:root {
  --color-bg: #e9f7f4;
  --color-surface: #ffffff;
  --color-header: #055a4e;
  --color-header-text: #ffffff;
  --color-accent: #1b9a6d;
  --color-accent-soft: #d5f1e6;
  --color-border: #c3ded6;
  --color-text-main: #12302a;
  --color-text-muted: #4f6a63;
  --color-danger: #c62828;

  --radius-card: 12px;
  --shadow-soft: 0 6px 18px rgba(0, 0, 0, 0.06);
  --transition-fast: 0.16s ease-out;
}

* {
  box-sizing: border-box;
}

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

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-header {
  background: var(--color-header);
  color: var(--color-header-text);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.header-title-main {
  display: block;
  font-size: 1.2rem;
  font-weight: 600;
}

.header-title-sub {
  display: block;
  font-size: 0.85rem;
  opacity: 0.9;
}

.header-meta {
  display: inline-flex;
  gap: 16px;
  font-size: 0.85rem;
}

.meta-row {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.meta-label {
  opacity: 0.8;
}

.meta-value {
  font-weight: 600;
}

.app-main {
  flex: 1;
  display: flex;
  justify-content: center;
  padding: 16px;
}

.exam-shell {
  width: 100%;
  max-width: 1120px;
  background: var(--color-surface);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-soft);
  padding: 20px 20px 12px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.exam-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.3fr);
  gap: 20px;
}

.exam-image-column {
  border-right: 1px solid var(--color-border);
  padding-right: 16px;
}

.scenario-figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.scenario-image-placeholder {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: 10px;
  border: 1px dashed var(--color-border);
  background: repeating-linear-gradient(
      -45deg,
      #f3faf7,
      #f3faf7 10px,
      #e3f1eb 10px,
      #e3f1eb 20px
    );
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  text-align: center;
  padding: 12px;
}

.scenario-image-placeholder img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 10px;
}

.scenario-caption {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.exam-question-column {
  padding-left: 4px;
}

.question-card {
  background: #ffffff;
  border-radius: 10px;
  border: 1px solid var(--color-border);
  padding: 16px 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 260px;
}

.question-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 8px;
}

.question-title {
  font-size: 1.2rem;
  margin: 0 0 4px;
}

.question-context {
  font-size: 0.9rem;
  margin: 0;
  color: var(--color-text-muted);
}

.question-body {
  margin-top: 8px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.question-message {
  min-height: 1.2em;
  font-size: 0.85rem;
  color: var(--color-danger);
}

.intro-text,
.summary-text {
  font-size: 0.95rem;
  line-height: 1.5;
}

.options-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.option-item {
  border-radius: 10px;
  border: 1px solid var(--color-border);
  background: #ffffff;
  display: flex;
  align-items: stretch;
  cursor: pointer;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast),
    transform var(--transition-fast), background-color var(--transition-fast);
}

.option-item:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.06);
  transform: translateY(-1px);
}

.option-item[aria-checked="true"] {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

.option-input-wrapper {
  display: flex;
  align-items: center;
  padding: 10px 10px 10px 12px;
}

.option-radio {
  width: 22px;
  height: 22px;
  border-radius: 4px;
  border: 2px solid var(--color-border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-right: 10px;
  flex-shrink: 0;
  background: #ffffff;
  transition: border-color var(--transition-fast), background-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.option-item[aria-checked="true"] .option-radio {
  border-color: var(--color-accent);
  background: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-accent-soft);
}

.option-radio-icon {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background: #ffffff;
}

.option-content {
  padding: 10px 12px 10px 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.option-label {
  font-weight: 600;
  font-size: 0.95rem;
}

.option-description {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.option-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.option-chip {
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: #f7fbf9;
  color: var(--color-text-muted);
}

.exam-footer {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-top: 4px;
  border-top: 1px solid var(--color-border);
}

.exam-footer-spacer {
  flex: 1;
}

.nav-button {
  min-width: 110px;
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast),
    box-shadow var(--transition-fast), border-color var(--transition-fast),
    transform var(--transition-fast);
}

.nav-button-primary {
  background: var(--color-accent);
  color: #ffffff;
  border-color: var(--color-accent);
}

.nav-button-primary:hover {
  background: #157956;
  border-color: #157956;
  box-shadow: 0 4px 10px rgba(27, 154, 109, 0.5);
  transform: translateY(-1px);
}

.nav-button-secondary {
  background: #ffffff;
  color: var(--color-text-main);
  border-color: var(--color-border);
}

.nav-button-secondary:hover {
  border-color: var(--color-accent);
}

.nav-button:disabled {
  opacity: 0.5;
  cursor: default;
  box-shadow: none;
  transform: none;
}

.nav-button:focus-visible,
.option-item:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: 2px;
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}

.app-footer {
  padding: 8px 20px 16px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-align: center;
}

.impressum {
  margin-top: 4px;
}

.impressum a {
  color: var(--color-accent);
  text-decoration: none;
}

.impressum a:hover {
  text-decoration: underline;
}

.progress-bar {
  display: flex;
  gap: 6px;
  margin-top: 8px;
}

.progress-dot {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  background: #ffffff;
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast),
    color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.progress-dot:hover {
  border-color: var(--color-accent);
  transform: translateY(-1px);
}

.progress-dot-current {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #ffffff;
  box-shadow: 0 4px 10px rgba(27, 154, 109, 0.4);
}

.progress-dot-answered {
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
}

.progress-dot:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: 2px;
  box-shadow: 0 0 0 3px var(--color-accent-soft);
}

@media (max-width: 900px) {
  .exam-grid {
    grid-template-columns: 1fr;
  }

  .exam-image-column {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
    padding-right: 0;
    padding-bottom: 12px;
  }

  .exam-question-column {
    padding-left: 0;
  }

  .exam-shell {
    padding: 16px 12px 8px;
  }

  .app-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-button {
    flex: 1;
    min-width: auto;
  }
}

/* Intro Page Styles */
.intro-container {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  width: 100%;
  padding: 20px 0;
}

.intro-card {
  background: #ffffff;
  border-radius: var(--radius-card);
  border: 1px solid var(--color-border);
  padding: 32px;
  max-width: 720px;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.intro-header {
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 16px;
}

.intro-main-title {
  font-size: 2rem;
  margin: 0 0 8px;
  color: var(--color-header);
}

.intro-subtitle {
  font-size: 1.1rem;
  margin: 0;
  color: var(--color-text-muted);
  font-weight: 500;
}

.intro-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.intro-section {
  line-height: 1.6;
}

.intro-section h2 {
  font-size: 1.2rem;
  margin: 0 0 8px;
  color: var(--color-accent);
}

.intro-section p {
  margin: 0 0 12px;
  color: var(--color-text-main);
}

.intro-section p:last-child {
  margin-bottom: 0;
}

.intro-highlight {
  background: var(--color-accent-soft);
  padding: 16px;
  border-radius: 8px;
  border-left: 4px solid var(--color-accent);
}

.intro-footer {
  display: flex;
  justify-content: center;
  padding-top: 8px;
}

.nav-button-large {
  font-size: 1.1rem;
  padding: 14px 32px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

@media (max-width: 768px) {
  .intro-card {
    padding: 24px 20px;
  }

  .intro-main-title {
    font-size: 1.6rem;
  }

  .intro-subtitle {
    font-size: 1rem;
  }
}