/* ---------------------------------------------------------------------------
   tend.ai. Shared styles for sub-pages & docs
   Kept small on purpose. The homepage has its own inlined styles.
--------------------------------------------------------------------------- */
@font-face {
  font-family: 'FH Lecturis Rounded';
  src: url('fonts/FHLecturisRoundedTest-Regular.otf') format('opentype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'FH Premier';
  src: url('fonts/FHPremierTest-Regular.otf') format('opentype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
:root {
  --bg: #0A0B0D;
  --bg-2: #101215;
  --bg-3: #16191D;
  --line: rgba(255,255,255,0.09);
  --line-2: rgba(255,255,255,0.16);
  --fg: #ECE7DE;
  --fg-dim: rgba(236,231,222,0.62);
  --fg-mute: rgba(236,231,222,0.38);
  --paper: #ECE7DE;
  --paper-ink: #14150F;
  --accent: oklch(0.78 0.012 70);
  --accent-ink: #14150F;
  --accent-soft: oklch(0.78 0.012 70 / 0.14);
}
html[data-variant="B"] {
  --accent: oklch(0.88 0.008 70);
  --accent-soft: oklch(0.88 0.008 70 / 0.14);
}
* { box-sizing: border-box; }
em, i, blockquote, cite, address { font-style: normal; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--fg);
}
body {
  font-family: 'FH Premier', 'IBM Plex Sans', system-ui, sans-serif;
  font-weight: 400;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
a { color: inherit; }
.mono { font-family: 'IBM Plex Mono', ui-monospace, monospace; }
h1, h2, h3, h4, h5, h6 {
  font-family: 'FH Lecturis Rounded', 'IBM Plex Sans', system-ui, sans-serif;
}
.serif {
  font-family: 'FH Lecturis Rounded', 'IBM Plex Sans', system-ui, sans-serif;
  font-weight: 400;
  letter-spacing: -0.015em;
  color: var(--accent);
}

/* ---------- layout ---------- */
.wrap { max-width: 1440px; margin: 0 auto; padding: 0 40px; }
.wrap-narrow { max-width: 1120px; margin: 0 auto; padding: 0 40px; }
.hair { height: 1px; background: var(--line); width: 100%; }
.meta {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-mute);
}
.meta strong { color: var(--fg-dim); font-weight: 500; }

/* ---------- nav ---------- */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 50;
  background: rgba(10,11,13,0.75);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 40px;
  max-width: 1440px; margin: 0 auto;
}
.brand {
  display: inline-flex; align-items: center;
  text-decoration: none;
  color: var(--fg);
  line-height: 0;
}
.brand img { height: 22px !important; width: auto !important; max-width: 140px !important; display: block; }
.brand.brand-sm img { height: 20px !important; max-width: 130px !important; }
.nav-links { display: flex; gap: 28px; font-size: 13px; }
.nav-links a {
  color: var(--fg-dim);
  text-decoration: none;
  font-family: 'IBM Plex Mono', monospace;
  letter-spacing: 0.02em;
}
.nav-links a:hover, .nav-links a.active { color: var(--fg); }
.nav-links a.active { color: var(--accent); }
.nav-cta {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  color: var(--bg);
  background: var(--fg);
  padding: 9px 16px;
  text-decoration: none;
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--fg);
  transition: background 0.15s, color 0.15s;
  cursor: pointer;
  line-height: normal;
  -webkit-appearance: none;
  appearance: none;
}
button.nav-cta, button.btn { font: inherit; }
button.nav-cta { font-family: 'IBM Plex Mono', monospace; font-size: 13px; line-height: normal; }
.nav-cta:hover { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.nav-right { display: inline-flex; align-items: center; gap: 10px; }
.nav-login {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  color: var(--fg);
  background: var(--bg-3);
  padding: 9px 16px;
  text-decoration: none;
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid var(--line-2);
  letter-spacing: 0.02em;
  line-height: normal;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
  cursor: pointer;
}
.nav-login:hover { background: var(--bg-2); border-color: var(--fg-dim); color: var(--fg); }

/* ---------- buttons ---------- */
.btn {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  letter-spacing: 0.02em;
  padding: 13px 20px;
  text-decoration: none;
  border: 1px solid var(--line-2);
  color: var(--fg);
  display: inline-flex; align-items: center; gap: 10px;
  transition: all 0.18s;
  cursor: pointer;
  background: transparent;
}
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.08); transform: translateY(-1px); }
.btn:hover { border-color: var(--fg-dim); }
.btn .arr { display: inline-block; transition: transform 0.2s; }
.btn:hover .arr { transform: translateX(3px); }

/* ---------- page header (sub-pages) ---------- */
.page-head {
  padding: 160px 0 80px;
  border-bottom: 1px solid var(--line);
  position: relative;
}
.page-head .kicker {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
}
.page-head h1 {
  font-weight: 300;
  font-size: clamp(48px, 6vw, 88px);
  line-height: 0.98;
  letter-spacing: -0.035em;
  margin: 0 0 28px;
  text-wrap: balance;
  max-width: 14ch;
}
.page-head h1 .serif { font-weight: 400; }
.page-head .lede {
  font-size: 19px;
  line-height: 1.5;
  color: var(--fg-dim);
  max-width: 640px;
  margin: 0;
  text-wrap: pretty;
}

/* ---------- generic section ---------- */
.sec { padding: 80px 0; border-top: 1px solid var(--line); }
.sec:first-of-type { border-top: none; }
.sec h2 {
  font-size: clamp(36px, 3.6vw, 56px);
  font-weight: 300;
  letter-spacing: -0.025em;
  line-height: 1.05;
  margin: 0 0 24px;
  text-wrap: pretty;
}
.sec h2 .serif { font-weight: 400; }
.sec .lede {
  font-size: 17px;
  color: var(--fg-dim);
  line-height: 1.55;
  max-width: 620px;
  margin: 0 0 40px;
}

/* ---------- footer ---------- */
footer {
  border-top: 1px solid var(--line);
  padding: 40px 0 32px;
  color: var(--fg-mute);
  margin-top: 80px;
}
.foot-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 24px;
}
.foot-row .col .h {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg);
  margin-bottom: 14px;
}
.foot-row .col a {
  display: block;
  color: var(--fg-dim);
  text-decoration: none;
  font-size: 14px;
  padding: 4px 0;
}
.foot-row .col a:hover { color: var(--fg); }
.foot-bottom {
  display: flex; justify-content: space-between; align-items: center;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.05em;
}

/* ---------- mobile nav toggle ---------- */
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--line-2);
  color: var(--fg);
  padding: 8px 10px;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  align-items: center;
  justify-content: center;
}
.nav-toggle svg { display: block; }
.nav-drawer { display: none; }
.nav.open .nav-toggle { background: var(--bg-3); }

/* ---------- small screens ---------- */
@media (max-width: 980px) {
  .wrap, .wrap-narrow { padding: 0 24px; }
  .nav-links { display: none; }
  .nav-right .nav-cta, .nav-right .nav-login { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav.open .nav-drawer {
    display: flex;
    flex-direction: column;
    background: rgba(10,11,13,0.96);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-top: 1px solid var(--line);
    padding: 4px 24px 20px;
  }
  .nav-drawer a:not(.nav-login) {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 15px;
    color: var(--fg);
    text-decoration: none;
    padding: 16px 0;
    border-bottom: 1px solid var(--line);
    letter-spacing: 0.02em;
  }
  .nav-drawer a.active { color: var(--accent); }
  .nav-drawer .drawer-cta-row {
    display: flex;
    gap: 10px;
    padding-top: 16px;
  }
  .nav-drawer .drawer-cta-row > * {
    flex: 1;
    justify-content: center;
  }
  .foot-row { grid-template-columns: 1fr 1fr; }
  .page-head { padding: 120px 0 56px; }
}