@import url("https://fonts.googleapis.com/css2?family=DM+Sans:wght@300;400;500;700&display=swap");:root{--blue: #1c75bc;--blue-dark: #155f99;--green: #009444;--green-dark: #007a38;--purple: #800080;--purple-dark: #660066;--orange: #f7941e;--orange-dark: #d47c10}*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}body{font-family:'DM Sans', sans-serif;background:#f5f6f8;color:#111827;font-size:16px;min-height:100vh;display:flex;flex-direction:column}main{flex:1}[id]{scroll-margin-top:20px}.om-nav{background:#fff;border-bottom:1px solid #e5e7eb;display:flex;align-items:center;justify-content:space-between;padding:0 2rem;height:68px;position:sticky;top:0;z-index:100}.om-logo{display:flex;align-items:center;gap:10px;cursor:pointer;text-decoration:none;flex-shrink:0}.om-logo-icon{display:grid;grid-template-columns:1fr 1fr;gap:3px;width:34px;height:34px;background:#fff;border:2px solid #111827;border-radius:7px;padding:4px}.om-logo-icon span{display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:900;line-height:1}.om-logo-text{font-size:20px;font-weight:700;color:#111827;letter-spacing:-0.3px;white-space:nowrap}.om-nav-links{display:flex;align-items:center;gap:2px}.om-nav-links>a{color:#374151;font-size:15px;font-weight:700;text-decoration:none;padding:7px 10px;border-radius:6px;transition:background 0.12s;white-space:nowrap}.om-nav-links>a:hover{background:#f3f4f6}.om-nav-cta{background:#1c75bc !important;color:#fff !important;margin-left:4px;border-radius:6px;padding:7px 14px !important}.om-nav-cta:hover{background:#155f99 !important}.om-nav-dropdown{position:relative;display:flex;align-items:center}.om-dropdown-label{color:#374151;font-size:15px;font-weight:700;text-decoration:none;padding:7px 4px 7px 10px;border-radius:6px 0 0 6px;transition:background 0.12s;white-space:nowrap}.om-dropdown-arrow{color:#374151;font-size:13px;font-weight:700;padding:7px 8px 7px 4px;border-radius:0 6px 6px 0;transition:background 0.12s;white-space:nowrap;cursor:pointer;background:none;border:none;font-family:'DM Sans', sans-serif;line-height:1}.om-dropdown-label:hover,.om-nav-dropdown:hover .om-dropdown-label{background:#f3f4f6}.om-dropdown-arrow:hover,.om-nav-dropdown:hover .om-dropdown-arrow{background:#f3f4f6}.om-dropdown-menu{display:none;position:absolute;top:100%;left:0;background:#fff;border:1px solid #e5e7eb;border-radius:8px;box-shadow:0 4px 16px rgba(0,0,0,0.1);min-width:180px;padding:6px;padding-top:16px;z-index:200}.om-nav-dropdown:hover .om-dropdown-menu{display:block}.om-dropdown-menu a{display:block;font-size:14px;font-weight:700;color:#374151;text-decoration:none;padding:5px 12px 5px 8px;border-radius:5px;white-space:nowrap;background:none;transition:background 0.12s;border-left:3px solid transparent;margin-bottom:7px}.om-dropdown-menu a:last-child{margin-bottom:0}.om-dropdown-menu a:hover{background:#f3f4f6;color:#111827}.om-nav-hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:6px;flex-shrink:0}.om-nav-hamburger span{display:block;width:24px;height:2px;background:#374151;border-radius:2px}.om-nav-drawer{display:none;position:absolute;top:68px;left:0;right:0;background:#fff;border-bottom:1px solid #e5e7eb;padding:1rem 2rem;flex-direction:column;gap:2px;z-index:99;box-shadow:0 4px 12px rgba(0,0,0,0.08)}.om-nav-drawer.open{display:flex}.om-nav-drawer>a{color:#374151;font-size:16px;font-weight:700;text-decoration:none;padding:12px 0;border-bottom:1px solid #f3f4f6}.om-nav-drawer>a:last-child{border-bottom:none}.om-nav-drawer>a:last-child{display:block;background:#1c75bc;color:#fff !important;border-radius:6px;padding:10px 14px;margin-top:8px;text-align:center}.om-drawer-section{border-bottom:1px solid #f3f4f6}.om-drawer-section-title{font-size:16px;font-weight:700;color:#374151;padding:12px 0 8px;display:flex;align-items:center;justify-content:space-between;cursor:pointer}.om-drawer-sub{padding-left:0;border-left:none;margin:0 0 8px;display:none;flex-direction:column}.om-drawer-sub.open{display:flex}.om-drawer-sub a{font-size:14px !important;font-weight:300 !important;color:#6b7280 !important;padding:5px 12px 5px 8px !important;border-bottom:none !important;border-left:3px solid transparent;margin-bottom:7px;display:block;text-decoration:none;border-radius:5px}.om-drawer-sub a:last-child{margin-bottom:0}.om-drawer-sub a:hover{color:#111827 !important;background:#f3f4f6}.om-footer{background:#0f1120;display:flex;justify-content:space-between;align-items:center;padding:0.85rem 2rem;font-size:13px;color:#6b7280;margin-top:1px;font-weight:300;flex-wrap:wrap;gap:8px}.om-footer div{display:flex;align-items:center}.om-footer a{color:#9ca3af;text-decoration:none;margin-left:1.25rem;font-weight:500;transition:color 0.12s;display:inline-flex;align-items:center;gap:5px}.om-footer a:hover{color:#fff}.om-footer-fb svg{width:14px;height:14px;fill:currentColor;flex-shrink:0;position:relative;top:-1px}.om-body{max-width:1100px;margin:0 auto;padding:3rem 2rem}.om-section-hd{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:1.5rem}.om-section-hd h2{font-size:30px;color:#111827;font-weight:700;letter-spacing:-0.3px}.om-section-hd a{font-size:14px;color:var(--orange);text-decoration:none;font-weight:500}.om-divider{border:none;border-top:1px solid #e5e7eb;margin:3rem 0}.om-hero{background:#0f1120;padding:3rem 2rem 