:root {
  color-scheme: dark;
  font-family: "Inter", "Segoe UI", sans-serif;
  background-color: #050708;
  color: #f4f7fa;
}

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

body {
  min-height: 100vh;
  display: flex;
  align-items: stretch;
  justify-content: center;
  background: radial-gradient(circle at top, #0d1b24 0%, #040607 65%);
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
  width: 100vw;
  min-height: 100vh;
}

.control-panel {
  padding: 2rem 1.5rem;
  background: rgba(11, 17, 24, 0.9);
  backdrop-filter: blur(12px);
  border-right: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.app-title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.app-tagline {
  font-size: 0.95rem;
  color: rgba(244, 247, 250, 0.75);
  line-height: 1.5;
}

.primary-actions {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.accent-button.emphasis {
  font-size: 1rem;
  padding: 0.75rem 1.75rem;
  box-shadow: 0 14px 28px rgba(87, 184, 255, 0.35);
}

.primary-hint {
  font-size: 0.8rem;
  color: rgba(244, 247, 250, 0.65);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.control-group label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: rgba(244, 247, 250, 0.64);
}

.label-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.help-icon {
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  border: 1px solid rgba(244, 247, 250, 0.4);
  background: transparent;
  color: rgba(244, 247, 250, 0.8);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  position: relative;
  transition: border-color 0.2s ease, color 0.2s ease;
  padding: 0;
  line-height: 1;
}

.help-icon:hover,
.help-icon:focus-visible {
  border-color: rgba(87, 184, 255, 0.8);
  color: rgba(87, 184, 255, 0.9);
}

.help-icon::after {
  content: attr(data-tooltip);
  position: absolute;
  inset-inline-start: 50%;
  transform: translateX(-50%) translateY(-6px);
  bottom: 110%;
  width: max(180px, 18ch);
  background: rgba(5, 11, 16, 0.92);
  color: rgba(244, 247, 250, 0.95);
  border: 1px solid rgba(87, 184, 255, 0.4);
  border-radius: 8px;
  padding: 0.55rem 0.7rem;
  font-size: 0.75rem;
  line-height: 1.35;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 10;
}

.help-icon:hover::after,
.help-icon:focus-visible::after {
  opacity: 1;
  transform: translateX(-50%) translateY(-2px);
}

.slider-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.slider-row input[type="number"] {
  width: 4.5rem;
  padding: 0.4rem 0.5rem;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(6, 11, 15, 0.75);
  color: inherit;
  font-size: 0.85rem;
  font-variant-numeric: tabular-nums;
}

.slider-row input[type="number"]:focus-visible {
  outline: 2px solid rgba(87, 184, 255, 0.65);
  outline-offset: 2px;
}

.direction-display {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.45rem;
  min-width: 5.5rem;
}

.direction-arrow {
  width: 1.6rem;
  height: 1.6rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(87, 184, 255, 0.18);
  color: rgba(244, 247, 250, 0.9);
  transition: transform 0.2s ease;
}

.slider-row input[type="range"] {
  flex: 1;
  accent-color: #57b8ff;
}

.slider-row output {
  width: 3.75rem;
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-size: 0.9rem;
}

.hint {
  font-size: 0.8rem;
  color: rgba(244, 247, 250, 0.58);
  line-height: 1.4;
}

.control-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: stretch;
}

.action-stack {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  flex: 1 1 160px;
}

.ghost-button {
  appearance: none;
  border-radius: 999px;
  padding: 0.55rem 1.2rem;
  background: rgba(12, 18, 22, 0.6);
  color: rgba(244, 247, 250, 0.85);
  border: 1px solid rgba(244, 247, 250, 0.2);
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.ghost-button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
}

.ghost-button:hover {
  transform: translateY(-1px);
  border-color: rgba(127, 255, 212, 0.45);
  color: rgba(244, 247, 250, 1);
}

.ghost-button:focus-visible {
  outline: 2px solid rgba(87, 184, 255, 0.65);
  outline-offset: 3px;
}

.danger-button {
  appearance: none;
  border-radius: 999px;
  padding: 0.55rem 1.2rem;
  background: rgba(255, 99, 71, 0.12);
  color: rgba(255, 132, 110, 0.95);
  border: 1px solid rgba(255, 132, 110, 0.4);
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
  align-self: flex-start;
}

.danger-button:hover {
  background: rgba(255, 99, 71, 0.22);
  border-color: rgba(255, 132, 110, 0.6);
  color: rgba(255, 179, 164, 1);
}

.danger-button:focus-visible {
  outline: 2px solid rgba(255, 132, 110, 0.55);
  outline-offset: 3px;
}

.select-input {
  appearance: none;
  padding: 0.5rem 0.75rem;
  border-radius: 8px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(8, 12, 16, 0.75);
  color: inherit;
  font-size: 0.9rem;
  letter-spacing: 0.01em;
}

.select-input:focus-visible {
  outline: 2px solid rgba(87, 184, 255, 0.65);
  outline-offset: 3px;
}

.inline-checkbox {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: rgba(244, 247, 250, 0.7);
  margin-top: 0.2rem;
}

.inline-checkbox input[type='checkbox'] {
  width: 1.1rem;
  height: 1.1rem;
  accent-color: #57b8ff;
}

.priority-description {
  font-size: 0.8rem;
  color: rgba(244, 247, 250, 0.65);
  line-height: 1.4;
}

.accent-button {
  appearance: none;
  border: none;
  border-radius: 999px;
  padding: 0.65rem 1.4rem;
  background: linear-gradient(135deg, #57b8ff 0%, #7fffd4 100%);
  color: #04121a;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.accent-button:disabled {
  opacity: 0.48;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.accent-button:focus-visible {
  outline: 2px solid rgba(127, 255, 212, 0.7);
  outline-offset: 3px;
}

.accent-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(94, 220, 199, 0.35);
}

.accent-button:active {
  transform: translateY(0);
  box-shadow: 0 4px 10px rgba(94, 220, 199, 0.25);
}

.accent-button.primary-action {
  flex: 1 1 100%;
  text-align: center;
}

.canvas-wrapper {
  position: relative;
  display: flex;
  align-items: stretch;
  justify-content: stretch;
  background: rgba(8, 9, 12, 0.7);
  overflow: hidden;
  height: 100vh;
  transition: outline 0.25s ease, box-shadow 0.25s ease;
}

.canvas-wrapper.highlight-drop {
  outline: 2px solid rgba(87, 184, 255, 0.6);
  box-shadow: 0 0 0 8px rgba(87, 184, 255, 0.12);
}

.canvas-host {
  width: 100%;
  height: 100%;
}

canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.drop-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  pointer-events: none;
  background: linear-gradient(
      120deg,
      rgba(87, 184, 255, 0.12),
      rgba(91, 199, 125, 0.06)
    );
  color: rgba(244, 247, 250, 0.78);
  font-weight: 500;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  opacity: 0;
  transition: opacity 0.25s ease;
}

.drop-overlay.visible {
  opacity: 1;
}

.drop-overlay.highlight {
  background: linear-gradient(
      120deg,
      rgba(87, 184, 255, 0.3),
      rgba(91, 199, 125, 0.18)
    );
  color: rgba(244, 247, 250, 0.92);
}

@media (max-width: 900px) {
  .app-shell {
    grid-template-columns: 1fr;
    grid-template-rows: auto 1fr;
  }

  .control-panel {
    align-items: flex-start;
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }

  .canvas-wrapper {
    height: calc(100vh - 280px);
    min-height: 320px;
  }

  .accent-button.primary-action {
    flex: 1 1 auto;
  }
}