/* =====================================================================
   Volta Ad — Base / Reset / Global Styles
   ===================================================================== */

/* ── Font Face declarations ─────────────────────────────────────────── */
/* Space Grotesk — display/headings */
@font-face {
  font-family: 'Space Grotesk';
  src: url('/assets/fonts/space-grotesk/SpaceGrotesk-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Space Grotesk';
  src: url('/assets/fonts/space-grotesk/SpaceGrotesk-Medium.woff2') format('woff2');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Space Grotesk';
  src: url('/assets/fonts/space-grotesk/SpaceGrotesk-Bold.woff2') format('woff2');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}
/* Inter — body/UI */
@font-face {
  font-family: 'Inter';
  src: url('/assets/fonts/inter/Inter-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('/assets/fonts/inter/Inter-Medium.woff2') format('woff2');
  font-weight: 500;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: 'Inter';
  src: url('/assets/fonts/inter/Inter-SemiBold.woff2') format('woff2');
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--color-text-primary-dark);
  background-color: var(--color-bg-deep);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

p, h1, h2, h3, h4, h5, h6 {
  overflow-wrap: break-word;
}

/* ── Typography ─────────────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: var(--font-bold);
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-snug);
  color: var(--color-text-primary-dark);
}

h1 { font-size: clamp(2.25rem, 6vw, 5rem); letter-spacing: var(--tracking-tight); line-height: var(--leading-tight); }
h2 { font-size: clamp(1.75rem, 4vw, 3rem); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

p { max-width: 70ch; }

a {
  color: var(--color-accent);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

/* ── Focus styles ───────────────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Light surface focus */
.surface-light :focus-visible,
.section--light :focus-visible {
  outline-color: var(--color-focus-ring-light);
}

/* ── Skip link ──────────────────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 9999;
  padding: var(--space-3) var(--space-5);
  background: var(--color-accent);
  color: var(--color-accent-text);
  font-weight: var(--font-medium);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: var(--space-4);
}

/* ── Container ──────────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

@media (min-width: 1280px) {
  .container { padding: 0 var(--space-8); }
}

/* ── Section backgrounds ────────────────────────────────────────────── */
.section--dark-deep    { background: var(--color-bg-deep); color: var(--color-text-primary-dark); }
.section--dark-section { background: var(--color-bg-section); color: var(--color-text-primary-dark); }
.section--mid          { background: var(--color-surface-mid); color: var(--color-text-primary-light); }
.section--light        { background: var(--color-surface-light); color: var(--color-text-primary-light); }

/* On light backgrounds, secondary text flips to the dark-text value. */
.section--mid, .section--light { --color-text-secondary: var(--color-text-secondary-light); }

/* Default vertical rhythm for background sections (the section--* modifiers are
   often used without the base .section class — keep blocks from collapsing). */
.section--dark-deep, .section--dark-section, .section--mid, .section--light { padding: var(--space-16) 0; }
@media (min-width: 768px)  { .section--dark-deep, .section--dark-section, .section--mid, .section--light { padding: var(--space-20) 0; } }
@media (min-width: 1100px) { .section--dark-deep, .section--dark-section, .section--mid, .section--light { padding: var(--space-24) 0; } }

.section--mid h1,.section--mid h2,.section--mid h3,.section--mid h4,
.section--light h1,.section--light h2,.section--light h3,.section--light h4 {
  color: var(--color-text-primary-light);
}

/* ── Mobile safety: stack inline two-column grids ───────────────────────
   Many sections use an inline `style="grid-template-columns:1fr 1fr"` (etc.)
   with no breakpoint, which stays 2-up and overflows on phones. Below the
   desktop breakpoint, collapse fixed-column inline grids to a single column.
   (auto-fit / minmax grids already reflow, so they're excluded.) */
@media (max-width: 899px) {
  [style*="grid-template-columns"]:not([style*="minmax"]):not([style*="auto-fit"]):not([style*="auto-fill"]) {
    grid-template-columns: 1fr !important;
    gap: var(--space-8) !important;
  }
}

/* ── Section padding ────────────────────────────────────────────────── */
.section {
  padding: var(--space-16) 0;
}
@media (min-width: 768px) {
  .section { padding: var(--space-20) 0; }
}
@media (min-width: 1024px) {
  .section { padding: var(--space-24) 0; }
}

.section--hero {
  padding: var(--space-20) 0;
}
@media (min-width: 768px) {
  .section--hero { padding: var(--space-24) 0; }
}
@media (min-width: 1024px) {
  .section--hero { padding: var(--space-32) 0; }
}

.section--compact {
  padding: var(--space-8) 0;
}
@media (min-width: 768px) {
  .section--compact { padding: var(--space-10) 0; }
}
@media (min-width: 1024px) {
  .section--compact { padding: var(--space-12) 0; }
}

/* ── Overline label ─────────────────────────────────────────────────── */
.overline {
  display: inline-block;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.section--light .overline,
.section--mid .overline {
  color: var(--color-text-secondary-light);
}

/* ── Lists ──────────────────────────────────────────────────────────── */
ul, ol { padding-left: var(--space-6); }
li { margin-bottom: var(--space-2); }

/* ── Prose (long-form body) ─────────────────────────────────────────── */
.prose p { margin-bottom: var(--space-4); line-height: var(--leading-relaxed); }
.prose h2 { margin-top: var(--space-10); margin-bottom: var(--space-4); }
.prose h3 { margin-top: var(--space-8); margin-bottom: var(--space-3); }
.prose ul, .prose ol { margin-bottom: var(--space-4); }
.prose a { color: var(--color-accent); text-decoration: underline; }
.prose strong { font-weight: var(--font-semibold); }

/* ── Utility ────────────────────────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.text-accent { color: var(--color-accent); }
.text-secondary { color: var(--color-text-secondary-dark); }
.text-center { text-align: center; }

.section__header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--space-12);
}

.section__subhead {
  font-size: var(--text-md);
  line-height: var(--leading-normal);
  color: var(--color-text-secondary-dark);
  margin-top: var(--space-4);
  max-width: 65ch;
  margin-left: auto;
  margin-right: auto;
}

.section--light .section__subhead,
.section--mid .section__subhead {
  color: var(--color-text-secondary-light);
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 400ms cubic-bezier(0.16, 1, 0.3, 1),
              transform 400ms cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}