.col-wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.col-narrow { max-width: 760px; }
.col-chip { display: inline-block; font-size: .78rem; letter-spacing: .06em; padding: 4px 12px; border-radius: 999px; background: rgba(26,95,255,.1); color: var(--blue); }
.col-chip--light { background: rgba(255,255,255,.18); color: #fff; }
.col-date { font-size: .82rem; color: var(--muted); opacity: .75; }

.col-header .logo-tag { font-size: .78rem; }

.col-hero { background: var(--grad-hero); color: #fff; padding: 56px 0 48px; }
.col-hero .col-breadcrumb { color: rgba(255,255,255,.75); margin-bottom: 18px; }
.col-hero .col-breadcrumb a { color: rgba(255,255,255,.85); text-decoration: underline; }
.col-hero h1 { font-size: 2rem; line-height: 1.5; letter-spacing: .02em; margin: 14px 0 18px; }
.col-hero-meta { display: flex; flex-wrap: wrap; gap: 8px 20px; font-size: .85rem; color: rgba(255,255,255,.8); }
.col-breadcrumb { font-size: .82rem; }
.col-breadcrumb ol { display: flex; flex-wrap: wrap; gap: 6px; }
.col-breadcrumb li + li::before { content: "\203A"; margin-right: 6px; opacity: .6; }

.col-main { padding: 48px 0 80px; }
.col-lead { position: relative; background: var(--bg-tint); border-left: 4px solid var(--blue); border-radius: 0 var(--radius) var(--radius) 0; padding: 22px 26px 22px 28px; margin: 0 0 32px; font-size: 1.05rem; line-height: 1.95; }
.col-lead-label { display: block; font-size: .78rem; letter-spacing: .1em; color: var(--blue); margin-bottom: 8px; }

.col-toc { border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 26px; margin: 0 0 40px; background: #fff; }
.col-toc-title { font-size: .95rem; letter-spacing: .08em; margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.col-toc-title::before { content: ""; width: 10px; height: 10px; border-radius: 2px; background: var(--grad-blue); }
.col-toc ol { counter-reset: toc; }
.col-toc li { counter-increment: toc; padding: 6px 0 6px 30px; position: relative; font-size: .95rem; }
.col-toc li::before { content: counter(toc, decimal-leading-zero); position: absolute; left: 0; top: 6px; font-family: "Montserrat", sans-serif; font-weight: 800; color: var(--blue); font-size: .85rem; }
.col-toc a { text-decoration: none; border-bottom: 1px solid transparent; }
.col-toc a:hover { border-bottom-color: var(--blue); }

.col-body h2 { font-size: 1.45rem; line-height: 1.5; margin: 48px 0 18px; padding: 10px 0 10px 18px; border-left: 5px solid var(--blue); background: linear-gradient(90deg, rgba(26,95,255,.06), transparent 70%); scroll-margin-top: 110px; }
.col-body h2:first-child { margin-top: 0; }
.col-body h3 { font-size: 1.15rem; margin: 30px 0 12px; padding-bottom: 8px; border-bottom: 2px solid var(--line); }
.col-body p { margin: 0 0 18px; font-weight: 500; }
.col-body ul, .col-body ol { margin: 0 0 18px; padding-left: 1.5em; list-style: revert; font-weight: 500; }
.col-body li { margin-bottom: 8px; }
.col-body li::marker { color: var(--blue); }
.col-body a { color: var(--blue); text-decoration: underline; }
.col-body strong { font-weight: 700; color: var(--navy); }
.col-table-wrap { overflow-x: auto; margin: 0 0 24px; }
.col-body table { width: 100%; min-width: 480px; border-collapse: separate; border-spacing: 0; font-size: .92rem; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.col-body th, .col-body td { padding: 12px 14px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--line); }
.col-body th { background: var(--navy); color: #fff; font-weight: 700; }
.col-body tr:last-child td { border-bottom: none; }
.col-body tbody tr:nth-child(even) td { background: var(--bg-tint); }
.col-body td:first-child { font-weight: 700; color: var(--navy); }

.col-section-title { font-size: 1.3rem; margin: 56px 0 8px; display: flex; align-items: center; gap: 12px; }
.col-section-title::before { content: ""; width: 28px; height: 4px; border-radius: 4px; background: var(--grad-blue); }
.col-faq.faq { margin-top: 18px; }
.col-faq summary { font-weight: 700; }
.col-faq summary::before { content: "Q."; color: var(--blue); font-family: "Montserrat", sans-serif; margin-right: 8px; }
.col-faq p { font-weight: 500; }

