:root{color-scheme:dark;--bg-primary: #08080a;--bg-secondary: #101014;--panel-bg: #14141c;--border-color: rgba(255, 255, 255, .12);--text-primary: #ffffff;--text-secondary: #e4e4e7;--text-muted: #a1a1aa;--color-physics: #06b6d4;--color-chemistry: #10b981;--color-math: #8b5cf6;--color-biology: #f43f5e;--active-color: var(--color-physics);--active-color-rgb: 6, 182, 212;--radius-card: 18px;--radius-pill: 999px;--shadow-card: none;--transition-smooth: all .3s cubic-bezier(.4, 0, .2, 1)}[data-theme=light]{color-scheme:light;--bg-primary: #f1f5f9;--bg-secondary: #ffffff;--panel-bg: #ffffff;--border-color: #e2e8f0;--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #64748b}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}html{color-scheme:dark light;background-color:var(--bg-primary);scroll-behavior:smooth}body{background-color:var(--bg-primary);color:var(--text-primary);font-family:Outfit,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;min-height:100vh;margin:0;padding:0;display:flex;flex-direction:column;overflow-x:hidden;font-size:1rem;line-height:1.5}a{color:inherit;text-decoration:none}.res-ambient{position:fixed;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:0;background:radial-gradient(40% 30% at 15% 10%,rgba(6,182,212,.1),transparent 70%),radial-gradient(35% 30% at 85% 20%,rgba(139,92,246,.1),transparent 70%),radial-gradient(40% 40% at 50% 100%,rgba(16,185,129,.08),transparent 70%)}.res-header{position:relative;z-index:20;display:flex;align-items:center;justify-content:flex-end;gap:1rem;padding:.7rem 1rem;background:var(--bg-primary);border-bottom:1px solid var(--border-color)}.res-brand{position:absolute;left:50%;transform:translate(-50%);display:flex;text-decoration:none}.res-brand-main{display:flex;align-items:center;gap:.6rem}.res-logo{width:46px;height:46px;object-fit:contain;filter:drop-shadow(0 0 10px rgba(212,175,55,.4))}.res-brand-text{font-size:1.6rem;font-weight:800;letter-spacing:-.03em;background:linear-gradient(135deg,#ffe082,#d4af37,#b38f00);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:#d4af37}.res-brand-sub{font-size:.82rem;font-weight:700;letter-spacing:.16em;text-transform:uppercase;color:var(--text-muted);opacity:.85}[data-theme=light] .res-brand-text{background:linear-gradient(135deg,#b8860b,#8a6a14);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:#8a6a14}.res-header-spacer{flex:1}.res-header-controls{display:flex;align-items:center;gap:.75rem}.res-back-link{font-size:.92rem;font-weight:700;padding:.55rem 1.15rem;border-radius:var(--radius-pill);background:linear-gradient(135deg,#6366f1,#4f46e5);color:#fff;border:none;cursor:pointer;transition:var(--transition-smooth)}.res-back-link:hover{background:linear-gradient(135deg,#4f46e5,#4338ca);transform:translateY(-1px)}.btn-theme-toggle{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border-radius:12px;border:1px solid var(--border-color);background:var(--panel-bg);color:var(--text-secondary);cursor:pointer;transition:var(--transition-smooth)}.btn-theme-toggle:hover{color:var(--text-primary);border-color:var(--active-color)}.res-layout{position:relative;z-index:1;display:grid;grid-template-columns:220px 1fr;gap:2rem;max-width:1480px;width:100%;margin:0 auto;padding:1.5rem 1.5rem 3rem;flex:1}.res-rail{position:sticky;top:1rem;align-self:start;display:flex;flex-direction:column;gap:.5rem}.res-tab{display:flex;align-items:center;gap:.75rem;padding:.7rem .9rem;border-radius:14px;border:1px solid