/*
 * Turnstile website — structural styles.
 *
 * Every color and type value here traces back to brand/tokens.css; nothing is
 * hardcoded. Touching brand? Start in brand/README.md, then use the tokens.
 *
 * The tokens are pulled in by relative import so the page opens correctly
 * straight off the filesystem (site/styles.css → brand/tokens.css). The
 * deploy workflow (#5) is responsible for making that same relationship hold
 * on GitHub Pages when it assembles the publishable bundle.
 */
@import url("brand/tokens.css");

/*
 * Dark mode.
 *
 * tokens.css gates its dark palette on `:root.dark` / `[data-theme="dark"]`,
 * which the app toggles in JavaScript. This static, framework-free site has no
 * such toggle, so we bridge the brand's dark surface tokens to the OS
 * preference. These are token-to-token reassignments (semantic → slate ramp) —
 * the exact mapping tokens.css uses for `:root.dark` — so no color *value* is
 * duplicated or hardcoded here; the logo and every surface follow along.
 */
@media (prefers-color-scheme: dark) {
  :root {
    --ts-color-bg: var(--ts-slate-900);
    --ts-color-surface: var(--ts-slate-800);
    --ts-color-header-bg: var(--ts-slate-800);
    --ts-color-border: var(--ts-slate-700);
    --ts-color-divider: var(--ts-slate-700);
    --ts-color-text: var(--ts-slate-100);
    --ts-color-text-muted: var(--ts-slate-400);
  }
}

/* ── Reset / base ────────────────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  /* 16px base — the type scale in tokens.css is built on this. */
  font-size: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--ts-color-bg);
  color: var(--ts-color-text);
  font-family: var(--ts-font-sans);
  font-size: var(--ts-text-base);
  line-height: var(--ts-leading-snug);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3 {
  font-family: var(--ts-font-serif);
  line-height: var(--ts-leading-tight);
  font-weight: var(--ts-weight-semibold);
  margin: 0 0 0.5em;
}

h1 {
  font-size: var(--ts-text-3xl);
}

h2 {
  font-size: var(--ts-text-2xl);
}

h3 {
  font-size: var(--ts-text-xl);
}

p {
  margin: 0 0 1em;
  line-height: var(--ts-leading-prose);
}

a {
  color: var(--ts-accent);
  text-decoration: none;
}

a:hover {
  color: var(--ts-accent-hover);
  text-decoration: underline;
}

code {
  font-family: var(--ts-font-mono);
  font-size: 0.9em;
}

/* ── Focus states (a11y) ─────────────────────────────────────────────── */
:focus-visible {
  outline: 3px solid var(--ts-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Skip link — visible only when focused. */
.skip-link {
  position: absolute;
  left: 0.5rem;
  top: -3rem;
  z-index: 10;
  padding: 0.5rem 0.875rem;
  background: var(--ts-accent);
  color: var(--ts-accent-text);
  font-weight: var(--ts-weight-medium);
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 0.5rem;
  color: var(--ts-accent-text);
  text-decoration: none;
}

/* ── Layout container ────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 60rem;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* ── Header / wordmark lockup ────────────────────────────────────────── */
.site-header {
  background: var(--ts-color-header-bg);
  border-bottom: 1px solid var(--ts-color-border);
}

.site-header .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1rem;
}

/*
 * The wordmark: the mark followed by "Turnstile" in serif semibold,
 * baseline-aligned with roughly half a cap height of gap between them
 * (brand/README.md → Wordmark). `color` drives the inline SVG via
 * currentColor, so the mark inverts with the surrounding text in dark mode.
 */
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  color: var(--ts-color-text);
  font-family: var(--ts-font-serif);
  font-weight: var(--ts-weight-semibold);
  font-size: var(--ts-text-xl);
  line-height: var(--ts-leading-tight);
}

