:root{--navy:#142b40;--navy-deep:#102335;--teal:#126e67;--teal-dark:#0c5651;--teal-tint:#edf6f3;--amber:#e2aa44;--amber-ink:#795316;--amber-tint:#fff8e9;--paper:#f7f9f8;--white:#fff;--ink:#253c4c;--muted:#596b75;--line:#dce5e3;--soft-line:#e9eeec;--radius:18px;--shadow:0 10px 34px -19px rgba(20,43,64,.22)}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;color:var(--navy);background:var(--paper);font-family:Inter,"Segoe UI",Arial,sans-serif;font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default}a{color:inherit}button{color:inherit}svg{display:block}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.2}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--teal);outline-offset:4px}button:hover,a:hover{text-decoration:none}[hidden]{display:none!important}.container{width:min(1168px,calc(100% - 80px));margin-inline:auto}.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;left:20px;top:-80px;z-index:100;background:var(--navy);color:#fff;padding:12px 18px;border-radius:8px}.skip-link:focus{top:15px}.site-header{background:var(--white);border-bottom:1px solid var(--line)}.header-inner{height:94px;display:flex;align-items:center;gap:48px}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;flex-shrink:0}.brand-mark{display:grid;place-items:center;background:var(--teal);color:var(--white);width:46px;height:46px;border-radius:12px}.brand-mark svg{width:35px;height:35px}.brand-text{font-size:17px;font-weight:800;letter-spacing:1.7px;line-height:1.2}.brand-text span{display:block;font-size:10px;letter-spacing:4px;margin-top:5px;font-weight:650;color:var(--muted)}.header-nav{display:flex;align-items:center;gap:30px;height:100%;margin-left:8px}.header-nav a{font-size:13px;font-weight:650;text-decoration:none;height:100%;display:flex;align-items:center;position:relative}.nav-current:after{position:absolute;bottom:0;left:0;right:0;content:"";height:3px;background:var(--teal);border-radius:4px 4px 0 0}.nav-help{border:0;background:none;padding:12px 0;font-size:13px;color:var(--muted);display:flex;gap:8px;align-items:center}.nav-help:hover{color:var(--teal)}.header-label{font-size:11px;display:flex;align-items:center;gap:8px;margin-left:auto;white-space:nowrap;color:var(--muted)}.tiny-dot{width:6px;height:6px;border-radius:50%;background:var(--teal)}.hero{padding:55px 0 39px;display:grid;grid-template-columns:1.65fr 1fr;gap:44px;align-items:center}.eyebrow{font-size:10px;font-weight:750;letter-spacing:2px;display:flex;align-items:center;gap:10px;color:var(--teal)}.eyebrow-line{width:24px;height:2px;background:var(--amber)}h1{font-size:clamp(36px,4.1vw,53px);letter-spacing:-2.1px;line-height:1.15;font-weight:750;margin-top:17px}h1 span{color:var(--teal)}.hero-description{font-size:15px;color:var(--muted);margin-top:18px;line-height:1.8}.hero-aside{padding:22px 0 20px 32px;border-left:1px solid var(--line);max-width:340px;justify-self:end}.companion-note{font-size:12px;display:flex;align-items:center;gap:9px;color:var(--muted);white-space:nowrap}.spark-icon{color:var(--amber-ink);font-size:28px;line-height:1}.catalogue-metrics{display:flex;gap:43px;margin:19px 0 16px}.catalogue-metrics div+div{border-left:1px solid var(--line);padding-left:36px}.catalogue-metrics strong{font-size:39px;line-height:1;font-weight:650;letter-spacing:-1px;display:block}.catalogue-metrics span{color:var(--muted);font-size:12px;display:block;margin-top:7px}.hero-aside>p{color:var(--muted);font-size:11px}.finder-panel{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:27px 30px 0;position:relative;scroll-margin-top:20px}.finder-panel:before{content:"";position:absolute;left:29px;top:-1px;width:62px;height:3px;background:var(--teal);border-radius:0 0 4px 4px}.finder-panel:focus{outline:none}.finder-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:25px}.finder-heading-copy{display:flex;align-items:center;gap:13px}.section-icon{width:42px;height:42px;display:grid;place-items:center;background:var(--teal-tint);color:var(--teal);border-radius:11px}.section-icon