/*
 * ============================================================
 *  LAYOUT  —  css/layout.css
 *  Structural chrome: navigation bar and footer.
 *  Also includes generic grid/flex utility classes.
 * ============================================================
 */


/* ──────────────────────────────────────────
   NAVIGATION
────────────────────────────────────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  isolation: isolate;
  background: transparent;
  border-bottom: none;
  padding: 0 var(--section-pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  transition: box-shadow var(--transition-base);
  overflow: visible;
}

/* Slightly deeper shadow on scroll (class added by JS) */
.nav.is-scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 4px 24px rgba(91, 62, 168, 0.10);
}

/* Scroll progress bar — absolute at nav bottom, JS sets width */
.nav__progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: var(--gradient-primary);
  transition: width 0.12s linear;
  pointer-events: none;
  z-index: 1;
}

/* ── Logo ── */
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  transition: opacity var(--transition-fast);
  flex-shrink: 0;
}
.nav__logo:hover { opacity: 0.85; }

/* Dark circular badge holding the logo mark */
.nav__logo-badge {
  display: none;
}

.nav__logo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}

/* Brand wordmark next to the badge */
.nav__logo-name {
  font-family: var(--font-heading);
  font-size: 26px;
  font-weight: 800;
  color: var(--color-primary-dark);
  letter-spacing: -0.03em;
  line-height: 1;
  white-space: nowrap;
}

/* Legacy icon — no longer rendered but rule kept to avoid broken styles if referenced elsewhere */
.nav__logo-icon { display: none; }

/* ── Links ── */
.nav__links {
  display: flex;
  gap: var(--space-7);
  align-items: center;
}

.nav__links a {
  font-weight: var(--weight-semibold);
  color: var(--color-text-mid);
  font-size: var(--text-sm);
  letter-spacing: 0.01em;
  transition: color var(--transition-fast);
  position: relative;
}
.nav__links a:not(.nav__cta):hover { color: var(--color-primary); }

/* ── CTA button inside nav ── */
.nav__cta {
  background: var(--gradient-primary) !important;
  color: var(--color-white) !important;
  padding: var(--space-2) var(--space-6);
  border-radius: var(--radius-full);
  font-size: var(--text-sm) !important;
  font-weight: var(--weight-bold) !important;
  letter-spacing: 0.01em;
  box-shadow: var(--shadow-btn);
  transition:
    transform var(--transition-spring),
    box-shadow var(--transition-base) !important;
}
.nav__cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px var(--color-primary-glow) !important;
}

/* ── Hamburger (hidden on desktop, shown via responsive.css) ── */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
}

.nav__hamburger span {
  width: 24px;
  height: 2.5px;
  background: var(--color-primary);
  border-radius: 2px;
  display: block;
  transition: transform var(--transition-base), opacity var(--transition-base);
  transform-origin: center;
}

/* Hamburger → X animation */
.nav__hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}
.nav__hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav__hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/*
 * NOTE: .nav__links.is-open is intentionally defined only inside
 * the @media (max-width: 768px) block in responsive.css.
 */


/* ──────────────────────────────────────────
   FOOTER
────────────────────────────────────────── */

.footer {
  background: var(--color-dark);
  color: var(--color-dark-text);
  padding: 72px var(--section-pad-x) 32px;
}

.footer__top {
  display: grid;
  grid-template-columns: 2.2fr 1fr 1fr 1fr;
  gap: var(--space-12);
  margin-bottom: var(--space-14);
  padding-bottom: var(--space-14);
  border-bottom: 1px solid var(--color-dark-border);
}

/* Brand column */
.footer__brand .nav__logo {
  margin-bottom: var(--space-5);
}

/* Footer logo — larger, no circular container, dark background blends with footer */
.footer__logo-img {
  width: 80px;
  height: 80px;
  object-fit: contain;
  object-position: center;
  display: block;
  border-radius: var(--radius-full);
}

.footer__brand p {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  max-width: 272px;
  color: var(--color-dark-text);
}

.footer__social {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

/* Link columns */
.footer__col h4 {
  color: var(--color-white);
  font-size: var(--text-sm);
  font-weight: var(--weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-5);
}

.footer__col ul { list-style: none; }

.footer__col li { margin-bottom: var(--space-3); }

.footer__col a {
  font-size: var(--text-sm);
  color: var(--color-dark-text);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
  display: inline-block;
}
.footer__col a:hover {
  color: var(--color-primary-light);
  padding-left: 4px;
}

/* Bottom bar */
.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-sm);
  color: rgba(168, 159, 194, 0.65);
}


/* ──────────────────────────────────────────
   GENERIC UTILITY CLASSES
────────────────────────────────────────── */

/* Grid helpers */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-7); }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-7); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6); }

/* Text alignment */
.text-center { text-align: center; }

/* Constrained section header (e.g. pain section intro) */
.section-header--narrow {
  max-width: 660px;
  margin-inline: auto;
}

/* Section header center variant */
.section-header--center {
  text-align: center;
  margin-bottom: 0;
}

/* Margin helpers */
.mt-12 { margin-top: var(--space-12); }
.mt-8  { margin-top: var(--space-8); }


/* ──────────────────────────────────────────
   BACK-TO-TOP BUTTON
   Fixed floating button — appears after 400px scroll
────────────────────────────────────────── */

.back-to-top {
  position: fixed;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 48px;
  height: 48px;
  background: var(--gradient-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-btn);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(16px) scale(0.9);
  transition:
    opacity var(--transition-base),
    transform var(--transition-spring),
    box-shadow var(--transition-base);
  z-index: 90;
  pointer-events: none;
}

.back-to-top.is-visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.back-to-top:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-3px) scale(1.05);
}

.back-to-top:active {
  transform: scale(0.96);
}