:root{--bg-primary:#f8fafc;--bg-secondary:#fff;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#94a3b8;--border-color:#e2e8f0;--accent-color:#4f46e5;--accent-hover:#4338ca;--accent-light:#e0e7ff;--success-color:#10b981;--success-light:#d1fae5;--danger-color:#ef4444;--danger-light:#fee2e2;--radius-sm:6px;--radius-md:12px;--radius-lg:18px;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #00000012, 0 2px 4px -2px #00000012;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -4px #0000001a;--shadow-card:0 20px 25px -5px #0000000d, 0 10px 10px -5px #0000000a;--font-sans:"Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;--font-mono:"Fira Code", "Courier New", Courier, monospace}:root.dark{--bg-primary:#0b0f19;--bg-secondary:#131a26;--text-primary:#f8fafc;--text-secondary:#94a3b8;--text-muted:#64748b;--border-color:#1e293b;--accent-color:#6366f1;--accent-hover:#4f46e5;--accent-light:#1e1b4b;--success-color:#34d399;--success-light:#064e3b;--danger-color:#f87171;--danger-light:#7f1d1d;--shadow-sm:0 1px 2px 0 #00000080;--shadow-md:0 4px 6px -1px #0000004d, 0 2px 4px -2px #0000004d;--shadow-lg:0 10px 15px -3px #0006, 0 4px 6px -4px #0006;--shadow-card:0 20px 25px -5px #0000004d, 0 10px 10px -5px #0003}*{box-sizing:border-box;margin:0;padding:0;transition:background-color .3s,border-color .3s}body{font-family:var(--font-sans);background-color:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.5}#root{flex-direction:column;min-height:100vh;display:flex}.app-container{flex-direction:column;flex:1;width:100%;max-width:1200px;margin:0 auto;padding:2rem 1.5rem;display:flex}h1{letter-spacing:-.04em;color:var(--text-primary);font-size:2.75rem;font-weight:800;line-height:1.2}h2{letter-spacing:-.02em;color:var(--text-primary);font-size:1.5rem;font-weight:600}p{color:var(--text-secondary)}button{cursor:pointer;font-family:var(--font-sans);background:0 0;border:none;align-items:center;gap:.5rem;font-size:.95rem;font-weight:500;transition:all .2s cubic-bezier(.4,0,.2,1);display:inline-flex}.btn-primary{background-color:var(--accent-color);color:#fff;border-radius:var(--radius-md);box-shadow:var(--shadow-sm);padding:.625rem 1.25rem}.btn-primary:hover{background-color:var(--accent-hover);box-shadow:var(--shadow-md);transform:translateY(-1px)}.btn-primary:active{transform:translateY(0)}.btn-secondary{background-color:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);padding:.625rem 1.25rem}.btn-secondary:hover{background-color:var(--bg-primary);border-color:var(--text-muted)}.btn-icon{width:2.25rem;height:2.25rem;color:var(--text-secondary);border:1px solid var(--border-color);background-color:var(--bg-secondary);border-radius:50%;justify-content:center;align-items:center;display:flex}.btn-icon:hover{color:var(--text-primary);border-color:var(--text-muted);background-color:var(--bg-primary)}.toast{background-color:var(--bg-secondary);border:1px solid var(--border-color);color:var(--text-primary);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);z-index:1000;align-items:center;gap:.75rem;padding:1rem 1.5rem;animation:.3s cubic-bezier(.16,1,.3,1) forwards slideUp;display:flex;position:fixed;bottom:2rem;right:2rem}@keyframes slideUp{0%{opacity:0;transform:translateY(1rem)}to{opacity:1;transform:translateY(0)}}.app-header{text-align:center;flex-direction:column;align-items:center;gap:1rem;margin-bottom:2.5rem;display:flex}.logo-section{justify-content:center;align-items:center;gap:.75rem;display:flex}.logo-text{font-family:var(--font-sans);letter-spacing:-.05em;cursor:pointer;font-size:3.5rem;font-weight:900;line-height:1.2;display:inline-block;position:relative}.wrod-logo{opacity:1;background:linear-gradient(135deg, var(--accent-color) 0%, #ec4899 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;transition:all .75s cubic-bezier(.16,1,.3,1);display:inline-block;transform:scale(1)translateY(0)}.word-logo{opacity:0;-webkit-text-fill-color:transparent;white-space:nowrap;background:linear-gradient(135deg,#10b981 0%,#3b82f6 100%);-webkit-background-clip:text;background-clip:text;justify-content:center;align-items:center;width:100%;height:100%;transition:all .75s cubic-bezier(.16,1,.3,1);display:inline-flex;position:absolute;top:0;left:0;transform:scale(.85)translateY(10px)}.logo-text:hover .wrod-logo{opacity:0;transform:scale(.85)translateY(-10px)}.logo-text:hover .word-logo{opacity:1;transform:scale(1)translateY(0)}.tagline{color:var(--text-secondary);max-width:600px;margin:0 