:root{--saffron:#f59e0b;--saffron-d:#d97706;--saffron-l:#fef3c7;--teal:#0d9488;--teal-d:#0f766e;--teal-l:#ccfbf1;--indigo:#4f46e5;--indigo-l:#eef2ff;--crimson:#dc2626;--green:#16a34a;--green-l:#dcfce7;--cream:#fffbf0;--surface:#fff;--surface-2:#fafaf5;--border:#e8e0d0;--border-2:#d4c9b0;--ink:#1c1917;--ink-2:#57534e;--ink-3:#a8a29e;--grad-hero:linear-gradient(135deg,#1e1b4b 0%,#0f766e 50%,#d97706 100%);--grad-card:    linear-gradient(135deg, #f59e0b22, #0d948822);--grad-saffron:linear-gradient(135deg,#f59e0b,#ef4444);--grad-teal:linear-gradient(135deg,#0d9488,#4f46e5);--grad-premium:linear-gradient(135deg,#7c3aed,#dc2626);--glass:rgba(255,255,255,.72);--r-sm:8px;--r-md:14px;--r-lg:20px;--r-xl:28px;--r-pill:100px;--shadow-sm:0 2px 8px rgba(28,25,23,.08);--shadow:0 4px 20px rgba(28,25,23,.12);--shadow-lg:0 12px 40px rgba(28,25,23,.16);--shadow-glow:0 0 0 3px rgba(245,158,11,.25);--font-head:'Nunito' , 'Segoe UI' , sans-serif;--font-body:'Inter' , 'Segoe UI' , sans-serif;--ease:.2s 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var(--ease);transform-origin:left}.sub-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:var(--teal);color:var(--teal-d)}.sub-card:hover::after{transform:scaleX(1)}.sub-icon{font-size:38px;line-height:1}.sub-name{font-family:var(--font-head);font-size:15px;font-weight:800;color:var(--ink);line-height:1.3}.sub-count{font-size:12px;color:var(--ink-3)}.mcq-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:24px;margin-bottom:20px;box-shadow:var(--shadow-sm);position:relative;overflow:hidden;transition:box-shadow var(--ease)}.mcq-card::before{content:'';position:absolute;top:0;left:0;width:5px;height:100%;background:var(--grad-teal)}.mcq-card:hover{box-shadow:var(--shadow)}.mcq-header{display:flex;align-items:flex-start;gap:12px;margin-bottom:18px}.mcq-num{display:inline-flex;align-items:center;justify-content:center;min-width:32px;height:32px;border-radius:50%;background:var(--teal-l);color:var(--teal);font-size:13px;font-weight:900;flex-shrink:0}.mcq-q{font-size:16px;font-weight:700;color:var(--ink);line-height:1.6}.mcq-options{display:flex;flex-direction:column;gap:10px}.mcq-opt{display:flex;align-items:flex-start;gap:12px;padding:13px 16px;border-radius:var(--r-md);border:2px solid var(--border);cursor:pointer;transition:all var(--ease);font-size:14.5px;color:var(--ink-2);background:var(--surface-2);font-weight:500;user-select:none}.mcq-opt:hover{border-color:var(--teal);background:var(--teal-l);color:var(--teal-d)}.mcq-opt.selected{border-color:var(--indigo);background:var(--indigo-l);color:var(--indigo);font-weight:700}.mcq-opt.correct{border-color:var(--green);background:var(--green-l);color:var(--green);font-weight:700}.mcq-opt.wrong{border-color:var(--crimson);background:#fee2e2;color:var(--crimson);font-weight:700}.mcq-opt-key{min-width:26px;height:26px;border-radius:6px;background:var(--border);display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:800;flex-shrink:0;transition:all var(--ease)}.mcq-opt.correct .mcq-opt-key{background:var(--green);color:#fff}.mcq-opt.wrong .mcq-opt-key{background:var(--crimson);color:#fff}.mcq-opt.selected .mcq-opt-key{background:var(--indigo);color:#fff}.mcq-explain{margin-top:14px;padding:14px 16px;background:var(--saffron-l);border-radius:var(--r-sm);border-left:4px solid var(--saffron);font-size:13.5px;color:#78350f;display:none;line-height:1.65;animation:fadeIn .3s ease}.mcq-explain.show{display:block}@keyframes fadeIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}.quiz-controls{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:20px;background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);margin-bottom:24px;flex-wrap:wrap;box-shadow:var(--shadow-sm)}.quiz-timer{font-family:var(--font-head);font-size:22px;font-weight:900;color:var(--teal);display:flex;align-items:center;gap:6px}.quiz-timer.warning{color:var(--crimson);animation:pulse 1s ease infinite}@keyframes pulse{0%,100%{opacity:1}50%{opacity:.6}}.quiz-progress{flex:1;height:8px;background:var(--border);border-radius:var(--r-pill);overflow:hidden;min-width:120px}.quiz-progress-fill{height:100%;background:var(--grad-teal);border-radius:var(--r-pill);transition:width .5s ease}.quiz-result-panel{background:var(--surface);border:2px solid var(--teal);border-radius:var(--r-xl);padding:40px;text-align:center;box-shadow:var(--shadow-lg);display:none}.quiz-result-panel.show{display:block;animation:fadeIn .4s ease}.qr-score{font-family:var(--font-head);font-size:72px;font-weight:900;background:var(--grad-teal);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1;margin-bottom:6px}.qr-label{font-size:15px;color:var(--ink-2);margin-bottom:24px}.qr-bars{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;margin-bottom:28px}.qr-bar{text-align:center;padding:16px 24px;border-radius:var(--r-md);flex:1;min-width:80px}.qr-bar.correct{background:var(--green-l);color:var(--green)}.qr-bar.wrong{background:#fee2e2;color:var(--crimson)}.qr-bar.skip{background:var(--saffron-l);color:var(--saffron-d)}.qr-bar strong{display:block;font-size:32px;font-weight:900;font-family:var(--font-head)}.qr-bar span{font-size:12px;font-weight:600}.paper-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow-sm);display:flex;transition:all .25s ease;text-decoration:none;color:inherit;margin-bottom:14px}.paper-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-3px);border-color:rgba(245,158,11,.4);color:inherit}.paper-strip{width:5px;background:var(--grad-saffron);flex-shrink:0}.paper-strip.teal{background:var(--grad-teal)}.paper-strip.premium{background:var(--grad-premium)}.paper-body{padding:18px 20px;flex:1;min-width:0}.paper-title{font-family:var(--font-head);font-size:16px;font-weight:800;color:var(--ink);margin-bottom:8px;line-height:1.35}.paper-metas{display:flex;gap:7px;flex-wrap:wrap;margin-bottom:10px}.mtag{font-size:11.5px;font-weight:700;padding:3px 10px;border-radius:var(--r-pill);background:var(--saffron-l);color:var(--saffron-d)}.mtag-teal{background:var(--teal-l);color:var(--teal-d)}.mtag-premium{background:#f5f3ff;color:#7c3aed;border:1px solid #ddd6fe}.mtag-free{background:var(--green-l);color:var(--green)}.paper-desc{font-size:13.5px;color:var(--ink-2);line-height:1.6;margin-bottom:12px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.paper-footer{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px}.lock-badge{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:700;color:#7c3aed;background:#f5f3ff;padding:5px 12px;border-radius:var(--r-pill);border:1px solid #ddd6fe}.pdf-wrapper{background:#0f172a;border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--shadow-lg);margin:24px 0}.pdf-toolbar{background:#1e293b;padding:12px 18px;display:flex;align-items:center;gap:10px;flex-wrap:wrap}.pdf-title{color:#94a3b8;font-size:13px;font-weight:600;flex:1;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.pdf-btn{background:rgba(255,255,255,.12);border:none;color:#e2e8f0;padding:7px 16px;border-radius:8px;font-size:13px;cursor:pointer;transition:background