/* ============================================================
   iPadOS Safari Showcase — shared design system
   ============================================================ */

:root {
  color-scheme: light dark;

  /* Light palette — uses display-p3 where supported, falls back to sRGB. */
  --bg:         #f6f7fb;
  --surface:    rgba(255, 255, 255, 0.62);
  --surface-2:  rgba(255, 255, 255, 0.85);
  --text:       #0b1020;
  --text-muted: #535a76;
  --border:     rgba(15, 23, 42, 0.10);
  --accent:     #2563eb;
  --accent-2:   #8b5cf6;
  --accent-3:   #06b6d4;
  --danger:     #ef4444;
  --ok:         #10b981;

  --radius-sm: 10px;
  --radius:    18px;
  --radius-lg: 28px;

  --shadow-1: 0 1px 2px rgba(15, 23, 42, 0.06),
              0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-2: 0 6px 18px rgba(15, 23, 42, 0.10),
              0 24px 60px rgba(15, 23, 42, 0.14);

  --max-w: 1080px;

  --font-sys: -apple-system, "SF Pro Text", "SF Pro Display",
              system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --space-1: 0.375rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2.25rem;
  --space-6: 3.5rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:         #0a0d18;
    --surface:    rgba(28, 32, 50, 0.55);
    --surface-2:  rgba(28, 32, 50, 0.78);
    --text:       #e7ecf7;
    --text-muted: #9aa3bd;
    --border:     rgba(231, 236, 247, 0.08);
    --accent:     #7aa2ff;
    --accent-2:   #b794ff;
    --accent-3:   #5eead4;
  }
}

@media (color-gamut: p3) {
  :root {
    --accent:    color(display-p3 0.20 0.40 1.00);
    --accent-2:  color(display-p3 0.62 0.36 1.00);
    --accent-3:  color(display-p3 0.00 0.78 0.92);
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sys);
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100dvh;
}

/* Aurora background — a soft mesh-gradient that lives behind every page. */
body::before {
  content: "";
  position: fixed;
  inset: -10vmax;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(48vmax 38vmax at 18% 12%,
      color-mix(in oklab, var(--accent) 28%, transparent), transparent 60%),
    radial-gradient(40vmax 32vmax at 88% 20%,
      color-mix(in oklab, var(--accent-2) 26%, transparent), transparent 60%),
    radial-gradient(52vmax 42vmax at 60% 95%,
      color-mix(in oklab, var(--accent-3) 24%, transparent), transparent 60%);
  filter: blur(40px) saturate(1.05);
}

/* ============================================================
   Site header — sticky glass bar
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding:
    calc(env(safe-area-inset-top) + var(--space-2))
    max(var(--space-4), env(safe-area-inset-right))
    var(--space-2)
    max(var(--space-4), env(safe-area-inset-left));
  background: color-mix(in oklab, var(--bg) 72%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(24px);
  backdrop-filter: saturate(180%) blur(24px);
  border-bottom: 1px solid var(--border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 1rem;
  color: inherit;
  text-decoration: none;
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 4px 14px color-mix(in oklab, var(--accent) 35%, transparent);
}

.brand-mark.with-symbol {
  display: grid;
  place-items: center;
  color: white;
  font-weight: 700;
  font-size: 13px;
}

.nav {
  display: flex;
  gap: var(--space-1);
  margin-left: auto;
  flex-wrap: wrap;
}

.nav a {
  color: var(--text-muted);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.92rem;
  transition: color 0.15s ease, background 0.15s ease;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--text);
  background: var(--surface);
}

/* ============================================================
   Page layout
   ============================================================ */

main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding:
    var(--space-5)
    max(var(--space-4), env(safe-area-inset-right))
    calc(var(--space-6) + env(safe-area-inset-bottom))
    max(var(--space-4), env(safe-area-inset-left));
}

h1, h2, h3 {
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 var(--space-3);
}

h1 { font-size: clamp(2rem, 4vw + 1rem, 3.25rem); }
h2 { font-size: clamp(1.4rem, 1.5vw + 1rem, 2rem); margin-top: var(--space-5); }
h3 { font-size: 1.15rem; }

p { margin: 0 0 var(--space-3); color: var(--text); }
.lead { font-size: 1.18rem; color: var(--text-muted); max-width: 60ch; }

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

code, kbd {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: color-mix(in oklab, var(--text) 8%, transparent);
  padding: 1px 6px;
  border-radius: 6px;
}

/* ============================================================
   Hero
   ============================================================ */

.hero {
  padding: var(--space-5) 0 var(--space-4);
}

.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-2);
}

/* ============================================================
   Glass card — the core surface primitive
   ============================================================ */