auto;font-size:1.15rem}.header-actions{flex-wrap:wrap;justify-content:center;align-items:center;gap:1rem;margin-top:.5rem;display:flex}.controls-bar{flex-direction:column;gap:1.25rem;margin-bottom:2rem;display:flex}.search-filter-row{flex-wrap:wrap;align-items:center;gap:1rem;width:100%;display:flex}.mode-toggle-group{background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);align-items:center;padding:.25rem;display:flex}.mode-btn{border-radius:calc(var(--radius-md) - 2px);color:var(--text-secondary);padding:.5rem 1rem;font-size:.875rem;font-weight:600}.mode-btn.active{background-color:var(--accent-color);color:#fff}.view-mode-bar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:1rem;display:flex}.cards-grid{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:1.5rem;margin-bottom:3rem;display:grid}.card-container{perspective:1200px;width:100%;height:180px}.wrod-card{width:100%;height:100%;transform-style:preserve-3d;cursor:pointer;transition:transform .8s cubic-bezier(.34,1.56,.64,1);position:relative}.card-container.flipped .wrod-card{transform:rotateY(180deg)}.card-face{backface-visibility:hidden;border-radius:var(--radius-lg);border:1px solid var(--border-color);width:100%;height:100%;box-shadow:var(--shadow-card);transform-style:preserve-3d;flex-direction:column;padding:1.5rem;display:flex;position:absolute;top:0;left:0;overflow:hidden}.card-face:after{content:"";pointer-events:none;z-index:10;background:linear-gradient(90deg,#fff0 0%,#ffffff14 35%,#ffffff38 50%,#ffffff14 65%,#fff0 100%);width:100%;height:100%;transition:none;position:absolute;top:0;left:-150%;transform:skew(-20deg)}.card-container:hover .card-face:after{transition:left .75s;left:150%}.card-face.front{background-color:var(--bg-secondary);z-index:2;justify-content:space-between}.word-display-wrapper{text-align:center;transform-style:preserve-3d;flex-direction:column;flex:1;justify-content:center;align-items:center;padding:1rem 0;display:flex;transform:translateZ(40px)}.word-main{letter-spacing:-.03em;color:var(--text-primary);margin-bottom:.25rem;font-size:2.25rem;font-weight:800;display:inline-block;transform:translateZ(50px)}.word-phonetic{color:var(--text-muted);font-size:.875rem;font-family:var(--font-mono);display:inline-block;transform:translateZ(30px)}.card-bottom-row{justify-content:center;align-items:center;width:100%;display:flex;transform:translateZ(20px)}.reveal-hint{color:var(--text-muted);align-items:center;gap:.25rem;font-size:.75rem;font-weight:500;transition:color .2s;display:flex}.card-container:hover .reveal-hint{color:var(--accent-color)}.card-container:hover .card-face.front{border-color:var(--accent-color);transform:translateY(-4px);box-shadow:0 20px 30px -10px #6366f140}.card-face.back{background-color:var(--bg-secondary);border-left:4px solid var(--accent-color);justify-content:space-between;transform:rotateY(180deg)}.card-header-back{border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;width:100%;padding-bottom:.5rem;display:flex;transform:translateZ(25px)}.back-title{text-transform:uppercase;color:var(--accent-color);letter-spacing:.05em;font-size:.75rem;font-weight:700}.back-word-comparison{align-items:center;display:flex;transform:translateZ(45px)}.back-word-bad{color:var(--danger-color);font-size:1.15rem;font-weight:700;text-decoration:line-through}.back-word-arrow{color:var(--text-muted)}.back-word-good{color:var(--success-color);font-size:1.35rem;font-weight:800}.card-bottom-row-back{justify-content:space-between;align-items:center;width:100%;display:flex;transform:translateZ(20px)}.audio-btn{background-color:var(--bg-primary);width:2rem;height:2rem;color:var(--text-secondary);border:1px solid var(--border-color);border-radius:50%;justify-content:center;align-items:center;transition:all .2s cubic-bezier(.4,0,.2,1);display:flex}.audio-btn:hover{background-color:var(--accent-light);color:var(--accent-color);border-color:var(--accent-color);transform:scale(1.1)}.empty-state{text-align:center;background-color:var(--bg-secondary);border:1px dashed var(--border-color);border-radius:var(--radius-lg);margin:2rem 0;padding:4rem 2rem}.empty-text{color:var(--text-secondary);margin-bottom:.5rem;font-size:1.15rem;font-weight:600}.empty-sub{color:var(--text-muted);font-size:.9rem}@media (width<=768px){.search-filter-row{flex-direction:column;align-items:stretch}.mode-toggle-group{justify-content:center}}