:root {
  --bg: #120e0a;
  --bg-2: #1c1510;
  --panel: #241b14;
  --ink: #f6e8d7;
  --muted: #b89a7c;
  --accent: #f4a261;
  --accent-2: #e76f51;
  --good: #2a9d8f;
  --warn: #e9c46a;
  --bad: #e76f51;
  --nap: #7b6bb5;
  --demo: #4cc9f0;
  --live: #f4a261;
  --line: #3a2c22;
  --hit: #ffe8c2;
  --focus: #ffd166;
  --radius: 16px;
  --font: "Segoe UI", system-ui, -apple-system, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 50% -10%, #3a2418 0%, transparent 55%),
    radial-gradient(800px 400px at 100% 100%, #2a1a3a 0%, transparent 45%),
    var(--bg);
  min-height: 100dvh;
  line-height: 1.45;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #120e0a;
  padding: 0.5rem 1rem;
  z-index: 1000;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

.app {
  width: min(960px, 100%);
  margin: 0 auto;
  padding: 0.75rem 1rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-height: 100dvh;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand { display: flex; gap: 0.75rem; align-items: center; }
.logo { font-size: 1.75rem; }
.brand h1 {
  margin: 0;
  font-size: clamp(1.25rem, 3vw, 1.6rem);
  letter-spacing: 0.02em;
}
.tagline { margin: 0; color: var(--muted); font-size: 0.85rem; }
.top-actions { display: flex; gap: 0.4rem; align-items: center; }

.icon-btn, .ghost-btn, .primary-btn, .secondary-btn {
  font: inherit;
  cursor: pointer;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  padding: 0.45rem 0.9rem;
  transition: transform 0.12s ease, background 0.12s ease, border-color 0.12s ease;
}
.icon-btn { width: 2.4rem; height: 2.4rem; padding: 0; display: grid; place-items: center; }
.primary-btn {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #1a1008;
  border: none;
  font-weight: 700;
}
.secondary-btn { background: #32251c; }
.ghost-btn { background: transparent; }
.icon-btn:hover, .ghost-btn:hover, .primary-btn:hover, .secondary-btn:hover {
  transform: translateY(-1px);
  border-color: var(--accent);
}
.icon-btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; }
:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
}

.hud {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.5rem;
}
.hud-card, .tel-item {
  background: color-mix(in srgb, var(--panel) 88%, black);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.55rem 0.7rem;
}
.hud-card .label, .tel-item > span {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.hud-card strong, .tel-item strong {
  font-size: 1.1rem;
  font-variant-numeric: tabular-nums;
}
.mode-card strong.live { color: var(--live); }
.mode-card strong.nap { color: var(--nap); }
.mode-card strong.demo { color: var(--demo); }

.telemetry {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.4rem;
  font-size: 0.9rem;
}
.tel-item.network strong { font-size: 0.95rem; }

.stage {
  position: relative;
  flex: 1;
  min-height: 360px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, #1a120c 0%, #0d0a08 100%);
  box-shadow: 0 20px 60px rgba(0,0,0,0.35), inset 0 0 80px rgba(244,162,97,0.05);
}
.stage:focus { outline: none; }
.stage:focus-visible { box-shadow: 0 0 0 2px var(--focus), 0 20px 60px rgba(0,0,0,0.35); }
#game {
  width: 100%;
  height: 100%;
  display: block;
  touch-action: manipulation;
}
.hit-flash {
  pointer-events: none;
  position: absolute;
  inset: 0;
  opacity: 0;
  background: radial-gradient(circle at 50% 78%, rgba(244,162,97,0.35), transparent 45%);
  transition: opacity 0.12s ease;
}
.hit-flash.on { opacity: 1; }
.judgement {
  position: absolute;
  left: 50%;
  top: 42%;
  transform: translate(-50%, -50%);
  font-weight: 800;
  font-size: clamp(1.2rem, 4vw, 1.8rem);
  letter-spacing: 0.08em;
  text-shadow: 0 2px 12px rgba(0,0,0,0.6);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
}
.judgement.show { opacity: 1; transform: translate(-50%, -70%); }
.judgement.perfect { color: var(--good); }
.judgement.good { color: var(--warn); }
.judgement.miss { color: var(--bad); }

.tap-zone {
  position: absolute;
  left: 50%;
  bottom: 1rem;
  transform: translateX(-50%);
  min-width: 7.5rem;
  min-height: 3.2rem;
  border-radius: 999px;
  border: none;
  font: inherit;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: #1a1008;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 10px 30px rgba(231,111,81,0.35);
  cursor: pointer;
  touch-action: manipulation;
  display: none;
}
@media (pointer: coarse) {
  .tap-zone { display: inline-flex; align-items: center; justify-content: center; }
}

.footer {
  color: var(--muted);
  font-size: 0.78rem;
  text-align: center;
}
.footer p { margin: 0.2rem 0; }
.footer a, .panel a { color: var(--accent); }
.links { word-break: break-word; }

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(8,6,4,0.72);
  backdrop-filter: blur(6px);
  display: grid;
  place-items: center;
  padding: 1rem;
  z-index: 50;
}
.overlay[hidden] { display: none !important; }
.panel {
  width: min(420px, 100%);
  background: linear-gradient(180deg, #2a2018, #1a140f);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 1.35rem 1.25rem 1.2rem;
  box-shadow: 0 30px 80px rgba(0,0,0,0.45);
}
.panel.wide { width: min(560px, 100%); }
.panel h2 { margin: 0 0 0.6rem; }
.lead { color: var(--muted); margin-top: 0; }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1rem; }
.bests {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  background: #18120d;
  border-radius: 12px;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--line);
}
.hint { color: var(--muted); font-size: 0.85rem; }
kbd {
  font-family: var(--mono);
  background: #120e0a;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.05rem 0.35rem;
}
.panel ol { padding-left: 1.2rem; color: var(--muted); }
.panel ol li { margin: 0.35rem 0; }
.end-score { font-size: 1.05rem; }

@media (max-width: 720px) {
  .hud { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .telemetry { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tel-item.network { grid-column: 1 / -1; }
  .tagline { display: none; }
  .stage { min-height: 420px; }
}
@media (max-width: 390px) {
  .app { padding: 0.5rem 0.6rem 1rem; }
  .brand h1 { font-size: 1.15rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
  .judgement.show { transform: translate(-50%, -50%); }
}