/* One Tech For All — site styles. Tokens first; components below.
   System fonts only. No JavaScript is required for any layout. */

:root {
  /* Color (semantic). Contrast ratios are checked in docs/brand-guidelines.md. */
  --color-bg: #ffffff;
  --color-surface: #eef3f9;
  --color-ink: #17202e;
  --color-muted: #435064;
  --color-accent: #0a4a8f;
  --color-accent-strong: #073564;
  --color-on-accent: #ffffff;
  --color-border: #c9d3df;
  --color-focus: #0a4a8f;

  /* Typography */
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --text-base: 1.125rem;
  --text-small: 1rem;
  --leading: 1.6;
  --measure: 68ch;

  /* Spacing and layout */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --gutter: 1rem;
  --wrap: 72rem;
  --radius: 0.5rem;
  --border: 1px solid var(--color-border);
  --target: 2.75rem;
  --focus-ring: 3px solid var(--color-focus);
}

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

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading);
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-accent);
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--color-accent-strong);
  text-decoration-thickness: 0.14em;
}

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

main:focus {
  outline: none;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

@media (min-width: 48em) {
  :root {
    --gutter: 2rem;
  }
}

.skip-link {
  position: absolute;
  left: var(--space-1);
  top: -4rem;
  z-index: 10;
  padding: var(--space-1) var(--space-2);
  background: var(--color-ink);
  color: #ffffff;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: var(--space-1);
}

/* Header and navigation */
.site-header {
  border-bottom: var(--border);
}

.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-1) var(--space-3);
  padding-block: var(--space-1);
}

.brand {
  display: inline-flex;
  align-items: center;
  min-height: var(--target);
  color: var(--color-ink);
  font-weight: 700;
  font-size: 1.25rem;
  text-decoration: none;
}

.nav-list,
.footer-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0 var(--space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-list a,
.footer-list a {
  display: inline-flex;
  align-items: center;
  min-height: var(--target);
  padding-inline: 0.25rem;
}

.nav-list a[aria-current] {
  font-weight: 700;
  text-decoration-thickness: 0.2em;
}

/* Breadcrumbs */
.breadcrumbs {
  padding-block: var(--space-2) 0;
  font-size: var(--text-small);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumbs li:not(:last-child)::after {
  content: "/";
  margin-left: 0.5rem;
  color: var(--color-muted);
}

/* Content */
.page {
  padding-block: var(--space-4);
}

.prose > *,
.hero__inner > * {
  max-width: var(--measure);
}

h1,
h2,
h3 {
  line-height: 1.2;
  text-wrap: balance;
}

h1 {
  margin: 0 0 var(--space-2);
  font-size: clamp(1.9rem, 1.2rem + 3vw, 3rem);
}

h2 {
  margin: var(--space-4) 0 var(--space-1);
  font-size: clamp(1.4rem, 1.1rem + 1.2vw, 1.9rem);
}

h3 {
  margin: var(--space-3) 0 0.25rem;
  font-size: 1.2rem;
}

p,
ul,
ol {
  margin-block: 0 var(--space-2);
}

li + li {
  margin-top: 0.35rem;
}

/* Horizontal link rows space themselves with `gap`; the stacked-list margin above would
   push every item after the first down. */
.nav-list li + li,
.footer-list li + li,
.breadcrumbs li + li {
  margin-top: 0;
}

.lede {
  font-size: 1.25rem;
  color: var(--color-muted);
}

.meta {
  color: var(--color-muted);
  font-size: var(--text-small);
}

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--target);
  padding: 0.5rem 1.25rem;
  border: 2px solid var(--color-accent);
  border-radius: var(--radius);
  background: var(--color-accent);
  color: var(--color-on-accent);
  font-weight: 700;
  text-decoration: none;
}

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

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

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

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-2);
}

/* Home hero */
.hero {
  background: var(--color-surface);
  padding-block: var(--space-5);
}

.hero .lede {
  color: var(--color-ink);
}

.hero__note {
  margin-top: var(--space-2);
  color: var(--color-muted);
  font-size: var(--text-small);
}

/* Cards and grids */
.section {
  padding-block: var(--space-4);
}

.section > .wrap > h2:first-child {
  margin-top: 0;
}

.cards {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 17rem), 1fr));
  margin: var(--space-3) 0 0;
  padding: 0;
  list-style: none;
}

.cards + * {
  margin-top: var(--space-3);
}

.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  height: 100%;
  padding: var(--space-3);
  border: var(--border);
  border-radius: var(--radius);
  background: var(--color-bg);
}

.card h3 {
  margin: 0;
}

.card p {
  margin: 0;
}

.card .card__link {
  margin-top: auto;
  padding-top: var(--space-1);
  font-weight: 700;
}

.steps {
  max-width: var(--measure);
  padding-left: 1.5rem;
}

.principles {
  max-width: var(--measure);
}

/* Table (solutions comparison) */
.table-wrap {
  overflow-x: auto;
  margin-block: var(--space-2);
}

table {
  width: 100%;
  min-width: 36rem;
  border-collapse: collapse;
  font-size: var(--text-small);
}

caption {
  padding-bottom: var(--space-1);
  text-align: left;
  font-weight: 700;
}

th,
td {
  padding: 0.75rem;
  border: var(--border);
  text-align: left;
  vertical-align: top;
}

thead th {
  background: var(--color-surface);
}

/* Call-to-action band */
.cta-band {
  background: var(--color-surface);
  padding-block: var(--space-4);
}

.cta-band__inner > * {
  max-width: var(--measure);
}

.cta-band h2 {
  margin-top: 0;
}

/* Blog */
.empty-state {
  max-width: var(--measure);
  padding: var(--space-3);
  border: var(--border);
  border-radius: var(--radius);
  background: var(--color-surface);
}

.article-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.article-list li {
  padding-block: var(--space-2);
  border-top: var(--border);
}

.article-list h2 {
  margin: 0 0 0.25rem;
  font-size: 1.4rem;
}

/* Contact */
.contact-email {
  font-size: 1.35rem;
  font-weight: 700;
  overflow-wrap: anywhere;
}

/* Prose elements from Markdown */
blockquote {
  margin: var(--space-2) 0;
  padding-left: var(--space-2);
  border-left: 4px solid var(--color-border);
  color: var(--color-muted);
}

code,
pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.95em;
}

pre {
  overflow-x: auto;
  padding: var(--space-2);
  background: var(--color-surface);
  border-radius: var(--radius);
}

/* Footer */
.site-footer {
  margin-top: var(--space-4);
  padding-block: var(--space-4);
  border-top: var(--border);
  background: var(--color-surface);
  font-size: var(--text-small);
}

.site-footer__inner {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 18rem), 1fr));
}

.site-footer__name {
  margin-bottom: 0.25rem;
  font-weight: 700;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

@media (forced-colors: active) {
  .button {
    border: 2px solid ButtonText;
  }
}