@import "https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap";
:root{--primary:#4f46e5;--primary-glow:#4f46e51a;--secondary:#7c3aed;--accent:#0891b2;--bg-dark:#f8fafc;--surface:#fff;--border:#e2e8f0;--text:#0f172a;--text-muted:#64748b;--transition-speed:.3s;--ease:cubic-bezier(.4, 0, .2, 1)}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-dark);color:var(--text);-webkit-font-smoothing:antialiased;font-family:Plus Jakarta Sans,sans-serif;line-height:1.6;overflow-x:hidden}.glass{background:var(--surface);border:1px solid var(--border);box-shadow:0 4px 6px -1px #0000000d,0 2px 4px -1px #00000008}.glass-dark{border:1px solid var(--border);background:#f1f5f9}.gradient-text{background:linear-gradient(135deg,#0f172a 0%,#475569 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.gradient-primary{background:linear-gradient(135deg, var(--primary), var(--secondary));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}.card-shine{position:relative;overflow:hidden}.card-shine:after{content:"";background:linear-gradient(90deg,#0000,#ffffff0d,#0000);width:50%;height:100%;transition:all .75s;position:absolute;top:0;left:-100%;transform:skew(-25deg)}.card-shine:hover:after{left:150%}.btn{cursor:pointer;transition:all var(--transition-speed) var(--ease);border:1px solid #0000;border-radius:12px;align-items:center;gap:.5rem;padding:.75rem 1.5rem;font-size:.95rem;font-weight:600;text-decoration:none;display:inline-flex}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 4px 14px #6366f163}.btn-primary:hover{background:#4f46e5;transform:translateY(-2px);box-shadow:0 6px 20px #6366f13b}.btn-outline{border-color:var(--border);color:var(--text);background:0 0}.btn-outline:hover{background:#ffffff0d;border-color:#fff3;transform:translateY(-2px)}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.animate-fade{animation:fadeIn .6s var(--ease) forwards}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg-dark)}::-webkit-scrollbar-thumb{background:#222;border-radius:10px}::-webkit-scrollbar-thumb:hover{background:#333}
.page-wrapper{background:var(--bg-dark);min-height:100vh;color:var(--text);flex-direction:column;padding-top:4rem;padding-bottom:4rem;display:flex;position:relative;overflow:hidden}.noise-overlay{z-index:0;pointer-events:none;opacity:.4;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.02'/%3E%3C/svg%3E");position:fixed;inset:0}.bg-radial{z-index:0;background:radial-gradient(circle,#4f46e50d 0%,#0000 70%);width:1000px;height:600px;position:fixed;top:-10%;left:50%;transform:translate(-50%)}.main-container{z-index:1;flex:1;width:100%;max-width:1140px;margin:0 auto;padding:0 1.75rem;position:relative}.header{text-align:center;flex-direction:column;align-items:center;margin-bottom:5rem;display:flex}.badge{border:1px solid var(--border);letter-spacing:.05em;text-transform:uppercase;color:var(--primary);background:#fff;border-radius:9999px;align-items:center;gap:.5rem;margin-bottom:1.5rem;padding:.5rem 1rem;font-size:.75rem;font-weight:700;display:inline-flex;box-shadow:0 1px 2px #0000000d}.badge-dot{background:var(--primary);border-radius:50%;width:8px;height:8px}.title{letter-spacing:-.04em;color:var(--text);margin-bottom:1.5rem;font-size:clamp(2.5rem,6vw,4rem);font-weight:800;line-height:1}.subtitle{color:var(--text-muted);max-width:38rem;font-size:1.25rem;line-height:1.6}.body-layout{flex-direction:column;align-items:flex-start;gap:2rem;display:flex}.sidebar{flex-shrink:0;width:100%}.sidebar-label{letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted);margin-bottom:1rem;padding-left:.25rem;font-size:.75rem;font-weight:800}.cat-nav{flex-wrap:wrap;gap:.5rem;display:flex}.cat-btn{border:1px solid var(--border);color:var(--text-muted);cursor:pointer;background:#fff;border-radius:.75rem;padding:.75rem 1.25rem;font-size:.9rem;font-weight:600;transition:all .2s cubic-bezier(.4,0,.2,1);box-shadow:0 1px 2px #00000008}.cat-btn:hover{border-color:var(--primary);color:var(--primary)}.cat-btn.active{background:var(--primary);border-color:var(--primary);color:#fff;box-shadow:0 4px 12px #4f46e533}.list-panel{flex:1;width:100%}.search-box{border:1px solid var(--border);background:#fff;border-radius:1rem;align-items:center;gap:.75rem;padding:.25rem 1rem;transition:border-color .2s,box-shadow .2s;display:flex;box-shadow:0 2px 4px #00000005}.search-box:focus-within{border-color:var(--primary);box-shadow:0 0 0 3px #4f46e51a}.search-input{color:var(--text);background:0 0;border:none;outline:none;flex:1;padding:.85rem 