/* ============================================================
   Section 01 — Nav
   Fixed ink-glass bar, condenses on scroll, scroll-progress line,
   full-screen overlay menu on mobile. All selectors scoped under
   .sec-01-nav (plus a required body-scroll-lock state class the
   nav JS toggles while the mobile overlay is open).
   ============================================================ */

.sec-01-nav {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 200;
  font-family: var(--font-body);
}

/* --- Bar --- */
.sec-01-nav .sec-01-nav__bar {
  position: relative;
  /* Must paint above the mobile overlay (z-index 199) so the toggle stays clickable while the menu is open */
  z-index: 210;
  background: hsl(200 35% 6% / 0.62);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom: 1px solid hsl(0 0% 100% / 0.08);
  transition: background-color 400ms var(--ease-out), border-color 400ms var(--ease-out);
}

html.is-scrolled .sec-01-nav .sec-01-nav__bar {
  background: hsl(200 40% 5% / 0.86);
  border-bottom-color: hsl(0 0% 100% / 0.12);
  box-shadow: var(--shadow-soft);
}

.sec-01-nav .sec-01-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(1rem, 3vw, 2.5rem);
  height: var(--nav-h);
  transition: height 400ms var(--ease-out);
}

html.is-scrolled .sec-01-nav .sec-01-nav__inner {
  height: calc(var(--nav-h) - 18px);
}

/* --- Logo --- */
.sec-01-nav .sec-01-nav__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 0.9rem + 0.4vw, 1.35rem);
  letter-spacing: -0.01em;
  color: var(--text-on-ink);
  text-decoration: none;
  white-space: nowrap;
}

.sec-01-nav .sec-01-nav__logo-dot {
  width: 0.4em;
  height: 0.4em;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}

/* --- Center links --- */
.sec-01-nav .sec-01-nav__links {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 2vw, 2.25rem);
}

.sec-01-nav .sec-01-nav__link {
  position: relative;
  color: var(--text-on-ink-dim);
  font-weight: 500;
  font-size: 0.95rem;
  text-decoration: none;
  padding-block: 0.4rem;
  white-space: nowrap;
  transition: color 200ms var(--ease-out);
}

.sec-01-nav .sec-01-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 320ms var(--ease-out);
}

.sec-01-nav .sec-01-nav__link:hover,
.sec-01-nav .sec-01-nav__link:focus-visible {
  color: var(--text-on-ink);
}

.sec-01-nav .sec-01-nav__link:hover::after,
.sec-01-nav .sec-01-nav__link:focus-visible::after {
  transform: scaleX(1);
}

/* --- Multi-location slot (kept dark-safe if ever enabled) --- */
.sec-01-nav .sec-01-nav__locations { position: relative; }
.sec-01-nav .sec-01-nav__locations-toggle {
  background: none;
  border: none;
  color: var(--text-on-ink-dim);
  font: inherit;
  font-size: 0.95rem;
  cursor: pointer;
}
.sec-01-nav .sec-01-nav__locations-menu {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 0.75rem;
  min-width: 180px;
  background: var(--ink-2);
  border-radius: var(--radius-card);
  padding: 0.5rem;
  box-shadow: var(--shadow-lift);
}

/* --- Right actions --- */
.sec-01-nav .sec-01-nav__actions {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.5rem);
}

.sec-01-nav .sec-01-nav__phone {
  color: var(--text-on-ink-dim);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color 200ms var(--ease-out);
}
.sec-01-nav .sec-01-nav__phone:hover { color: var(--text-on-ink); }

.sec-01-nav .sec-01-nav__cta {
  padding-block: 0.7rem;
  font-size: 0.9rem;
  white-space: nowrap;
}

/* --- Scroll progress: clean straight bar driven by --scroll-progress --- */
.sec-01-nav .sec-01-nav__progress {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  overflow: hidden;
}

.sec-01-nav .sec-01-nav__progress-bar {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--accent);
  transform: scaleX(var(--scroll-progress, 0));
  transform-origin: left;
}

/* --- Hamburger toggle (mobile) --- */
.sec-01-nav .sec-01-nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.sec-01-nav .sec-01-nav__toggle-line {
  display: block;
  width: 24px;
  height: 2px;
  margin-inline: auto;
  background: var(--text-on-ink);
  border-radius: 2px;
  transition: transform 320ms var(--ease-spring), opacity 200ms var(--ease-out);
}

.sec-01-nav .sec-01-nav__toggle[aria-expanded="true"] .sec-01-nav__toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.sec-01-nav .sec-01-nav__toggle[aria-expanded="true"] .sec-01-nav__toggle-line:nth-child(2) {
  opacity: 0;
}
.sec-01-nav .sec-01-nav__toggle[aria-expanded="true"] .sec-01-nav__toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Full-screen ink overlay menu --- */
.sec-01-nav .sec-01-nav__overlay {
  position: fixed;
  inset: 0;
  z-index: 199;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: clamp(2.5rem, 8vh, 4rem);
  padding: calc(var(--nav-h) + 1.75rem) clamp(2rem, 8vw, 4rem) clamp(2rem, 8vw, 4rem);
  background: var(--ink);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 380ms var(--ease-out), visibility 380ms;
}

