@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap";
:root{--bg-primary:#0a0a0f;--bg-secondary:#111118;--bg-tertiary:#1a1a24;--bg-card:#161620b3;--bg-card-hover:#1e1e2dcc;--bg-glass:#ffffff08;--border:#ffffff14;--border-hover:#ffffff26;--text-primary:#e8e8ed;--text-secondary:#8b8b9e;--text-muted:#5a5a6e;--accent-purple:#7c3aed;--accent-purple-soft:#7c3aed26;--accent-blue:#3b82f6;--accent-blue-soft:#3b82f626;--accent-green:#10b981;--accent-green-soft:#10b98126;--accent-orange:#f59e0b;--accent-orange-soft:#f59e0b26;--accent-red:#ef4444;--accent-red-soft:#ef444426;--accent-cyan:#06b6d4;--font-sans:"Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono:"JetBrains Mono", "Fira Code", monospace;--sidebar-width:260px;--header-height:56px;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-xl:20px;--transition-fast:.15s cubic-bezier(.4, 0, .2, 1);--transition-base:.25s cubic-bezier(.4, 0, .2, 1);--transition-slow:.4s cubic-bezier(.4, 0, .2, 1);--shadow-sm:0 1px 2px #0000004d;--shadow-md:0 4px 12px #0006;--shadow-lg:0 8px 32px #00000080;--shadow-glow-purple:0 0 20px #7c3aed4d;--shadow-glow-blue:0 0 20px #3b82f64d}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;font-size:16px}body{font-family:var(--font-sans);background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;min-height:100vh;line-height:1.6}a{color:var(--accent-blue);transition:color var(--transition-fast);text-decoration:none}a:hover{color:var(--accent-purple)}.app-layout{min-height:100vh;display:flex}.sidebar{width:var(--sidebar-width);background:var(--bg-secondary);border-right:1px solid var(--border);z-index:100;transition:transform var(--transition-base);flex-direction:column;display:flex;position:fixed;top:0;bottom:0;left:0}.sidebar-logo{border-bottom:1px solid var(--border);padding:20px 20px 16px}.sidebar-logo h1{background:linear-gradient(135deg, var(--accent-purple), var(--accent-blue));-webkit-text-fill-color:transparent;letter-spacing:-.02em;-webkit-background-clip:text;background-clip:text;font-size:1.1rem;font-weight:700}.sidebar-logo p{color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;margin-top:2px;font-size:.7rem}.sidebar-nav{flex:1;padding:12px 8px;overflow-y:auto}.nav-section-title{color:var(--text-muted);text-transform:uppercase;letter-spacing:.1em;padding:16px 12px 6px;font-size:.65rem;font-weight:600}.nav-item{border-radius:var(--radius-sm);color:var(--text-secondary);transition:all var(--transition-fast);cursor:pointer;align-items:center;gap:10px;padding:8px 12px;font-size:.85rem;font-weight:450;text-decoration:none;display:flex}.nav-item:hover{background:var(--bg-glass);color:var(--text-primary)}.nav-item.active{background:var(--accent-purple-soft);color:var(--accent-purple);font-weight:500}.nav-item .nav-icon{text-align:center;width:20px;font-size:1.1rem}.nav-item .nav-badge{background:var(--bg-tertiary);color:var(--text-muted);border-radius:10px;margin-left:auto;padding:1px 6px;font-size:.7rem}.main-content{margin-left:var(--sidebar-width);flex:1;min-height:100vh}.page-container{max-width:1100px;margin:0 auto;padding:32px 40px}.page-header{margin-bottom:32px}.page-header h1{letter-spacing:-.03em;font-size:1.8rem;font-weight:700}.page-header p{color:var(--text-secondary);margin-top:4px;font-size:.95rem}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);transition:all var(--transition-base);padding:24px}.card:hover{border-color:var(--border-hover);background:var(--bg-card-hover)}.card-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px;display:grid}.progress-bar{background:var(--bg-tertiary);border-radius:3px;height:6px;overflow:hidden}.progress-bar-fill{background:linear-gradient(90deg, var(--accent-purple), var(--accent-blue));height:100%;transition:width var(--transition-slow);border-radius:3px}.progress-bar-fill.green{background:linear-gradient(90deg, var(--accent-green), var(--accent-cyan))}.stats-row{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:12px;margin-bottom:24px;display:grid}.