 9px; font-weight: 800; letter-spacing: .18em; }
.service-box h2 { color: white; }
.service-box p { color: #bec0b8; }
.service-box ul { margin: 22px 0; padding-left: 20px; color: white; }
.service-box a { margin-top: 12px; padding: 16px 18px; background: var(--acid); color: var(--ink); display: flex; align-items: center; justify-content: space-between; font-size: 11px; font-weight: 800; text-decoration: none; }
.faq-section details { border-top: 1px solid var(--line); }
.faq-section details:last-child { border-bottom: 1px solid var(--line); }
.faq-section summary { padding: 22px 40px 22px 0; cursor: pointer; font-size: 14px; font-weight: 800; list-style: none; }
.faq-section summary::after { content: "+"; float: right; margin-right: -35px; font-size: 20px; font-weight: 400; }
.faq-section details[open] summary::after { content: "−"; }
.faq-section details p { padding: 0 20px 22px; }
.guide-footer { padding: 45px 5vw; background: var(--ink); color: white; display: grid; grid-template-columns: 1fr 1fr 2fr; gap: 30px; align-items: end; }
.guide-brand.inverted { color: white; }
.guide-footer p { margin: 0; color: #8f9189; font-size: 9px; line-height: 1.6; }
.guide-footer > div { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 17px; }
.guide-footer a, .guide-footer span { color: #afb1a9; font-size: 9px; }
@media (max-width:900px) {
  .guide-topbar nav { display: none; }
  .guide-layout { grid-template-columns: 1fr; gap: 45px; margin-top: 70px; }
  .guide-toc { position: static; }
  .guide-toc ol { columns: 2; }
  .guide-footer { grid-template-columns: 1fr; }
  .guide-footer > div { justify-content: flex-start; }
}
@media (max-width:600px) {
  .guide-topbar { min-height: 68px; padding: 0 18px; }
  .guide-brand { font-size: 16px; }
  .guide-cta { padding: 11px 12px; gap: 12px; }
  .guide-hero { padding: 55px 20px 45px; }
  .breadcrumb { margin-bottom: 40px; }
  .guide-hero h1 { font-size: 48px; }
  .mobile-break { display: block; }
  .guide-hero > p { font-size: 12px; }
  .guide-visual { padding: 0 20px; }
  .guide-visual img { min-height: 320px; }
  .guide-layout { padding: 0 20px 80px; }
  .guide-toc ol { columns: 1; }
  .guide-content > section { padding-bottom: 65px; }
  .guide-content > section + section { padding-top: 60px; }
  .principle-grid, .ai-grid { grid-template-columns: 1fr; }
  .principle-grid article:last-child { grid-column: auto; }
  .method-list li { padding-left: 68px; }
  .service-box { padding: 28px 22px !important; }
  .guide-footer { padding: 40px 20px; }
}