.sec-01-nav .sec-01-nav__overlay.is-open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.sec-01-nav .sec-01-nav__overlay-links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.sec-01-nav .sec-01-nav__overlay-link {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.25rem, 1.5rem + 5vw, 3.75rem);
  letter-spacing: -0.02em;
  color: var(--text-on-ink);
  text-decoration: none;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 420ms var(--ease-out), transform 420ms var(--ease-out);
  transition-delay: 0ms;
}

.sec-01-nav .sec-01-nav__overlay.is-open .sec-01-nav__overlay-link {
  opacity: 1;
  transform: none;
  transition-delay: calc(var(--i, 0) * 70ms + 80ms);
}

.sec-01-nav .sec-01-nav__overlay-footer {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
  opacity: 0;
  transition: opacity 420ms var(--ease-out);
  transition-delay: 380ms;
}

.sec-01-nav .sec-01-nav__overlay.is-open .sec-01-nav__overlay-footer {
  opacity: 1;
}

.sec-01-nav .sec-01-nav__overlay-phone {
  color: var(--text-on-ink-dim);
  font-weight: 600;
  font-size: 1.1rem;
  text-decoration: none;
}

/* Body scroll lock while the mobile overlay is open (state class set by js/sections/01-nav.js) */
body.sec-01-nav-lock {
  overflow: hidden;
}

/* --- Reduced motion: no slide/stagger, just fade --- */
html.reduced-motion .sec-01-nav .sec-01-nav__overlay-link,
html.reduced-motion .sec-01-nav .sec-01-nav__toggle-line,
html.reduced-motion .sec-01-nav .sec-01-nav__overlay {
  transition-duration: 1ms;
  transform: none;
}
html.reduced-motion .sec-01-nav .sec-01-nav__overlay.is-open .sec-01-nav__overlay-link {
  transition-delay: 0ms;
}

/* --- Breakpoint: mobile nav --- */
@media (max-width: 1200px) {
  .sec-01-nav .sec-01-nav__links,
  .sec-01-nav .sec-01-nav__phone,
  .sec-01-nav .sec-01-nav__cta {
    display: none;
  }
  .sec-01-nav .sec-01-nav__toggle {
    display: flex;
  }
}

@media (max-width: 480px) {
  .sec-01-nav .sec-01-nav__overlay-footer {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* --- Desktop dropdowns (Services / What We Treat) --- */
.sec-01-nav .sec-01-nav__item { position: relative; display: flex; align-items: center; }

.sec-01-nav .sec-01-nav__link--parent {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.sec-01-nav .sec-01-nav__caret {
  transition: transform 250ms var(--ease-out);
  opacity: 0.7;
}

.sec-01-nav .sec-01-nav__item:hover .sec-01-nav__caret,
.sec-01-nav .sec-01-nav__item:focus-within .sec-01-nav__caret {
  transform: rotate(180deg);
  opacity: 1;
}

.sec-01-nav .sec-01-nav__dropdown {
  position: absolute;
  top: 100%;
  left: -0.75rem;
  margin-top: 0.9rem;
  min-width: 230px;
  padding: 0.5rem;
  background: var(--ink-2);
  border: 1px solid hsl(0 0% 100% / 0.1);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-lift);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 220ms var(--ease-out), transform 220ms var(--ease-out), visibility 220ms;
  z-index: 5;
}

/* Invisible hover bridge across the gap between link and panel */
.sec-01-nav .sec-01-nav__dropdown::before {
  content: "";
  position: absolute;
  top: -0.95rem;
  left: 0;
  right: 0;
  height: 1rem;
}

.sec-01-nav .sec-01-nav__item:hover .sec-01-nav__dropdown,
.sec-01-nav .sec-01-nav__item:focus-within .sec-01-nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.sec-01-nav .sec-01-nav__dropdown-link {
  display: block;
  padding: 0.55rem 0.85rem;
  border-radius: 10px;
  color: var(--text-on-ink-dim);
  font-size: 0.92rem;
  font-weight: 500;
  text-decoration: none;
  white-space: nowrap;
  transition: background-color 180ms var(--ease-out), color 180ms var(--ease-out);
}

.sec-01-nav .sec-01-nav__dropdown-link:hover,
.sec-01-nav .sec-01-nav__dropdown-link:focus-visible {
  background: hsl(0 0% 100% / 0.07);
  color: var(--text-on-ink);
}

.sec-01-nav .sec-01-nav__dropdown-link--all {
  margin-top: 0.3rem;
  border-top: 1px solid hsl(0 0% 100% / 0.1);
  border-radius: 0 0 10px 10px;
  color: hsl(var(--accent-h) 70% 62%);
  font-family: var(--font-display);
  font-weight: 600;
}

html.reduced-motion .sec-01-nav .sec-01-nav__dropdown,
html.reduced-motion .sec-01-nav .sec-01-nav__caret { transition: none; }

