@import "https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700;800&family=Plus+Jakarta+Sans:wght@400;500;600;700&display=swap";:root{--bg-primary:#0a0d14;--bg-secondary:#111726;--bg-tertiary:#192238;--card-bg:#172036bf;--card-border:#ffffff14;--card-glow:#6366f126;--text-primary:#f8fafc;--text-secondary:#94a3b8;--text-muted:#64748b;--accent-primary:#6366f1;--accent-primary-hover:#4f46e5;--accent-secondary:#06b6d4;--accent-success:#10b981;--accent-warning:#f59e0b;--accent-danger:#ef4444;--accent-purple:#a855f7;--gradient-brand:linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);--gradient-card:linear-gradient(145deg, #1e2943cc 0%, #111827cc 100%);--gradient-gold:linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%);--radius-sm:8px;--radius-md:14px;--radius-lg:20px;--radius-xl:28px;--shadow-sm:0 4px 6px -1px #0003;--shadow-md:0 10px 25px -5px #0000004d, 0 8px 10px -6px #0000004d;--shadow-lg:0 20px 40px -15px #00000080;--shadow-glow:0 0 35px -5px #6366f14d;--font-heading:"Outfit", sans-serif;--font-body:"Plus Jakarta Sans", sans-serif;--transition-fast:.15s ease;--transition-normal:.3s cubic-bezier(.16, 1, .3, 1);--transition-bounce:.5s cubic-bezier(.34, 1.56, .64, 1)}[data-theme=light]{--bg-primary:#f8fafc;--bg-secondary:#fff;--bg-tertiary:#f1f5f9;--card-bg:#ffffffd9;--card-border:#e2e8f0cc;--card-glow:#6366f114;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#94a3b8;--gradient-card:linear-gradient(145deg, #ffffffe6 0%, #f8fafce6 100%);--shadow-md:0 10px 25px -5px #64748b1f;--shadow-lg:0 20px 40px -15px #64748b2e}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-body);background-color:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;min-height:100vh;line-height:1.5;position:relative;overflow-x:hidden}body:before,body:after{content:"";filter:blur(120px);pointer-events:none;z-index:0;opacity:.35;border-radius:50%;position:fixed}body:before{background:radial-gradient(circle,#6366f1 0%,#0000 70%);width:500px;height:500px;top:-10%;left:20%}body:after{background:radial-gradient(circle,#a855f7 0%,#0000 70%);width:450px;height:450px;bottom:5%;right:15%}#app{z-index:1;flex-direction:column;max-width:1200px;min-height:100vh;margin:0 auto;padding:1.25rem 1.5rem 3rem;display:flex;position:relative}.navbar{background:var(--card-bg);border:1px solid var(--card-border);-webkit-backdrop-filter:blur(16px);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);justify-content:space-between;align-items:center;gap:1rem;margin-bottom:1.5rem;padding:.85rem 1.4rem;display:flex}.brand-section{cursor:pointer;align-items:center;gap:.75rem;display:flex}.brand-logo{background:var(--gradient-brand);width:42px;height:42px;box-shadow:var(--shadow-glow);border-radius:12px;justify-content:center;align-items:center;font-size:1.35rem;display:flex}.brand-title{font-family:var(--font-heading);letter-spacing:-.5px;background:var(--gradient-brand);-webkit-text-fill-color:transparent;-webkit-background-clip:text;font-size:1.45rem;font-weight:800;display:inline-block}.brand-badge{color:var(--accent-primary);text-transform:uppercase;letter-spacing:.5px;background:#6366f126;border:1px solid #6366f14d;border-radius:20px;padding:2px 7px;font-size:.7rem;font-weight:600}.selectors-group{flex-wrap:wrap;align-items:center;gap:.6rem;display:flex}.custom-select{background:var(--bg-secondary);border:1px solid var(--card-border);color:var(--text-primary);border-radius:var(--radius-md);font-family:var(--font-body);cursor:pointer;transition:var(--transition-fast);outline:none;padding:.45rem .9rem;font-size:.88rem;font-weight:600}.custom-select:hover,.custom-select:focus{border-color:var(--accent-primary);box-shadow:0 0 0 2px #6366f133}.nav-actions{align-items:center;gap:.75rem;display:flex}.stat-pill{background:var(--bg-secondary);border:1px solid var(--card-border);border-radius:30px;align-items:center;gap:.4rem;padding:.4rem .85rem;font-size:.85rem;font-weight:700;display:flex}.stat-pill.streak{color:#f97316;background:#f9731614;border-color:#f973164d}.stat-pill.xp{color:#eab308;background:#eab30814;border-color:#eab3084d}.icon-btn{background:var(--bg-secondary);border:1px solid var(--card-border);color:var(--text-secondary);border-radius:var(--radius-md);cursor:pointer;width:38px;height:38px;transition:var(--transition-fast);justify-content:center;align-items:center;font-size:1.05rem;display:flex}.icon-btn:hover{color:var(--text-primary);background:var(--bg-tertiary);border-color:var(--accent-primary)}.nav-tabs{background:var(--bg-secondary);border-radius:var(--radius-lg);border:1px