:root{--emerald:#059669;--emerald-light:#10b981;--emerald-dark:#047857;--emerald-subtle:#ecfdf5;--emerald-border:#10b98159;--emerald-glow:#10b98140;--orange:#ea580c;--orange-light:#f97316;--orange-dark:#c2410c;--orange-subtle:#fff7ed;--orange-border:#f9731659;--orange-glow:#f9731640;--text-heading:#0f172a;--text-body:#334155;--text-muted:#64748b;--text-light:#94a3b8;--bg-canvas:#f8fafc;--card-bg:#ffffffeb;--card-border:#e2e8f0f2;--card-shadow:0 4px 20px -2px #0f172a0a, 0 2px 6px -1px #0f172a05;--card-shadow-hover:0 22px 35px -8px #05966924, 0 12px 20px -6px #ea580c1a;--radius-sm:8px;--radius-md:14px;--radius-lg:20px;--radius-full:9999px}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-canvas);color:var(--text-body);-webkit-font-smoothing:antialiased;background-image:radial-gradient(at 0 0,#10b98112 0,#0000 50%),radial-gradient(at 100% 0,#f9731614 0,#0000 50%),radial-gradient(at 50% 100%,#10b9810d 0,#0000 50%);background-attachment:fixed;min-height:100vh;font-family:Plus Jakarta Sans,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;overflow-x:hidden}.gallery-container{max-width:1320px;margin:0 auto;padding:1.5rem 1.75rem 5rem}.beamer-topbar{border-radius:var(--radius-lg);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);background:#ffffffd9;border:1px solid #e2e8f0e6;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:14px;margin-bottom:2.2rem;padding:12px 24px;display:flex;box-shadow:0 4px 20px -4px #0000000a}.beamer-brand{align-items:center;gap:12px;display:flex}.brand-icon{filter:drop-shadow(0 2px 4px #f973164d);font-size:1.6rem}.brand-name{letter-spacing:-.02em;background:linear-gradient(135deg, var(--emerald-dark) 0%, var(--emerald) 40%, var(--orange) 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text;font-size:1.1rem;font-weight:800;display:block}.brand-sub{letter-spacing:.12em;color:var(--text-muted);font-size:.68rem;font-weight:700;display:block}.beamer-nav-links{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.beamer-nav-btn{color:var(--text-body);border-radius:var(--radius-md);background:#fffc;border:1px solid #e2e8f0e6;align-items:center;gap:6px;padding:8px 15px;font-size:.82rem;font-weight:600;text-decoration:none;transition:all .25s cubic-bezier(.16,1,.3,1);display:inline-flex}.beamer-nav-btn:hover{background:var(--emerald-subtle);border-color:var(--emerald-border);color:var(--emerald-dark);transform:translateY(-2px);box-shadow:0 4px 12px #10b98126}.beamer-nav-btn.primary{background:linear-gradient(135deg, var(--emerald-subtle), var(--orange-subtle));border-color:var(--emerald-border);color:var(--emerald-dark)}.gallery-header{text-align:center;margin-bottom:2.5rem;padding:1rem 0}.eyebrow{color:var(--emerald-dark);background:var(--emerald-subtle);border:1px solid var(--emerald-border);border-radius:var(--radius-full);letter-spacing:.08em;text-transform:uppercase;align-items:center;gap:6px;margin-bottom:1.25rem;padding:6px 14px;font-size:.76rem;font-weight:800;display:inline-flex;box-shadow:0 2px 8px #10b9811a}.eyebrow-icon{color:var(--orange)}.hero-title{letter-spacing:-.03em;color:var(--text-heading);margin-bottom:1.1rem;font-size:clamp(2.1rem,4.5vw,3.4rem);font-weight:800;line-height:1.18}.gradient-orange{background:linear-gradient(135deg, var(--orange) 0%, #f59e0b 100%);-webkit-text-fill-color:transparent;-webkit-background-clip:text}.hero-desc{color:var(--text-muted);max-width:780px;margin:0 auto 1.5rem;font-size:1.05rem;line-height:1.65}.hero-stats-strip{border-radius:var(--radius-full);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#ffffffd9;border:1px solid #e2e8f0f2;flex-wrap:wrap;justify-content:center;align-items:center;gap:12px;padding:8px 20px;display:inline-flex;box-shadow:0 4px 16px #00000008}.stat-badge{color:var(--text-body);font-size:.84rem;font-weight:600}.stat-badge.emerald{color:var(--emerald-dark)}.stat-badge.orange{color:var(--orange-dark)}.stat-num{margin-right:3px;font-size:.95rem;font-weight:800}.stat-dot{color:var(--text-light);font-size:.8rem}.recent-section{border-radius:var(--radius-md);background:linear-gradient(135deg,#ecfdf5cc 