:root {
  --chassis: #0d0f12;
  --surface-base: #13161b;
  --surface-card: #181c23;
  --surface-elevated: #20252e;
  
  --border-subtle: rgba(255, 255, 255, 0.07);
  --border-strong: rgba(255, 255, 255, 0.14);
  
  --accent: #22c55e;
  --accent-light: #4ade80;
  --accent-dim: rgba(34, 197, 94, 0.14);
  --accent-border: rgba(34, 197, 94, 0.4);

  --col-gold: #eab308;
  --col-purple: #c084fc;
  --col-rose: #fb7185;
  --col-slate: #94a3b8;
  --col-red: #ef4444;

  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-tertiary: #64748b;
  --text-muted: #475569;

  --font-mono: "SF Mono", "JetBrains Mono", Menlo, Consolas, Monaco, monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
  user-select: none;
  -webkit-user-select: none;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

*::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

*::-webkit-scrollbar-track {
  background: #090b0e;
  border-radius: 4px;
}

*::-webkit-scrollbar-thumb {
  background: #2a313d;
  border: 2px solid #090b0e;
  border-radius: 6px;
}

*::-webkit-scrollbar-thumb:hover {
  background: #3f4a5c;
}

html {
  scrollbar-width: thin;
  scrollbar-color: #2a313d #090b0e;
  height: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: #08090b;
  color: var(--text-primary);
  min-height: 100%;
  min-height: 100dvh;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

button, input {
  background: none;
  border: none;
  padding: 0;
  margin: 0;
  font: inherit;
  color: inherit;
  outline: none;
  touch-action: manipulation;
}

button {
  cursor: pointer;
}

.mobile-view-toggle {
  display: none;
  padding: 8px 12px;
  background: #0d0f13;
  border-bottom: 1px solid var(--border-subtle);
  gap: 6px;
  justify-content: center;
  position: sticky;
  top: 0;
  z-index: 50;
}

.app-layout {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 20px;
  padding: 20px;
  width: 100%;
  max-width: 1300px;
  margin: 0 auto;
}

.panel-left {
  flex: 1;
  min-width: 320px;
  max-width: 620px;
  height: calc(100dvh - 40px);
  background: var(--surface-base);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.65);
}

.chassis {
  width: 480px;
  max-width: 100%;
  flex-shrink: 0;
  background: var(--surface-base);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.65);
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
}

.chassis.drag-over {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-dim);
}

.hide {
  display: none !important;
}

@media (max-width: 900px) {
  .mobile-view-toggle {
    display: flex;
  }
  .app-layout {
    flex-direction: column;
    padding: 10px 10px 76px 10px;
    align-items: center;
    gap: 10px;
  }
  .panel-left {
    flex: none;
    min-width: 0;
    width: 100%;
    max-width: 480px;
    height: calc(100dvh - 134px);
    min-height: 300px;
  }
  .chassis {
    flex: none;
    width: 100%;
    max-width: 480px;
  }
  .chassis.mobile-mini {
    position: fixed;
    left: 10px;
    right: 10px;
    bottom: 8px;
    width: auto;
    max-width: 480px;
    margin: 0 auto;
    padding: 8px 12px;
    border-radius: 10px;
    background: #161b22;
    border: 1px solid rgba(255, 255, 255, 0.16);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.85);
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    z-index: 60;
  }
  .panel-left.mobile-hide,
  .chassis.mobile-hide {
    display: none !important;
  }
}