body { margin: 0; background: var(--bg); color: var(--text); font-size: 15px; line-height: 1.65; }
a { color: var(--accent); text-underline-offset: 4px; }
a:hover { color: var(--text); }
.shell { max-width: 1160px; padding-inline: 32px; margin-inline: auto; }
.site-header { border-bottom: 1px solid var(--border); }
.site-header nav { min-height: 82px; display: flex; align-items: center; gap: 36px; position: relative; }
.brand { display: inline-flex; gap: 10px; align-items: center; color: var(--text); font-size: 17px; font-weight: 650; letter-spacing: -.4px; text-decoration: none; white-space: nowrap; }
.nav-links { margin-left: auto; display: flex; gap: 28px; }
.nav-links a, footer a { color: var(--muted); text-decoration: none; font-size: 14px; }
.nav-links a:hover, footer a:hover { color: var(--text); }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 24px; padding: 12px 18px; border: 1px solid var(--border); border-radius: 5px; color: var(--text); text-decoration: none; font-size: 14px; font-weight: 600; white-space: nowrap; transition: background .15s; }
.button:hover { background: #272c30; }
.button-primary { background: var(--action); border-color: var(--action); color: var(--action-text); }
.button-primary:hover { background: #f1f6fa; color: var(--action-text); }
.button-small { padding: 8px 14px; gap: 18px; }
.hero { display: grid; grid-template-columns: 1.1fr 1fr; gap: 70px; align-items: center; padding-block: 98px 80px; }
.eyebrow { color: var(--muted); font-size: 12px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; margin: 0 0 22px; }
h1 { font-size: clamp(42px, 4.7vw, 60px); font-weight: 620; letter-spacing: -.055em; line-height: 1.08; margin: 0 0 24px; }
.intro { font-size: 17px; line-height: 1.7; max-width: 450px; color: var(--muted); margin: 0; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 22px; margin-top: 30px; }
.text-link { font-size: 14px; font-weight: 500; text-decoration: none; }
.hero-note { color: var(--muted); font-size: 12px; margin: 16px 0 0; }
.chat-preview { margin: 0; background: var(--panel); border: 1px solid #3d444b; border-radius: 8px; overflow: hidden; }
.chat-preview figcaption { display: flex; justify-content: space-between; gap: 12px; padding: 18px 20px; border-bottom: 1px solid var(--border); font-size: 14px; font-weight: 600; }
.preview-label { color: var(--muted); font-weight: 400; font-size: 12px; }
.preview-topic { font-size: 12px; color: var(--muted); padding: 14px 20px 0; }
.preview-messages { padding: 24px 20px 30px; display: grid; gap: 24px; }
.preview-message { display: flex; gap: 12px; font-size: 13px; line-height: 1.55; }
.preview-message > div { flex: 1; min-width: 0; }
.initial { display: flex; align-items: center; justify-content: center; flex-shrink: 0; width: 30px; height: 30px; border-radius: 6px; background: #303942; color: #c0cfdc; font-size: 12px; font-weight: 600; }
.initial-alt { background: #353d35; color: #bac8b8; }
.message-author { display: flex; align-items: center; gap: 8px; font-size: 12px; font-weight: 600; }
.message-author span { font-size: 10px; font-weight: 400; color: var(--muted); margin-left: auto; }
.message-author .moderator-label { color: var(--accent); margin-left: 0; }
.preview-message p { margin: 4px 0 0; color: #ccd1d6; }
.preview-composer { margin: 0 16px; display: flex; justify-content: space-between; padding: 12px; border: 1px solid var(--border); background: var(--inset); border-radius: 5px; color: var(--muted); font-size: 12px; }
.preview-footer { padding: 13px 20px; display: flex; align-items: center; gap: 6px; color: var(--muted); font-size: 10px; }
.preview-footer > span:last-child { margin-left: auto; }
.status-dot { width: 5px; height: 5px; border-radius: 50%; background: var(--success); }
.byline { padding-bottom: 30px; color: var(--muted); font-size: 13px; }
