/* ============================================================
   MAIN — layout shell, nav, footer, buttons, shared typography
   Depends on tokens declared in theme.css.
   ============================================================ */

body {
  font-family: var(--font-sans), sans-serif;
  /* Compensates for the fixed nav (see .nav) so page content doesn't sit
     underneath it. */
  padding-top: 56px;
}

.container {
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container--narrow {
  max-width: var(--content-width-narrow);
}

.eyebrow {
  font-size: var(--text-xs);
  font-weight: var(--weight-semibold);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 var(--space-3);
}

.section {
  padding: var(--space-24) 0;
}

.section--subtle {
  background: var(--color-bg-subtle);
}

.section-head {
  max-width: 640px;
  margin: 0 auto var(--space-12);
  text-align: center;
}

.section-head h2 {
  font-size: var(--text-3xl);
  font-weight: var(--weight-bold);
  letter-spacing: -0.01em;
  line-height: var(--leading-tight);
  color: var(--color-ink-primary);
  margin: 0 0 var(--space-4);
}

.section-head p {
  font-size: var(--text-lg);
  color: var(--color-ink-secondary);
  line-height: var(--leading-relaxed);
  margin: 0;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-family: inherit;
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  line-height: 1;
  padding: 0.75rem 1.375rem;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--duration-fast) var(--ease-default),
              border-color var(--duration-fast) var(--ease-default),
              color var(--duration-fast) var(--ease-default),
              transform var(--duration-fast) var(--ease-default);
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-on-accent);
  border-color: var(--color-accent);
}
.btn-primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  color: var(--color-on-accent);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-ink-primary);
  border-color: var(--color-border);
}
.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-ghost {
  background: transparent;
  color: var(--color-ink-primary);
  border-color: transparent;
}
.btn-ghost:hover {
  color: var(--color-accent);
}

.btn-lg {
  padding: 0.9375rem 1.75rem;
  font-size: var(--text-base);
}

/* ── Nav — solid at top, collapses to a frosted-glass floating pill on
   scroll. Mechanism and timings copied exactly from the kyn-website /
   trs-website reference: fixed positioning, a threshold-triggered
   `.nav--scrolled` class, and matching transition/easing values. ── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding: 0 var(--space-6);
  background: var(--color-bg);
  border: none;
  border-radius: 0;
  box-shadow: none;
  transition:
    top 0.4s var(--ease-nav),
    left 0.4s var(--ease-nav),
    right 0.4s var(--ease-nav),
    border-radius 0.4s var(--ease-nav),
    background 0.35s var(--ease-nav),
    box-shadow 0.4s var(--ease-nav),
    padding 0.4s var(--ease-nav);
}

.nav--scrolled {
  top: 12px;
  left: 20%;
  right: 20%;
  border-radius: 99px;
  background: var(--nav-bg-scrolled);
  backdrop-filter: blur(28px) saturate(200%);
  -webkit-backdrop-filter: blur(28px) saturate(200%);
  box-shadow: var(--nav-shadow-scrolled);
  padding: 0 var(--space-2) 0 var(--space-5);
}

@media (max-width: 900px) {
  .nav--scrolled { top: 8px; left: 10px; right: 10px; }
}

@media (min-width: 901px) and (max-width: 1240px) {
  .nav--scrolled { top: 12px; left: 24px; right: 24px; }
}

.nav-inner {
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  letter-spacing: -0.01em;
  color: var(--color-accent);
}

.nav-logo:hover {
  color: var(--color-accent-hover);
}

.nav-logo-mark {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

/* ── Logo mark — inline SVG lockup icon shared by nav + footer. Colors are
   drawn from tokens rather than hardcoded so the mark tracks the theme;
   the light-theme values equal the brand deck's exact gradient/glyph hex. ── */
.logo-mark-stop-start {
  stop-color: var(--color-accent-secondary);
}

.logo-mark-stop-end {
  stop-color: var(--color-accent);
}

.logo-mark-glyph {
  stroke: var(--color-on-accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-links a {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-ink-secondary);
}

.nav-links a:hover {
  color: var(--color-ink-primary);
}

.nav-links a.nav-active {
  color: var(--color-ink-primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Text CTA → hides on scroll; icon CTA → shows on scroll, sized and
   positioned to nest inside the pill's own corner radius rather than
   overhang it (matches the kyn-website reference mechanism exactly). */
.nav-cta-icon {
  display: none;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-full);
  background: var(--color-accent);
  color: var(--color-on-accent);
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  text-decoration: none;
  transition: opacity var(--duration-fast) var(--ease-default),
              transform var(--duration-fast) var(--ease-default);
}

.nav-cta-icon:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

.nav--scrolled .nav-cta-text { display: none; }
.nav--scrolled .nav-cta-icon { display: flex; }

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--color-border);
  padding: var(--space-12) 0;
  background: var(--color-bg-subtle);
}

.footer-inner {
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
  text-align: center;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-base);
  font-weight: var(--weight-bold);
  color: var(--color-accent);
}

.footer-logo-mark {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-5);
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-ink-secondary);
}

.footer-links a:hover {
  color: var(--color-ink-primary);
}

.footer-note {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  max-width: 520px;
  line-height: var(--leading-relaxed);
}

.footer-copy {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

/* ── Feature card grid (shared by landing + why-us) ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-5);
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
}

.card-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--color-accent-soft);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-4);
}

.card h3 {
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  color: var(--color-ink-primary);
  margin: 0 0 var(--space-2);
}

.card p {
  font-size: var(--text-sm);
  color: var(--color-ink-secondary);
  line-height: var(--leading-relaxed);
  margin: 0;
}

/* ── Responsive ── */
@media (max-width: 860px) {
  .nav-links { display: none; }
  .section { padding: var(--space-16) 0; }
}

@media (max-width: 560px) {
  .container { padding: 0 var(--space-4); }
  .nav { padding: var(--space-3) var(--space-4); }
}