@import url('./tokens.css');

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  color: var(--text);
  scroll-behavior: smooth;
  scroll-padding-top: 6.5rem;
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  overflow-wrap: anywhere;
}

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

a:not([class]) {
  text-decoration-color: color-mix(in srgb, var(--accent) 45%, transparent);
  text-underline-offset: 0.2em;
}

a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 3px solid var(--signal);
  outline-offset: 3px;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

img {
  display: block;
  max-width: 100%;
}

::selection {
  background: var(--signal);
  color: #10140a;
}

main {
  min-height: calc(100vh - 11rem);
}

.page-shell {
  width: min(var(--page-max), calc(100% - 3rem));
  margin-inline: auto;
}

.page-intro {
  max-width: var(--reading-max);
  padding-block: clamp(4rem, 9vw, 8rem);
}

.eyebrow {
  margin: 0 0 var(--space-2);
  color: var(--accent);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

h1 {
  max-width: 18ch;
  margin-bottom: var(--space-2);
  font-size: 4.75rem;
  line-height: 1.08;
  letter-spacing: 0;
}

h2 {
  margin-bottom: var(--space-2);
  font-size: 2.5rem;
  line-height: 1.18;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 0.75rem;
  font-size: 1.35rem;
  line-height: 1.3;
  letter-spacing: 0;
}

.lede {
  max-width: 58ch;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1.125rem;
}

.section-shell {
  width: min(var(--page-max), calc(100% - 3rem));
  margin-inline: auto;
  padding-block: 6rem;
}

.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 0.75fr) minmax(18rem, 1.25fr);
  gap: var(--space-4);
  margin-bottom: var(--space-4);
  align-items: end;
}

.section-heading p {
  max-width: 56ch;
  margin-bottom: 0;
  color: var(--muted);
}

.section-index {
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 800;
}

.button-link,
.text-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: 2.75rem;
  font-weight: 700;
}

.button-link {
  padding: 0.7rem 1rem;
  border: 1px solid var(--text);
  border-radius: var(--radius);
  background: var(--text);
  color: var(--bg);
}

.button-link--secondary {
  border-color: var(--line);
  background: var(--surface);
  color: var(--text);
}

.button-link:hover,
.button-link:focus-visible {
  transform: translateY(-2px);
}

.text-link::after {
  content: '\2192';
  font-size: 1.15em;
}

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

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: var(--radius);
  background: var(--signal);
  color: #10140a;
  transform: translateY(-180%);
}

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

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

@media (max-width: 640px) {
  .page-shell {
    width: min(var(--page-max), calc(100% - 2rem));
  }

  h1 {
    font-size: 2.75rem;
  }

  h2 {
    font-size: 2rem;
  }

  .section-shell {
    width: min(var(--page-max), calc(100% - 2rem));
    padding-block: 4.5rem;
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }
}

@media (min-width: 641px) and (max-width: 980px) {
  h1 {
    font-size: 3.65rem;
  }
}

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

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