@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap";:root{--bg: #f5f5f7;--bg2: #ffffff;--bg3: #f0f0f2;--surface: #ffffff;--surface-hov: #f7f7f9;--border: #e4e4e8;--border2: #d0d0d6;--ink: #111111;--ink2: #444444;--ink3: #888888;--ink4: #b0b0b8;--accent: #111111;--accent-hov: #333333;--ok: #16a34a;--ok-bg: #f0fdf4;--err: #dc2626;--err-bg: #fef2f2;--warn: #d97706;--warn-bg: #fffbeb;--r: 14px;--r2: 9px;--r3: 20px;--sh: 0 2px 12px rgba(0, 0, 0, .07), 0 1px 3px rgba(0, 0, 0, .05);--sh-md: 0 6px 24px rgba(0, 0, 0, .1), 0 2px 6px rgba(0, 0, 0, .06);--sh-lg: 0 16px 48px rgba(0, 0, 0, .13);--trans: all .18s cubic-bezier(.4, 0, .2, 1)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg);color:var(--ink);min-height:100vh;overflow-x:hidden;-webkit-font-smoothing:antialiased}.app-layout{display:flex;min-height:100vh}.sidebar{width:240px;min-height:100vh;position:fixed;top:0;left:0;bottom:0;z-index:100;background:var(--bg2);border-right:1px solid var(--border);display:flex;flex-direction:column;padding-bottom:20px}.sidebar-logo{padding:26px 20px 20px;border-bottom:1px solid var(--border);margin-bottom:12px}.sidebar-logo h1{font-size:1.25rem;font-weight:900;letter-spacing:-.6px;color:var(--ink)}.sidebar-logo span{font-size:.71rem;color:var(--ink3);font-weight:500}.sidebar-nav{display:flex;flex-direction:column;gap:2px;padding:0 12px;flex:1}.nav-item{display:flex;align-items:center;gap:11px;padding:10px 13px;border-radius:var(--r2);color:var(--ink2);text-decoration:none;font-size:.875rem;font-weight:600;transition:var(--trans);border:1px solid transparent;position:relative}.nav-item:hover{background:var(--bg3);color:var(--ink);border-color:var(--border)}.nav-item.active{background:var(--ink);color:#fff;border-color:var(--ink)}.nav-item.active:hover{background:var(--accent-hov)}.nav-icon{font-size:1rem;width:20px;text-align:center;flex-shrink:0}.sidebar-stat{margin:0 12px;padding:13px 16px;background:var(--bg3);border:1px solid var(--border);border-radius:var(--r);font-size:.78rem;color:var(--ink2);text-align:center}.sidebar-stat strong{display:block;font-size:1.5rem;font-weight:900;color:var(--ink);letter-spacing:-1px}.main-content{margin-left:240px;flex:1;padding:36px 40px;max-width:calc(100vw - 240px);min-height:100vh}.page-header{margin-bottom:28px}.page-header h1{font-size:1.75rem;font-weight:900;letter-spacing:-.8px;color:var(--ink);margin-bottom:3px}.page-header p{color:var(--ink3);font-size:.88rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);padding:22px;box-shadow:var(--sh);transition:var(--trans)}.card:hover{border-color:var(--border2);box-shadow:var(--sh-md)}.glow-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r3);padding:48px 40px;text-align:center;box-shadow:var(--sh-md)}.word-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px}.word-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);padding:18px 20px;box-shadow:var(--sh);transition:var(--trans);position:relative;overflow:hidden}.word-card:after{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:var(--ink);transform:scaleX(0);transform-origin:left;transition:transform .25s ease}.word-card:hover:after{transform:scaleX(1)}.word-card:hover{border-color:var(--border2);box-shadow:var(--sh-md);transform:translateY(-2px)}.word-card-term{font-size:1.05rem;font-weight:800;color:var(--ink);margin-bottom:7px;letter-spacing:-.3px}.word-card-def{font-size:.85rem;color:var(--ink2);line-height:1.55;margin-bottom:10px}.word-card-example{font-size:.79rem;color:var(--ink3);font-style:italic;padding:7px 11px;background:var(--bg3);border-left:2px solid var(--border2);border-radius:0 5px 5px 0;line-height:1.5}.word-card-actions{display:flex;gap:8px;margin-top:13px;justify-content:flex-end}.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:9px 18px;border-radius:var(--r2);font-family:inherit;font-size:.86rem;font-weight:700;cursor:pointer;border:none;outline:none;text-decoration:none;transition:var(--trans);white-space:nowrap}.btn-primary{background:var(--ink);color:#fff;box-shadow:0 2px 8px #0000002e}.btn-primary:hover{background:var(--accent-hov);transform:translateY(-1px);box-shadow:0 4px 14px #00000040}.btn-primary:active{transform:translateY(0);box-shadow:var(--sh)}.btn-secondary{background:var(--bg3);color:var(--ink2);border:1px solid var(--border2)}.btn-secondary:hover{background:var(--border);color:var(--ink);border-color:var(--ink4)}.btn-danger{background:var(--err-bg);color:var(--err);border:1px solid rgba(220,38,38,.2)}.btn-danger:hover{background:#fee2e2}.btn-sm{padding:6px 