:root{--bg-primary: #0a0a0f;--bg-secondary: #12121a;--bg-card: #1a1a24;--bg-hover: #22222e;--text-primary: #f0f0f5;--text-secondary: #9090a0;--text-muted: #606070;--accent-python: #3b82f6;--accent-math: #8b5cf6;--accent-success: #10b981;--accent-warning: #f59e0b;--border: #2a2a3a;--radius: 12px;--shadow: 0 4px 24px rgba(0,0,0,.4)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,system-ui,sans-serif;background:var(--bg-primary);color:var(--text-primary);min-height:100vh;line-height:1.6}#app{max-width:1400px;margin:0 auto;padding:2rem}header{text-align:center;margin-bottom:3rem;padding:2rem 0}header h1{font-size:2.5rem;font-weight:700;background:linear-gradient(135deg,var(--accent-python),var(--accent-math));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:.5rem}header .subtitle{color:var(--text-secondary);font-size:1.1rem}header .date{color:var(--text-muted);font-size:.9rem;margin-top:.5rem}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;margin-bottom:2rem}.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;text-align:center;transition:transform .2s,box-shadow .2s}.stat-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.stat-card .number{font-size:2.5rem;font-weight:700;margin-bottom:.25rem}.stat-card.python .number{color:var(--accent-python)}.stat-card.math .number{color:var(--accent-math)}.stat-card.total .number{background:linear-gradient(135deg,var(--accent-python),var(--accent-math));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.stat-card .label{color:var(--text-secondary);font-size:.9rem}.today-focus{background:linear-gradient(135deg,#3b82f61a,#8b5cf61a);border:1px solid rgba(139,92,246,.3);border-radius:var(--radius);padding:2rem;margin-bottom:2rem;position:relative;overflow:hidden}.today-focus:before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--accent-python),var(--accent-math))}.today-focus h2{font-size:1.25rem;margin-bottom:1.5rem;display:flex;align-items:center;gap:.5rem}.today-focus h2:before{content:"🔥"}.focus-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1.5rem}.focus-item{background:var(--bg-card);border-radius:var(--radius);padding:1.5rem}.focus-item h3{font-size:.875rem;text-transform:uppercase;letter-spacing:.05em;color:var(--text-muted);margin-bottom:.5rem}.focus-item.python h3{color:var(--accent-python)}.focus-item.math h3{color:var(--accent-math)}.focus-item .topic{font-size:1.25rem;font-weight:600;margin-bottom:.5rem}.focus-item .description{color:var(--text-secondary);font-size:.95rem}.tracks-section{display:grid;grid-template-columns:repeat(auto-fit,minmax(450px,1fr));gap:2rem}.track-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}.track-header{padding:1.5rem;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center}.track-header h2{display:flex;align-items:center;gap:.75rem;font-size:1.25rem}.track-header .icon{width:36px;height:36px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:1.25rem}.track-card.python .icon{background:#3b82f633}.track-card.math .icon{background:#8b5cf633}.track-header .progress-text{font-size:.875rem;color:var(--text-secondary)}.track-header .progress-text strong{color:var(--text-primary);font-size:1.25rem}.progress-bar{height:8px;background:var(--bg-hover);border-radius:4px;overflow:hidden;margin:1rem 1.5rem}.progress-fill{height:100%;border-radius:4px;transition:width 1s ease-out}.track-card.python .progress-fill{background:var(--accent-python)}.track-card.math .progress-fill{background:var(--accent-math)}.lessons-list{padding:0 1.5rem 1.5rem;max-height:400px;overflow-y:auto}.lesson-item{display:flex;align-items:flex-start;gap:1rem;padding:1rem;border-radius:8px;margin-bottom:.5rem;transition:background .2s}.lesson-item:hover{background:var(--bg-hover)}.lesson-item.completed{opacity:.7}.lesson-item.current{background:var(--bg-hover);border:1px solid var(--border)}.lesson-number{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.75rem;font-weight:600;flex-shrink:0}.track-card.python .lesson-item.completed .lesson-number{background:var(--accent-python);color:#fff}.track-card.python .lesson-item.current .lesson-number{background:transparent;border:2px solid var(--accent-python);color:var(--accent-python)}.track-card.python .lesson-item.pending .lesson-number{background:var(--bg-hover);color:var(--text-muted)}.track-card.math .lesson-item.completed .lesson-number{background:var(--accent-math);color:#fff}.track-card.math .lesson-item.current .lesson-number{background:transparent;border:2px solid var(--accent-math);color:var(--accent-math)}.track-card.math .lesson-item.pending .lesson-number{background:var(--bg-hover);color:var(--text-muted)}.lesson-content{flex:1}.lesson-title{font-weight:500;margin-bottom:.25rem}.lesson-item.completed .lesson-title{text-decoration:line-through;color:var(--text-secondary)}.lesson-meta{font-size:.8rem;color:var(--text-muted)}.code-playground{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:1.5rem;margin-top:2rem}.code-playground h2{margin-bottom:1rem;display:flex;align-items:center;gap:.5rem}.code-playground h2:before{content:"💻"}.code-editor{background:var(--bg-primary);border:1px solid var(--border);border-radius:8px;overflow:hidden}.code-header{background:var(--bg-hover);padding:.75rem 1rem;display:flex;justify-content:space-between;align-items:center;font-size:.875rem;color:var(--text-secondary)}textarea.code-input{width:100%;min-height:200px;background:transparent;border:none;padding:1rem;color:var(--text-primary);font-family:JetBrains Mono,monospace;font-size:.9rem;line-height:1.6;resize:vertical;outline:none}.code-output{background:var(--bg-primary);border-top:1px solid var(--border);padding:1rem;min-height:60px;font-family:JetBrains Mono,monospace;font-size:.9rem}.code-output pre{margin:0;white-space:pre-wrap;word-break:break-word}.code-output .error{color:#ef4444}.code-output .success{color:var(--accent-success)}.run-btn{background:var(--accent-python);color:#fff;border:none;padding:.5rem 1rem;border-radius:6px;font-weight:500;cursor:pointer;transition:opacity .2s}.run-btn:hover{opacity:.9}footer{text-align:center;padding:3rem 0 1rem;color:var(--text-muted);font-size:.875rem}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-secondary)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}@media (max-width: 768px){#app{padding:1rem}header h1{font-size:1.75rem}.tracks-section,.focus-grid{grid-template-columns:1fr}}