/*
  Persian Markdown Editor landing page stylesheet.

  Design tokens are COPIED from the app's theme (web/src), not imported.
  See PLAN.md §11: a zero-dependency static page should not depend on the
  app's Tailwind v4 build. If the two drift by a few percent of gray,
  nothing breaks.

  Rules:
  - one neutral OKLCH ramp (chroma 0 everywhere, strictly monochrome),
    light by default, dark via prefers-color-scheme
  - --radius: 2px, used uniformly, including on the "avatar" cursor tag
    in the hero mockup (a square, not a circle)
  - structure from 1px borders, never box-shadow
  - logical properties only, no left/right
*/

/* ---------- Fonts (self-hosted, no CDN) ---------- */

/* Fallback statics for browsers without variable-font support. */
/*
 * The single variable file serves every weight from 100 to 900.
 *
 * Static Regular/Medium/Bold faces were declared alongside it and won
 * the font-matching contest regardless of declaration order, so the
 * browser fetched all four files and the preloaded variable one went
 * unused. Declaring only this face removes the ambiguity: one request,
 * 111KB, every weight. Variable font support is universal in browsers
 * that can render the rest of this page.
 */
@font-face {
  font-family: "Vazirmatn";
  src: url("assets/fonts/Vazirmatn[wght].woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
/* ---------- Design tokens ---------- */

:root {
  --radius: 2px;

  --font-sans: "Vazirmatn", ui-sans-serif, system-ui, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, "Vazirmatn", monospace;

  --max-width: 72rem;

  /* Neutral OKLCH ramp, light (default) */
  --background: oklch(98.5% 0 0);
  --surface: oklch(100% 0 0);
  --surface-raised: oklch(96.5% 0 0);
  --foreground: oklch(17% 0 0);
  --muted: oklch(94% 0 0);
  --muted-foreground: oklch(40% 0 0);
  --border: oklch(85% 0 0);
  --border-strong: oklch(72% 0 0);
  --focus-ring: oklch(17% 0 0);
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: oklch(15% 0 0);
    --surface: oklch(18.5% 0 0);
    --surface-raised: oklch(22% 0 0);
    --foreground: oklch(96% 0 0);
    --muted: oklch(24% 0 0);
    --muted-foreground: oklch(68% 0 0);
    --border: oklch(32% 0 0);
    --border-strong: oklch(44% 0 0);
    --focus-ring: oklch(96% 0 0);
  }
}

/* ---------- Reset ---------- */

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

html {
  color-scheme: light dark;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--background);
  color: var(--foreground);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
}

h1,
h2,
h3,
p,
figure {
  margin: 0;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

button {
  font: inherit;
  color: inherit;
}

/* ---------- Focus states ---------- */

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
  border-radius: var(--radius);
}

/* ---------- Skip link ---------- */

.skip-link {
  position: absolute;
  inset-inline-start: 1rem;
  top: -3rem;
  background: var(--foreground);
  color: var(--background);
  padding: 0.6rem 1rem;
  border-radius: var(--radius);
  z-index: 100;
  transition: top 0.15s ease;
}

.skip-link:focus-visible {
  top: 1rem;
  outline-color: var(--background);
}

/* ---------- Layout helpers ---------- */

.wrap {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}

section {
  padding-block: clamp(3rem, 8vw, 6rem);
}

/* ---------- Header ---------- */

.site-header {
  border-block-end: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--background);
  z-index: 10;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 0.9rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: var(--radius);
  border: 1px solid var(--border-strong);
  display: grid;
  place-items: center;
  background: var(--surface-raised);
  flex-shrink: 0;
}

.brand-mark svg {
  width: 16px;
  height: 16px;
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 3vw, 1.75rem);
}

.main-nav a {
  text-decoration: none;
  color: var(--muted-foreground);
  font-size: 0.95rem;
  padding-block: 0.25rem;
  border-block-end: 1px solid transparent;
}

.main-nav a:hover {
  color: var(--foreground);
  border-block-end-color: var(--border-strong);
}

