:root {
  --shaft: #0a0b0e;
  --well: #12141a;
  --wall: #1b1e27;
  --ink: #ece7db;
  --mute: #8a8694;
  --faint: #5c5866;
  --led: #f0c14b;
  --pad: #22262f;
  --pad-hi: #2c313c;
  --pad-press: #191c24;
  --line: rgba(255, 255, 255, 0.08);
  --accent-ink: #1a1406;
  --space: 8px;
  --radius-btn: 14px;
  --radius-well: 18px;
  --font: "PingFang TC", "Noto Sans TC", "SF Pro Text", "SF Pro Display", -apple-system,
    BlinkMacSystemFont, sans-serif;
  --mono: "SF Mono", ui-monospace, Menlo, monospace;
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--shaft);
  color: var(--ink);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  touch-action: none;
  overscroll-behavior: none;
}

body {
  position: fixed;
  inset: 0;
}

.app {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  min-height: 100svh;
  padding-top: env(safe-area-inset-top);
  padding-right: env(safe-area-inset-right);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left);
  background:
    radial-gradient(120% 80% at 50% -10%, #161820 0%, transparent 55%),
    var(--shaft);
}

.hud {
  display: grid;
  grid-template-columns: 1fr 1fr auto auto;
  gap: var(--space);
  align-items: end;
  padding: 12px 16px 8px;
}

.stat-label {
  display: block;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: none;
  color: var(--mute);
}

.stat-value {
  display: block;
  margin-top: 2px;
  font-family: var(--mono);
  font-size: 28px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.04em;
  color: var(--led);
  line-height: 1;
}

.next-wrap {
  min-width: 72px;
  text-align: right;
}

.next-wrap canvas {
  display: block;
  margin-left: auto;
  width: 56px;
  height: 56px;
}

.icon-btn {
  align-self: stretch;
  min-width: 48px;
  min-height: 44px;
  margin-left: 4px;
  border: 0;
  border-radius: 12px;
  background: var(--pad);
  color: var(--ink);
  font: inherit;
  font-size: 13px;
  font-weight: 600;
}

.icon-btn:active {
  transform: scale(0.97);
  background: var(--pad-press);
}

.stage {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
  padding: 0 16px;
}

.well-frame {
  position: relative;
  width: fit-content;
  height: fit-content;
  max-width: 100%;
  padding: 10px;
  border-radius: var(--radius-well);
  background: var(--wall);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.04),
    0 18px 40px rgba(0, 0, 0, 0.35);
}

.well-frame canvas {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: 10px;
  background: var(--well);
}

.overlay {
  position: absolute;
  inset: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
  border-radius: calc(var(--radius-well) - 4px);
  background: rgba(10, 11, 14, 0.78);
  backdrop-filter: blur(10px);
}

.overlay[hidden] {
  display: none;
}

.overlay-kicker {
  margin: 0 0 8px;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--mute);
}

.overlay-title {
  margin: 0;
  font-size: 34px;
  font-weight: 650;
  letter-spacing: -0.04em;
  text-wrap: balance;
}

.overlay-body {
  margin: 10px 0 0;
  max-width: 16rem;
  font-size: 15px;
  line-height: 1.45;
  color: var(--mute);
  text-wrap: pretty;
}

.install-hint {
  margin: 16px 0 0;
  max-width: 18rem;
  font-size: 12px;
  line-height: 1.5;
  color: var(--faint);
}

.primary-btn {
  margin-top: 22px;
  min-height: 48px;
  min-width: 148px;
  padding: 0 22px;
  border: 0;
  border-radius: 999px;
  background: var(--led);
  color: var(--accent-ink);
  font: inherit;
  font-size: 16px;
  font-weight: 650;
}

.primary-btn:active {
  transform: scale(0.97);
}

.pad {
  padding: 10px 16px 12px;
}

.pad-row {
  display: grid;
  gap: 10px;
  margin-top: 10px;
}

.pad-row:first-child {
  grid-template-columns: 1fr 1fr;
  margin-top: 0;
}

.pad-row:last-child {
  grid-template-columns: 1fr 1fr 1fr;
}

.pad-btn {
  min-height: 56px;
  border: 0;
  border-radius: var(--radius-btn);
  background: var(--pad);
  color: var(--ink);
  font: inherit;
  font-size: 17px;
  font-weight: 650;
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.05),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.pad-btn:active,
.pad-btn.is-held {
  transform: scale(0.97);
  background: var(--pad-press);
}

.pad-btn-accent {
  background: #3a2d12;
  color: var(--led);
}

@media (min-height: 780px) {
  .pad-btn {
    min-height: 64px;
  }
}

@media (min-width: 720px) {
  .app {
    max-width: 430px;
    margin: 0 auto;
    box-shadow: 0 0 0 1px var(--line);
  }
}