:root {
  --bg: #0f172a; /* slate-900 */
  --card: #111827; /* gray-900 */
  --muted: #94a3b8; /* slate-400 */
  --text: #f8fafc; /* slate-50 */
  --accent: #34d399; /* emerald-400 */
  --accent-2: #60a5fa; /* blue-400 */
  --accent-3: #f472b6; /* pink-400 */
  --accent-4: #f59e0b; /* amber-500 */
  --accent-5: #22d3ee; /* cyan-400 */
}

* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto,
    Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 600px at 0% 0%, #0b1226 0%, var(--bg) 60%);
}

.app-header {
  padding: 24px 16px 12px;
  text-align: center;
}
.app-header h1 {
  margin: 0 0 4px;
  font-size: clamp(22px, 3vw, 34px);
}
.tag {
  color: var(--muted);
  margin: 0;
}

.container {
  width: min(1200px, 96vw);
  margin: 0 auto 64px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.card {
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.03),
    rgba(255, 255, 255, 0.01)
  );
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}
.card h2 {
  margin: 0 0 12px;
}

.file-picker {
  display: flex;
  gap: 8px;
  align-items: center;
}
.file-picker input[type="file"] {
  padding: 8px;
  background: #0b1226;
  border: 1px dashed rgba(255, 255, 255, 0.2);
  border-radius: 8px;
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(160px, 1fr));
  gap: 12px;
  align-items: end;
}
label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 14px;
  color: var(--muted);
}
select {
  appearance: none;
  background: #0b1226;
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 10px;
  padding: 10px 12px;
}
button {
  padding: 10px 14px;
  border-radius: 10px;
  border: none;
  cursor: pointer;
  font-weight: 600;
}
button.primary {
  background: var(--accent);
  color: #052e2b;
}
button.ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: var(--text);
}
button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.hint {
  color: var(--muted);
  margin-top: 8px;
}

.progress {
  height: 10px;
  background: #0b1226;
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
  margin-top: 10px;
}
.progress .bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.15s ease;
}
.stats {
  margin-top: 10px;
  font-size: 14px;
  color: var(--muted);
}

.charts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.chart-wrap {
  background: #0b1226;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 12px;
  padding: 12px;
}
.chart-wrap h3 {
  margin: 0 0 8px;
}

/* Constrain charts card to avoid excessive page scroll */
.charts-card {
  max-height: 78vh;
  overflow: auto;
}
.chart-wrap canvas {
  max-height: 360px;
}

/* Small screens: single column charts */
@media (max-width: 800px) {
  .charts-grid {
    grid-template-columns: 1fr;
  }
}
.chart-wrap.wide {
  grid-column: 1 / -1;
}

.app-footer {
  text-align: center;
  color: var(--muted);
  padding: 24px;
}

/* Chart.js globals for child-friendly visuals */
:root {
  --chart-font: 14px;
}