/* Guide page (/guide/). Builds on site.css: same canvas, one brand blue, grey text levels. */
.guide-hero { padding-bottom: 40px; }
.start-steps { max-width: 1040px; margin: 36px auto 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; counter-reset: step; text-align: left; }
.start-steps li { position: relative; min-width: 0; padding: 22px 22px 22px 70px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
.start-steps li::before { counter-increment: step; content: counter(step); position: absolute; left: 22px; top: 21px; width: 32px; height: 32px; display: grid; place-items: center; border-radius: 50%; background: var(--brand); color: #fff; font-weight: 700; font-size: 15px; }
.start-steps b { display: block; color: var(--ink); font-size: 17px; line-height: 1.4; }
.start-steps p { margin: 6px 0 0; color: var(--ink-2); font-size: 15px; line-height: 1.65; }
.guide-hero em, .guide-sec em { font-style: normal; color: var(--ink); }
.hero-tip { max-width: 1040px; margin: 18px auto 0; color: var(--ink-3); font-size: 15px; }
.hero-tip b { color: var(--ink); }

.guide-sec { padding: 72px 0 0; scroll-margin-top: 64px; }
.guide-sec:last-of-type { padding-bottom: 96px; }
.guide-sec > .wrap > .lead { margin-bottom: 28px; }
.guide-sec h3 { margin: 0 0 8px; font-size: 18px; color: var(--ink); }

.key-primary { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.key-card { min-width: 0; padding: 20px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
.key-card kbd { font-size: 16px; padding: 4px 12px; }
.key-card b { display: block; margin-top: 12px; color: var(--ink); font-size: 16px; }
.key-card p { margin: 4px 0 0; color: var(--ink-2); font-size: 14px; line-height: 1.6; }
.key-groups { margin-top: 14px; display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 12px; }
.key-group { min-width: 0; padding: 18px 20px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
.key-group h3 { font-size: 15.5px; }
.key-group dl { margin: 0; font-size: 14px; line-height: 1.55; color: var(--ink-2); }
.key-group dt { margin-top: 12px; white-space: nowrap; }
.key-group dt:first-child { margin-top: 0; }
.key-group dd { margin: 4px 0 0; }
.key-group small { display: block; color: var(--ink-3); font-size: 13px; }

.mode-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 14px; }
.mode-card { padding: 22px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
.mode-card p { margin: 0; color: var(--ink-2); font-size: 15px; }
.guide-shot { max-width: 860px; margin: 22px auto 0; }
.guide-shot img, .dual-card img { width: 100%; height: auto; border: 1px solid var(--line); border-radius: 12px; }
.guide-shot figcaption { margin-top: 10px; color: var(--ink-3); font-size: 14px; }
/* Click-to-enlarge (= domestic /tutorial/ lightbox) */
img[data-zoom] { cursor: zoom-in; }
img[data-zoom]:focus-visible { outline: 2px solid #9db8ff; outline-offset: 2px; }
.lightbox { position: fixed; inset: 0; z-index: 80; display: flex; align-items: center; justify-content: center; padding: 24px; background: rgba(5, 8, 14, .9); cursor: zoom-out; }
.lightbox[hidden] { display: none; }
.lightbox img { max-width: min(1536px, 96vw); max-height: 88vh; width: auto; height: auto; border-radius: 12px; cursor: default; }
.lightbox button { position: absolute; top: 16px; right: 18px; width: 44px; height: 44px; border: 0; border-radius: 50%; color: #fff; background: rgba(255, 255, 255, .16); font-size: 26px; line-height: 1; cursor: pointer; }
@media (max-width: 640px) { .lightbox { padding: 12px; } .lightbox img { max-width: 100%; } }

.dual-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.dual-card { min-width: 0; padding: 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); scroll-margin-top: 80px; }
.dual-card .tag { display: inline-block; margin-bottom: 10px; padding: 2px 10px; border: 1px solid var(--line-2); border-radius: 999px; color: var(--ink-3); font-size: 12.5px; font-weight: 600; }
.dual-card picture { display: block; margin: 12px 0 4px; }
.dual-card ol, .test-block ol { margin: 14px 0 0; padding-left: 20px; color: var(--ink-2); font-size: 15px; }
.dual-card li + li, .test-block li + li { margin-top: 8px; }
.test-block { margin-top: 16px; padding: 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
.guide-sec .callout { margin: 16px 0 0; }
.guide-sec .callout b { color: var(--ink); }

.guide-faq { margin-top: 18px; max-width: 860px; }
.guide-faq details p, .guide-faq details ul { color: var(--ink-2); font-size: 15.5px; }
.guide-faq details ul { margin: 10px 0 0; padding-left: 20px; }
.guide-faq details li + li { margin-top: 6px; }
.guide-faq details[hidden] { display: none; }
.faq-search { max-width: 860px; }
.faq-search input { width: 100%; min-height: 48px; padding: 10px 16px; border: 1px solid var(--line-2); border-radius: 12px; background: var(--card); color: var(--ink); font: inherit; font-size: 16px; }
.faq-search input:focus { outline: none; border-color: var(--brand); }
.faq-empty { margin: 14px 0 0; color: var(--ink-3); }

@media (max-width: 1024px) {
  .key-primary { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 860px) {
  .start-steps, .dual-grid { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .guide-sec { padding-top: 56px; }
  .key-primary { grid-template-columns: 1fr 1fr; gap: 10px; }
  .key-card { padding: 16px; }
  .mode-grid { grid-template-columns: 1fr; }
  .dual-card, .test-block { padding: 18px; }
}
/* Tutorial video + chapters (= domestic /tutorial/ #quickstart), dark theme */
.tutorial-video-shell { overflow: hidden; border: 1px solid var(--line-2); border-radius: 14px; background: var(--bg-2); }
.tutorial-video-shell video { display: block; width: 100%; aspect-ratio: 16 / 9; background: #000; }
.video-chapters { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; border-top: 1px solid var(--line); background: var(--line); }
.video-chapter { display: flex; align-items: baseline; gap: 10px; min-height: 48px; padding: 12px 16px; border: 0; background: var(--bg-2);
  color: var(--ink-2); font: inherit; font-size: 14px; text-align: left; cursor: pointer; }
.video-chapter time { flex: none; color: var(--ink-3); font-variant-numeric: tabular-nums; font-size: 13px; }
.video-chapter:hover { background: rgba(255, 255, 255, .04); color: var(--ink); }
.video-chapter.is-current { background: rgba(255, 255, 255, .07); color: var(--ink); }
.video-chapter:focus-visible { outline: 2px solid #89aacc; outline-offset: -2px; }
.video-chapter[hidden], .video-switch a[hidden] { display: none; }
.video-switch { margin: 0; padding: 12px 16px; border-top: 1px solid var(--line); font-size: 14px; }
.video-switch:has(a[hidden]) { display: none; }
@media (max-width: 700px) { .video-chapters { grid-template-columns: 1fr; } }