:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --border: #2a2d3a;
  --text: #e0e0e6;
  --text-dim: #8888a0;
  --accent: #5b8def;
  --green: #4ec88c;
  --yellow: #e8b84a;
  --red: #e85454;
  --orange: #e8944a;
  --font: "JetBrains Mono", "Fira Code", "Cascadia Code", monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

header {
  text-align: center;
  padding: 2rem 1rem 1rem;
}

header h1 {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.subtitle {
  color: var(--text-dim);
  font-size: 0.85rem;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1rem 4rem;
}

footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-dim);
  font-size: 0.75rem;
}

footer a {
  color: var(--accent);
  text-decoration: none;
}

.hidden { display: none !important; }

/* Drop zone */
.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 12px;
  padding: 4rem 2rem;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(91, 141, 239, 0.05);
}

.drop-icon { font-size: 3rem; margin-bottom: 1rem; }

.drop-zone code {
  background: var(--surface);
  padding: 0.15em 0.4em;
  border-radius: 4px;
  font-size: 0.9em;
}

.hint { color: var(--text-dim); font-size: 0.8rem; margin-top: 0.5rem; }

.drop-zone input[type="file"] {
  position: absolute;
  width: 0;
  height: 0;
  opacity: 0;
}

/* Loading */
.loading {
  text-align: center;
  padding: 4rem;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  margin: 0 auto 1rem;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* Session tabs */
.session-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  overflow-x: auto;
}

.session-tab {
  padding: 0.5rem 1rem;
  border-radius: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.85rem;
  white-space: nowrap;
  transition: all 0.15s;
}

.session-tab:hover { border-color: var(--accent); color: var(--text); }
.session-tab.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* Panels */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.panel h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text);
}

/* Summary grid */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
}

.summary-card {
  background: var(--bg);
  border-radius: 8px;
  padding: 1rem;
}

.summary-card .label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  margin-bottom: 0.25rem;
}

.summary-card .value {
  font-size: 1.3rem;
  font-weight: 700;
}

/* Diagnostics */
.diagnostic {
  padding: 0.75rem 1rem;
  border-radius: 6px;
  margin-bottom: 0.5rem;
  border-left: 3px solid;
}

.diagnostic.Problem { border-color: var(--red); background: rgba(232, 84, 84, 0.08); }
.diagnostic.Warning { border-color: var(--yellow); background: rgba(232, 184, 74, 0.08); }
.diagnostic.Info { border-color: var(--accent); background: rgba(91, 141, 239, 0.08); }

.diagnostic .diag-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.25rem;
}

.diagnostic .severity {
  font-size: 0.7rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.diagnostic.Problem .severity { color: var(--red); }
.diagnostic.Warning .severity { color: var(--yellow); }
.diagnostic.Info .severity { color: var(--accent); }

.diagnostic .category {
  font-size: 0.7rem;
  color: var(--text-dim);
}

.diagnostic .message { font-size: 0.85rem; font-weight: 600; }
.diagnostic .detail { font-size: 0.8rem; color: var(--text-dim); margin-top: 0.25rem; }

/* Spectrum plots */
.spectrum-row {
  margin-bottom: 1.5rem;
}

.spectrum-row h3 {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-dim);
}

.peaks-list {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 0.75rem;
}

.peak-badge {
  background: var(--bg);
  border-radius: 6px;
  padding: 0.3rem 0.6rem;
  font-size: 0.75rem;
}

.peak-badge .freq { font-weight: 700; color: var(--accent); }
.peak-badge .class { color: var(--orange); margin-left: 0.3rem; }

/* Throttle bands */
.throttle-band {
  margin-bottom: 1.5rem;
}

.throttle-band h3 {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.band-meta {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

/* Accel */
.accel-rms {
  display: flex;
  gap: 1rem;
  margin-bottom: 1rem;
}

.rms-card {
  background: var(--bg);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  flex: 1;
  text-align: center;
}

.rms-card .axis { font-size: 0.7rem; color: var(--text-dim); text-transform: uppercase; }
.rms-card .rms-value { font-size: 1.2rem; font-weight: 700; }

/* Events */
.event-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

.event-table th {
  text-align: left;
  padding: 0.5rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-dim);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.event-table td {
  padding: 0.4rem 0.5rem;
  border-bottom: 1px solid rgba(42, 45, 58, 0.5);
}

.event-type {
  font-weight: 600;
  white-space: nowrap;
}

.event-type.ThrottleChop { color: var(--red); }
.event-type.ThrottlePunch { color: var(--green); }
.event-type.MotorSaturation { color: var(--yellow); }
.event-type.GyroSpike { color: var(--orange); }
.event-type.Overshoot { color: var(--accent); }
.event-type.Desync { color: var(--red); }

.events-truncated {
  color: var(--text-dim);
  font-size: 0.8rem;
  margin-top: 0.75rem;
  font-style: italic;
}

/* Reset button */
.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  gap: 1rem;
}

.reset-btn {
  padding: 0.5rem 1rem;
  border-radius: 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-dim);
  cursor: pointer;
  font-family: var(--font);
  font-size: 0.8rem;
  white-space: nowrap;
  transition: all 0.15s;
}

.reset-btn:hover { border-color: var(--accent); color: var(--text); }

/* Chart sizing */
.u-wrap { margin: 0 auto; }

/* Responsive */
@media (max-width: 640px) {
  header { padding: 1.5rem 0.5rem 0.75rem; }
  header h1 { font-size: 1.4rem; }
  main { padding: 0 0.5rem 3rem; }

  .drop-zone { padding: 3rem 1rem; }
  .drop-icon { font-size: 2rem; }

  .summary-grid { grid-template-columns: repeat(2, 1fr); gap: 0.5rem; }
  .summary-card .value { font-size: 1.1rem; }

  .panel { padding: 1rem; }

  .results-header { flex-direction: column; align-items: stretch; }
  .session-tabs { justify-content: center; }
  .reset-btn { text-align: center; }

  .accel-rms { flex-direction: column; }

  .event-table { font-size: 0.7rem; }
  .event-table th, .event-table td { padding: 0.3rem; }
}