:root{
  --bg:#f6f7fb; --card:#fff; --ink:#222; --muted:#6b7280; --ring:#e5e7eb;
  --brand:#2563eb; --brand-ink:#fff; --ok:#16a34a; --bad:#dc2626;
  --ok-bg:#e8f8ee; --bad-bg:#fdecec;
}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--ink)}
.container{max-width:1000px;margin:auto;padding:24px}
.site-header, .site-footer{background:#fff;border-bottom:1px solid var(--ring)}
.site-footer{border-top:1px solid var(--ring);border-bottom:none;text-align:center;padding:16px;color:var(--muted)}
.site-header{display:flex;gap:16px;align-items:center;justify-content:space-between;padding:12px 16px;position:sticky;top:0;z-index:10}
.brand{font-weight:800;color:var(--brand)}
.nav a{color:#374151;text-decoration:none;margin:0 6px;padding:8px 12px;border-radius:10px}
.nav a:hover{background:#eef2ff}
.nav a.active{background:var(--brand);color:var(--brand-ink)}
.hero{background:linear-gradient(0deg,#fff, #f8fafc);border:1px solid var(--ring);border-radius:16px;padding:28px}
.button{background:var(--brand);color:var(--brand-ink);border:none;border-radius:10px;padding:10px 14px;cursor:pointer;text-decoration:none;display:inline-block}
.button:hover{opacity:.95}
.button-secondary{background:#e5e7eb;color:#111}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px;margin-top:18px}
.card{background:var(--card);border:1px solid var(--ring);border-radius:14px;padding:16px}
.link{color:var(--brand);text-decoration:none}
.link:hover{text-decoration:underline}
.muted{color:var(--muted)}

/* Quiz page */
.q{background:#fff;border:1px solid var(--ring);border-radius:12px;padding:16px;margin:14px 0}
.q label{display:block;margin:6px 0;padding:8px;border-radius:8px;border:1px solid transparent}
.q input[type="radio"]{margin-right:8px}
.q.is-correct{box-shadow:0 0 0 2px #bbf7d0 inset}
.q.is-wrong{box-shadow:0 0 0 2px #fecaca inset}
.highlight-correct{background:var(--ok-bg)}
.explain{margin-top:8px;color:var(--muted);font-size:.95rem}
.hidden{display:none}
.actions{display:flex;gap:10px;margin-top:10px}
.result{margin-top:12px;background:#fff;border:1px dashed var(--ring);padding:12px;border-radius:10px}
.form{display:grid;gap:12px;max-width:520px}
.form label{display:grid;gap:6px}
.form input, .form textarea{padding:10px;border-radius:10px;border:1px solid var(--ring);background:#fff}



/* Quiz links section */
.quizzes {
  margin-top: 30px;
  padding: 20px;
  background: #fff;
  border: 1px solid var(--ring);
  border-radius: 14px;
}

.quiz-links {
  display: flex;
  gap: 16px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.quiz-card {
  flex: 1 1 160px;
  background: var(--brand);
  color: var(--brand-ink);
  text-decoration: none;
  padding: 14px 20px;
  border-radius: 12px;
  font-weight: 600;
  text-align: center;
  transition: background 0.2s ease-in-out;
}

.quiz-card:hover {
  background: #1d4ed8; /* darker shade of blue */
}


/* quizz css
*/

/* Quiz Styles - Colorful Edition */
.q {
  background: linear-gradient(135deg, #ffffff, #f9fafb);
  border: 2px solid var(--ring);
  border-radius: 14px;
  padding: 18px;
  margin: 18px 0;
  box-shadow: 0 3px 6px rgba(0,0,0,0.05);
  transition: transform 0.2s ease;
}
.q:hover {
  transform: scale(1.01);
}
.q h3 {
  margin-top: 0;
  color: #1e3a8a; /* navy blue */
}

.q label {
  display: block;
  margin: 6px 0;
  padding: 10px 12px;
  border-radius: 10px;
  border: 2px solid transparent;
  cursor: pointer;
  background: #f3f4f6;
  transition: all 0.2s ease;
  font-weight: 500;
}
.q input[type="radio"] {
  margin-right: 8px;
}
.q label:hover {
  background: #e0e7ff;
  border-color: #6366f1;
  color: #111;
}

/* Correct / Wrong highlights */
.is-correct {
  border: 2px solid #22c55e !important; /* green */
  background: #dcfce7 !important;
}
.is-wrong {
  border: 2px solid #ef4444 !important; /* red */
  background: #fee2e2 !important;
}
.highlight-correct {
  background: #bbf7d0 !important;
  border: 2px solid #16a34a !important;
}



/* Result Box quiz 2 */

/* Explanation text */





/* Explanations */
.explain {
  margin-top: 8px;
  font-size: 0.95rem;
  color: #374151;
  background: #fef9c3;
  border-left: 4px solid #facc15;
  padding: 8px 12px;
  border-radius: 6px;
}
.hidden { display:none; }

/* Buttons */
.actions {
  display: flex;
  gap: 12px;
  margin-top: 16px;
}
.button {
  background: linear-gradient(135deg, #2563eb, #4f46e5);
  color: white;
  border: none;
  border-radius: 12px;
  padding: 10px 16px;
  cursor: pointer;
  text-decoration: none;
  font-weight: bold;
  box-shadow: 0 2px 4px rgba(0,0,0,0.15);
  transition: transform 0.2s ease, background 0.3s ease;
}
.button:hover {
  transform: translateY(-2px);
  background: linear-gradient(135deg, #1e40af, #3730a3);
}
.button-secondary {
  background: #e5e7eb;
  color: #111;
}
.result {
  margin-top: 14px;
  background: #ecfdf5;
  border: 2px solid #10b981;
  padding: 14px;
  border-radius: 12px;
  font-weight: bold;
  color: #065f46;
}

/* 📱 General mobile/tablet rules */
@media (max-width: 768px) {
  .container { width: 95%; padding: 12px; }
  h1 { font-size: 1.6rem; text-align: center; }
  .actions { flex-direction: column; }
  .button { width: 100%; }
}

/* 📱 Extra small screens (< 450px) */
@media (max-width: 450px) {
  .nav {
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
  }
  .nav a {
    display: block;
    width: 100%;
    text-align: center;
    padding: 10px;
    font-size: 0.9rem;
    border: 1px solid var(--ring);
    border-radius: 8px;
    background: #f9fafb;
  }
  .nav a.active {
    background: var(--brand);
    color: var(--brand-ink);
  }
}