:root { --cream: #f6f2ea; --navy: #0f1b33; --blue: #4A90E2; --tint: #e6eff9; --ink: #1b2437; --muted: #5b6577; --line: #d9d4c8; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; line-height: 1.7; color: var(--ink); background: var(--cream); }
a { color: #1f5fae; }
a:focus-visible { outline: 3px solid var(--navy); outline-offset: 2px; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 24px; }
.top { display: flex; justify-content: space-between; align-items: center; padding: 18px 0; }
.top .brand { font-family: Georgia, serif; font-size: 22px; font-weight: 700; color: var(--ink); text-decoration: none; }
.top .links { display: flex; gap: 20px; align-items: center; font-size: 14px; }
.top .links a { color: var(--ink); text-decoration: none; }
.top .links a.button { background: var(--blue); color: var(--navy); padding: 8px 16px; border-radius: 8px; font-weight: 700; }
.layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 56px; padding-top: 24px; padding-bottom: 72px; align-items: start; }
.toc { position: sticky; top: 24px; font-size: 14px; }
.toc .label { font-family: ui-monospace, Menlo, monospace; font-size: 12px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.toc ol { list-style: none; margin: 0; padding: 0; border-left: 2px solid var(--line); }
.toc li a { display: block; padding: 4px 0 4px 14px; color: var(--muted); text-decoration: none; margin-left: -2px; border-left: 2px solid transparent; }
.toc li a:hover { color: var(--ink); border-left-color: var(--blue); }
article { max-width: 680px; }
article h1 { font-family: Georgia, 'Times New Roman', serif; font-weight: 600; font-size: clamp(32px, 5vw, 46px); line-height: 1.15; margin: 0 0 8px; color: var(--ink); border: 0; padding: 0; }
article h2 { font-family: Georgia, 'Times New Roman', serif; font-weight: 600; font-size: 24px; line-height: 1.25; margin: 44px 0 10px; padding-top: 28px; border-top: 1px solid var(--line); color: var(--ink); scroll-margin-top: 16px; }
article .last-updated { color: var(--muted); font-style: normal; font-family: ui-monospace, Menlo, monospace; font-size: 13px; }
article ul, article ol { padding-left: 22px; }
article li { margin: 8px 0; }
article li::marker { color: var(--blue); }
.tip, .contact { background: var(--tint); border-left: 4px solid var(--blue); padding: 14px 18px; border-radius: 6px; }
.contact { margin-top: 40px; }
.contact h2 { border-top: 0; padding-top: 0; margin-top: 0; }
footer.site { background: var(--navy); color: #9fb2d1; padding: 24px 0; font-size: 14px; }
footer.site .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
footer.site a { color: #9fb2d1; text-decoration: none; margin-right: 16px; }
@media (max-width: 800px) {
  .layout { grid-template-columns: 1fr; gap: 16px; }
  .toc { position: static; }
  .top .links a:not(.button) { display: none; }
}

.guide-shot { margin: 24px 0 8px; width: 200px; }
.guide-shot .frame { background: var(--navy); border-radius: 26px; padding: 7px; box-shadow: 0 12px 28px rgba(15, 27, 51, 0.18); }
.guide-shot img { display: block; width: 100%; height: auto; border-radius: 20px; }
.guide-shot figcaption { font-size: 13px; color: var(--muted); margin-top: 10px; line-height: 1.4; }
.step { display: grid; grid-template-columns: minmax(0, 1fr) 200px; gap: 32px; align-items: start; }
.step h2 { margin-top: 28px; }
.step .guide-shot { margin-top: 44px; }
@media (max-width: 800px) { .step { grid-template-columns: 1fr; gap: 0; } .step .guide-shot { margin-top: 8px; } }