/* ============================================================
   BASE — reset, typography scale, layout primitives
   ============================================================ */

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-body);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  letter-spacing: var(--ls-body);
  font-weight: var(--fw-regular);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

::selection {
  background: var(--steel-300);
  color: var(--navy-900);
}

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

/* ---------- Type scale ---------- */
h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  color: var(--text-strong);
  font-weight: var(--fw-medium);
}

p {
  margin: 0;
}

.display {
  font-size: var(--fs-display);
  line-height: var(--lh-display);
  letter-spacing: var(--ls-display);
  font-weight: var(--fw-medium);
  color: var(--text-strong);
}

.heading-lg {
  font-size: var(--fs-heading-lg);
  line-height: var(--lh-heading-lg);
  letter-spacing: var(--ls-heading-lg);
  font-weight: var(--fw-medium);
  color: var(--text-strong);
}

.heading {
  font-size: var(--fs-heading);
  line-height: var(--lh-heading);
  letter-spacing: var(--ls-heading);
  font-weight: var(--fw-medium);
  color: var(--text-strong);
}

.heading-sm {
  font-size: var(--fs-heading-sm);
  line-height: var(--lh-heading-sm);
  letter-spacing: var(--ls-heading-sm);
  font-weight: var(--fw-medium);
  color: var(--text-strong);
}

.subheading {
  font-size: var(--fs-subheading);
  line-height: var(--lh-subheading);
  letter-spacing: var(--ls-subheading);
  font-weight: var(--fw-regular);
}

.subheading-sm {
  font-size: var(--fs-subheading-sm);
  line-height: var(--lh-subheading-sm);
  letter-spacing: var(--ls-subheading-sm);
  font-weight: var(--fw-medium);
}

.body {
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  letter-spacing: var(--ls-body);
}

.body-sm {
  font-size: var(--fs-body-sm);
  line-height: var(--lh-body-sm);
  letter-spacing: var(--ls-body-sm);
}

.caption {
  font-size: var(--fs-caption);
  line-height: var(--lh-caption);
  letter-spacing: var(--ls-caption);
  font-weight: var(--fw-medium);
  text-transform: uppercase;
}

.text-muted {
  color: var(--text-muted);
}

.text-strong {
  color: var(--text-strong);
}

.text-accent {
  color: var(--accent);
}

.text-balance {
  text-wrap: balance;
}

.text-pretty {
  text-wrap: pretty;
}

.text-highlight {
  color: var(--steel-600);
}

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

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

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

.section-lg {
  padding-block: var(--space-12);
}

/* Rhythm is not monotone: bands and compact strips break the 96px cadence */
.section-band {
  padding-block: var(--section-gap-band);
}

.section-compact {
  padding-block: var(--section-gap-compact);
}

.section-inverse {
  background: var(--bg-inverse);
  color: var(--text-inverse-mu);
}

.section-inverse h1,
.section-inverse h2,
.section-inverse h3,
.section-inverse .display,
.section-inverse .heading-lg,
.section-inverse .heading,
.section-inverse .heading-sm {
  color: var(--text-inverse);
}

.section-inverse .text-muted {
  color: var(--text-inverse-mu);
}

.section-tint {
  background: var(--bg-tint);
}

.stack {
  display: flex;
  flex-direction: column;
}

.stack-1 {
  gap: var(--space-1);
}

.stack-2 {
  gap: var(--space-2);
}

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

.stack-4 {
  gap: var(--space-4);
}

.stack-5 {
  gap: var(--space-5);
}

.stack-6 {
  gap: var(--space-6);
}

.row {
  display: flex;
  align-items: center;
  gap: var(--element-gap);
}

.row-wrap {
  flex-wrap: wrap;
}

.center {
  text-align: center;
}

.items-center {
  align-items: center;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

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

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.measure {
  max-width: 42ch;
}

.measure-lg {
  max-width: 60ch;
}

/* Measured caps: text never fills the 1216px column */
.measure-display {
  max-width: var(--measure-display);
}

.measure-lead {
  max-width: var(--measure-lead);
}

.measure-heading {
  max-width: var(--measure-heading);
}

.mx-auto {
  margin-inline: auto;
}

.divider {
  height: 1px;
  background: var(--border);
  border: 0;
  margin: 0;
}

.divider-gradient {
  height: 1px;
  border: 0;
  margin: 0;
  background: linear-gradient(90deg, transparent, var(--steel-300), transparent);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  :root {
    --fs-display: 4rem;
    --ls-display: -3.2px;
    --fs-heading-lg: 2.75rem;
    --ls-heading-lg: -1.76px;
    --section-gap: 72px;
    --section-gap-band: 40px;
    --section-gap-compact: 28px;
  }

  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  :root {
    --fs-display: 2.5rem;
    --ls-display: -1.6px;
    --fs-heading-lg: 2rem;
    --ls-heading-lg: -1.28px;
    --fs-heading: 1.75rem;
    --ls-heading: -0.98px;
    --fs-heading-sm: 1.5rem;
    --ls-heading-sm: -0.84px;
    --fs-subheading: 1.0625rem;
    --ls-subheading: -0.17px;
    --section-gap: 56px;
    --section-gap-band: 32px;
    --section-gap-compact: 24px;
    --gutter: 20px;
  }

  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}