0;text-align:center;display:flex;flex-direction:column;align-items:center}.om-hero-content{position:relative;z-index:1;margin-bottom:2.5rem}.om-hero h1{font-size:52px;color:#fff;margin:0 0 0.85rem;line-height:1.12;font-weight:700;letter-spacing:-0.5px}.om-hero h1 em{color:var(--orange);font-style:normal}.om-hero p{color:#9ca3af;font-size:18px;max-width:560px;margin:0 auto;line-height:1.7;font-weight:300;text-align:center}.om-hero-btns{position:relative;z-index:1;display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-bottom:4rem}.om-btn-green{background:var(--orange);color:#fff;padding:13px 26px;border-radius:8px;font-size:15px;font-weight:700;border:none;cursor:pointer;font-family:'DM Sans', sans-serif;transition:background 0.12s;text-decoration:none;display:inline-block}.om-btn-green:hover{background:var(--orange-dark)}.om-btn-dark-outline{background:transparent;color:#fff;padding:13px 26px;border-radius:8px;font-size:15px;font-weight:700;border:1.5px solid rgba(255,255,255,0.25);cursor:pointer;font-family:'DM Sans', sans-serif;transition:border-color 0.12s;text-decoration:none;display:inline-block}.om-btn-dark-outline:hover{border-color:rgba(255,255,255,0.55)}.om-btn-blue{background:var(--blue);color:#fff;padding:13px 26px;border-radius:8px;font-size:15px;font-weight:700;border:none;cursor:pointer;font-family:'DM Sans', sans-serif;transition:background 0.12s;text-decoration:none;display:inline-block}.om-btn-blue:hover{background:#155fa0}.om-hero-ws-row{display:flex;gap:16px;align-items:flex-end;justify-content:center}.om-hero-ws{border-radius:5px 5px 0 0;overflow:hidden;box-shadow:0 -6px 28px rgba(0,0,0,0.55);flex-shrink:0;position:relative;width:155px;height:135px}.om-hero-ws:nth-child(2),.om-hero-ws:nth-child(4){height:168px}.om-hero-ws:nth-child(3){width:180px;height:200px}.om-hero-ws img{display:block;width:100%;height:100%;object-fit:cover;object-position:top left}.om-hero-ws::after{content:"";position:absolute;bottom:0;left:0;right:0;height:25%;background:linear-gradient(to top, #0f1120 0%, transparent 100%);pointer-events:none}.om-hero::after{content:"";display:block;height:3rem;width:100%;background:#0f1120}@media (max-width: 1050px){.om-hero-ws{width:150px;height:135px}.om-hero-ws:nth-child(2),.om-hero-ws:nth-child(4){height:165px}.om-hero-ws:nth-child(3){width:175px;height:198px}}@media (max-width: 800px){.om-hero-ws{width:110px;height:100px}.om-hero-ws:nth-child(2),.om-hero-ws:nth-child(4){height:122px}.om-hero-ws:nth-child(3){width:130px;height:148px}}@media (max-width: 700px){.om-hero h1{font-size:34px}.om-hero p{font-size:16px}}@media (max-width: 480px){.om-hero-ws:nth-child(4),.om-hero-ws:nth-child(5){display:none}.om-hero-ws{width:115px;height:115px}.om-hero-ws:nth-child(2){height:170px;width:130px}.om-hero-ws:nth-child(3){height:140px;width:115px}.om-hero-ws::after{height:40%}}.om-strip{background:#fff;border-bottom:1px solid #e5e7eb;display:flex}.om-strip-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:1.5rem 0.75rem;border-right:1px solid #e5e7eb;text-decoration:none;transition:background 0.12s;border-top:3px solid var(--sc)}.om-strip-item:last-child{border-right:none}.om-strip-item:hover{background:#f9fafb}.om-strip-item:hover .om-strip-title{color:var(--sc)}.om-strip-title{font-size:15px;font-weight:700;color:#111827;transition:color 0.12s}.om-strip-sub{font-size:13px;color:#6b7280;margin-top:4px;font-weight:300}.om-latest{display:grid;grid-template-columns:repeat(3, 1fr);gap:14px;margin-bottom:3rem}.om-latest-card{background:#fff;border:1px solid #e5e7eb;border-radius:10px;overflow:hidden;display:flex;flex-direction:column}.om-latest-card-top{height:5px}.om-ws-img{background:#f3f4f6;border-bottom:1px solid #e5e7eb;height:155px;display:flex;align-items:center;justify-content:center;padding:10px}.om-ws-img-inner{background:#fff;border:1px solid #e0e0e0;box-shadow:0 1px 4px rgba(0,0,0,0.1);display:flex;flex-direction:column;padding:7px 8px;gap:4px;border-radius:2px}.om-ws-img-inner.portrait{width:88px;height:130px}.om-ws-img-inner.landscape{width:180px;height:95px}.om-wsi-title{height:6px;border-radius:2px;margin-bottom:2px}.om-wsi-line{height:4px;background:#e5e7eb;border-radius:2px}.om-wsi-line.s{width:50%}.om-wsi-line.m{width:70%}.om-wsi-line.f{width:100%}.om-wsi-row{display:flex;gap:5px;align-items:center}.om-wsi-num{font-size:7px;color:#d1d5db;width:8px;flex-shrink:0;font-weight:700}.om-wsi-box{width:20px;height:11px;border:1.5px solid #d1d5db;border-radius:1px;flex-shrink:0}.om-latest-card-body{padding:14px 16px;flex:1;display:flex;flex-direction:column}.om-latest-tag{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:0.6px;color:#9ca3af;margin-bottom:6px}.om-latest-title{font-size:16px;font-weight:700;color:#111827;margin:0 0 6px;line-height:1.4}.om-latest-desc{font-size:14px;color:#6b7280;margin:0 0 14px;line-height:1.6;flex:1;font-weight:300}.om-latest-btns{display:flex;flex-direction:column;gap:6px}.om-cbtn{font-size:13px;font-weight:700;padding:8px 11px;border-radius:6px;border:1.5px solid;cursor:pointer;text-decoration:none;white-space:nowrap;transition:background 0.12s, border-color 0.12s;font-family:'DM Sans', sans-serif;color:#fff;display:block;text-align:center;width:100%}.om-cbtn-ws{background:var(--blue);border-color:var(--blue)}.om-cbtn-ws:hover{background:var(--blue-dark);border-color:var(--blue-dark)}.om-cbtn-ans{background:var(--green);border-color:var(--green)}.om-cbtn-ans:hover{background:var(--green-dark);border-color:var(--green-dark)}.om-cbtn-tes{background:var(--orange);border-color:var(--orange)}.om-cbtn-tes:hover{background:var(--orange-dark);border-color:var(--orange-dark)}.om-books{display:grid;grid-template-columns:repeat(3, 