.wordmark:hover {
  color: var(--ts-color-text);
  text-decoration: none;
}

.wordmark .logo {
  /* Mark sits at ~1.25× the wordmark cap height. */
  width: 1.6em;
  height: 1.6em;
  fill: currentColor;
}

/* ── Primary nav ─────────────────────────────────────────────────────── */
.site-nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav a {
  color: var(--ts-color-text-muted);
  font-weight: var(--ts-weight-medium);
}

.site-nav a:hover {
  color: var(--ts-accent);
}

/* ── Hero ────────────────────────────────────────────────────────────── */
.hero {
  padding-block: clamp(3rem, 10vw, 6rem);
  text-align: center;
}

.hero .logo-hero {
  width: clamp(4rem, 12vw, 6rem);
  height: clamp(4rem, 12vw, 6rem);
  color: var(--ts-color-text);
  fill: currentColor;
  margin-bottom: 1.5rem;
}

.hero p.lede {
  max-width: 38rem;
  margin-inline: auto;
  font-size: var(--ts-text-lg);
  color: var(--ts-color-text-muted);
}

/* ── Buttons ─────────────────────────────────────────────────────────── */
.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
  margin-top: 2rem;
}

.button {
  display: inline-block;
  padding: 0.625rem 1.25rem;
  border-radius: 6px;
  font-family: var(--ts-font-sans);
  font-weight: var(--ts-weight-medium);
  border: 1px solid transparent;
}

.button--primary {
  background: var(--ts-accent);
  color: var(--ts-accent-text);
}

.button--primary:hover {
  background: var(--ts-accent-hover);
  color: var(--ts-accent-text);
  text-decoration: none;
}

.button--secondary {
  background: transparent;
  color: var(--ts-color-text);
  border-color: var(--ts-color-border);
}

.button--secondary:hover {
  border-color: var(--ts-accent);
  color: var(--ts-accent);
  text-decoration: none;
}

/* ── Content sections ────────────────────────────────────────────────── */
main section {
  padding-block: 3rem;
  border-top: 1px solid var(--ts-color-divider);
}

.features {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  margin-top: 1.5rem;
}

.card {
  background: var(--ts-color-surface);
  border: 1px solid var(--ts-color-border);
  border-radius: 8px;
  padding: 1.5rem;
}

.card h3 {
  margin-top: 0;
}

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

/* ── Downloads ───────────────────────────────────────────────────────── */
.downloads {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  margin-block: 1.5rem;
}

.download h3 {
  margin-top: 0;
}

/* The buttons within a download card; wraps so .deb/.rpm/.AppImage flow. */
.download-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

/*
 * The OS-detection script (progressive enhancement) flags the visitor's most
 * likely card with data-recommended; surface it with an accent border and a
 * small label. Absent the script, no card carries the attribute and every
 * download stays equally visible.
 */
.download[data-recommended] {
  border-color: var(--ts-accent);
}

.download[data-recommended]::before {
  content: "Recommended for your system";
  display: block;
  margin-bottom: 0.75rem;
  font-size: var(--ts-text-sm);
  font-weight: var(--ts-weight-medium);
  color: var(--ts-accent);
}

.downloads-meta {
  color: var(--ts-color-text-muted);
  font-size: var(--ts-text-sm);
}

/* ── Footer ──────────────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--ts-color-border);
  background: var(--ts-color-header-bg);
  color: var(--ts-color-text-muted);
  font-size: var(--ts-text-sm);
}

.site-footer .container {
  padding-block: 2rem;
}

.footer-links ul {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  margin: 0 0 1rem;
  padding: 0;
  list-style: none;
}

.footer-links a {
  color: var(--ts-color-text-muted);
  font-weight: var(--ts-weight-medium);
}

.footer-links a:hover {
  color: var(--ts-accent);
}

.footer-meta {
  margin: 0;
}

/* ── Responsive ──────────────────────────────────────────────────────── */
@media (max-width: 32rem) {
  .site-header .container {
    flex-direction: column;
    align-items: flex-start;
  }
}