/* ==========================================================================
   landing.css — styles for the marketing landing page (index.html) ONLY.

   Loads AFTER css/main.css and builds on its design tokens (--ca-*): the
   palette (including the brand ramp overridden at runtime by brand.js),
   typography, spacing, radii, and shadows all come from main.css, so the
   landing automatically tracks brand + light/dark theme changes. Course
   pages must NOT load this file.

   Conventions:
   - Every selector here is prefixed .ca-land (or scoped under body.ca-land)
     so nothing can leak into course-page styles.
   - No new JS, no external assets, no web fonts: the landing must stay a
     fast, static page.
   ========================================================================== */

/* The landing is a single-column document, not the sidebar app shell. */
body.ca-land {
  display: block;
}

/* Shared centered wrapper — wider than the course's reading column. */
.ca-land-wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 var(--ca-space-5);
}

/* ---------- Header --------------------------------------------------------- */
.ca-land-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--ca-bg) 88%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--ca-border);
}
.ca-land-header-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: var(--ca-space-3) var(--ca-space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--ca-space-4);
  flex-wrap: wrap;
}
.ca-land-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--ca-space-2);
  text-decoration: none;
  color: var(--ca-text);
}
.ca-land-brand img { width: 32px; height: 32px; }
.ca-land-brand-name {
  font-weight: 800;
  letter-spacing: -0.01em;
  font-size: var(--ca-fs-lg);
}
.ca-land-nav {
  display: flex;
  align-items: center;
  gap: var(--ca-space-4);
  flex-wrap: wrap;
}
.ca-land-nav > a {
  color: var(--ca-text-muted);
  text-decoration: none;
  font-weight: 600;
  font-size: var(--ca-fs-sm);
}
.ca-land-nav > a:hover { color: var(--ca-brand-strong); }

/* Auth slot: an empty slot (pre-auth-script) collapses to nothing. */
.ca-land-auth { display: inline-flex; align-items: center; gap: var(--ca-space-2); }
.ca-land-auth:empty { display: none; }
.ca-land-auth-cta { font-size: var(--ca-fs-sm); padding: var(--ca-space-2) var(--ca-space-4); }

/* ---------- Hero ------------------------------------------------------------ */
.ca-land-hero {
  padding: var(--ca-space-8) 0 var(--ca-space-7);
  text-align: center;
  /* Subtle brand wash that adapts to theme via the token ramp. */
  background:
    radial-gradient(1100px 480px at 50% -180px,
      color-mix(in srgb, var(--ca-brand-soft) 80%, transparent),
      transparent 70%);
  border-bottom: 1px solid var(--ca-border);
}
.ca-land-hero-eyebrow { justify-content: center; }
.ca-land-hero h1 {
  font-size: clamp(var(--ca-fs-2xl), 4.5vw, 3rem);
  line-height: var(--ca-lh-tight);
  letter-spacing: -0.02em;
  margin: var(--ca-space-2) auto var(--ca-space-4);
  max-width: 21ch;
}
.ca-land-hero-sub {
  font-size: var(--ca-fs-lg);
  line-height: 1.55;
  color: var(--ca-text-muted);
  max-width: 58ch;
  margin: 0 auto var(--ca-space-5);
}
.ca-land-cta-row {
  display: flex;
  justify-content: center;
  gap: var(--ca-space-3);
  flex-wrap: wrap;
}
.ca-land-cta { padding: var(--ca-space-3) var(--ca-space-5); }
.ca-land-hero-note {
  margin: var(--ca-space-4) 0 0;
  font-size: var(--ca-fs-sm);
  color: var(--ca-text-faint);
}

/* ---------- Sections --------------------------------------------------------- */
.ca-land-section { padding: var(--ca-space-7) 0; }
.ca-land-section--alt {
  background: var(--ca-bg-sunken);
  border-top: 1px solid var(--ca-border);
  border-bottom: 1px solid var(--ca-border);
}
.ca-land-section h2 {
  font-size: var(--ca-fs-2xl);
  letter-spacing: -0.01em;
  margin: 0 0 var(--ca-space-3);
}
.ca-land-section-lede {
  color: var(--ca-text-muted);
  max-width: 68ch;
  margin: 0 0 var(--ca-space-5);
}
.ca-land-footnote {
  color: var(--ca-text-faint);
  font-size: var(--ca-fs-sm);
  max-width: 68ch;
  margin: var(--ca-space-5) 0 0;
}

/* Responsive card grids. auto-fit keeps rows balanced from 1 → 3 columns. */
.ca-land-grid {
  display: grid;
  gap: var(--ca-space-4);
}
.ca-land-grid--3 {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.ca-land-feature h3 { margin: 0 0 var(--ca-space-2); font-size: var(--ca-fs-lg); }
.ca-land-feature p { margin: 0; color: var(--ca-text-muted); font-size: var(--ca-fs-sm); }

/* ---------- Tier cards -------------------------------------------------------- */
.ca-land-tier {
  display: flex;
  flex-direction: column;
  gap: var(--ca-space-2);
}
.ca-land-tier-kicker {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: var(--ca-fs-xs);
  font-weight: 700;
  color: var(--ca-brand-strong);
}
.ca-land-tier h3 { margin: 0; font-size: var(--ca-fs-xl); }
.ca-land-tier-desc {
  margin: 0;
  color: var(--ca-text-muted);
  font-size: var(--ca-fs-sm);
  flex: 1; /* pushes the CTA to a common baseline across cards */
}
.ca-land-tier-cta { margin-top: var(--ca-space-3); justify-content: center; text-align: center; }
.ca-land-tier--featured {
  border-color: var(--ca-brand);
  box-shadow: var(--ca-shadow-md);
  position: relative;
}

/* ---------- "How it works" points -------------------------------------------- */
.ca-land-point h3 { margin: 0 0 var(--ca-space-2); font-size: var(--ca-fs-base); }
.ca-land-point p { margin: 0; color: var(--ca-text-muted); font-size: var(--ca-fs-sm); }

/* ---------- Pricing band ------------------------------------------------------ */
.ca-land-section--band {
  background: var(--ca-brand-soft);
  border-top: 1px solid var(--ca-border);
}
.ca-land-band-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--ca-space-5);
  flex-wrap: wrap;
}
.ca-land-band-copy { margin: 0; color: var(--ca-text-muted); max-width: 52ch; }
.ca-land-band-ctas {
  display: flex;
  gap: var(--ca-space-3);
  flex-wrap: wrap;
}

/* ---------- Footer ------------------------------------------------------------ */
.ca-land-footer {
  border-top: 1px solid var(--ca-border);
  padding: var(--ca-space-6) 0;
}
.ca-land-footer .ca-legal { margin-top: 0; border-top: 0; padding-top: 0; }

/* ---------- Small screens ------------------------------------------------------ */
@media (max-width: 600px) {
  .ca-land-hero { padding: var(--ca-space-7) 0 var(--ca-space-6); }
  .ca-land-section { padding: var(--ca-space-6) 0; }
  .ca-land-cta-row .ca-land-cta { width: 100%; justify-content: center; }
  .ca-land-band-ctas { width: 100%; }
  .ca-land-band-ctas .ca-land-cta { width: 100%; justify-content: center; }
}

/* Respect reduced-motion (main.css handles most transitions; the sticky
   header blur is static, nothing here animates). */