1fr);gap:14px}.om-book-card{background:#fff;border:1px solid #e5e7eb;border-radius:10px;overflow:hidden;display:flex;flex-direction:column;text-decoration:none;transition:border-color 0.12s, transform 0.12s}.om-book-card:hover{border-color:var(--blue);transform:translateY(-2px)}.om-book-cover{height:155px;display:flex;align-items:center;justify-content:center}.om-book-cover-inner{width:84px;height:114px;border-radius:4px;display:flex;align-items:center;justify-content:center;font-size:28px;box-shadow:3px 3px 12px rgba(0,0,0,0.18)}.om-book-body{padding:14px 16px;flex:1;display:flex;flex-direction:column}.om-book-title{font-size:15px;font-weight:700;color:#111827;margin:0 0 5px;line-height:1.4}.om-book-sub{font-size:13px;color:#6b7280;margin:0 0 14px;flex:1;font-weight:300}.om-book-btn{display:block;text-align:center;font-size:13px;font-weight:700;color:#fff;background:var(--orange);border:1.5px solid var(--orange);padding:8px 12px;border-radius:6px;width:100%;transition:background 0.12s, border-color 0.12s}.om-book-btn:hover{background:var(--orange-dark);border-color:var(--orange-dark)}.om-sats{background:#0f1120;border-radius:12px;padding:2.25rem 2.25rem 2.25rem 2.75rem;display:flex;align-items:center;justify-content:space-between;gap:2rem;margin-top:3rem;overflow:hidden}.om-sats h2{font-size:26px;color:#fff;margin:0 0 8px;font-weight:700}.om-sats p{color:#9ca3af;font-size:15px;margin:0 0 1.5rem;line-height:1.65;max-width:440px;font-weight:300}.om-sats-image{flex-shrink:0;width:180px;height:140px;background:#1e2240;border-radius:10px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px;border:1.5px solid #2e3460}.om-sats-screen{width:130px;height:80px;background:#2a3060;border-radius:6px;display:flex;align-items:center;justify-content:center}.om-sats-slide{width:110px;height:65px;background:#fff;border-radius:4px;display:flex;flex-direction:column;padding:6px 8px;gap:4px;box-shadow:0 2px 8px rgba(0,0,0,0.3)}.om-sats-slide-title{height:7px;background:var(--blue);border-radius:2px;width:70%}.om-sats-slide-line{height:4px;background:#e5e7eb;border-radius:2px}.om-sats-slide-line.s{width:55%}.om-sats-slide-line.m{width:75%}.om-sats-slide-accent{height:18px;background:#f0faf4;border-radius:3px;border-left:3px solid var(--green)}.om-sats-stand{width:4px;height:20px;background:#2e3460;border-radius:2px}.om-sats-base{width:50px;height:6px;background:#2e3460;border-radius:3px}.section-heading{font-size:22px;font-weight:700;color:#111827;margin:2rem 0 1rem;padding-bottom:0.5rem;border-bottom:2px solid #e5e7eb}.worksheet-list{display:flex;flex-direction:column;gap:14px;margin-bottom:2rem}.worksheet-card{background:#fff;border:1px solid #e5e7eb;border-radius:10px;overflow:hidden;display:flex;flex-direction:row;align-items:center}.wc-image{background:#fff;border-right:1px solid #e5e7eb;display:flex;align-items:center;justify-content:center;padding:10px;width:160px;flex-shrink:0}.wc-image.portrait{height:220px}.wc-image.landscape{height:160px}.wc-image img{width:100%;height:100%;object-fit:contain}.wc-content{padding:14px 16px;flex:1;display:flex;flex-direction:column}.wc-title{font-size:15px;font-weight:700;color:#111827;margin:0 0 6px;line-height:1.4}.wc-desc{font-size:13px;color:#6b7280;line-height:1.6;flex:1;font-weight:300}.wc-actions{padding:12px 16px;display:flex;flex-direction:row;gap:6px;flex-shrink:0;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;gap:5px;font-size:13px;font-weight:700;padding:8px 14px;border-radius:6px;border:1.5px solid transparent;cursor:pointer;text-decoration:none;transition:background 0.12s, border-color 0.12s;font-family:'DM Sans', sans-serif;color:#fff;white-space:nowrap}.btn-blue{background:var(--blue);border-color:var(--blue)}.btn-blue:hover{background:var(--blue-dark);border-color:var(--blue-dark)}.btn-green{background:var(--green);border-color:var(--green)}.btn-green:hover{background:var(--green-dark);border-color:var(--green-dark)}.btn-orange{background:var(--orange);border-color:var(--orange)}.btn-orange:hover{background:var(--orange-dark);border-color:var(--orange-dark)}.btn-outline-orange{display:inline-flex;align-items:center;gap:5px;background:transparent;border:1.5px solid var(--orange);color:var(--orange);font-family:'DM Sans', sans-serif;font-size:13px;font-weight:700;padding:8px 14px;border-radius:6px;cursor:pointer;transition:background 0.12s, color 0.12s;white-space:nowrap;text-decoration:none}.btn-outline-orange:hover{background:var(--orange);color:#fff}.om-hero-note{font-size:13px;color:#6b7280;margin:0 auto 2rem;max-width:620px}.om-hero-note a{color:#9ca3af;text-decoration:underline}.jump-links{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:1.75rem}.jump-link{display:inline-block;background:transparent;border:1.5px solid #4b5563;color:#9ca3af;font-family:'DM Sans', sans-serif;font-size:14px;font-weight:700;padding:7px 16px;border-radius:6px;cursor:pointer;transition:background 0.15s, color 0.15s, border-color 0.15s;text-decoration:none}.jump-link:hover{background:#1e2235;color:#e5e7eb;border-color:#6b7280}.covid-strip{background:#fff;border-bottom:1px