/* /features/form-branding */
.fb-page :is(.fb-hero-grid, .fb-video-grid, .fb-how-grid, .fb-email-grid, .fb-figure) > * { min-width: 0; }
.fb-rail-wrap[hidden] { display: none; }
.fb-hero { padding-bottom: 48px; }
.fb-hero-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; align-items: center; margin-top: 16px; }
.fb-hero h1 { font-size: clamp(2.4rem, 5.4vw, 4rem); letter-spacing: -0.03em; }
.fb-hero-accent { color: var(--c-accent); }
.fb-hero-note { margin-top: 8px; }
.fb-hero-facts { list-style: none; margin: 0; padding: 0; border: 1px solid var(--c-border); border-radius: var(--radius-lg); background: #fff; box-shadow: var(--shadow-md); overflow: hidden; }
.fb-hero-facts li { display: grid; grid-template-columns: 110px 1fr; gap: 12px; padding: 14px 20px; border-top: 1px solid var(--c-border); align-items: baseline; }
.fb-hero-facts li:first-child { border-top: 0; }
.fb-fact-k { font-weight: 700; color: var(--c-primary); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.08em; }
.fb-fact-v { color: var(--c-text-muted); }

/* Showcase */
.fb-showcase { padding-top: 56px; }
.fb-stage { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.fb-figure { margin: 0; }
.fb-frame { background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-md); }
.fb-frame-bar { display: flex; align-items: center; gap: 6px; padding: 9px 14px; background: #f3f5f9; border-bottom: 1px solid var(--c-border); }
.fb-frame-bar span { width: 10px; height: 10px; border-radius: 50%; background: #d1d5db; }
.fb-frame-bar em { margin-left: 10px; font-style: normal; font-size: 0.75rem; font-weight: 600; color: var(--c-text-muted); }
.fb-zoom { position: relative; display: block; cursor: zoom-in; background: var(--c-bg-soft); }
.fb-zoom img { width: 100%; height: auto; }
.fb-zoom-hint { position: absolute; right: 12px; bottom: 12px; background: rgba(15,23,42,0.82); color: #fff; font-size: 0.78rem; font-weight: 600; padding: 6px 10px; border-radius: 999px; opacity: 0; transform: translateY(4px); transition: opacity .2s, transform .2s; }
.fb-zoom:hover .fb-zoom-hint, .fb-zoom:focus-visible .fb-zoom-hint { opacity: 1; transform: none; }
.fb-zoom:focus-visible { outline: 3px solid var(--c-accent); outline-offset: -3px; }
.fb-caption { padding: 16px 4px 0; }
.fb-caption-num { font-family: var(--font-mono); font-size: 0.78rem; color: var(--c-accent); font-weight: 600; }
.fb-caption h3 { margin: 4px 0 6px; }
.fb-caption p { margin: 0; color: var(--c-text-muted); }

/* Enhanced (JS) stage: one large slide + caption side panel */
.fb-enhanced .fb-stage { display: block; max-width: 980px; margin: 0 auto; }
.fb-enhanced .fb-slide { display: none; }
.fb-enhanced .fb-slide.is-active { display: block; animation: fbIn .35s ease both; }
.fb-enhanced .fb-figure { display: grid; grid-template-columns: minmax(0, 1fr) 260px; gap: 32px; align-items: start; }
.fb-enhanced .fb-caption { position: sticky; top: 96px; padding: 8px 0 0; border-left: 3px solid var(--c-accent); padding-left: 18px; }
.fb-enhanced .fb-caption h3 { font-size: 1.5rem; }
@keyframes fbIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

.fb-rail-wrap { margin: 0 auto 28px; max-width: 980px; }
.fb-rail { display: flex; gap: 10px; overflow-x: auto; padding: 6px 4px 12px; scroll-snap-type: x proximity; }
.fb-chip { flex: 0 0 auto; scroll-snap-align: start; display: flex; flex-direction: column; gap: 6px; align-items: stretch; width: 112px; padding: 6px; background: #fff; border: 1px solid var(--c-border); border-radius: 12px; cursor: pointer; font: inherit; color: var(--c-primary); transition: border-color .15s, box-shadow .15s, transform .15s; }
.fb-chip img { width: 100%; height: 60px; object-fit: contain; border-radius: 7px; background: var(--c-bg-soft); }
.fb-chip-label { font-size: 0.78rem; font-weight: 600; line-height: 1.25; text-align: left; }
.fb-chip:hover { border-color: var(--c-accent); transform: translateY(-1px); }
.fb-chip[aria-checked="true"] { border-color: var(--c-accent); box-shadow: 0 0 0 2px var(--c-accent); }
.fb-chip[aria-checked="true"] .fb-chip-label { color: var(--c-accent); }
.fb-chip:focus-visible { outline: 3px solid var(--c-accent); outline-offset: 2px; }
.fb-counter { margin: 4px 0 0; }

