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a[aria-current]{background:var(--green);color:#fff;transform:translateY(0)}.tab-label{font-family:var(--serif);font-size:1.15rem;font-weight:600;line-height:1.1}.tab-count{color:var(--muted);font-size:.78rem}.grade-tabs a[aria-current] .tab-count{color:#dfe8e2}.cover{aspect-ratio:17/22;background:var(--card);border:1px solid var(--line);box-shadow:0 1px 0 var(--line), 0 6px 14px -10px #23302a59;border-radius:6px;overflow:hidden}.cover img{object-fit:cover;object-position:top;width:100%;height:100%}.cover-placeholder{--tone:#9bb08f;--wash:#e7eee2;background:var(--wash);place-items:center;display:grid;position:relative}.tone-sky{--tone:#84a7b1;--wash:#e1ecef}.tone-butter{--tone:#c3a649;--wash:#f2edd6}.tone-peach{--tone:#c79069;--wash:#f4e7da}.tone-rose{--tone:#be8a96;--wash:#f2e4e7}.tone-lavender{--tone:#a093c0;--wash:#e9e5f2}.tone-sage{--tone:#8aa37e;--wash:#e7eee2}.sheet{background:#fffefb;border-radius:3px;width:72%;height:80%;position:absolute;box-shadow:0 2px 8px #23302a1f}.sheet-back{opacity:.8;transform:rotate(5deg)translate(4%,2%)}.sheet-front{flex-direction:column;gap:8px;padding:12% 10%;display:flex;transform:rotate(-3deg)}.sheet-subject{color:var(--tone);font-size:.7rem;font-weight:700}.sheet-title{font-family:var(--serif);color:var(--ink);font-size:clamp(.8rem,.7rem + .5vw,1.05rem);line-height:1.2}.sheet-lines{gap:7px;margin-top:auto;display:grid}.sheet-lines i{background:var(--wash);height:2px;display:block}.sheet-lines i:last-child{width:60%}.sheet-type{color:var(--muted);font-size:.68rem}.resource-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 18px;display:grid}@media (min-width:760px){.resource-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:36px 24px}}@media (min-width:1100px){.resource-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}.resource-card{flex-direction:column;min-width:0;display:flex}.card-cover-link{display:block}.card-cover-link .cover{transition:transform .2s}.card-cover-link:hover .cover{transform:translateY(-3px)}.card-body{gap:4px;padding-top:12px;display:grid}.card-title-row{justify-content:space-between;align-items:flex-start;gap:6px;display:flex}.card-title{font-size:1.02rem;line-height:1.3;font-family:var(--sans);font-weight:700}.card-title a{text-decoration:none}.card-title a:hover{text-underline-offset:3px;text-decoration:underline}.card-meta{color:var(--muted);font-size:.9rem}.card-footer{flex-wrap:wrap;align-items:center;gap:8px;margin-top:4px;display:flex}.save-button{width:44px;height:44px;color:var(--muted);background:0 0;border:0;border-radius:50%;flex-shrink:0;place-items:center;margin:-10px -10px 0 0;display:grid}.save-button:hover{color:var(--green);background:var(--sage)}.save-button.saved{color:#b5485a}.save-button:disabled{opacity:.4}.price-tag{flex-wrap:wrap;align-items:baseline;gap:6px;display:inline-flex}.price-tag del{color:var(--muted);font-size:.92rem;text-decoration-thickness:1.5px}.price-tag strong{color:var(--green);font-size:1rem}.price-tag.large strong{font-family:var(--serif);font-size:1.9rem;font-weight:600;line-height:1}.price-tag.large del{font-size:1.15rem}.price-note{color:var(--body);background:var(--pencil-soft);border-radius:6px;flex-basis:auto;width:fit-content;padding:2px 8px;font-size:.88rem}.hero{align-items:center;gap:32px;padding:24px 0 40px;display:grid}@media (min-width:900px){.hero{grid-template-columns:1.25fr 1fr;padding:48px 0 56px}}.hero-copy{gap:18px;display:grid}.hero