solid var(--card-border);gap:.35rem;margin-bottom:1.5rem;padding:.35rem;display:flex;overflow-x:auto}.tab-btn{min-width:120px;color:var(--text-secondary);font-family:var(--font-heading);border-radius:var(--radius-md);cursor:pointer;transition:var(--transition-fast);white-space:nowrap;background:0 0;border:none;flex:1;justify-content:center;align-items:center;gap:.5rem;padding:.65rem 1rem;font-size:.92rem;font-weight:600;display:flex}.tab-btn:hover{color:var(--text-primary);background:#ffffff08}.tab-btn.active{background:var(--accent-primary);color:#fff;box-shadow:0 4px 14px #6366f166}.goal-banner{background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius-lg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);justify-content:space-between;align-items:center;gap:1.25rem;margin-bottom:1.75rem;padding:1rem 1.4rem;display:flex}.goal-info{flex-direction:column;gap:.2rem;display:flex}.goal-title{align-items:center;gap:.5rem;font-size:.95rem;font-weight:700;display:flex}.goal-subtitle{color:var(--text-muted);font-size:.8rem}.goal-progress-wrap{flex-direction:column;flex:1;gap:.4rem;max-width:340px;display:flex}.goal-bar-bg{background:var(--bg-tertiary);border-radius:10px;width:100%;height:8px;overflow:hidden}.goal-bar-fill{background:var(--gradient-brand);border-radius:10px;height:100%;transition:width .4s}.goal-numbers{color:var(--text-secondary);text-align:right;font-size:.78rem;font-weight:600}.flashcard-stage{flex-direction:column;align-items:center;gap:1.5rem;width:100%;max-width:620px;margin:0 auto;display:flex}.card-scene{perspective:1200px;cursor:pointer;width:100%;height:380px}.card-inner{width:100%;height:100%;transform-style:preserve-3d;border-radius:var(--radius-xl);box-shadow:var(--shadow-lg), var(--shadow-glow);transition:transform .6s cubic-bezier(.4,.2,.2,1);position:relative}.card-inner.is-flipped{transform:rotateY(180deg)}.card-face{backface-visibility:hidden;border-radius:var(--radius-xl);border:1px solid var(--card-border);background:var(--gradient-card);-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);flex-direction:column;justify-content:space-between;width:100%;height:100%;padding:2.2rem;display:flex;position:absolute;inset:0}.card-face.card-back{background:linear-gradient(145deg,#172033 0%,#0d1527 100%);border:1px solid #6366f159;transform:rotateY(180deg);box-shadow:0 20px 40px #00000080,0 0 25px #6366f133}[data-theme=light] .card-face.card-back{background:linear-gradient(145deg,#fff 0%,#f8fafc 100%);border:1px solid #6366f14d;box-shadow:0 15px 35px #6366f11f}.card-topbar{justify-content:space-between;align-items:center;display:flex}.category-tag{color:var(--accent-secondary);background:#06b6d41f;border:1px solid #06b6d440;border-radius:20px;padding:3px 10px;font-size:.78rem;font-weight:600}.box-indicator{color:#fbbf24;background:#fbbf241f;border:1px solid #fbbf2440;border-radius:20px;align-items:center;gap:.35rem;padding:3px 10px;font-size:.76rem;font-weight:700;display:flex}.card-center{text-align:center;flex-direction:column;align-items:center;gap:.75rem;display:flex}.word-term{font-family:var(--font-heading);letter-spacing:-.5px;color:var(--text-primary);font-size:2.75rem;font-weight:800;line-height:1.15}.word-phonetic-row{align-items:center;gap:.75rem;display:flex}.word-phonetic{color:var(--text-secondary);font-family:monospace;font-size:1.05rem;font-style:italic}.speak-btn{color:var(--accent-primary);cursor:pointer;width:36px;height:36px;transition:var(--transition-fast);background:#6366f126;border:1px solid #6366f14d;border-radius:50%;justify-content:center;align-items:center;display:flex}.speak-btn:hover{background:var(--accent-primary);color:#fff;transform:scale(1.08)}.word-type-pill{color:var(--text-muted);text-transform:uppercase;letter-spacing:1px;font-size:.75rem;font-weight:700}.card-bottombar{text-align:center;color:var(--text-muted);justify-content:center;align-items:center;gap:.4rem;font-size:.82rem;display:flex}.card-back-translation{font-family:var(--font-heading);color:#34d399;letter-spacing:-.5px;text-shadow:0 2px 12px #10b9814d;margin-bottom:.35rem;font-size:2.2rem;font-weight:800}[data-theme=light] .card-back-translation{color:#059669;text-shadow:none}.example-box{border:1px solid #94a3b840;border-left:4px