/* ==========================================================================
   FIT BY SCIENCE - BASE
   ========================================================================== */

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg-primary);
  color: var(--text-on-dark);
  font-family: var(--font-body);
  font-size: var(--text-body-md);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: var(--lh-display);
  margin: 0;
  text-wrap: balance;
}

p { margin: 0; }

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: var(--font-body);
  cursor: pointer;
}

/* ---- Focus states - visible, never suppressed ---- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--science-blue);
  outline-offset: 3px;
}

/* ---- Layout utilities ---- */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

@media (max-width: 640px) {
  .container {
    padding-inline: var(--container-pad-mobile);
  }
}

.container--wide { max-width: var(--container-wide); }
.container--text { max-width: var(--container-text); }

.section {
  padding-block: var(--section-padding-y-mobile);
}

@media (min-width: 1024px) {
  .section { padding-block: var(--section-padding-y); }
}

/* ---- Eyebrow label ---- */
.label {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--stone);
}

/* ---- 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;
}

/* ---- Skip link ---- */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-3);
  background: var(--bone);
  color: var(--obsidian);
  padding: var(--space-2) var(--space-3);
  z-index: 200;
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: top var(--duration-fast) var(--ease-standard);
}

.skip-link:focus {
  top: var(--space-3);
}

/* Anchor targets: offset for the fixed nav so jumped-to sections aren't
   hidden beneath it. No visual/layout change - scroll position only. */
#method,
#results,
#about,
#coaching {
  scroll-margin-top: 6rem;
}

/* ---- Reveal-on-scroll (progressive enhancement) ---- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--duration-slow) var(--ease-standard),
              transform var(--duration-slow) var(--ease-standard);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.js-disabled .reveal,
.no-js .reveal {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}


/* In-page navigation: keep anchored section headings clear of the sticky nav. */
section[id] { scroll-margin-top: 92px; }
@media (max-width: 700px) {
  section[id] { scroll-margin-top: 74px; }
}