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:root{--bg-app:#090d16;--bg-surface:#111827d9;--bg-surface-hover:#1f2937e6;--border-glass:#ffffff14;--border-glass-glow:#6366f14d;--primary:#6366f1;--primary-glow:#6366f126;--primary-gradient:linear-gradient(135deg, #6366f1 0%, #a855f7 100%);--text-main:#f3f4f6;--text-muted:#9ca3af;--text-inverse:#fff;--color-critical:#f43f5e;--color-weak:#fb7185;--color-learning:#f59e0b;--color-stable:#3b82f6;--color-mastered:#10b981;--color-new:#a855f7;--shadow-glow:0 8px 32px 0 #0000005e;--shadow-primary:0 0 20px 2px #6366f140;--font-family:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--radius-lg:16px;--radius-md:12px;--radius-sm:8px}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;margin:0;padding:0}html,body{background-color:var(--bg-app);width:100%;height:100%;min-height:100%;color:var(--text-main);font-family:var(--font-family);overscroll-behavior-y:none;line-height:1.5;overflow-x:hidden}body{flex-direction:column;min-height:100dvh;display:flex}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:var(--bg-app)}::-webkit-scrollbar-thumb{background:var(--border-glass);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--primary)}.glass-panel{background:var(--bg-surface);-webkit-backdrop-filter:blur(12px);border:1px solid var(--border-glass);border-radius:var(--radius-lg);box-shadow:var(--shadow-glow);transition:border .3s,transform .2s,box-shadow .3s}.glass-panel:hover{border:1px solid #ffffff1f}.glass-panel.interactive:active{transform:scale(.98)}.glow-accent{position:relative;overflow:hidden}.glow-accent:before{content:"";background:var(--primary-gradient);height:4px;position:absolute;top:0;left:0;right:0}h1,h2,h3,h4{letter-spacing:-.025em;color:#fff;font-weight:700}p{color:var(--text-muted)}.container{width:100%;max-width:600px;padding:16px;padding-top:max(16px, env(safe-area-inset-top));margin:0 auto;padding-bottom:96px}.bottom-nav{height:calc(60px + env(safe-area-inset-bottom));-webkit-backdrop-filter:blur(16px);border-top:1px solid var(--border-glass);z-index:1000;padding:0 12px env(safe-area-inset-bottom);background:#090d16d9;justify-content:space-around;align-items:center;display:flex;position:fixed;bottom:0;left:0;right:0}.bottom-nav-item{color:var(--text-muted);border-radius:var(--radius-md);cursor:pointer;flex-direction:column;justify-content:center;align-items:center;width:72px;height:48px;font-size:11px;text-decoration:none;transition:color .2s,background-color .2s;display:flex}.bottom-nav-item.active{color:var(--primary);background:var(--primary-glow)}.bottom-nav-icon{margin-bottom:2px;font-size:16px}.btn{border-radius:var(--radius-md);cursor:pointer;border:none;justify-content:center;align-items:center;width:100%;padding:12px 24px;font-size:14px;font-weight:600;transition:all .2s;display:inline-flex}.btn-primary{background:var(--primary-gradient);color:#fff;box-shadow:0 4px 14px #6366f14d}.btn-primary:hover{transform:translateY(-1px);box-shadow:0 6px 20px #6366f166}.btn-primary:active{transform:translateY(1px)}.btn-secondary{color:var(--text-main);border:1px solid var(--border-glass);background:#ffffff1a}.btn-secondary:hover{background:#ffffff1a}.status-badge{text-transform:uppercase;border-radius:20px;align-items:center;padding:2px 8px;font-size:11px;font-weight:600;display:inline-flex}.status-new{color:var(--color-new);background:#a855f726}.status-critical{color:var(--color-critical);background:#f43f5e26}.status-weak{color:var(--color-weak);background:#fb718526}.status-learning{color:var(--color-learning);background:#f59e0b26}.status-stable{color:var(--color-stable);background:#3b82f626}.status-mastered{color:var(--color-mastered);background:#10b98126}.score-tag{border-radius:4px;padding:2px 6px;font-size:12px;font-weight:700}.score-tag.high{color:var(--color-mastered)}.score-tag.medium{color:var(--color-stable)}.score-tag.low{color:var(--color-learning)}.score-tag.critical{color:var(--color-critical)}.progress-bar-container{background:#ffffff0d;border-radius:3px;width:100%;height:6px;overflow:hidden}.progress-bar-fill{background:var(--primary-gradient);height:100%;transition:width .3s}.flashcard-wrapper{perspective:1000px;cursor:pointer;width:100%;height:320px;margin:16px 0}.flashcard-inner{text-align:center;width:100%;height:100%;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,0,.2,1);position:relative}.flashcard-wrapper.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{backface-visibility:hidden;border-radius:var(--radius-lg);background:var(--bg-surface);border:1px solid var(--border-glass);width:100%;height:100%;box-shadow:var(--shadow-glow);flex-direction:column;justify-content:center;align-items:center;padding:24px;display:flex;position:absolute}.flashcard-back{border:1px solid var(--border-glass-glow);background:#111827f2;transform:rotateY(180deg)}.choice-btn{border:1px solid var(--border-glass);border-radius:var(--radius-md);width:100%;color:var(--text-main);text-align:left;cursor:pointer;background:#ffffff08;align-items:center;gap:12px;padding:12px;font-size:14px;transition:all .2s;display:flex}.choice-btn:hover{background:#ffffff14;border-color:#fff3}.choice-btn.selected{border-color:var(--primary);background:#6366f11a;box-shadow:0 0 12px #6366f126}.choice-btn.correct{border-color:var(--color-mastered);color:#fff;background:#10b98126}.choice-btn.wrong{border-color:var(--color-critical);color:#fff;background:#ef444426}.choice-badge{border:1px solid var(--border-glass);background:#ffffff0f;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;font-size:13px;font-weight:700;display:inline-flex}.choice-btn.selected .choice-badge{background:var(--primary);border-color:var(--primary);color:#fff}.choice-btn.correct .choice-badge{background:var(--color-mastered);border-color:var(--color-mastered);color:#fff}.choice-btn.wrong .choice-badge{background:var(--color-critical);border-color:var(--color-critical);color:#fff}@keyframes fadeInUp{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:.4s cubic-bezier(.16,1,.3,1) forwards fadeInUp}.sync-indicator{color:var(--text-muted);align-items:center;gap:6px;font-size:12px;display:inline-flex}.sync-dot{background:var(--color-mastered);width:8px;height:8px;box-shadow:0 0 8px var(--color-mastered);border-radius:50%}.sync-dot.offline{background:var(--color-learning);box-shadow:0 0 8px var(--color-learning)}@supports (padding:env(safe-area-inset-bottom)){.container{padding-bottom:calc(96px + env(safe-area-inset-bottom))}}@media (display-mode:standalone){body{background-color:var(--bg-app)}.bottom-nav{box-shadow:0 -12px 32px #00000047}}