:root {
  color-scheme: dark;
  --bg: #070911;
  --panel: #12182a;
  --line: #2f3c5d;
  --text: #ecf1ff;
  --muted: #9cadcf;
  --cyan: #63f2ff;
  --lime: #a7ff72;
  --amber: #ffd666;
  --danger: #ff6f91;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 15% -8%, rgba(99, 242, 255, 0.18), transparent 36%),
    radial-gradient(circle at 88% 0%, rgba(167, 255, 114, 0.14), transparent 35%),
    linear-gradient(180deg, #0d1425 0%, var(--bg) 100%);
}

.deck {
  width: min(900px, 94vw);
  margin: 1.7rem auto 2.4rem;
  display: grid;
  gap: 0.92rem;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 15px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0));
  padding: 1rem 1.1rem;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.kicker {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
}

h1 {
  margin: 0.36rem 0 0;
  font-size: clamp(1.58rem, 3.9vw, 2.3rem);
}

.subtitle {
  margin: 0.46rem 0 0;
  max-width: 64ch;
  color: var(--muted);
}

.hud {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.48rem;
}

.stat {
  border: 1px solid #394668;
  border-radius: 10px;
  padding: 0.52rem 0.62rem;
  background: rgba(11, 16, 30, 0.74);
}

.label {
  display: block;
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.value {
  display: block;
  margin-top: 0.16rem;
  font-size: 1.12rem;
  font-weight: 700;
}

.machine-panel {
  display: grid;
  gap: 0.75rem;
}

.machine-head {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.8rem;
  justify-content: space-between;
  align-items: baseline;
}

h2 {
  margin: 0;
  font-size: 1.06rem;
}

.difficulty {
  margin: 0;
  color: var(--amber);
  font-size: 0.86rem;
}

.machine {
  border: 2px solid #455577;
  border-radius: 12px;
  padding: 0.72rem;
  background: linear-gradient(180deg, #161e34 0%, #0d1324 100%);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.5rem;
}

.slot {
  border: 1px solid #405075;
  border-radius: 10px;
  height: 72px;
  display: grid;
  place-items: center;
  font-size: 1.02rem;
  font-weight: 700;
  color: #c6d3f4;
  background: rgba(12, 17, 29, 0.82);
  position: relative;
  transition: border-color 140ms ease, transform 100ms ease, box-shadow 140ms ease;
}

.slot::after {
  content: "";
  position: absolute;
  inset: auto 12% 12px;
  height: 9px;
  border-radius: 6px;
  background: #1d263f;
}

.slot.target {
  border-color: #65ecff;
  box-shadow: 0 0 14px rgba(101, 236, 255, 0.32);
}

.slot.success {
  border-color: #8eff80;
  box-shadow: 0 0 14px rgba(142, 255, 128, 0.35);
  transform: translateY(3px);
}

.slot.fail {
  border-color: #ff7f9d;
  box-shadow: 0 0 14px rgba(255, 127, 157, 0.35);
}

.meter-wrap {
  display: grid;
  gap: 0.28rem;
}

.meter-wrap label {
  font-size: 0.8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.meter {
  height: 16px;
  border-radius: 999px;
  border: 1px solid #3a4868;
  background: #151b2d;
  overflow: hidden;
  position: relative;
}

.fill {
  height: 100%;
  width: 0%;
  transition: width 100ms linear;
}

.fill.release {
  background: linear-gradient(90deg, #5de8ff, #a7ff72);
}

.fill.tilt {
  background: linear-gradient(90deg, #ffcb64, #ff6f91);
}

.target-mark {
  position: absolute;
  top: -3px;
  bottom: -3px;
  width: 3px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.92);
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.7);
}

.status {
  margin: 0;
  min-height: 1.3rem;
  color: #d6dfff;
}

.status.ok {
  color: var(--lime);
}

.status.bad {
  color: var(--danger);
}

.buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.52rem;
}

button {
  border-radius: 10px;
  border: 1px solid #3f4d70;
  background: #141c31;
  color: var(--text);
  font: inherit;
  padding: 0.56rem 0.9rem;
  cursor: pointer;
  transition: filter 110ms ease, transform 90ms ease;
}

button:enabled:hover {
  filter: brightness(1.08);
}

button:enabled:active {
  transform: translateY(1px);
}

button:disabled {
  opacity: 0.52;
  cursor: not-allowed;
}

button.primary {
  border-color: #10a7b8;
  color: #032129;
  font-weight: 700;
  background: linear-gradient(180deg, #5ff0ff, #1494a9);
}

.controls-note {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.notes ul {
  margin: 0.54rem 0 0;
  padding-left: 1.1rem;
  display: grid;
  gap: 0.3rem;
}

.back-link {
  display: inline-block;
  margin-top: 0.8rem;
  color: #91f7ff;
  text-decoration: none;
}

.back-link:hover {
  text-decoration: underline;
}

@media (max-width: 760px) {
  .hud {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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