svg{width:22px;height:22px}.finder-heading h2{font-size:21px;font-weight:700;letter-spacing:-.45px}.finder-heading p{font-size:12px;color:var(--muted);margin-top:4px}.reset-button{background:none;border:0;display:flex;align-items:center;gap:7px;padding:10px 2px;font-size:12px;font-weight:600;color:var(--teal);min-height:44px}.reset-button svg{width:16px;height:16px}.reset-button:disabled{color:#78858c}.reset-button:hover:not(:disabled){color:var(--navy)}.filter-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:23px}.filter-field label{display:flex;align-items:center;gap:7px;font-size:12px;font-weight:700;margin-bottom:10px}.step-number{width:19px;height:19px;border-radius:50%;border:1px solid var(--line);font-size:10px;font-weight:650;display:grid;place-items:center;color:var(--muted);background:var(--white)}.step-number.active{color:var(--teal);border-color:#bdd9d2;background:var(--teal-tint)}.step-number.complete{color:var(--white);background:var(--teal);border-color:var(--teal)}.select-wrap{position:relative}.select-wrap>svg{pointer-events:none;position:absolute;right:16px;top:22px;width:13px;height:13px;fill:none;stroke:var(--muted);stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}select{width:100%;height:55px;padding:0 39px 0 15px;color:var(--navy);background:var(--white);border:1px solid #cbd8d4;border-radius:9px;appearance:none;font-size:13px;cursor:pointer;transition:border-color .15s}select:hover:not(:disabled){border-color:var(--teal)}select:disabled{color:#728089;background:#f1f4f3;border-color:#e1e7e4;cursor:not-allowed;opacity:1;-webkit-text-fill-color:#728089}.field-hint{font-size:11px;color:var(--muted);display:block;margin-top:8px}.search-row{border-top:1px solid var(--soft-line);margin-top:24px;display:flex;align-items:center;gap:18px;padding:17px 0 18px}.search-row>label{font-size:11px;color:var(--muted);white-space:nowrap}.search-input-wrap{position:relative;flex:1;max-width:510px}.search-input-wrap>svg{position:absolute;left:13px;top:13px;width:18px;height:18px;color:var(--muted);pointer-events:none}.search-input-wrap input{width:100%;height:44px;border:1px solid transparent;border-radius:8px;background:#f3f6f5;padding:0 42px 0 40px;font-size:12px;color:var(--navy)}.search-input-wrap input::placeholder{color:var(--muted);opacity:1}.search-input-wrap input::-webkit-search-cancel-button{display:none}.search-input-wrap input:focus{background:var(--white);border-color:var(--teal)}#clear-search{background:none;border:0;border-radius:7px;position:absolute;right:0;top:0;height:44px;width:40px;color:var(--muted);font-size:21px}.search-hint{font-size:10px;color:var(--muted);margin-left:auto}.results-section{margin-top:35px;min-height:208px}.results-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:16px}.eyebrow.small{font-size:9px;letter-spacing:1.6px}.results-heading h2{font-size:24px;font-weight:700;letter-spacing:-.6px;margin-top:7px}.results-count{font-size:11px;color:var(--muted);background:#edf2f0;border:1px solid #e0e7e3;border-radius:6px;padding:5px 10px;white-space:nowrap}.results-description{color:var(--muted);font-size:12px;margin-top:8px;margin-bottom:19px}.series-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:13px}.series-card{background:var(--white);text-align:left;border:1px solid var(--line);border-radius:12px;padding:18px 16px 15px;min-height:148px;position:relative;transition:transform .16s,border-color .16s,box-shadow .16s;display:flex;flex-direction:column}.series-card:hover{border-color:#82b4a8;box-shadow:0 6px 18px -12px rgba(20,43,64,.35);transform:translateY(-2px)}.series-card .series-icon{color:var(--teal);width:27px;height:27px;margin-bottom:13px}.series-card .series-name{font-size:14px;font-weight:700;letter-spacing:-.2px}.series-card .series-range{font-size:10px;color:var(--muted);margin-top:4px;line-height:1.5}.series-card .series-bottom{display:flex;justify-content:space-between;align-items:center;gap:5px;margin-top:auto;padding-top:14px;font-size:10px;color:var(--muted)}.series-card .series-bottom svg{width:14px;height:14px;color:var(--teal)}.book-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.book-card{background:var(--white);border:1px solid var(--line);border-radius:14px;padding:22px;display:flex;flex-direction:column;min-height:285px;box-shadow:0 6px 20px -17px rgba(20,43,64,.2);transition:border-color .15s,transform .15s}.book-card:hover{border-color:#a3c8be;transform:translateY(-2px)}.book-card-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:21px}.subject-icon{height:42px;width:42px;background:var(--teal-tint);color:var(--teal);border-radius:11px;display:grid;place-items:center}.subject-icon svg{width:23px;height:23px}.class-tag{padding:5px 9px;background:#f1f4f5;border-radius:6px;font-size:10px;font-weight:650;color:var(--navy)}.book-series{font-size:9px;letter-spacing:1.4px;text-transform:uppercase;font-weight:750;color:var(--teal);margin-bottom:8px}.book-card h3{font-size:22px;line-height:1.2;letter-spacing:-.55px}.book-meta{display:flex;flex-wrap:wrap;gap:4px 8px;font-size:11px;color:var(--muted);margin-top:9px}.shared-note{font-size:10px;color:var(--muted);margin-top:10px;line-height:1.6}.book-card-bottom{margin-top:auto;padding-top:20px}.open-button,.primary-button{display:flex;align-items:center;justify-content:space-between;gap:13px;text-decoration:none;border:0;border-radius:8px;background:var(--teal);color:var(--white);font-size:12px;font-weight:650;min-height:44px;padding:12px 15px;transition:background .15s}.open-button:hover,.primary-button:hover{background:var(--teal-dark)}.open-button svg{width:16px;height:16px}.book-link-note{font-size:9px;color:var(--muted);text-align:center;margin-top:8px}.step-panel{border:1px dashed #c2d3cd;background:#f0f6f3;border-radius:12px;padding:24px;display:flex;align-items:center;gap:19px;grid-column:1/-1}.step-panel .panel-icon{width:44px;height:44px;border:1px solid #cde1d8;border-radius:12px;display:grid;place-items:center;color:var(--teal);background:var(--white);flex-shrink:0}.step-panel .panel-icon svg{width:22px;height:22px}.step-panel h3{font-size:16px;letter-spacing:-.25px}.step-panel p{font-size:12px;color:var(--muted);margin-top:5px}.choice-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:15px}.choice-chip{padding:9px 13px;min-height:40px;border:1px solid #c4d8d0;background:var(--white);border-radius:7px;font-size:11px;color:var(--teal);font-weight:600}.choice-chip:hover{background:var(--teal);color:var(--white);border-color:var(--teal)}.empty-state{grid-column:1/-1;text-align:center;background:var(--white);border:1px solid var(--line);border-radius:12px;padding:34px 20px}.empty-state svg{width:30px;height:30px;margin:0 auto 13px;color:var(--teal)}.empty-state h3{font-size:19px}.empty-state p{font-size:12px;color:var(--muted);margin:9px 0 17px}.empty-state button{margin:0 auto}.review-notice{background:var(--amber-tint);border:1px solid #ebd4a6;color:var(--amber-ink);padding:13px 16px;border-radius:8px;font-size:12px;margin-top:15px}.learning-note{display:flex;align-items:center;gap:13px;margin-top:30px;padding:17px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.note-icon{width:26px;color:var(--amber-ink);flex-shrink:0}.note-icon svg{width:24px;height:24px}.learning-note p{font-size:10px;color:var(--muted);max-width:660px;line-height:1.8}.learning-note strong{font-weight:650;color:var(--ink)}.note-divider{height:30px;width:1px;background:var(--line);margin-left:auto}.notebook-label{display:flex;align-items:center;gap:8px;font-size:10px;white-space:nowrap;color:var(--muted);padding-left:10px}.notebook-label