@import"https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=DM+Sans:wght@300;400;500;700;800;900&display=swap";:root{--bg: #ffffff;--bg-subtle: #f7f7f7;--border: #e8e8e8;--border-dark: #c8c8c8;--text: #111111;--text-2: #555555;--text-3: #999999;--accent: #c8f000;--accent-2: #a0c800;--font-body: "Inter", system-ui, sans-serif;--font-disp: "DM Sans", system-ui, sans-serif;--transition: .18s ease}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-body);background:var(--bg);color:var(--text);min-height:100vh;line-height:1.6;-webkit-font-smoothing:antialiased}a{text-decoration:none;color:inherit}button{cursor:pointer;border:none;background:none;font-family:inherit;color:inherit}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-track{background:var(--bg)}::-webkit-scrollbar-thumb{background:var(--border-dark)}.container{max-width:1140px;margin:0 auto;padding:0 40px}#header{position:sticky;top:0;z-index:100;background:#ffffffeb;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}.header-inner{display:flex;align-items:center;justify-content:space-between;height:56px;gap:16px}.logo{display:flex;align-items:center;gap:8px;font-family:var(--font-disp);font-size:1rem;font-weight:800;letter-spacing:-.5px;color:var(--text)}.logo-dot{display:inline-block;width:6px;height:6px;background:var(--accent);border-radius:50%}.header-nav{display:flex;align-items:center;gap:0}.nav-btn{padding:6px 14px;font-size:.8rem;font-weight:500;color:var(--text-3);letter-spacing:.02em;border-bottom:2px solid transparent;transition:var(--transition)}.nav-btn:hover{color:var(--text)}.nav-btn.active{color:var(--text);border-bottom-color:var(--text)}#hero{padding:80px 0 60px;border-bottom:1px solid var(--border)}.hero-inner{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:end}.hero-label{font-size:.72rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--text-3);margin-bottom:20px}.hero-title{font-family:var(--font-disp);font-size:clamp(2.6rem,5vw,4rem);font-weight:900;line-height:1;letter-spacing:-2px;color:var(--text)}.hero-title .accent-dot{color:var(--accent)}.hero-right{display:flex;flex-direction:column;gap:24px;align-self:end;padding-bottom:6px}.hero-desc{font-size:.9rem;color:var(--text-2);line-height:1.7;max-width:340px}.search-wrapper{position:relative}#search-input{width:100%;padding:11px 0;background:transparent;border:none;border-bottom:1.5px solid var(--border-dark);color:var(--text);font-family:var(--font-body);font-size:.9rem;outline:none;transition:var(--transition)}#search-input::placeholder{color:var(--text-3)}#search-input:focus{border-bottom-color:var(--text)}#stats-bar{padding:24px 0;border-bottom:1px solid var(--border)}.stats-inner{display:flex;gap:48px;flex-wrap:wrap;align-items:center}.stat{display:flex;align-items:baseline;gap:6px}.stat-num{font-family:var(--font-disp);font-size:1.2rem;font-weight:800;color:var(--text);letter-spacing:-.5px}.stat-label{font-size:.78rem;color:var(--text-3)}.tabs-section{padding:48px 0}.tabs-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:36px;flex-wrap:wrap;gap:16px}.section-title{font-size:.72rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--text-3)}.tabs{display:flex;gap:0;border:1px solid var(--border-dark)}.tab-btn{padding:7px 18px;font-size:.78rem;font-weight:600;letter-spacing:.05em;color:var(--text-3);transition:var(--transition);border-right:1px solid var(--border-dark)}.tab-btn:last-child{border-right:none}.tab-btn.active{background:var(--text);color:var(--bg)}.tab-btn:not(.active):hover{background:var(--bg-subtle);color:var(--text)}#subject-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(170px,1fr));border-top:1px solid var(--border);border-left:1px solid var(--border)}.subject-card{padding:24px 20px;border-right:1px solid var(--border);border-bottom:1px solid var(--border);cursor:pointer;transition:var(--transition);display:flex;flex-direction:column;gap:12px;background:var(--bg);animation:fadeIn .3s ease both}.subject-card:hover{background:var(--bg-subtle)}.subject-card:active{background:var(--accent)}.card-icon{font-size:1.3rem;line-height:1}.card-name{font-family:var(--font-disp);font-size:.9rem;font-weight:700;color:var(--text);letter-spacing:-.2px;line-height:1.25}.card-footer{display:flex;align-items:center;justify-content:space-between;margin-top:auto}.card-arrow{font-size:.72rem;color:var(--text-3);transition:var(--transition)}.card-community-btn{font-size:.68rem;font-weight:600;color:var(--text-3);border:1px solid var(--border);padding:3px 8px;transition:var(--transition);white-space:nowrap}.card-community-btn:hover{background:var(--text);color:var(--bg);border-color:var(--text)}.subject-card:hover .card-arrow{color:var(--text-2)}#modal-overlay{display:none;position:fixed;inset:0;z-index:200;background:#ffffffb3;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);padding:20px;overflow-y:auto;animation:fadeIn .15s ease}#modal-overlay.open{display:flex;align-items:flex-start;justify-content:center}#modal-box{background:var(--bg);border:1px solid var(--border-dark);width:100%;max-width:720px;margin:auto;animation:slideUp .25s ease both;box-shadow:0 24px 80px #00000014}.modal-header{display:flex;align-items:flex-start;justify-content:space-between;padding:28px 