transparent;background:transparent;color:var(--text-muted);font-size:.95rem;font-weight:600;cursor:pointer;text-align:left;transition:var(--transition-smooth)}.res-tab:hover{color:var(--text-primary);background:color-mix(in srgb,var(--panel-bg) 60%,transparent)}.res-tab.active{color:var(--text-primary);background:var(--panel-bg);border-color:var(--border-color)}.res-tab-ico{width:20px;height:20px;flex:none;color:var(--text-muted);transition:var(--transition-smooth)}.res-tab:hover .res-tab-ico{color:var(--text-secondary)}.res-tab.active .res-tab-ico{color:var(--tab-accent, var(--active-color));filter:drop-shadow(0 0 8px var(--tab-accent, var(--active-color)))}.res-rail-divider{height:1px;background:var(--border-color);margin:.4rem .5rem}.res-main{min-width:0}.res-hero{margin-bottom:1.25rem}.res-hero h1{font-size:1.7rem;font-weight:800;letter-spacing:-.02em}.res-hero p{color:var(--text-muted);margin-top:.35rem;font-size:.98rem;display:none}.res-filters{display:flex;flex-wrap:wrap;gap:.6rem;align-items:center;margin-bottom:1.25rem}.res-search{flex:1;min-width:200px;padding:.6rem .9rem;border-radius:12px;border:1px solid color-mix(in srgb,#6366f1 35%,var(--border-color));background:var(--panel-bg);color:var(--text-primary);font-size:.95rem;font-family:inherit}.res-search:focus{outline:none;border-color:#6366f1;box-shadow:0 0 0 3px #6366f138}.res-select{appearance:none;-webkit-appearance:none;-moz-appearance:none;flex:1 1 160px;min-width:150px;padding:.6rem 2.3rem .6rem .9rem;border-radius:12px;border:1px solid color-mix(in srgb,#6366f1 35%,var(--border-color));background-color:var(--panel-bg);background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 24 24' fill='none' stroke='%23a1a1aa' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right .85rem center;color:var(--text-primary);font-size:.9rem;font-family:inherit;cursor:pointer;transition:var(--transition-smooth)}.res-select:focus{outline:none;border-color:#6366f1}.res-select:hover{border-color:#6366f1}.res-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:1.1rem}.res-card{background:var(--panel-bg);border:1px solid var(--border-color);border-radius:var(--radius-card);padding:.9rem;display:flex;flex-direction:column;gap:.7rem;cursor:pointer;transition:var(--transition-smooth);position:relative;overflow:hidden}.res-card:hover{transform:translateY(-4px);border-color:var(--active-color);box-shadow:var(--shadow-card)}.res-card-img{width:100%;aspect-ratio:3 / 4;object-fit:cover;border-radius:12px;background:linear-gradient(135deg,color-mix(in srgb,var(--active-color) 22%,#1a1a22),#20202c);border:1px solid var(--border-color)}.res-card-img-fallback{display:flex;align-items:center;justify-content:center;text-align:center;padding:1rem;color:var(--text-secondary);font-weight:700;font-size:.95rem}.res-card-badges{display:flex;flex-wrap:wrap;gap:.35rem;position:absolute;top:1.1rem;left:1.1rem}.res-badge{font-size:.7rem;font-weight:700;padding:.2rem .5rem;border-radius:8px;color:#06121a;background:var(--active-color);text-transform:uppercase;letter-spacing:.02em}.res-badge.free{background:#22c55e;color:#04140a}.res-card-title{font-size:.98rem;font-weight:700;line-height:1.3;color:var(--text-primary)}.res-card-meta{font-size:.8rem;color:var(--text-muted)}.res-card-price{margin-top:auto;display:flex;align-items:baseline;gap:.5rem}.res-price-now{font-family:JetBrains Mono,monospace;font-size:1.05rem;font-weight:700;color:var(--text-primary)}.res-price-mrp{font-family:JetBrains