.nav-icon {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-icon svg {
  width: 16px;
  height: 16px;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius);
  border: 1px solid var(--border-strong);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  line-height: 1;
  white-space: nowrap;
}

.btn svg {
  width: 16px;
  height: 16px;
}

.btn-primary {
  background: var(--foreground);
  color: var(--background);
  border-color: var(--foreground);
}

.btn-primary:hover {
  opacity: 0.88;
}

.btn-secondary {
  background: var(--surface);
  color: var(--foreground);
}

.btn-secondary:hover {
  background: var(--muted);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  padding-block-start: 0.5rem;
}

/* ---------- Hero ---------- */

.hero .wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(2rem, 6vw, 3.5rem);
  align-items: center;
}

@media (min-width: 64rem) {
  .hero .wrap {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.15fr);
  }
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  color: var(--muted-foreground);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.25rem 0.65rem;
  margin-block-end: 1rem;
}

.hero h1 {
  font-size: clamp(2.1rem, 4.5vw, 3.2rem);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.hero .lede {
  margin-block-start: 1.1rem;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--muted-foreground);
  max-width: 42ch;
}

/* ---------- Hero mockup ---------- */

.mockup-frame {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 0.75rem;
}

.mockup-frame svg {
  width: 100%;
  height: auto;
}

.mockup-frame .frame-bg {
  fill: var(--surface);
}

.mockup-frame .titlebar-bg {
  fill: var(--surface-raised);
}

.mockup-frame .stroke-border {
  stroke: var(--border);
}

.mockup-frame .stroke-strong {
  stroke: var(--border-strong);
}

.mockup-frame .fill-border {
  fill: var(--border);
}

.mockup-frame .fill-strong {
  fill: var(--border-strong);
}

.mockup-frame .fill-muted {
  fill: var(--muted);
}

.mockup-frame .text-fg {
  fill: var(--foreground);
  font-family: var(--font-sans);
}

.mockup-frame .text-muted {
  fill: var(--muted-foreground);
  font-family: var(--font-sans);
}

.mockup-frame .text-mono {
  fill: var(--foreground);
  font-family: var(--font-mono);
}

/* ---------- Section headings ---------- */

.section-head {
  max-width: 46ch;
  margin-block-end: clamp(2rem, 5vw, 3rem);
}

.section-head .eyebrow {
  display: block;
  font-size: 0.85rem;
  color: var(--muted-foreground);
  margin-block-end: 0.5rem;
}

.section-head h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1.35;
}

/* ---------- Features ---------- */

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.feature-card {
  background: var(--surface);
  padding: 1.75rem 1.5rem;
}

.feature-icon {
  width: 20px;
  height: 20px;
  margin-block-end: 1rem;
  color: var(--foreground);
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-block-end: 0.5rem;
}

.feature-card p {
  color: var(--muted-foreground);
  font-size: 0.95rem;
}

/* ---------- Self-hosting ---------- */

.self-host-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: clamp(1.5rem, 4vw, 2.5rem);
}

.self-host-panel p {
  color: var(--muted-foreground);
  max-width: 60ch;
  margin-block-end: 1.25rem;
}

.code-block {
  background: var(--surface-raised);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  overflow-x: auto;
}

.code-block pre {
  margin: 0;
}

.code-block code {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  white-space: pre;
}

/* Any Latin-script code/label inside the RTL page must be forced LTR,
   both for correct glyph order and so it stays copyable/selectable
   left-to-right. See PLAN.md §11. */
[dir="ltr"] {
  unicode-bidi: isolate;
}

.inline-code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--muted);
  border-radius: var(--radius);
  padding: 0.1em 0.4em;
}

/* ---------- Footer ---------- */

.site-footer {
  border-block-start: 1px solid var(--border);
  padding-block: 2.5rem;
}

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

.footer-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  text-decoration: none;
  color: var(--muted-foreground);
  font-size: 0.9rem;
}

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

.footer-links svg {
  width: 16px;
  height: 16px;
}

.site-footer small {
  color: var(--muted-foreground);
  font-size: 0.85rem;
}

/* ---------- Visually hidden ---------- */

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}