13px;font-size:.79rem}.btn-icon{padding:7px;border-radius:var(--r2)}.btn:disabled{opacity:.45;cursor:not-allowed;transform:none!important}.btn-hero{padding:14px 40px;font-size:1rem;border-radius:50px}.input-group{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}.input-group label{font-size:.75rem;font-weight:700;color:var(--ink3);text-transform:uppercase;letter-spacing:.7px}.input{background:var(--bg2);border:1px solid var(--border2);border-radius:var(--r2);padding:10px 14px;color:var(--ink);font-family:inherit;font-size:.89rem;transition:var(--trans);outline:none;width:100%}.input:focus{border-color:var(--ink);box-shadow:0 0 0 3px #1111111a}.input::placeholder{color:var(--ink4)}textarea.input{resize:vertical;min-height:80px}select.input{cursor:pointer;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23888' stroke-width='2.5'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 13px center;padding-right:36px}.badge{display:inline-flex;align-items:center;padding:2px 10px;border-radius:99px;font-size:.71rem;font-weight:700;letter-spacing:.2px}.badge-purple{background:#f3f0ff;color:#6d28d9;border:1px solid #ddd6fe}.badge-pink{background:#fdf2f8;color:#be185d;border:1px solid #fbcfe8}.badge-cyan{background:#ecfeff;color:#0e7490;border:1px solid #a5f3fc}.badge-blue{background:#eff6ff;color:#1d4ed8;border:1px solid #bfdbfe}.search-bar{display:flex;gap:10px;margin-bottom:22px;align-items:center}.search-bar .input{flex:1}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0006;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px;animation:fadeIn .2s ease}.modal{background:var(--surface);border:1px solid var(--border);border-radius:var(--r3);padding:28px;width:100%;max-width:480px;box-shadow:var(--sh-lg);animation:slideUp .28s cubic-bezier(.4,0,.2,1)}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;padding-bottom:14px;border-bottom:1px solid var(--border)}.modal-header h2{font-size:1.05rem;font-weight:800;color:var(--ink)}.modal-footer{display:flex;gap:10px;justify-content:flex-end;margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}.quiz-container{max-width:700px;margin:0 auto}.progress-bar-wrap{height:4px;background:var(--border);border-radius:99px;margin-bottom:28px;overflow:hidden}.progress-bar{height:100%;background:var(--ink);border-radius:99px;transition:width .45s cubic-bezier(.4,0,.2,1)}.question-card{background:var(--ink);border-radius:var(--r3);padding:38px 32px;margin-bottom:20px;text-align:center;box-shadow:var(--sh-md)}.question-label{font-size:.7rem;font-weight:800;color:#ffffff80;text-transform:uppercase;letter-spacing:2px;margin-bottom:14px}.question-term{font-size:2.3rem;font-weight:900;letter-spacing:-1.5px;color:#fff;margin-bottom:12px}.options-grid{display:grid;grid-template-columns:1fr 1fr;gap:11px}.option-btn{background:var(--surface);border:1.5px solid var(--border2);border-radius:var(--r);padding:16px 18px;color:var(--ink);font-family:inherit;font-size:.875rem;font-weight:600;cursor:pointer;transition:var(--trans);text-align:left;display:flex;align-items:flex-start;gap:11px;line-height:1.45;box-shadow:var(--sh)}.option-btn:hover:not(:disabled){border-color:var(--ink);background:var(--bg3);transform:translateY(-1px);box-shadow:var(--sh-md)}.option-btn.correct{border-color:var(--ok)!important;background:var(--ok-bg)!important;color:var(--ok)!important}.option-btn.wrong{border-color:var(--err)!important;background:var(--err-bg)!important;color:var(--err)!important}.option-btn:disabled{cursor:default}.option-letter{display:inline-flex;align-items:center;justify-content:center;min-width:24px;height:24px;border-radius:7px;background:var(--bg3);font-size:.7rem;font-weight:800;flex-shrink:0;margin-top:1px}.timer-bar-wrap{height:5px;background:var(--border);border-radius:99px;margin-bottom:20px;overflow:hidden}.timer-bar{height:100%;border-radius:99px;transition:width 1s linear,background .4s ease}.timer-bar.safe{background:var(--ok)}.timer-bar.warning{background:var(--warn)}.timer-bar.danger{background:var(--err)}.timer-display{font-size:1.9rem;font-weight:900;text-align:center;font-variant-numeric:tabular-nums;margin-bottom:10px;letter-spacing:-1px}.flashcard-scene{perspective:1200px;width:100%;max-width:620px;margin:0 auto 28px;height:290px}.flashcard-inner{position:relative;width:100%;height:100%;transform-style:preserve-3d;transition:transform .6s cubic-bezier(.4,0,.2,1);cursor:pointer}.flashcard-inner.flipped{transform:rotateY(180deg)}.flashcard-face{position:absolute;top:0;right:0;bottom:0;left:0;border-radius:var(--r3);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:38px;backface-visibility:hidden;-webkit-backface-visibility:hidden;text-align:center}.flashcard-front{background:var(--ink);border:1px