/* ============================================================
   PIXELBIN CASE STUDY — BASE STYLES
   Design language: Settle Club sibling
   Typeface: Helvetica Now Display (portfolio-wide)
   Palette: frost/charcoal (portfolio-wide)
   ============================================================ */

@font-face {
  font-family: 'Helvetica Now Display';
  src: url('/fonts/HelveticaNowDisplay-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Helvetica Now Display';
  src: url('/fonts/HelveticaNowDisplay-Medium.woff2') format('woff2');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'Helvetica Now Display';
  src: url('/fonts/HelveticaNowDisplay-Bold.woff2') format('woff2');
  font-weight: 800;
  font-style: normal;
  font-display: swap;
}

:root {
  --frost: #f6f6eb;
  --charcoal: #343434;
  --text-primary: #343434;
  --text-secondary: #5a5a56;
  --text-muted: #636360;
  --text-ghost: #767672;
  --margin: 1.2em;
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: auto;
}

body {
  font-size: clamp(0.875rem, 1.111vw, 1.125rem);
  font-family: 'Helvetica Now Display', Helvetica, Arial, sans-serif;
  background: var(--frost);
  color: var(--charcoal);
  line-height: 1.5;
  min-height: 100vh;
  overscroll-behavior: none;
}

.overflow-clip {
  overflow-x: clip;
}

@supports not (overflow-x: clip) {
  .overflow-clip {
    overflow-x: hidden;
  }
}

::selection { color: var(--charcoal); background: #c8ff00; }

img {
  display: block;
  max-width: 100%;
  height: auto;
  will-change: transform;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
}

a {
  color: var(--charcoal);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity 0.2s ease;
}

a:hover { opacity: 0.6; }

/* ── ACCESSIBILITY ── */

.skip-link {
  position: absolute;
  top: -100%;
  left: 1em;
  padding: 0.8em 1.6em;
  background: var(--charcoal);
  color: var(--frost);
  font-family: 'Helvetica Now Display', sans-serif;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  border-radius: 0 0 4px 4px;
  z-index: 9999;
}

.skip-link:focus { top: 0; }

*:focus-visible {
  outline: 2px solid var(--charcoal);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .k-a { opacity: 1 !important; }
}

/* ── TYPOGRAPHY ── */

.heading2 {
  font-family: 'Helvetica Now Display', sans-serif;
  font-size: clamp(2rem, 5vw, 4.5rem);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--charcoal);
}

.heading4 {
  font-family: 'Helvetica Now Display', sans-serif;
  font-size: 2em;
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  color: var(--charcoal);
}

.caps-subheading {
  font-family: 'Helvetica Now Display', sans-serif;
  font-size: 0.8em;
  font-weight: 800;
  line-height: 1em;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--charcoal);
}

.mono-text {
  font-family: 'Helvetica Now Display', sans-serif;
  font-size: 0.7em;
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.body-copy {
  font-family: 'Helvetica Now Display', sans-serif;
  font-size: 0.875em;
  font-weight: 400;
  line-height: 1.55;
  color: var(--text-secondary);
}

.body-copy + .body-copy { margin-top: 1.2em; }

/* ── LAYOUT ── */

.content-section {
  background: var(--frost);
  color: var(--charcoal);
  padding: 8em 8% 6em;
}

.content-row {
  display: flex;
  justify-content: center;
  gap: 4em;
  max-width: 72em;
  margin: 0 auto;
}

.content-left {
  width: 25%;
  flex-shrink: 0;
}

.content-right {
  width: 45%;
  flex-shrink: 0;
}

/* ── FULL-SCREEN IMAGE ASSET ── */

.full-screen-asset {
  position: relative;
  width: 100%;
  min-height: 70vh;
  overflow: hidden;
  isolation: isolate;
}

.full-screen-asset img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.full-screen-asset .overlay-text {
  position: absolute;
  z-index: 10;
  max-width: 24em;
}

.full-screen-asset .overlay-text--bottom-left {
  bottom: 2.4em;
  left: 2.4em;
}

.full-screen-asset .overlay-text--top-left {
  top: 2.4em;
  left: 2.4em;
}

/* ── HALF-IMAGE SPLIT ── */

.split-asset {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  width: 100%;
}

.split-asset__panel {
  position: relative;
  overflow: hidden;
  min-height: 60vh;
}

.split-asset__panel img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.split-asset__label {
  position: absolute;
  z-index: 10;
  padding: 2em;
}

.split-asset__label--top { top: 0; left: 0; }
.split-asset__label--bottom { bottom: 0; left: 0; }

/* ── DIVIDER ── */

.divider {
  width: 100%;
  height: 1px;
  background: var(--charcoal);
  opacity: 0.06;
}

/* ── EVIDENCE REVEAL ── */

.k-a {
  opacity: 0;
  transition: opacity 600ms ease;
}

.k-a.is-visible { opacity: 1; }

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


/* ── RESPONSIVE ── */

@media (max-width: 768px) {
  .content-section { padding: 5em 6% 4em; }
  .content-row { flex-direction: column; gap: 2em; }
  .content-left, .content-right { width: 100%; }
  .split-asset { grid-template-columns: 1fr; }
  .split-asset__panel { min-height: 50vh; }
  .full-screen-asset { min-height: 50vh; }
  .chapter-indicator { padding: 14px 20px; }
}