:root{--primary-h:142;--primary-s:72%;--primary-l:45%;--primary:hsl(var(--primary-h), var(--primary-s), var(--primary-l));--primary-hover:hsl(var(--primary-h), var(--primary-s), calc(var(--primary-l) - 8%));--primary-light:hsl(var(--primary-h), var(--primary-s), 95%);--body-bg:#f8fafc;--background:#f8fafc66;--foreground:#020817;--card:#ffffff8c;--card-foreground:#020817;--card-hover:#f1f5f9b3;--muted:#f1f5f9a6;--muted-foreground:#64748b;--border:#e2e8f099;--radius:12px}[data-theme=dark]{--body-bg:#020617;--background:#0206118c;--foreground:#f8fafc;--card:#0f172aa6;--card-foreground:#f8fafc;--card-hover:#1e293bbf;--muted:#1e293ba6;--muted-foreground:#94a3b8;--border:#33415580;--primary-light:hsl(var(--primary-h), var(--primary-s), 12%)}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--body-bg);color:var(--foreground);height:100vh;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;transition:background-color .3s,color .3s;overflow:hidden}.app-container{z-index:1;pointer-events:auto;background-color:#0000;grid-template-columns:260px 1fr;width:100vw;height:100vh;display:grid;position:relative}@media (width<=768px){.app-container{grid-template-columns:1fr}}.sidebar{background-color:var(--background);border-right:1px solid var(--border);-webkit-backdrop-filter:blur(16px);flex-direction:column;justify-content:space-between;height:100%;padding:32px 18px 24px;display:flex}@media (width<=768px){.sidebar{display:none}}.brand-section{align-items:center;gap:12px;margin-bottom:40px;padding:0 12px;display:flex}.brand-logo{font-size:24px}.brand-name{letter-spacing:-1px;color:var(--primary);font-size:22px;font-weight:900}.nav-links{flex-direction:column;flex-grow:1;gap:8px;display:flex}.nav-item{border-radius:var(--radius);color:var(--muted-foreground);cursor:pointer;text-align:left;background:0 0;border:none;align-items:center;gap:14px;padding:12px 16px;font-size:14px;font-weight:600;text-decoration:none;transition:all .2s cubic-bezier(.4,0,.2,1);display:flex}.nav-item:hover{background-color:var(--muted);color:var(--foreground)}.nav-item.active{background-color:var(--primary-light);color:var(--primary);border-right:2px solid var(--primary);border-radius:var(--radius) 0 0 var(--radius)}.main-wrapper{flex-direction:column;height:100vh;display:flex;overflow:hidden}.top-bar{border-bottom:1px solid var(--border);background-color:var(--card);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);justify-content:space-between;align-items:center;height:64px;padding:0 32px;display:flex}.top-bar-title{letter-spacing:-.5px;font-size:20px;font-weight:700}.theme-toggle-btn{border:1px solid var(--border);cursor:pointer;color:var(--foreground);background:0 0;border-radius:8px;align-items:center;gap:8px;padding:8px 14px;font-size:13px;font-weight:500;transition:all .2s;display:flex}.theme-toggle-btn:hover{background-color:var(--muted)}.main-content{background-color:#0000;flex-grow:1;padding:32px 40px;overflow-y:auto}.dashboard-grid{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:24px;margin-bottom:32px;display:grid}.stat-card{background-color:var(--card);border:1px solid var(--border);border-radius:var(--radius);-webkit-backdrop-filter:blur(12px);align-items:center;gap:20px;padding:24px;transition:all .3s cubic-bezier(.4,0,.2,1);display:flex;position:relative;overflow:hidden;box-shadow:0 1px 3px #00000005}.stat-card:after{content:"";background:radial-gradient(circle, var(--primary-light) 0%, transparent 70%);opacity:0;width:64px;height:64px;transition:opacity .3s;position:absolute;top:0;right:0}.stat-card:hover{border-color:var(--muted-foreground);transform:translateY(-2px);box-shadow:0 4px 20px #0000000d}.stat-card:hover:after{opacity:1}.stat-icon{background-color:var(--primary-light);color:var(--primary);border-radius:10px;justify-content:center;align-items:center;width:48px;height:48px;display:flex}.stat-value{letter-spacing:-.5px;font-size:28px;font-weight:800}.stat-label{color:var(--muted-foreground);font-size:13px;font-weight:500}.dashboard-details{grid-template-columns:2fr 