var(--ease);font-weight:600;font-family:var(--font-body)}.pdf-btn:hover{background:rgba(255,255,255,.25)}.pdf-frame{width:100%;height:72vh;border:none;display:block;background:#fff}.pdf-premium-gate{position:relative;overflow:hidden}.pdf-premium-gate .pdf-frame{filter:blur(4px);pointer-events:none;max-height:380px}.pdf-gate-overlay{position:absolute;inset:0;background:linear-gradient(transparent 20%,#0f172a 55%);display:flex;flex-direction:column;align-items:center;justify-content:flex-end;padding:36px 24px 32px;text-align:center}.pdf-gate-overlay h3{color:#fff;font-family:var(--font-head);font-size:22px;margin-bottom:8px}.pdf-gate-overlay p{color:rgba(255,255,255,.72);font-size:14px;margin-bottom:20px;line-height:1.6}.pdf-gate-price{font-family:var(--font-head);font-size:36px;font-weight:900;color:#fbbf24;margin-bottom:6px}.pdf-gate-orig{font-size:14px;color:rgba(255,255,255,.4);text-decoration:line-through;margin-bottom:20px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;padding:11px 24px;border-radius:var(--r-md);font-size:14.5px;font-weight:700;border:none;cursor:pointer;transition:all var(--ease);white-space:nowrap;font-family:var(--font-body);text-decoration:none;letter-spacing:.01em}.btn-saffron{background:var(--grad-saffron);color:#fff;box-shadow:0 4px 15px rgba(245,158,11,.35)}.btn-saffron:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(245,158,11,.45);color:#fff}.btn-teal{background:var(--grad-teal);color:#fff;box-shadow:0 4px 15px rgba(13,148,136,.3)}.btn-teal:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(13,148,136,.4);color:#fff}.btn-premium{background:var(--grad-premium);color:#fff;box-shadow:0 4px 15px rgba(124,58,237,.35)}.btn-premium:hover{transform:translateY(-2px);color:#fff}.btn-outline{background:transparent;border:2px solid var(--teal);color:var(--teal)}.btn-outline:hover{background:var(--teal-l)}.btn-ghost{background:transparent;border:1.5px solid var(--border);color:var(--ink-2)}.btn-ghost:hover{background:var(--surface-2);color:var(--ink)}.btn-sm{padding:7px 16px;font-size:13px}.btn-lg{padding:14px 30px;font-size:16px}.btn-full{width:100%}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none!important}.bc{display:flex;align-items:center;flex-wrap:wrap;gap:4px 6px;font-size:13px;color:var(--ink-3);margin-bottom:22px}.bc a{color:var(--ink-3);font-weight:500;transition:color var(--ease)}.bc a:hover{color:var(--teal)}.bc-sep{font-size:14px;color:var(--ink-3)}.bc span{font-weight:700;color:var(--ink-2)}.filter-bar{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:16px 0;border-bottom:2px solid var(--border);margin-bottom:24px}.filter-chip{padding:7px 16px;border-radius:var(--r-pill);font-size:13px;font-weight:600;border:1.5px solid var(--border);background:var(--surface);color:var(--ink-2);cursor:pointer;text-decoration:none;white-space:nowrap;transition:all var(--ease)}.filter-chip:hover{border-color:var(--teal);color:var(--teal)}.filter-chip.active{background:var(--teal);border-color:var(--teal);color:#fff;box-shadow:0 4px 12px rgba(13,148,136,.3)}.filter-select{border:1.5px solid var(--border);border-radius:var(--r-sm);padding:8px 12px;font-size:13.5px;color:var(--ink);background:var(--surface);outline:none;cursor:pointer;transition:border-color var(--ease);font-weight:500}.filter-select:focus{border-color:var(--teal)}.sec-hd{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px;padding-bottom:14px;border-bottom:2px solid var(--border)}.sec-hd h2{font-size:1.4rem;font-weight:900}.sec-hd a{font-size:13.5px;font-weight:700;color:var(--teal);padding:6px 16px;border:1.5px solid