:root {
  --bg: #161a21;
  --panel: rgba(30, 36, 47, 0.92);
  --panel-edge: #39445a;
  --text: #e6eaf2;
  --dim: #94a0b6;
  --accent: #3ddc97;
  --btn: #2d3647;
  --btn-hover: #3a465c;
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overflow: hidden; background: var(--bg); color: var(--text);
  font: 14px/1.4 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; user-select: none; }
#game { position: fixed; inset: 0; width: 100vw; height: 100vh; display: block; cursor: crosshair; }

.panel { background: var(--panel); border: 1px solid var(--panel-edge); border-radius: 12px;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35); backdrop-filter: blur(6px); }
.hidden { display: none !important; }
.dim { color: var(--dim); }
code { font-family: ui-monospace, Consolas, monospace; font-size: 12px; background: #11151c; padding: 1px 5px; border-radius: 4px; color: #cfe3ff; }
kbd { font-family: ui-monospace, Consolas, monospace; font-size: 11px; background: #11151c; border: 1px solid #44506a;
  border-bottom-width: 2px; border-radius: 4px; padding: 0 5px; color: var(--text); }
button { font: inherit; color: var(--text); background: var(--btn); border: 1px solid #46536d; border-radius: 8px;
  padding: 6px 12px; cursor: pointer; }
button:hover:not(:disabled) { background: var(--btn-hover); }
button:disabled { opacity: 0.45; cursor: default; }
button.danger { border-color: #8a3a44; color: #ffb3bb; }

#level-card { position: fixed; top: 12px; left: 12px; width: 300px; padding: 10px 12px; }
.lc-head { display: flex; justify-content: space-between; font-weight: 700; }
#lc-count { color: var(--accent); font-variant-numeric: tabular-nums; }
.lc-body { display: flex; gap: 10px; align-items: center; margin-top: 6px; }
#lc-shape { width: 64px; height: 64px; background: #11151c; border-radius: 10px; flex: none; }
.lc-side { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: 6px; }
#lc-code { word-break: break-all; }
.bar { height: 8px; background: #11151c; border-radius: 4px; overflow: hidden; }
#lc-bar { height: 100%; width: 0; background: var(--accent); transition: width 0.2s; }
#lc-unlock { font-size: 12px; }
#lc-hint { margin: 8px 0 0; font-size: 12.5px; color: #c2cbdb; }

#top-right { position: fixed; top: 12px; right: 12px; display: flex; gap: 8px; align-items: center; padding: 8px; }
#points { font-weight: 700; color: #9fd0ff; padding: 0 8px; font-variant-numeric: tabular-nums; }

#info { position: fixed; left: 12px; bottom: 12px; padding: 8px 12px; font-size: 12.5px; max-width: 340px; pointer-events: none; }
#tool-info { position: fixed; left: 50%; transform: translateX(-50%); bottom: 84px; padding: 8px 14px; max-width: 560px; text-align: center; pointer-events: none; }
#tool-info p { margin: 2px 0 6px; color: #c2cbdb; font-size: 13px; }
#tool-info .keys { font-size: 12px; color: var(--dim); }

#toolbar { position: fixed; left: 50%; transform: translateX(-50%); bottom: 12px; display: flex; gap: 4px; padding: 6px; }
.tool { position: relative; width: 56px; height: 56px; padding: 4px; display: flex; align-items: center; justify-content: center;
  background: #252d3b; border-color: #3a465c; }
.tool.active { border-color: var(--accent); box-shadow: 0 0 0 2px rgba(61, 220, 151, 0.35) inset; background: #2c3a3a; }
.tool.locked { opacity: 0.35; }
.tool-icon { width: 44px; height: 44px; }
.tool-key { position: absolute; top: 2px; left: 5px; font-size: 10px; font-weight: 700; color: var(--dim); }

.modal { position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); width: min(760px, calc(100vw - 32px));
  max-height: calc(100vh - 40px); overflow: auto; padding: 18px 22px; z-index: 10; }
.modal h2 { margin: 0 0 10px; font-size: 20px; }
.modal h3 { margin: 12px 0 6px; font-size: 15px; color: #9fd0ff; }
.modal ul { margin: 0; padding-left: 18px; }
.modal li { margin: 3px 0; }
.modal .close { position: absolute; top: 10px; right: 10px; padding: 2px 9px; }
.cols { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
#modal-upgrades { width: min(460px, calc(100vw - 32px)); }
.upg { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 10px 0; border-top: 1px solid #323c50; }
.upg button { min-width: 110px; }
#modal-menu { width: min(340px, calc(100vw - 32px)); }
.menu-buttons { display: flex; flex-direction: column; gap: 8px; }
#modal-level { width: min(380px, calc(100vw - 32px)); text-align: center; }
#lc-done-shape { width: 112px; height: 112px; background: #11151c; border-radius: 14px; }

#toasts { position: fixed; top: 70px; left: 50%; transform: translateX(-50%); display: flex; flex-direction: column; gap: 6px; align-items: center; z-index: 20; pointer-events: none; }
.toast { background: var(--panel); border: 1px solid var(--panel-edge); padding: 8px 14px; border-radius: 10px; transition: opacity 0.5s; }
.toast.out { opacity: 0; }

@media (max-width: 900px) {
  .cols { grid-template-columns: 1fr; }
  #level-card { width: 240px; }
  #info { display: none; }
  .tool { width: 44px; height: 44px; }
  .tool-icon { width: 34px; height: 34px; }
  #toolbar { max-width: calc(100vw - 16px); overflow-x: auto; }
}