/* Base theme variables */
:root {
  --accent: #2563eb;
  --accent-soft: #dbeafe;
  --border: #d0d7e2;
  --bg: #f1f5f9;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #475569;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

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

h1 {
  font-size: 1.9rem;
  margin: 0;
}

.lead {
  margin: 0 0 24px;
  color: var(--muted);
  line-height: 1.5;
}

.top-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 24px;
}

.top-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--accent);
  text-decoration: none;
}

.top-link::before {
  content: ' ';
  font-size: 0.85rem;
}

.top-link:hover,
.top-link:focus-visible {
  text-decoration: underline;
  outline: none;
}

.lang-switcher {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--border);
  border-radius: 999px;
  box-shadow: 0 6px 18px rgba(15, 23, 42, 0.08);
}

.lang-button {
  border: none;
  background: transparent;
  color: var(--muted);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 6px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease;
}

.lang-button.active {
  background: var(--accent);
  color: #ffffff;
}

.lang-button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.card {
  background: var(--card);
  border-radius: 16px;
  border: 1px solid var(--border);
  padding: 28px;
  box-shadow: 0 20px 45px rgba(15, 23, 42, 0.08);
  margin-bottom: 24px;
}

.card h2 {
  margin-top: 0;
  margin-bottom: 12px;
}

.question-text {
  font-size: 1.1rem;
  margin-bottom: 20px;
  line-height: 1.6;
}

.question-context {
  margin-bottom: 16px;
  color: var(--muted);
  line-height: 1.5;
}

.question-layout {
  display: grid;
  gap: 18px;
}

.question-layout.has-media {
  grid-template-columns: minmax(0, 1.2fr) minmax(260px, 0.8fr);
  align-items: start;
}

.question-column {
  display: grid;
  gap: 12px;
}

.question-media {
  align-self: stretch;
}

.step-media {
  margin: 0;
  padding: 0;
  border: 1px solid rgba(37, 99, 235, 0.16);
  border-radius: 14px;
  background: #f8fafc;
  display: flex;
  flex-direction: column;
  gap: 10px;
  height: 100%;
}

.step-media.is-placeholder {
  border-style: dashed;
  border-color: rgba(148, 163, 184, 0.6);
  background: #fff;
}

.step-media-frame {
  position: relative;
  width: 100%;
  flex: 1 1 auto;
  min-height: 220px;
  border-radius: 13px;
  overflow: hidden;
  background: radial-gradient(circle at 26% 18%, rgba(37, 99, 235, 0.12), transparent 52%),
    radial-gradient(circle at 68% 62%, rgba(14, 165, 233, 0.12), transparent 58%),
    #e2e8f0;
  display: grid;
  place-items: center;
}

.step-media-frame.is-portrait {
  aspect-ratio: 9 / 16;
}

.step-media img,
.step-media video,
.step-media iframe {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  border: 0;
  border-radius: 13px;
  background: #000;
}

.step-media video,
.step-media iframe {
  background: #0f172a;
}

.step-media-caption {
  margin: 0;
  padding: 0 12px 12px;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.45;
}

.step-media-placeholder {
  padding: 0 18px;
  text-align: center;
  font-size: 0.95rem;
  line-height: 1.45;
  color: #94a3b8;
}

.step-description {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.5;
}

.step-emphasis {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--text);
}

.options {
  display: grid;
  gap: 14px;
}

.option-button {
  border: 1px solid rgba(37, 99, 235, 0.3);
  background: var(--accent-soft);
  color: var(--text);
  border-radius: 12px;
  padding: 14px 18px;
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.option-button:hover,
.option-button:focus {
  outline: none;
  transform: translateY(-1px);
  box-shadow: 0 12px 18px rgba(37, 99, 235, 0.15);
  border-color: var(--accent);
}

.option-label {
  font-weight: 600;
}

.option-note {
  font-size: 0.9rem;
  color: var(--muted);
  font-weight: 400;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.ghost-button {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  padding: 10px 18px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 0.95rem;
  transition: background 0.18s ease, border-color 0.18s ease;
}

.ghost-button:hover,
.ghost-button:focus {
  outline: none;
  background: #e2e8f0;
  border-color: #94a3b8;
}

.history-card h2 {
  margin-top: 0;
  margin-bottom: 16px;
}

.history-placeholder {
  margin: 0;
  color: #94a3b8;
  font-style: italic;
}

.history-list {
  list-style: decimal inside;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  color: var(--muted);
}

.history-item strong {
  display: block;
  color: var(--text);
  margin-top: 4px;
  font-size: 0.98rem;
}

.material-grid {
  display: grid;
  gap: 18px;
}

.material-card {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 20px;
  background: #f8fafc;
}

.material-card h3 {
  margin: 0 0 12px;
  font-size: 1.1rem;
}

.material-prop {
  margin: 4px 0;
  font-size: 0.95rem;
  line-height: 1.5;
}

.material-prop span {
  font-weight: 600;
  color: var(--text);
}

.info-card {
  border: 1px solid rgba(37, 99, 235, 0.25);
  border-radius: 14px;
  padding: 16px 18px;
  background: #f8fafc;
  display: grid;
  gap: 10px;
}

.info-card h4 {
  margin: 0;
  font-size: 1.05rem;
}

.info-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.info-card a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

.info-card a:hover,
.info-card a:focus-visible {
  text-decoration: underline;
}

.info-hint {
  margin: 10px 0 0;
  font-size: 0.92rem;
  color: #94a3b8;
}

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

  .question-media {
    order: -1;
  }
}

@media (max-width: 640px) {
  .card {
    padding: 22px;
  }

  .option-button {
    padding: 12px 14px;
  }

  .material-card {
    padding: 16px;
  }
}