solid var(--accent-primary);border-radius:var(--radius-md);text-align:left;background:#0f172abf;width:100%;margin:.8rem 0;padding:1.1rem 1.35rem;box-shadow:inset 0 2px 6px #0000004d}[data-theme=light] .example-box{border:1px solid #cbd5e1;border-left:4px solid var(--accent-primary);background:#f8fafc;box-shadow:0 4px 12px #0000000a}.example-target{letter-spacing:.2px;margin-bottom:.45rem;font-size:1.12rem;font-weight:700;line-height:1.5;color:#fff!important}[data-theme=light] .example-target{color:#0f172a!important}.example-native{align-items:center;gap:.4rem;font-size:.98rem;font-weight:600;line-height:1.4;display:flex;color:#38bdf8!important}[data-theme=light] .example-native{color:#0284c7!important}.mnemonic-box{color:#fef08a;border-radius:var(--radius-sm);background:#f59e0b2e;border:1px solid #f59e0b66;margin-top:.4rem;padding:.5rem .9rem;font-size:.85rem;font-weight:600;line-height:1.45;display:inline-block}[data-theme=light] .mnemonic-box{color:#92400e;background:#fef3c7;border:1px solid #fde68a}.leitner-controls{grid-template-columns:repeat(3,1fr);gap:.9rem;width:100%;display:grid}.leitner-btn{border-radius:var(--radius-lg);cursor:pointer;transition:var(--transition-normal);font-family:var(--font-heading);border:1px solid #0000;flex-direction:column;justify-content:center;align-items:center;gap:.35rem;padding:.85rem .5rem;font-weight:700;display:flex;position:relative;overflow:hidden}.leitner-btn .shortcut-key{background:#ffffff1f;border-radius:4px;padding:2px 6px;font-family:monospace;font-size:.65rem;position:absolute;top:6px;right:6px}.leitner-btn.btn-wrong{color:#f87171;background:#ef44441f;border-color:#ef44444d}.leitner-btn.btn-wrong:hover{background:#ef444440;border-color:#ef4444;transform:translateY(-2px)}.leitner-btn.btn-hard{color:#fbbf24;background:#f59e0b1f;border-color:#f59e0b4d}.leitner-btn.btn-hard:hover{background:#f59e0b40;border-color:#f59e0b;transform:translateY(-2px)}.leitner-btn.btn-know{color:#34d399;background:#10b9811f;border-color:#10b9814d}.leitner-btn.btn-know:hover{background:#10b98140;border-color:#10b981;transform:translateY(-2px)}.leitner-subtext{opacity:.8;font-size:.72rem;font-weight:500}.quiz-container{flex-direction:column;gap:1.5rem;width:100%;max-width:650px;margin:0 auto;display:flex}.quiz-card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius-xl);text-align:center;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);box-shadow:var(--shadow-md);padding:2.2rem;position:relative}.quiz-prompt-label{color:var(--accent-secondary);text-transform:uppercase;letter-spacing:1px;margin-bottom:.75rem;font-size:.82rem;font-weight:700}.quiz-term{font-family:var(--font-heading);margin-bottom:.75rem;font-size:2.5rem;font-weight:800}.quiz-options-grid{grid-template-columns:1fr 1fr;gap:1rem;margin-top:1.5rem;display:grid}.quiz-option-btn{background:var(--bg-secondary);border:1px solid var(--card-border);color:var(--text-primary);border-radius:var(--radius-lg);font-family:var(--font-heading);cursor:pointer;transition:var(--transition-fast);text-align:left;align-items:center;gap:.75rem;padding:1.1rem 1rem;font-size:1.05rem;font-weight:600;display:flex}.quiz-option-btn:hover:not(:disabled){border-color:var(--accent-primary);background:var(--bg-tertiary);transform:translateY(-2px)}.option-badge{width:26px;height:26px;color:var(--text-secondary);background:#ffffff14;border-radius:8px;justify-content:center;align-items:center;font-size:.8rem;display:flex}.quiz-option-btn.correct{border-color:var(--accent-success)!important;color:#34d399!important;background:#10b98133!important}.quiz-option-btn.wrong{border-color:var(--accent-danger)!important;color:#f87171!important;background:#ef444433!important}.spelling-container{width:100%;max-width:580px;margin:0 auto}.spelling-card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius-xl);text-align:center;box-shadow:var(--shadow-md);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);flex-direction:column;align-items:center;gap:1.25rem;padding:2.5rem;display:flex}.big-listen-btn{background:var(--gradient-brand);color:#fff;cursor:pointer;width:80px;height:80px;transition:var(--transition-bounce);border:none;border-radius:50%;justify-content:center;align-items:center;font-size:2rem;display:flex;box-shadow:0 10px 25px #6366f166}.big-listen-btn:hover{transform:scale(1.08)}.spelling-input{background:var(--bg-secondary);border:2px solid