:root {
  --bg: #0a0a0a;
  --fg: #eaeaea;
  --muted: #bdbdbd;
  --accent: #ffd54a;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--fg);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; }
main { max-width: 780px; margin: 3rem auto; padding: 1rem; }

h1 { margin: 0 0 0.5rem; font-weight: 700; }
p { color: var(--muted); margin-top: 0; }

.settings {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px;
  padding: 1.5rem;
  margin: 2rem 0;
}

.settings h3 {
  margin: 0 0 1rem;
  color: var(--accent);
  font-weight: 600;
}

.setting-group {
  margin: 1rem 0;
}

.setting-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: var(--fg);
}

.custom-dropdown {
  position: relative;
  width: 100%;
}

.dropdown-selected {
  width: 100%;
  padding: 1rem;
  background: var(--bg);
  color: var(--fg);
  border: 2px solid rgba(255,255,255,0.2);
  border-radius: 12px;
  font-size: 1.1rem;
  cursor: pointer;
  user-select: none;
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: all 0.2s ease;
}

.dropdown-selected::after {
  content: '▼';
  color: var(--accent);
  font-size: 0.8rem;
  margin-left: 0.5rem;
}

.dropdown-selected:hover {
  border-color: var(--accent);
  background: rgba(255,255,255,0.02);
}

.dropdown-selected.active {
  border-color: var(--accent);
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

.dropdown-selected.active::after {
  content: '▲';
}

.dropdown-options {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--bg);
  border: 2px solid var(--accent);
  border-top: none;
  border-radius: 0 0 12px 12px;
  z-index: 1000;
  max-height: 300px;
  overflow-y: auto;
}

.dropdown-option {
  padding: 1rem;
  cursor: pointer;
  font-size: 1.1rem;
  min-height: 48px;
  display: flex;
  align-items: center;
  transition: background-color 0.2s ease;
  user-select: none;
}

.dropdown-option:hover {
  background: rgba(255,213,74,0.1);
}

.dropdown-option.selected {
  background: rgba(255,213,74,0.2);
  color: var(--accent);
}

.dropdown-option:last-child {
  border-bottom-left-radius: 10px;
  border-bottom-right-radius: 10px;
}

button {
  background: var(--accent); color: #3a2f00; border: none; border-radius: 10px;
  padding: 0.8rem 1.2rem; font-size: 1rem; font-weight: 700; cursor: pointer;
}
button:hover { filter: brightness(1.05); }
button:active { filter: brightness(0.95); }

#hud {
  position: fixed; left: 50%; transform: translateX(-50%); bottom: 18px;
  background: rgba(10,10,10,0.6); backdrop-filter: blur(6px);
  border: 1px solid rgba(255,255,255,0.1); padding: 10px 12px; border-radius: 12px;
}
#hud .row { display: flex; gap: 12px; align-items: center; justify-content: center; margin: 4px 0; }
#score { color: var(--accent); font-weight: 800; }
#fps { color: var(--muted); }
.hidden { display: none !important; }

/* Equation banner (oben fix) */
.equation {
  position: fixed;
  top: 16px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 14px;
  border-radius: 12px;
  background: rgba(10,10,10,0.65);
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255,255,255,0.12);
  color: #fff;
  font-weight: 800;
  font-size: 1.1rem;
  z-index: 10000;
  white-space: pre-line;
}

