/* ============================================================
   PT Template 3 — Base: reset, typography, shared components.
   Section-specific styles belong in css/sections/*.css, scoped
   under their section root class. Do NOT add section styles here.
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html { scroll-behavior: smooth; }
html.reduced-motion { scroll-behavior: auto; }

/* Anchored sections must clear the fixed nav when jumped to */
[id] { scroll-margin-top: calc(var(--nav-h) + 16px); }

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--text-on-bone);
  background: var(--bone);
  -webkit-font-smoothing: antialiased;
  overflow-x: clip;
}

img, svg, video, iframe { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; }
a { color: inherit; }
ul[class], ol[class] { list-style: none; padding: 0; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.05;
  letter-spacing: -0.02em;
  text-wrap: balance;
  font-weight: 700;
}
h1 { font-size: var(--fs-hero); font-weight: 800; }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }
h4 { font-size: var(--fs-h4); }

:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

/* --- Skip link: first focusable element on every page, hidden until focused --- */
.skip-link {
  position: absolute;
  top: -1000px;
  left: 1rem;
  z-index: 1000;
  background: var(--ink);
  color: var(--text-on-ink);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.85rem 1.4rem;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-lift);
  text-decoration: none;
}
.skip-link:focus {
  top: 1rem;
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

/* --- Layout --- */
.container {
  width: min(var(--container), 100% - 2.5rem);
  margin-inline: auto;
}

/* --- Section rhythm helpers --- */
.section-pad { padding-block: var(--sp-section); }
.on-ink { color: var(--text-on-ink); background: var(--ink); }
.on-ink h1, .on-ink h2, .on-ink h3, .on-ink h4 { color: var(--white); }

/* --- Eyebrow + section heading pattern --- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}
.eyebrow::before {
  content: "";
  width: 2rem;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}
.on-ink .eyebrow { color: hsl(var(--accent-h) 70% 62%); }
.on-ink .eyebrow::before { background: hsl(var(--accent-h) 70% 62%); }

.section-head { max-width: 46ch; margin-bottom: clamp(2rem, 4vw, 3.5rem); }
.section-head .eyebrow { margin-bottom: 1rem; }
.section-head p { margin-top: 1rem; color: var(--text-on-bone-dim); max-width: 52ch; }
.on-ink .section-head p { color: var(--text-on-ink-dim); }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.95rem 1.9rem;
  border-radius: var(--radius-pill);
  border: 2px solid transparent;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: 0.01em;
  text-decoration: none;
  cursor: pointer;
  transition: transform 300ms var(--ease-spring), box-shadow 300ms var(--ease-out),
    background-color 200ms var(--ease-out), color 200ms var(--ease-out),
    border-color 200ms var(--ease-out);
  will-change: transform;
}
.btn--solid { background: var(--accent); color: var(--accent-on); box-shadow: 0 8px 24px var(--accent-glow); }
.btn--solid:hover { background: var(--accent-strong); box-shadow: 0 12px 32px var(--accent-glow); }
.btn--ghost { border-color: currentColor; background: transparent; color: inherit; }
.btn--ghost:hover { background: hsl(0 0% 100% / 0.08); }
.btn .btn__arrow { transition: transform 300ms var(--ease-spring); }
.btn:hover .btn__arrow { transform: translateX(4px); }

/* --- Reveal-on-scroll (driven by js/core.js) --- */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--dur-reveal) var(--ease-out), transform var(--dur-reveal) var(--ease-out);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-visible { opacity: 1; transform: none; }
html.reduced-motion [data-reveal] { opacity: 1; transform: none; transition: none; }

