@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";:root{--primary:#4f46e5;--primary-light:#e0e7ff;--primary-hover:#4338ca;--secondary:#7c3aed;--bg:#f1f5f9;--bg-white:#fff;--text:#0f172a;--text-secondary:#64748b;--text-muted:#94a3b8;--border:#e2e8f0;--success:#059669;--success-bg:#ecfdf5;--error:#dc2626;--error-bg:#fef2f2;--gold:#d97706;--gold-bg:#fffbeb;--cyan:#0891b2;--cyan-bg:#ecfeff;--shadow-sm:0 1px 3px #0000000f;--shadow-md:0 4px 16px #0000000f;--shadow-lg:0 8px 30px #00000014;--radius:16px;--radius-sm:12px;--transition:all .25s ease}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;min-height:100vh;font-family:Inter,system-ui,sans-serif;line-height:1.6}.app-container{max-width:480px;min-height:100vh;margin:0 auto;padding:20px 16px 90px}.card{background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow-sm);transition:var(--transition);margin-bottom:16px;padding:24px}.card:hover{box-shadow:var(--shadow-md)}.btn{border-radius:var(--radius-sm);cursor:pointer;transition:var(--transition);border:none;justify-content:center;align-items:center;gap:8px;padding:14px 24px;font-family:inherit;font-size:.95rem;font-weight:600;display:inline-flex}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 2px 8px #4f46e54d}.btn-primary:hover{background:var(--primary-hover);transform:translateY(-1px)}.btn-primary:active{transform:scale(.97)}.btn-secondary{background:var(--bg);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{background:var(--border)}h1{color:var(--text);font-size:1.6rem;font-weight:800}h2{color:var(--text);margin-bottom:8px;font-size:1.15rem;font-weight:700}p{color:var(--text-secondary);font-size:.9rem}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.animate-fade{animation:.4s forwards fadeIn}.streak-badge{background:var(--gold-bg);color:var(--gold);border:1px solid #fde68a;border-radius:30px;align-items:center;gap:5px;padding:6px 14px;font-size:.8rem;font-weight:700;display:inline-flex}.timer-display{font-variant-numeric:tabular-nums;text-align:center;color:var(--text);letter-spacing:-1px;margin:12px 0;font-size:3rem;font-weight:800}.option-btn{text-align:left;border-radius:var(--radius-sm);border:1.5px solid var(--border);background:var(--bg-white);width:100%;color:var(--text);cursor:pointer;transition:var(--transition);align-items:center;gap:12px;margin-bottom:10px;padding:14px 16px;font-size:.9rem;line-height:1.5;display:flex}.option-btn:hover,.option-btn.selected{border-color:var(--primary);background:var(--primary-light)}.option-btn.correct{border-color:var(--success);background:var(--success-bg)}.option-btn.wrong{border-color:var(--error);background:var(--error-bg)}.option-letter{border:2px solid var(--border);width:28px;height:28px;transition:var(--transition);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:.8rem;font-weight:700;display:flex}.option-btn.selected .option-letter{background:var(--primary);color:#fff;border-color:var(--primary)}.bottom-nav{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-top:1px solid var(--border);z-index:100;background:#ffffffeb;justify-content:space-around;align-items:center;width:100%;max-width:480px;height:68px;display:flex;position:fixed;bottom:0;left:50%;transform:translate(-50%)}.nav-item{color:var(--text-muted);cursor:pointer;transition:var(--transition);background:0 0;border:none;flex-direction:column;align-items:center;gap:3px;padding:4px 8px;font-size:.65rem;font-weight:600;display:flex}.nav-item.active,.nav-item:hover{color:var(--primary)}.progress-bar{background:var(--border);border-radius:3px;height:6px;overflow:hidden}.progress-bar-fill{border-radius:3px;height:100%;transition:width .5s}.subject-tag{text-transform:uppercase;letter-spacing:1px;color:var(--primary);background:var(--primary-light);border-radius:6px;padding:4px 10px;font-size:.7rem;font-weight:700;display:inline-block}.stat-card{background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius-sm);text-align:center;padding:16px}.stat-value{color:var(--text);font-size:1.5rem;font-weight:800}.stat-label{color:var(--text-muted);margin-top:2px;font-size:.75rem}.exam-header{background:var(--bg-white);border-bottom:1px solid var(--border);border-radius:var(--radius) var(--radius) 0 0;z-index:10;justify-content:space-between;align-items:center;margin:-20px -16px 20px;padding:12px 16px;display:flex;position:sticky;top:0}.countdown-chip{background:var(--cyan-bg);color:var(--cyan);border:1px solid #a5f3fc;border-radius:30px;padding:6px 14px;font-size:.8rem;font-weight:700}.review-card{background:var(--bg-white);border:1px solid var(--border);border-radius:var(--radius-sm);transition:var(--transition);margin-bottom:12px;overflow:hidden}.review-card:hover{box-shadow:var(--shadow-sm)}.hap-bilgi{border-radius:var(--radius-sm);background:var(--cyan-bg);border:1px solid #a5f3fc;margin-top:16px;padding:16px}.hap-bilgi-title{color:var(--cyan);letter-spacing:.5px;align-items:center;gap:4px;margin-bottom:6px;font-size:.72rem;font-weight:800;display:flex}.explanation-box{border-radius:var(--radius-sm);background:var(--primary-light);border:1px solid #c7d2fe;margin-top:12px;padding:16px}.flashcard-container{perspective:1000px;cursor:pointer;width:100%;height:480px;margin-bottom:20px}.flashcard{width:100%;height:100%;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,.2,.2,1);position:relative}.flashcard.flipped{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{backface-visibility:hidden;flex-direction:column;width:100%;height:100%;display:flex;position:absolute;top:0;left:0}.flashcard-back{transform:rotateY(180deg)}