var(--teal);border-radius:var(--r-pill);transition:all var(--ease)}.sec-hd a:hover{background:var(--teal);color:#fff}.pgn{display:flex;align-items:center;justify-content:center;gap:6px;margin-top:36px;flex-wrap:wrap}.pgn a,.pgn span{min-width:40px;height:40px;display:flex;align-items:center;justify-content:center;border-radius:var(--r-sm);font-size:14px;font-weight:700;color:var(--ink-2);background:var(--surface);border:1.5px solid var(--border);transition:all var(--ease)}.pgn a:hover,.pgn .current{background:var(--teal);color:#fff;border-color:var(--teal);box-shadow:0 4px 12px rgba(13,148,136,.3)}.sw-box{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-lg);padding:22px;margin-bottom:20px;box-shadow:var(--shadow-sm)}.sw-box h3{font-family:var(--font-head);font-size:13px;font-weight:800;color:var(--ink);margin-bottom:14px;padding-bottom:10px;border-bottom:2px solid var(--border);text-transform:uppercase;letter-spacing:.5px}.sw-link{display:flex;align-items:center;justify-content:space-between;padding:9px 8px;border-radius:var(--r-sm);font-size:13.5px;font-weight:600;color:var(--ink-2);transition:all var(--ease);text-decoration:none}.sw-link:hover{background:var(--teal-l);color:var(--teal-d)}.sw-link .cnt{background:var(--border);padding:2px 8px;border-radius:var(--r-pill);font-size:11px;color:var(--ink-3)}.notice{padding:13px 18px;border-radius:var(--r-md);font-size:14px;margin-bottom:18px;display:flex;align-items:flex-start;gap:10px;font-weight:500;line-height:1.5}.notice-ok{background:var(--green-l);color:#166534;border:1px 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brightness(.45);transform:scale(1.05)}.ep-book-hero-overlay{position:absolute;inset:0;background:linear-gradient(135deg,rgba(30,27,75,.85),rgba(13,148,136,.7))}.ep-book-hero::after{content:'';position:absolute;bottom:-2px;left:0;right:0;height:60px;background:var(--cream);clip-path:ellipse(55% 100% at 50% 100%)}.ep-book-hero-inner{position:relative;z-index:2;display:flex;align-items:center;gap:48px}.ep-book-hero-cover-wrap{display:flex;flex-shrink:0;height:280px;filter:drop-shadow(-8px 12px 32px rgba(0,0,0,.45))}.ep-book-hero-spine{width:18px;background:linear-gradient(to right,rgba(0,0,0,.5),rgba(0,0,0,.1));border-radius:4px 0 0 4px;flex-shrink:0}.ep-book-hero-cover{width:190px;border-radius:0 8px 8px 0;overflow:hidden;background:#374151}.ep-book-hero-cover img{width:100%;height:100%;object-fit:cover;display:block}.ep-book-hero-pages{width:12px;background:repeating-linear-gradient(to bottom,#fff 0,#eee 1px,#fff 2px);border-radius:0 3px 3px 0;box-shadow:3px 0 6px 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img{border-radius:50%;flex-shrink:0}.comment-list .comment-meta{font-size:12.5px;color:var(--ink-3);margin-bottom:8px}.comment-list .comment-author{font-weight:700;color:var(--ink);font-size:14px}.comment-list .comment-content p{font-size:14.5px;color:var(--ink-2);line-height:1.7;margin:0}.comment-respond{margin-top:24px}.comment-respond h3{font-size:1.1rem;margin-bottom:16px;font-weight:800}.comment-form label{display:block;font-size:12.5px;font-weight:700;color:var(--ink);margin-bottom:5px;text-transform:uppercase;letter-spacing:.4px}.comment-form input[type="text"],.comment-form input[type="email"],.comment-form textarea{width:100%;padding:11px 14px;border:1.5px solid var(--border);border-radius:var(--r-md);font-size:14px;font-family: var(--font-body);margin-bottom:14px;outline:none;transition:border-color var(--ease);background:var(--surface);color:var(--ink)}.comment-form input:focus,.comment-form