:root {
  color-scheme: dark;
  --bg: #111827;
  --panel: #1f2937;
  --panel-2: #273449;
  --text: #f3f4f6;
  --muted: #9ca3af;
  --accent: #38bdf8;
  --accent-2: #22c55e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, Segoe UI, Roboto, sans-serif;
  background: linear-gradient(135deg, #020617, #111827);
  color: var(--text);
}

button,
input {
  font: inherit;
}

button {
  border: none;
  border-radius: 8px;
  padding: 10px 14px;
  cursor: pointer;
  background: var(--accent);
  color: white;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

button:hover {
  transform: translateY(-1px);
}

button.secondary {
  background: var(--panel-2);
}

.app-shell {
  max-width: 1400px;
  margin: 0 auto;
  padding: 24px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.topbar h1 {
  margin: 0 0 6px;
  font-size: 1.6rem;
}

.topbar p {
  margin: 0;
  color: var(--muted);
}

.topbar-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.workspace {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 20px;
}

.sidebar,
.editor-panel {
  background: rgba(31, 41, 55, 0.95);
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 10px 35px rgba(2, 6, 23, 0.3);
}

.frame-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.frame-item {
  width: 100%;
  text-align: left;
  background: var(--panel-2);
  color: var(--text);
}

.frame-item.active {
  outline: 2px solid var(--accent);
  background: #1e3a5f;
}

.editor-toolbar {
  display: flex;
  gap: 10px;
  align-items: center;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.editor-toolbar label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  color: var(--muted);
  font-size: 0.95rem;
}

.editor-toolbar input {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid rgba(148, 163, 184, 0.2);
  background: var(--panel-2);
  color: var(--text);
}

canvas {
  display: block;
  width: 100%;
  max-width: 800px;
  height: auto;
  background: white;
  border-radius: 12px;
  border: 1px solid rgba(148, 163, 184, 0.2);
}

.hint {
  color: var(--muted);
  margin-top: 10px;
}

@media (max-width: 900px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .sidebar {
    order: 2;
  }
}