/* --- Mobile overlay groups (expandable sublists) --- */
.sec-01-nav .sec-01-nav__overlay { overflow-y: auto; justify-content: flex-start; }
.sec-01-nav .sec-01-nav__overlay-links { margin-block: auto; }

.sec-01-nav .sec-01-nav__overlay-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.sec-01-nav .sec-01-nav__overlay-expand {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: hsl(0 0% 100% / 0.06);
  border: 1px solid hsl(0 0% 100% / 0.15);
  border-radius: 50%;
  color: var(--text-on-ink);
  cursor: pointer;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 420ms var(--ease-out), transform 420ms var(--ease-out),
    background-color 200ms var(--ease-out);
}

.sec-01-nav .sec-01-nav__overlay.is-open .sec-01-nav__overlay-expand {
  opacity: 1;
  transform: none;
  transition-delay: calc(var(--i, 0) * 70ms + 80ms), calc(var(--i, 0) * 70ms + 80ms), 0ms;
}

.sec-01-nav .sec-01-nav__overlay-expand svg {
  transition: transform 250ms var(--ease-out);
}

.sec-01-nav .sec-01-nav__overlay-group.is-expanded .sec-01-nav__overlay-expand svg {
  transform: rotate(180deg);
}

.sec-01-nav .sec-01-nav__overlay-sub {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 320ms var(--ease-out);
}

.sec-01-nav .sec-01-nav__overlay-group.is-expanded .sec-01-nav__overlay-sub {
  grid-template-rows: 1fr;
}

.sec-01-nav .sec-01-nav__overlay-sub-inner {
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.sec-01-nav .sec-01-nav__overlay-sub-inner a {
  padding: 0.55rem 0 0.55rem 1.25rem;
  color: var(--text-on-ink-dim);
  font-size: 1.05rem;
  font-weight: 500;
  text-decoration: none;
  border-left: 2px solid hsl(0 0% 100% / 0.12);
  transition: color 200ms var(--ease-out), border-color 200ms var(--ease-out);
}

.sec-01-nav .sec-01-nav__overlay-sub-inner a:hover,
.sec-01-nav .sec-01-nav__overlay-sub-inner a:focus-visible {
  color: var(--text-on-ink);
  border-left-color: var(--accent);
}

html.reduced-motion .sec-01-nav .sec-01-nav__overlay-sub,
html.reduced-motion .sec-01-nav .sec-01-nav__overlay-expand { transition: none; }

/* --- Image logo (optional) ---
   The default logo is a text wordmark. To use a client's real logo, swap the wordmark in
   sections/01-nav.html for:
     <a href="/" class="sec-01-nav__logo" aria-label="[CLINIC_NAME_PLACEHOLDER] home">
       <img class="sec-01-nav__logo-img" src="assets/images/logo.webp"
            alt="[CLINIC_NAME_PLACEHOLDER]" width="560" height="166">
     </a>
   Height-driven so it tracks the bar's scrolled shrink. Supply a white/knockout logo:
   the bar is dark in every state. */
.sec-01-nav .sec-01-nav__logo-img {
  height: clamp(30px, 2.4vw, 38px);
  width: auto;
  display: block;
  transition: height 400ms var(--ease-out);
}
html.is-scrolled .sec-01-nav .sec-01-nav__logo-img {
  height: clamp(26px, 2vw, 32px);
}

/* --- Long dropdowns ---
   A client with many condition/service pages produces a tall single-column dropdown that
   can run off a laptop screen. Add sec-01-nav__dropdown--cols2 to the panel for two
   columns; the max-height is a backstop for anything longer still.
   NOTE: if you add TOP-LEVEL nav items, or the clinic name is long, re-check the desktop
   row just above the hamburger breakpoint and raise it if the CTA clips. The breakpoint is
   1200px because the row (logo + 4 links + phone + CTA) needs about 1200px once the logo is
   a full clinic name; it used to be 900px, which left the CTA overflowing the container
   from 901px up to ~1200px on every load. The shrink guards below keep a longer-than-usual
   name from breaking the row outright, but an image logo is the better answer. */
.sec-01-nav .sec-01-nav__inner { flex-wrap: nowrap; }
.sec-01-nav .sec-01-nav__logo {
  min-width: 0;
  flex-shrink: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.sec-01-nav .sec-01-nav__actions { flex-shrink: 0; }
.sec-01-nav .sec-01-nav__dropdown {
  max-height: calc(100vh - var(--nav-h) - 3rem);
  overflow-y: auto;
  overscroll-behavior: contain;
}
.sec-01-nav .sec-01-nav__dropdown--cols2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(200px, 1fr));
  gap: 0 1rem;
  min-width: 470px;
}
.sec-01-nav .sec-01-nav__dropdown--cols2 .sec-01-nav__dropdown-link--all {
  grid-column: 1 / -1;
}