Mono,monospace;font-size:.8rem;color:var(--text-muted);text-decoration:line-through}.res-price-tag{font-size:.78rem;color:#34d399;font-weight:700}.res-price-tba{font-size:.82rem;color:var(--text-muted);font-weight:600}.res-free-list{display:flex;flex-direction:column;gap:.75rem}.res-free-row{display:flex;align-items:center;gap:1rem;padding:.9rem 1rem;border-radius:14px;border:1px solid var(--border-color);background:var(--panel-bg);cursor:pointer;transition:var(--transition-smooth)}.res-free-row:hover{border-color:var(--active-color);transform:translate(3px)}.res-free-ico{width:42px;height:42px;flex:none;border-radius:11px;display:grid;place-items:center;background:color-mix(in srgb,var(--active-color) 20%,transparent);color:var(--active-color);font-size:1.1rem}.res-free-title{font-weight:700;font-size:.98rem}.res-free-sub{font-size:.82rem;color:var(--text-muted)}.res-free-go{margin-left:auto;color:var(--active-color);font-weight:700;font-size:.85rem}.res-modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:50;background:#020206b8;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);display:none;align-items:flex-start;justify-content:center;padding:3vh 1rem;overflow-y:auto}.res-modal-overlay.active{display:flex}.res-modal{width:100%;max-width:880px;background:var(--panel-bg);border:1px solid var(--border-color);border-radius:22px;box-shadow:var(--shadow-card);overflow:hidden}.res-modal-top{display:flex;justify-content:space-between;align-items:center;padding:.9rem 1.1rem;border-bottom:1px solid var(--border-color)}.res-modal-store{display:flex;align-items:center;gap:.5rem;font-weight:700;font-size:.95rem}.res-modal-close{width:36px;height:36px;border-radius:10px;border:1px solid var(--border-color);background:transparent;color:var(--text-secondary);cursor:pointer;font-size:1rem}.res-modal-close:hover{color:var(--text-primary)}.res-modal-body{display:grid;grid-template-columns:320px 1fr;gap:1.4rem;padding:1.4rem}.res-modal-img{width:100%;aspect-ratio:3 / 4;object-fit:cover;border-radius:16px;border:1px solid var(--border-color);background:linear-gradient(135deg,color-mix(in srgb,var(--active-color) 20%,#1a1a22),#20202c)}.res-modal-img-fallback{display:grid;place-items:center;text-align:center;padding:1.5rem;color:var(--text-secondary);font-weight:700}.res-modal-info{display:flex;flex-direction:column;gap:.7rem;min-width:0}.res-modal-title{font-size:1.35rem;font-weight:800;line-height:1.25}.res-modal-author{color:var(--text-muted);font-size:.92rem}.res-modal-rating{display:flex;align-items:center;gap:.4rem;color:#fbbf24;font-size:.9rem}.res-modal-rating .count{color:var(--text-muted)}.res-modal-pricebox{display:flex;align-items:baseline;gap:.6rem;flex-wrap:wrap;padding:.6rem 0}.res-modal-price-now{font-family:JetBrains Mono,monospace;font-size:1.7rem;font-weight:800}.res-modal-price-mrp{font-family:JetBrains Mono,monospace;color:var(--text-muted);text-decoration:line-through;font-size:1rem}.res-modal-discount{color:#34d399;font-weight:800;font-size:.95rem}.res-modal-price-tba{font-size:.95rem;color:var(--text-muted);font-weight:600}.res-modal-desc{color:var(--text-secondary);font-size:.92rem;line-height:1.6}.res-modal-specs{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:.4rem 1.2rem;margin:.3rem 0}.res-modal-specs li{font-size:.85rem;color:var(--text-secondary);display:flex;justify-content:space-between;border-bottom:1px dashed var(--border-color);padding-bottom:.3rem}.res-modal-specs li b{color:var(--text-primary);font-weight:600}.res-buy-row{display:flex;gap:.7rem;margin-top:.5rem;flex-wrap:wrap}.res-btn-buy{flex:1;min-width:160px;padding:.85rem 