/* Arcatua shared shell design system — used by index/about/apps hub/settings/legal pages.
   Individual apps (e.g. apps/crash-lab) keep their own self-contained styling. */

:root {
  color-scheme: light;
  --surface:        #f5f3ee;
  --surface-panel:  #fdfcfa;
  --ink-1:          #16151c;
  --ink-2:          #55525f;
  --ink-3:          #8b8894;
  --hairline:       #e2ddd3;
  --hairline-strong: rgba(22,21,28,0.16);
  --accent:         #4b3f9e;
  --accent-ink:     #ffffff;
  --accent-soft:    rgba(75,63,158,0.08);
  --good:           #0ca30c;
  --bad:            #c23b2f;
  --shadow: 0 1px 2px rgba(20,18,26,0.04), 0 8px 24px -12px rgba(20,18,26,0.14);
}
@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --surface:        #131319;
    --surface-panel:  #1b1a22;
    --ink-1:          #f2f0eb;
    --ink-2:          #bcb9c4;
    --ink-3:          #7d7a86;
    --hairline:       #2b2a33;
    --hairline-strong: rgba(242,240,235,0.16);
    --accent:         #a89bf0;
    --accent-ink:     #1c1730;
    --accent-soft:    rgba(168,155,240,0.14);
    --good:           #35c453;
    --bad:            #e8695c;
    --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 8px 28px -12px rgba(0,0,0,0.5);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --surface:        #131319;
  --surface-panel:  #1b1a22;
  --ink-1:          #f2f0eb;
  --ink-2:          #bcb9c4;
  --ink-3:          #7d7a86;
  --hairline:       #2b2a33;
  --hairline-strong: rgba(242,240,235,0.16);
  --accent:         #a89bf0;
  --accent-ink:     #1c1730;
  --accent-soft:    rgba(168,155,240,0.14);
  --good:           #35c453;
  --bad:            #e8695c;
  --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 8px 28px -12px rgba(0,0,0,0.5);
}
:root[data-theme="light"] {
  color-scheme: light;
  --surface:        #f5f3ee;
  --surface-panel:  #fdfcfa;
  --ink-1:          #16151c;
  --ink-2:          #55525f;
  --ink-3:          #8b8894;
  --hairline:       #e2ddd3;
  --hairline-strong: rgba(22,21,28,0.16);
  --accent:         #4b3f9e;
  --accent-ink:     #ffffff;
  --accent-soft:    rgba(75,63,158,0.08);
  --good:           #0ca30c;
  --bad:            #c23b2f;
  --shadow: 0 1px 2px rgba(20,18,26,0.04), 0 8px 24px -12px rgba(20,18,26,0.14);
}

* { box-sizing: border-box; }
html, body { background: var(--surface); color: var(--ink-1); margin: 0; }
body {
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", "Segoe UI", system-ui, sans-serif;
  line-height: 1.75;
}
a { color: inherit; }
.font-display { font-family: "Iowan Old Style", "Yu Mincho", "Hiragino Mincho ProN", "Noto Serif JP", serif; }
.font-mono { font-family: ui-monospace, "SF Mono", "Cascadia Code", "Consolas", monospace; font-variant-numeric: tabular-nums; }

/* ---------- shell layout ---------- */
.shell-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px clamp(16px, 6vw, 48px);
  border-bottom: 1px solid var(--hairline);
  flex-wrap: wrap;
}
.wordmark {
  font-family: "Iowan Old Style", "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: var(--ink-1);
}
.wordmark span { color: var(--accent); }
.shell-nav {
  display: flex;
  gap: clamp(14px, 3vw, 28px);
  flex-wrap: wrap;
}
.shell-nav a {
  font-size: 0.88rem;
  color: var(--ink-2);
  text-decoration: none;
  padding: 4px 2px;
  border-bottom: 2px solid transparent;
}
.shell-nav a:hover, .shell-nav a[aria-current="page"] {
  color: var(--ink-1);
  border-bottom-color: var(--accent);
}
.shell-nav a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

main {
  max-width: 880px;
  margin: 0 auto;
  padding: clamp(32px, 6vw, 64px) clamp(16px, 6vw, 0px) clamp(48px, 8vw, 88px);
}

.shell-footer {
  border-top: 1px solid var(--hairline);
  padding: 22px clamp(16px, 6vw, 48px) 30px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 0.78rem;
  color: var(--ink-3);
}
.shell-footer nav { display: flex; gap: 16px; flex-wrap: wrap; }
.shell-footer a { color: var(--ink-3); text-decoration: none; }
.shell-footer a:hover { color: var(--ink-1); text-decoration: underline; }

/* ---------- reusable pieces ---------- */
.eyebrow {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
}
h1.page-title {
  font-size: clamp(1.9rem, 4.5vw, 2.5rem);
  font-weight: 500;
  letter-spacing: 0.01em;
  text-wrap: balance;
  margin: 10px 0 14px;
}
.lede { color: var(--ink-2); font-size: 1rem; max-width: 62ch; }

.panel {
  background: var(--surface-panel);
  border: 1px solid var(--hairline);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: clamp(18px, 3vw, 28px);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 6px;
  padding: 10px 18px;
  border: 1px solid transparent;
}
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { filter: brightness(1.06); }
.btn-secondary { background: transparent; color: var(--ink-1); border-color: var(--hairline-strong); }
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}
.app-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--surface-panel);
  border: 1px solid var(--hairline);
  border-radius: 8px;
  padding: 18px 20px;
  text-decoration: none;
  color: inherit;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}
.app-card:hover { border-color: var(--accent); box-shadow: var(--shadow); }
.app-card:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.app-card-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; }
.app-card-name { font-size: 1.02rem; font-weight: 600; }
.badge {
  font-size: 0.66rem;
  letter-spacing: 0.05em;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 999px;
  white-space: nowrap;
}
.badge-free { background: var(--accent-soft); color: var(--accent); }
.app-card-desc { font-size: 0.86rem; color: var(--ink-2); }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }