/*
 * orthos.design one-page site. Colours, type and spacing match the Orthos app's design tokens:
 * light by default, dark from the OS preference. No web fonts are fetched; Inter is used when installed.
 */

:root {
  color-scheme: light;
  --font-sans: "Inter Variable", "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono Variable", "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --color-canvas: #f6f7f8;
  --color-surface: #ffffff;
  --color-border: #e4e7ea;
  --color-fg: #1a1d20;
  --color-fg-muted: #565e67;
  --color-accent: #2c58c7;
  --color-accent-hover: #2346a1;
  --color-accent-fg: #ffffff;
  --color-accent-text: #2346a1;
  --color-grid: rgb(44 88 199 / 0.07);
  --radius: 0.5rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --width-page: 64rem;
  --width-text: 40rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --color-canvas: #0d0e10;
    --color-surface: #131517;
    --color-border: #2b3035;
    --color-fg: #f6f7f8;
    --color-fg-muted: #9aa2ab;
    --color-accent: #6a8ef2;
    --color-accent-hover: #8eabfa;
    --color-accent-fg: #0d0e10;
    --color-accent-text: #8eabfa;
    --color-grid: rgb(106 142 242 / 0.08);
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-canvas);
  /* A faint drafting grid, as on a plan sheet. */
  background-image:
    linear-gradient(var(--color-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid) 1px, transparent 1px);
  background-size: 1.5rem 1.5rem;
  color: var(--color-fg);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
}

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

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.top,
main,
.foot {
  width: 100%;
  max-width: var(--width-page);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: var(--space-6);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-fg);
  text-decoration: none;
}

.brand-mark {
  width: 2rem;
  height: 2rem;
}

.brand-name {
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.link-quiet {
  font-size: 0.9375rem;
  font-weight: 500;
}

main {
  flex: 1;
}

.hero {
  padding-block: var(--space-16) var(--space-12);
  max-width: 48rem;
}

.eyebrow {
  margin: 0 0 var(--space-4);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--color-fg-muted);
}

h1 {
  margin: 0;
  font-size: clamp(2.25rem, 6vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -0.025em;
  font-weight: 650;
  text-wrap: balance;
}

.lede {
  margin: var(--space-6) 0 0;
  max-width: var(--width-text);
  font-size: 1.1875rem;
  color: var(--color-fg-muted);
}

.actions {
  margin: var(--space-8) 0 0;
}

.button {
  display: inline-block;
  min-height: 2.75rem;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius);
  background: var(--color-accent);
  color: var(--color-accent-fg);
  font-weight: 600;
  text-decoration: none;
}

.button:hover {
  background: var(--color-accent-hover);
}

h2 {
  margin: 0 0 var(--space-6);
  font-size: 1.5rem;
  line-height: 1.25;
  letter-spacing: -0.015em;
  font-weight: 600;
}

h3 {
  margin: 0 0 var(--space-2);
  font-size: 1.0625rem;
  line-height: 1.35;
  font-weight: 600;
}

.features,
.audience,
.closing {
  padding-block: var(--space-12);
  border-top: 1px solid var(--color-border);
}

.grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
}

@media (min-width: 48rem) {
  .grid {
    grid-template-columns: 1fr 1fr;
  }
}

.card {
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
}

.card p,
.audience p,
.closing p {
  margin: 0;
  max-width: var(--width-text);
  color: var(--color-fg-muted);
}

.closing .actions {
  margin-top: var(--space-6);
}

.foot {
  font-size: 0.875rem;
  color: var(--color-fg-muted);
}

.foot-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  padding-block: var(--space-8);
  border-top: 1px solid var(--color-border);
}

.foot p {
  margin: 0;
}