* { 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: 340px; min-width: 340px;
  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; }
.grid3 { display: grid; grid-template-columns: 1fr 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); }

/* Preset chips */
.preset-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.preset-chip {
  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;
}
.preset-chip:hover { border-color: var(--accent); color: var(--text); }

/* Warnings */
.warnings .ok { color: var(--ok); font-size: 12px; }
.warnings .warn { color: var(--warn); font-size: 12px; }
.warnings .err { color: var(--err); font-size: 12px; }

.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;
}

/* 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; } }

/* Split indicator colors */
.split-legend { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.split-legend .dot { width: 10px; height: 10px; border-radius: 50%; display: inline-block; margin-right: 4px; vertical-align: middle; }

/* Split chips */
.split-chips { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 6px; }
.split-chip {
  display: inline-block; padding: 3px 8px; border-radius: 10px;
  font-size: 10px; color: #fff; font-weight: 600;
  text-shadow: 0 1px 2px rgba(0,0,0,0.5);
}

/* Split info */
.split-info {
  background: var(--bg); border: 1px solid var(--border); border-radius: 6px;
  padding: 8px 10px; font-size: 11px; color: var(--muted); line-height: 1.6;
}
.split-info strong { color: var(--text); }

/* Dowel card conditional visibility */
#dowelCard { transition: opacity 0.15s; }
#dowelCard .hint { margin-top: 4px; }

/* Details summary style */
details.card summary { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 1.5px; }
details.card[open] summary { margin-bottom: 4px; }
details.card > div { animation: fadeIn 0.15s ease-out; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* Checkbox 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; }

/* Auto-calc display */
.calc-box {
  background: var(--bg); border: 1px solid var(--border); border-radius: 6px;
  padding: 8px 10px; margin-top: 8px; font-size: 11px; color: var(--muted); line-height: 1.6;
}
.calc-box .val { color: var(--accent); font-weight: 600; }
.calc-box .label { color: var(--text); }

/* Section conditional visibility */
.section-hidden { display: none !important; }

/* Stack visualizer */
.stack-bar { display: flex; height: 18px; border-radius: 4px; overflow: hidden; margin-top: 6px; gap: 1px; }
.stack-bar div { display: flex; align-items: center; justify-content: center; font-size: 9px; color: #fff; min-width: 20px; }

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