/* --- No-JS fallback ---
   html starts with class="no-js" (set on every template's <html> tag); an
   inline script that is the first thing in <head> swaps it to "js" the
   instant JS runs, before any paint. If JS never runs, everything that
   js/core.js or a section's JS would otherwise progressively reveal must
   still render in its final, readable state. This is the mechanism, not
   just the reduced-motion backstop below: without it, [data-reveal]
   content (used on every section of every page) stays opacity:0 forever
   with JS disabled. */
html.no-js [data-reveal] { opacity: 1 !important; transform: none !important; }
html.no-js .pulse-line--draw path { stroke-dashoffset: 0 !important; transition: none !important; }
/* FAQ-style accordions (home/condition/service patterns): JS only flips
   aria-expanded on click, so with no JS every panel past the first stays
   collapsed forever. Force all three patterns open when JS never ran. */
html.no-js .sec-18-faq__panel,
html.no-js .sec-55-cond-faq__panel,
html.no-js .sec-65-serv-faq__panel {
  grid-template-rows: 1fr !important;
}
/* Booking form: the 5-step wizard hides steps 2-5 with the native `hidden`
   attribute and only JS advances between them. With no JS, unhide every
   step into one flat form and hide the JS-only pagination controls so the
   real submit button (in the now-visible last step) is reachable. */
html.no-js .sec-12-booking__step[hidden] { display: block !important; }
html.no-js .sec-12-booking__nav,
html.no-js .sec-12-booking__progress { display: none !important; }
/* 30-second Pain Check: a pure JS shortcut (chip taps -> sessionStorage ->
   hands off to the booking form below it). With no JS the chips are inert
   buttons and steps 2/3 can never be reached, so hide the whole teaser
   section (heading included, so nothing is left promising an interaction
   that can't happen); the real booking form on the same page is the
   fallback path to the same outcome. */
html.no-js .sec-15-paincheck { display: none !important; }

/* --- Marquee (duplicate .marquee__track content twice) --- */
.marquee { overflow: hidden; display: flex; }
.marquee__track {
  display: flex;
  align-items: center;
  gap: 3rem;
  flex-shrink: 0;
  min-width: 100%;
  padding-right: 3rem;
  animation: marquee-scroll var(--marquee-dur, 36s) linear infinite;
}
.marquee:hover .marquee__track { animation-play-state: paused; }
html.reduced-motion .marquee__track { animation: none; }
@keyframes marquee-scroll {
  from { transform: translateX(0); }
  to { transform: translateX(calc(-100% - 3rem)); }
}

/* --- Grain texture for dark sections --- */
.grain { position: relative; }
.grain::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}
.grain > * { position: relative; z-index: 1; }

/* --- Ghost numeral --- */
.ghost-num {
  font-family: var(--font-display);
  font-size: var(--fs-ghost);
  font-weight: 800;
  line-height: 0.8;
  color: transparent;
  -webkit-text-stroke: 1.5px hsl(0 0% 100% / 0.14);
  user-select: none;
  pointer-events: none;
}

/* --- Pulse-line brand motif (canonical EKG path lives in the addendum spec) --- */
.pulse-line { display: block; width: 100%; height: 44px; }
.pulse-line path {
  stroke: var(--accent);
  stroke-width: 2;
  vector-effect: non-scaling-stroke;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.pulse-line--draw path { stroke-dasharray: 1; stroke-dashoffset: 1; }
[data-reveal].is-visible .pulse-line--draw path,
.pulse-line--draw[data-reveal].is-visible path {
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 1400ms var(--ease-out) 200ms;
}
html.reduced-motion .pulse-line--draw path { stroke-dashoffset: 0; transition: none; }

/* --- Auto chapter numbers (injected by core.js into each .section-head) ---
   The track starts where the numeral has always sat (just above the
   eyebrow) and core.js stretches it to the bottom of the head's section
   via --chapter-run, so the sticky numeral stays in view while its
   section is on screen instead of scrolling away with the heading. */
.section-head { position: relative; }
.chapter-num {
  position: absolute;
  top: -0.55em;
  left: -0.06em;
  z-index: -1;
  height: var(--chapter-run, 1em);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(4.5rem, 3rem + 6vw, 7.5rem);
  line-height: 1;
  color: currentColor;
  opacity: 0.06;
  pointer-events: none;
  user-select: none;
}
.chapter-num__label {
  position: sticky;
  top: calc(var(--nav-h) + 0.75rem);
  display: block;
}

