:root {
  --color-primary: #2e7d32;
  --color-bg: #f4f6f4;
  --color-card: #ffffff;
  --color-text: #1b1b1b;
  --color-border: #d8ddd8;
  --color-ampel-green: #2e7d32;
  --color-ampel-yellow: #b8860b;
  --color-ampel-red: #c62828;
  --tap-min: 44px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
}

button, input, select {
  font: inherit;
  min-height: var(--tap-min);
}

button { cursor: pointer; }

/* [hidden] steht sonst gegen eigene display-Regeln auf #login-overlay/#app den
   Kuerzeren -- Autoren-CSS schlaegt das UA-Standardverhalten von [hidden], egal wie
   die Spezifitaet zwischen den Autoren-Selektoren aussieht. Ohne diese Regel bliebe
   das Login-Overlay dauerhaft sichtbar, auch nach erfolgreichem Login. */
#login-overlay[hidden],
#app[hidden] {
  display: none;
}

.overlay {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg);
  z-index: 100;
}

.login-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: min(320px, 90vw);
  padding: 24px;
  background: var(--color-card);
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.1);
}

.login-card h1 { margin: 0; color: var(--color-primary); }
.login-card p { margin: 0; }

#login-pin {
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 1.2rem;
  letter-spacing: 4px;
  text-align: center;
}

.login-card button[type="submit"] {
  padding: 10px;
  border: none;
  border-radius: 8px;
  background: var(--color-primary);
  color: white;
  font-weight: 600;
}

.error-text { color: var(--color-ampel-red); margin: 0; }

#app {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
}

.app-title { font-weight: 700; color: var(--color-primary); }

#actor-select {
  padding: 6px 8px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-card);
}

#screen-root {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  padding-bottom: 80px;
}

.tab-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  border-top: 1px solid var(--color-border);
  background: var(--color-card);
}

.tab-button {
  flex: 1;
  padding: 12px 0;
  border: none;
  background: none;
  font-weight: 600;
  color: #666;
}

.tab-button.active { color: var(--color-primary); }

/* Scan-Screen */
.scanner-viewport {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  background: #000;
  border-radius: 12px;
  overflow: hidden;
}

.scanner-viewport video,
.scanner-viewport #qr-fallback-region {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.scan-flash {
  position: absolute;
  inset: 0;
  background: rgba(46, 125, 50, 0.5);
  opacity: 0;
  pointer-events: none;
  transition: opacity 120ms ease-out;
}

.scan-flash.flash-active { opacity: 1; }

.mode-toggle {
  display: flex;
  gap: 8px;
  margin: 12px 0;
}

.mode-toggle button {
  flex: 1;
  padding: 12px;
  border: 2px solid var(--color-border);
  border-radius: 10px;
  background: var(--color-card);
  font-weight: 700;
}

.mode-toggle button.active-in {
  border-color: var(--color-ampel-green);
  background: #e8f5e9;
}

.mode-toggle button.active-out {
  border-color: var(--color-ampel-red);
  background: #fdecea;
}

/* Produktkarte (Einlagern-Flow) */
.product-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.qty-control {
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: center;
}

.qty-control button {
  width: var(--tap-min);
  height: var(--tap-min);
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-card);
  font-size: 1.4rem;
}

.qty-value { font-size: 1.4rem; font-weight: 700; min-width: 2ch; text-align: center; }

/* Bestand-Screen */
.stock-search {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  margin-bottom: 10px;
}

.category-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.chip {
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: var(--color-card);
  font-size: 0.85rem;
}

.chip.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.stock-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  margin-bottom: 8px;
}

.mhd-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.mhd-dot.mhd-green { background: var(--color-ampel-green); }
.mhd-dot.mhd-yellow { background: var(--color-ampel-yellow); }
.mhd-dot.mhd-red { background: var(--color-ampel-red); }
.mhd-dot.mhd-none { background: #bbb; }

.empty-hint { color: #666; text-align: center; padding: 24px 0; }