/* Lupinus landing page. Palette mirrors the app (frontend/src/style.css):
   Space Black / Deep Violet ground, Lupinus Violet -> Sakura accent. Dark by
   default, light when the visitor's system asks for it. Logical properties
   throughout so right-to-left languages mirror correctly. */

:root {
  color-scheme: dark;
  --bg: #090711;
  --bg-2: #0d0a18;
  --surface: #151024;
  --surface-2: #1e1633;
  --border: rgba(237, 233, 255, 0.10);
  --border-strong: rgba(124, 92, 255, 0.45);
  --text: #ede9ff;
  --text-soft: rgba(237, 233, 255, 0.70);
  --text-faint: rgba(237, 233, 255, 0.45);
  --accent: #7c5cff;
  --accent-2: #f29bcb;
  --grad: linear-gradient(120deg, #7c5cff, #f29bcb);
  --on-accent: #0c0916;
  --glow-1: rgba(124, 92, 255, 0.28);
  --glow-2: rgba(242, 155, 203, 0.16);
  --shadow: 0 30px 80px -30px rgba(0, 0, 0, 0.75);
  --radius: 18px;
  --font: 'Inter', 'Segoe UI', system-ui, -apple-system, 'Noto Sans', 'Noto Sans Arabic', 'Noto Sans Hebrew', 'Noto Sans Devanagari', 'Noto Sans Bengali', 'Noto Sans Thai', 'Noto Sans CJK SC', sans-serif;
}

@media (prefers-color-scheme: light) {
  :root {
    color-scheme: light;
    --bg: #f6f3fc;
    --bg-2: #fbfaff;
    --surface: #ffffff;
    --surface-2: #f1ecfb;
    --border: rgba(36, 22, 61, 0.12);
    --border-strong: rgba(124, 92, 255, 0.4);
    --text: #241639;
    --text-soft: rgba(36, 22, 61, 0.72);
    --text-faint: rgba(36, 22, 61, 0.5);
    --accent-2: #d6579d;
    --grad: linear-gradient(120deg, #7c5cff, #d6579d);
    --on-accent: #ffffff;
    --glow-1: rgba(124, 92, 255, 0.16);
    --glow-2: rgba(214, 87, 157, 0.10);
    --shadow: 0 30px 70px -35px rgba(60, 30, 100, 0.4);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
/* Ambient glow lives on a fixed layer rather than background-attachment:
   fixed, which forces a repaint of the whole page on every scroll frame. */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(60rem 40rem at 15% -10%, var(--glow-1), transparent 60%),
    radial-gradient(50rem 36rem at 95% 5%, var(--glow-2), transparent 60%);
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; inset-inline-start: 1rem; top: -4rem; background: var(--surface); padding: .5rem 1rem; border-radius: 8px; z-index: 10; }
.skip:focus { top: 1rem; }
.ico { width: 1.4rem; height: 1.4rem; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; flex: none; }
.os .ico { fill: currentColor; stroke: none; }
.os .ico rect, .os .ico path[d^="m7"] { fill: none; stroke: currentColor; stroke-width: 1.7; }

/* ---------- header ---------- */
.nav {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: center; gap: 1.25rem;
  padding: .75rem max(1rem, calc((100vw - 1120px) / 2));
  /* Near-opaque instead of a backdrop blur: blur made some GPUs drop whole
     frames while scrolling. */
  background: color-mix(in srgb, var(--bg) 94%, transparent);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: .6rem; font-weight: 700; font-size: 1.1rem; text-decoration: none; letter-spacing: .01em; }
.nav-links { margin-inline-start: auto; display: flex; gap: 1.25rem; }
.nav-links a { color: var(--text-soft); text-decoration: none; font-size: .95rem; }
.nav-links a:hover { color: var(--text); }
.lang { display: flex; align-items: center; gap: .4rem; color: var(--text-soft); }
.lang select {
  appearance: none; -webkit-appearance: none;
  font: inherit; font-size: .9rem; color: var(--text);
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 10px; padding: .4rem .8rem; cursor: pointer; max-width: 11rem;
}
.lang select:hover, .lang select:focus-visible { border-color: var(--border-strong); outline: none; }

/* ---------- layout ---------- */
main { max-width: 1120px; margin-inline: auto; padding-inline: 1rem; }
.section { padding-block: 4.5rem; }
.section > h2 { font-size: clamp(1.6rem, 3.4vw, 2.3rem); line-height: 1.2; margin: 0 0 1.75rem; text-align: center; text-wrap: balance; }
.sub { text-align: center; color: var(--text-soft); max-width: 42rem; margin: -.75rem auto 2rem; text-wrap: balance; }

