/* ============================================================================
   serp — marketing site sections (nav, hero, offer tabs, preview, sections,
   engine strip, features, pricing, CTA, footer). Depends on tokens+base.
   ========================================================================== */

/* One continuous frame keeps the homepage navigation, sections and footer aligned. */
.home-frame {
  position: relative;
  width: 100%;
  min-height: 100vh;
}
.home-frame > main {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
}
.home-frame::before {
  content: "";
  position: absolute;
  inset-block: 0;
  left: 50%;
  width: min(100%, var(--wrap));
  transform: translateX(-50%);
  border-inline: 1px solid var(--border);
  pointer-events: none;
  z-index: calc(var(--z-nav) + 1);
}

/* ── Nav ──────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: var(--z-nav);
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav__inner { display: flex; align-items: center; gap: 16px; height: var(--nav-h); }
.brand { display: inline-flex; align-items: center; gap: 8px; font-family: var(--font-serif); font-size: 17px; letter-spacing: 0.01em; }
.brand__mark { width: 15px; height: 15px; background: var(--brand-grad); -webkit-mask: url(/assets/mark.svg) center / contain no-repeat; mask: url(/assets/mark.svg) center / contain no-repeat; }
.nav__links { display: flex; gap: 22px; margin-left: 8px; }
.nav__links a { color: var(--text-secondary); font-size: 13px; transition: color var(--ease); }
.nav__links a[aria-current="page"], .nav__links a:hover { color: var(--text); }
.nav__signin { color: var(--text-secondary); font-size: 13px; transition: color var(--ease); }
.nav__signin:hover { color: var(--text); }
.lang-switch { display: inline-flex; align-items: center; gap: 2px; border: 1px solid var(--border); border-radius: var(--r); padding: 2px; }
.lang-switch__btn { font-family: var(--font-mono); font-size: 11px; line-height: 1; padding: 5px 7px; border: 0; border-radius: 2px; background: transparent; color: var(--text-secondary); cursor: pointer; transition: color var(--ease), background-color var(--ease); }
.lang-switch__btn:hover { color: var(--text); }
.lang-switch__btn[aria-current="true"] { background: var(--surface-3); color: var(--text); }
.nav__inner > .lang-switch { margin-left: auto; }
.nav__links + .btn { margin-left: auto; }
.lang-switch + .btn { margin-left: 4px; }
.nav__menu { display: none; }
.nav__menu summary { display: flex; align-items: center; justify-content: center; width: 32px; height: 32px; cursor: pointer; border: 1px solid var(--border); border-radius: var(--r); list-style: none; }
.nav__menu summary::-webkit-details-marker { display: none; }
.nav__menu[open] summary { background: var(--surface-2); }
.nav__menu nav { position: absolute; top: calc(var(--nav-h) - 1px); right: 20px; min-width: 180px; padding: 8px; border: 1px solid var(--border); border-radius: var(--r); background: var(--surface); box-shadow: 0 8px 24px rgb(0 0 0 / 10%); }
.nav__menu a { display: block; padding: 10px 12px; }
.nav__menu a:hover { background: var(--surface-2); }

/* ── Hero ─────────────────────────────────────── */
.hero { padding: 76px 0 44px; }
.hero__inner { text-align: center; }
.hero__title { max-width: 720px; margin: 14px auto 0; }
.hero__sub { max-width: 600px; margin: 14px auto 0; color: var(--text-secondary); }
.hero__cta { margin-top: 26px; display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }
.hero__meta { margin-top: 18px; font-family: var(--font-mono); font-size: var(--fs-label); letter-spacing: 0.02em; color: var(--text-secondary); }

/* ── Offer tabs ───────────────────────────────── */
.offer { padding-bottom: 8px; }
.tablist { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--border); border-bottom: 0; border-radius: var(--r-sharp) var(--r-sharp) 0 0; overflow: hidden; }
.tab { display: flex; flex-direction: column; align-items: flex-start; gap: 8px; min-height: 172px; padding: 22px; text-align: left; background: var(--surface); border: 0; border-left: 1px solid var(--border); color: var(--text); font-family: inherit; cursor: pointer; transition: background-color var(--ease); }
.tab:first-child { border-left: 0; }
.tab.is-selected { background: var(--surface-2); }
.tab:hover { background: var(--surface-2); }
.tab__name { font-family: var(--font-serif); font-size: 18px; line-height: 26px; }
.tab__meta { font-family: var(--font-mono); font-size: var(--fs-label); letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-secondary); }
.tab__desc { color: var(--text-secondary); max-width: 42ch; }
.tab__actions { display: flex; gap: 8px; margin-top: auto; padding-top: 14px; }
.home-offer .tablist { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.home-offer .tab { display: block; min-height: 0; padding: 12px; text-align: center; }
.home-example-desc { padding: 12px 20px; color: var(--text-secondary); border-bottom: 1px solid var(--border-strong); }

