.inner-main { padding: 0 0 66px; background: #f4f6f7; }

.breadcrumb {
  display: flex;
  min-height: 72px;
  align-items: center;
  gap: 12px;
  color: #84939c;
  font-size: .79rem;
}
.breadcrumb a:hover { color: var(--orange); }
.breadcrumb strong { color: #536875; font-weight: 700; }

.inner-layout {
  display: grid;
  align-items: start;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 30px;
}

.side-navigation { position: sticky; top: 20px; }
.side-group { padding: 16px 0; border-bottom: 1px solid #cfd8dd; }
.side-group:first-child { padding-top: 8px; }
.side-group h2 { margin: 0 0 9px; font-size: .94rem; letter-spacing: 0; }
.side-group h2 a { color: #82929c; }
.side-group.current-group h2 a { color: var(--orange); }
.side-group ul { margin: 0; padding: 0; list-style: none; }
.side-group li { margin: 0; }
.side-group li a { display: block; padding: 5px 8px 5px 18px; color: #7d8e98; font-size: .8rem; line-height: 1.35; }
.side-group li a:hover { color: var(--orange); }
.side-group li a.active { position: relative; color: var(--navy-dark); font-weight: 800; }
.side-group li a.active::before { position: absolute; top: 10px; left: 2px; width: 7px; height: 7px; border-radius: 50%; content: ""; background: var(--orange); }

.page-article { min-width: 0; overflow: hidden; border: 1px solid #dce4e8; background: #fff; box-shadow: 0 8px 24px rgba(4,37,61,.06); }
.page-hero { position: relative; overflow: hidden; min-height: 390px; }
.page-hero > img { width: 100%; height: 390px; object-fit: cover; }
.page-hero-shade { position: absolute; inset: 0; background: linear-gradient(to top, rgba(4,31,50,.86), rgba(4,31,50,.04) 68%); }
.page-hero-copy { position: absolute; right: 42px; bottom: 36px; left: 42px; color: #fff; }
.page-hero-copy p { margin-bottom: 7px; color: #72e2dc; font-size: .69rem; font-weight: 900; letter-spacing: .13em; text-transform: uppercase; }
.page-hero-copy h1 { max-width: 760px; margin-bottom: 8px; color: #fff; font-size: clamp(2.5rem, 5vw, 4.4rem); }
.page-hero-copy > span { display: block; max-width: 690px; color: #dbe7ec; font-size: 1rem; }

.article-content { padding: 42px 48px 48px; }
.article-lead { max-width: 900px; margin-bottom: 28px; color: var(--navy-dark); font-size: clamp(1.18rem, 2.2vw, 1.48rem); line-height: 1.48; }
.page-points { display: grid; margin: 0 0 40px; padding: 20px 22px; border-top: 1px solid #dfe7ea; border-bottom: 1px solid #dfe7ea; list-style: none; grid-template-columns: repeat(4, 1fr); gap: 15px; }
.page-points li { color: #576c79; font-size: .77rem; font-weight: 700; }
.page-points span { display: inline-grid; width: 20px; height: 20px; margin-right: 6px; place-items: center; border-radius: 50%; color: var(--teal); background: #e0f6f4; font-size: .7rem; }

.copy-sections { display: grid; gap: 0; }
.copy-section { display: grid; padding: 25px 0; border-bottom: 1px solid #e2e8eb; grid-template-columns: 58px 1fr; gap: 16px; }
.copy-section:first-child { border-top: 1px solid #e2e8eb; }
.copy-section > span { display: grid; width: 38px; height: 38px; place-items: center; border: 1px solid #b9d8dc; border-radius: 50%; color: var(--teal); font-size: .68rem; font-weight: 900; }
.copy-section h2 { margin: 3px 0 8px; font-size: 1.2rem; letter-spacing: -.01em; }
.copy-section p { max-width: 870px; margin: 0; color: var(--muted); font-size: .9rem; }

.content-eyebrow { margin-bottom: 7px; color: var(--teal); font-size: .66rem; font-weight: 700; letter-spacing: .13em; text-transform: uppercase; }
.deep-guide { margin-top: 46px; padding-top: 39px; border-top: 3px solid var(--navy); }
.deep-guide > h2, .faq-section > h2 { margin: 0 0 12px; font-size: clamp(1.55rem, 2.7vw, 2.15rem); letter-spacing: -.025em; }
.deep-guide-intro { max-width: 850px; margin-bottom: 25px; color: var(--muted); font-size: .94rem; }
.detail-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.detail-card { min-height: 180px; padding: 23px 22px; border: 1px solid #dbe5e9; border-top: 3px solid var(--teal); background: #f7f9fa; }
.detail-card h3 { margin: 0 0 10px; font-size: 1.05rem; }
.detail-card p { margin: 0; color: var(--muted); font-size: .84rem; }