var(--card-border);border-radius:var(--radius-md);width:100%;max-width:380px;font-family:var(--font-heading);color:var(--text-primary);text-align:center;transition:var(--transition-fast);letter-spacing:1px;outline:none;padding:.9rem 1.2rem;font-size:1.3rem;font-weight:700}.spelling-input:focus{border-color:var(--accent-primary);box-shadow:0 0 0 3px #6366f140}.match-grid{grid-template-columns:repeat(3,1fr);gap:1rem;width:100%;max-width:720px;margin:0 auto;display:grid}.match-tile{background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius-lg);text-align:center;min-height:100px;font-family:var(--font-heading);cursor:pointer;transition:var(--transition-fast);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);-webkit-user-select:none;user-select:none;justify-content:center;align-items:center;padding:1.5rem 1rem;font-size:1.05rem;font-weight:700;display:flex}.match-tile:hover{border-color:var(--accent-primary);transform:translateY(-2px)}.match-tile.selected{border-color:var(--accent-primary);background:#6366f133;box-shadow:0 0 15px #6366f166}.match-tile.matched{visibility:hidden;opacity:0;pointer-events:none;transition:all .3s;transform:scale(.9)}.stats-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1.25rem;margin-bottom:2rem;display:grid}.stat-card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius-lg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);align-items:center;gap:1rem;padding:1.5rem;display:flex}.stat-icon{background:var(--bg-tertiary);border-radius:14px;justify-content:center;align-items:center;width:48px;height:48px;font-size:1.5rem;display:flex}.stat-num{font-family:var(--font-heading);font-size:1.75rem;font-weight:800;line-height:1.1}.stat-label{color:var(--text-muted);font-size:.8rem}.leitner-boxes-section{background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius-xl);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);margin-bottom:2rem;padding:2rem}.boxes-header{margin-bottom:1.5rem}.boxes-container{grid-template-columns:repeat(5,1fr);gap:1rem;display:grid}.leitner-box-column{background:var(--bg-secondary);border:1px solid var(--card-border);border-radius:var(--radius-lg);text-align:center;transition:var(--transition-normal);flex-direction:column;gap:.6rem;padding:1.2rem .8rem;display:flex;position:relative}.leitner-box-column:hover{border-color:var(--accent-primary);transform:translateY(-4px)}.box-title{font-family:var(--font-heading);color:var(--text-secondary);font-size:.9rem;font-weight:700}.box-count{font-family:var(--font-heading);color:var(--accent-primary);font-size:2rem;font-weight:800}.box-interval{color:var(--text-muted);font-size:.72rem}.modal-overlay{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:100;background:#000000bf;justify-content:center;align-items:center;padding:1rem;animation:.2s fadeIn;display:flex;position:fixed;inset:0}.modal-dialog{background:var(--bg-secondary);border:1px solid var(--card-border);border-radius:var(--radius-xl);width:100%;max-width:520px;box-shadow:var(--shadow-lg);padding:2rem;animation:.3s cubic-bezier(.16,1,.3,1) slideUp}.modal-header{justify-content:space-between;align-items:center;margin-bottom:1.5rem;display:flex}.form-group{flex-direction:column;gap:.4rem;margin-bottom:1rem;display:flex}.form-label{color:var(--text-secondary);font-size:.82rem;font-weight:600}.form-input{background:var(--bg-tertiary);border:1px solid var(--card-border);border-radius:var(--radius-md);color:var(--text-primary);font-family:var(--font-body);transition:var(--transition-fast);outline:none;padding:.75rem 1rem;font-size:.95rem}.form-input:focus{border-color:var(--accent-primary);box-shadow:0 0 0 2px #6366f133}.btn-primary{background:var(--gradient-brand);color:#fff;border-radius:var(--radius-md);font-family:var(--font-heading);cursor:pointer;transition:var(--transition-fast);border:none;padding:.85rem 1.4rem;font-size:1rem;font-weight:700;box-shadow:0 4px 14px #6366f166}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 20px #6366f180}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@media (width<=768px){#app{padding:.75rem .75rem 2rem}.navbar{flex-direction:column;align-items:stretch;gap:.75rem}.selectors-group{justify-content:space-between}.card-scene{height:420px}.word-term{font-size:2.2rem}.boxes-container{grid-template-columns:repeat(2,1fr)}.quiz-options-grid{grid-template-columns:1fr}.match-grid{grid-template-columns:repeat(2,1fr)}}