.fb-inspect { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; max-width: 980px; margin: 48px auto 0; }
.fb-inspect > div { background: var(--c-bg-soft); border: 1px solid var(--c-border); border-radius: var(--radius-lg); padding: 24px 28px; }
.fb-inspect h3 { font-size: 1.05rem; }
.fb-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.fb-list li { padding-left: 24px; position: relative; }
.fb-list li::before { position: absolute; left: 0; font-weight: 700; }
.fb-list-on li::before { content: "+"; color: var(--c-accent); }
.fb-list-off li::before { content: "="; color: var(--c-text-muted); }
.fb-disclosure { max-width: 980px; margin: 24px auto 0; padding: 14px 18px; border-left: 3px solid #f59e0b; background: #fffbeb; color: #78350f; border-radius: 0 var(--radius) var(--radius) 0; }

/* Dialog */
.fb-dialog { width: min(1200px, 96vw); max-height: 94vh; padding: 0; border: 0; border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); background: #fff; }
.fb-dialog::backdrop { background: rgba(15, 23, 42, 0.72); }
.fb-dialog-head { position: sticky; top: 0; display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 12px 18px; background: #fff; border-bottom: 1px solid var(--c-border); z-index: 1; }
.fb-dialog-title { font-size: 1rem; margin: 0; }
.fb-dialog-body { overflow: auto; max-height: calc(94vh - 60px); background: var(--c-bg-soft); }
.fb-dialog-body img { width: 100%; height: auto; }
.fb-original-size .fb-dialog-body img { width: 2880px; max-width: none; }
body.fb-dialog-open { overflow: hidden; }

/* Video */
.fb-video-grid { display: grid; grid-template-columns: 1fr 1.5fr; gap: 48px; align-items: center; }
.fb-video-frame video { width: 100%; height: auto; border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); background: #0f172a; }
.fb-video-desc { margin: 10px 0 0; }
.fb-transcript { margin-top: 16px; border: 1px solid var(--c-border); background: #fff; border-radius: var(--radius); padding: 12px 16px; }
.fb-transcript summary { cursor: pointer; font-weight: 600; color: var(--c-primary); }
.fb-transcript p { margin: 10px 0 0; color: var(--c-text-muted); }

/* How + email */
.fb-how-grid, .fb-email-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.fb-steps { margin: 0; padding: 0; list-style: none; counter-reset: fb; display: grid; gap: 14px; }
.fb-steps li { counter-increment: fb; position: relative; padding: 16px 18px 16px 60px; background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius); }
.fb-steps li::before { content: counter(fb); position: absolute; left: 18px; top: 14px; width: 28px; height: 28px; border-radius: 50%; background: var(--c-accent); color: #fff; font-weight: 700; display: flex; align-items: center; justify-content: center; font-size: 0.9rem; }
.fb-email-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.fb-email-list li { background: #fff; border: 1px solid var(--c-border); border-radius: var(--radius); padding: 14px 18px; color: var(--c-text-muted); }
.fb-email-list span { display: inline-block; min-width: 90px; font-weight: 700; color: var(--c-primary); }
.fb-caveat { border-top: 1px solid var(--c-border); padding-top: 12px; }
.fb-related-pages { text-align: center; margin-top: 32px; }

@media (max-width: 960px) {
  .fb-hero-grid, .fb-video-grid, .fb-how-grid, .fb-email-grid { grid-template-columns: 1fr; gap: 32px; }
  .fb-enhanced .fb-figure { grid-template-columns: 1fr; gap: 0; }
  .fb-enhanced .fb-caption { position: static; }
}
@media (max-width: 720px) {
  .fb-hero-facts li { grid-template-columns: 110px minmax(0, 1fr); padding: 12px; }
  .fb-dialog-head { flex-wrap: wrap; }
  .fb-dialog-title { flex-basis: 100%; }
  .fb-stage { grid-template-columns: 1fr; }
  .fb-inspect { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  .fb-enhanced .fb-slide.is-active { animation: none; }
  .fb-chip, .fb-zoom-hint { transition: none; }
  .fb-chip:hover { transform: none; }
}