:root {
  --bg: #0b0e11;
  --panel: #12161c;
  --border: #232830;
  --text: #d8dee6;
  --muted: #7b8595;
  --up: #26a69a;
  --down: #ef5350;
  --accent: #4fc3f7;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
}

header h1 {
  font-size: 16px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0;
  color: var(--accent);
}

main {
  flex: 1;
  display: flex;
  min-height: 0;
}

#chart-panel {
  flex: 1;
  min-width: 0;
  padding: 12px;
}

#chart-canvas {
  width: 100%;
  height: 100%;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 4px;
}

aside {
  width: 190px;
  flex-shrink: 0;
  border-left: 1px solid var(--border);
  padding: 8px;
  overflow-y: auto;
  font-size: 12px;
}

aside h3 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin: 10px 0 4px;
}

aside h3:first-child { margin-top: 0; }

aside p { margin: 2px 0; }

aside label { display: inline-block; margin: 2px 0; }

aside > div > div { margin: 1px 0; }

button, select, input {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 4px 8px;
  font-size: 12px;
}

header button, header select { padding: 4px 8px; font-size: 12px; }

aside button { width: 100%; text-align: left; padding: 3px 6px; }

button:hover { border-color: var(--accent); cursor: pointer; }

.tool-active { border-color: var(--accent); background: #1a2330; }

.context-menu {
  position: fixed;
  z-index: 100;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
  display: flex;
  flex-direction: column;
  min-width: 150px;
  padding: 4px;
}

.context-menu.hidden { display: none; }

.context-menu button {
  width: 100%;
  text-align: left;
  border: none;
  background: transparent;
  padding: 6px 10px;
}

.context-menu button:hover { background: #1a2330; border-color: transparent; }

.mobile-only { display: none; }

@media (max-width: 768px) {
  header {
    flex-wrap: wrap;
    gap: 8px;
    padding: 8px;
  }

  main {
    flex-direction: column;
  }

  #chart-panel {
    height: 100vh;
    padding: 8px;
  }

  #side-panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    width: auto;
    max-height: 45vh;
    overflow-y: auto;
    background: var(--panel);
    border-left: none;
    border-top: 1px solid var(--border);
    transform: translateY(calc(100% - 40px));
    transition: transform 0.2s ease-out;
    z-index: 10;
  }

  #side-panel.expanded {
    transform: translateY(0);
  }

  .mobile-only {
    display: block;
    width: 100%;
    text-align: center;
    margin-bottom: 6px;
  }
}