.card {
  background: var(--surface);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-4);
  box-shadow: var(--shadow-1);
  transition:
    transform 0.25s cubic-bezier(0.2, 0.8, 0.2, 1),
    box-shadow 0.25s ease,
    border-color 0.25s ease;
}

.card.is-tall { padding: var(--space-5); }

a.card,
.card-link {
  display: block;
  color: inherit;
  text-decoration: none;
}

a.card:hover,
.card-link:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  border-color: color-mix(in oklab, var(--accent) 40%, var(--border));
}

a.card:hover { text-decoration: none; }

/* ============================================================
   Feature grid (home + demos catalog)
   ============================================================ */

.grid {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
  margin-top: var(--space-4);
}

.feature {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  min-height: 200px;
}

.feature .icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: linear-gradient(135deg,
    color-mix(in oklab, var(--accent) 80%, white 20%),
    color-mix(in oklab, var(--accent-2) 80%, white 20%));
  display: grid;
  place-items: center;
  color: white;
  font-size: 20px;
  box-shadow: 0 6px 18px color-mix(in oklab, var(--accent) 30%, transparent);
}

.feature h3 { margin: 0; font-size: 1.05rem; }
.feature p  { margin: 0; color: var(--text-muted); font-size: 0.95rem; }
.feature .tag {
  margin-top: auto;
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: color-mix(in oklab, var(--accent) 14%, transparent);
  padding: 3px 8px;
  border-radius: 999px;
}

/* ============================================================
   Buttons & form controls
   ============================================================ */

.button,
button.button {
  appearance: none;
  -webkit-appearance: none;
  border: 1px solid color-mix(in oklab, var(--accent) 35%, var(--border));
  background: color-mix(in oklab, var(--accent) 12%, var(--surface-2));
  color: var(--text);
  padding: 10px 18px;
  border-radius: 999px;
  font: inherit;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.1s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.button.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent;
  color: white;
  box-shadow: 0 10px 24px color-mix(in oklab, var(--accent) 35%, transparent);
}

.button:hover { transform: translateY(-1px); }
.button:active { transform: translateY(0); }
.button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

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

input[type="text"],
input[type="search"],
input[type="range"],
select,
textarea {
  font: inherit;
  color: inherit;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 32px;
  background: transparent;
  padding: 0;
  border: 0;
}

input[type="range"]::-webkit-slider-runnable-track {
  height: 6px;
  border-radius: 3px;
  background: color-mix(in oklab, var(--accent) 30%, var(--border));
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid white;
  margin-top: -9px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

/* ============================================================
   Demo page chrome
   ============================================================ */

.demo-header {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.demo-header .crumb {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.demo-stage {
  padding: var(--space-4);
  min-height: 320px;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.controls .label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-right: 4px;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.85rem;
  background: var(--surface-2);
  border: 1px solid var(--border);
}

.status::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-muted);
}

.status.is-ok::before { background: var(--ok); }
.status.is-warn::before { background: #f59e0b; }
.status.is-err::before { background: var(--danger); }

.fallback {
  margin-top: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  background: color-mix(in oklab, var(--danger) 8%, var(--surface-2));
  border: 1px solid color-mix(in oklab, var(--danger) 25%, var(--border));
  color: var(--text);
  font-size: 0.95rem;
}

.notes {
  margin-top: var(--space-4);
  color: var(--text-muted);
  font-size: 0.95rem;
}

.notes h2 {
  color: var(--text);
  font-size: 1.1rem;
  margin: var(--space-4) 0 var(--space-2);
}

/* ============================================================
   Footer
   ============================================================ */

.site-footer {
  max-width: var(--max-w);
  margin: var(--space-6) auto var(--space-3);
  padding:
    var(--space-3)
    max(var(--space-4), env(safe-area-inset-right))
    calc(var(--space-3) + env(safe-area-inset-bottom))
    max(var(--space-4), env(safe-area-inset-left));
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
  justify-content: space-between;
}

/* ============================================================
   Utilities
   ============================================================ */

.stack > * + * { margin-top: var(--space-3); }
.row { display: flex; flex-wrap: wrap; gap: var(--space-2); align-items: center; }
.muted { color: var(--text-muted); }
.center { text-align: center; }
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* Container queries — used by some demo cards */
.cq { container-type: inline-size; }

/* View transitions (Safari supports the cross-document version). */
@view-transition { navigation: auto; }

::view-transition-old(root),
::view-transition-new(root) {
  animation-duration: 280ms;
  animation-timing-function: cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  body::before { filter: none; }
}