:root{--color-bg: #F5F1E8;--color-text: #4A3B32;--color-text-light: #8C7E72;--color-white: #FFFFFF;--color-teal: #00A896;--color-red: #E75A5A;--color-yellow: #EBC944;--color-blue: #2D89EF;--color-green: #27AE60;--color-pink: #D67BB1;--color-purple: #9B59B6;--color-orange: #E67E22;--color-success: #27AE60;--color-error: #C0392B;--shadow-sm: 0 2px 4px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px rgba(0, 0, 0, .05);--shadow-lg: 0 10px 15px rgba(0, 0, 0, .1);--radius-md: 16px;--radius-lg: 24px;--radius-full: 9999px;--font-main: "Inter", sans-serif}*{box-sizing:border-box;margin:0;padding:0}.due-badge{display:none}body{font-family:var(--font-main);background-color:var(--color-bg);color:var(--color-text);line-height:1.5;min-height:100vh;display:flex;flex-direction:column}header{background-color:var(--color-white);padding:1rem 2rem;border-bottom:1px solid rgba(0,0,0,.05);position:sticky;top:0;z-index:10}nav{display:flex;justify-content:space-between;align-items:center;max-width:1000px;margin:0 auto}.logo{font-weight:700;font-size:1.25rem;color:#2c3e50;display:flex;align-items:center;gap:.5rem}.nav-links{list-style:none;display:flex;align-items:center;gap:1.5rem}.nav-links a{display:flex;align-items:center}.nav-back-btn{text-decoration:none;color:var(--color-text);font-weight:600;font-size:.95rem;transition:color .2s}.nav-back-btn:hover{color:var(--color-teal)}.nav-back-btn.hidden{display:none}.profile-link{text-decoration:none;color:var(--color-text-light);font-weight:600;font-size:.95rem;transition:color .2s}.nav-links a.active,.nav-links a:hover{color:var(--color-text)}.profile-link{color:var(--color-text-light)}main{flex:1;padding:2rem 1rem;max-width:1000px;margin:0 auto;width:100%}.hidden{display:none!important}h1{font-weight:800;color:#3e2723;font-size:2rem;margin-bottom:.5rem}.subtitle{color:var(--color-text-light);margin-bottom:2rem;font-size:1.1rem}.streak-banner{background-color:#f3e5c2;border-radius:var(--radius-lg);padding:1.5rem 2rem;display:flex;align-items:center;gap:1.5rem;margin-bottom:2rem;box-shadow:var(--shadow-sm)}.streak-info{flex:1;display:flex;align-items:center;gap:1rem}.streak-icon{background-color:#e69b00;width:48px;height:48px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:1.5rem;color:#fff;box-shadow:0 2px 4px #e69b004d}.streak-text h2{font-size:1.1rem;font-weight:700;color:var(--color-text);margin-bottom:.2rem}.streak-text p{font-size:.9rem;color:var(--color-text-light)}.streak-days{display:flex;gap:.5rem}.day-circle{width:32px;height:32px;border-radius:50%;background-color:#ffffff80;display:flex;align-items:center;justify-content:center;font-size:.8rem;color:var(--color-text-light);font-weight:600}.day-circle.completed{background-color:var(--color-success);color:#fff}.section-header{margin-bottom:1.5rem}.section-header h1{font-size:2rem;font-weight:700;color:#3d2c25;margin-bottom:.5rem}.section-header .subtitle{color:var(--color-text-light);font-size:1.1rem}.deck-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.5rem}.deck-card{padding:1.5rem 1.5rem 3.5rem;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);cursor:pointer;transition:transform .2s,box-shadow .2s;border:none;position:relative;display:flex;flex-direction:column;height:auto;min-height:200px;justify-content:flex-start;overflow:hidden;color:#fff}.deck-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}.deck-icon-circle{width:60px;height:60px;border-radius:50%;background-color:#fff3;display:flex;align-items:center;justify-content:center;font-size:2rem;margin-bottom:1rem;box-shadow:0 4px 8px #0000000d;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.deck-card h3{font-size:1.25rem;font-weight:700;margin-bottom:.25rem;text-shadow:0 1px 2px rgba(0,0,0,.1)}.deck-card p{font-size:.95rem;opacity:.9;line-height:1.4;margin-bottom:0}.deck-card-badge{position:absolute;bottom:1.5rem;left:1.5rem;background-color:#fff;padding:.3rem .8rem;border-radius:var(--radius-full);font-size:.8rem;font-weight:700;color:var(--color-text);box-shadow:0 2px 4px #0000001a}.deck-card.theme-teal{background-color:var(--color-teal)}.deck-card.theme-red{background-color:var(--color-red)}.deck-card.theme-yellow{background-color:var(--color-yellow)}.deck-card.theme-blue{background-color:var(--color-blue)}.deck-card.theme-green{background-color:var(--color-green)}.deck-card.theme-pink{background-color:var(--color-pink)}.deck-card.theme-purple{background-color:var(--color-purple)}.deck-card.theme-orange{background-color:var(--color-orange)}.deck-card.theme-yellow{color:#5d4037}.deck-card.theme-yellow .deck-icon-circle{background-color:#ffffff80}#flashcard-view{position:relative;display:flex;flex-direction:column;align-items:center;gap:2rem;max-width:600px;margin:0 auto}.card-container{-webkit-perspective:1000px;perspective:1000px;width:100%;height:500px}.card{position:relative;width:100%;height:100%;text-align:center;transition:transform .7s cubic-bezier(.175,.885,.32,1.275);-webkit-transform-style:preserve-3d;transform-style:preserve-3d;cursor:pointer}.card.flipped{transform:rotateY(180deg)}.card-face{position:absolute;width:100%;height:100%;top:0;left:0;-webkit-backface-visibility:hidden;backface-visibility:hidden;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:3rem;border-radius:var(--radius-lg);box-shadow:0 20px 60px #0000001f,0 8px 20px #00000014,inset 0 1px #ffffffe6;gap:1rem;overflow:hidden}.card-front{background:linear-gradient(135deg,#fff9f0,#f5ede0);border:2px solid rgba(139,107,74,.15);-webkit-backface-visibility:hidden;backface-visibility:hidden;transform:translateZ(0)}.card.flipped .card-front{pointer-events:none;visibility:hidden;transition:visibility 0s linear .35s}.card:not(.flipped) .card-back{pointer-events:none;visibility:hidden;transition:visibility 0s linear .35s}.card:not(.flipped) .card-front{visibility:visible;transition:visibility 0s linear 0s}.card.flipped .card-back{visibility:visible;transition:visibility 0s linear 0s}.card-front:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background-image:repeating-linear-gradient(90deg,transparent,transparent 2px,rgba(139,107,74,.02) 2px,rgba(139,107,74,.02) 4px),repeating-linear-gradient(0deg,transparent,transparent 2px,rgba(139,107,74,.02) 2px,rgba(139,107,74,.02) 4px);pointer-events:none;opacity:.6}.card-front:after{content:"";position:absolute;top:1.5rem;left:1.5rem;width:60px;height:60px;border-top:3px solid rgba(230,155,0,.25);border-left:3px solid rgba(230,155,0,.25);border-radius:4px 0 0;pointer-events:none}.card-front #card-front-text{font-family:Crimson Text,Georgia,serif;font-size:2.5rem;font-weight:600;color:#3e2723;line-height:1.3;letter-spacing:-.02em;text-shadow:0 2px 4px rgba(0,0,0,.05);z-index:1;position:relative;margin-top:1rem}.card-back{background:linear-gradient(135deg,#f0f6f0,#e8f2e8);border:2px solid rgba(39,174,96,.15);-webkit-backface-visibility:hidden;backface-visibility:hidden;-webkit-transform:rotateY(180deg) translateZ(0);transform:rotateY(180deg) translateZ(0);justify-content:center;padding:2.5rem}.card-back:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background-image:radial-gradient(circle at 20% 80%,rgba(39,174,96,.03) 0%,transparent 50%),radial-gradient(circle at 80% 20%,rgba(39,174,96,.03) 0%,transparent 50%);pointer-events:none}.card-back:after{content:"";position:absolute;bottom:1.5rem;right:1.5rem;width:60px;height:60px;border-bottom:3px solid rgba(39,174,96,.2);border-right:3px solid rgba(39,174,96,.2);border-radius:0 0 4px;pointer-events:none}.audio-btn{position:absolute;top:2rem;right:2rem;width:48px;height:48px;border-radius:50%;border:2px solid rgba(230,155,0,.2);background:#fffc;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);cursor:pointer;font-size:1.25rem;display:flex;align-items:center;justify-content:center;transition:all .3s cubic-bezier(.175,.885,.32,1.275);box-shadow:0 4px 12px #00000014;z-index:10}.audio-btn:hover{transform:scale(1.1);border-color:#e69b0066;background:#fffffff2;box-shadow:0 6px 16px #e69b0033}.audio-btn:active{transform:scale(.95)}.progress-bar{width:100%;height:8px;background:#0000000f;border-radius:var(--radius-full);overflow:hidden;box-shadow:inset 0 2px 4px #0000000d}.progress-fill{height:100%;background:linear-gradient(90deg,#e69b00,#f4b942);border-radius:var(--radius-full);transition:width .4s cubic-bezier(.175,.885,.32,1.275);box-shadow:0 0 8px #e69b0066}.icon-btn{background:var(--color-white);border:2px solid rgba(0,0,0,.08);border-radius:var(--radius-md);padding:.75rem 1.25rem;font-size:1rem;font-weight:600;color:var(--color-text);cursor:pointer;transition:all .2s;font-family:var(--font-main);box-shadow:var(--shadow-sm)}.icon-btn:hover{background:#fafafa;border-color:#0000001f;transform:translate(-4px)}.quiz-options{display:flex;flex-direction:column;gap:.85rem;width:100%;max-width:100%;z-index:1;position:relative}.quiz-btn{background:#fffffff2;border:2px solid rgba(74,144,226,.2);box-shadow:0 3px 10px #00000014,0 1px 3px #0000000d;color:var(--color-text);padding:1rem 1.25rem;border-radius:12px;cursor:pointer;font-size:1.05rem;font-weight:600;transition:all .2s cubic-bezier(.175,.885,.32,1.275);text-align:left;display:flex;align-items:center;gap:.75rem;font-family:var(--font-main);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);position:relative;overflow:hidden}.quiz-btn:before{content:"";position:absolute;top:0;left:0;right:0;bottom:0;background:linear-gradient(135deg,rgba(255,255,255,.1) 0%,transparent 100%);pointer-events:none}.quiz-btn:hover{background:#fff;border-color:#2d89ef66;transform:translateY(-2px) scale(1.01);box-shadow:0 6px 16px #2d89ef26,0 2px 6px #00000014}.quiz-btn:active{transform:translateY(0) scale(.99)}.quiz-btn.correct{background:linear-gradient(135deg,#27ae60,#2ecc71);border-color:#1b8e4b;box-shadow:0 4px 12px #27ae6059,inset 0 1px #ffffff4d;color:#fff;transform:scale(1.02)}.quiz-btn.correct:before{background:linear-gradient(135deg,rgba(255,255,255,.2) 0%,transparent 100%)}.quiz-btn.incorrect{background:linear-gradient(135deg,#e75a5a,#ed6b6b);border-color:#c0392b;box-shadow:0 4px 12px #e75a5a59,inset 0 1px #ffffff4d;color:#fff}.quiz-btn.incorrect:before{background:linear-gradient(135deg,rgba(255,255,255,.15) 0%,transparent 100%)}.controls{display:flex;gap:1rem;width:100%}.btn{flex:1;padding:1.1rem 2rem;border:none;border-radius:var(--radius-md);font-size:1.05rem;font-weight:700;cursor:pointer;transition:all .2s cubic-bezier(.175,.885,.32,1.275);font-family:var(--font-main);position:relative;overflow:hidden}.btn.primary{background:linear-gradient(135deg,#2d89ef,#4a9ff5);color:var(--color-white);box-shadow:0 6px #1565c0,0 8px 16px #2d89ef4d;border:2px solid transparent}.btn.primary:hover{transform:translateY(-2px);box-shadow:0 8px #1565c0,0 12px 20px #2d89ef66}.btn.primary:active{transform:translateY(2px);box-shadow:0 2px #1565c0,0 4px 8px #2d89ef4d}.btn.secondary{background:var(--color-white);color:var(--color-text);border:2px solid rgba(0,0,0,.1);box-shadow:0 4px #00000014,0 6px 12px #0000000d}.btn.secondary:hover{background:#fafafa;transform:translateY(-2px);box-shadow:0 6px #00000014,0 8px 16px #00000014}.btn.secondary:active{transform:translateY(2px);box-shadow:0 2px #00000014,0 4px 8px #0000000d}.feedback-message{position:absolute;top:100px;left:50%;transform:translate(-50%);z-index:50;width:80%;max-width:400px;background:linear-gradient(135deg,#f3e5c2,#f5ede0);border:2px solid rgba(230,155,0,.3);border-radius:var(--radius-md);padding:1rem 1.5rem;text-align:center;font-weight:600;color:var(--color-text);box-shadow:var(--shadow-lg);animation:slideInDown .3s