svg{width:13px;height:13px}.availability-details{margin-top:10px}.availability-details summary{list-style:none;display:flex;align-items:center;justify-content:space-between;cursor:pointer;min-height:48px;color:var(--muted);font-size:11px;font-weight:600;padding:10px 0}.availability-details summary::-webkit-details-marker{display:none}.details-plus{font-size:19px;color:var(--teal);font-weight:400}.availability-details[open] .details-plus{transform:rotate(45deg)}.availability-content{border:1px solid var(--line);background:var(--white);border-radius:10px;padding:20px 23px;font-size:12px;color:var(--muted)}.availability-content h3{color:var(--navy);font-size:13px;margin:16px 0 8px}.availability-content ul{padding-left:19px;margin:8px 0 12px}.availability-content li{margin:5px 0}.small-print{font-size:10px;line-height:1.7}.site-footer{margin-top:28px;border-top:1px solid var(--line)}.footer-inner{display:flex;align-items:center;justify-content:space-between;min-height:69px;gap:20px;font-size:10px;color:var(--muted)}.footer-inner span{color:#8c989d;padding:0 9px}.error-box{padding:16px;border:1px solid #e5c788;background:var(--amber-tint);color:var(--amber-ink);border-radius:8px;margin-bottom:20px}dialog{border:1px solid var(--line);border-radius:20px;padding:30px;max-width:510px;width:calc(100% - 32px);color:var(--navy);box-shadow:0 24px 90px rgba(20,43,64,.3)}dialog::backdrop{background:rgba(16,35,53,.5);backdrop-filter:blur(3px)}.dialog-top{display:flex;align-items:center;gap:12px;justify-content:space-between}#close-help{background:#eff4f2;border:0;border-radius:50%;width:36px;height:36px;font-size:23px;color:var(--muted);flex-shrink:0}dialog h2{font-size:27px;letter-spacing:-.8px;margin-top:13px;max-width:360px}.help-steps{padding-left:25px;margin:25px 0}.help-steps li{padding-left:6px;margin-top:17px;font-size:13px}.help-steps li::marker{color:var(--teal);font-weight:700}.help-steps p{color:var(--muted);font-size:12px;margin-top:4px}.help-access{background:var(--teal-tint);border-radius:10px;padding:16px;font-size:12px}.help-access p{color:var(--muted);font-size:11px;margin-top:5px}.primary-button{margin-top:20px;width:100%;font-size:13px}
@media(min-width:1500px){.hero{padding-top:65px;padding-bottom:45px}.container{width:1168px}}
@media(max-width:1050px){.container{width:calc(100% - 48px)}.header-inner{gap:26px}.header-label{display:none}.header-nav{margin-left:auto}.hero{gap:24px;grid-template-columns:1.5fr 1fr}.hero-aside{padding-left:24px}.companion-note{white-space:normal}.series-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.search-hint{display:none}.search-input-wrap{max-width:none}.book-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.notebook-label{display:none}.note-divider{display:none}}
@media(max-width:720px){.container{width:calc(100% - 36px)}.header-inner{height:77px}.brand-mark{width:39px;height:39px;border-radius:10px}.brand-mark svg{width:29px;height:29px}.brand-text{font-size:14px;letter-spacing:1.4px}.brand-text span{font-size:8px;letter-spacing:3.3px}.header-nav{gap:0}.header-nav .nav-current{display:none}.nav-help{font-size:11px;gap:5px}.hero{padding:32px 0 27px;display:block}.eyebrow{font-size:8px;letter-spacing:1.5px}h1{font-size:38px;letter-spacing:-1.5px;margin-top:14px}.hero-description{font-size:13px;margin-top:13px;line-height:1.7}.hero-aside{border-left:0;padding:0;margin-top:18px;display:flex;align-items:center;gap:14px;max-width:none}.companion-note,.hero-aside>p{display:none}.catalogue-metrics{margin:0;gap:16px;display:flex}.catalogue-metrics div{display:flex;align-items:baseline;gap:6px}.catalogue-metrics div+div{padding-left:16px}.catalogue-metrics strong{font-size:17px;letter-spacing:0}.catalogue-metrics span{font-size:10px;margin:0}.finder-panel{padding:21px 19px 0;border-radius:14px}.finder-panel:before{left:19px}.finder-heading{margin-bottom:22px;align-items:flex-start}.finder-heading-copy{gap:10px}.section-icon{width:35px;height:35px;border-radius:9px;flex-shrink:0}.section-icon