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

* {
  margin: 0;
}

html,
body {
  min-height: 100%;
}

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

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

:root {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-alt: #eef2f7;
  --color-text: #111827;
  --color-muted: #4b5563;
  --color-accent: #0f766e;
  --color-accent-strong: #115e59;
  --color-border: #d1d5db;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;

  --radius: 0.5rem;
  --container: 72rem;

  --font-body: "IBM Plex Sans", "Segoe UI", Tahoma, sans-serif;
  --font-heading: "Source Serif 4", "Georgia", serif;
}

body {
  background: radial-gradient(circle at top right, #e2e8f0, var(--color-bg) 30%);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.6;
}

a {
  color: inherit;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.15em;
}

a:hover,
a:focus-visible {
  color: var(--color-accent-strong);
}

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -999px;
  background: var(--color-text);
  color: #fff;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius);
}

.skip-link:focus {
  top: var(--space-2);
}

.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-4) 0;
}

.brand {
  font-family: var(--font-heading);
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
  font-weight: 700;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  list-style: none;
  padding: 0;
}

.hero {
  padding: var(--space-7) 0 var(--space-6);
}

h1,
h2 {
  font-family: var(--font-heading);
  line-height: 1.2;
}

h1 {
  max-width: 22ch;
  font-size: clamp(1.9rem, 6vw, 3rem);
}

.hero-subheadline {
  margin-top: var(--space-4);
  max-width: 60ch;
  color: var(--color-muted);
}

.button {
  display: inline-block;
  margin-top: var(--space-5);
  padding: 0.7rem 1.1rem;
  border-radius: var(--radius);
  background: var(--color-accent);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
}

.button:hover,
.button:focus-visible {
  background: var(--color-accent-strong);
  color: #fff;
}

.section {
  padding: var(--space-6) 0;
}

.section-alt {
  background: var(--color-surface-alt);
}

.section p {
  margin-top: var(--space-3);
  max-width: 65ch;
}

.feature-list {
  margin-top: var(--space-4);
  padding-left: 1.25rem;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5) 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  gap: var(--space-4);
  padding: 0;
}

@media (min-width: 48rem) {
  .hero {
    padding: calc(var(--space-7) + 1rem) 0 var(--space-7);
  }

  .footer-inner {
    align-items: center;
    flex-direction: row;
    justify-content: space-between;
  }
}