cubic-bezier(.175,.885,.32,1.275)}@keyframes slideInDown{0%{opacity:0;transform:translate(-50%,-20px)}to{opacity:1;transform:translate(-50%)}}.modal{position:fixed;top:0;left:0;width:100%;height:100%;z-index:1000;display:flex;align-items:center;justify-content:center;opacity:1;transition:opacity .3s ease}.modal.hidden{opacity:0;pointer-events:none}.modal-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background-color:#00000080;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.modal-content{position:relative;background-color:var(--color-white);border-radius:var(--radius-lg);box-shadow:0 10px 25px #0000001a;max-width:400px;width:90%;padding:2rem;text-align:center}.modal-header h2{color:var(--color-text);margin-bottom:1rem}.modal-footer{margin-top:2rem;display:flex;justify-content:center;gap:1rem}.mic-btn{position:absolute;top:2rem;left:2rem;width:48px;height:48px;border-radius:50%;border:2px solid rgba(230,155,0,.2);background:#fffc;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);cursor:pointer;font-size:1.25rem;display:flex;align-items:center;justify-content:center;transition:all .3s cubic-bezier(.175,.885,.32,1.275);box-shadow:0 4px 12px #00000014;z-index:10}.mic-btn:hover{transform:scale(1.1);border-color:#e69b0066;background:#fffffff2;box-shadow:0 6px 16px #e69b0033}.mic-btn:active{transform:scale(.95)}.mic-btn.listening{background-color:#e75a5a;color:#fff;animation:pulse 1.5s infinite;border-color:#c0392b}@keyframes pulse{0%{box-shadow:0 0 #e75a5ab3}70%{box-shadow:0 0 0 15px #e75a5a00}to{box-shadow:0 0 #e75a5a00}}@media(max-width:600px){.deck-grid{grid-template-columns:1fr}.streak-banner{flex-direction:column;align-items:flex-start}.streak-days{width:100%;justify-content:space-between}.card-container{height:450px}.card-face{padding:2rem}.card-front{padding:2.5rem 2rem}.card-back{padding:2rem 1.75rem}.card-front #card-front-text{font-size:2rem}.card-front:after,.card-back:after{width:40px;height:40px;border-width:2px}.audio-btn{width:40px;height:40px;font-size:1rem;top:1.5rem;right:1.5rem}.mic-btn{width:40px;height:40px;font-size:1rem;top:1.5rem;left:1.5rem}.quiz-options{gap:.65rem}.quiz-btn{padding:.9rem 1rem;font-size:.95rem}}.language-selector{position:relative}.language-btn{background:none;border:2px solid var(--color-text-light);border-radius:var(--radius-full);padding:.4rem .8rem;font-size:1rem;cursor:pointer;display:flex;align-items:center;gap:.3rem;transition:all .2s ease;color:var(--color-text)}.language-btn:hover:not(:disabled){border-color:var(--color-text);background-color:#00000008}.language-btn:disabled{opacity:.4;cursor:not-allowed}.language-dropdown{position:absolute;top:100%;right:0;margin-top:.5rem;background:var(--color-white);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);overflow:hidden;min-width:140px;z-index:100}.language-dropdown.hidden{display:none}.language-option{display:flex;align-items:center;gap:.5rem;padding:.75rem 1rem;cursor:pointer;transition:background-color .2s ease;font-size:.95rem;color:var(--color-text)}.language-option:hover{background-color:#0000000d}.language-option.active{background-color:#00a8961a;font-weight:600}.language-option .flag{font-size:1.2rem}.language-modal-content{max-width:400px;text-align:center}.language-modal-content .modal-header h2{font-size:1.5rem;color:var(--color-text)}.language-choices{display:flex;justify-content:center;gap:2rem;padding:1.5rem 0}.language-choice{display:flex;flex-direction:column;align-items:center;gap:.75rem;padding:1.5rem 2rem;border:2px solid transparent;border-radius:var(--radius-lg);cursor:pointer;transition:all .2s ease;background:var(--color-bg)}.language-choice:hover{border-color:var(--color-teal);transform:translateY(-2px);box-shadow:var(--shadow-md)}.language-choice .flag{font-size:3rem}.language-choice .name{font-size:1.1rem;font-weight:600;color:var(--color-text)}