:root {
  --orange: #FF8C42;
  --gruen: #5FD068;
  --dunkelgrau: #2C3E50;
  --hellgrau: #F8F9FA;
  --rand: #DDD;
  --fehler: #E74C3C;
}

* {
  box-sizing: border-box;
}

body {
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: linear-gradient(135deg, var(--hellgrau) 0%, #FFF 100%);
  margin: 0;
  padding: 0;
  color: var(--dunkelgrau);
}

.container {
  max-width: 500px;
  margin: 0 auto;
  padding: 16px;
}

/* Header mit Logo */
header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 3px solid var(--orange);
}

header img {
  width: 48px;
  height: 48px;
  object-fit: contain;
}

header h1 {
  margin: 0;
  font-size: 1.6rem;
  color: var(--dunkelgrau);
}

header .subtitle {
  font-size: 0.8rem;
  color: #999;
  margin-top: 2px;
}

/* Überschriften */
h1 {
  font-size: 1.5rem;
  margin-bottom: 4px;
  color: var(--dunkelgrau);
}

h2 {
  font-size: 1.2rem;
  margin-top: 20px;
  margin-bottom: 12px;
  color: var(--orange);
}

p.subtitle {
  color: #777;
  margin-top: 0;
  margin-bottom: 16px;
  font-size: 0.95rem;
}

/* Karten */
.card {
  background: #fff;
  border: 1px solid var(--rand);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
  transition: box-shadow 0.2s ease;
}

.card:hover {
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.card h2 {
  margin-top: 0;
}

/* Formular-Elemente */
label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--dunkelgrau);
  margin-top: 16px;
  margin-bottom: 6px;
}

input[type="text"],
input[type="date"],
select,
textarea {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--rand);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  transition: border-color 0.2s ease;
}

input[type="text"]:focus,
input[type="date"]:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 140, 66, 0.1);
}

textarea {
  resize: vertical;
  min-height: 80px;
}

/* Radio-Button-Gruppen */
.radio-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 8px;
}

.radio-group label {
  flex: 0 1 calc(20% - 7px);
  min-width: 60px;
  margin: 0;
  text-align: center;
  border: 2px solid var(--rand);
  border-radius: 8px;
  padding: 8px 4px;
  cursor: pointer;
  font-weight: normal;
  font-size: 0.85rem;
  transition: all 0.2s ease;
}

.radio-group input[type="radio"] {
  display: none;
}

.radio-group input[type="radio"]:checked + span {
  font-weight: 700;
}

.radio-group label:has(input:checked) {
  background: var(--orange);
  color: #fff;
  border-color: var(--orange);
}

/* Buttons */
button,
a.button {
  display: inline-block;
  background: linear-gradient(135deg, var(--orange) 0%, #FF7A1F 100%);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 12px 20px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  width: 100%;
  text-align: center;
  margin-top: 12px;
  transition: transform 0.2s, box-shadow 0.2s;
}

button:active,
a.button:active {
  transform: scale(0.98);
}

button:hover,
a.button:hover {
  box-shadow: 0 4px 12px rgba(255, 140, 66, 0.3);
}

a.button.secondary,
button.secondary {
  background: #fff;
  color: var(--orange);
  border: 2px solid var(--orange);
}

a.button.secondary:hover,
button.secondary:hover {
  background: var(--hellgrau);
}

/* Session-ID Badge */
.session-id-badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--orange) 0%, var(--gruen) 100%);
  color: #fff;
  border-radius: 8px;
  padding: 8px 12px;
  font-family: "Courier New", monospace;
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 1px;
}

/* Hinweise & Meldungen */
.hinweis {
  font-size: 0.85rem;
  color: #666;
  background: var(--hellgrau);
  border-left: 4px solid var(--orange);
  border-radius: 6px;
  padding: 12px;
  margin-top: 12px;
}

.success {
  background: #E8F8F5;
  border-left-color: var(--gruen);
  color: #27AE60;
}

.error {
  background: #FADBD8;
  border-left-color: var(--fehler);
  color: var(--fehler);
}

/* Empty State */
.empty-state {
  text-align: center;
  color: #999;
  padding: 40px 20px;
}

.empty-state p {
  margin: 12px 0;
}

/* Session-Liste */
ul.session-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

ul.session-list li {
  border: 1px solid var(--rand);
  border-radius: 8px;
  padding: 12px;
  margin-bottom: 8px;
  background: #fff;
  cursor: pointer;
  transition: all 0.2s ease;
}

ul.session-list li:hover {
  background: var(--hellgrau);
  border-color: var(--orange);
}

ul.session-list .meta {
  color: #999;
  font-size: 0.8rem;
  margin-top: 4px;
}

/* Meta-Informationen */
.meta {
  color: #999;
  font-size: 0.85rem;
}

.meta strong {
  color: var(--dunkelgrau);
}

/* Responsive */
@media (max-width: 480px) {
  .container {
    padding: 12px;
  }

  header {
    flex-wrap: wrap;
  }

  .radio-group label {
    flex: 0 1 calc(33.333% - 6px);
  }
}

/* Ladeanzeige beim Absenden von Formularen */
@keyframes spin {
  to { transform: rotate(360deg); }
}

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
  margin-right: 8px;
}

button:disabled,
a.button.disabled {
  opacity: 0.75;
  cursor: not-allowed;
  pointer-events: none;
}