* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0a0e14;
  --panel: #0d1117;
  --card: #161b22;
  --border: #21262d;
  --text: #c9d1d9;
  --muted: #8b949e;
  --accent: #e07a5f;
  --accent2: #81b29a;
  --warn: #d29922;
  --err: #f85149;
  --ok: #3fb950;
}

html, body { width: 100%; height: 100%; overflow: hidden; font-family: 'Segoe UI', system-ui, sans-serif; background: var(--bg); color: var(--text); font-size: 14px; }

.app { display: flex; height: 100%; }

/* ── Left Panel ── */
.panel {
  width: 360px; min-width: 360px;
  background: var(--panel);
  border-right: 1px solid var(--border);
  overflow-y: auto; overflow-x: hidden;
  padding: 16px;
  display: flex; flex-direction: column; gap: 12px;
}

.panel h1 { font-size: 1.1rem; letter-spacing: 2px; color: var(--accent); text-align: center; margin-bottom: 4px; }
.panel h1 small { display: block; font-size: 0.6rem; color: var(--muted); letter-spacing: 3px; font-weight: 400; margin-top: 2px; }

.card { background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 12px; }
.card h2 { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 1.5px; color: var(--muted); margin-bottom: 10px; }

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }

label { display: flex; flex-direction: column; gap: 3px; }
label span { font-size: 0.7rem; color: var(--muted); }

input[type="number"], select {
  background: var(--bg); border: 1px solid var(--border); border-radius: 4px;
  color: var(--text); padding: 7px 8px; font-size: 13px; width: 100%;
}
input[type="number"]:focus, select:focus { border-color: var(--accent); outline: none; }

.btnrow { display: flex; gap: 8px; flex-wrap: wrap; }
.btnrow button, .filebtn {
  flex: 1; min-width: 80px; padding: 8px 12px;
  background: var(--card); border: 1px solid var(--border); border-radius: 6px;
  color: var(--text); font-size: 12px; cursor: pointer; text-align: center;
  transition: border-color 0.15s;
}
.btnrow button:hover, .filebtn:hover { border-color: var(--accent); }
.filebtn { position: relative; display: inline-flex; align-items: center; justify-content: center; }
.filebtn input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }

.hint { font-size: 0.7rem; color: var(--muted); }

/* Shape chips */
.shape-library { display: flex; flex-wrap: wrap; gap: 6px; }
.shape-chip {
  padding: 6px 12px; background: var(--bg); border: 1px solid var(--border);
  border-radius: 12px; font-size: 11px; cursor: pointer; color: var(--muted);
  transition: all 0.15s;
}
.shape-chip:hover { border-color: var(--accent); color: var(--text); }

/* Folder STL items */
.folder-stl-list { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; }
.folder-stl-item {
  padding: 5px 10px; background: var(--bg); border: 1px solid var(--border);
  border-radius: 12px; font-size: 11px; cursor: pointer; color: var(--muted);
  transition: all 0.15s; max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.folder-stl-item:hover { border-color: var(--accent); color: var(--text); }
.folder-stl-item.active { border-color: var(--accent); color: var(--accent); background: rgba(224,122,95,0.1); }

/* Mode buttons */
.mode-btns { display: flex; gap: 6px; }
.mode-btn {
  flex: 1; padding: 7px 10px; background: var(--bg); border: 1px solid var(--border);
  border-radius: 6px; font-size: 11px; cursor: pointer; color: var(--muted);
  text-align: center; transition: all 0.15s;
}
.mode-btn:hover { border-color: var(--accent); color: var(--text); }
.mode-btn.active { border-color: var(--accent); color: var(--accent); }

/* Addon list */
.addon-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 6px 10px; margin-bottom: 4px;
  background: var(--bg); border: 1px solid var(--border); border-radius: 6px;
  font-size: 12px; cursor: pointer; transition: all 0.15s;
}
.addon-item:hover { border-color: var(--muted); }
.addon-item.selected { border-color: var(--accent); color: var(--accent); }
.addon-item .color-dot { width: 10px; height: 10px; border-radius: 50%; margin-right: 8px; flex-shrink: 0; }
.addon-item .name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.addon-item .touch-indicator { font-size: 9px; margin-right: 6px; padding: 1px 5px; border-radius: 4px; font-weight: 600; }
.addon-item .touch-indicator.touching { background: rgba(63,185,80,0.2); color: var(--ok); }
.addon-item .touch-indicator.away { background: rgba(139,148,158,0.1); color: var(--muted); }
.addon-item .del-btn {
  background: none; border: none; color: var(--muted); cursor: pointer;
  font-size: 14px; padding: 2px 6px; line-height: 1;
}
.addon-item .del-btn:hover { color: var(--err); }

