:root {
  color-scheme: dark;
  --bg: #020617;
  --panel: rgba(15, 23, 42, 0.84);
  --line: rgba(148, 163, 184, 0.16);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --brand: #38bdf8;
  --brand-2: #818cf8;
  --good: #22c55e;
  --bad: #fb7185;
  --band: rgba(56, 189, 248, 0.14);
  --guide: rgba(129, 140, 248, 0.95);
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.16), transparent 32%),
    radial-gradient(circle at top right, rgba(129, 140, 248, 0.16), transparent 28%),
    var(--bg);
  color: var(--text);
  font: 16px/1.5 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  padding: 20px;
}

button,
select,
input {
  font: inherit;
}

button,
select {
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(30, 41, 59, 0.88);
  color: var(--text);
}

button {
  cursor: pointer;
  padding: 10px 14px;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

button:hover {
  transform: translateY(-1px);
  border-color: rgba(56, 189, 248, 0.4);
}

select,
input[type="range"] {
  width: 100%;
}

select {
  padding: 10px 12px;
}

.app-shell {
  max-width: 1500px;
  margin: 0 auto;
}

.topbar,
.panel {
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 24px;
  margin-bottom: 18px;
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--brand);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: clamp(1.8rem, 3vw, 2.6rem);
}

h2 {
  font-size: 1.1rem;
  margin-bottom: 12px;
}

h3 {
  font-size: 0.98rem;
  margin-bottom: 8px;
}

.subcopy,
.helper-text,
.status-text,
dt {
  color: var(--muted);
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.timer-box,
.metric-pill {
  min-width: 110px;
  padding: 10px 14px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(15, 23, 42, 0.9);
}

.timer-box span,
.metric-pill span {
  display: block;
  color: var(--muted);
  font-size: 0.82rem;
}

.timer-box strong,
.metric-pill strong {
  display: block;
  margin-top: 4px;
  font-size: 1.05rem;
}

.layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr) 320px;
  gap: 18px;
}

.panel {
  padding: 20px;
}

.controls-panel,
.results-panel {
  display: grid;
  gap: 18px;
  align-content: start;
}

.controls-panel section,
.results-panel section {
  display: grid;
  gap: 10px;
}

.field-label {
  color: var(--muted);
  font-size: 0.88rem;
}

.button-row,
.button-column {
  display: grid;
  gap: 10px;
}

.button-row {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.ghost-btn {
  background: rgba(15, 23, 42, 0.5);
}

.hidden {
  display: none !important;
}

.stage-panel {
  display: grid;
  gap: 14px;
}

.stage-header {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: flex-start;
}

.legend {
  display: grid;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--muted);
}

.legend span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.legend i {
  width: 14px;
  height: 14px;
  border-radius: 999px;
  display: inline-block;
}

.legend-band { background: var(--band); border: 1px solid rgba(56, 189, 248, 0.3); }
.legend-guide { background: var(--guide); }
.legend-good { background: var(--good); }
.legend-bad { background: var(--bad); }

.canvas-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  border-radius: 24px;
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(15, 23, 42, 0.94), rgba(2, 6, 23, 0.9));
  overflow: hidden;
  touch-action: none;
}

.canvas-frame canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.stroke-bar {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.result-score {
  padding: 14px 16px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.14), rgba(129, 140, 248, 0.14));
  border: 1px solid rgba(56, 189, 248, 0.18);
}

.result-score span {
  display: block;
  color: var(--muted);
  font-size: 0.88rem;
}

.result-score strong {
  display: block;
  margin-top: 6px;
  font-size: 2.2rem;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
}

.result-grid div {
  padding: 12px 14px;
  border-radius: 16px;
  background: rgba(15, 23, 42, 0.75);
  border: 1px solid var(--line);
}

dd {
  margin: 6px 0 0;
  font-size: 1.05rem;
  font-weight: 700;
}

.score-note ul,
.roadmap-box ol {
  margin: 0;
  padding-left: 18px;
}

.score-note li,
.roadmap-box li {
  margin: 6px 0;
}

@media (max-width: 1180px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .stroke-bar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  body {
    padding: 12px;
  }

  .topbar,
  .stage-header {
    grid-template-columns: 1fr;
    display: grid;
  }

  .top-actions {
    width: 100%;
    flex-wrap: wrap;
  }

  .button-row,
  .result-grid,
  .stroke-bar {
    grid-template-columns: 1fr;
  }
}