:root {
  --bg: #ffffff;
  --bg-alt: #f5f7fa;
  --text: #111827;
  --muted: #4b5563;
  --accent: #0b57b0;
  --accent-dark: #083f82;
  --border: #d5dbe3;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --header-height: 4rem;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-block-start: var(--header-height);
}

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  text-align: start;
}

h1, h2, h3 {
  font-weight: 700;
  line-height: 1.2;
  margin-block: 0 0.75rem;
}

h1 { font-size: clamp(2rem, 6vw, 3.25rem); }
h2 { font-size: clamp(1.5rem, 4vw, 2.125rem); margin-block-end: 1.5rem; }
h3 { font-size: 1.25rem; }

p { margin-block: 0 1rem; }

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

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

[hidden] { display: none !important; }

.container {
  max-inline-size: 70rem;
  margin-inline: auto;
  padding-inline: 1rem;
}

.container.narrow { max-inline-size: 42rem; }

.skip-link {
  position: absolute;
  inset-inline-start: 1rem;
  inset-block-start: -4rem;
  background: var(--text);
  color: #fff;
  padding: 0.75rem 1rem;
  z-index: 20;
}
.skip-link:focus { inset-block-start: 0.5rem; color: #fff; }

/* Header */
.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: 10;
  background: var(--bg);
  border-block-end: 1px solid var(--border);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  min-block-size: var(--header-height);
  gap: 0.5rem;
}

.brand {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
  text-decoration: none;
  min-block-size: 44px;
  display: inline-flex;
  align-items: center;
}
.brand:hover { color: var(--accent); }

.menu-button {
  display: none;
  min-block-size: 44px;
  min-inline-size: 44px;
  padding-inline: 1rem;
  font: inherit;
  font-weight: 700;
  color: var(--text);
  background: var(--bg);
  border: 2px solid var(--text);
  border-radius: 0.375rem;
  cursor: pointer;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 0.25rem;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  min-block-size: 44px;
  padding-inline: 0.75rem;
  color: var(--text);
  font-weight: 600;
  text-decoration: none;
}
.site-nav a:hover { color: var(--accent); text-decoration: underline; }

/* Collapse the nav on small screens only when JavaScript can open it. */
@media (max-width: 40rem) {
  .js .menu-button { display: inline-flex; align-items: center; }
  .js .site-nav { display: none; inline-size: 100%; padding-block-end: 0.75rem; }
  .js .site-nav.is-open { display: block; }
  .js .site-nav ul { flex-direction: column; }
  .js .site-nav a { inline-size: 100%; padding-inline: 0; }
}

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-block-size: 48px;
  padding-inline: 1.75rem;
  font: inherit;
  font-weight: 700;
  color: #fff;
  background: var(--accent);
  border: 2px solid var(--accent);
  border-radius: 0.375rem;
  text-decoration: none;
  cursor: pointer;
}
.button:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; }

/* Hero */
.hero {
  padding-block: 4rem 4.5rem;
}
.hero h1 { max-inline-size: 22ch; }
.lead {
  font-size: 1.25rem;
  color: var(--muted);
  max-inline-size: 38rem;
  margin-block-end: 2rem;
}

/* Sections */
.section { padding-block: 3.5rem; }
.section-alt { background: var(--bg-alt); }

/* Cards */
.cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-inline-start: 4px solid var(--accent);
  border-radius: 0.375rem;
  padding: 1.5rem;
}
.card p:last-child { margin-block-end: 0; }

.shape {
  display: block;
  inline-size: 1.5rem;
  block-size: 1.5rem;
  background: var(--accent);
  margin-block-end: 1rem;
}
.card:nth-child(2) .shape { border-radius: 50%; }
.card:nth-child(3) .shape {
  background: none;
  border: 4px solid var(--accent);
}

.shot {
  display: block;
  inline-size: 100%;
  block-size: auto;
  border: 1px solid var(--border);
  margin-block-end: 1rem;
}

.card-link { font-weight: 600; }

/* Steps */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.5rem;
  counter-reset: step;
}
.steps li {
  counter-increment: step;
  padding-block-start: 1rem;
  border-block-start: 3px solid var(--accent);
}
.steps li::before {
  content: counter(step);
  display: block;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
  margin-block-end: 0.75rem;
}
.steps p { margin-block-end: 0; }

/* Form */
.form { display: grid; gap: 1.25rem; }
.field { display: grid; gap: 0.375rem; }
label { font-weight: 600; }
.optional { font-weight: 400; color: var(--muted); }

input,
select,
textarea {
  inline-size: 100%;
  min-block-size: 44px;
  padding: 0.625rem 0.75rem;
  font: inherit;
  color: var(--text);
  background: #fff;
  border: 2px solid #5b6472;
  border-radius: 0.375rem;
}
textarea { resize: vertical; }

.form .button { justify-self: start; }
.note { color: var(--muted); margin-block-end: 0; }

/* Footer */
.site-footer {
  border-block-start: 1px solid var(--border);
  padding-block: 1.5rem;
  font-size: 1rem;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
}
.footer-inner p { margin: 0; }
.footer-inner a {
  display: inline-flex;
  align-items: center;
  min-block-size: 44px;
}

/* Wider screens */
@media (min-width: 40rem) {
  .container { padding-inline: 2rem; }
  .hero { padding-block: 6rem 6.5rem; }
  .section { padding-block: 5rem; }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 62rem) {
  #what-i-build .cards { grid-template-columns: repeat(3, 1fr); }
  .steps { grid-template-columns: repeat(4, 1fr); }
}