:root {
  --color-bg: #f6f7f9;
  --color-panel: #ffffff;
  --color-border: #e3e6ec;
  --color-text: #1a1d23;
  --color-text-dim: #667085;
  --color-beecoming: #f5c518;
  --color-sdbinfo: #0f9aa4;
  --color-correct: #1f9d55;
  --color-incorrect: #d64545;
  --radius: 16px;
  --max-width: 880px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

#progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 4px;
  width: 0%;
  background: linear-gradient(90deg, var(--color-beecoming), var(--color-sdbinfo));
  z-index: 200;
  transition: width 80ms linear;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-border);
  padding: 14px 20px;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
}

.brand-link {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 42px;
}

.brand-link img {
  height: 42px;
  width: auto;
  max-width: 160px;
  object-fit: contain;
  display: block;
}

.brand-link .logo-fallback {
  display: none;
  align-items: center;
  height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.95rem;
  color: #1a1d23;
  background: var(--fallback-color, #eee);
}

.brand-separator {
  color: var(--color-text-dim);
  font-size: 20px;
  user-select: none;
}

.header-title {
  text-align: center;
  width: 100%;
  margin-top: 6px;
}
.header-title h1 { font-size: 1.2rem; margin: 0; }
.header-title p { margin: 2px 0 0; color: var(--color-text-dim); font-size: 0.88rem; }

.quick-nav {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 60;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.nav-pill {
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 14px rgba(0,0,0,0.08);
  color: var(--color-text);
  padding: 9px 16px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
}
.nav-pill:hover { border-color: var(--color-sdbinfo); }

main { max-width: var(--max-width); margin: 0 auto; padding: 30px 20px 110px; }

.section-title {
  margin: 54px 0 22px;
  padding-bottom: 10px;
  border-bottom: 3px solid var(--color-border);
  font-size: 1.4rem;
}
.section-title.cyber { border-color: var(--color-incorrect); }
.section-title.ia { border-color: var(--color-sdbinfo); }

.quiz-card {
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 20px;
  overflow: hidden;
  box-shadow: 0 2px 10px rgba(16, 24, 40, 0.04);
}

.card-header {
  padding: 20px 22px;
  cursor: pointer;
}
.card-header:hover { background: #fafbfc; }

.card-header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.badge {
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: 999px;
  color: #fff;
  font-weight: 700;
  white-space: nowrap;
}
.badge.cyber { background: var(--color-incorrect); }
.badge.ia { background: var(--color-sdbinfo); }

.chevron {
  color: var(--color-text-dim);
  font-size: 0.9rem;
  transition: transform 200ms ease;
  flex-shrink: 0;
}
.quiz-card.open .chevron { transform: rotate(180deg); }

.card-header h3 {
  margin: 0;
  font-size: 1.12rem;
  font-weight: 700;
  line-height: 1.4;
}

.media-zone {
  position: relative;
  width: 96px;
  height: 96px;
  min-width: 96px;
  border-radius: 12px;
  overflow: hidden;
  background: #f1f3f6;
  margin-top: 4px;
}
.media-zone .icon-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.media-zone .icon-fallback svg { width: 44px; height: 44px; }
.media-zone.cyber .icon-fallback { background: rgba(214, 69, 69, 0.1); }
.media-zone.cyber .icon-fallback svg { color: var(--color-incorrect); }
.media-zone.ia .icon-fallback { background: rgba(15, 154, 164, 0.1); }
.media-zone.ia .icon-fallback svg { color: var(--color-sdbinfo); }

.answer-image {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  cursor: zoom-in;
}

.card-header-body {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 0 22px 20px;
}

.option {
  text-align: left;
  background: #fafbfc;
  border: 1.5px solid var(--color-border);
  color: var(--color-text);
  padding: 12px 16px;
  border-radius: 12px;
  cursor: pointer;
  font-size: 0.98rem;
  transition: border-color 150ms ease, background 150ms ease, transform 100ms ease;
}
.option:hover:not(:disabled) { border-color: var(--color-sdbinfo); transform: translateX(2px); }
.option:disabled { cursor: default; }
.option.correct { border-color: var(--color-correct); background: rgba(31, 157, 85, 0.08); font-weight: 600; }
.option.incorrect { border-color: var(--color-incorrect); background: rgba(214, 69, 69, 0.08); }

.answer-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 280ms ease;
}
.quiz-card.open .answer-panel { grid-template-rows: 1fr; }
.answer-panel > .inner { min-height: 0; overflow: hidden; }

.answer-content {
  padding: 4px 22px 22px;
  border-top: 1px dashed var(--color-border);
  margin-top: 6px;
}

.correct-line { font-weight: 700; margin: 14px 0 8px; color: var(--color-correct); }
.explanation { color: var(--color-text-dim); margin: 0 0 14px; }

.source-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--color-sdbinfo);
  background: rgba(15, 154, 164, 0.08);
  border: 1px solid rgba(15, 154, 164, 0.25);
  padding: 8px 14px;
  border-radius: 999px;
  text-decoration: none;
}
.source-link:hover { background: rgba(15, 154, 164, 0.16); }

.reset-btn {
  display: block;
  margin-top: 14px;
  background: none;
  border: none;
  color: var(--color-text-dim);
  font-size: 0.82rem;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
}

#lightbox {
  position: fixed;
  inset: 0;
  background: rgba(15, 17, 21, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  cursor: zoom-out;
}
#lightbox[hidden] { display: none; }
#lightbox img {
  max-width: 92vw;
  max-height: 92vh;
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

footer {
  border-top: 1px solid var(--color-border);
  padding: 34px 20px 60px;
  text-align: center;
  color: var(--color-text-dim);
  font-size: 0.85rem;
}
footer .footer-logos {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 28px;
  margin-bottom: 16px;
}
footer .footer-logos img { height: 34px; width: auto; max-width: 130px; object-fit: contain; }
footer .footer-logos .logo-fallback { height: 34px; padding: 0 14px; }

@media (max-width: 520px) {
  .card-header-body { flex-direction: column; }
  .media-zone { width: 100%; height: 140px; }
  .brand-link img { height: 32px; }
  footer .footer-logos img { height: 26px; }
}