1rem;border-radius:14px;border:none;background:var(--active-color);color:#04121a;font-weight:800;font-size:1rem;cursor:pointer;transition:var(--transition-smooth)}.res-btn-buy:hover{filter:brightness(1.07)}.res-btn-ghost{padding:.85rem 1rem;border-radius:14px;border:1px solid var(--border-color);background:transparent;color:var(--text-primary);font-weight:700;cursor:pointer;transition:var(--transition-smooth)}.res-btn-ghost:hover{border-color:var(--active-color)}.res-footer{position:relative;z-index:1;text-align:center;padding:1.4rem 1rem 2rem;font-size:.72rem;color:var(--text-muted);opacity:.7;line-height:1.6;border-top:1px solid var(--border-color)}.res-footer a{color:var(--text-muted);text-decoration:underline}.res-footer .copy{margin-top:.3rem}.res-empty{text-align:center;color:var(--text-muted);padding:3rem 1rem;font-size:.95rem}.res-btn-read{flex:1;min-width:160px;display:flex;align-items:center;justify-content:center;gap:.5rem;padding:.85rem 1rem;border-radius:14px;border:none;text-decoration:none;background:linear-gradient(135deg,#6366f1,#4f46e5);color:#fff;font-weight:800;font-size:1rem;cursor:pointer;transition:var(--transition-smooth)}.res-btn-read:hover{background:linear-gradient(135deg,#4f46e5,#4338ca);transform:translateY(-2px)}.res-btn-read.res-btn-disabled{background:var(--panel-bg);color:var(--text-muted);border:1px solid var(--border-color);box-shadow:none;cursor:default;transform:none}.res-free-tag{font-size:.82rem;font-weight:800;color:#34d399!important;letter-spacing:.02em}.res-msg-wrap{display:flex;justify-content:center;padding:3rem 1rem}.res-msg{max-width:620px;text-align:center;background:var(--panel-bg);border:1px solid var(--border-color);border-radius:22px;padding:2.2rem 2rem;box-shadow:var(--shadow-card)}.res-msg-title{font-size:1.25rem;font-weight:800;line-height:1.4;color:var(--text-primary)}.res-msg-emoji{font-size:2rem;margin-bottom:.7rem}.res-gold{font-weight:800;background:linear-gradient(135deg,#ffe082,#d4af37,#b38f00);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:#d4af37}[data-theme=light] .res-gold{background:linear-gradient(135deg,#b8860b,#8a6a14);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:#8a6a14}.res-msg-sub{margin-top:.9rem;font-size:.98rem;color:var(--text-muted);line-height:1.6}@media(max-width:1024px){.res-layout{grid-template-columns:1fr;padding:1rem .9rem 2.5rem;gap:1rem}.res-rail{position:static;flex-direction:row;flex-wrap:nowrap;justify-content:flex-start;gap:.5rem;overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none}.res-rail::-webkit-scrollbar{display:none}.res-rail-divider{display:none}.res-tab{white-space:nowrap;flex:0 0 auto;justify-content:center;padding:.55rem .9rem}.res-hero{text-align:center;margin-bottom:.9rem}.res-hero h1{font-size:1.4rem}.res-hero p{font-size:.88rem}.res-header{flex-direction:column;align-items:center;justify-content:center;gap:.6rem;position:static;padding:.85rem 1rem .5rem}.res-brand{position:static;transform:none}.res-header-controls{width:100%;justify-content:flex-end}.res-back-link{order:2}.btn-theme-toggle{order:1}.res-hero{display:none}.res-filters{gap:.5rem}.res-search{flex:1 1 100%;min-width:0}#resSubjectFilters,#resClassFilters{flex:1 1 0;min-width:0}.res-select{flex:1 1 100%;width:100%}.res-grid{grid-template-columns:repeat(3,1fr);gap:.55rem}.res-card{padding:.5rem;gap:.5rem}.res-card-img{border-radius:10px}.res-card-title{font-size:.78rem}.res-card-meta{font-size:.7rem}.res-badge{font-size:.6rem;padding:.15rem .4rem}.res-modal-body{grid-template-columns:1fr}.res-modal-img{max-width:240px;margin:0 auto}}