:root {
  --blue: #0057a3;
  --blue-dark: #003d73;
  --green: #1c8a4c;
  --red: #c0392b;
  --amber: #b8860b;
  --bg: #f4f6f8;
  --card: #ffffff;
  --text: #1a2733;
  --muted: #63737f;
  --border: #dde3e8;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

header.app-header {
  background: var(--blue);
  color: white;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header.app-header h1 {
  font-size: 1.05rem;
  margin: 0;
  font-weight: 600;
}

header.app-header .sub {
  font-size: 0.8rem;
  opacity: 0.85;
}

main {
  max-width: 780px;
  margin: 0 auto;
  padding: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 16px;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  background: var(--blue);
  color: white;
}

button.secondary {
  background: white;
  color: var(--blue);
  border: 1px solid var(--blue);
}

button:disabled { opacity: 0.5; cursor: not-allowed; }

input, select {
  font: inherit;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid var(--border);
  width: 100%;
}

label { font-size: 0.85rem; color: var(--muted); display: block; margin-bottom: 4px; }

.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--border); font-size: 0.92rem; }
th { color: var(--muted); font-weight: 600; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.02em; }

.badge {
  display: inline-block;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
}
.badge.unbekannt { background: #eceff1; color: var(--muted); }
.badge.anwesend { background: #e2f4e9; color: var(--green); }
.badge.abwesend_manuell { background: #fdeceb; color: var(--red); }
.badge.abwesend_urlaub { background: #fff4dc; color: var(--amber); }
.badge.entschuldigt { background: #eaf1fb; color: var(--blue); }

.btn-mini { padding: 5px 9px; font-size: 0.78rem; border-radius: 6px; }

#reader { width: 100%; max-width: 420px; margin: 0 auto; }

.hint { color: var(--muted); font-size: 0.85rem; }

.flash { padding: 10px 14px; border-radius: 8px; margin-bottom: 12px; font-size: 0.9rem; }
.flash.ok { background: #e2f4e9; color: var(--green); }
.flash.error { background: #fdeceb; color: var(--red); }

.center { text-align: center; }

/* Kursübersicht: Matrix Teilnehmer × Kurstage */
.matrix-wrap { overflow-x: auto; }
table.matrix { border-collapse: collapse; }
table.matrix th, table.matrix td { padding: 6px 10px; border-bottom: 1px solid var(--border); white-space: nowrap; }
table.matrix thead th.date-col { background: var(--blue); color: white; text-align: center; font-weight: 600; }
table.matrix thead th.date-col .hint { color: rgba(255,255,255,0.85); }
.person-col { position: sticky; left: 0; background: var(--card); text-align: left; z-index: 1; box-shadow: 1px 0 0 var(--border); }
thead .person-col { background: var(--blue); color: white; z-index: 2; }

.count-badges { display: flex; gap: 3px; justify-content: center; margin-top: 4px; }
.count-badge { min-width: 18px; padding: 1px 5px; border-radius: 5px; font-size: 0.7rem; font-weight: 700; color: white; text-align: center; }
.count-badge.anwesend { background: var(--green); }
.count-badge.abwesend_manuell { background: var(--red); }
.count-badge.abwesend_urlaub { background: var(--amber); }

.pill-group { display: flex; gap: 3px; }
.pill {
  border: 1px solid var(--border);
  background: white;
  font-size: 0.68rem;
  padding: 4px 7px;
  border-radius: 5px;
  cursor: pointer;
  color: var(--muted);
}
.pill.active.anwesend { background: var(--green); border-color: var(--green); color: white; }
.pill.active.abwesend_manuell { background: var(--red); border-color: var(--red); color: white; }
.pill.active.abwesend_urlaub { background: var(--amber); border-color: var(--amber); color: white; }
.pill.active.entschuldigt { background: var(--blue); border-color: var(--blue); color: white; }

/* Tab-Navigation */
nav.tabs { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
nav.tabs .tab-btn {
  background: white;
  color: var(--blue);
  border: 1px solid var(--blue);
  padding: 10px 16px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
}
nav.tabs .tab-btn.active { background: var(--blue); color: white; }

/* Live-Anzeige (zweiter Monitor) */
.anzeige-course { margin-bottom: 28px; }
.anzeige-course h2 { margin-bottom: 4px; }
.anzeige-columns { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; margin-top: 14px; }
.anzeige-col { border-radius: 12px; padding: 14px; background: var(--card); border: 2px solid var(--border); }
.anzeige-col h3 { margin: 0 0 10px 0; font-size: 1.1rem; display:flex; justify-content:space-between; }
.anzeige-col.unbekannt { border-color: var(--border); }
.anzeige-col.anwesend { border-color: var(--green); }
.anzeige-col.entschuldigt { border-color: var(--blue); }
.anzeige-col.abwesend_urlaub { border-color: var(--amber); }
.anzeige-col.abwesend_manuell { border-color: var(--red); }
.anzeige-col ul { list-style: none; margin: 0; padding: 0; }
.anzeige-col li { padding: 6px 0; font-size: 1.15rem; border-bottom: 1px solid var(--border); }
.anzeige-col li:last-child { border-bottom: none; }
.anzeige-empty { color: var(--muted); font-size: 1rem; }
.anzeige-clock { font-size: 1rem; opacity: 0.85; }

/* Scan-Popup auf der Live-Anzeige: großer Hinweis bei jedem Scan */
#scan-popup {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px;
  font-size: 6rem;
  font-weight: 800;
  color: white;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}
#scan-popup.show { opacity: 1; }
#scan-popup.ok { background: var(--green); }
#scan-popup.error { background: var(--red); font-size: 3.2rem; }

@media (max-width: 900px) {
  #scan-popup.ok { font-size: 3.5rem; }
  #scan-popup.error { font-size: 2rem; }
}