/* Kohentra — public site stylesheet. Sober B2B SaaS identity: no
   generic AI illustrations, no gradients-as-decoration, content-first. */

:root {
  color-scheme: light;
  --ink: #12161c;
  --ink-soft: #4b5563;
  --ink-faint: #6b7280;
  --paper: #ffffff;
  --paper-muted: #f5f6f8;
  --border: #e2e5ea;
  --accent: #1f4b8f;
  --accent-ink: #ffffff;
  --accent-soft: #eaf0fb;
  --radius: 8px;
  --wrap: 1120px;
  --wrap-narrow: 760px;
  font-size: 16px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-ink);
  padding: 0.75rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { line-height: 1.25; font-weight: 700; color: var(--ink); }
h1 { font-size: clamp(1.9rem, 1.5rem + 1.8vw, 2.75rem); margin: 0 0 1rem; }
h2 { font-size: clamp(1.4rem, 1.2rem + 0.8vw, 1.85rem); margin: 0 0 1rem; }
h3 { font-size: 1.1rem; margin: 0 0 0.5rem; }
p { margin: 0 0 1rem; color: var(--ink-soft); }

.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 1.25rem;
}
.wrap--narrow { max-width: var(--wrap-narrow); }

/* --- Header / nav --- */
.site-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(255,255,255,0.94);
  backdrop-filter: saturate(180%) blur(6px);
  z-index: 20;
}
.site-header__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.9rem 1.25rem;
}
.brand {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem 0.7rem;
  cursor: pointer;
}
.nav-toggle__bar,
.nav-toggle__bar::before,
.nav-toggle__bar::after {
  content: "";
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  position: relative;
}
.nav-toggle__bar::before { top: -6px; position: absolute; }
.nav-toggle__bar::after { top: 6px; position: absolute; }

.primary-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex: 1;
  justify-content: flex-end;
}
.primary-nav__list {
  display: flex;
  gap: 1.25rem;
  list-style: none;
  margin: 0; padding: 0;
}
.primary-nav__list a {
  color: var(--ink-soft);
  font-weight: 600;
  font-size: 0.95rem;
}
.primary-nav__list a:hover { color: var(--accent); text-decoration: none; }
.primary-nav__list a[aria-current="page"] { color: var(--ink); }

.primary-nav__actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lang-switch {
  display: flex;
  gap: 0.35rem;
  border-right: 1px solid var(--border);
  padding-right: 0.75rem;
  margin-right: 0.25rem;
}
.lang-switch__item {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--ink-faint);
  padding: 0.2rem 0.35rem;
  border-radius: 4px;
}
.lang-switch__item:hover { text-decoration: none; background: var(--paper-muted); }
.lang-switch__item.is-active { color: var(--accent); background: var(--accent-soft); }

.btn {
  display: inline-block;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 0.92rem;
  border: 1px solid transparent;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn--primary { background: var(--accent); color: var(--accent-ink); }
.btn--primary:hover { background: #173a70; }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--border); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

/* --- Hero --- */
.hero { padding: 4.5rem 0 3.5rem; }
.hero__eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  margin: 0 0 0.75rem;
}
.hero h1 { max-width: 18ch; }
.hero__lead { max-width: 58ch; font-size: 1.1rem; }
.hero__actions { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-top: 1.5rem; }

/* --- Sections --- */
.section { padding: 3.25rem 0; }
.section--muted { background: var(--paper-muted); }
.section__intro { max-width: 62ch; }
.section__more { margin-top: 1.5rem; }

.page-header { padding-top: 3.5rem; }
.page-header__intro { font-size: 1.05rem; max-width: 62ch; }

.plain-list { color: var(--ink-soft); padding-left: 1.25rem; }
.plain-list li { margin-bottom: 0.5rem; }

/* --- Steps (how it works) --- */
.steps {
  list-style: none;
  margin: 0; padding: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.steps__item {
  background: var(--paper);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}
.steps__index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem; height: 1.75rem;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 800;
  font-size: 0.85rem;
  margin-bottom: 0.6rem;
}
.steps__item p { margin-bottom: 0; font-size: 0.95rem; }

/* --- Use case cards --- */
.use-case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.use-case-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  background: var(--paper);
}
.use-case-card h3 { margin-bottom: 0.5rem; }
.use-case-card h3 a { color: var(--ink); }
.use-case-card p { font-size: 0.95rem; margin-bottom: 0.85rem; }
.use-case-card__link { font-weight: 700; font-size: 0.9rem; }

.use-case-status {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  margin-bottom: 1rem;
}

.use-case-detail__field {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--border);
}
.use-case-detail__field:last-child { border-bottom: none; }
.use-case-detail__field h2 { font-size: 1rem; margin-bottom: 0.35rem; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.03em; }
.use-case-detail__field p { margin-bottom: 0; }

.cta-band { text-align: center; }
.cta-band p { max-width: 50ch; margin-left: auto; margin-right: auto; }

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  margin-top: 2rem;
}
.site-footer__row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.site-footer p { margin: 0; font-size: 0.85rem; }
.site-footer__links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
  margin: 0; padding: 0;
  font-size: 0.85rem;
}

/* --- Responsive --- */
@media (max-width: 860px) {
  .steps { grid-template-columns: repeat(2, 1fr); }
  .use-case-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .primary-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: stretch;
    padding: 1rem 1.25rem 1.5rem;
    gap: 1rem;
  }
  .primary-nav.is-open { display: flex; }
  .primary-nav__list { flex-direction: column; gap: 0.9rem; }
  .primary-nav__actions { flex-direction: column; align-items: stretch; gap: 0.6rem; }
  .lang-switch { border-right: none; padding-right: 0; margin-right: 0; justify-content: center; }
  .steps { grid-template-columns: 1fr; }
  .use-case-grid { grid-template-columns: 1fr; }
  .hero { padding: 3rem 0 2.25rem; }
  .site-footer__row { flex-direction: column; align-items: flex-start; }
}