:root {
  --primary: #1a6b4f;
  --primary-dark: #145238;
  --primary-light: #e6f4ee;
  --accent: #f5a623;
  --bg: #f4f6f8;
  --text: #23302a;
  --text-muted: #6b7a72;
  --card-bg: #ffffff;
  --border: #dfe7e2;
  --correct: #2e8b57;
  --wrong: #c0392b;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container { width: 100%; max-width: 860px; margin: 0 auto; padding: 0 20px; }

/* HEADER */
.site-header {
  background: var(--primary);
  color: #fff;
  padding: 14px 0;
  box-shadow: 0 2px 10px rgba(0,0,0,0.15);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; }
.logo { font-size: 32px; line-height: 1; }
.brand h1 { font-size: 22px; margin: 0; }
.tagline { font-size: 12px; opacity: 0.9; }
.main-nav { display: flex; gap: 6px; flex-wrap: wrap; }
.nav-btn {
  background: transparent; border: 1px solid rgba(255,255,255,0.35); color: #fff;
  padding: 7px 16px; border-radius: 20px; cursor: pointer; font-size: 14px; transition: all 0.2s;
}
.nav-btn:hover { background: rgba(255,255,255,0.15); }
.nav-btn.active { background: #fff; color: var(--primary); font-weight: 600; }

/* MAIN */
main { flex: 1; padding: 28px 0 40px; }
.view { display: none; }
.view.active { display: block; }
.view h2 { font-size: 26px; margin-bottom: 6px; color: var(--primary-dark); }
.lead { color: var(--text-muted); margin-bottom: 22px; max-width: 640px; }

/* CARDS CATEGORÍA (inicio) */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 16px; margin-bottom: 24px; }
.category-card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; cursor: pointer; transition: transform 0.15s, box-shadow 0.15s; text-align: left;
  box-shadow: var(--shadow);
}
.category-card:hover { transform: translateY(-3px); box-shadow: 0 6px 16px rgba(0,0,0,0.1); }
.category-card .cat-emoji { font-size: 34px; }
.category-card h3 { font-size: 17px; margin: 8px 0 4px; color: var(--primary-dark); }
.category-card p { font-size: 13px; color: var(--text-muted); }
.category-card .cat-meta { display: flex; justify-content: space-between; align-items: center; margin-top: 12px; }
.category-card .cat-count { font-size: 12px; background: var(--primary-light); color: var(--primary-dark); padding: 3px 10px; border-radius: 12px; font-weight: 600; }

/* QUIZ */
.quiz-header { display: flex; align-items: center; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }
.btn-back { background: var(--card-bg); border: 1px solid var(--border); padding: 7px 14px; border-radius: 20px; cursor: pointer; font-size: 14px; color: var(--text); }
.btn-back:hover { background: #eef2f0; }
#quizTitle { font-size: 22px; margin: 0; flex: 1; color: var(--primary-dark); }
.badge { background: var(--accent); color: #fff; padding: 4px 12px; border-radius: 16px; font-weight: 700; font-size: 14px; }

.question-card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 24px; margin-bottom: 16px; box-shadow: var(--shadow);
}
.q-stem { font-size: 17px; font-weight: 500; margin-bottom: 16px; }
.options { display: flex; flex-direction: column; gap: 10px; }
.option {
  display: block; width: 100%; text-align: left; background: #fafcfb; border: 2px solid var(--border);
  padding: 12px 16px; border-radius: 10px; cursor: pointer; font-size: 15px; transition: all 0.15s;
}
.option:hover { border-color: var(--primary); background: var(--primary-light); }
.option.selected { border-color: var(--primary); background: var(--primary-light); font-weight: 500; }
.option.correct { border-color: var(--correct); background: #eafaf1; }
.option.wrong { border-color: var(--wrong); background: #fdecea; }

.feedback { margin-top: 16px; padding: 12px 14px; border-radius: 10px; font-size: 14px; display: none; }
.feedback.show { display: block; }
.feedback.correct { background: #eafaf1; border-left: 4px solid var(--correct); }
.feedback.wrong { background: #fdecea; border-left: 4px solid var(--wrong); }
.feedback .fx { font-weight: 700; }

.quiz-footer { display: flex; gap: 12px; margin-top: 8px; }
.btn-primary { background: var(--primary); color: #fff; border: none; padding: 12px 28px; border-radius: 24px; font-size: 15px; font-weight: 600; cursor: pointer; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: var(--card-bg); border: 1px solid var(--border); padding: 12px 24px; border-radius: 24px; font-size: 15px; cursor: pointer; color: var(--text); }
.btn-ghost:hover { background: #eef2f0; }
.btn-disabled { opacity: 0.5; cursor: not-allowed; }

/* RESULTADO FINAL */
.final-card { text-align: center; padding: 40px 24px; }
.final-score { font-size: 44px; font-weight: 800; color: var(--primary); }
.final-msg { font-size: 16px; color: var(--text-muted); margin: 8px 0 20px; }

/* PROGRESO */
.stat-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.stat { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 20px; flex: 1; min-width: 140px; text-align: center; box-shadow: var(--shadow); }
.stat .num { font-size: 26px; font-weight: 800; color: var(--primary); }
.stat .lbl { font-size: 12px; color: var(--text-muted); }
.progress-bar-wrap { background: var(--border); border-radius: 12px; overflow: hidden; height: 14px; margin: 8px 0 4px; }
.progress-bar { height: 100%; background: var(--primary); border-radius: 12px; transition: width 0.4s; }
.cat-progress { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 20px; margin-bottom: 12px; box-shadow: var(--shadow); }
.cat-progress h4 { display: flex; justify-content: space-between; margin-bottom: 6px; font-size: 15px; }
.cat-progress h4 .pct { color: var(--primary); font-weight: 700; }

.tip-box { background: #fff8ec; border: 1px solid #f0dcae; border-radius: var(--radius); padding: 16px 20px; }
.tip-box h3 { color: #8a6d00; margin-bottom: 4px; font-size: 16px; }

.site-footer { background: #1f2b26; color: rgba(255,255,255,0.7); padding: 16px 0; text-align: center; font-size: 13px; }
.site-footer strong { color: #fff; }