textarea:focus{border-color:var(--teal);box-shadow:0 0 0 3px 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p{font-size:13px;color:var(--ink-2);margin-bottom:10px;font-weight:600}.ep-star-interactive{display:flex;gap:6px;justify-content:center;margin-bottom:8px}.ep-star-btn{background:none;border:none;cursor:pointer;color:#e5e7eb;padding:2px;transition:color .15s ease , transform .15s ease;line-height:0}.ep-star-btn:hover,.ep-star-btn.ep-star-active{color:#f59e0b;transform:scale(1.15)}.ep-rel-book-item{display:flex;gap:12px;padding:10px 0;border-bottom:1px solid var(--border);text-decoration:none;color:inherit;transition:background var(--ease);align-items:flex-start}.ep-rel-book-item:last-child{border-bottom:none}.ep-rel-book-item:hover{color:var(--teal-d)}.ep-rel-book-thumb{width:44px;height:60px;border-radius:4px;overflow:hidden;flex-shrink:0;background:var(--teal-l)}.ep-rel-book-thumb img{width:100%;height:100%;object-fit:cover;display:block}.ep-rel-book-info{min-width:0}.ep-rel-book-title{font-size:13px;font-weight:700;color:var(--ink);line-height:1.35;margin-bottom:4px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.ep-rel-book-author{font-size:11px;color:var(--ink-3);margin-bottom:5px}.ep-rel-book-price{font-size:11.5px;font-weight:700;padding:2px 8px;border-radius:var(--r-pill);display:inline-flex;align-items:center;gap:3px}.ep-rel-free{background:var(--green-l);color:var(--green)}.ep-rel-paid{background:#f5f3ff;color:#7c3aed}@media (max-width:1100px){.ep-book-hero-inner{gap:32px}.ep-book-hero-cover-wrap{height:240px}.ep-book-hero-cover{width:160px}}@media (max-width:900px){.ep-book-single-layout{grid-template-columns:1fr}.ep-book-sidebar{order:-1;display:grid;grid-template-columns:1fr 1fr;gap:16px}.ep-book-sidebar-box{margin-bottom:0}}@media (max-width:768px){.ep-book-hero-inner{flex-direction:column;text-align:center;gap:24px}.ep-book-hero-cover-wrap{height:220px;margin:0 auto}.ep-book-hero-pills{justify-content:center}.ep-book-hero-cta{justify-content:center}.ep-book-hero-excerpt{margin:0 auto 24px}.ep-book-hero{padding:40px 0 60px}.ep-books-filters{flex-direction:column;align-items:flex-start}.ep-book-sidebar{grid-template-columns:1fr}}@media (max-width:480px){.ep-books-header{flex-direction:column}.ep-book-search-form .form-inp{min-width:0;width:100%}.ep-book-search-form{width:100%}.ep-book-hero-cover-wrap{height:180px}.ep-book-hero-cover{width:130px}}.mcq-hero-strip{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;background:var(--grad-hero);border-radius:var(--r-lg);padding:28px 28px 28px 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.mcq-cat-arr{transform:translateX(4px);color:var(--teal)}.mcq-topics-hero{background:var(--grad-hero);border-radius:var(--r-lg);padding:24px 24px 24px;margin-bottom:22px;display:flex;flex-direction:column;gap:14px;position:relative;overflow:hidden}.mcq-topics-hero::after{content:'';position:absolute;bottom:-20px;right:-20px;width:120px;height:120px;border-radius:50%;background:rgba(255,255,255,.07)}.mcq-back-btn{display:inline-flex;align-items:center;gap:6px;color:rgba(255,255,255,.75);font-size:13.5px;font-weight:600;text-decoration:none;transition:color var(--ease);width:fit-content}.mcq-back-btn:hover{color:#fbbf24}.mcq-topics-hero-body{display:flex;align-items:center;gap:18px}.mcq-topics-hero-icon{width:64px;height:64px;border-radius:16px;background:rgba(255,255,255,.15);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;color:#fbbf24;flex-shrink:0}.mcq-topics-hero-body 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