:root{
  --navy: #2C3E50;
  --softgray: #ECF0F1;
  --teal: #1ABC9C;
  --gold: #F1C40F;
  --slate: #7F8C8D;
  --coral: #E74C3C;

  --max-width: 980px;
  --radius: 12px;
  --transition: 0.25s ease;
}

/* Base */
* { box-sizing: border-box; }
html,body { height: 100%; margin: 0; }
body {
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background: var(--softgray);
  color: #111;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.45;
}

/* typography */
.site-title { font-family: "Montserrat", sans-serif; font-weight: 700; color: var(--navy); font-size: 2rem; }
.page-title { font-family: "Montserrat", sans-serif; font-weight: 700; font-size: 2rem; margin: 8px 0 0; color: #fff; text-align: center; }
.page-sub { font-family: "Inter", sans-serif; margin-top: 6px; color: rgba(255,255,255,0.9); text-align:center; font-size: 1rem; }

/* header */
.site-header {
  background: var(--navy);
  padding: 28px 16px;
  color: white;
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: block;
  text-align: center;
}
.logo-wrap { display:flex; align-items:center; justify-content:center; gap:12px; margin-bottom:10px; }
.logo { width:36px; height:36px; fill: var(--teal); color: var(--teal); }
.logo-large { text-align: center; margin-bottom: 16px; }
.logo-large svg {  fill:none; stroke:currentColor; color: var(--navy); justify: center; 
 display: block;           /* allows margin auto centering */
  width: 10vw;              /* 30% of viewport width */
  max-width: 220px;         /* prevents it getting too large on wide screens */
  height: auto;             /* keeps aspect ratio */
  margin: 0 auto;  }

/* main layout */
.main { padding: 28px 16px 48px; display:flex; justify-content:center; }
.quiz-wrap { width:100%; max-width: var(--max-width); }

/* quiz container */
.quiz-container {
  background: linear-gradient(145deg, #ffffff, #f5f9ff);
  padding: 28px;
  border-radius: var(--radius);
  box-shadow: 0 10px 25px rgba(44,62,80,0.08);
}

/* progress */
.progress-container { margin-bottom: 16px; }
.progress-top { display:flex; justify-content:space-between; align-items:center; font-size: 14px; color: var(--slate); margin-bottom:8px; }
.progress-track {
  width:100%;
  background: #e9eef2;
  height: 10px;
  border-radius: 999px;
  overflow:hidden;
}
.progress-track.small { height: 12px; margin-bottom:6px; }
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--teal) 0%, #16a085 100%);
  transition: width 0.45s ease;
}

/* quiz content */
.quiz-content .question-block { margin-bottom: 10px; }
.question-title { font-family: "Montserrat", sans-serif; font-weight:600; font-size: 18px; color: var(--navy); margin-bottom: 12px; }

.options { display:block; margin:0; padding:0; list-style:none; }
.option-item { margin-bottom:10px; }
.option-label {
  display:flex;
  align-items:flex-start;
  gap:12px;
  padding:12px;
  border-radius:10px;
  border:1px solid #d7dde2;
  cursor:pointer;
  transition: background var(--transition), border-color var(--transition), transform var(--transition);
  background: white;
}
.option-label:hover { background:#f5fbfb; transform: translateY(-2px); border-color: var(--teal);}
.option-label input[type="radio"] { margin-top:4px; transform: translateY(0); }

/* correct / wrong states */
.correct-answer { background: rgba(26,188,156,0.08) !important; border-color: var(--teal) !important; }
.wrong-answer { background: rgba(231,76,60,0.08) !important; border-color: var(--coral) !important; }

/* feedback */
.feedback {
  padding:12px;
  border-radius:10px;
  margin-top:12px;
}
.feedback.correct { border:1px solid var(--teal); background: rgba(26,188,156,0.06); color: var(--navy); }
.feedback.incorrect { border:1px solid var(--coral); background: rgba(231,76,60,0.06); color: var(--navy); }
.feedback .icon { width:20px; height:20px; vertical-align:middle; margin-right:8px; }

/* buttons */
.btn {
  display:inline-block;
  border:none;
  cursor:pointer;
  border-radius:10px;
  padding:10px 16px;
  font-weight:600;
  font-family: "Inter", sans-serif;
  transition: transform var(--transition), opacity var(--transition);
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--teal);
  color: #fff;
}
.btn-primary:hover { opacity: .95; transform: scale(1.02); }

/* result card */
.result-card {
  background: #fff;
  margin-top: 16px;
  padding: 18px;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(44,62,80,0.06);
  transform: translateY(12px);
  opacity: 0;
  transition: transform .35s ease, opacity .35s ease;
}
.result-card.show { transform: translateY(0); opacity: 1; }
.hidden { display: none; }

.results-title { font-family: "Montserrat", sans-serif; font-size: 20px; font-weight:700; color: var(--navy); text-align:center; margin-bottom:12px; }
.final-score { font-family: "Montserrat", sans-serif; font-size: 36px; color: var(--teal); text-align:center; font-weight:700; margin-bottom:8px;}
.result-message { text-align:center; margin-bottom:12px; font-size: 15px; color: var(--navy); }

/* review list */
.review-section { margin-top:18px; }
.review-section h3 { font-family: "Montserrat", sans-serif; margin-bottom:12px; color: var(--navy); }
.review-list .review-item { padding:12px; border-radius:10px; border:1px solid #e6e9ec; margin-bottom:10px; background:#fff; }
.review-item.correct { border-color: var(--teal); background: rgba(26,188,156,0.05); }
.review-item.incorrect { border-color: var(--coral); background: rgba(231,76,60,0.05); }

.final-progress-wrap { margin-top:12px; text-align:center; }
.final-count { font-size:13px; color:var(--slate); margin-top:8px; }

/* responsive */
@media (min-width: 720px) {
  .quiz-container { padding: 36px; }
  .page-title { font-size: 36px; }
}