/* Negative toggle button */
.neg-toggle-btn {
  width: 100%; padding: 8px 12px; margin-top: 8px;
  background: rgba(139,148,158,0.1); border: 1px solid var(--border); border-radius: 6px;
  color: var(--muted); font-size: 11px; cursor: pointer; text-align: center;
  transition: all 0.15s;
}
.neg-toggle-btn:hover { border-color: var(--accent); color: var(--text); }
.neg-toggle-btn.is-negative {
  background: rgba(248,81,73,0.15); border-color: var(--err); color: var(--err);
}
.touch-indicator.negative {
  background: rgba(248,81,73,0.2); color: var(--err);
}

/* Collision status box */
.collision-status {
  background: var(--bg); border: 1px solid var(--border); border-radius: 6px;
  padding: 8px 10px; margin-top: 8px; font-size: 11px; line-height: 1.6;
}
.collision-status .status-touching { color: var(--ok); font-weight: 600; }
.collision-status .status-away { color: var(--muted); }
.collision-status .status-penetrating { color: var(--warn); font-weight: 600; }
.collision-status .val { color: var(--accent); font-weight: 600; }

/* Snap button */
.snap-surface-btn {
  width: 100%; padding: 8px 12px; margin-top: 8px;
  background: rgba(63,185,80,0.1); border: 1px solid var(--ok); border-radius: 6px;
  color: var(--ok); font-size: 12px; cursor: pointer; text-align: center;
  transition: all 0.15s;
}
.snap-surface-btn:hover { background: rgba(63,185,80,0.2); }

/* Toggle */
.toggle-row { display: flex; align-items: center; gap: 8px; margin-top: 6px; }
.toggle-row input[type="checkbox"] { accent-color: var(--accent); width: 16px; height: 16px; }
.toggle-row label { flex-direction: row; font-size: 12px; color: var(--text); gap: 6px; }

.foot { text-align: center; padding: 10px 0; }
.foot .mini { font-size: 0.65rem; color: var(--muted); line-height: 1.6; }

/* ── Right: 3D View ── */
.view { flex: 1; position: relative; overflow: hidden; }
.view canvas { width: 100% !important; height: 100% !important; display: block; }

.info-overlay {
  position: absolute; bottom: 16px; left: 50%; transform: translateX(-50%);
  background: rgba(0,0,0,0.6); backdrop-filter: blur(8px);
  border-radius: 8px; padding: 8px 20px; font-size: 0.75rem; color: var(--muted);
  pointer-events: none; white-space: nowrap;
}

/* Keyboard hint */
.kb-hint {
  position: absolute; top: 12px; left: 12px;
  background: rgba(0,0,0,0.5); backdrop-filter: blur(6px);
  border-radius: 6px; padding: 6px 12px; font-size: 10px; color: var(--muted);
  pointer-events: none; line-height: 1.6;
}
.kb-hint kbd {
  background: var(--card); border: 1px solid var(--border); border-radius: 3px;
  padding: 1px 5px; font-size: 10px; font-family: inherit;
}

/* Toast */
.toast-container { position: fixed; top: 16px; right: 16px; z-index: 999; display: flex; flex-direction: column; gap: 8px; }
.toast {
  display: flex; align-items: center; gap: 8px; padding: 10px 16px;
  background: var(--card); border: 1px solid var(--border); border-radius: 8px;
  font-size: 13px; animation: slideIn 0.2s; transition: opacity 0.3s;
}
.toast.success { border-color: var(--ok); }
.toast.error { border-color: var(--err); }
@keyframes slideIn { from { transform: translateX(40px); opacity: 0; } }

/* Section divider */
.section-divider { border: none; border-top: 1px solid var(--border); margin: 4px 0; }

/* Responsive */
@media (max-width: 768px) {
  .app { flex-direction: column; }
  .panel { width: 100%; min-width: 0; max-height: 50vh; }
}