.tile { width: 30px; height: 30px; border-radius: var(--r-sharp); display: inline-flex; align-items: center; justify-content: center; }
.tile--brand { background: var(--brand); color: var(--brand-ink); }
.tile--accent { background: var(--accent-2); color: #fafafa; }

.tabpanel { border: 1px solid var(--border); border-radius: 0 0 var(--r-sharp) var(--r-sharp); overflow: hidden; }
.tabpanel[hidden] { display: none; }

/* ── Preview (editor chrome mock) ─────────────── */
.preview { background: var(--surface-inset); }
.preview__bar { display: flex; align-items: center; gap: 10px; padding: 9px 14px; background: var(--surface-3); border-bottom: 1px solid var(--border-strong); }
.dots { display: flex; gap: 6px; }
.dots i { width: 9px; height: 9px; border-radius: 50%; display: block; }
.dots i:nth-child(1) { background: #e0605d; }
.dots i:nth-child(2) { background: #e6b055; }
.dots i:nth-child(3) { background: #79b76a; }
.preview__label { font-family: var(--font-mono); font-size: var(--fs-label); color: var(--text-secondary); }
.preview__body { display: grid; grid-template-columns: 1fr 1fr; align-items: stretch; min-height: 360px; }
.preview__pane { min-width: 0; overflow: hidden; }
.preview__pane > pre.code { padding: 16px 20px 20px; }
.preview__pane--req { background: var(--surface-inset); border-right: 1px solid var(--border-strong); }
.preview__pane--res { background: var(--surface-3); box-shadow: inset 0 0 0 1.5px var(--brand); }
.preview__status { display: flex; align-items: center; gap: 14px; padding: 9px 14px; background: var(--surface-3); border-top: 1px solid var(--border-strong); font-family: var(--font-mono); font-size: var(--fs-label); color: var(--text-secondary); }
.preview__status-meta:last-child { margin-left: auto; }
.ok { color: var(--ok); display: inline-flex; align-items: center; gap: 6px; }
.ok::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }

/* ── Sections ─────────────────────────────────── */
.section { padding: var(--sp-8) 0; border-top: 1px solid var(--border); }
.section__head { max-width: 640px; margin-bottom: 28px; }
.section__title { margin-top: 12px; }
.section__lead { margin-top: 10px; color: var(--text-secondary); }
.section--cta { border-top: 1px solid var(--border); }

/* ── Engine strip ─────────────────────────────── */
.strip__row { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border: 1px solid var(--border); border-radius: var(--r-sharp); overflow: hidden; }
.engine { position: relative; padding: 18px; border-left: 1px solid var(--border); transition: background-color var(--ease); }
.engine:first-child { border-left: 0; }
.engine:hover { background: var(--surface-2); }
.engine__name { display: block; font-family: var(--font-serif); font-size: 17px; line-height: 24px; }
.engine__desc { display: block; margin-top: var(--sp-2); color: var(--text-secondary); padding-right: 16px; }
.engine__arrow { position: absolute; top: 16px; right: 14px; color: var(--text-secondary); font-size: 13px; transition: color var(--ease), transform var(--ease); }
.engine:hover .engine__arrow { color: var(--text); transform: translate(1px, -1px); }
.engine--soon { opacity: 0.72; }
.engine--soon .engine__arrow { display: none; }

/* ── Features ─────────────────────────────────── */
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.feature { border: 1px solid var(--border); border-radius: var(--r-sharp); padding: 18px; transition: border-color var(--ease); }
.feature:hover { border-color: var(--border-strong); }
.feature__ico { width: 26px; height: 26px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid var(--border-strong); border-radius: var(--r); color: var(--text-secondary); margin-bottom: 12px; }
.feature h3 { font-family: var(--font-sans); font-size: var(--fs-h3); line-height: var(--lh-h3); font-weight: 600; }
.feature p { margin-top: var(--sp-2); color: var(--text-secondary); }
.home-steps { list-style-position: inside; padding: 0; }
.home-steps h3 { display: inline; }
.pricing.home-pricing { align-items: stretch; }
.home-pricing .plan--trial { border-color: var(--brand); }
.home-pricing .plan__header { justify-content: flex-start; }
.home-pricing .plan ul { flex: 1; }
.home-pricing .btn:disabled { cursor: not-allowed; }
.home-faq { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 32px; }
.home-faq p { margin-top: 8px; color: var(--text-secondary); }
@media (max-width: 640px) { .home-faq { grid-template-columns: 1fr; } }

