@import "https://cdn.orzatty.com/fonts/css2?family=Inter:wght@300;400;500;600;700;800&display=swap";:root{--bg-primary:#fff;--bg-secondary:#f7f8fa;--bg-card:#fff;--bg-sidebar:#f1f3f5;--bg-hover:#f0f2f5;--text-primary:#1a1a2e;--text-secondary:#6b7280;--text-tertiary:#9ca3af;--accent:#4f46e5;--accent-hover:#4338ca;--accent-light:#eef2ff;--accent-text:#fff;--success:#059669;--success-light:#ecfdf5;--warning:#d97706;--warning-light:#fffbeb;--error:#dc2626;--border:#e5e7eb;--border-strong:#d1d5db;--shadow-sm:0 1px 2px #0000000d;--shadow-md:0 4px 6px -1px #00000012, 0 2px 4px -2px #0000000d;--shadow-lg:0 10px 15px -3px #00000014, 0 4px 6px -4px #0000000a;--shadow-xl:0 20px 25px -5px #00000014, 0 8px 10px -6px #0000000a;--radius-sm:6px;--radius-md:10px;--radius-lg:14px;--radius-xl:20px;--font-sans:"Inter", system-ui, -apple-system, sans-serif;--transition:.2s cubic-bezier(.4, 0, .2, 1)}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-sans);background-color:var(--bg-secondary);color:var(--text-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;line-height:1.6}a{color:inherit;text-decoration:none}img{max-width:100%;display:block}h1,h2,h3,h4{color:var(--text-primary);font-weight:700;line-height:1.25}.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}.container-narrow{max-width:800px;margin:0 auto;padding:0 1.5rem}.navbar{background-color:var(--bg-primary);border-bottom:1px solid var(--border);z-index:100;height:64px;box-shadow:var(--shadow-sm);justify-content:space-between;align-items:center;padding:0 2rem;display:flex;position:sticky;top:0}.logo{letter-spacing:-.5px;color:var(--text-primary);align-items:center;gap:.5rem;font-size:1.25rem;font-weight:800;display:flex}.logo span{color:var(--accent)}.nav-links{align-items:center;gap:.25rem;display:flex}.nav-link{color:var(--text-secondary);border-radius:var(--radius-md);transition:all var(--transition);padding:.5rem .875rem;font-size:.925rem;font-weight:500}.nav-link:hover{color:var(--text-primary);background-color:var(--bg-hover)}.nav-link.active{color:var(--accent);background-color:var(--accent-light)}.nav-auth{align-items:center;gap:.75rem;display:flex}.btn{background-color:var(--accent);color:var(--accent-text);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition);font-size:.925rem;font-weight:600;font-family:var(--font-sans);border:none;justify-content:center;align-items:center;gap:.5rem;padding:.625rem 1.25rem;line-height:1.4;display:inline-flex}.btn:hover{background-color:var(--accent-hover);transform:translateY(-1px);box-shadow:0 4px 12px #4f46e540}.btn:active{transform:translateY(0)}.btn-outline{color:var(--text-primary);border:1px solid var(--border-strong);background-color:#0000}.btn-outline:hover{background-color:var(--bg-hover);box-shadow:none;border-color:var(--text-secondary)}.btn-sm{padding:.375rem .75rem;font-size:.825rem}.btn-lg{padding:.875rem 2rem;font-size:1.05rem}.btn-success{background-color:var(--success)}.btn-success:hover{background-color:#047857;box-shadow:0 4px 12px #05966940}.card{background-color:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);transition:all var(--transition);padding:1.5rem}.card:hover{box-shadow:var(--shadow-lg);border-color:var(--border-strong)}.card-clickable{cursor:pointer}.card-clickable:hover{transform:translateY(-2px)}.course-card{flex-direction:column;padding:0;display:flex;overflow:hidden}.course-card .course-cover{background-color:var(--bg-secondary);justify-content:center;align-items:center;height:180px;display:flex;position:relative;overflow:hidden}.course-card .course-cover .cover-icon{color:var(--text-tertiary);opacity:.5}.course-card .course-body{flex-direction:column;flex-grow:1;padding:1.25rem;display:flex}.course-card .course-body h3{margin-bottom:.5rem;font-size:1.1rem}.course-card .course-body p{color:var(--text-secondary);flex-grow:1;margin-bottom:1rem;font-size:.9rem}.course-card .course-meta{color:var(--text-tertiary);border-top:1px solid var(--border);align-items:center;gap:1rem;padding-top:.75rem;font-size:.8rem;display:flex}.badge{background-color:var(--accent-light);color:var(--accent);border-radius:999px;align-items:center;gap:.25rem;padding:.2rem .5rem;font-size:.75rem;font-weight:600;display:inline-flex}.badge-success{background-color:var(--success-light);color:var(--success)}.badge-warning{background-color:var(--warning-light);color:var(--warning)}.progress-bar{background-color:var(--bg-secondary);border-radius:999px;width:100%;height:6px;overflow:hidden}.progress-bar .progress-fill{background-color:var(--accent);border-radius:999px;height:100%;transition:width .5s}.progress-bar .progress-fill.complete{background-color:var(--success)}.hero{text-align:center;background:linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);padding:5rem 0 4rem}.hero h1{letter-spacing:-1px;margin-bottom:1.25rem;font-size:3rem}.hero p{color:var(--text-secondary);max-width:620px;margin:0 auto 2.5rem;font-size:1.15rem;line-height:1.7}.hero-actions{flex-wrap:wrap;justify-content:center;gap:.75rem;display:flex}.features-section{padding:5rem 