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

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-fg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

main {
  flex: 1;
}

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 5rem); }
h2 { font-size: clamp(2rem, 4vw, 3.5rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2.5rem); }
h4 { font-size: clamp(1.25rem, 2vw, 1.75rem); }

p {
  max-width: 65ch;
  margin-bottom: var(--spacing-4);
}

a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 4px;
  transition: color var(--transition-fast), text-decoration-color var(--transition-fast);
}

a:hover {
  color: var(--color-accent);
  text-decoration-color: var(--color-accent);
}

code, kbd, samp, pre {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

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

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

table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

th, td {
  padding: var(--spacing-3) var(--spacing-4);
  border-bottom: var(--border-thin);
}

th {
  font-weight: bold;
  background-color: var(--color-surface);
}

/* Base layouts */
.container {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--spacing-4);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--spacing-8);
  }
}

.grid-asymmetric {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-8);
}

@media (min-width: 768px) {
  .grid-asymmetric {
    grid-template-columns: 3fr 2fr;
  }
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-6);
}
@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-6);
}
@media (min-width: 768px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.surface {
  background-color: var(--color-surface);
  border: var(--border-thin);
  padding: var(--spacing-6);
}

.btn {
  display: inline-block;
  background-color: var(--color-accent);
  color: var(--color-bg);
  padding: var(--spacing-3) var(--spacing-6);
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  text-decoration: none;
  border: 2px solid transparent;
  transition: background-color var(--transition-fast);
}

.btn:hover {
  background-color: var(--color-bg);
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-fg);
  border-color: var(--color-border);
}
.btn-secondary:hover {
  border-color: var(--color-fg);
  color: var(--color-fg);
  background-color: transparent;
}

header {
  border-bottom: var(--border-thin);
  padding: var(--spacing-4) 0;
}
header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-4);
}

nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  gap: var(--spacing-6);
  margin: 0;
}

nav a {
  text-decoration: none;
  font-weight: 500;
}

nav a[aria-current="page"] {
  color: var(--color-accent);
  border-bottom: 2px solid var(--color-accent);
}

footer {
  border-top: var(--border-thin);
  padding: var(--spacing-12) 0;
  margin-top: var(--spacing-24);
  background-color: var(--color-surface);
}

footer .grid-3 {
  gap: var(--spacing-12);
}

footer h4 {
  margin-bottom: var(--spacing-4);
}

footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
footer li {
  margin-bottom: var(--spacing-2);
}

.section-title {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-4);
  margin-bottom: var(--spacing-12);
  border-bottom: var(--border-thin);
  padding-bottom: var(--spacing-4);
}

.section-num {
  font-family: var(--font-mono);
  color: var(--color-accent);
  font-size: 1.5rem;
}

.hero {
  padding: var(--spacing-24) 0 var(--spacing-16);
  border-bottom: var(--border-thin);
}

.tag {
  display: inline-block;
  padding: 0.125rem 0.5rem;
  border: var(--border-thin);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
}