solid #e5e7eb;text-align:center;font-size:13px;font-weight:300;color:#6b7280;padding:10px 2rem}.year-section{margin-top:3rem}.year-section:first-of-type{margin-top:0}.year-card{background:#fff;border:1px solid #e5e7eb;border-radius:10px;margin-bottom:1.25rem;overflow:hidden}.year-card-header{display:flex;align-items:center;justify-content:space-between;padding:1.1rem 1.5rem;border-bottom:1px solid #f3f4f6;gap:1rem}.year-label{font-size:20px;font-weight:700;color:#111827}.year-badge{font-size:12px;font-weight:700;color:#6b7280;background:#f3f4f6;border:1px solid #e5e7eb;border-radius:6px;padding:3px 10px;white-space:nowrap}.paper-list{display:flex;flex-direction:column}.paper-row{display:flex;align-items:center;gap:1.25rem;padding:1rem 1.5rem;border-bottom:1px solid #f3f4f6}.paper-row:last-child{border-bottom:none}.paper-thumb{flex-shrink:0;width:80px;height:110px;background:#f3f4f6;border:1px solid #e5e7eb;border-radius:4px;display:flex;align-items:center;justify-content:center;overflow:hidden}.paper-thumb img{width:100%;height:100%;object-fit:cover}.paper-thumb-placeholder{display:flex;flex-direction:column;align-items:center;justify-content:center;width:100%;height:100%;gap:4px}.ptp-lines{display:flex;flex-direction:column;gap:3px;width:34px}.ptp-line{height:2px;background:#d1d5db;border-radius:1px}.ptp-line:nth-child(1){width:100%}.ptp-line:nth-child(2){width:80%}.ptp-line:nth-child(3){width:90%}.ptp-line:nth-child(4){width:65%}.ptp-line:nth-child(5){width:85%}.ptp-line:nth-child(6){width:70%}.paper-info{flex:1;min-width:0}.paper-name{font-size:15px;font-weight:700;color:#111827;margin-bottom:2px}.paper-type{font-size:13px;font-weight:300;color:#6b7280}.paper-tag{display:inline-block;font-size:11px;font-weight:700;padding:2px 8px;border-radius:6px;margin-bottom:4px;text-transform:uppercase;letter-spacing:0.04em}.tag-arith{background:#eff6ff;color:var(--blue)}.tag-reason{background:#f5f0ff;color:var(--purple)}.tag-mark{background:#fff7ed;color:var(--orange)}.paper-btns{display:flex;gap:8px;align-items:center;flex-wrap:wrap;flex-shrink:0}.answers-row{background:#fafafa;border-top:1px solid #e5e7eb;padding:0.85rem 1.5rem;display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}.answers-label{font-size:13px;font-weight:700;color:#6b7280;text-transform:uppercase;letter-spacing:0.05em}.promo-card{background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:1.1rem 1.5rem;margin-bottom:1.25rem;display:flex;align-items:center;justify-content:space-between;gap:1.5rem;flex-wrap:wrap}.promo-thumb{flex-shrink:0;width:70px;height:100px;background:#f3f4f6;border:1px solid #e5e7eb;border-radius:4px;display:flex;align-items:center;justify-content:center;overflow:hidden}.promo-text{display:flex;flex-direction:column;gap:3px;flex:1;min-width:200px;font-size:14px;color:#374151;line-height:1.5}.promo-text strong{font-size:15px;color:#111827}.sats-page .section-heading{font-size:15px;font-weight:700;color:var(--blue);text-transform:uppercase;letter-spacing:0.05em;border-bottom:2px solid var(--blue);padding-bottom:8px;margin-bottom:1.5rem;margin-top:0}.sats-page .om-hero{min-height:0;padding:4rem 2rem 3.5rem}.contact-card{max-width:900px;margin:3rem auto;padding:0 2rem;display:grid;grid-template-columns:1fr 1fr;gap:3rem}.contact-left h2{font-size:26px;font-weight:700;margin-bottom:1rem}.contact-left p{font-size:15px;color:#6b7280;line-height:1.7;margin-bottom:1rem;font-weight:300}.email-plain{color:var(--blue)}.contact-form{display:flex;flex-direction:column;gap:1rem}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}.contact-form label{font-size:13px;font-weight:700;color:#374151;display:block;margin-bottom:4px}.contact-form input,.contact-form select,.contact-form textarea{width:100%;padding:10px 12px;border:1.5px solid #e5e7eb;border-radius:6px;font-family:'DM Sans', sans-serif;font-size:14px;color:#111827;background:#fff;transition:border-color 0.12s}.contact-form input:focus,.contact-form select:focus,.contact-form textarea:focus{outline:none;border-color:var(--blue)}.contact-form textarea{resize:vertical;min-height:140px}.hidden{display:none}@media (max-width: 900px){.om-nav-links{display:none}.om-nav-hamburger{display:flex}.om-hero h1{font-size:38px;white-space:normal}.om-hero p{font-size:16px}.om-strip{flex-wrap:wrap}.om-strip-item{flex:1 1 33.333%}.om-strip-item:nth-child(3){border-right:none}.om-strip-item:nth-child(4),.om-strip-item:nth-child(5){border-top:1px solid #e5e7eb}.om-strip-item:nth-child(5){border-right:none}.om-sats-image{display:none}.contact-card{grid-template-columns:1fr;gap:2rem}}@media (max-width: 780px){.paper-btns{flex-direction:column;width:100%}.paper-btns .btn,.paper-btns .btn-outline-orange{width:100%;justify-content:center}.paper-row{flex-wrap:wrap}.answers-row{flex-direction:column;align-items:flex-start}.answers-row .btn{width:100%;justify-content:center}.promo-card{flex-direction:column;align-items:flex-start}.promo-card .btn{width:100%;text-align:center;justify-content:center}}@media (max-width: 600px){.om-hero{min-height:400px;padding:3rem 1.5rem 2.5rem}.om-hero h1{font-size:30px}.om-hero p{font-size:15px}.om-hero-btns{flex-direction:column;align-items:center;padding-top:2rem}.om-btn-green,.om-btn-dark-outline,.om-btn-blue{width:100%;max-width:300px;text-align:center}.om-strip{flex-direction:column;flex-wrap:nowrap}.om-strip-item{flex:none;border-right:none;border-top:none !important;border-left:3px solid var(--sc);border-bottom:1px solid #e5e7eb;flex-direction:row;justify-content:flex-start;gap:12px;padding:1rem 1.5rem;text-align:left}.om-strip-item:last-child{border-bottom:none}.om-latest{grid-template-columns:1fr}.om-books{grid-template-columns:1fr}.om-section-hd h2{font-size:24px}.om-latest-title{font-size:15px}.om-latest-desc{font-size:13px}.om-sats{flex-direction:column;padding:1.75rem}.om-sats h2{font-size:22px}.om-sats p{font-size:14px}.om-body{padding:2rem 1.25rem}.om-footer{flex-direction:column;text-align:center}.om-footer a{margin-left:0.75rem}.om-footer div{display:flex;flex-wrap:wrap;justify-content:center}.form-row{grid-template-columns:1fr}.worksheet-list{grid-template-columns:1fr}.year-card-header{flex-direction:column;align-items:flex-start;gap:6px}.paper-thumb{width:44px;height:62px}.intro-card{grid-template-columns:1fr !important}.intro-card img{width:140px !important;margin:0 auto;order:2}.intro-body{order:1}.sats-overview-grid{grid-template-columns:1fr !important}}.worksheet-page .worksheet-list{display:flex;flex-direction:column;gap:12px;margin-bottom:0}.worksheet-page .worksheet-card{display:flex;align-items:stretch;flex-direction:row}.worksheet-page .wc-image{flex-shrink:0;background:#fff;border-bottom:none;padding:0}.worksheet-page .wc-image.portrait{width:120px;height:100%;max-height:170px;align-self:center;display:flex;align-items:center}.worksheet-page .wc-image.landscape{width:180px;height:auto}.worksheet-page .wc-image img{width:100%;height:100%;object-fit:contain}.wc-image-placeholder{display:flex;align-items:center;justify-content:center;width:100%;height:100%}.wc-image-placeholder svg{opacity:0.25}.worksheet-page .wc-content{padding:16px 20px;flex:1;display:flex;flex-direction:column;justify-content:center;gap:4px}.worksheet-page .wc-actions{display:flex;align-items:center;gap:8px;padding:16px 20px 16px 0;flex-shrink:0;border-top:none}.om-hero-nav{margin-top:1.5rem;padding-bottom:0.75rem;width:100%;max-width:820px}.om-hero-nav-grid{display:flex;flex-wrap:wrap;gap:7px;justify-content:center}.om-hero-nav a{display:inline-block;font-size:12px;font-weight:700;color:#d1d5db;text-decoration:none;padding:5px 11px;border:1.5px solid #374151;border-radius:6px;background:transparent;transition:background 0.12s, color 0.12s, border-color 0.12s;white-space:nowrap}.om-hero-nav a:hover{background:#374151;color:#fff;border-color:#374151}.topic-grid{display:grid;grid-template-columns:repeat(3, 1fr);gap:16px}.topic-card{background:#fff;border:1px solid #e5e7eb;border-radius:10px;overflow:hidden;display:flex;flex-direction:column;text-decoration:none;color:inherit;transition:border-color 0.15s}.topic-card:hover{border-color:#c0c4cc}.card-bar{height:5px}.card-body{padding:22px 20px 20px;flex:1;display:flex;flex-direction:column}.card-title{font-size:18px;font-weight:700;color:#111827;margin:0 0 20px}.card-cta{display:inline-flex;align-items:center;gap:5px;font-size:13px;font-weight:700;padding:7px 13px;border-radius:6px;border:1.5px solid;align-self:flex-start;transition:opacity 0.12s;margin-top:auto;text-decoration:none}.card-cta:hover{opacity:0.7}.topic-card.blue .card-bar{background:var(--blue)}.topic-card.blue .card-cta{color:var(--blue);border-color:var(--blue);background:#eef5fd}.topic-card.green .card-bar{background:var(--green)}.topic-card.green .card-cta{color:var(--green);border-color:var(--green);background:#f0faf4}.topic-card.purple .card-bar{background:var(--purple)}.topic-card.purple .card-cta{color:var(--purple);border-color:var(--purple);background:#f9f0f9}.topic-card.orange .card-bar{background:var(--orange)}.topic-card.orange .card-cta{color:#c47210;border-color:var(--orange);background:#fff8f0}.test-tabs{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}.test-tab{background:transparent;border:1.5px solid #4b5563;color:#9ca3af;font-family:'DM Sans', sans-serif;font-size:14px;font-weight:700;padding:7px 16px;border-radius:6px;cursor:pointer;transition:background 0.15s, color 0.15s, border-color 0.15s}.test-tab:hover{background:#1e2235;color:#e5e7eb;border-color:#6b7280}.test-tab.active{background:#1e2235;color:#fff;border-color:#9ca3af}.test-panel{display:none}.test-panel.active{display:block}.setup-card{background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:0;max-width:760px;margin:0 auto;overflow:hidden}.setup-section{padding:1.25rem 1.75rem;border-bottom:1px solid #f3f4f6}.setup-section:last-of-type{border-bottom:none}.setup-section-title{font-size:11px;font-weight:700;color:#9ca3af;text-transform:uppercase;letter-spacing:0.8px;margin-bottom:0.65rem;display:block}.setup-label{font-size:13px;font-weight:700;color:#6b7280;text-transform:uppercase;letter-spacing:0.5px;margin-bottom:0.6rem;display:block}.table-grid{display:flex;flex-wrap:wrap;gap:8px}.table-btn{background:#f5f6f8;border:1.5px solid #e5e7eb;color:#374151;font-family:'DM Sans', sans-serif;font-size:14px;font-weight:700;padding:7px 14px;border-radius:6px;cursor:pointer;transition:background 0.12s, border-color 0.12s, color 0.12s}.table-btn:hover{background:#e5e7eb;border-color:#9ca3af;color:#111827}.table-btn.selected{background:#111827;border-color:#111827;color:#fff}.option-row{display:flex;gap:8px;flex-wrap:wrap}.option-btn{background:#f5f6f8;border:1.5px solid #e5e7eb;color:#374151;font-family:'DM