0}.features-section h2{text-align:center;margin-bottom:.75rem;font-size:2rem}.features-section .subtitle{text-align:center;color:var(--text-secondary);margin-bottom:3rem;font-size:1.05rem}.features-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1.5rem;display:grid}.feature-card{padding:2rem}.feature-card .feature-icon{background-color:var(--accent-light);border-radius:var(--radius-md);width:48px;height:48px;color:var(--accent);justify-content:center;align-items:center;margin-bottom:1.25rem;display:flex}.feature-card h3{margin-bottom:.5rem;font-size:1.15rem}.feature-card p{color:var(--text-secondary);font-size:.925rem;line-height:1.6}.stats-bar{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:1rem;padding:3rem 0;display:grid}.stat-item{text-align:center}.stat-item .stat-value{color:var(--accent);font-size:2.5rem;font-weight:800;line-height:1}.stat-item .stat-label{color:var(--text-secondary);margin-top:.25rem;font-size:.875rem}.course-viewer{grid-template-columns:300px 1fr;gap:0;min-height:calc(100vh - 64px);display:grid}.course-sidebar{background-color:var(--bg-primary);border-right:1px solid var(--border);height:calc(100vh - 64px);padding:1.5rem;position:sticky;top:64px;overflow-y:auto}.course-sidebar h2{border-bottom:1px solid var(--border);margin-bottom:1.5rem;padding-bottom:1rem;font-size:1.15rem}.sidebar-module{margin-bottom:1.25rem}.sidebar-module h4{color:var(--text-tertiary);text-transform:uppercase;letter-spacing:.5px;margin-bottom:.5rem;padding:0 .5rem;font-size:.8rem;font-weight:600}.sidebar-lesson{border-radius:var(--radius-sm);color:var(--text-secondary);cursor:pointer;transition:all var(--transition);align-items:center;gap:.75rem;padding:.625rem .75rem;font-size:.9rem;display:flex}.sidebar-lesson:hover{background-color:var(--bg-hover);color:var(--text-primary)}.sidebar-lesson.active{background-color:var(--accent-light);color:var(--accent);font-weight:500}.sidebar-lesson.completed{color:var(--success)}.sidebar-lesson .lesson-check{border:2px solid var(--border-strong);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:20px;height:20px;font-size:.7rem;display:flex}.sidebar-lesson.completed .lesson-check{background-color:var(--success);border-color:var(--success);color:#fff}.sidebar-lesson.active .lesson-check{border-color:var(--accent)}.course-content{max-width:860px;padding:2.5rem 3rem}.course-content h1{margin-bottom:.5rem;font-size:2rem}.course-content .lesson-meta{color:var(--text-tertiary);border-bottom:1px solid var(--border);align-items:center;gap:1rem;margin-bottom:2rem;padding-bottom:1.5rem;font-size:.875rem;display:flex}.course-content .lesson-body{color:var(--text-primary);font-size:1.05rem;line-height:1.8}.course-content .lesson-body p{margin-bottom:1.25rem}.course-content .lesson-body h2{margin-top:2.5rem;margin-bottom:1rem;font-size:1.5rem}.course-content .lesson-body h3{margin-top:2rem;margin-bottom:.75rem;font-size:1.2rem}.course-content .lesson-body pre{background-color:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-md);margin-bottom:1.5rem;padding:1.25rem;font-size:.9rem;line-height:1.6;overflow-x:auto}.course-content .lesson-body code{background-color:var(--bg-secondary);border-radius:4px;padding:.15rem .4rem;font-family:JetBrains Mono,Fira Code,monospace;font-size:.875em}.course-content .lesson-body pre code{background:0 0;padding:0}.course-content .lesson-body blockquote{border-left:4px solid var(--accent);background-color:var(--accent-light);border-radius:0 var(--radius-md) var(--radius-md) 0;color:var(--text-secondary);margin:1.5rem 0;padding:1rem 1.5rem}.lesson-nav{border-top:1px solid var(--border);justify-content:space-between;align-items:center;margin-top:3rem;padding-top:2rem;display:flex}.site-footer{background-color:var(--bg-primary);border-top:1px solid var(--border);margin-top:4rem;padding:3rem 2rem}.footer-content{grid-template-columns:2fr 1fr 1fr 1fr;gap:3rem;max-width:1200px;margin:0 auto;display:grid}.footer-brand p{color:var(--text-secondary);margin-top:.75rem;font-size:.9rem;line-height:1.6}.footer-col h4{text-transform:uppercase;letter-spacing:.5px;color:var(--text-tertiary);margin-bottom:1rem;font-size:.8rem;font-weight:600}.footer-col a{color:var(--text-secondary);transition:color var(--transition);padding:.3rem 0;font-size:.9rem;display:block}.footer-col a:hover{color:var(--accent)}.footer-bottom{border-top:1px solid var(--border);max-width:1200px;color:var(--text-tertiary);justify-content:space-between;align-items:center;margin:2rem auto 0;padding-top:1.5rem;font-size:.825rem;display:flex}@media (width<=768px){.navbar{padding:0 1rem}.nav-links{display:none}.hero h1{font-size:2rem}.hero p{font-size:1rem}.course-viewer{grid-template-columns:1fr}.course-sidebar{border-right:none;border-bottom:1px solid var(--border);height:auto;position:relative;top:auto}.course-content{padding:1.5rem}.footer-content{grid-template-columns:1fr;gap:2rem}.footer-bottom{text-align:center;flex-direction:column;gap:.5rem}}