:root {
  --bg: #050816;
  --bg-elevated: #0b1022;
  --border: #1b2440;
  --text-main: #f5f7ff;
  --text-muted: #9ba4cf;
  --accent-blue: #40b5ff;
  --accent-green: #00e6a8;
  --accent-danger: #ff6b8b;
  --shadow-soft: 0 16px 40px rgba(0, 0, 0, 0.5);
  --radius-xl: 18px;
  --radius-lg: 14px;
  --radius-pill: 999px;
  --spacing: 16px;
  --font-main: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
}

/* Base */

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

html,
body {
  margin: 0;
  padding: 0;
  background: radial-gradient(circle at top, #071427 0, #050816 52%, #01030a 100%);
  color: var(--text-main);
  font-family: var(--font-main);
}

body {
  min-height: 100vh;
}

.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 12px 24px;
}

/* Header */

.app-header {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 18px;
}

.title-block h1 {
  font-size: 1.6rem;
  margin: 0 0 4px;
  letter-spacing: 0.04em;
}

.subtitle {
  margin: 0;
  font-size: 0.92rem;
  color: var(--text-muted);
}

.accent {
  color: var(--accent-green);
}

.badge-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.badge {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.06);
  background: rgba(8, 16, 40, 0.9);
}

.badge-demo {
  border-color: var(--accent-danger);
  color: var(--accent-danger);
}

.badge-open {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

/* Layout */

.layout-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: 14px;
}

.card {
  background: radial-gradient(circle at top left, #141f3f, #070b1c 48%, #050816);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: var(--shadow-soft);
  padding: 14px 14px 16px;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: -60%;
  opacity: 0.4;
  background:
    radial-gradient(circle at 0% 0%, rgba(64, 181, 255, 0.12), transparent 55%),
    radial-gradient(circle at 100% 0%, rgba(0, 230, 168, 0.12), transparent 55%);
  pointer-events: none;
}

.card > * {
  position: relative;
  z-index: 1;
}

.card h2 {
  margin: 0 0 4px;
  font-size: 1.1rem;
}

.card-intro {
  margin: 0 0 10px;
  font-size: 0.86rem;
  color: var(--text-muted);
}

/* Controls */

.control-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 12px;
}

.control label {
  display: block;
  font-size: 0.8rem;
  margin-bottom: 2px;
  color: var(--text-muted);
}

.control-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.control input[type="range"] {
  flex: 1;
  accent-color: var(--accent-green);
}

.control .value {
  min-width: 48px;
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-size: 0.8rem;
  color: var(--accent-blue);
}

/* Buttons */

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 10px;
}

.btn {
  border-radius: var(--radius-pill);
  padding: 7px 14px;
  font-size: 0.82rem;
  border: 1px solid transparent;
  background: none;
  color: var(--text-main);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  transition: transform 0.08s ease, box-shadow 0.08s ease,
    background 0.12s ease, border-color 0.12s ease;
}

.btn:active {
  transform: translateY(1px) scale(0.99);
  box-shadow: none;
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent-green), var(--accent-blue));
  border-color: rgba(0, 0, 0, 0.1);
  box-shadow: 0 8px 22px rgba(0, 230, 168, 0.35);
  color: #02040a;
  font-weight: 600;
}

.btn.ghost {
  border-color: rgba(255, 255, 255, 0.1);
  background: rgba(7, 12, 24, 0.9);
  color: var(--text-muted);
}

.btn:hover {
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.7);
}

/* Footnote */

.footnote {
  margin: 4px 0 0;
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Summary & stats */

.summary-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.stat {
  background: rgba(7, 10, 22, 0.9);
  border-radius: var(--radius-lg);
  padding: 7px 9px;
  border: 1px solid rgba(255, 255, 255, 0.03);
}

.stat .label {
  display: block;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.stat .value {
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

.stat-comment {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Legend */

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.swatch {
  width: 12px;
  height: 12px;
  border-radius: 4px;
}

.swatch-blue {
  background: var(--accent-blue);
}

.swatch-green {
  background: var(--accent-green);
}

/* Charts */

.chart-card {
  grid-column: 1 / -1;
}

.card-header-row {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 6px;
}

.card-subtitle {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.chart-wrapper {
  position: relative;
  height: 260px;
  margin-top: 4px;
}

/* Footer */

.app-footer {
  margin-top: 16px;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: center;
}

/* Responsive */

@media (max-width: 860px) {
  .layout-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .chart-wrapper {
    height: 260px;
  }
}

@media (max-width: 600px) {
  .app-shell {
    padding-inline: 10px;
  }

  .card {
    padding-inline: 12px;
  }

  .chart-wrapper {
    height: 230px;
  }
}