/* ==========================================================================
   OptiRank Studio — Base: reset, typography, layout primitives
   ========================================================================== */

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

/* An element's own `display` rule (e.g. `.contact-form { display: grid }`)
   otherwise beats the UA [hidden] default at equal specificity, so the
   hidden attribute silently fails to hide anything with a display rule of
   its own. This makes [hidden] authoritative everywhere on the site. */
[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + var(--space-2));
}

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-body);
  line-height: 1.6;
  color: var(--color-ink);
  background-color: var(--color-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  text-wrap: balance;
}

h1 { font-size: var(--text-h1); font-weight: 700; }
h2 { font-size: var(--text-h2); }
h3 { font-size: var(--text-h3); }
h4 { font-size: var(--text-body-lg); }

p {
  margin: 0 0 var(--space-2);
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--color-primary);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--color-primary-dim);
}

ul, ol {
  margin: 0 0 var(--space-2);
  padding-left: var(--space-3);
}

li {
  margin-bottom: var(--space-1);
}

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

hr {
  border: 0;
  border-top: 1px solid var(--color-border);
  margin: var(--space-6) 0;
}

strong {
  font-weight: 600;
}

code, kbd, samp, pre {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

/* Focus ------------------------------------------------------------------ */

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Skip link -------------------------------------------------------------- */

.skip-link {
  position: absolute;
  top: 0;
  left: var(--space-2);
  z-index: 999;
  padding: var(--space-1) var(--space-2);
  background: var(--color-primary-solid);
  color: var(--color-on-primary);
  font-size: var(--text-caption);
  font-weight: 600;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  text-decoration: none;
  transform: translateY(-110%);
  transition: transform var(--duration-fast) var(--ease-out);
}

.skip-link:focus {
  transform: translateY(0);
  color: var(--color-on-primary);
}

/* Layout primitives ------------------------------------------------------ */

.container {
  width: 100%;
  max-width: var(--content-max);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-4);
  }
}

.section {
  padding-block: var(--space-8);
}

@media (min-width: 1024px) {
  .section {
    padding-block: var(--space-16);
  }
}

.section--tight {
  padding-block: var(--space-6);
}

@media (min-width: 1024px) {
  .section--tight {
    padding-block: var(--space-12);
  }
}

.section--alt {
  background-color: var(--color-surface-alt);
}

.section__header {
  max-width: 680px;
  margin-bottom: var(--space-6);
}

.section__header--center {
  margin-inline: auto;
  text-align: center;
}

.prose {
  max-width: var(--prose-max);
}

.grid {
  display: grid;
  gap: var(--space-3);
}

@media (min-width: 768px) {
  .grid--2 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(3, 1fr); }
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1024px) {
  .grid { gap: var(--space-4); }
  .grid--4 { grid-template-columns: repeat(4, 1fr); }
}

/* Type helpers ----------------------------------------------------------- */

.eyebrow {
  display: block;
  margin-bottom: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-caption);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.lead {
  font-size: var(--text-body-lg);
  line-height: 1.6;
  color: var(--color-ink-dim);
  text-wrap: pretty;
}

.text-dim {
  color: var(--color-ink-dim);
}

.text-caption {
  font-size: var(--text-caption);
  color: var(--color-ink-dim);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.stack > * + * {
  margin-top: var(--space-2);
}

.stack-lg > * + * {
  margin-top: var(--space-4);
}