* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --grad: linear-gradient(135deg, #7c3aed, #ec4899);
  --grad2: linear-gradient(135deg, #a855f7, #f472b6);
  --bg: #0f0a1a;
  --card: rgba(255,255,255,0.06);
  --text: #f0e6ff;
  --muted: #a78bbd;
}
body { font-family: 'Segoe UI', system-ui, sans-serif; background: var(--bg); color: var(--text); min-height: 100vh; }
a { color: inherit; text-decoration: none; }

/* Nav */
.nav { display: flex; align-items: center; justify-content: space-between; padding: 1rem 2rem; background: rgba(15,10,26,0.9); backdrop-filter: blur(10px); position: sticky; top: 0; z-index: 100; border-bottom: 1px solid rgba(255,255,255,0.05); }
.nav-brand { font-size: 1.4rem; font-weight: 800; background: var(--grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.nav-links { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.nav-links a { font-size: 0.9rem; opacity: 0.7; transition: 0.2s; }
.nav-links a:hover { opacity: 1; }
.lang-btn { cursor: pointer; background: var(--card); border: 1px solid rgba(255,255,255,0.1); color: var(--text); padding: 0.3rem 0.7rem; border-radius: 1rem; font-size: 0.8rem; }

/* Hero */
.hero { text-align: center; padding: 5rem 1rem 3rem; }
.hero h1 { font-size: 3.5rem; font-weight: 900; background: var(--grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; margin-bottom: 1rem; }
.hero p { font-size: 1.2rem; color: var(--muted); max-width: 600px; margin: 0 auto; }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; padding: 2rem; max-width: 1200px; margin: 0 auto; }
.card { background: var(--card); border: 1px solid rgba(255,255,255,0.08); border-radius: 1.2rem; padding: 2rem; transition: 0.3s; cursor: pointer; position: relative; overflow: hidden; }
.card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--grad); }
.card:hover { transform: translateY(-6px); border-color: rgba(168,85,247,0.3); box-shadow: 0 20px 40px rgba(124,58,237,0.15); }
.card-icon { font-size: 3rem; margin-bottom: 1rem; }
.card h3 { font-size: 1.3rem; margin-bottom: 0.5rem; }
.card p { color: var(--muted); font-size: 0.95rem; line-height: 1.5; }

/* Quiz container */
.quiz-wrap { max-width: 700px; margin: 0 auto; padding: 2rem 1rem; }
.quiz-header { text-align: center; margin-bottom: 2rem; }
.quiz-header h1 { font-size: 2.2rem; background: var(--grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.progress-bar { width: 100%; height: 6px; background: var(--card); border-radius: 3px; margin: 1.5rem 0; overflow: hidden; }
.progress-fill { height: 100%; background: var(--grad); border-radius: 3px; transition: width 0.4s; }
.progress-text { text-align: center; color: var(--muted); font-size: 0.85rem; margin-bottom: 1rem; }

.question-card { background: var(--card); border-radius: 1rem; padding: 2rem; border: 1px solid rgba(255,255,255,0.08); animation: fadeIn 0.3s; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
.question-card h2 { font-size: 1.2rem; margin-bottom: 1.5rem; line-height: 1.5; }
.options { display: flex; flex-direction: column; gap: 0.7rem; }
.option-btn { background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.1); color: var(--text); padding: 1rem 1.2rem; border-radius: 0.8rem; cursor: pointer; font-size: 1rem; text-align: left; transition: 0.2s; }
.option-btn:hover { background: rgba(168,85,247,0.15); border-color: rgba(168,85,247,0.4); }
.option-btn.selected { background: rgba(168,85,247,0.25); border-color: #a855f7; }

/* Result */
.result-card { text-align: center; background: var(--card); border-radius: 1.5rem; padding: 3rem 2rem; border: 1px solid rgba(255,255,255,0.1); }
.result-age { font-size: 5rem; font-weight: 900; background: var(--grad); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.result-label { font-size: 1.5rem; margin: 0.5rem 0 1rem; }
.result-desc { color: var(--muted); line-height: 1.7; max-width: 500px; margin: 0 auto 2rem; }
.share-btns { display: flex; gap: 0.8rem; justify-content: center; flex-wrap: wrap; margin-top: 1.5rem; }
.btn { padding: 0.8rem 1.8rem; border-radius: 2rem; border: none; font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: 0.2s; }
.btn-primary { background: var(--grad); color: white; }
.btn-primary:hover { opacity: 0.9; transform: scale(1.03); }
.btn-outline { background: transparent; border: 1px solid rgba(255,255,255,0.2); color: var(--text); }
.btn-outline:hover { border-color: #a855f7; }

/* Brain game specific */
.game-area { background: var(--card); border-radius: 1rem; padding: 2rem; text-align: center; border: 1px solid rgba(255,255,255,0.08); min-height: 300px; display: flex; flex-direction: column; align-items: center; justify-content: center; }
.game-area h2 { margin-bottom: 1rem; }
.reaction-circle { width: 150px; height: 150px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; font-weight: 700; cursor: pointer; transition: 0.15s; margin: 1rem auto; }
.memory-grid { display: grid; gap: 0.8rem; margin: 1rem auto; }
.mem-cell { width: 70px; height: 70px; border-radius: 0.8rem; cursor: pointer; transition: 0.2s; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; }
.mem-cell.hidden { background: rgba(168,85,247,0.3); }
.mem-cell.revealed { background: rgba(236,72,153,0.3); }
.mem-cell.matched { background: rgba(34,197,94,0.3); }

/* Footer */
.footer { text-align: center; padding: 3rem 1rem; color: var(--muted); font-size: 0.85rem; border-top: 1px solid rgba(255,255,255,0.05); margin-top: 3rem; }
.footer a { color: #a855f7; }
.tip-link { display: inline-block; margin-top: 0.5rem; padding: 0.4rem 1rem; background: var(--card); border-radius: 1rem; font-size: 0.8rem; border: 1px solid rgba(255,255,255,0.08); }

/* Health tips */
.tips-list { text-align: left; margin: 1.5rem auto; max-width: 450px; }
.tips-list li { margin: 0.6rem 0; color: var(--muted); line-height: 1.5; }
.tips-list li strong { color: var(--text); }

@media (max-width: 600px) {
  .hero h1 { font-size: 2.2rem; }
  .nav { padding: 0.8rem 1rem; }
  .nav-links { gap: 0.8rem; }
  .cards { padding: 1rem; }
}