/* ══════════════════════════════════════════════════════════════════════════
   Landing — the public marketing page at `/`.  [Phase 10.5]
   ──────────────────────────────────────────────────────────────────────────
   This is the one signed-out page that does NOT lock its own palette the way
   auth.css does, and the difference is deliberate.

   auth.css pins the Light theme's four tokens because login/join/setup do not
   load base.html and therefore have no theme engine, no saved preference to
   read, and no CheckScheme to derive contrast-safe accents. That reasoning is
   about *those* pages having no runtime.

   The landing page has one. It extends base.html, so it inherits the theme
   engine, the saved preference, --accent-on and --accent-ink — which is what
   the Phase 10.5 brief means by "supports all themes". A returning visitor who
   set Midnight three months ago sees Midnight here, not a copper page that
   turns dark the instant they sign in.

   So every colour below is a design-system token or a color-mix of one. There
   are no literal colours in this file, which is the rule
   tests/test_ui_invariants.py enforces for every page on its MIGRATED ledger,
   and this page is on it.

   Layout note: everything is intrinsic — clamp() for type, auto-fit/minmax for
   the card grids — so there is exactly one media query in the file, for the
   hero's two-column split. Breakpoint-per-component is what produced the band
   of tablet widths that broke the nav row (see base.html's #primary-nav note).
   ══════════════════════════════════════════════════════════════════════════ */

.lp {
  /* Local rhythm tokens, so the vertical spacing of the page is one decision
     rather than forty. */
  --lp-section-y: clamp(3.5rem, 9vw, 7rem);
  --lp-gap: clamp(1rem, 2.5vw, 1.75rem);
  --lp-max: 72rem;
  --lp-radius: 16px;
}

.lp section { padding-block: var(--lp-section-y); }

.lp__inner {
  max-width: var(--lp-max);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

/* ── Hero ──────────────────────────────────────────────────────────────── */

.lp-hero {
  /* The accent wash is a mix rather than a fixed tint so it stays subtle on
     every theme: 7% of the accent over the page background reads as a warm
     glow on Light and as a faint lift on Midnight, instead of a copper band
     that fights fourteen of the sixteen palettes. */
  background:
    radial-gradient(120% 90% at 50% 0%,
      color-mix(in srgb, var(--red) 9%, transparent) 0%,
      transparent 62%);
  border-bottom: 1px solid var(--border);
}

.lp-hero__grid {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
  align-items: center;
}

@media (min-width: 60rem) {
  .lp-hero__grid { grid-template-columns: 1.15fr .85fr; }
}

.lp-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--accent-ink, var(--red));
  background: color-mix(in srgb, var(--red) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--red) 28%, transparent);
  border-radius: 999px;
  padding: .35rem .8rem;
  margin-bottom: 1.25rem;
}

.lp-hero h1 {
  font-size: clamp(2.1rem, 6vw, 3.6rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  font-weight: 700;
  margin: 0 0 1rem;
  color: var(--fg);
}

.lp-hero h1 .lp-accent { color: var(--accent-ink, var(--red)); }

.lp-hero__lede {
  font-size: clamp(1rem, 1.9vw, 1.2rem);
  line-height: 1.6;
  color: color-mix(in srgb, var(--fg) 72%, transparent);
  margin: 0 0 1.75rem;
  max-width: 34rem;
}

.lp-hero__art {
  display: flex;
  justify-content: center;
}

/* ── Calls to action ───────────────────────────────────────────────────── */

.lp-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  align-items: center;
}

.lp-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .8rem 1.5rem;
  border-radius: 10px;
  font-size: .95rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background .15s ease, border-color .15s ease, transform .15s ease;
}

.lp-btn:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 2px;
}

.lp-btn--primary {
  background: var(--red);
  /* --accent-on is what base.html's CheckScheme computed for this theme: the
     colour that actually clears 4.5:1 on the accent, rather than a guess at
     white or black. Fourteen of the sixteen themes disagree about which. */
  color: var(--accent-on, var(--panel));
}
.lp-btn--primary:hover { background: color-mix(in srgb, var(--red) 86%, var(--fg)); }

.lp-btn--ghost {
  background: var(--panel);
  color: var(--fg);
  border-color: var(--border);
}
.lp-btn--ghost:hover { border-color: var(--red); }

