/* Devia Desktop — GitHub Pages site
   Dark theme inspired by the app's M3 dark palette (--dv-* tokens). */

:root {
  --bg: #121212;
  --bg-alt: #1a1a1f;
  --surface: #1e1e24;
  --surface-2: #26262e;
  --border: #34343e;
  --text: #e6e6eb;
  --text-dim: #a6a6b3;
  --acc: #8ab4f8;
  --acc-strong: #aecbfa;
  --acc-contrast: #0b1526;
  --radius: 0.75rem;
  --maxw: 70rem;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; }

a { color: var(--acc); text-decoration: none; }
a:hover { color: var(--acc-strong); text-decoration: underline; }

code {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 0.3em;
  padding: 0.1em 0.35em;
  font-size: 0.9em;
}

pre {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  overflow-x: auto;
}
pre code { background: none; border: 0; padding: 0; }

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(18, 18, 18, 0.85);
  backdrop-filter: blur(0.5rem);
  border-bottom: 1px solid var(--border);
}

.nav {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 3.5rem;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
}
.brand:hover { text-decoration: none; color: var(--text); }
.brand img { border-radius: 0.4rem; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.nav-links a { color: var(--text-dim); white-space: nowrap; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); }

.nav-toggle {
  display: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  color: var(--text);
  padding: 0.35rem 0.65rem;
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
}
.nav-toggle:hover { background: var(--surface-2); }

/* ---------- language switcher ---------- */

.lang-switch { display: inline-flex; align-items: center; }

.lang-select {
  appearance: none;
  -webkit-appearance: none;
  background: var(--surface)
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='%23a6a6b3' d='M0 0l5 6 5-6z'/%3E%3C/svg%3E")
    no-repeat right 0.7rem center;
  border: 1px solid var(--border);
  border-radius: 2rem;
  color: var(--text);
  font: inherit;
  font-size: 0.95rem;
  padding: 0.35rem 2rem 0.35rem 0.9rem;
  cursor: pointer;
}
.lang-select:hover { background-color: var(--surface-2); }
.lang-select:focus-visible { outline: 2px solid var(--acc); outline-offset: 2px; }
.lang-select option { background: var(--surface); color: var(--text); }

[dir="rtl"] .lang-select {
  background-position: left 0.7rem center;
  padding: 0.35rem 0.9rem 0.35rem 2rem;
}

/* Visually hidden but available to assistive tech. */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

/* ---------- buttons ---------- */

.btn {
  display: inline-block;
  border: 1px solid var(--border);
  border-radius: 2rem;
  padding: 0.6rem 1.4rem;
  color: var(--text);
  background: var(--surface);
  font-weight: 600;
  transition: background 0.15s ease, border-color 0.15s ease;
}
.btn:hover { background: var(--surface-2); text-decoration: none; color: var(--text); }

.btn-primary {
  background: var(--acc);
  border-color: var(--acc);
  color: var(--acc-contrast);
}
.btn-primary:hover { background: var(--acc-strong); border-color: var(--acc-strong); color: var(--acc-contrast); }

.btn-sm { padding: 0.35rem 1rem; font-size: 0.95rem; }

/* ---------- hero ---------- */

.hero {
  text-align: center;
  padding: 5rem 0 4rem;
  background:
    radial-gradient(60rem 30rem at 50% -10rem, rgba(138, 180, 248, 0.12), transparent),
    var(--bg);
}

.hero-logo { border-radius: 1.25rem; margin-bottom: 1.5rem; }

.hero h1 {
  font-size: clamp(1.8rem, 4.5vw, 3rem);
  line-height: 1.15;
  margin: 0 0 1rem;
}

.lead {
  max-width: 46rem;
  margin: 0 auto 1.5rem;
  color: var(--text-dim);
  font-size: 1.15rem;
}

.lead-sm {
  max-width: 50rem;
  color: var(--text-dim);
  font-size: 1.05rem;
}

.hero-badges { display: flex; flex-wrap: wrap; gap: 0.6rem; justify-content: center; margin-bottom: 2rem; }