.practical-grid { display: grid; margin-top: 30px; grid-template-columns: 1.15fr .85fr; }
.checklist-panel, .notice-panel { padding: 30px; }
.checklist-panel { color: #dfecef; background: var(--navy); }
.checklist-panel h2, .notice-panel h2 { margin: 0 0 18px; font-size: 1.35rem; }
.checklist-panel h2 { color: #fff; }
.checklist-panel ul { display: grid; margin: 0; padding: 0; list-style: none; gap: 11px; }
.checklist-panel li { display: flex; align-items: flex-start; gap: 9px; color: #dce9ee; font-size: .84rem; }
.checklist-panel li span { display: grid; width: 19px; height: 19px; flex: 0 0 auto; place-items: center; border-radius: 50%; color: var(--navy); background: #73ded8; font-size: .66rem; font-weight: 700; }
.notice-panel { border: 1px solid #ffd1ac; background: #fff5ed; }
.notice-panel p:not(.content-eyebrow) { margin-bottom: 17px; color: #687b86; font-size: .84rem; }
.notice-panel a { color: var(--orange); font-size: .8rem; font-weight: 700; }

.faq-section { margin-top: 43px; padding-top: 39px; border-top: 1px solid #dfe7ea; }
.faq-list { margin-top: 22px; border-top: 1px solid #dce5e9; }
.faq-list details { border-bottom: 1px solid #dce5e9; }
.faq-list summary { display: flex; min-height: 62px; align-items: center; justify-content: space-between; gap: 18px; padding: 16px 2px; color: var(--navy-dark); cursor: pointer; font-size: .92rem; font-weight: 700; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { display: grid; width: 28px; height: 28px; flex: 0 0 auto; place-items: center; border: 1px solid #bfd4db; border-radius: 50%; color: var(--teal); font-size: 1.1rem; transition: transform .2s ease; }
.faq-list details[open] summary span { transform: rotate(45deg); }
.faq-list details > p { max-width: 830px; margin: -2px 42px 19px 2px; color: var(--muted); font-size: .86rem; }

.page-cta { display: flex; align-items: center; justify-content: space-between; gap: 28px; margin-top: 40px; padding: 28px 30px; color: #dce9ee; background: var(--navy); }
.page-cta p { margin-bottom: 2px; color: #70dfda; font-size: .69rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; }
.page-cta h2 { margin: 0; color: #fff; font-size: 1.45rem; }
.page-cta .button { flex: 0 0 auto; }
.page-footer .footer-contact { border-top: 0; }

@media (max-width: 980px) {
  .inner-layout { grid-template-columns: 190px minmax(0, 1fr); gap: 20px; }
  .page-hero, .page-hero > img { min-height: 340px; height: 340px; }
  .article-content { padding: 34px; }
  .page-points { grid-template-columns: repeat(2, 1fr); }
  .detail-grid { grid-template-columns: 1fr; }
  .detail-card { min-height: 0; }
}

@media (max-width: 760px) {
  .breadcrumb { min-height: 58px; overflow-x: auto; white-space: nowrap; }
  .inner-layout { width: 100%; grid-template-columns: 1fr; gap: 0; }
  .side-navigation { position: static; display: flex; padding: 0 14px 14px; overflow-x: auto; gap: 8px; }
  .side-group { flex: 0 0 auto; padding: 0; border: 0; }
  .side-group:not(.current-group) { display: none; }
  .side-group h2 { display: none; }
  .side-group ul { display: flex; gap: 6px; }
  .side-group li a { min-height: 38px; padding: 9px 12px; border: 1px solid #d8e0e4; border-radius: 3px; background: #fff; white-space: nowrap; }
  .side-group li a.active { color: #fff; border-color: var(--navy); background: var(--navy); }
  .side-group li a.active::before { display: none; }
  .page-article { border-right: 0; border-left: 0; }
  .page-hero, .page-hero > img { min-height: 400px; height: 400px; }
  .page-hero > img { object-position: center; }
  .page-hero-copy { right: 24px; bottom: 27px; left: 24px; }
  .page-hero-copy h1 { font-size: 2.65rem; }
  .article-content { padding: 29px 22px 35px; }
  .page-points { grid-template-columns: 1fr 1fr; padding-inline: 0; }
  .practical-grid { grid-template-columns: 1fr; }
  .page-cta { align-items: stretch; flex-direction: column; }
}

@media (max-width: 480px) {
  .page-hero, .page-hero > img { min-height: 350px; height: 350px; }
  .page-hero-copy h1 { font-size: 2.25rem; }
  .page-points { grid-template-columns: 1fr; }
  .copy-section { grid-template-columns: 45px 1fr; gap: 10px; }
  .copy-section > span { width: 34px; height: 34px; }
  .deep-guide { margin-top: 36px; }
  .checklist-panel, .notice-panel { padding: 25px 22px; }
  .page-cta { padding: 24px 21px; }
  .page-cta .button { width: 100%; }
}