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);flex-direction:column;gap:4px;padding:16px 20px;display:flex}.stat-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.06em;font-size:.75rem}.stat-value{letter-spacing:-.02em;font-size:1.6rem;font-weight:700}.stat-value.purple{color:var(--accent-purple)}.stat-value.blue{color:var(--accent-blue)}.stat-value.green{color:var(--accent-green)}.stat-value.orange{color:var(--accent-orange)}.module-card{cursor:pointer;flex-direction:column;gap:12px;display:flex}.module-card .module-header{align-items:center;gap:12px;display:flex}.module-card .module-icon{border-radius:var(--radius-md);flex-shrink:0;justify-content:center;align-items:center;width:40px;height:40px;font-size:1.2rem;display:flex}.module-card .module-title{letter-spacing:-.01em;font-size:.95rem;font-weight:600}.module-card .module-desc{color:var(--text-secondary);font-size:.8rem;line-height:1.5}.module-card .module-meta{color:var(--text-muted);gap:16px;font-size:.75rem;display:flex}.badge{text-transform:uppercase;letter-spacing:.04em;border-radius:20px;align-items:center;gap:4px;padding:3px 10px;font-size:.7rem;font-weight:500;display:inline-flex}.badge.completed{background:var(--accent-green-soft);color:var(--accent-green)}.badge.in-progress{background:var(--accent-blue-soft);color:var(--accent-blue)}.badge.not-started{background:var(--bg-tertiary);color:var(--text-muted)}.badge.locked{background:var(--bg-tertiary);color:var(--text-muted);opacity:.5}.btn{border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);font-size:.85rem;font-weight:500;font-family:var(--font-sans);border:none;align-items:center;gap:8px;padding:10px 20px;display:inline-flex}.btn-primary{background:linear-gradient(135deg, var(--accent-purple), var(--accent-blue));color:#fff}.btn-primary:hover{box-shadow:var(--shadow-glow-purple);transform:translateY(-1px)}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover{border-color:var(--border-hover);background:var(--bg-card-hover)}.btn-sm{padding:6px 14px;font-size:.8rem}.btn-icon{border-radius:var(--radius-sm);padding:8px}.markdown-body{color:var(--text-primary);font-size:.95rem;line-height:1.75}.markdown-body h1{letter-spacing:-.03em;margin:32px 0 16px;font-size:1.8rem;font-weight:700}.markdown-body h2{letter-spacing:-.02em;border-bottom:1px solid var(--border);margin:28px 0 12px;padding-bottom:8px;font-size:1.4rem;font-weight:650}.markdown-body h3{margin:24px 0 8px;font-size:1.15rem;font-weight:600}.markdown-body h4{color:var(--text-secondary);margin:20px 0 6px;font-size:1rem;font-weight:600}.markdown-body p{margin:12px 0}.markdown-body code{font-family:var(--font-mono);background:var(--bg-tertiary);color:var(--accent-cyan);border-radius:4px;padding:2px 6px;font-size:.85em}.markdown-body pre{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-md);margin:16px 0;padding:16px 20px;overflow-x:auto}.markdown-body pre code{color:var(--text-primary);background:0 0;padding:0;font-size:.82rem;line-height:1.6}.markdown-body ul,.markdown-body ol{margin:8px 0;padding-left:24px}.markdown-body li{margin:4px 0}.markdown-body table{border-collapse:collapse;width:100%;margin:16px 0;font-size:.88rem}.markdown-body th{background:var(--bg-tertiary);text-align:left;border:1px solid var(--border);padding:10px 