/* ---------- hero ---------- */
.hero { padding-block: 4rem 2rem; text-align: center; }
.hero-copy { max-width: 46rem; margin-inline: auto; }
.eyebrow { display: inline-flex; align-items: center; gap: .5rem; margin: 0 0 1.25rem; padding: .3rem .8rem; border: 1px solid var(--border); border-radius: 999px; background: var(--surface); font-size: .85rem; color: var(--text-soft); }
.eyebrow .dot { width: .5rem; height: .5rem; border-radius: 50%; background: var(--grad); }
.eyebrow:has(#latest[hidden]) { display: none; }
h1 {
  font-size: clamp(2.2rem, 5.6vw, 3.8rem); line-height: 1.1; margin: 0 0 1.25rem; letter-spacing: -.02em; text-wrap: balance;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.lead { font-size: clamp(1.05rem, 2vw, 1.25rem); color: var(--text-soft); margin: 0 auto 2rem; text-wrap: balance; }
.cta { display: flex; flex-wrap: wrap; justify-content: center; gap: .75rem; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: .75rem 1.4rem; border-radius: 12px; text-decoration: none; font-weight: 600; font-size: 1rem;
  color: var(--text); background: var(--surface); border: 1px solid var(--border);
  transition: transform .15s ease, border-color .15s ease, background .15s ease;
}
.btn:hover { transform: translateY(-1px); border-color: var(--border-strong); background: var(--surface-2); }
.btn.primary { color: var(--on-accent); background: var(--grad); border-color: transparent; box-shadow: 0 10px 30px -10px var(--glow-1); }
.btn.primary:hover { background: var(--grad); filter: brightness(1.08); }
.btn.ghost { background: transparent; }
.meta { margin: 1.25rem 0 0; color: var(--text-faint); font-size: .9rem; }

.shot { margin: 3rem 0 0; }
.frame { border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface); overflow: hidden; box-shadow: var(--shadow); }
.frame img { width: 100%; }
#screens .shot { margin-top: 0; max-width: 900px; margin-inline: auto; }

/* ---------- cards ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(16.5rem, 1fr)); gap: 1rem; }
#features .grid { grid-template-columns: repeat(auto-fit, minmax(14.5rem, 1fr)); }
.card { padding: 1.4rem; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); transition: border-color .2s ease, transform .2s ease; }
.card:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.card .ico { color: var(--accent); width: 1.7rem; height: 1.7rem; margin-bottom: .75rem; }
.card h3 { margin: 0 0 .4rem; font-size: 1.08rem; }
.card p { margin: 0; color: var(--text-soft); font-size: .95rem; }

/* ---------- downloads ---------- */
.dl-grid { grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr)); }
.os h3 { display: flex; align-items: center; gap: .6rem; margin-bottom: 1rem; }
.os .ico { margin: 0; }
.os.match { border-color: var(--border-strong); box-shadow: 0 0 0 1px var(--border-strong), 0 20px 50px -30px var(--glow-1); }
.files { list-style: none; margin: 0; padding: 0; display: grid; gap: .5rem; }
.files a {
  display: flex; align-items: center; justify-content: space-between; gap: .75rem;
  padding: .6rem .9rem; border-radius: 10px; text-decoration: none; font-size: .95rem;
  background: var(--bg-2); border: 1px solid var(--border);
  transition: border-color .15s ease, background .15s ease;
}
.files a:hover { border-color: var(--border-strong); background: var(--surface-2); }
.files em { font-style: normal; font-size: .8rem; color: var(--text-faint); font-variant-numeric: tabular-nums; white-space: nowrap; }
.note { text-align: center; color: var(--text-faint); font-size: .88rem; margin: 1.5rem auto 0; max-width: 46rem; }
.note a { color: var(--accent-2); margin-inline-start: .35rem; white-space: nowrap; }

.open { text-align: center; }
.open .sub { margin-top: 0; }

/* ---------- footer ---------- */
.foot {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem 2rem;
  max-width: 1120px; margin: 2rem auto 0; padding: 1.75rem 1rem 2.5rem;
  border-top: 1px solid var(--border); color: var(--text-faint); font-size: .9rem;
}
.foot a { color: var(--text-soft); }

/* ---------- small screens ---------- */
@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav .lang { margin-inline-start: auto; }
  .section { padding-block: 3rem; }
  .hero { padding-block: 2.5rem 1rem; }
  .btn { width: 100%; }
  .cta { flex-direction: column; }
}

/* ---------- language links (crawlable, also a handy fallback for the select) ---------- */
.foot { flex-direction: column; gap: 1rem; }
.langs { display: flex; flex-wrap: wrap; justify-content: center; gap: .35rem 1rem; }
.langs a { color: var(--text-soft); text-decoration: none; font-size: .85rem; }
.langs a:hover { color: var(--text); text-decoration: underline; }
.langs a[aria-current] { color: var(--accent-2); font-weight: 600; }
.foot-row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem 2rem; }