:root {
  color-scheme: dark;
  --text: #f5f7fb;
  --muted: #b9c3d6;
  --panel: rgba(8, 13, 24, 0.68);
  --panel-strong: rgba(15, 23, 42, 0.86);
  --line: rgba(255, 255, 255, 0.18);
  --orange: #ffb703;
  --cyan: #47d7ff;
  --green: #8ee66b;
  --red: #ff6b6b;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  overflow-x: hidden;
  background:
    radial-gradient(circle at 18% 18%, rgba(71, 215, 255, 0.22), transparent 28rem),
    radial-gradient(circle at 85% 80%, rgba(255, 183, 3, 0.2), transparent 30rem),
    linear-gradient(135deg, #09111f 0%, #111827 42%, #251426 100%);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

#physicsCanvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
}

.shell {
  position: relative;
  z-index: 1;
  display: grid;
  min-height: 100vh;
  padding: clamp(1rem, 3vw, 3rem);
  place-items: center;
}

.countdown-panel {
  width: min(100%, 66rem);
  padding: clamp(1.25rem, 4vw, 3rem);
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.08), transparent 40%),
    var(--panel);
  box-shadow: 0 2rem 5rem rgba(0, 0, 0, 0.34);
  backdrop-filter: blur(18px) saturate(130%);
}

.title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.kicker,
.target-chip,
.status,
label {
  color: var(--muted);
  font-size: 0.9rem;
}

.kicker {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.target-chip {
  max-width: 100%;
  padding: 0.45rem 0.7rem;
  border: 1px solid rgba(71, 215, 255, 0.36);
  border-radius: 999px;
  background: rgba(5, 9, 16, 0.48);
  white-space: nowrap;
}

h1 {
  max-width: 12ch;
  margin: 0 0 clamp(1.25rem, 4vw, 2.5rem);
  font-size: clamp(2.6rem, 8vw, 6.8rem);
  line-height: 0.95;
  letter-spacing: 0;
}

.countdown-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(0.65rem, 2vw, 1rem);
}

.time-card {
  display: grid;
  min-height: clamp(7.5rem, 16vw, 12rem);
  padding: clamp(0.8rem, 2vw, 1.25rem);
  border: 1px solid rgba(255, 255, 255, 0.17);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.03)),
    var(--panel-strong);
  place-items: center;
  text-align: center;
}

.time-value {
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.2rem, 7.5vw, 6rem);
  font-weight: 800;
  line-height: 1;
  text-shadow: 0 0 2rem rgba(71, 215, 255, 0.25);
}

.time-label {
  color: var(--muted);
  font-size: clamp(0.78rem, 1.5vw, 1rem);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.target-form {
  display: grid;
  gap: 0.55rem;
  margin-top: clamp(1rem, 3vw, 1.5rem);
}

.input-row {
  display: flex;
  gap: 0.6rem;
}

input,
button {
  min-height: 2.85rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
}

input {
  width: 100%;
  min-width: 0;
  padding: 0 0.8rem;
  background: rgba(4, 8, 15, 0.68);
  color: var(--text);
}

button {
  flex: 0 0 auto;
  padding: 0 1rem;
  background: linear-gradient(135deg, var(--orange), #ff7a45);
  color: #12100a;
  cursor: pointer;
  font-weight: 800;
}

button:hover {
  filter: brightness(1.06);
}

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

.status {
  min-height: 1.4rem;
  margin: 1rem 0 0;
}

.is-finished .time-value {
  color: var(--green);
}

@media (max-width: 760px) {
  .shell {
    align-items: stretch;
    padding: 1rem;
  }

  .countdown-panel {
    align-self: center;
  }

  .title-row,
  .input-row {
    align-items: stretch;
    flex-direction: column;
  }

  .target-chip {
    width: fit-content;
    white-space: normal;
  }

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

@media (max-width: 420px) {
  .countdown-grid {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 2.55rem;
  }
}