.badge {
  display: inline-block;
  border: 1px solid var(--border);
  border-radius: 2rem;
  padding: 0.25rem 0.9rem;
  font-size: 0.85rem;
  color: var(--text-dim);
  background: var(--surface);
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 0.9rem; justify-content: center; }

/* ---------- sections ---------- */

.section { padding: 4rem 0; }
.section-alt { background: var(--bg-alt); border-block: 1px solid var(--border); }
.section h2 { font-size: 1.75rem; margin: 0 0 1.5rem; }
.section-inner { margin-top: 3rem; }
.center { text-align: center; }
.center .lead-sm { margin-inline: auto; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr));
  gap: 1.25rem;
}

.grid-platforms { grid-template-columns: repeat(auto-fill, minmax(20rem, 1fr)); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
.card h3 { margin: 0 0 0.6rem; font-size: 1.1rem; }
.card p { margin: 0; color: var(--text-dim); font-size: 0.97rem; }

.cols-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 2rem;
  margin-top: 2rem;
}
.cols-3 h3 { margin: 0 0 0.5rem; color: var(--acc); }
.cols-3 p { color: var(--text-dim); margin: 0; }

/* ---------- downloads ---------- */

.platform h2 { font-size: 1.3rem; margin: 0 0 0.6rem; }
.platform .btn { margin: 0.5rem 0.5rem 0.25rem 0; }
.platform .hint { font-size: 0.85rem; margin-top: 0.9rem; }
.dl-fallback { color: var(--text-dim); font-style: italic; margin: 0.75rem 0 0; }

/* ---------- docs ---------- */

.docs-layout {
  display: grid;
  grid-template-columns: 14rem minmax(0, 1fr);
  gap: 3rem;
  padding-top: 2.5rem;
  padding-bottom: 4rem;
}

.docs-toc nav {
  position: sticky;
  top: 5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.95rem;
}
.docs-toc strong { margin-bottom: 0.25rem; }
.docs-toc a { color: var(--text-dim); }
.docs-toc a:hover { color: var(--text); text-decoration: none; }

.docs-content h1 { font-size: 2rem; margin-top: 0; }
.docs-content section { margin-bottom: 3rem; }
.docs-content h2 {
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.4rem;
  margin-top: 2.5rem;
}
.docs-content h3 { margin-top: 1.75rem; }
.docs-content li { margin-bottom: 0.35rem; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}
th, td {
  text-align: left;
  border: 1px solid var(--border);
  padding: 0.55rem 0.8rem;
}
th { background: var(--surface); }
tr:nth-child(even) td { background: var(--bg-alt); }

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-alt);
  padding: 2.5rem 0 1.5rem;
  margin-top: 2rem;
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 2rem;
}
.footer-grid p { color: var(--text-dim); margin: 0.25rem 0 0; }

.footer-links { display: flex; flex-direction: column; gap: 0.4rem; }

.copyright {
  margin-top: 2rem;
  color: var(--text-dim);
  font-size: 0.85rem;
}

/* ---------- responsive ---------- */

@media (max-width: 52rem) {
  .nav-toggle { display: inline-block; }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg-alt);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem 1.25rem 1rem;
    box-shadow: 0 0.75rem 1.5rem rgba(0, 0, 0, 0.4);
  }
  .nav.nav-open .nav-links { display: flex; }

  .nav-links a { padding: 0.65rem 0; }
  .nav-links .btn { align-self: flex-start; margin-top: 0.5rem; padding: 0.5rem 1.25rem; }
}

@media (max-width: 48rem) {
  .docs-layout { grid-template-columns: 1fr; gap: 1.5rem; }
  .docs-toc nav { position: static; }
  .hero { padding: 3.5rem 0 3rem; }
}

/* ---------- RTL (Arabic) ---------- */

[dir="rtl"] th,
[dir="rtl"] td { text-align: right; }
[dir="rtl"] .footer-links,
[dir="rtl"] .docs-toc nav { text-align: right; }
[dir="rtl"] .copyright { text-align: right; }