:root {
  --bg: #090f1a;
  --surface: rgba(18, 23, 36, 0.76);
  --border: rgba(151, 172, 216, 0.2);
  --text: #f2f7ff;
  --muted: #9aa8c7;
  --pleasant: #3dbf70;
  --moderate: #e6a23c;
  --harmful: #f45b69;
  --accent: #5bb3ff;
  --radius: 18px;
}

*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(70vw 60vh at 10% 10%, rgba(91, 179, 255, 0.12), transparent 60%),
    radial-gradient(80vw 70vh at 100% 100%, rgba(126, 97, 255, 0.14), transparent 62%),
    var(--bg);
}

#app {
  position: relative;
  min-height: 100vh;
  padding: 20px;
  overflow: hidden;
}

.theme--light {
  --bg: #edf2ff;
  --surface: rgba(255, 255, 255, 0.74);
  --border: rgba(59, 86, 142, 0.18);
  --text: #172039;
  --muted: #4f5f84;
  --accent: #2f83ff;
}

.glass {
  background: var(--surface);
  border: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.24);
}

.bg-orb {
  position: absolute;
  border-radius: 999px;
  filter: blur(38px);
  opacity: 0.28;
  pointer-events: none;
  animation: floatOrb 9s ease-in-out infinite;
}

.bg-orb--one {
  width: 250px;
  height: 250px;
  top: 6%;
  left: 5%;
  background: #64beff;
}

.bg-orb--two {
  width: 280px;
  height: 280px;
  right: 2%;
  bottom: 8%;
  background: #8d6dff;
  animation-delay: -3s;
}

.topbar {
  position: relative;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 18px;
}

.topbar h1 {
  margin: 0;
  font-size: clamp(1rem, 2vw, 1.3rem);
}

.topbar-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.dashboard {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(300px, 420px) minmax(320px, 1fr);
  gap: 18px;
  align-items: start;
}

.card {
  border-radius: var(--radius);
  padding: 18px;
}

.subtitle {
  margin: 0;
  color: var(--muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.status {
  margin: 8px 0 12px;
  font-size: 1.05rem;
  font-weight: 600;
}

.gauge-wrap {
  position: relative;
  display: grid;
  place-items: center;
  margin: 8px 0 4px;
}

.gauge {
  width: min(74vw, 250px);
  height: min(74vw, 250px);
  transform: rotate(-90deg);
}

.gauge-track,
.gauge-progress {
  fill: none;
  stroke-width: 16;
}

.gauge-track { stroke: rgba(255, 255, 255, 0.1); }

.gauge-progress {
  stroke: var(--accent);
  stroke-linecap: round;
  transition: stroke 0.25s ease;
}

.readout {
  position: absolute;
  display: flex;
  align-items: baseline;
  gap: 4px;
  pointer-events: none;
}

.db-value {
  font-size: clamp(2.8rem, 10vw, 4.8rem);
  font-weight: 800;
  letter-spacing: -0.04em;
}

.db-unit {
  font-size: 1.2rem;
  color: var(--muted);
}

.insight, .classification, .meta, .error, .warning {
  margin: 8px 0 0;
  font-size: 0.92rem;
}

.classification, .meta { color: var(--muted); }

.warning {
  color: #ffd9ba;
  background: rgba(244, 91, 105, 0.16);
  border: 1px solid rgba(244, 91, 105, 0.4);
  border-radius: 10px;
  padding: 8px 10px;
  animation: pulseWarning 1.2s ease-in-out infinite;
}

.error { color: var(--harmful); }

.actions {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.btn {
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 10px 14px;
  cursor: pointer;
  font: inherit;
  color: var(--text);
  transition: transform 0.16s ease, filter 0.2s ease;
}

.btn:hover { transform: translateY(-1px); }

.btn--primary {
  background: linear-gradient(135deg, #4f9eff, #77c7ff);
  color: #fff;
}

.btn--secondary {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--border);
}

.btn--ghost {
  background: transparent;
  border-color: var(--border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(120px, 1fr));
  gap: 10px;
  margin-bottom: 12px;
}

.stat {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.03);
}

.stat span {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
}

.stat strong {
  font-size: 1.18rem;
  font-variant-numeric: tabular-nums;
}

.chart-wrap {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.02);
  margin-top: 10px;
}

.settings-wrap {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.02);
  margin-top: 10px;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(140px, 1fr));
  gap: 10px;
}

.field {
  display: grid;
  gap: 6px;
}

.field span {
  font-size: 0.78rem;
  color: var(--muted);
}

.field input {
  width: 100%;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  font: inherit;
}

.field input:focus {
  outline: 2px solid rgba(91, 179, 255, 0.45);
  outline-offset: 1px;
}

.chart-header {
  font-size: 0.8rem;
  margin-bottom: 8px;
  color: var(--muted);
}

.chart {
  width: 100%;
  height: 145px;
  display: block;
  border-radius: 10px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.01));
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.zone--pleasant .status, .zone--pleasant .db-value { color: var(--pleasant); }
.zone--moderate .status, .zone--moderate .db-value { color: var(--moderate); }
.zone--harmful .status, .zone--harmful .db-value { color: var(--harmful); }
.zone--pleasant .gauge-progress { stroke: var(--pleasant); }
.zone--moderate .gauge-progress { stroke: var(--moderate); }
.zone--harmful .gauge-progress { stroke: var(--harmful); }

@keyframes floatOrb {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-16px); }
}

@keyframes pulseWarning {
  0%, 100% { box-shadow: 0 0 0 0 rgba(244, 91, 105, 0.25); }
  50% { box-shadow: 0 0 0 8px rgba(244, 91, 105, 0.03); }
}

@media (max-width: 980px) {
  .dashboard {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  #app { padding: 12px; }
  .topbar { padding: 10px 12px; }
  .card { padding: 14px; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .settings-grid { grid-template-columns: 1fr; }
}