Sans', sans-serif;font-size:14px;font-weight:700;padding:7px 18px;border-radius:6px;cursor:pointer;transition:background 0.12s, border-color 0.12s, color 0.12s}.option-btn.blue-btn:hover{background:#eef5fd;border-color:var(--blue);color:var(--blue)}.option-btn.blue-btn.selected{background:var(--blue);border-color:var(--blue);color:#fff}.option-btn.green-btn:hover{background:#f0faf4;border-color:var(--green);color:var(--green)}.option-btn.green-btn.selected{background:var(--green);border-color:var(--green);color:#fff}.option-btn.purple-btn:hover{background:#f9f0f9;border-color:var(--purple);color:var(--purple)}.option-btn.purple-btn.selected{background:var(--purple);border-color:var(--purple);color:#fff}.time-options{margin-top:0.75rem;display:none}.time-options.visible{display:block}.start-btn{display:block;width:100%;padding:14px;background:var(--orange);border:1.5px solid var(--orange);color:#fff;font-family:'DM Sans', sans-serif;font-size:16px;font-weight:700;border-radius:6px;cursor:pointer;transition:background 0.12s, border-color 0.12s;letter-spacing:0.5px;text-transform:uppercase}.start-btn:hover{background:var(--orange-dark);border-color:var(--orange-dark)}.start-btn:disabled{background:#d1d5db;border-color:#d1d5db;cursor:not-allowed}.quiz-card{background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:2rem;max-width:680px;margin:0 auto;display:none}.quiz-card.active{display:block}.quiz-meta{display:flex;justify-content:space-between;align-items:center;margin-bottom:1.5rem;flex-wrap:wrap;gap:8px}.quiz-progress{font-size:13px;font-weight:700;color:#6b7280}.quiz-timer{font-size:18px;font-weight:700;color:var(--blue);font-variant-numeric:tabular-nums}.quiz-timer.warning{color:var(--orange)}.quiz-timer.danger{color:#dc2626}.progress-bar-track{height:4px;background:#f3f4f6;border-radius:2px;margin-bottom:2rem}.progress-bar-fill{height:4px;background:var(--blue);border-radius:2px;transition:width 0.3s ease}.quiz-question{font-size:36px;font-weight:700;color:#111827;text-align:center;margin-bottom:2rem;letter-spacing:-0.5px}.quiz-input-wrap{display:flex;justify-content:center;margin-bottom:0.75rem}.quiz-input{font-family:'DM Sans', sans-serif;font-size:36px;font-weight:700;color:#111827;text-align:center;width:180px;padding:12px 16px;border:2px solid #e5e7eb;border-radius:8px;outline:none;transition:border-color 0.15s;-moz-appearance:textfield}.quiz-input::-webkit-outer-spin-button,.quiz-input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}.quiz-input:focus{border-color:var(--blue)}.quiz-next-btn{display:block;width:100%;padding:12px;background:var(--blue);border:1.5px solid var(--blue);color:#fff;font-family:'DM Sans', sans-serif;font-size:15px;font-weight:700;border-radius:6px;cursor:pointer;transition:background 0.12s, border-color 0.12s}.quiz-next-btn:hover{background:var(--blue-dark);border-color:var(--blue-dark)}.quiz-menu-btn{display:block;width:100%;margin-top:10px;padding:10px;background:#fff;border:1.5px solid #e5e7eb;color:#374151;font-family:'DM Sans', sans-serif;font-size:14px;font-weight:700;border-radius:6px;cursor:pointer;transition:background 0.12s, border-color 0.12s;text-transform:uppercase;letter-spacing:0.4px}.quiz-menu-btn:hover{background:#f5f6f8;border-color:#d1d5db}.results-card{background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:2rem;max-width:680px;margin:0 auto;display:none;text-align:center}.results-card.active{display:block}.results-score{font-size:64px;font-weight:700;color:var(--blue);line-height:1;margin-bottom:0.25rem}.results-label{font-size:16px;color:#6b7280;font-weight:300;margin-bottom:0.5rem}.results-time{font-size:14px;color:#9ca3af;font-weight:300;margin-bottom:1.5rem}.results-perfect{font-size:20px;font-weight:700;color:var(--green);margin-bottom:1.5rem}.results-wrong{text-align:left;margin-bottom:1.5rem}.results-wrong h3{font-size:13px;font-weight:700;color:#6b7280;text-transform:uppercase;letter-spacing:0.5px;margin-bottom:0.75rem}.wrong-list{list-style:none;display:flex;flex-direction:column;gap:6px;max-height:320px;overflow-y:auto;padding-right:4px}.wrong-list li{display:flex;align-items:center;gap:10px;font-size:15px;font-weight:300;flex-wrap:wrap}.wrong-list li .q{font-weight:700;color:#111827;min-width:90px}.wrong-list li .your-ans{color:#dc2626}.wrong-list li .not-ans{color:#9ca3af;font-style:italic}.results-actions{display:flex;gap:10px;flex-wrap:wrap}.results-btn{flex:1;min-width:140px;padding:12px 16px;font-family:'DM Sans', sans-serif;font-size:14px;font-weight:700;border-radius:6px;cursor:pointer;transition:background 0.12s, border-color 0.12s;text-transform:uppercase;letter-spacing:0.4px}.results-btn.primary{background:var(--blue);border:1.5px solid var(--blue);color:#fff}.results-btn.primary:hover{background:var(--blue-dark);border-color:var(--blue-dark)}.results-btn.secondary{background:#fff;border:1.5px solid #e5e7eb;color:#374151}.results-btn.secondary:hover{background:#f5f6f8;border-color:#d1d5db}.results-btn.green-btn{background:var(--green);border:1.5px solid var(--green);color:#fff}.results-btn.green-btn:hover{background:var(--green-dark);border-color:var(--green-dark)}.coming-soon{text-align:center;padding:4rem 2rem;color:#9ca3af}.coming-soon p{font-size:17px;font-weight:300}.section-label{font-size:15px;font-weight:700;color:var(--blue);text-transform:uppercase;letter-spacing:0.06em;border-bottom:2px