.col-cta { background: var(--grad-hero); color: #fff; border-radius: var(--radius); padding: 40px 36px; margin: 56px 0 0; box-shadow: var(--shadow-lg); }
.col-cta-title { font-size: 1.45rem; line-height: 1.5; letter-spacing: .02em; }
.col-cta-text { margin-top: 12px; color: rgba(255,255,255,.88); font-weight: 500; }
.col-cta-facts { margin: 18px 0 26px; display: grid; gap: 8px; }
.col-cta-facts li { display: flex; gap: 10px; align-items: flex-start; font-size: .95rem; }
.col-cta-facts li::before { content: "\2713"; color: var(--teal-2); font-weight: 800; flex: none; }
.col-cta-btns { display: flex; flex-wrap: wrap; gap: 14px; }
.col-cta .btn-white { background: #fff; color: var(--navy); }
.col-cta .btn { padding: 15px 30px; font-size: .98rem; }

.col-author { display: flex; gap: 18px; align-items: flex-start; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 24px; margin-top: 40px; background: #fff; }
.col-author-mark { flex: none; width: 56px; height: 56px; border-radius: 50%; background: var(--grad-blue); display: grid; place-items: center; color: #fff; font-family: "Montserrat", sans-serif; font-weight: 800; font-size: 1.1rem; }
.col-author-label { font-size: .78rem; letter-spacing: .08em; color: var(--blue); }
.col-author-name { font-size: 1.05rem; margin: 2px 0 6px; }
.col-author-text { font-size: .92rem; font-weight: 500; }

.col-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; margin-top: 22px; }
.col-card { display: flex; flex-direction: column; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); transition: transform .15s ease, box-shadow .15s ease; }
.col-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.col-eyecatch { aspect-ratio: 16 / 9; background: var(--grad-hero); color: #fff; padding: 18px 20px; display: flex; flex-direction: column; justify-content: flex-end; gap: 10px; position: relative; overflow: hidden; }
.col-eyecatch::after { content: "Q"; position: absolute; right: 14px; top: -12px; font-family: var(--font-serif); font-size: 6rem; line-height: 1; color: rgba(255,255,255,.08); }
.col-eyecatch-title { font-family: var(--font-serif); font-size: 1.05rem; line-height: 1.5; position: relative; }
.col-card-body { padding: 16px 20px 20px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.col-card-body p { font-size: .88rem; color: var(--muted); font-weight: 500; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.col-card-body .col-date { margin-top: auto; }

.col-index-hero { background: var(--grad-hero); color: #fff; padding: 64px 0 56px; text-align: center; }
.col-index-hero h1 { font-size: 2.2rem; letter-spacing: .04em; }
.col-index-hero p { margin-top: 14px; color: rgba(255,255,255,.85); font-weight: 500; }
.col-index-main { padding: 56px 0 80px; }
.col-index-count { font-size: .9rem; color: var(--muted); margin-bottom: 4px; }
.col-index-groups { display: grid; gap: 48px; }
.col-group-title { font-size: 1.25rem; display: flex; align-items: center; gap: 12px; }
.col-group-title::before { content: ""; width: 28px; height: 4px; border-radius: 4px; background: var(--grad-blue); }

@media (max-width: 880px) {
  .col-cards { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .col-header .header-inner { height: 72px; }
  .col-header .logo-img { height: 36px; }
  .col-header .logo-tag { display: none; }
  .col-header .btn-header { padding: 10px 16px; font-size: .8rem; white-space: nowrap; }
  .col-wrap { padding: 0 18px; }
  .col-hero { padding: 36px 0 32px; }
  .col-hero h1 { font-size: 1.5rem; }
  .col-main { padding: 32px 0 64px; }
  .col-body h2 { font-size: 1.25rem; margin-top: 40px; }
  .col-lead { font-size: 1rem; padding: 18px 18px 18px 20px; }
  .col-cards { grid-template-columns: 1fr; }
  .col-cta { padding: 28px 22px; }
  .col-cta-title { font-size: 1.2rem; }
  .col-cta .btn { width: 100%; }
  .col-index-hero h1 { font-size: 1.7rem; }
  .col-author { flex-direction: column; }
}