:root {
  --bg: #2b2f36;
  --surface: #353a43;
  --text: #eef0f3;
  --muted: #a3aab5;
  --accent: #7cc4a4;
  --accent-text: #10241b;
  --radius: 14px;
  color-scheme: dark;
}

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

html { background: var(--bg); }

body {
  margin: 0;
  color: var(--text);
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: max(24px, env(safe-area-inset-top)) 16px max(40px, env(safe-area-inset-bottom));
}

nav { display: flex; gap: 16px; margin-bottom: 32px; font-size: 0.95rem; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover, nav a[aria-current='page'] { color: var(--text); }

h1 { font-size: 2rem; font-weight: 650; line-height: 1.2; margin: 0 0 12px; letter-spacing: 0.01em; }
h2 { font-size: 1.2rem; font-weight: 650; margin: 36px 0 8px; }
p, ul { margin: 0 0 14px; }
ul { padding-left: 1.25em; }
li { margin-bottom: 6px; }
a { color: var(--accent); }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

.lead { font-size: 1.15rem; color: var(--muted); }
.meta { color: var(--muted); font-size: 0.9rem; }

.play {
  display: inline-block;
  margin: 12px 0 8px;
  padding: 12px 28px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 650;
  text-decoration: none;
}

.panel { background: var(--surface); border-radius: var(--radius); padding: 16px 20px; margin: 24px 0; }
.panel p:last-child, .panel ul:last-child { margin-bottom: 0; }

footer { margin-top: 48px; color: var(--muted); font-size: 0.9rem; }
footer a { color: var(--muted); }

.puzzles { list-style: none; padding: 0; margin: 16px 0 24px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px 12px; align-items: start; }
@media (min-width: 560px) { .puzzles { grid-template-columns: repeat(3, 1fr); } }
.puzzles li { margin: 0; }
.puzzles a { display: block; color: var(--text); text-decoration: none; font-weight: 600; font-size: 0.95rem; line-height: 1.3; }
.puzzles img { display: block; width: 100%; height: auto; margin-bottom: 6px; border-radius: 10px; background: var(--surface); }
.puzzles .credit { margin: 4px 0 0; color: var(--muted); font-size: 0.8rem; line-height: 1.4; }
.puzzles .credit a { display: inline; color: var(--muted); font-weight: 400; font-size: inherit; text-decoration: underline; }