14px;font-weight:600}.markdown-body td{border:1px solid var(--border);padding:10px 14px}.markdown-body blockquote{border-left:3px solid var(--accent-purple);background:var(--accent-purple-soft);border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:var(--text-secondary);margin:16px 0;padding:8px 16px}.markdown-body strong{color:var(--text-primary);font-weight:600}.markdown-body img{border-radius:var(--radius-md);max-width:100%}.markdown-body .alert{border-radius:var(--radius-sm);border-left:4px solid;margin:16px 0;padding:12px 16px}.markdown-body .alert-note{background:var(--accent-blue-soft);border-color:var(--accent-blue)}.markdown-body .alert-tip{background:var(--accent-green-soft);border-color:var(--accent-green)}.markdown-body .alert-important{background:var(--accent-purple-soft);border-color:var(--accent-purple)}.markdown-body .alert-warning{background:var(--accent-orange-soft);border-color:var(--accent-orange)}.markdown-body .alert-caution{background:var(--accent-red-soft);border-color:var(--accent-red)}.lesson-layout{min-height:calc(100vh - var(--header-height));gap:0;display:flex}.lesson-content{flex:1;max-width:800px;padding:32px 40px;overflow-y:auto}.lesson-sidebar{border-left:1px solid var(--border);width:280px;height:100vh;padding:24px;position:sticky;top:0;overflow-y:auto}.lesson-toolbar{background:var(--bg-secondary);border-bottom:1px solid var(--border);align-items:center;gap:8px;padding:8px 16px;display:flex}.lesson-toolbar .tab{border-radius:var(--radius-sm);cursor:pointer;color:var(--text-secondary);transition:all var(--transition-fast);font-size:.8rem;font-weight:500;font-family:var(--font-sans);background:0 0;border:none;padding:6px 14px}.lesson-toolbar .tab.active{background:var(--accent-purple-soft);color:var(--accent-purple)}.lesson-toolbar .tab:hover:not(.active){color:var(--text-primary)}.split-view{height:calc(100vh - var(--header-height) - 44px);display:flex}.split-editor{border-right:1px solid var(--border);flex:1}.split-preview{flex:1;padding:32px;overflow-y:auto}.quiz-question{margin-bottom:24px}.quiz-question h3{margin-bottom:12px;font-size:1rem;font-weight:600}.quiz-option{border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);align-items:center;gap:10px;margin-bottom:8px;padding:10px 16px;font-size:.88rem;display:flex}.quiz-option:hover{border-color:var(--border-hover);background:var(--bg-glass)}.quiz-option.selected{border-color:var(--accent-purple);background:var(--accent-purple-soft)}.quiz-option.correct{border-color:var(--accent-green);background:var(--accent-green-soft)}.quiz-option.wrong{border-color:var(--accent-red);background:var(--accent-red-soft)}.week-card{margin-bottom:16px}.week-header{justify-content:space-between;align-items:center;margin-bottom:12px;display:flex}.week-header h3{font-size:1rem;font-weight:600}.day-row{border-radius:var(--radius-sm);align-items:center;gap:12px;margin-bottom:4px;padding:8px 12px;font-size:.85rem;display:flex}.day-row:hover{background:var(--bg-glass)}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.animate-in{animation:fadeIn var(--transition-base) ease-out}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}.skeleton{background:linear-gradient(90deg, var(--bg-tertiary) 25%, var(--bg-card) 50%, var(--bg-tertiary) 75%);border-radius:var(--radius-sm);background-size:200% 100%;animation:1.5s infinite shimmer}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--border-hover)}.toast{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);z-index:1000;animation:fadeIn var(--transition-base) ease-out;padding:12px 20px;font-size:.85rem;position:fixed;bottom:24px;right:24px}