:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --ink: #1c2530;
  --muted: #6b7683;
  --brand: #1e5eff;
  --brand-dark: #1544c0;
  --green: #1a9a54;
  --green-bg: #e6f6ec;
  --red: #d23b48;
  --red-bg: #fdeaec;
  --border: #e2e7ef;
  --shadow: 0 2px 10px rgba(20, 40, 80, 0.06);
  --radius: 14px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}

.wrap { max-width: 820px; margin: 0 auto; padding: 0 18px; }

.site-header {
  background: linear-gradient(135deg, var(--brand), #3b7bff);
  color: #fff;
  padding: 28px 0 32px;
}
.site-header h1 { margin: 0; font-size: 1.9rem; }
.tagline { margin: 6px 0 0; opacity: 0.92; }

main { padding: 26px 0 40px; }
.view { animation: fade 0.25s ease; }
.hidden { display: none; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

h2 { font-size: 1.4rem; margin: 0 0 4px; }
.muted { color: var(--muted); }

/* Kaflaval */
.chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 14px;
  margin-top: 18px;
}
.chapter-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease;
  text-align: left;
}
.chapter-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 22px rgba(20, 40, 80, 0.12);
  border-color: var(--brand);
}
.chapter-card .num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px; height: 34px;
  border-radius: 9px;
  background: var(--brand);
  color: #fff;
  font-weight: 700;
  margin-bottom: 10px;
}
.chapter-card h3 { margin: 0 0 6px; font-size: 1.05rem; }
.chapter-card .count { color: var(--muted); font-size: 0.9rem; }

/* Quiz */
.quiz-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  gap: 12px;
}
.progress-info { color: var(--muted); font-size: 0.92rem; white-space: nowrap; }
.progress-bar {
  height: 8px;
  background: #e6eaf2;
  border-radius: 99px;
  overflow: hidden;
  margin: 12px 0 20px;
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--brand);
  border-radius: 99px;
  transition: width 0.25s ease;
}

.question {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  margin-bottom: 14px;
  box-shadow: var(--shadow);
}
.q-head { display: flex; gap: 12px; align-items: flex-start; }
.q-num {
  flex: 0 0 auto;
  font-weight: 700;
  color: var(--brand);
  min-width: 28px;
}
.q-text { margin: 0; }
.q-sign {
  margin: 12px 0 4px;
  text-align: center;
}
.q-sign img {
  max-width: 100%;
  max-height: 150px;
  border-radius: 8px;
  background: #fafbfd;
  border: 1px solid var(--border);
  padding: 6px;
}

.choices { display: flex; gap: 10px; margin-top: 14px; }
.choice {
  flex: 1;
  position: relative;
}
.choice input { position: absolute; opacity: 0; pointer-events: none; }
.choice label {
  display: block;
  text-align: center;
  padding: 11px 8px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  user-select: none;
  transition: all 0.12s ease;
  background: #fbfcfe;
}
.choice label:hover { border-color: var(--brand); }
.choice.ret input:checked + label { background: var(--green-bg); border-color: var(--green); color: var(--green); }
.choice.rangt input:checked + label { background: var(--red-bg); border-color: var(--red); color: var(--red); }

/* Buttons */
.quiz-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 22px; }
.btn {
  font: inherit;
  font-weight: 600;
  border-radius: 10px;
  padding: 12px 20px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all 0.12s ease;
}
.btn.primary { background: var(--brand); color: #fff; }
.btn.primary:hover { background: var(--brand-dark); }
.btn.ghost { background: transparent; border-color: var(--border); color: var(--ink); }
.btn.ghost:hover { border-color: var(--brand); color: var(--brand); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Niðurstöður */
.score-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
  text-align: center;
  box-shadow: var(--shadow);
  margin-bottom: 22px;
}
.score-ring {
  --p: 0;
  width: 130px; height: 130px;
  border-radius: 50%;
  margin: 0 auto 14px;
  display: grid;
  place-items: center;
  background: conic-gradient(var(--ring-color) calc(var(--p) * 1%), #e6eaf2 0);
}
.score-ring .inner {
  width: 104px; height: 104px;
  border-radius: 50%;
  background: var(--card);
  display: grid;
  place-items: center;
  font-size: 1.7rem;
  font-weight: 800;
}
.score-card h2 { margin: 0 0 4px; }
.badge {
  display: inline-block;
  padding: 5px 14px;
  border-radius: 99px;
  font-weight: 700;
  font-size: 0.9rem;
  margin-top: 8px;
}
.badge.pass { background: var(--green-bg); color: var(--green); }
.badge.fail { background: var(--red-bg); color: var(--red); }

.result-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 5px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 10px;
}
.result-item.ok { border-left-color: var(--green); }
.result-item.no { border-left-color: var(--red); }
.result-item .r-top { display: flex; gap: 10px; align-items: flex-start; }
.result-item .r-num { font-weight: 700; color: var(--muted); min-width: 26px; }
.result-item .r-mark { margin-left: auto; font-size: 1.15rem; }
.result-item .r-sign img {
  max-height: 110px; max-width: 100%;
  border: 1px solid var(--border); border-radius: 8px; padding: 5px; background: #fafbfd;
  margin: 10px 0 2px;
}
.result-item .r-answers { margin-top: 8px; font-size: 0.92rem; }
.result-item .r-answers .given.wrong { color: var(--red); font-weight: 600; }
.result-item .r-answers .correct { color: var(--green); font-weight: 600; }
.result-item .r-answers .none { color: var(--muted); font-style: italic; }

.site-footer { padding: 20px 0 40px; }
.site-footer .muted { font-size: 0.85rem; }

@media (max-width: 480px) {
  .choices { flex-direction: row; }
  .site-header h1 { font-size: 1.6rem; }
}