0%,#fff7edcc 100%);border:1px solid #10b98140;flex-wrap:wrap;align-items:center;gap:14px;margin-bottom:2rem;padding:12px 18px;display:flex;box-shadow:0 4px 12px #10b9810f}.recent-header{color:var(--text-heading);white-space:nowrap;align-items:center;gap:6px;font-size:.84rem;font-weight:700;display:flex}.recent-icon{color:var(--emerald)}.recent-chips{flex-wrap:wrap;flex:1;align-items:center;gap:10px;display:flex}.recent-chip{border-radius:var(--radius-full);color:var(--text-heading);cursor:pointer;background:#fff;border:1px solid #e2e8f0e6;align-items:center;gap:8px;padding:6px 12px;font-size:.8rem;font-weight:600;transition:all .2s;display:inline-flex;box-shadow:0 2px 6px #00000008}.recent-chip:hover{border-color:var(--orange-light);color:var(--orange-dark);transform:translateY(-1px);box-shadow:0 4px 12px #f9731626}.chip-badge{border-radius:var(--radius-sm);padding:2px 6px;font-size:.68rem;font-weight:800}.chip-exam .chip-badge{background:var(--orange-subtle);color:var(--orange-dark)}.chip-lesson .chip-badge{background:var(--emerald-subtle);color:var(--emerald-dark)}.chip-title{text-overflow:ellipsis;white-space:nowrap;max-width:260px;overflow:hidden}.library-tools{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:1.25rem;margin-bottom:1.25rem;display:flex}.tabs-container{border:1px solid var(--card-border);border-radius:var(--radius-full);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#ffffffd9;align-items:center;gap:8px;padding:6px;display:flex;box-shadow:0 4px 14px #00000008}.tab-btn{color:var(--text-muted);border-radius:var(--radius-full);cursor:pointer;background:0 0;border:1px solid #0000;align-items:center;gap:8px;padding:8px 18px;font-size:.94rem;font-weight:700;transition:all .25s cubic-bezier(.16,1,.3,1);display:inline-flex}.tab-btn:hover{color:var(--text-heading)}.tab-btn.active{background:linear-gradient(135deg, var(--emerald-subtle) 0%, var(--orange-subtle) 100%);border-color:var(--emerald-border);color:var(--emerald-dark);box-shadow:0 4px 16px #10b98126}.tab-count{border-radius:var(--radius-full);color:var(--emerald-dark);background:#ffffffe6;border:1px solid #10b98140;justify-content:center;align-items:center;padding:2px 7px;font-size:.72rem;font-weight:800;display:inline-flex}.search-box{border:1px solid var(--card-border);border-radius:var(--radius-full);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#ffffffe6;flex:1;align-items:center;gap:8px;max-width:420px;padding:10px 16px;transition:all .2s;display:flex;box-shadow:0 4px 14px #00000008}.search-box:focus-within{border-color:var(--emerald);box-shadow:0 0 0 3px #10b98126,0 4px 16px #0000000f}.search-icon{color:var(--text-muted)}.search-box input{width:100%;color:var(--text-heading);background:0 0;border:0;outline:0;font-family:inherit;font-size:.88rem;font-weight:500}.search-box input::placeholder{color:var(--text-light)}.clear-btn{color:var(--text-muted);cursor:pointer;background:0 0;border:0;justify-content:center;align-items:center;display:flex}.clear-btn:hover{color:var(--text-heading)}.chapter-filter-bar{border:1px solid var(--card-border);border-radius:var(--radius-md);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);background:#ffffffbf;align-items:center;gap:14px;margin-bottom:1.25rem;padding:10px 16px;display:flex}.chapter-filter-label{color:var(--text-muted);white-space:nowrap;align-items:center;gap:6px;font-size:.8rem;font-weight:700;display:flex}.chapter-pills-scroll{scrollbar-width:thin;align-items:center;gap:8px;padding-bottom:2px;display:flex;overflow-x:auto}.chapter-pill{color:var(--text-body);border-radius:var(--radius-full);cursor:pointer;white-space:nowrap;background:#fffc;border:1px solid #e2e8f0e6;align-items:center;gap:6px;padding:5px 12px;font-size:.78rem;font-weight:600;transition:all .2s;display:inline-flex}.chapter-pill:hover{background:var(--emerald-subtle);border-color:var(--emerald-border);color:var(--emerald-dark)}.chapter-pill.active{background:var(--emerald-dark);border-color:var(--emerald-dark);color:#fff;box-shadow:0 4px 10px #05966933}.ch-pill-count{opacity:.8;font-size:.7rem}.category-filter-bar{flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:1.25rem;display:flex}.category-pill{border-radius:var(--radius-md);border:1px solid var(--card-border);color:var(--text-muted);cursor:pointer;background:#ffffffd9;align-items:center;gap:8px;padding:8px 16px;font-size:.88rem;font-weight:700;transition:all .2s cubic-bezier(.16,1,.3,1);display:inline-flex;box-shadow:0 2px 6px #00000005}.category-pill:hover{color:var(--text-heading);background:#fff;border-color:#cbd5e1;transform:translateY(-1px)}.category-pill.all-pill.active{background:var(--text-heading);border-color:var(--text-heading);color:#fff;box-shadow:0 4px 14px #0f172a26}.category-pill.lesson-pill.active{background:var(--emerald-subtle);border-color:var(--emerald);color:var(--emerald-dark);box-shadow:0 4px 14px #10b9812e}.category-pill.exam-pill.active{background:var(--orange-subtle);border-color:var(--orange);color:var(--orange-dark);box-shadow:0 4px 14px #f9731633}.library-summary{color:var(--text-muted);margin:0 0 2rem;font-size:.88rem;line-height:1.6}.library-summary strong{color:var(--text-heading)}.chapter-section{margin-bottom:3.5rem}.chapter-header{border-bottom:2px solid #e2e8f0cc;flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:1.5rem;padding-bottom:1rem;display:flex}.chapter-badge{background:linear-gradient(135deg, var(--emerald) 0%, var(--emerald-dark) 100%);color:#fff;border-radius:var(--radius-sm);text-transform:uppercase;letter-spacing:.06em;padding:5px 14px;font-size:.8rem;font-weight:800;box-shadow:0 2px 8px #05966940}.chapter-title{letter-spacing:-.02em;color:var(--text-heading);font-size:1.35rem;font-weight:800}.chapter-items-count{color:var(--emerald-dark);background:var(--emerald-subtle);border:1px solid var(--emerald-border);border-radius:var(--radius-full);margin-left:auto;padding:4px 10px;font-size:.78rem;font-weight:700}.grid{grid-template-columns:repeat(auto-fill,minmax(310px,1fr));gap:1.5rem;display:grid}.card{background:var(--card-bg);border:1px solid var(--card-border);border-radius:var(--radius-lg);cursor:pointer;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);box-shadow:var(--card-shadow);flex-direction:column;justify-content:space-between;gap:1.1rem;padding:1.5rem;transition:all .3s cubic-bezier(.16,1,.3,1);display:flex;position:relative;overflow:hidden}.card-lesson{border-left:5px solid var(--emerald)}.card-lesson:hover{border-color:var(--emerald);transform:translateY(-6px)scale(1.005);box-shadow:0 20px 35px -8px #10b98129,0 8px 16px -4px #0000000a}.card-lesson .card-icon{background:var(--emerald-subtle);color:var(--emerald);border:1px solid var(--emerald-border)}.badge-lesson{background:var(--emerald-subtle);color:var(--emerald-dark);border:1px solid var(--emerald-border)}.action-lesson{color:var(--emerald)}.card-exam{border-left:5px solid var(--orange)}.card-exam:hover{border-color:var(--orange);transform:translateY(-6px)scale(1.005);box-shadow:0 20px 35px -8px #f973162e,0 8px 16px -4px #0000000a}.card-exam .card-icon{background:var(--orange-subtle);color:var(--orange);border:1px solid var(--orange-border)}.badge-exam{background:var(--orange-subtle);color:var(--orange-dark);border:1px solid var(--orange-border)}.action-exam{color:var(--orange)}.card-disabled{opacity:.65;cursor:not-allowed}.card-top-header{justify-content:space-between;align-items:center;gap:10px;display:flex}.card-icon{border-radius:var(--radius-md);flex-shrink:0;justify-content:center;align-items:center;width:44px;height:44px;transition:transform .2s;display:flex}.card:hover .card-icon{transform:scale(1.08)}.card-badge{letter-spacing:.04em;border-radius:var(--radius-sm);text-transform:uppercase;padding:4px 8px;font-size:.68rem;font-weight:800}.card-title{color:var(--text-heading);margin-bottom:.35rem;font-size:1.05rem;font-weight:700;line-height:1.45}.card-subtitle{color:var(--text-muted);font-size:.8rem;line-height:1.5}.card-footer{border-top:1px dashed #e2e8f0cc;padding-top:.75rem}.card-action{align-items:center;font-size:.84rem;font-weight:700;transition:transform .2s;display:inline-flex}.card:hover .card-action{transform:translate(4px)}.empty-state{text-align:center;border:1px dashed var(--card-border);border-radius:var(--radius-lg);color:var(--text-muted);background:#fff;padding:4rem 2rem}.reset-filter-btn{background:var(--emerald-subtle);border:1px solid var(--emerald-border);color:var(--emerald-dark);border-radius:var(--radius-full);cursor:pointer;margin-top:1rem;padding:8px 18px;font-weight:700}.presenter-container{z-index:1000;background:#090d16;justify-content:center;align-items:center;width:100vw;height:100vh;display:flex;position:fixed;top:0;left:0;overflow:hidden}.presenter-top-bar{-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);z-index:100;opacity:0;background:#0f172ad9;border-bottom:1px solid #ffffff1a;justify-content:space-between;align-items:center;gap:16px;height:60px;padding:0 24px;transition:opacity .3s;display:flex;position:absolute;top:0;left:0;right:0}.presenter-container:hover .presenter-top-bar{opacity:1}.presenter-back-btn{border-radius:var(--radius-full);color:#fff;cursor:pointer;background:#ffffff1a;border:1px solid #ffffff26;align-items:center;gap:6px;padding:7px 14px;font-size:.82rem;font-weight:600;transition:all .2s;display:inline-flex}.presenter-back-btn:hover{background:var(--orange);border-color:var(--orange);transform:translate(-2px)}.presenter-title-container{align-items:center;gap:10px;display:flex;overflow:hidden}.presenter-badge{border-radius:var(--radius-sm);white-space:nowrap;padding:3px 8px;font-size:.68rem;font-weight:800}.presenter-doc-title{color:#fff;white-space:nowrap;text-overflow:ellipsis;font-size:.95rem;font-weight:700;overflow:hidden}.presenter-hints{color:#94a3b8;white-space:nowrap;font-size:.74rem}.presenter-hints strong{color:#fff;background:#ffffff26;border-radius:4px;padding:2px 5px}.canvas-wrapper{justify-content:center;align-items:center;width:100%;height:100%;display:flex;position:relative}canvas{object-fit:contain;max-width:100%;max-height:100%;box-shadow:0 0 60px #000000b3}.toolbar{-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);border-radius:var(--radius-full);opacity:0;z-index:50;background:#0f172ad9;border:1px solid #ffffff26;align-items:center;gap:1.25rem;padding:6px 18px;transition:opacity .3s;display:flex;position:absolute;bottom:2rem;left:50%;transform:translate(-50%);box-shadow:0 10px 30px #00000080}.presenter-container:hover .toolbar,.toolbar:focus-within{opacity:1}.toolbar-btn{color:#fff;cursor:pointer;background:0 0;border:none;border-radius:50%;justify-content:center;align-items:center;padding:8px;transition:all .2s;display:flex}.toolbar-btn:hover:not(:disabled){color:var(--orange-light);background:#ffffff26;transform:scale(1.1)}.toolbar-btn:disabled{opacity:.3;cursor:not-allowed}.page-info{font-variant-numeric:tabular-nums;color:#fff;align-items:center;gap:4px;font-size:.92rem;font-weight:700;display:flex}.page-current{color:var(--orange-light)}.page-slash{color:#64748b}.page-total{color:#cbd5e1}.toolbar-divider{background:#fff3;width:1px;height:20px}.loader{color:var(--emerald-light);flex-direction:column;align-items:center;gap:1rem;display:flex}.spinner{border:3px solid #10b98133;border-top-color:var(--emerald-light);border-radius:50%;width:44px;height:44px;animation:.9s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}@media (width<=768px){.gallery-container{padding:1rem}.beamer-topbar{flex-direction:column;align-items:flex-start}.library-tools{flex-direction:column;align-items:stretch}.search-box{max-width:100%}.grid{grid-template-columns:1fr}.presenter-hints{display:none}}.katex-block-wrapper{border-radius:var(--radius-md);scrollbar-width:thin;background:#f8fafcd9;border:1px solid #e2e8f0e6;margin:1.25rem 0;padding:.75rem 1rem;overflow:auto hidden}.katex{text-rendering:auto;font-size:1.08em}.katex-display{overflow:auto hidden;margin:.5em 0!important}.math-rendered-text strong{color:var(--text-heading);font-weight:700}.math-thpt-container{animation:.3s ease-in-out fadeIn}@keyframes fadeIn{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}