.byline a { color: var(--text); text-decoration: none; }
.section { padding-block: 72px; border-top: 1px solid var(--border); scroll-margin-top: 24px; }
.section-heading { max-width: 540px; }
h2 { margin: 0 0 14px; font-size: 30px; line-height: 1.2; font-weight: 580; letter-spacing: -.035em; }
.section-heading .eyebrow { margin-bottom: 16px; }
.section-heading > p:not(.eyebrow) { color: var(--muted); margin: 0 0 20px; }
.features { display: grid; grid-template-columns: 1fr 1fr; gap: 38px 70px; margin-top: 44px; }
.features article { display: flex; gap: 20px; }
.feature-number { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; padding-top: 3px; }
h3 { margin: 0 0 10px; font-size: 16px; font-weight: 600; }
.features p { margin: 0 0 12px; color: var(--muted); font-size: 14px; }
.features a { font-size: 13px; text-decoration: none; }
.plan-section, .faq-section { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; }
.plan-table { width: 100%; border-collapse: collapse; font-size: 14px; font-variant-numeric: tabular-nums; }
.plan-table caption { text-align: left; font-size: 12px; color: var(--muted); padding-bottom: 16px; }
.plan-table th, .plan-table td { text-align: left; padding: 16px 12px; border-bottom: 1px solid var(--border); }
.plan-table th:first-child { padding-left: 0; }
.plan-table thead th { color: var(--text); font-weight: 600; }
.plan-table tbody th { font-weight: 400; color: var(--muted); }
.faq-list details { border-bottom: 1px solid var(--border); padding-block: 17px; }
.faq-list details:first-child { padding-top: 0; }
.faq-list summary { cursor: pointer; font-size: 14px; font-weight: 500; }
.faq-list p { font-size: 14px; color: var(--muted); margin: 14px 0 0; }
.closing { display: flex; align-items: center; justify-content: space-between; gap: 32px; padding-block: 56px; border-block: 1px solid var(--border); }
.closing h2 { font-size: 25px; }
.closing p { color: var(--muted); margin: 0; font-size: 14px; }
footer.shell { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-block: 30px 40px; color: var(--muted); font-size: 12px; }
footer nav { display: flex; flex-wrap: wrap; gap: 24px; }
footer a { font-size: 12px; }
.menu-toggle { display: none; }
.skip-link { position: fixed; left: 16px; top: -80px; padding: 10px 16px; background: var(--action); color: var(--action-text); z-index: 20; }
.skip-link:focus { top: 12px; }
@media (max-width: 850px) {
  .shell { padding-inline: 24px; }
  .hero { gap: 32px; padding-block: 64px; }
  .hero-actions { gap: 16px; }
  .nav-links { gap: 18px; }
  .site-header nav { gap: 24px; }
  .plan-section, .faq-section { gap: 36px; }
}
@media (max-width: 640px) {
  .shell { padding-inline: 20px; }
  .site-header nav { min-height: 72px; gap: 14px; flex-wrap: wrap; }
  .brand { font-size: 15px; gap: 7px; }
  .brand img { width: 24px; height: 24px; }
  .menu-toggle { display: block; margin-left: auto; background: transparent; color: var(--muted); border: 0; padding: 10px 0; font-size: 13px; cursor: pointer; }
  .site-header .button { padding: 7px 9px; font-size: 12px; gap: 8px; }
  .nav-links { display: none; order: 4; flex-basis: 100%; padding-bottom: 18px; }
  .nav-links.open { display: flex; }
  .hero { grid-template-columns: 1fr; gap: 40px; padding-block: 52px 36px; }
  h1 { font-size: 48px; }
  .intro { font-size: 16px; }
  .hero-actions { gap: 20px; }
  .byline { font-size: 12px; padding-bottom: 28px; }
  .section { padding-block: 44px; }
  h2 { font-size: 27px; }
  .features { grid-template-columns: 1fr; gap: 28px; margin-top: 32px; }
  .plan-section, .faq-section { grid-template-columns: 1fr; gap: 28px; }
  .closing { align-items: flex-start; flex-direction: column; padding-block: 40px; gap: 20px; }
  footer.shell { flex-direction: column; align-items: flex-start; gap: 14px; }
}