/* ── Code block ───────────────────────────────── */
.code-block { background: var(--surface-inset); border: 1px solid var(--border-strong); border-radius: var(--r-sharp); overflow: hidden; }
.code-block .code { padding: 20px; }
.code-block__bar { display: flex; align-items: center; gap: 10px; padding: 8px 12px; border-bottom: 1px solid var(--border-strong); background: var(--surface-3); }
.sdk-row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 16px; }
.sdk-row__label { font-family: var(--font-mono); font-size: var(--fs-label); letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-secondary); margin-right: 2px; }
.pill { font-family: var(--font-mono); font-size: var(--fs-meta); padding: 4px 10px; border: 1px solid var(--border-strong); border-radius: var(--r); color: var(--text); }
.sdk-row__note { color: var(--text-secondary); }

/* ── Pricing ──────────────────────────────────── */
.pricing { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; align-items: stretch; }
.plan { display: flex; flex-direction: column; gap: 8px; border: 1px solid var(--border); border-radius: var(--r-sharp); padding: 24px; transition: border-color var(--ease); }
.plan:hover { border-color: var(--border-strong); }
.plan--popular { border-color: var(--text); }
.plan__header { display: flex; align-items: center; gap: 10px; min-height: 24px; }
.plan__badge { align-self: flex-start; font-family: var(--font-mono); font-size: var(--fs-label); letter-spacing: 0.06em; text-transform: uppercase; color: var(--brand-ink); background: var(--brand); border-radius: var(--r); padding: 2px 7px; }
.plan__name { font-family: var(--font-serif); font-size: 17px; line-height: 24px; }
.plan__price { font-family: var(--font-serif); font-size: 30px; line-height: 38px; }
.plan__price small { font-family: var(--font-sans); font-size: var(--fs-meta); color: var(--text-secondary); }
.plan__desc { color: var(--text-secondary); }
.plan ul { list-style: none; padding: 0; margin: 8px 0 0; display: flex; flex-direction: column; gap: 8px; color: var(--text-secondary); }
.plan .btn { margin-top: auto; width: 100%; }

/* ── CTA band ─────────────────────────────────── */
.cta__box { border: 1px solid var(--border); border-radius: var(--r-sharp); background: var(--surface-2); padding: 48px 24px; text-align: center; }
.cta__box .section__title { margin-top: 12px; }
.cta__box .section__lead { margin-inline: auto; max-width: 460px; }
.cta__actions { display: flex; gap: 10px; justify-content: center; margin-top: 22px; flex-wrap: wrap; }

/* ── Footer ───────────────────────────────────── */
.footer { border-top: 1px solid var(--border); }
.footer__grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 24px; padding: 44px 0 32px; }
.footer__tag { margin-top: 10px; color: var(--text-secondary); max-width: 34ch; }
.footer__col h2 { font-family: var(--font-mono); font-size: var(--fs-label); letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-secondary); margin-bottom: 12px; font-weight: 400; }
.footer__col a { display: block; color: var(--text-secondary); margin-bottom: 8px; transition: color var(--ease); }
.footer__col a:hover { color: var(--text); }
.footer__bottom { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding: 16px 0; border-top: 1px solid var(--border); color: var(--text-secondary); font-size: var(--fs-meta); }
.theme-toggle { width: 30px; height: 30px; display: inline-flex; align-items: center; justify-content: center; border: 1px solid var(--border-strong); border-radius: var(--r); background: transparent; color: var(--text); cursor: pointer; transition: border-color var(--ease), color var(--ease); }
.theme-toggle:hover { border-color: var(--text); }

