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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  background: var(--bg-0);
  color: var(--fg-0);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  font-feature-settings: "cv11", "ss03";
  letter-spacing: -0.003em;
}

img { max-width: 100%; display: block; }
a { color: var(--fg-0); text-decoration: none; transition: color var(--dur-fast) var(--ease); }
a:hover { color: var(--accent-subtle); }

::selection { background: var(--fg-0); color: var(--bg-0); }

:focus-visible {
  outline: 2px solid var(--fg-0);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--bg-2);
  color: var(--fg-0);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  z-index: 1000;
}
.skip-link:focus { left: 1rem; top: 1rem; }

/* Typography — Inter-based, Apple-style weights and tracking */
h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin: 0;
  color: var(--fg-0);
}

h2 {
  font-size: var(--fs-h1);
  letter-spacing: -0.035em;
  font-weight: 600;
}

p { margin: 0 0 1rem; color: var(--fg-1); }

.mono { font-family: var(--font-mono); font-size: var(--fs-mono); letter-spacing: 0.06em; }
.muted { color: var(--fg-2); }

/* Layout primitives */
.container {
  width: min(100% - (var(--gutter) * 2), var(--max));
  margin-inline: auto;
}

section {
  position: relative;
  min-height: 100vh;
  padding: clamp(5rem, 10vh, 8rem) 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  z-index: 1;
}

/* Section label — minimal, numeric */
.sec-label {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--fg-2);
  text-transform: uppercase;
  letter-spacing: 0.28em;
  margin-bottom: 1.25rem;
  font-weight: 500;
}
.sec-label::before {
  content: "";
  width: 24px;
  height: 1px;
  background: var(--fg-2);
}
.sec-label .num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.72rem;
  color: var(--fg-1);
  letter-spacing: 0.08em;
  text-transform: none;
}

.sec-title {
  font-size: var(--fs-h1);
  margin-bottom: clamp(1.75rem, 4vh, 3rem);
  font-weight: 600;
  letter-spacing: -0.035em;
  color: var(--fg-0);
  max-width: 20ch;
}

.sec-intro {
  color: var(--fg-1);
  max-width: 60ch;
  margin-bottom: 2.5rem;
  font-size: 1.0625rem;
  line-height: 1.65;
}