:root {
  color-scheme: dark;
  --bg: #0b0d12;
  --surface: #141820;
  --surface-2: #1c2230;
  --line: #2c3444;
  --text: #e9edf3;
  --muted: #9aa6b6;
  --accent: #4d9bff;
  --x: #e0a040;
  --easy: #2fbf71;
  --medium: #f0a830;
  --hard: #e5534b;
  --radius: 12px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: radial-gradient(1200px 600px at 50% -200px, #1a2333, var(--bg)) no-repeat, var(--bg);
  color: var(--text);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", "Hiragino Sans", "Yu Gothic UI", "Meiryo", sans-serif;
}

a { color: var(--accent); }

button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}
button:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.page { max-width: 760px; margin: 0 auto; padding: 20px 16px 48px; }

.lang { display: flex; justify-content: flex-end; gap: 4px; }
.lang button {
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
}
.lang button[aria-pressed="true"] { border-color: var(--accent); color: var(--text); }

.hero { margin: 24px 0 28px; }
.kicker { margin: 0; color: var(--accent); font-weight: 700; letter-spacing: .04em; }
.hero h1 { margin: 6px 0 12px; font-size: clamp(30px, 6vw, 44px); line-height: 1.15; }
.lead { margin: 0; color: var(--muted); }

/* Test panel */
.abx {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 20px 60px rgba(0, 0, 0, .35);
}

.levels { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.level {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
  text-align: left;
}
.level.easy { --tone: var(--easy); }
.level.medium { --tone: var(--medium); }
.level.hard { --tone: var(--hard); }
.level:hover { border-color: var(--tone); }
.level[aria-selected="true"] { border-color: var(--tone); background: color-mix(in srgb, var(--tone) 16%, var(--surface-2)); }
.level-head { display: flex; align-items: center; gap: 10px; }
.level-name { font-weight: 800; font-size: 18px; color: var(--tone); }
/* Difficulty meter: one to three filled bars, rising in height */
.meter { display: inline-flex; align-items: flex-end; gap: 3px; height: 16px; }
.meter i { width: 5px; border-radius: 1px; background: var(--line); }
.meter i:nth-child(1) { height: 6px; }
.meter i:nth-child(2) { height: 11px; }
.meter i:nth-child(3) { height: 16px; }
.level.easy .meter i:nth-child(-n+1),
.level.medium .meter i:nth-child(-n+2),
.level.hard .meter i:nth-child(-n+3) { background: var(--tone); }
.level-what { color: var(--text); font-size: 14px; line-height: 1.35; }
.level-best { color: var(--muted); font-size: 13px; min-height: 1.2em; }

.status { margin: 16px 0 0; color: var(--muted); }

.player { margin-top: 8px; }
.question { margin: 0 0 16px; font-size: 20px; font-weight: 700; }

.switches { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.switch {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 14px 8px 10px;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
}
.switch span { font-size: 36px; font-weight: 900; line-height: 1; }
.switch small { margin-top: 6px; color: var(--muted); font-size: 13px; }
.switch.x { border-color: color-mix(in srgb, var(--x) 55%, var(--line)); }
.switch:hover { border-color: var(--accent); }
.switch.is-active { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 28%, var(--surface-2)); }
.switch.x.is-active { border-color: var(--x); background: color-mix(in srgb, var(--x) 28%, var(--surface-2)); }

.transport { display: flex; align-items: center; gap: 12px; margin: 16px 0; }
.playstop {
  min-width: 88px;
  min-height: 44px;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-2);
  font-weight: 700;
}
.playstop.is-playing { border-color: var(--accent); }
.transport input { flex: 1; min-width: 0; accent-color: var(--accent); }

.votes { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.vote {
  min-height: 52px;
  border: 0;
  border-radius: var(--radius);
  background: var(--accent);
  color: #fff;
  font-size: 18px;
  font-weight: 800;
}
.vote:hover { filter: brightness(1.12); }

.trials { display: flex; flex-wrap: wrap; gap: 6px; margin: 18px 0 0; }
.trials span { width: 12px; height: 12px; border-radius: 50%; background: var(--line); }
.trials span.done { background: var(--muted); }
.trials span.current { box-shadow: 0 0 0 2px var(--accent); background: transparent; }
.progress { margin: 8px 0 0; color: var(--muted); font-size: 14px; }
.keys { margin: 4px 0 0; color: var(--muted); font-size: 13px; }

.result { margin-top: 12px; }
.score { margin: 0 0 4px; font-size: 40px; font-weight: 900; line-height: 1.2; }
.score.is-significant { color: var(--easy); }
.verdict { margin-top: 0; }
.again {
  min-height: 44px;
  padding: 8px 22px;
  border: 0;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
}
.effetune-box {
  margin-top: 20px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface-2);
}
.open-effetune {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 22px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
}
.open-note { margin: 8px 0 0; color: var(--muted); font-size: 13px; }

/* Text sections */
.notes h2 { margin: 36px 0 8px; font-size: 22px; }
.notes ul { padding-left: 1.2em; }
.notes li { margin: 6px 0; }
.notes p, .notes li { color: #cdd5e0; }

.foot {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 560px) {
  .abx { padding: 14px; }
  .levels { grid-template-columns: 1fr; }
  .level { flex-direction: row; flex-wrap: wrap; align-items: baseline; column-gap: 10px; }
  .level-best { margin-left: auto; }
  .keys { display: none; }
}