32px;border-bottom:1px solid var(--border);gap:12px}.modal-title-group{display:flex;align-items:center;gap:14px}.modal-icon{font-size:1.5rem}.modal-title{font-family:var(--font-disp);font-size:1.4rem;font-weight:900;letter-spacing:-.6px}.modal-subtitle{font-size:.78rem;color:var(--text-3);margin-top:3px;letter-spacing:.02em}.modal-close{width:32px;height:32px;display:flex;align-items:center;justify-content:center;font-size:1rem;color:var(--text-3);border:1px solid var(--border);flex-shrink:0;transition:var(--transition)}.modal-close:hover{background:var(--text);color:var(--bg);border-color:var(--text)}.modal-body{padding:0}.year-block{border-bottom:1px solid var(--border)}.year-header{display:flex;align-items:center;justify-content:space-between;padding:16px 32px;cursor:pointer;transition:var(--transition);font-family:var(--font-disp);font-weight:800;font-size:.95rem;letter-spacing:-.3px;-webkit-user-select:none;user-select:none}.year-header:hover,.year-header.open{background:var(--bg-subtle)}.year-chevron{font-size:.75rem;color:var(--text-3);transition:transform .2s ease}.year-header.open .year-chevron{transform:rotate(180deg)}.year-content{display:none;border-top:1px solid var(--border)}.year-content.open{display:block}.level-row{display:grid;grid-template-columns:160px 1fr 1fr;align-items:center;padding:12px 32px;gap:12px;border-bottom:1px solid var(--border)}.level-row:last-child{border-bottom:none}.level-row:hover{background:#fafafa}.level-badge{font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--text-3)}.level-H{color:var(--text)}.level-O{color:var(--text-2)}.level-F{color:var(--text-3)}.paper-btn{display:inline-flex;align-items:center;gap:6px;font-size:.8rem;font-weight:500;color:var(--text-2);border:1px solid var(--border);padding:6px 12px;transition:var(--transition);white-space:nowrap}.paper-btn:hover{background:var(--text);color:var(--bg);border-color:var(--text)}.paper-btn.ms-btn:hover{background:var(--accent);color:var(--text);border-color:var(--accent)}.paper-btn.disabled{opacity:.35;cursor:default;pointer-events:none;border-style:dashed}#footer{border-top:1px solid var(--border);padding:48px 0 40px;margin-top:0}.footer-inner{display:flex;justify-content:space-between;flex-wrap:wrap;gap:40px}.footer-brand{max-width:300px}.footer-desc{font-size:.8rem;color:var(--text-3);margin-top:12px;line-height:1.7}.footer-links h4{font-size:.68rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--text-3);margin-bottom:12px}.footer-links{display:flex;flex-direction:column;gap:8px}.footer-links a{font-size:.82rem;color:var(--text-2);transition:var(--transition)}.footer-links a:hover{color:var(--text)}.footer-bottom{margin-top:40px;padding-top:20px;border-top:1px solid var(--border);font-size:.75rem;color:var(--text-3);display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}.footer-bottom a{color:var(--text-2)}.footer-bottom a:hover{color:var(--text)}.empty-state{grid-column:1 / -1;padding:60px 0;color:var(--text-3);font-size:.88rem;text-align:center;border-right:1px solid var(--border);border-bottom:1px solid var(--border)}.empty-state .big-icon{font-size:2rem;margin-bottom:10px}#viewer-overlay{display:none;position:fixed;inset:0;z-index:300;background:var(--bg);flex-direction:column}#viewer-overlay.open{display:flex;animation:fadeIn .15s ease}#viewer-toolbar{display:flex;align-items:center;justify-content:space-between;padding:0 20px;height:52px;border-bottom:1px solid var(--border);background:var(--bg);flex-shrink:0;gap:16px}#viewer-title-group{display:flex;align-items:center;gap:10px;min-width:0}#viewer-icon{font-size:1.2rem;flex-shrink:0}#viewer-title{font-family:var(--font-disp);font-size:.9rem;font-weight:700;letter-spacing:-.3px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}#viewer-subtitle{font-size:.72rem;color:var(--text-3);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}#viewer-actions{display:flex;align-items:center;gap:8px;flex-shrink:0}#viewer-download{display:inline-flex;align-items:center;gap:6px;font-size:.78rem;font-weight:500;color:var(--text-2);border:1px solid var(--border-dark);padding:6px 12px;transition:var(--transition);cursor:pointer;text-decoration:none}#viewer-download:hover{background:var(--text);color:var(--bg);border-color:var(--text)}#viewer-close{width:32px;height:32px;display:flex;align-items:center;justify-content:center;font-size:1rem;color:var(--text-3);border:1px solid var(--border);transition:var(--transition);cursor:pointer;background:none;font-family:inherit}#viewer-close:hover{background:var(--text);color:var(--bg);border-color:var(--text)}#viewer-frame{flex:1;width:100%;border:none;background:#f0f0f0}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{opacity:0;transform:translateY(24px)}to{opacity:1;transform:none}}@media(max-width:720px){.container{padding:0 20px}.hero-inner{grid-template-columns:1fr;gap:32px}.hero-title{font-size:2.4rem;letter-spacing:-1.5px}.header-nav{display:none}.tabs-header{flex-direction:column;align-items:flex-start}#subject-grid{grid-template-columns:repeat(2,1fr)}.level-row{grid-template-columns:130px 1fr 1fr;font-size:.78rem}.modal-header{padding:20px}.modal-body{font-size:.85rem}.year-header{padding:14px 20px}.level-row{padding:10px 20px}}