svg{width:20px;height:20px}.finder-heading h2{font-size:17px;letter-spacing:-.4px}.finder-heading p{font-size:10px;max-width:170px;line-height:1.5}.reset-button{font-size:10px;gap:4px;padding:1px 0 5px;min-height:34px;white-space:nowrap}.reset-button svg{width:13px}.filter-grid{grid-template-columns:1fr;gap:17px}.filter-field label{font-size:11px;margin-bottom:8px}.field-hint{display:none}select{height:50px;font-size:13px}.select-wrap>svg{top:19px}.search-row{display:block;margin-top:21px;padding:15px 0 18px}.search-row>label{display:block;font-size:10px;margin-bottom:8px}.search-input-wrap input{height:46px;font-size:12px}.search-input-wrap>svg{top:14px}#clear-search{height:46px}.results-section{margin-top:28px;min-height:0}.results-heading{gap:10px}.results-heading h2{font-size:22px;margin-top:6px}.results-count{font-size:9px;padding:4px 7px}.results-description{font-size:11px;line-height:1.7;max-width:330px}.series-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:11px}.series-card{min-height:147px;padding:16px 14px 13px}.series-card .series-name{font-size:13px}.series-card .series-range{font-size:10px}.series-card .series-icon{width:25px;height:25px;margin-bottom:12px}.series-card .series-bottom{font-size:9px;padding-top:12px}.book-grid{grid-template-columns:1fr;gap:14px}.book-card{padding:20px;min-height:267px}.book-card h3{font-size:23px}.book-card-top{margin-bottom:18px}.book-link-note{font-size:10px}.book-series{font-size:10px}.book-meta{font-size:12px}.shared-note{font-size:11px}.open-button{min-height:48px;font-size:13px}.learning-note{margin-top:26px;align-items:flex-start;gap:10px;padding:16px 0}.learning-note p{font-size:10px}.learning-note strong{display:block}.note-icon{width:22px;margin-top:2px}.step-panel{padding:19px 16px;align-items:flex-start;gap:12px}.step-panel h3{font-size:15px}.step-panel p{font-size:11px}.step-panel .panel-icon{width:33px;height:33px;border-radius:8px}.step-panel .panel-icon svg{width:18px;height:18px}.choice-chip{font-size:11px;padding:9px 10px;min-height:40px}.footer-inner{min-height:75px;align-items:flex-start;justify-content:center;flex-direction:column;gap:5px;font-size:9px;padding:17px 0}.site-footer{margin-top:15px}.availability-content{padding:16px;font-size:11px}.availability-details summary{font-size:11px}.review-notice{font-size:11px}dialog{padding:23px}dialog h2{font-size:25px}.desktop-break{display:none}}
@media(max-width:360px){.container{width:calc(100% - 28px)}.brand{gap:8px}.brand-text{font-size:12px;letter-spacing:1px}.brand-text span{letter-spacing:2.5px}.brand-mark{width:35px;height:35px}.nav-help{font-size:10px}h1{font-size:33px}.finder-panel{padding-inline:15px}.finder-heading-copy{gap:8px}.finder-heading .section-icon{display:none}.finder-heading h2{font-size:16px}.results-count{font-size:8px}.series-card{padding:14px 11px}.series-card .series-name{font-size:12px}.hero-description{font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}.series-card:hover,.book-card:hover{transform:none}}
@media print{.site-header,.hero,.finder-panel,.availability-details,.learning-note,.site-footer{display:none}.container{width:100%}.book-grid{grid-template-columns:repeat(2,1fr)}.book-card{break-inside:avoid}.open-button{color:#142b40;background:none;border:1px solid #142b40}.book-card a:after{content:attr(href);font-size:8px;word-break:break-all}.results-section{margin:0}}

/* Direct subject launch: keep the navigation warning visible on every screen. */
#subject-hint{display:block;font-size:11px;line-height:1.6;color:var(--teal);margin-top:8px}
#search-results-section[hidden]{display:none!important}
#launch-error{margin-top:0}
.finder-panel>.review-notice{margin:0 0 20px}
.help-search{font-size:12px;line-height:1.7;color:var(--muted);margin-bottom:16px}