/* ── Doc page helpers ─────────────────────────── */
.doc-layout { display: grid; grid-template-columns: 220px 1fr; gap: 40px; padding: 40px 0; }
.doc-nav { position: sticky; top: calc(var(--nav-h) + 24px); align-self: start; }
.doc-nav h4 { font-family: var(--font-mono); font-size: var(--fs-label); text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-secondary); margin-bottom: 10px; font-weight: 400; }
.doc-nav a { display: block; color: var(--text-secondary); padding: 5px 0; font-size: 13px; }
.doc-nav a:hover { color: var(--text); }
.pricing-faq { display: flex; flex-direction: column; gap: 24px; max-width: 760px; }
.pricing-faq p { margin-top: 10px; }
.status-content { padding: 40px 0 72px; gap: 16px; }

.doc-body { min-width: 0; max-width: 720px; }
.doc-body > :is(p, ul, ol, dl, blockquote, pre, .table-wrap, .code-block, .code-sample, .alert, .card, .panel) { margin-block: var(--sp-4); }
.doc-body h2 { margin: 36px 0 16px; }
.doc-body h3 { margin: 24px 0 16px; }
.doc-body p { margin: 10px 0; color: var(--text-secondary); }
.doc-body pre { margin: 14px 0; }

/* ── Page head ────────────────────────────────── */
.use-cases-page { max-width: 1120px; }
.use-cases__catalog { border-top: 0; padding-top: 32px; }
.use-cases__grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
.use-case { display: flex; flex-direction: column; align-items: flex-start; padding: 24px; border: 1px solid var(--border); border-radius: var(--r-sharp); background: var(--surface); }
.use-case h2 { font-size: 18px; line-height: 26px; }
.use-case p { margin-top: 10px; max-width: 58ch; color: var(--text-secondary); }
.use-case__types { display: inline-block; margin-top: auto; padding-top: 20px; font-size: var(--fs-meta); color: var(--text-secondary); }
.use-case__types:hover { color: var(--text); }
.use-cases__integration { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); gap: 48px; align-items: start; }
.use-cases__integration .section__head { margin-bottom: 0; }
.use-cases__key-note { margin-top: 16px; color: var(--text-secondary); font-size: var(--fs-meta); }
.use-cases__guide { display: inline-block; margin-top: 20px; }
.use-cases__flow { margin: 0; padding: 0; list-style: none; counter-reset: flow-step; border: 1px solid var(--border); border-radius: var(--r-sharp); }
.use-cases__flow li { position: relative; padding: 20px 24px 20px 64px; counter-increment: flow-step; }
.use-cases__flow li + li { border-top: 1px solid var(--border); }
.use-cases__flow li::before { content: counter(flow-step, decimal-leading-zero); position: absolute; top: 20px; left: 24px; font-family: var(--font-mono); font-size: var(--fs-meta); color: var(--text-secondary); }
.use-cases__flow p { margin-top: var(--sp-2); color: var(--text-secondary); }
@media (max-width: 860px) {
  .use-cases__integration { grid-template-columns: 1fr; gap: 24px; }
}
@media (max-width: 640px) {
  .use-cases__grid { grid-template-columns: 1fr; gap: 16px; }
  .use-case { padding: 20px; }
}
.page-head { padding: 56px 0 8px; border-bottom: 1px solid var(--border); }
.page-head__title { margin-top: 12px; }
.page-head__lead { margin-top: 10px; color: var(--text-secondary); max-width: 640px; padding-bottom: 32px; }

/* ── Responsive ───────────────────────────────── */
@media (max-width: 860px) {
  .features, .pricing { grid-template-columns: 1fr 1fr; }
  .strip__row { grid-template-columns: 1fr 1fr; }
  .engine:nth-child(odd) { border-left: 0; }
  .engine:nth-child(n + 3) { border-top: 1px solid var(--border); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .doc-layout { grid-template-columns: 1fr; gap: 20px; }
  .doc-nav { position: static; }
}
@media (max-width: 640px) {
  .nav__links { display: none; }
  .nav--site .nav__inner { gap: 8px; }
  .nav--site .nav__signin { display: none; }
  .nav--site .nav__menu { display: block; }
  .hero { padding-top: 48px; }
  .tablist { grid-template-columns: 1fr; }
  .tab { border-left: 0; border-top: 1px solid var(--border); min-height: 0; }
  .tab:first-child { border-top: 0; }
  .home-offer .tab { border-top: 0; padding: 12px 8px; }
  .home-offer .tab + .tab { border-left: 1px solid var(--border); }
  .preview__body { grid-template-columns: 1fr; min-height: 0; }
  .preview__pane--req { border-right: 0; border-bottom: 1px solid var(--border-strong); }
  .features, .pricing { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; gap: 28px; }
  .section { padding: 44px 0; }
}