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

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--nav-h) + 16px);
}

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

body.is-locked {
  overflow: hidden;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

ul[role="list"],
ol[role="list"] {
  list-style: none;
  padding: 0;
}

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

svg {
  flex-shrink: 0;
}

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

button {
  cursor: pointer;
  background: none;
  border: 0;
  padding: 0;
}

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

::selection {
  background: rgba(184, 201, 181, 0.6);
}

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-radius: 4px;
}

.on-night :focus-visible,
.night :focus-visible {
  outline-color: var(--blue-soft);
}

/* ---- Accessibility helpers ------------------------------------------- */

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

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  padding: 10px 16px;
  border-radius: var(--r-sm);
  background: var(--ink);
  color: var(--paper);
  font-size: var(--fs-small);
  transform: translateY(-150%);
  transition: transform var(--dur-md) var(--ease-emphasized);
}

.skip-link:focus {
  transform: translateY(0);
}

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

.container {
  width: 100%;
  max-width: calc(var(--container) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--wide {
  max-width: calc(var(--container-wide) + var(--gutter) * 2);
}

.container--narrow {
  max-width: calc(var(--container-narrow) + var(--gutter) * 2);
}

.section {
  position: relative;
  padding-block: var(--section-y);
}

.night {
  background: var(--night);
  color: var(--night-text);
}

/* ---- Typography ------------------------------------------------------ */

.display {
  font-size: var(--fs-display);
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-display);
  font-weight: 600;
  text-wrap: balance;
}

.h1 {
  font-size: var(--fs-h1);
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-display);
  font-weight: 600;
  text-wrap: balance;
}

.h2 {
  font-size: var(--fs-h2);
  line-height: var(--lh-heading);
  letter-spacing: var(--tracking-heading);
  font-weight: 600;
  text-wrap: balance;
}

.h3 {
  font-size: var(--fs-h3);
  line-height: var(--lh-snug);
  letter-spacing: var(--tracking-snug);
  font-weight: 550;
}

.lead {
  font-size: var(--fs-lead);
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--graphite);
  text-wrap: pretty;
}

.night .lead,
.on-night .lead {
  color: var(--night-text-2);
}

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

.night .muted {
  color: var(--night-text-2);
}

.mono {
  font-family: var(--font-mono);
  font-feature-settings: "zero" 0;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--mute);
}

.eyebrow::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}

.night .eyebrow {
  color: var(--night-text-3);
}

.grad-text {
  background: var(--brand-grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Section header pattern: eyebrow → heading → lead */
.section-head {
  display: grid;
  gap: var(--s-6);
  max-width: 880px;
}

.section-head--split {
  max-width: none;
  grid-template-columns: 1fr;
  align-items: end;
}

@media (min-width: 1024px) {
  .section-head--split {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    column-gap: var(--s-16);
  }

  .section-head--split .eyebrow {
    grid-column: 1 / -1;
  }
}