:root {
  --bg: #ffffff;
  --bg-alt: #f6f7fb;
  --text: #10131a;
  --muted: #56607a;
  --accent: #4f46e5;
  --accent-contrast: #ffffff;
  --border: #e3e6ef;
  --code-bg: #0f1420;
  --code-text: #e6e9f2;
  --glow: rgba(79, 70, 229, 0.1);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0e17;
    --bg-alt: #111524;
    --text: #eef0f7;
    --muted: #9aa3bd;
    --accent: #8b85ff;
    --accent-contrast: #0b0e17;
    --border: #232840;
    --code-bg: #151b2f;
    --code-text: #e6e9f2;
    --glow: rgba(139, 133, 255, 0.14);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font: 1rem/1.6 var(--font);
  background: var(--bg);
  color: var(--text);
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

.skip {
  position: absolute;
  left: -999px;
}

.skip:focus {
  left: 8px;
  top: 8px;
  padding: 8px 12px;
  background: var(--bg);
  z-index: 20;
}

/* header / footer */
.site-header {
  border-bottom: 1px solid var(--border);
}

.bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  padding-top: 12px;
  padding-bottom: 12px;
}

.brand {
  color: var(--text);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.brand .ver {
  margin-left: 8px;
  padding: 2px 6px;
  font: 0.7rem var(--mono);
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  vertical-align: middle;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

nav a {
  padding: 6px 10px;
  color: var(--muted);
  text-decoration: none;
  border-radius: 6px;
}

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

nav a[aria-current="page"] {
  color: var(--text);
  background: var(--bg-alt);
  font-weight: 600;
}

.site-footer {
  margin-top: 48px;
  padding: 24px 0;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer p {
  margin: 0 0 4px;
}

/* hero and page heads */
.hero {
  padding: 72px 0 56px;
  background: radial-gradient(ellipse at 50% 0%, var(--glow), transparent 70%);
}

.page-head {
  padding: 48px 0 8px;
}

.eyebrow {
  margin: 0 0 12px;
  font: 600 0.8rem var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}

h1 {
  margin: 0 0 20px;
  max-width: 22ch;
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.page-head h1 {
  max-width: 28ch;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
}

.lead {
  max-width: 62ch;
  color: var(--muted);
  font-size: 1.15rem;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.btn {
  display: inline-block;
  padding: 10px 18px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
}

/* sections */
section {
  padding: 40px 0;
}

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

h2 {
  margin: 0 0 16px;
  font-size: 1.5rem;
  line-height: 1.25;
}

h3 {
  margin: 28px 0 10px;
  font-size: 1.1rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.card {
  padding: 20px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.card h3 {
  margin: 0 0 8px;
}

.card p {
  margin: 0;
  color: var(--muted);
}

blockquote {
  margin: 0;
  padding: 20px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
}

blockquote p {
  margin: 0 0 12px;
  font-size: 1.05rem;
}

blockquote footer {
  color: var(--muted);
  font-size: 0.9rem;
}

/* prose */
.prose > p,
.prose > ul,
.prose > h2,
.prose > h3,
.prose > blockquote {
  max-width: 72ch;
}

.prose h2 {
  margin: 40px 0 12px;
}

.prose ul {
  padding-left: 1.25rem;
}

.prose li {
  margin: 0.5em 0;
}

code {
  padding: 0.1em 0.35em;
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
}

pre {
  margin: 0 0 24px;
  padding: 16px 18px;
  overflow-x: auto;
  background: var(--code-bg);
  color: var(--code-text);
  border: 1px solid var(--border);
  border-radius: 10px;
  font: 0.875rem/1.55 var(--mono);
}

pre code {
  padding: 0;
  font: inherit;
  background: none;
  border: 0;
}

/* tables */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
}

table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
}

th,
td {
  padding: 14px 16px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--border);
}

thead th {
  background: var(--bg-alt);
}

tbody th {
  font-weight: 600;
}

tr:last-child > * {
  border-bottom: 0;
}

.plan-price {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 400;
}

/* estimator */
.formula {
  margin: 0 0 24px;
  padding: 16px 18px;
  overflow-x: auto;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  font-family: Georgia, serif;
  font-style: italic;
}

.estimator {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin: 0 0 20px;
}

.field label {
  display: block;
  margin-bottom: 4px;
  font-size: 0.9rem;
  font-weight: 600;
}

.field input {
  width: 100%;
  padding: 10px 12px;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin: 0 0 24px;
}

.results div {
  padding: 16px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.results dt {
  color: var(--muted);
  font-size: 0.85rem;
}

.results dd {
  margin: 4px 0 0;
  font-size: 1.5rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.results dd.small {
  font-size: 1rem;
}