/* ============================================================
   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 in the DOM on every page) --- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 999;
  background: var(--ink);
  color: var(--white);
  padding: 0.85rem 1.4rem;
  border-radius: var(--radius-card);
  font-family: var(--font-display);
  font-weight: 600;
  text-decoration: none;
  transition: top 200ms var(--ease-out);
}
.skip-link:focus {
  top: 1rem;
}

/* --- 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;
  /* --accent alone is 4.37:1 on --bone, just under the 4.5:1 AA floor for
     this small a label; --accent-strong clears it (8.1:1) without changing
     the brand accent used elsewhere for buttons/borders/icons. */
  color: var(--accent-strong);
}
.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); }

/* Full-width variant: title and intro share one column that spans the whole
   .container (no 46ch / 52ch measure caps), wrapping only at its edge. */
.section-head--full,
.section-head--full p { max-width: none; }

/* --- 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; }

/* --- 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 (data-chapter stamped by core.js) ---
   isolation: the numeral sits at z-index:-1. Without its own stacking
   context the head only has one while [data-reveal] is mid-transform, so
   once the reveal settles (transform: none) the numeral drops behind the
   section's background and vanishes. Isolating keeps it behind the head's
   text but above the section, for as long as the head is on screen. */
.section-head { position: relative; }
.section-head[data-chapter] { isolation: isolate; }
.section-head[data-chapter]::before {
  content: attr(data-chapter);
  position: absolute;
  top: -0.55em;
  left: -0.06em;
  z-index: -1;
  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 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; }

/* JS only creates .chapter-spine when the viewport is >=1200px at load time,
   but never re-checks on resize -- this media query is the real gate so the
   rail never sits on top of narrower body copy after the window is shrunk.
   1200px is NOT the safe cutoff: .container's width formula is
   min(1200px, 100% - 2.5rem), so its left margin stays flat at 20px for
   ANY viewport under ~1240px, then grows as (viewport - 1200px) / 2 above
   that. The spine's own right edge sits at a fixed ~36px from the viewport
   edge, so overlap actually persists up to ~1272px (where the container
   margin first reaches 36px) and isn't comfortably clear until well past
   that. Measured directly (Playwright, chapter-spine right edge vs
   .container left edge): 1200-1250px overlap, 1280-1300px barely clears
   with only 4-14px gap, 1350px+ is comfortable. Gate at 1400px for a real
   safety margin instead of the theoretical 1200px crossover. */
@media (max-width: 1399.98px) {
  .chapter-spine { display: none; }
}

/* --- Cursor-reactive glow (injected by core.js on section.on-ink) ---
   .cursor-glow-layer is the clipping box so the glow can never paint outside
   its section. z-index 0 keeps it under section content and wave dividers
   (which sit at z-index 1). The `section >` prefix outranks `.grain > *`,
   which would otherwise lift the layer to z-index 1 over the dividers. */
section > .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;
}

/* --- Back to top (injected by core.js on every page) ---
   Accent fill reads on both bone and ink sections. z-index 170 keeps it
   under the mobile quick-action bar (180) and the nav overlay (199/210). */
.back-to-top {
  position: fixed;
  right: clamp(1rem, 2vw, 1.5rem);
  bottom: clamp(1rem, 2vw, 1.5rem);
  z-index: 170;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  padding: 0;
  border: 0;
  border-radius: var(--radius-pill);
  background: var(--accent);
  color: var(--accent-on);
  box-shadow: 0 8px 24px var(--accent-glow), inset 0 0 0 1px hsl(0 0% 100% / 0.18);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity 300ms var(--ease-out), transform 300ms var(--ease-out),
    visibility 0s linear 300ms, background-color 200ms var(--ease-out);
}
.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
  transition: opacity 300ms var(--ease-out), transform 300ms var(--ease-out),
    visibility 0s, background-color 200ms var(--ease-out);
}
.back-to-top:hover { background: var(--accent-strong); }
/* Mobile: lift clear of the fixed "Call | Book Now" bar (56px + safe area) */
@media (max-width: 820px) {
  .back-to-top {
    right: 1rem;
    bottom: calc(56px + env(safe-area-inset-bottom) + 0.85rem);
    width: 2.75rem;
    height: 2.75rem;
  }
}

/* --- Reduced-motion backstop: js/core.js + section JS already put every
   animated element into its final state via html.reduced-motion (see
   [data-reveal], .marquee__track, .pulse-line--draw above); this is the
   belt-and-suspenders CSS-level stop for anything that slips through. --- */
@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;
}