solid var(--blue);display:inline-block;padding-bottom:3px;margin-bottom:1.5rem}.overview-card{background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:2rem;display:grid;grid-template-columns:200px 1fr 1fr;gap:2rem;align-items:start;margin-bottom:2.5rem}.overview-card h2.card-heading{font-size:1.5rem;font-weight:700;margin-bottom:0.6rem}.overview-card p{color:#444;margin-bottom:1rem}.pricing-panel{background:#f5f6f8;border:1px solid #e5e7eb;border-radius:10px;padding:1.5rem;text-align:center}.pricing-panel .course-tag{font-size:0.75rem;font-weight:700;text-transform:uppercase;letter-spacing:0.08em;color:var(--blue);margin-bottom:0.25rem}.pricing-panel .price{font-size:2.5rem;font-weight:700;color:#1a1a2e;line-height:1;margin:0.25rem 0 0.1rem}.pricing-panel .price-note{font-size:0.8rem;color:#9ca3af;margin-bottom:1.25rem}.pricing-panel ul{list-style:none;text-align:left;margin-bottom:1.5rem}.pricing-panel ul li{font-size:0.9rem;padding:0.35rem 0;border-bottom:1px solid #e5e7eb;display:flex;gap:0.5rem;align-items:flex-start}.pricing-panel ul li:last-child{border-bottom:none}.pricing-panel ul li::before{content:'✓';color:var(--green);font-weight:700;flex-shrink:0}.btn-full{display:block;text-align:center;width:100%}.included-grid{display:grid;grid-template-columns:repeat(3, 1fr);gap:1.25rem}.included-card{background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:1.5rem}.included-icon{font-size:1.75rem;margin-bottom:0.6rem;display:block}.included-card h3{font-size:1rem;font-weight:700;margin-bottom:0.4rem}.included-card p{font-size:0.875rem;color:#555;line-height:1.5}.timetable-list{background:#fff;border:1px solid #e5e7eb;border-radius:10px;overflow:hidden}.timetable-row{display:flex;align-items:center;gap:1.25rem;padding:1rem 1.5rem;border-bottom:1px solid #e5e7eb}.timetable-row:last-child{border-bottom:none}.week-badge{background:var(--blue);color:#fff;font-size:0.75rem;font-weight:700;border-radius:5px;padding:0.25rem 0.6rem;white-space:nowrap;flex-shrink:0}.timetable-row span{font-size:0.95rem}.tutor-card{background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:2rem;display:flex;gap:2rem;align-items:flex-start}.tutor-img{width:120px;flex-shrink:0;border-radius:8px;overflow:hidden;background:#d1d5db;aspect-ratio:3/4;display:flex;align-items:center;justify-content:center;color:#9ca3af;font-size:0.75rem;text-align:center}.tutor-img img{width:100%;height:100%;object-fit:cover;display:block}.tutor-body h3{font-size:1.1rem;font-weight:700;margin-bottom:0.4rem}.tutor-body p{font-size:0.9rem;color:#444;line-height:1.65}.jump-nav{display:flex;flex-wrap:wrap;gap:0.5rem;justify-content:center}.jump-nav a{display:inline-block;background:transparent;border:1.5px solid #4b5563;color:#9ca3af;font-family:'DM Sans', sans-serif;font-size:14px;font-weight:700;padding:7px 16px;border-radius:6px;text-decoration:none;transition:background 0.15s, color 0.15s, border-color 0.15s}.jump-nav a:hover{background:#1e2235;color:#e5e7eb;border-color:#6b7280}.hero-eyebrow{display:inline-block;font-size:0.8rem;font-weight:700;text-transform:uppercase;letter-spacing:0.1em;color:var(--orange);margin-bottom:0.75rem}.contact-form-row{display:grid;grid-template-columns:1fr 1fr;gap:0.75rem}.contact-intro{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:0.5rem;margin-bottom:1.25rem}.contact-intro h3{font-size:1rem;font-weight:700;margin:0}.contact-intro a{color:var(--blue);text-decoration:none;font-size:0.9rem}.contact-intro a:hover{text-decoration:underline}.books-grid{display:grid;grid-template-columns:repeat(auto-fill, minmax(200px, 1fr));gap:1.25rem}.books-grid.single{grid-template-columns:repeat(auto-fill, minmax(220px, 280px))}.books-grid.times-tables{grid-template-columns:repeat(auto-fill, minmax(200px, 1fr))}.book-card{background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:1.5rem 1.25rem 1.25rem;display:flex;flex-direction:column;align-items:center;gap:0.85rem;text-align:center}.book-covers{display:flex;gap:8px;justify-content:center;align-items:flex-end}.book-covers img:first-child{width:100px;height:180px;object-fit:contain;border-radius:4px}.book-covers img:last-child{width:90px;height:160px;object-fit:contain;border-radius:4px}.book-covers img:only-child{width:110px;height:180px;object-fit:contain;border-radius:4px}.cover-placeholder{background:#e5e7eb;border-radius:4px;display:flex;align-items:center;justify-content:center;font-size:11px;color:#6b7280;font-weight:700;text-align:center;line-height:1.3;overflow:hidden}.cover-placeholder.portrait-lg{width:90px;height:130px}.cover-placeholder.portrait-a{width:78px;height:130px}.cover-placeholder.portrait-b{width:72px;height:120px}.book-title{font-size:15px;font-weight:700;color:#1a1a2e}.book-subtitle{font-size:13px;font-weight:300;color:#6b7280;margin-top:-0.5rem}.btn-amazon{display:block;width:100%;text-align:center;background:var(--orange);color:#fff;font-family:'DM Sans', sans-serif;font-size:13px;font-weight:700;text-decoration:none;padding:0.65rem 1.6rem;border-radius:8px;border:none;transition:background 0.15s;margin-top:auto;white-space:nowrap}.btn-amazon:hover{background:var(--orange-dark)}.intro-card{background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:2rem;display:grid;grid-template-columns:120px 