:root {
  --primary:    #1565C0;
  --primary-lt: #E3F2FD;
  --success:    #2E7D32;
  --success-lt: #E8F5E9;
  --warn:       #F57F17;
  --warn-lt:    #FFF9C4;
  --danger:     #C62828;
  --danger-lt:  #FFEBEE;
  --neutral:    #424242;
  --bg:         #F5F7FA;
  --card:       #FFFFFF;
  --border:     #E0E0E0;
  --radius:     8px;
  --shadow:     0 2px 8px rgba(0,0,0,.09);
}

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

body {
  font-family: "Inter", "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--neutral);
  line-height: 1.5;
}

header {
  background: var(--primary);
  color: #fff;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 2px 6px rgba(0,0,0,.2);
}
header h1 { font-size: 1.2rem; font-weight: 600; }
header .subtitle { font-size: .85rem; opacity: .8; }

main {
  max-width: 1200px;
  margin: 24px auto;
  padding: 0 16px;
  display: grid;
  gap: 20px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.card h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 14px;
  color: var(--primary);
  border-bottom: 2px solid var(--primary-lt);
  padding-bottom: 6px;
}

/* Upload-Bereich */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 32px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color .2s, background .2s;
}
.upload-zone:hover, .upload-zone.drag { border-color: var(--primary); background: var(--primary-lt); }
.upload-zone input[type=file] { display: none; }
.upload-zone .icon { font-size: 2.5rem; margin-bottom: 8px; }
.upload-zone p { color: #757575; font-size: .9rem; }
.upload-zone strong { color: var(--primary); }

/* Tabs */
.tabs { display: flex; gap: 0; border-bottom: 2px solid var(--border); margin-bottom: 16px; }
.tab-btn {
  padding: 8px 20px;
  border: none;
  background: none;
  cursor: pointer;
  font-size: .9rem;
  color: #757575;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color .15s, border-color .15s;
}
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 600; }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* Formular */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 10px;
}
.form-group label { display: block; font-size: .8rem; color: #616161; margin-bottom: 3px; }
.form-group input, .form-group select {
  width: 100%;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: .9rem;
}
.form-group input:focus, .form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(21,101,192,.15);
}

.section-label {
  grid-column: 1/-1;
  font-weight: 600;
  font-size: .85rem;
  color: var(--primary);
  margin-top: 6px;
}

/* Buttons */
.btn {
  padding: 9px 20px;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: .9rem;
  font-weight: 600;
  transition: opacity .15s;
}
.btn:hover { opacity: .85; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-secondary { background: #E0E0E0; color: var(--neutral); }
.btn-sm { padding: 5px 12px; font-size: .8rem; }

.actions { display: flex; gap: 10px; margin-top: 14px; align-items: center; }

/* Konfidenz-Badge */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: .78rem;
  font-weight: 600;
}
.badge-ok   { background: var(--success-lt); color: var(--success); }
.badge-warn { background: var(--warn-lt);    color: var(--warn); }
.badge-err  { background: var(--danger-lt);  color: var(--danger); }

/* Ergebnis-Tabellen */
.result-section { margin-bottom: 20px; }
.result-section h3 {
  font-size: .9rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--neutral);
}

table.vcg-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .85rem;
}
.vcg-table th {
  background: #F5F5F5;
  padding: 6px 10px;
  text-align: left;
  border: 1px solid var(--border);
  font-weight: 600;
  white-space: nowrap;
}
.vcg-table td {
  padding: 5px 10px;
  border: 1px solid var(--border);
}
.vcg-table tr:nth-child(even) { background: #FAFAFA; }

/* Farbkategorien */
.cat-normal        { color: var(--success); font-weight: 600; }
.cat-grenzwertig   { color: var(--warn);    font-weight: 600; }
.cat-erhoeht       { color: var(--danger);  font-weight: 600; }
.cat-erniedrigt    { color: var(--danger);  font-weight: 600; }
.cat-unknown       { color: #9E9E9E; }

/* 3D Container */
#pavs-container {
  width: 100%;
  height: 520px;
  border-radius: var(--radius);
  overflow: hidden;
}

#achsen-legende {
  font-size: .82rem;
  padding: 8px 0 4px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* Spinner */
.spinner {
  display: none;
  width: 28px; height: 28px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  margin-left: 10px;
}
.spinner.active { display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

/* Alerts */
.alert {
  padding: 10px 14px;
  border-radius: var(--radius);
  margin-bottom: 12px;
  font-size: .88rem;
}
.alert-info  { background: var(--primary-lt); color: var(--primary); border: 1px solid #90CAF9; }
.alert-warn  { background: var(--warn-lt);    color: #7F5B00;        border: 1px solid #FFE082; }
.alert-error { background: var(--danger-lt);  color: var(--danger);  border: 1px solid #EF9A9A; }

/* Responsive */
@media (max-width: 680px) {
  .form-grid { grid-template-columns: 1fr 1fr; }
  #pavs-container { height: 360px; }
}