solid var(--ink);box-shadow:var(--sh-md)}.flashcard-back{background:var(--surface);border:1.5px solid var(--border2);box-shadow:var(--sh-md);transform:rotateY(180deg)}.flashcard-label{font-size:.7rem;font-weight:800;text-transform:uppercase;letter-spacing:2px;margin-bottom:16px}.flashcard-front .flashcard-label{color:#ffffff73}.flashcard-back .flashcard-label{color:var(--ink3)}.flashcard-term{font-size:2.3rem;font-weight:900;letter-spacing:-1.5px;margin-bottom:10px}.flashcard-front .flashcard-term{color:#fff}.flashcard-back .flashcard-term{color:var(--ink);font-size:1.4rem;font-weight:700;letter-spacing:-.5px}.flashcard-def{font-size:1rem;color:var(--ink2);line-height:1.6}.flashcard-nav{display:flex;align-items:center;justify-content:center;gap:14px;margin-bottom:16px}.flashcard-counter{font-size:.88rem;color:var(--ink3);min-width:68px;text-align:center;font-weight:700}.flashcard-actions{display:flex;gap:12px;justify-content:center}.result-screen{max-width:500px;margin:0 auto;text-align:center;padding:20px 20px 40px}.result-emoji{font-size:5rem;margin-bottom:20px;display:block;animation:bounceIn .55s cubic-bezier(.4,0,.2,1)}.result-score{font-size:5rem;font-weight:900;color:var(--ink);letter-spacing:-4px;line-height:1;margin-bottom:10px}.result-title{font-size:1.35rem;font-weight:800;color:var(--ink);margin-bottom:6px}.result-subtitle{color:var(--ink3);font-size:.9rem;margin-bottom:30px}.result-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:11px;margin-bottom:28px}.result-stat{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);padding:16px;box-shadow:var(--sh)}.result-stat-value{font-size:1.5rem;font-weight:900;color:var(--ink)}.result-stat-label{font-size:.74rem;color:var(--ink3);margin-top:4px}.stats-row{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:13px;margin-bottom:26px}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r);padding:20px;text-align:center;box-shadow:var(--sh);transition:var(--trans);position:relative;overflow:hidden}.stat-card:before{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:var(--ink)}.stat-card:hover{box-shadow:var(--sh-md);transform:translateY(-2px)}.stat-card-value{font-size:2.1rem;font-weight:900;color:var(--ink);letter-spacing:-1px}.stat-card-label{font-size:.76rem;color:var(--ink3);margin-top:5px;font-weight:600}.history-timeline{display:flex;flex-direction:column;gap:26px}.history-day-header{display:flex;align-items:center;gap:11px;margin-bottom:13px}.history-day-dot{width:9px;height:9px;border-radius:50%;background:var(--ink);flex-shrink:0}.history-day-label{font-size:.85rem;font-weight:800;color:var(--ink2)}.history-day-words{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:10px;padding-left:20px;border-left:1.5px solid var(--border2);margin-left:4px;padding-top:5px;padding-bottom:8px}.empty-state{text-align:center;padding:64px 20px}.empty-icon{font-size:3.2rem;margin-bottom:14px;opacity:.3}.empty-state p{font-size:.92rem;color:var(--ink2);margin-bottom:18px}.toast{position:fixed;bottom:26px;right:26px;background:var(--ink);color:#fff;border-radius:var(--r);padding:13px 20px;display:flex;align-items:center;gap:9px;font-size:.86rem;font-weight:600;z-index:9999;box-shadow:var(--sh-lg);animation:slideInRight .28s cubic-bezier(.4,0,.2,1)}.toast.success{border-left:3px solid var(--ok)}.toast.error{border-left:3px solid var(--err)}.loading-spinner{display:inline-block;width:20px;height:20px;border:2px solid var(--border2);border-top-color:var(--ink);border-radius:50%;animation:spin .65s linear infinite}.loading-center{display:flex;justify-content:center;align-items:center;padding:64px}.confirm-text{font-size:.9rem;color:var(--ink2);line-height:1.6}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideInRight{0%{opacity:0;transform:translate(18px)}to{opacity:1;transform:translate(0)}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes bounceIn{0%{transform:scale(.4);opacity:0}55%{transform:scale(1.06)}80%{transform:scale(.97)}to{transform:scale(1);opacity:1}}@media (max-width: 768px){.sidebar{width:58px}.sidebar .nav-item span:not(.nav-icon){display:none}.sidebar-logo h1,.sidebar-logo span,.sidebar-stat{display:none}.main-content{margin-left:58px;padding:20px 16px;max-width:calc(100vw - 58px)}.options-grid{grid-template-columns:1fr}.question-term{font-size:1.8rem}.result-score{font-size:3.5rem}}::-webkit-scrollbar{width:5px}::-webkit-scrollbar-track{background:var(--bg3)}::-webkit-scrollbar-thumb{background:var(--border2);border-radius:99px}::-webkit-scrollbar-thumb:hover{background:var(--ink3)}