1fr;gap:2rem;align-items:start}.photo-placeholder{width:120px;aspect-ratio:3/4;background:#e8edf2;border:2px dashed #c5cdd8;border-radius:8px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:0.5rem;color:#8a96a3;font-size:0.75rem;text-align:center;padding:0.75rem;flex-shrink:0}.photo-placeholder svg{opacity:0.4}.intro-body h2{font-size:1.35rem;font-weight:700;margin-bottom:0.5rem}.intro-body p{font-size:0.95rem;color:#444;margin-bottom:0.85rem;line-height:1.7}.qual-grid{display:grid;grid-template-columns:repeat(3, 1fr);gap:1.25rem}.qual-card{background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:1.5rem}.qual-icon{font-size:1.6rem;margin-bottom:0.6rem;display:block}.qual-card h3{font-size:0.95rem;font-weight:700;margin-bottom:0.3rem}.qual-card p{font-size:0.875rem;color:#555;line-height:1.5}.story-heading{font-size:1.25rem;font-weight:700;margin-bottom:1rem}.story-card{background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:2rem}.story-card p{font-size:0.95rem;color:#444;line-height:1.75;margin-bottom:0.85rem}.story-card p:last-child{margin-bottom:0}.cta-strip{background:var(--blue);border-radius:10px;padding:2rem;text-align:center;color:#fff}.cta-strip h2{font-size:1.25rem;font-weight:700;margin-bottom:0.5rem}.cta-strip p{font-size:0.95rem;color:rgba(255,255,255,0.8);margin-bottom:1.25rem}.btn-white{background:#fff;color:var(--blue);border:2px solid #fff;font-weight:700}.btn-white:hover{background:#e8f0f8;border-color:#e8f0f8}.contact-card-full{background:#fff;border:1px solid #e5e7eb;border-radius:10px;padding:2rem;display:grid;grid-template-columns:1fr 2fr;gap:3rem;align-items:start;margin-bottom:2rem}.contact-left h2{font-size:1.2rem;font-weight:700;margin-bottom:0.5rem}.contact-left p{font-size:0.9rem;color:#555;line-height:1.7;margin-bottom:1.25rem}.btn-submit{background:var(--green);border-color:var(--green);color:#fff;font-family:'DM Sans', sans-serif;font-weight:700;font-size:1rem;padding:0.7rem 1.5rem;border-radius:6px;border:2px solid var(--green);cursor:pointer;transition:background 0.15s, border-color 0.15s;width:100%}.btn-submit:hover{background:var(--green-dark);border-color:var(--green-dark)}.page-hero{background:#0f1120;padding:4rem 2rem 0;text-align:center}.page-hero h1{font-size:46px;font-weight:700;color:#fff;line-height:1.15;margin-bottom:1rem}.page-hero h1 em{font-style:normal;color:var(--orange)}.page-hero p{font-size:17px;font-weight:300;color:#9ca3af;max-width:580px;margin:0 auto 0.6rem;line-height:1.6}@media (max-width: 900px){.overview-card{grid-template-columns:1fr 1fr}.topic-grid{grid-template-columns:repeat(2, 1fr)}.included-grid{grid-template-columns:repeat(2, 1fr)}.qual-grid{grid-template-columns:1fr 1fr}}@media (max-width: 780px){.overview-card{grid-template-columns:1fr}.contact-form-row{grid-template-columns:1fr}.tutor-card{flex-direction:column}.tutor-img{width:100%;aspect-ratio:3/1;height:120px}.contact-card-full{grid-template-columns:1fr;gap:1.5rem}.worksheet-card{flex-direction:row;align-items:flex-start}.wc-image{width:160px;flex-shrink:0;border-right:1px solid #e5e7eb;border-bottom:none}.wc-image.portrait{height:auto}.wc-image.landscape{height:auto}.wc-image.landscape img{max-height:160px;width:100%;object-fit:contain}.wc-content{flex:1;min-width:0}.wc-actions{flex-direction:column;width:auto;min-width:140px}}@media (max-width: 640px){.om-strip{flex-direction:column}.om-strip-item{flex-direction:column;align-items:flex-start;text-align:left;border-right:none;border-bottom:1px solid #e5e7eb;border-top:none;border-left:3px solid var(--sc);padding:0.75rem 1.25rem;gap:2px}.om-strip-item:last-child{border-bottom:none}.om-strip-title{font-size:14px}.om-strip-sub{font-size:12px;margin-top:2px}}@media (max-width: 600px){.topic-grid{grid-template-columns:1fr}.included-grid{grid-template-columns:1fr}.qual-grid{grid-template-columns:1fr}.intro-card{grid-template-columns:1fr}.photo-placeholder{width:100%;height:120px;aspect-ratio:unset}.page-hero{padding:3rem 1.5rem 0}.page-hero h1{font-size:28px}.page-hero p{font-size:15px}.quiz-question{font-size:28px}.results-score{font-size:48px}.results-actions{flex-direction:column}.results-btn{min-width:0;width:100%}.setup-card,.quiz-card,.results-card{padding:1.25rem}.books-grid,.books-grid.times-tables{grid-template-columns:1fr 1fr}.books-grid.single{grid-template-columns:1fr}.worksheet-page .worksheet-card{flex-direction:column}.wc-image{width:100%;border-right:none;border-bottom:1px solid #e5e7eb;align-self:center;max-width:260px;margin:0 auto}.wc-image.portrait{height:200px;max-height:200px;align-self:center}.wc-image.portrait img{max-height:200px;width:100%;object-fit:contain}.wc-image.landscape{height:140px}.worksheet-page .wc-actions{padding:0 16px 16px;flex-direction:column;gap:6px}.worksheet-page .wc-actions .btn{width:100%;justify-content:center}}@media (max-width: 400px){.books-grid,.books-grid.times-tables{grid-template-columns:1fr}}.back-to-top{position:fixed;bottom:2rem;right:2rem;width:44px;height:44px;border-radius:50%;background:#111;color:#fff;border:none;font-size:1.25rem;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 2px 8px rgba(0,0,0,0.18);opacity:0;pointer-events:none;transition:opacity 0.2s ease;z-index:999}.back-to-top.visible{opacity:1;pointer-events:auto}.back-to-top:hover{filter:brightness(0.9)}@media (max-width: 600px){.back-to-top{width:40px;height:40px;font-size:1.1rem;bottom:1rem;right:1rem}}