/* ==========================================================================
   Dholera — Base: reset, typography, layout primitives
   ========================================================================== */

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

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  background: var(--c-bg);
  color: var(--c-ink);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: var(--lh-body);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img, picture, svg, video { display: block; max-width: 100%; height: auto; }

input, button, textarea, select { font: inherit; color: inherit; }

button { cursor: pointer; background: none; border: none; }

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

ul, ol { list-style: none; padding: 0; }

:focus-visible {
  outline: 2px solid var(--c-brand);
  outline-offset: 3px;
  border-radius: var(--r-sm);
}

.on-dark :focus-visible { outline-color: var(--c-accent); }

::selection { background: var(--c-accent-soft); color: var(--c-ink); }

/* ---- Headings ------------------------------------------------------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: var(--lh-tight);
  letter-spacing: -0.01em;
  color: var(--c-brand-deep);
  text-wrap: balance;
}

h1 { font-size: var(--step-5); }
h2 { font-size: var(--step-4); }
h3 { font-size: var(--step-2); line-height: var(--lh-snug); }
h4 { font-size: var(--step-1); line-height: var(--lh-snug); }

p { text-wrap: pretty; }
p + p { margin-top: 1em; }

strong { font-weight: 600; }

/* ---- Reusable type utilities ------------------------------------- */
.eyebrow {
  font-family: var(--font-body);
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: var(--tracking-caps);
  text-transform: uppercase;
  color: var(--c-accent-strong);
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
}
.eyebrow::before {
  content: "";
  width: 1.8rem;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
}
.on-dark .eyebrow { color: var(--c-accent); }

.lede {
  font-size: var(--step-1);
  line-height: 1.55;
  color: var(--c-ink-soft);
  font-weight: 400;
}

.display-xl {
  font-family: var(--font-display);
  font-size: var(--step-6);
  line-height: 0.98;
  letter-spacing: -0.02em;
}

.serif-num {
  font-family: var(--font-display);
  font-variant-numeric: lining-nums;
  letter-spacing: -0.02em;
}

.muted { color: var(--c-ink-soft); }
.center { text-align: center; }
.nowrap { white-space: nowrap; }

/* Inline icon default (references assets/icons/sprite.svg) */
.ico { width: 1.25em; height: 1.25em; flex-shrink: 0; }

/* ---- Layout primitives ------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--w-wide);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--mid { max-width: var(--w-mid); }
.container--text { max-width: var(--w-text); }

.section { padding-block: var(--section-y); }
.section--tight { padding-block: calc(var(--section-y) * 0.6); }
.section--alt { background: var(--c-bg-alt); }
.section--sink { background: var(--c-bg-sink); }

.section-head {
  max-width: 46rem;
  margin-bottom: clamp(2rem, 1rem + 4vw, 4rem);
}
.section-head--center { margin-inline: auto; text-align: center; }
.section-head .eyebrow { margin-bottom: 1.1rem; }
.section-head p { margin-top: 1.1rem; }

.stack > * + * { margin-top: var(--flow, 1.25rem); }

.grid { display: grid; gap: var(--gap, clamp(1.25rem, 0.5rem + 3vw, 2.5rem)); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 900px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

/* On-dark section colours */
.on-dark {
  background: var(--c-brand-deep);
  color: var(--c-ondark-ink);
}
.on-dark h1, .on-dark h2, .on-dark h3, .on-dark h4 { color: var(--c-ondark-ink); }
.on-dark .lede, .on-dark .muted { color: var(--c-ondark-ink-soft); }

/* ---- Accessibility helpers ------------------------------------- */
.visually-hidden {
  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 {
  position: absolute;
  left: 1rem; top: -100%;
  z-index: 200;
  background: var(--c-brand-deep);
  color: var(--c-ondark-ink);
  padding: 0.75rem 1.25rem;
  border-radius: var(--r-sm);
  transition: top var(--dur-fast) var(--ease);
}
.skip-link:focus { top: 1rem; }

/* ---- Scroll reveal (progressive enhancement) -------------------
   Only hidden when JS is running (html.js). Without JS, or with
   reduced-motion, all content is visible immediately.            */
@media (prefers-reduced-motion: no-preference) {
  .js [data-reveal] {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  }
  .js [data-reveal].is-visible {
    opacity: 1;
    transform: none;
  }
  .js [data-reveal-delay="1"] { transition-delay: 0.08s; }
  .js [data-reveal-delay="2"] { transition-delay: 0.16s; }
  .js [data-reveal-delay="3"] { transition-delay: 0.24s; }
}