:root {
  --bg-color: #050816;
  --bg-elevated: #0b1020;
  --bg-panel: #111827;
  --border-subtle: rgba(255, 255, 255, 0.08);
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.15);
  --accent-strong: #0ea5e9;
  --text-primary: #e5e7eb;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --danger: #f97373;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
}

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

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

body {
  font-family: var(--font-sans);
  background: radial-gradient(circle at top, #111827 0, var(--bg-color) 50%);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}

.app-header {
  border-bottom: 1px solid var(--border-subtle);
  background: linear-gradient(
    to right,
    rgba(56, 189, 248, 0.1),
    rgba(129, 140, 248, 0.1)
  );
}

.header-main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1.75rem 1.25rem 1.25rem;
}

.header-main h1 {
  margin: 0 0 0.5rem;
  font-size: 1.7rem;
  letter-spacing: 0.03em;
}

.header-main p {
  margin: 0;
  max-width: 720px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.app-main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2rem;
  display: grid;
  grid-template-columns: minmax(0, 340px) minmax(0, 1.5fr);
  gap: 1.5rem;
}

.controls-panel,
.chart-panel {
  background: var(--bg-panel);
  border-radius: 0.9rem;
  border: 1px solid var(--border-subtle);
  box-shadow: 0 18px 40px rgba(15, 23, 42, 0.55);
  padding: 1.25rem 1.4rem 1.4rem;
}

.section-title {
  margin: 0 0 0.7rem;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.11em;
  color: var(--text-muted);
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem 1rem;
  margin-bottom: 1.1rem;
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 0.9rem;
}

.field-group label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
}

select,
input[type="time"] {
  appearance: none;
  border-radius: 0.55rem;
  border: 1px solid var(--border-subtle);
  padding: 0.45rem 0.8rem;
  font-size: 0.9rem;
  background-color: var(--bg-elevated);
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.12s ease, box-shadow 0.12s ease,
    background-color 0.12s ease;
}

select:focus,
input[type="time"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-soft);
  background-color: #020617;
}

select[multiple] {
  min-height: 220px;
  resize: vertical;
}

.multi-select-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.helper-text {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.05rem 0.3rem;
  border-radius: 0.25rem;
  border: 1px solid var(--border-subtle);
  background-color: #020617;
  font-size: 0.7rem;
}

.actions-row {
  margin-top: 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.primary-button {
  border-radius: 999px;
  padding: 0.45rem 1.2rem;
  border: none;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: radial-gradient(circle at top left, #38bdf8, #6366f1);
  color: #0b1120;
  box-shadow: 0 10px 25px rgba(56, 189, 248, 0.35);
  transition: transform 0.09s ease, box-shadow 0.09s ease, filter 0.1s ease;
}

.primary-button:hover {
  transform: translateY(-1px);
  filter: brightness(1.05);
  box-shadow: 0 14px 30px rgba(56, 189, 248, 0.4);
}

.primary-button:active {
  transform: translateY(0);
  box-shadow: 0 8px 18px rgba(56, 189, 248, 0.3);
}

.primary-button:disabled {
  opacity: 0.55;
  cursor: default;
  box-shadow: none;
}

.secondary-button {
  border-radius: 999px;
  padding: 0.45rem 1rem;
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: transparent;
  color: var(--text-secondary);
  transition: border-color 0.12s ease, color 0.12s ease, background-color 0.12s ease;
}

.secondary-button:hover {
  border-color: var(--accent);
  color: var(--accent);
  background-color: var(--accent-soft);
}

.secondary-button:active {
  background-color: rgba(56, 189, 248, 0.25);
}

.status-message {
  min-height: 1.2em;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.status-message--error {
  color: var(--danger);
}

.chart-description {
  margin: 0 0 0.9rem;
  font-size: 0.86rem;
  color: var(--text-secondary);
}

.chart-container {
  position: relative;
  width: 100%;
  min-height: 280px;
}

.chart-container canvas {
  width: 100% !important;
  height: 100% !important;
}

.app-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 0.9rem 1.25rem 1.3rem;
  margin-top: 0.5rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  text-align: center;
}

.app-footer p {
  margin: 0;
}

@media (max-width: 920px) {
  .app-main {
    grid-template-columns: minmax(0, 1fr);
  }

  .controls-panel {
    order: 2;
  }

  .chart-panel {
    order: 1;
  }
}

@media (max-width: 640px) {
  .app-main {
    padding-inline: 1rem;
  }

  .header-main {
    padding-inline: 1rem;
  }

  .controls-grid {
    grid-template-columns: minmax(0, 1fr);
  }
}