0;font-size:1rem}.search-icon{width:1.25rem;height:1.25rem;color:var(--text-muted);flex-shrink:0}.list-body{grid-template-columns:1fr;gap:1.5rem;display:grid}.practical-card{border:1px solid var(--border);background:#fff;border-radius:1.5rem;text-decoration:none;transition:all .3s cubic-bezier(.4,0,.2,1);display:flex;position:relative;overflow:hidden;box-shadow:0 1px 3px #0000000d}.practical-card:hover{border-color:var(--primary);transform:translateY(-4px);box-shadow:0 12px 24px #00000014}.practical-card.completed{border-left:4px solid #10b981}.card-thumb{border-right:1px solid var(--border);background:#f1f5f9;flex-shrink:0;width:200px;height:150px;position:relative}.card-img{object-fit:cover;width:100%;height:100%}.card-placeholder{background:#f8fafc;justify-content:center;align-items:center;width:100%;height:100%;display:flex}.phi-icon{color:var(--border);font-size:2.5rem;font-weight:700}.difficulty-badge{text-transform:uppercase;background:#fff;border-radius:.75rem;padding:.35rem .75rem;font-size:.7rem;font-weight:800;position:absolute;top:.75rem;left:.75rem;box-shadow:0 2px 8px #0000001a}.difficulty-badge[data-level=Easy]{color:#059669}.difficulty-badge[data-level=Medium]{color:#d97706}.difficulty-badge[data-level=Hard]{color:#dc2626}.card-content{flex-direction:column;flex:1;justify-content:center;min-width:0;padding:1.5rem 2rem;display:flex}.card-header{align-items:center;gap:.75rem;margin-bottom:.75rem;display:flex}.p-number{color:var(--primary);background:var(--primary-glow);border-radius:.5rem;padding:.2rem .6rem;font-size:.8rem;font-weight:800}.p-category{color:var(--text-muted);font-size:.8rem;font-weight:600}.status-badge{color:#fff;background:#10b981;border-radius:9999px;margin-left:auto;padding:.25rem .75rem;font-size:.7rem;font-weight:800;box-shadow:0 2px 6px #10b98133}.p-title{color:var(--text);margin-bottom:1.25rem;font-size:1.35rem;font-weight:700;line-height:1.3}.card-footer{gap:2rem;display:flex}.meta-item{color:var(--text-muted);align-items:center;gap:.5rem;font-size:.85rem;font-weight:600;display:flex}.card-action{align-items:center;padding-right:2rem;display:flex}.item-arrow{width:1.5rem;height:1.5rem;color:var(--border);transition:all .3s}.practical-card:hover .item-arrow{color:var(--primary);transform:translate(6px)}.medium-selector-card{border:1px solid var(--border);background:#fff;border-radius:1.5rem;margin-bottom:2rem;padding:1.5rem;box-shadow:0 1px 2px #00000008}.medium-toggle{background:#f1f5f9;border-radius:1rem;grid-template-columns:1fr 1fr;gap:.5rem;margin-top:.75rem;padding:.3rem;display:grid}.medium-btn{color:var(--text-muted);cursor:pointer;background:0 0;border:none;border-radius:.75rem;padding:.75rem;font-weight:700;transition:all .2s}.medium-btn.active{color:var(--primary);background:#fff;box-shadow:0 2px 8px #0000000f}.skeleton-card{border:1px solid var(--border);background:#fff;border-radius:1.5rem;height:150px;display:flex;overflow:hidden;box-shadow:0 1px 2px #00000005}.skeleton-thumb{background:linear-gradient(90deg,#f1f5f9 25%,#e2e8f0 50%,#f1f5f9 75%) 0 0/200% 100%;width:200px;height:100%;animation:1.5s infinite shimmer}.skeleton-content{flex-direction:column;flex:1;justify-content:center;gap:1.25rem;padding:1.5rem 2rem;display:flex}.skeleton-header{gap:1rem;display:flex}.skeleton-badge{background:#f1f5f9;border-radius:6px;width:40px;height:16px}.skeleton-badge.wide{width:100px}.skeleton-title{background:#f1f5f9;border-radius:6px;width:60%;height:28px}.skeleton-footer{gap:2rem;display:flex}.skeleton-meta{background:#f1f5f9;border-radius:6px;width:80px;height:14px}@keyframes shimmer{0%{background-position:-200% 0}to{background-position:200% 0}}.hero-section{border:1px solid var(--border);text-align:center;background:#fff;border-radius:2.5rem;padding:4rem;box-shadow:0 4px 20px #00000008}.hero-top{justify-content:center;align-items:center;gap:1.5rem;margin-bottom:2rem;display:flex}.hero-title{color:var(--text);margin-bottom:2.5rem;font-size:clamp(2.5rem,5vw,4rem);font-weight:800;line-height:1.1}.hero-meta{justify-content:center;gap:4rem;display:flex}.meta-box{flex-direction:column;gap:.5rem;display:flex}.meta-label{text-transform:uppercase;color:var(--text-muted);letter-spacing:.1em;font-size:.8rem;font-weight:800}.meta-value{font-size:1.25rem;font-weight:700}.section-card{border:1px solid var(--border);background:#fff;border-radius:2.5rem;padding:3.5rem;box-shadow:0 1px 3px #00000005}.section-title{color:var(--text);align-items:center;gap:1rem;margin-bottom:2.5rem;font-size:1.75rem;font-weight:800;display:flex}.title-marker{border-radius:4px;width:8px;height:32px}.prose-content{color:#334155;font-size:1.15rem;line-height:1.8}.prose-content p{margin-bottom:1.5rem}.prose-content li{margin-bottom:.75rem}.prose-content img{border:1px solid var(--border);border-radius:1rem;max-width:100%;margin:2rem 0;display:block}.prose-content img[alt*=thin],.prose-content img.thin{float:right;width:40%;max-width:380px;margin:.5rem 0 1.5rem 2.5rem;display:inline-block}.prose-content:after{content:"";clear:both;display:table}.prose-content code{color:var(--primary);background:#f1f5f9;border-radius:.4rem;padding:.2rem .4rem;font-size:.9em}.important-item{background:#fff1f2;border:1px solid #fecdd3;border-radius:2rem;gap:2rem;padding:2rem;display:flex}.point-indicator{color:#fff;background:#f43f5e;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:2.5rem;height:2.5rem;font-weight:800;display:flex;box-shadow:0 4px 10px #f43f5e33}.apparatus-text{border:1px solid var(--border);color:#475569;background:#f8fafc;border-radius:2rem;padding:2rem 2.5rem;font-weight:600}.diagram-card{border:1px solid var(--border);border-radius:2.5rem;box-shadow:0 10px 30px #0000000d}.complete-btn{color:var(--text);border:1px solid var(--border);cursor:pointer;background:#f1f5f9;border-radius:9999px;padding:.75rem 1.5rem;font-weight:700;transition:all .2s}.complete-btn:hover{background:#fff;transform:translateY(-2px);box-shadow:0 4px 12px #0000000d}.complete-btn.active{color:#fff;background:#10b981;border-color:#10b981;box-shadow:0 4px 12px #10b9814d}.nav-current{color:var(--primary);font-weight:800}.nav-link{color:var(--text-muted)}.nav-link:hover{color:var(--primary)}@media (min-width:1024px){.body-layout{flex-direction:row;gap:4rem}.sidebar{width:22rem;position:sticky;top:7rem}.cat-nav{flex-direction:column;gap:.5rem}}@media (max-width:640px){.practical-card{flex-direction:column}.card-thumb{border-right:none;border-bottom:1px solid var(--border);width:100%;height:200px}.skeleton-card{flex-direction:column;height:auto}.skeleton-thumb{width:100%;height:200px}.hero-section{padding:2rem}.hero-meta{flex-direction:column;align-items:center;gap:1.5rem}.section-card{padding:2rem}}.animate-fade{animation:.8s cubic-bezier(.4,0,.2,1) forwards fadeIn}.animate-up{animation:.6s cubic-bezier(.4,0,.2,1) forwards fadeUp}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes fadeUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}.error-page{background:var(--bg-dark);justify-content:center;align-items:center;min-height:80vh;padding:2rem;display:flex}.error-card{text-align:center;border:1px solid var(--border);background:#fff;border-radius:2rem;flex-direction:column;align-items:center;gap:1.5rem;max-width:400px;padding:4rem 2rem;display:flex;box-shadow:0 4px 20px #0000000d}.error-card svg{color:var(--text-muted);opacity:.3}.error-card h1{color:var(--text);font-size:1.5rem;font-weight:800}.error-card p{color:var(--text-muted);line-height:1.6}.error-back-btn{background:var(--primary);color:#fff;border-radius:1rem;padding:.75rem 2.5rem;font-weight:800;text-decoration:none;transition:all .2s;box-shadow:0 4px 12px #4f46e533}.error-back-btn:hover{transform:translateY(-2px);box-shadow:0 6px 15px #4f46e54d}.question-card{border:1px solid var(--border);background:#fff;border-radius:2rem;margin-bottom:2rem;padding:2.5rem;box-shadow:0 1px 3px #00000005}.q-header h3{color:var(--text);margin:0;font-size:1.5rem;font-weight:800}.q-tag{color:var(--primary);border:1px solid var(--primary);letter-spacing:.05em;border-radius:.5rem;padding:.35rem .75rem;font-size:.75rem;font-weight:700}.sq-card{border:1px solid var(--border);background:#f8fafc;border-radius:1.5rem;padding:1.5rem;transition:border-color .2s}.sq-card:focus-within{border-color:var(--primary)}.q-part-label{color:var(--text);min-width:40px;font-size:1.1rem;font-weight:800}.answer-textarea{border:1px solid var(--border);width:100%;color:var(--text);resize:vertical;background:#fff;border-radius:1rem;outline:none;min-height:100px;margin-top:1rem;padding:1rem;font-family:inherit;font-size:1rem;transition:all .2s}.answer-textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px #4f46e51a}.official-answer-box{background:#f0fdf4;border-left:4px solid #22c55e;border-radius:1rem;margin-top:1.5rem;padding:1.5rem}.answer-label{color:#166534;text-transform:uppercase;letter-spacing:.1em;margin-bottom:.75rem;font-size:.75rem;font-weight:800;display:block}