.intro { max-width: 54rem; }
.intro h1 { max-width: 18ch; }
.preview-layout { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(18rem, .75fr); gap: var(--bl-space-5); align-items: start; }
.preview-card { min-width: 0; }
.preview-card__header { display: flex; align-items: start; justify-content: space-between; gap: var(--bl-space-4); }
.preview-card__header h2 { margin: var(--bl-space-1) 0 0; font-size: var(--bl-font-size-xl); }
.mail-chrome { overflow: hidden; border: var(--bl-border-width) solid var(--bl-color-border); border-radius: var(--bl-radius-md); background: var(--bl-color-page); }
.mail-chrome__bar { display: flex; align-items: center; gap: var(--bl-space-1); min-height: 2.5rem; padding: 0 var(--bl-space-3); border-bottom: var(--bl-border-width) solid var(--bl-color-border); background: var(--bl-color-surface-subtle); }
.mail-chrome__label { margin-left: var(--bl-space-2); color: var(--bl-color-text-muted); font-size: var(--bl-font-size-xs); }
.mail-dot { width: .6rem; height: .6rem; border-radius: var(--bl-radius-full); }
.mail-dot--red { background: #d98278; }
.mail-dot--yellow { background: #d4aa58; }
.mail-dot--green { background: #6dac7c; }
.mail-chrome__meta { display: grid; gap: .2rem; padding: var(--bl-space-3); border-bottom: var(--bl-border-width) solid var(--bl-color-border); background: var(--bl-color-surface); }
.mail-chrome__meta span { color: var(--bl-color-text-muted); font-size: var(--bl-font-size-sm); }
.mail-chrome iframe { display: block; width: 100%; height: 760px; border: 0; background: #f4f3ee; }
.plain-text { min-height: 46rem; max-height: 49rem; overflow: auto; margin: 0; padding: var(--bl-space-4); border: var(--bl-border-width) solid var(--bl-color-border); border-radius: var(--bl-radius-md); background: var(--bl-color-page); color: var(--bl-color-text); font: .86rem/1.55 ui-monospace,SFMono-Regular,Menlo,monospace; white-space: pre-wrap; }
.safety-card { gap: var(--bl-space-4); }
.safety-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--bl-space-4); }
.safety-grid > div { padding-left: var(--bl-space-3); border-left: var(--bl-focus-width) solid var(--bl-theme-accent); }
.safety-grid p { margin: var(--bl-space-1) 0 0; color: var(--bl-color-text-muted); font-size: var(--bl-font-size-sm); }
.safety-card .field-hint { max-width: 75ch; margin: 0; }
@media (max-width: 52rem) { .preview-layout, .safety-grid { grid-template-columns: 1fr; } .mail-chrome iframe { height: 700px; } }
@media (max-width: 34rem) { .bl-header__inner { align-items: start; flex-direction: column; } .mail-chrome iframe { height: 740px; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }