/* ---------------------------------------------------------------------------
   Upsert Labs — landing page styles
   Minimal greyscale theme with a single green accent.
   --------------------------------------------------------------------------- */

:root {
  /* Greyscale ramp */
  --grey-950: #0f1211;
  --grey-900: #171a19;
  --grey-800: #23282a;
  --grey-600: #4b5250;
  --grey-500: #6b7370;
  --grey-400: #9aa19e;
  --grey-300: #c7ccca;
  --grey-200: #e4e7e6;
  --grey-100: #f2f4f3;
  --grey-050: #fafbfa;
  --white: #ffffff;

  /* Green accent */
  --accent: #1f9c6b;
  --accent-strong: #178056;
  --accent-soft: #e5f4ee;

  /* Semantic tokens (light) */
  --bg: var(--grey-050);
  --bg-alt: var(--grey-100);
  --surface: var(--white);
  --text: var(--grey-900);
  --text-muted: var(--grey-500);
  --border: var(--grey-200);

  --maxw: 1080px;
  --radius: 10px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: var(--grey-950);
    --bg-alt: var(--grey-900);
    --surface: var(--grey-900);
    --text: var(--grey-100);
    --text-muted: var(--grey-400);
    --border: var(--grey-800);
    --accent: #35c78d;
    --accent-strong: #2fb681;
    --accent-soft: #12241c;
  }
}

/* ------------------------------------------------------------------ base --- */

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3 {
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0;
}

a { color: inherit; text-decoration: none; }

.accent { color: var(--accent); }

/* ---------------------------------------------------------------- header --- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 1.05rem;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--white);
  font-size: 0.95rem;
}

.brand.small { font-size: 0.95rem; }

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 0.94rem;
}

.nav a { color: var(--text-muted); transition: color 0.15s ease; }
.nav a:hover { color: var(--text); }

/* ----------------------------------------------------------------- button -- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.05s ease, background 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
}

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent);
  color: var(--white);
}
.btn-primary:hover { background: var(--accent-strong); }

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover { border-color: var(--grey-400); }

.btn-ghost {
  padding: 8px 16px;
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ------------------------------------------------------------------- hero -- */

.hero {
  padding: 96px 0 80px;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 20px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.hero h1 {
  font-size: clamp(2.1rem, 5vw, 3.4rem);
  font-weight: 800;
  max-width: 900px;
  margin: 0 auto;
}

.lede {
  max-width: 640px;
  margin: 24px auto 0;
  font-size: 1.12rem;
  color: var(--text-muted);
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  margin-top: 36px;
  flex-wrap: wrap;
}

.hero-note {
  margin-top: 20px;
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* --------------------------------------------------------------- sections -- */

.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); }

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 48px;
}

/* steps */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.step {
  padding: 28px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.step-num {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 14px;
  letter-spacing: 0.04em;
}

.step h3, .feature h3 {
  font-size: 1.12rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step p, .feature p { margin: 0; color: var(--text-muted); font-size: 0.97rem; }

/* features */
.features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.feature {
  padding: 28px;
  border-radius: var(--radius);
  border-left: 3px solid var(--accent);
  background: var(--surface);
}

/* --------------------------------------------------------------------- cta -- */

.cta { text-align: center; }

.cta-inner { max-width: 560px; }

.cta h2 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  font-weight: 700;
}

.cta p { color: var(--text-muted); margin-top: 12px; }

.coming-soon {
  display: inline-block;
  margin-bottom: 20px;
  padding: 6px 16px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* non-interactive "Coming soon" pill in the header */
.btn.is-static {
  cursor: default;
  color: var(--accent);
  border-color: var(--accent);
}
.btn.is-static:active { transform: none; }

/* ------------------------------------------------------------------ footer -- */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.copyright { margin: 0; color: var(--text-muted); font-size: 0.88rem; }

/* ------------------------------------------------------------- responsive -- */

@media (max-width: 820px) {
  .steps { grid-template-columns: 1fr; }
  .features { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .nav a:not(.btn) { display: none; }
  .hero { padding: 64px 0 56px; }
  .section { padding: 56px 0; }
  .waitlist-form { flex-direction: column; }
}