/* Assistant8 landing — plain CSS, no build step, light/dark aware. */

:root {
  --bg: #ffffff;
  --bg-elevated: #f5f6fb;
  --text: #0b1020;
  --text-muted: #4b5169;
  --border: #e3e5ef;
  --brand: #4f46e5;
  --brand-strong: #4338ca;
  --brand-contrast: #ffffff;
  --radius: 14px;
  --wrap: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1020;
    --bg-elevated: #141a30;
    --text: #f4f5fb;
    --text-muted: #a4abc4;
    --border: #26304d;
    --brand: #7c74ff;
    --brand-strong: #9a93ff;
    --brand-contrast: #0b1020;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 20px;
}

a { color: var(--brand); }

/* Accessibility helpers */
.visually-hidden {
  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(--brand);
  color: var(--brand-contrast);
  padding: 10px 16px;
  border-radius: 0 0 var(--radius) 0;
  z-index: 10;
}
.skip-link:focus { left: 0; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(160%) 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;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
}
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--brand);
  color: var(--brand-contrast);
  font-size: 14px;
  letter-spacing: 0.5px;
}
.nav-cta {
  text-decoration: none;
  font-weight: 600;
  color: var(--text);
}
.nav-cta:hover { color: var(--brand); }

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  font-size: 1rem;
  transition: transform 0.05s ease, background 0.2s ease, border-color 0.2s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--brand);
  color: var(--brand-contrast);
}
.btn-primary:hover { background: var(--brand-strong); }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { border-color: var(--brand); color: var(--brand); }

/* Hero */
.hero { padding: 88px 0 64px; }
.hero-inner { max-width: 780px; }
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--brand);
  margin: 0 0 14px;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.1;
  margin: 0 0 20px;
  letter-spacing: -0.02em;
}
.lede {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-muted);
  margin: 0 0 32px;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }

/* Features */
.features { padding: 56px 0; background: var(--bg-elevated); }
.features h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin: 0 0 32px;
  letter-spacing: -0.01em;
}
.feature-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}
.feature {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.feature h3 { margin: 0 0 8px; font-size: 1.1rem; }
.feature p { margin: 0; color: var(--text-muted); }

/* Waitlist */
.waitlist { padding: 80px 0; }
.waitlist-inner { max-width: 560px; text-align: center; }
.waitlist h2 {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}
.waitlist-lede { color: var(--text-muted); margin: 0 0 28px; }
.waitlist-form {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}
.waitlist-form input {
  flex: 1 1 260px;
  min-width: 0;
  padding: 12px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
}
.waitlist-form input:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 30%, transparent);
}
.waitlist-status {
  flex-basis: 100%;
  margin: 6px 0 0;
  min-height: 1.4em;
  font-size: 0.95rem;
}
.waitlist-status.is-error { color: #d1435b; }
.waitlist-status.is-success { color: #16a34a; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  color: var(--text-muted);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.site-footer a { text-decoration: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
}