1fr;gap:24px;display:grid}@media (width<=992px){.dashboard-details{grid-template-columns:1fr}}.card-container{background-color:var(--card);border:1px solid var(--border);border-radius:var(--radius);-webkit-backdrop-filter:blur(12px);padding:24px}.card-header-title{justify-content:space-between;align-items:center;margin-bottom:20px;font-size:18px;font-weight:700;display:flex}.list-item{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:16px 0;display:flex}.list-item:last-child{border-bottom:none;padding-bottom:0}.list-item-info{flex-direction:column;gap:4px;display:flex}.list-item-title{font-size:14px;font-weight:600}.list-item-desc{color:var(--muted-foreground);font-size:12px}.chart-container{justify-content:space-between;align-items:flex-end;height:180px;margin-top:24px;display:flex}.chart-bar-wrapper{flex-direction:column;justify-content:flex-end;align-items:center;width:10%;height:100%;display:flex;position:relative}.chart-bar{background-color:var(--muted);cursor:pointer;border-radius:4px 4px 0 0;width:100%;transition:all .3s cubic-bezier(.4,0,.2,1);position:relative}.chart-bar:hover{background-color:var(--primary);opacity:.8}.chart-bar.active{background-color:var(--primary)}.chart-bar-tooltip{background-color:var(--foreground);color:var(--background);opacity:0;pointer-events:none;border-radius:4px;padding:4px 8px;font-size:11px;font-weight:600;transition:opacity .2s;position:absolute;top:-30px;left:50%;transform:translate(-50%)}.chart-bar-wrapper:hover .chart-bar-tooltip{opacity:1}.chart-label{color:var(--muted-foreground);margin-top:8px;font-size:11px;font-weight:500}.mentor-container{grid-template-columns:3fr 1fr;gap:24px;height:calc(100vh - 130px);display:grid}@media (width<=992px){.mentor-container{grid-template-columns:1fr}.mentor-hints-panel{display:none}}.chat-panel{border:1px solid var(--border);border-radius:var(--radius);background-color:var(--card);flex-direction:column;height:100%;display:flex;overflow:hidden}.chat-history{flex-direction:column;flex-grow:1;gap:16px;padding:24px;display:flex;overflow-y:auto}.chat-bubble{border-radius:16px;max-width:80%;padding:14px 18px;font-size:14px;line-height:1.5}.chat-bubble.assistant{background-color:var(--muted);color:var(--foreground);border-top-left-radius:4px;align-self:flex-start}.chat-bubble.user{background-color:var(--primary);color:#fff;border-top-right-radius:4px;align-self:flex-end}.chat-input-bar{border-top:1px solid var(--border);gap:12px;padding:16px 24px;display:flex}.chat-input{border:1px solid var(--border);background-color:var(--background);color:var(--foreground);border-radius:8px;outline:none;flex-grow:1;padding:12px 16px;font-size:14px}.chat-input:focus{border-color:var(--primary)}.send-btn{background-color:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:8px;padding:12px 24px;font-weight:600;transition:background-color .2s}.send-btn:hover{background-color:var(--primary-hover)}.mentor-hints-panel{border:1px solid var(--border);border-radius:var(--radius);background-color:var(--card);padding:20px}.hint-bubble{background-color:var(--muted);border-left:3px solid var(--primary);cursor:pointer;color:var(--foreground);border-radius:4px;margin-bottom:12px;padding:12px;font-size:13px;transition:all .2s cubic-bezier(.4,0,.2,1)}.hint-bubble:hover{background-color:var(--card-hover);transform:translate(4px);box-shadow:0 2px 8px #0000000d}.reader-container{grid-template-columns:280px 1fr;gap:24px;height:calc(100vh - 130px);display:grid}@media (width<=992px){.reader-container{grid-template-columns:1fr}.reader-sidebar{display:none}}.reader-sidebar{border:1px solid var(--border);border-radius:var(--radius);background-color:var(--card);padding:16px;overflow-y:auto}.reader-list-item{cursor:pointer;color:var(--muted-foreground);border-radius:8px;margin-bottom:6px;padding:12px;font-size:14px;font-weight:600;transition:background-color .2s}.reader-list-item:hover{background-color:var(--muted);color:var(--foreground)}.reader-list-item.active{background-color:var(--primary-light);color:var(--primary)}.reader-content-panel{border:1px solid var(--border);border-radius:var(--radius);background-color:var(--card);flex-direction:column;height:100%;display:flex;overflow:hidden}.reader-body{flex-grow:1;padding:32px;line-height:1.6;overflow-y:auto}.reader-body h3{margin-top:24px;margin-bottom:16px;font-size:18px;font-weight:700}.reader-body p{color:var(--muted-foreground);margin-bottom:16px;font-size:14px}.reader-body ul,.reader-body ol{color:var(--muted-foreground);margin-bottom:16px;margin-left:24px;font-size:14px}.reader-body li{margin-bottom:8px}.reader-body blockquote{border-left:4px solid var(--primary);background-color:var(--primary-light);color:var(--foreground);border-radius:4px;margin-bottom:24px;padding:16px 20px;font-size:14px;font-style:italic}.data-table{border-collapse:collapse;width:100%;margin:24px 0}.data-table th,.data-table td{border:1px solid var(--border);text-align:left;padding:12px 16px;font-size:13px}.data-table th{background-color:var(--muted);font-weight:700}.reader-footer{border-top:1px solid var(--border);background-color:var(--card);justify-content:flex-end;padding:16px 24px;display:flex}.flashcards-container{flex-direction:column;align-items:center;gap:32px;padding-top:40px;display:flex}.card-scene{perspective:1000px;width:480px;height:300px}@media (width<=576px){.card-scene{width:100%;height:260px}}.flashcard{width:100%;height:100%;transform-style:preserve-3d;cursor:pointer;transition:transform .6s cubic-bezier(.4,0,.2,1);position:relative}.flashcard.is-flipped{transform:rotateY(180deg)}.card-face{backface-visibility:hidden;border:1px solid var(--border);text-align:center;border-radius:16px;flex-direction:column;justify-content:center;align-items:center;width:100%;height:100%;padding:40px;display:flex;position:absolute;box-shadow:0 4px 20px #0000000a}.card-face.front{background-color:var(--card);color:var(--foreground)}.card-face.back{background-color:var(--primary-light);border-color:var(--primary);color:var(--foreground);transform:rotateY(180deg)}.card-question{letter-spacing:-.5px;font-size:22px;font-weight:700;line-height:1.4}.card-answer{font-size:18px;font-weight:600;line-height:1.5}.card-prompt-text{color:var(--muted-foreground);text-transform:uppercase;letter-spacing:1.5px;font-size:11px;font-weight:600;position:absolute;bottom:20px}.card-controls{align-items:center;gap:16px;display:flex}.rating-btn{cursor:pointer;border:none;border-radius:8px;align-items:center;gap:8px;padding:12px 24px;font-size:13px;font-weight:700;transition:all .2s;display:flex}.rating-btn.again{color:#db2424;background-color:#ffebeb}.rating-btn.again:hover{background-color:#ffd6d6}.rating-btn.easy{background-color:var(--primary-light);color:var(--primary)}.rating-btn.easy:hover{background-color:hsl(var(--primary-h), var(--primary-s), 90%)}.modal-overlay{-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);z-index:1000;background-color:#02061199;justify-content:center;align-items:center;width:100vw;height:100vh;display:flex;position:fixed;top:0;left:0}.modal-content{background-color:var(--card);border-radius:var(--radius);border:1px solid var(--border);flex-direction:column;gap:20px;width:550px;max-width:90%;padding:32px;display:flex;box-shadow:0 25px 50px -12px #00000040}.quiz-option{border:1px solid var(--border);cursor:pointer;text-align:left;width:100%;color:var(--foreground);background:0 0;border-radius:8px;padding:14px 18px;font-size:14px;font-weight:500;transition:all .2s}.quiz-option:hover{background-color:var(--muted)}.quiz-option.correct{color:#0f5729;background-color:#e1faea;border-color:#22c35d}.quiz-option.incorrect{color:#6e1212;background-color:#ffe6e6;border-color:#db2424}.explanation-box{background-color:var(--muted);color:var(--foreground);border-left:3px solid var(--muted-foreground);border-radius:8px;padding:16px;font-size:13px;line-height:1.5}.action-btn{background-color:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:8px;padding:12px 24px;font-size:13px;font-weight:700;transition:background-color .2s}.action-btn:hover{background-color:var(--primary-hover)}