.lp-btn--quiet {
  background: transparent;
  color: color-mix(in srgb, var(--fg) 70%, transparent);
  padding-inline: .5rem;
}
.lp-btn--quiet:hover { color: var(--red); }

/* ── Trust strip ───────────────────────────────────────────────────────── */

.lp-trust {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin-top: 2rem;
  font-size: .82rem;
  color: color-mix(in srgb, var(--fg) 60%, transparent);
}

.lp-trust li {
  display: flex;
  align-items: center;
  gap: .4rem;
  list-style: none;
}

.lp-trust svg { color: var(--accent-ink, var(--red)); flex-shrink: 0; }

/* ── Section headings ──────────────────────────────────────────────────── */

.lp-head { max-width: 40rem; margin: 0 auto clamp(2rem, 4vw, 3rem); text-align: center; }

.lp-head h2 {
  font-size: clamp(1.5rem, 3.4vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -.015em;
  font-weight: 700;
  margin: 0 0 .75rem;
  color: var(--fg);
}

.lp-head p {
  font-size: 1rem;
  line-height: 1.6;
  color: color-mix(in srgb, var(--fg) 68%, transparent);
  margin: 0;
}

/* ── Feature cards ─────────────────────────────────────────────────────── */

.lp-grid {
  display: grid;
  gap: var(--lp-gap);
  /* auto-fit rather than a column count: the grid reflows at whatever width the
     content actually needs, so there is no breakpoint to get wrong and no
     orphaned single card on a tablet. */
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
}

.lp-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--lp-radius);
  padding: 1.6rem;
  display: flex;
  flex-direction: column;
  gap: .7rem;
}

.lp-card__icon {
  width: 2.5rem;
  height: 2.5rem;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: color-mix(in srgb, var(--red) 14%, transparent);
  color: var(--accent-ink, var(--red));
  margin-bottom: .3rem;
}

.lp-card h3 {
  font-size: 1.02rem;
  font-weight: 650;
  margin: 0;
  color: var(--fg);
}

.lp-card p {
  font-size: .9rem;
  line-height: 1.6;
  margin: 0;
  color: color-mix(in srgb, var(--fg) 70%, transparent);
}

/* ── Alternating detail rows ───────────────────────────────────────────── */

.lp-alt { background: color-mix(in srgb, var(--fg) 3%, transparent); }

.lp-split {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
}

@media (min-width: 60rem) {
  .lp-split { grid-template-columns: 1fr 1fr; }
  /* The second row reverses, so the mascot alternates sides down the page
     rather than forming a column of identical layouts. */
  .lp-split--flip .lp-split__art { order: -1; }
}

.lp-split h3 {
  font-size: clamp(1.3rem, 2.6vw, 1.75rem);
  line-height: 1.25;
  font-weight: 680;
  margin: 0 0 .75rem;
  color: var(--fg);
}

.lp-split p {
  font-size: .98rem;
  line-height: 1.65;
  color: color-mix(in srgb, var(--fg) 72%, transparent);
  margin: 0 0 1rem;
}

.lp-split ul { margin: 0; padding: 0; list-style: none; display: grid; gap: .6rem; }

.lp-split li {
  display: flex;
  gap: .6rem;
  font-size: .92rem;
  line-height: 1.5;
  color: color-mix(in srgb, var(--fg) 78%, transparent);
}

.lp-split li svg { color: var(--accent-ink, var(--red)); flex-shrink: 0; margin-top: .15rem; }

.lp-split__art { display: flex; justify-content: center; }

/* ── Closing CTA ───────────────────────────────────────────────────────── */

.lp-close { text-align: center; }

.lp-close .lp-cta-row { justify-content: center; }

.lp-close__panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--lp-radius);
  padding: clamp(2rem, 5vw, 3.5rem) clamp(1.25rem, 4vw, 3rem);
}

/* ── Footer ────────────────────────────────────────────────────────────── */

.lp-foot {
  border-top: 1px solid var(--border);
  padding-block: 2rem;
  font-size: .84rem;
  color: color-mix(in srgb, var(--fg) 55%, transparent);
}

.lp-foot__inner {
  max-width: var(--lp-max);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
}

/* ── Motion ────────────────────────────────────────────────────────────── */

@media (prefers-reduced-motion: no-preference) {
  .lp-btn:hover { transform: translateY(-1px); }
}