body {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  margin: 0;
  background: #000;
  font-family: Arial, sans-serif;
}

.app {
  position: relative;
  width: 100%;
  height: 100%;
}

.landing {
  position: fixed;
  inset: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background:
    radial-gradient(circle at 20% 20%, rgba(46, 79, 167, 0.5), transparent 45%),
    radial-gradient(circle at 80% 10%, rgba(184, 52, 110, 0.35), transparent 40%),
    radial-gradient(circle at 30% 90%, rgba(11, 136, 124, 0.32), transparent 45%),
    rgba(4, 8, 20, 0.94);
}

.landing--hidden {
  display: none;
}

.landing-panel {
  width: min(960px, 100%);
  color: #f6f7fb;
  background: rgba(7, 13, 31, 0.74);
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 18px;
  padding: 28px;
  box-shadow: 0 26px 70px rgba(0, 0, 0, 0.35);
}

.landing-eyebrow {
  margin: 0 0 8px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 11px;
  opacity: 0.72;
}

.landing-panel h1 {
  margin: 0;
  font-size: clamp(26px, 4vw, 40px);
}

.landing-subtitle {
  margin: 10px 0 0;
  max-width: 640px;
  font-size: 14px;
  line-height: 1.45;
  opacity: 0.82;
}

.landing-options {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
}

.environment-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  gap: 8px;
  min-height: 150px;
  text-align: left;
  padding: 18px 16px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #fff;
  background: linear-gradient(
    140deg,
    rgba(44, 75, 186, 0.75),
    rgba(167, 40, 110, 0.62)
  );
  transition: transform 120ms ease, border-color 120ms ease, opacity 120ms ease;
}

.environment-card:nth-child(2) {
  background: linear-gradient(
    145deg,
    rgba(220, 108, 25, 0.78),
    rgba(159, 47, 143, 0.6)
  );
}

.environment-card:nth-child(3) {
  background: linear-gradient(
    145deg,
    rgba(196, 48, 20, 0.84),
    rgba(247, 127, 30, 0.7)
  );
}

.environment-card:nth-child(4) {
  background: linear-gradient(
    145deg,
    rgba(39, 117, 202, 0.86),
    rgba(132, 224, 255, 0.66)
  );
}

.environment-card:nth-child(5) {
  background: linear-gradient(
    145deg,
    rgba(21, 128, 181, 0.8),
    rgba(26, 174, 134, 0.62)
  );
}

.environment-card:hover {
  cursor: pointer;
  transform: translateY(-2px);
  border-color: rgba(255, 255, 255, 0.4);
}

.environment-card:disabled {
  opacity: 0.62;
  cursor: not-allowed;
}

.environment-card--placeholder {
  background: linear-gradient(
    145deg,
    rgba(80, 87, 99, 0.48),
    rgba(43, 49, 63, 0.55)
  );
}

.environment-card-title {
  font-size: 19px;
  font-weight: 700;
}

.environment-card-text {
  font-size: 13px;
  line-height: 1.45;
  opacity: 0.9;
}

.instruction {
  position: fixed;
  top: 0;
  left: 0;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  color: #fff;
  z-index: 3;
  font-size: 12px;
  background: rgba(0, 0, 0, 0.35);
  border-bottom-right-radius: 8px;
}

.instruction--hidden {
  display: none;
}

#flowers {
  display: block;
  background: #000;
}

#clearBtn,
#menuBtn,
#settingsBtn,
#musicBtn,
#environmentSelect {
  padding: 6px;
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.2);
}

#environmentSelect {
  background: rgba(0, 0, 0, 0.5);
  color: #fff;
}

#clearBtn:hover {
  cursor: pointer;
}

#menuBtn:hover {
  cursor: pointer;
}

#settingsBtn:hover {
  cursor: pointer;
}

#musicBtn:hover {
  cursor: pointer;
}

#musicHint {
  opacity: 0.9;
}

.instruction label {
  opacity: 0.85;
}

.settings-panel {
  position: fixed;
  top: 48px;
  left: 10px;
  z-index: 4;
  width: min(320px, calc(100vw - 20px));
  max-height: calc(100vh - 58px);
  overflow-y: auto;
  padding: 14px 14px 16px;
  color: #f4f7ff;
  background: rgba(10, 16, 34, 0.84);
  border: 1px solid rgba(204, 218, 255, 0.22);
  border-radius: 10px;
  box-shadow: 0 16px 30px rgba(0, 0, 0, 0.28);
  backdrop-filter: blur(8px);
}

.settings-panel--hidden {
  display: none;
}

.settings-panel__header h2 {
  margin: 0;
  font-size: 16px;
}

.settings-panel__header p {
  margin: 6px 0 12px;
  font-size: 12px;
  opacity: 0.8;
}

.settings-field {
  margin-top: 8px;
  display: flex;
  justify-content: space-between;
  font-size: 12px;
}

.settings-panel input[type='range'] {
  width: 100%;
  margin-top: 6px;
}

.settings-toggle {
  margin-top: 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: 12px;
}

.settings-panel__section h3 {
  margin: 14px 0 0;
  font-size: 13px;
}

.settings-panel__section p {
  margin: 6px 0 8px;
  font-size: 12px;
  opacity: 0.8;
}

.settings-inline {
  margin-top: 8px;
  display: grid;
  grid-template-columns: 70px 1fr;
  align-items: center;
  gap: 8px;
  font-size: 12px;
}

.settings-inline input {
  width: 100%;
  box-sizing: border-box;
  border-radius: 4px;
  border: 1px solid rgba(215, 225, 255, 0.26);
  background: rgba(0, 0, 0, 0.35);
  color: #f4f7ff;
  padding: 4px 6px;
}

.settings-reset-btn {
  margin-top: 12px;
  width: 100%;
  border-radius: 6px;
  border: 1px solid rgba(215, 225, 255, 0.26);
  background: rgba(40, 62, 111, 0.5);
  color: #f4f7ff;
  padding: 8px 10px;
}

.settings-reset-btn:hover {
  cursor: pointer;
}

@media (max-width: 900px) {
  .landing {
    align-items: flex-start;
    padding-top: 50px;
  }

  .landing-panel {
    padding: 20px;
  }

  .landing-options {
    grid-template-columns: 1fr;
  }

  .environment-card {
    min-height: 120px;
  }

  .instruction {
    flex-wrap: wrap;
    padding-right: 12px;
    max-width: calc(100vw - 22px);
  }

  .settings-panel {
    top: 92px;
  }
}