/* --- Chapter spine (injected by core.js, desktop only) --- */
.chapter-spine {
  position: fixed;
  left: 1.4rem;
  top: 50%;
  transform: translateY(-50%);
  z-index: 90;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #fff;
  mix-blend-mode: difference; /* legible on both bone and ink sections */
  pointer-events: none;
}
.chapter-spine__rail {
  width: 2px;
  height: 72px;
  background: hsl(0 0% 100% / 0.25);
  border-radius: 2px;
  overflow: hidden;
}
.chapter-spine__fill {
  display: block;
  width: 100%;
  height: 100%;
  background: #fff;
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 500ms var(--ease-out);
}
.chapter-spine__total { opacity: 0.55; }

/* --- Cursor-reactive glow (injected by core.js on section.on-ink) ---
   The layer is a clipping box the exact size of its section, so the glow
   can never spill into the section above/below or a neighbor's divider.
   It is the section's first child, so the section's own wave dividers
   (later siblings) always paint over it. */
.cursor-glow-layer {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}
.cursor-glow {
  position: absolute;
  top: -220px;
  left: -220px;
  width: 440px;
  height: 440px;
  z-index: 0;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow), transparent 62%);
  opacity: 0;
  pointer-events: none;
  transition: transform 700ms var(--ease-out), opacity 500ms var(--ease-out);
  will-change: transform, opacity;
}

/* --- Collapsible testimonial text: [data-clamp] (toggle added by core.js) ---
   Collapsed = a fixed 4-line box (short quotes reserve the same height so
   every card matches); only clamped when JS can offer "Read More". */
html.js [data-clamp] { --clamp-lines: 4; min-height: calc(var(--clamp-lines) * 1lh); }
html.js [data-clamp]:not(.is-expanded) {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: var(--clamp-lines);
  line-clamp: var(--clamp-lines);
  overflow: hidden;
}
.clamp-toggle {
  display: inline-block;
  margin-bottom: 0.9rem;
  padding: 0.2rem 0;
  background: none;
  border: 0;
  color: inherit;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: underline;
  text-underline-offset: 0.25em;
  cursor: pointer;
}
.clamp-toggle[hidden] { display: none; }

/* --- Back to top (injected by core.js on every page) --- */
.back-to-top {
  position: fixed;
  right: clamp(1rem, 2vw, 1.5rem);
  bottom: clamp(1rem, 2vw, 1.5rem);
  z-index: 170; /* under the mobile bar (180) and nav overlay (199) */
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border: 0;
  border-radius: 50%;
  background: var(--accent);
  color: var(--accent-on);
  /* white ring keeps it distinct on accent-red bands as well as ink/bone */
  box-shadow: 0 0 0 2px hsl(0 0% 100% / 0.9), var(--shadow-lift);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 300ms var(--ease-out), transform 300ms var(--ease-out),
    visibility 300ms, background-color 200ms var(--ease-out);
}
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.back-to-top:hover { background: var(--accent-strong); }
/* Mobile: clear the sticky Call | Book bar (56px + safe area) */
@media (max-width: 820px) {
  .back-to-top { bottom: calc(56px + env(safe-area-inset-bottom) + 0.85rem); }
}

/* --- Reduced-motion backstop ---
   js/core.js + each section's CSS already gate animation behind
   html.reduced-motion (set synchronously from matchMedia before first
   paint). This is a belt-and-suspenders catch-all for anything that
   slips through (third-party embeds, a future section that forgets the
   guard): it does not by itself un-hide JS-revealed content, which is
   what the html.no-js rules above and the html.reduced-motion rules
   throughout css/sections/*.css handle. */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* --- Screen-reader only --- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}