:root {
  color-scheme: light;
  --bg: #f4f6fb;
  --panel: #ffffff;
  --panel-alt: #eef3ff;
  --border: #d8e0f0;
  --text: #172033;
  --muted: #5c6b86;
  --primary: #3158d3;
  --primary-dark: #2444a7;
  --success-bg: #e7f7ee;
  --success-text: #1d7040;
  --danger-bg: #fdecec;
  --danger-text: #a23030;
  --warning-bg: #fff7e8;
  --warning-text: #966500;
  --shadow: 0 18px 48px rgba(22, 37, 66, 0.08);
  --radius: 18px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family:
    Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: linear-gradient(180deg, #f8f9fd 0%, var(--bg) 100%);
  color: var(--text);
}

button,
input,
textarea,
select {
  font: inherit;
}

.page-shell {
  width: min(1100px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 32px 0 56px;
}

.site-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
  margin-bottom: 24px;
}

.site-header h1 {
  margin: 6px 0 0;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  line-height: 1.1;
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  color: var(--primary);
  font-weight: 700;
}

.app-layout {
  display: grid;
  gap: 24px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}

.panel h2,
.panel h3,
.panel h4,
.panel p {
  margin-top: 0;
}

.centered-panel {
  min-height: 280px;
  display: grid;
  place-items: center;
  text-align: center;
  gap: 12px;
}

.muted {
  color: var(--muted);
}

.primary-button,
.ghost-button,
.option-button {
  border-radius: 12px;
  border: 1px solid transparent;
  padding: 12px 18px;
  cursor: pointer;
  transition:
    transform 0.15s ease,
    background-color 0.15s ease,
    border-color 0.15s ease,
    box-shadow 0.15s ease;
}

.primary-button {
  background: var(--primary);
  color: #fff;
  font-weight: 700;
}

.primary-button:hover,
.primary-button:focus-visible {
  background: var(--primary-dark);
}

.ghost-button {
  background: transparent;
  border-color: var(--border);
  color: var(--text);
}

.ghost-button:hover,
.ghost-button:focus-visible {
  background: var(--panel-alt);
}

.option-button {
  width: 100%;
  text-align: left;
  background: #fff;
  border-color: var(--border);
  color: var(--text);
}

.option-button:hover,
.option-button:focus-visible {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(49, 88, 211, 0.12);
}

.option-button.selected {
  border-color: var(--primary);
  background: rgba(49, 88, 211, 0.08);
}

.option-button.correct {
  border-color: #249f5d;
  background: var(--success-bg);
}

.option-button.incorrect {
  border-color: #db5353;
  background: var(--danger-bg);
}

.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.stack {
  display: grid;
  gap: 16px;
}

.intro-card {
  display: grid;
  gap: 18px;
}

.status-chip {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 700;
  background: var(--panel-alt);
  color: var(--primary-dark);
}

.catalog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.test-card {
  display: grid;
  gap: 16px;
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
  background: #fff;
}

.test-card.unavailable {
  opacity: 0.75;
}

.test-card h3 {
  margin-bottom: 6px;
}

.test-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 0.92rem;
  color: var(--muted);
}

.pill {
  display: inline-flex;
  align-items: center;
  padding: 5px 10px;
  border-radius: 999px;
  background: #f2f5fb;
  color: var(--text);
}

.reading-layout {
  display: grid;
  gap: 16px;
}

.reading-layout .text-block {
  background: #fafbff;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px;
}

.reading-layout .text-block p {
  line-height: 1.72;
  margin-bottom: 1rem;
}

.question-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.progress {
  font-weight: 700;
  color: var(--primary-dark);
}

.options-grid {
  display: grid;
  gap: 12px;
}

.question-fieldset {
  margin: 0;
  padding: 0;
  border: 0;
  min-width: 0;
}

.question-legend {
  margin-bottom: 14px;
  font-size: 1.12rem;
  font-weight: 700;
}

.option-card {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 12px;
  width: 100%;
  text-align: left;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  cursor: pointer;
  transition:
    transform 0.15s ease,
    background-color 0.15s ease,
    border-color 0.15s ease,
    box-shadow 0.15s ease;
}

.option-card:hover,
.option-card:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(49, 88, 211, 0.12);
}

.option-card.selected {
  border-color: var(--primary);
  background: rgba(49, 88, 211, 0.08);
}

.option-card.correct {
  border-color: #249f5d;
  background: var(--success-bg);
}

.option-card.incorrect {
  border-color: #db5353;
  background: var(--danger-bg);
}

.option-input {
  margin-top: 3px;
}

.option-label {
  line-height: 1.5;
}

.feedback-panel {
  display: grid;
  gap: 14px;
  border-radius: 16px;
  padding: 18px;
}

.feedback-panel.correct {
  background: var(--success-bg);
  color: var(--success-text);
}

.feedback-panel.incorrect {
  background: var(--danger-bg);
  color: var(--danger-text);
}

.feedback-panel p:last-child {
  margin-bottom: 0;
}

.tip-box {
  border-radius: 14px;
  padding: 14px 16px;
  background: var(--warning-bg);
  color: var(--warning-text);
}

.final-grid {
  display: grid;
  gap: 20px;
}

.score-card {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
}

.score-value {
  font-size: clamp(2.3rem, 6vw, 3.2rem);
  font-weight: 800;
  color: var(--primary-dark);
  line-height: 1;
}

.two-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.list-card ul {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 8px;
}

.inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (max-width: 720px) {
  .page-shell {
    width: min(100vw - 20px, 1100px);
    padding-top: 20px;
  }

  .site-header {
    flex-direction: column;
  }

  .panel {
    padding: 18px;
  }
}