h1{max-width:16ch}.hero-copy>p{color:var(--body);max-width:50ch;font-size:1.12rem}.hero-points{color:var(--body);flex-wrap:wrap;gap:8px 20px;display:flex}.hero-points li{align-items:center;gap:6px;display:inline-flex}.hero-points svg{color:var(--green)}.hero-stack{height:340px;display:none;position:relative}@media (min-width:900px){.hero-stack{display:block}}.stack-sheet{width:220px;position:absolute}.stack-0{z-index:3;top:0;left:34%;transform:rotate(-4deg)}.stack-1{z-index:2;top:46px;left:6%;transform:rotate(-11deg)}.stack-2{z-index:1;top:58px;left:60%;transform:rotate(7deg)}.home-section{gap:18px;padding:28px 0;display:grid}.home-section>*,.hero-copy>*,.landing>*,.detail-layout>*,.search-layout>*{min-width:0}.home-section>h2,.results-heading h2{font-size:clamp(1.35rem,1.1rem + .8vw,1.75rem)}.results-heading{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:12px;display:flex}.subject-list{grid-template-columns:1fr;gap:12px;display:grid}@media (min-width:700px){.subject-list{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (min-width:1000px){.subject-list{grid-template-columns:repeat(3,minmax(0,1fr))}}.subject-list a{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);gap:4px;height:100%;padding:16px 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(min-width:900px){.results-toolbar{display:flex}}.sort-inline{color:var(--muted);align-items:center;gap:8px;display:inline-flex}.sort-inline select{border:1px solid var(--line-strong);background:var(--card);min-height:40px;color:var(--ink);border-radius:8px;padding:6px 10px}.pagination{border-top:1px solid var(--line);color:var(--muted);justify-content:space-between;align-items:center;margin-top:36px;padding-top:18px;display:flex}.loading-bar{z-index:50;background:linear-gradient(90deg, transparent, var(--pencil), transparent);background-repeat:no-repeat;background-size:40% 100%;height:3px;animation:1s linear infinite slide;position:fixed;top:0;left:0;right:0}@keyframes slide{0%{background-position:-40% 0}to{background-position:140% 0}}.detail-layout{grid-template-columns:1fr;gap:24px;display:grid}@media (min-width:900px){.detail-layout{grid-template-columns:minmax(0,1fr) minmax(0,1.1fr) 300px;align-items:start;gap:36px}.detail-aside{position:sticky;top:84px}}@media (min-width:640px) and (max-width:899px){.detail-layout{grid-template-columns:minmax(0,.9fr) minmax(0,1fr)}.detail-aside{grid-column:1/-1}}.gallery{gap:10px;display:grid}@media (max-width:639px){.detail-gallery .gallery{max-width:62%;margin:0 auto}.detail-gallery .gallery-caption{text-align:center}.breadcrumbs li:last-child{display:none}.breadcrumbs li:nth-last-child(2) svg+a,.breadcrumbs li:nth-last-child(2) a{font-weight:700}}.gallery-stage{cursor:zoom-in;background:0 0;border:0;padding:0;position:relative}.gallery-stage img{border:1px solid var(--line);background:#fff;border-radius:6px;width:100%;height:auto;box-shadow:0 8px 22px -14px #23302a73}.gallery-zoom{color:var(--green);background:#ffffffeb;border-radius:999px;align-items:center;gap:6px;padding:5px 10px;font-size:.85rem;font-weight:700;display:inline-flex;position:absolute;bottom:10px;right:10px}.gallery-thumbs{gap:8px;padding-bottom:2px;display:flex;overflow-x:auto}.gallery-thumbs button{background:0 0;border:2px solid #0000;border-radius:5px;flex-shrink:0;width:62px;padding:0}.gallery-thumbs button[aria-pressed=true]{border-color:var(--green)}.gallery-thumbs img{aspect-ratio:17/22;object-fit:cover;object-position:top;border-radius:3px}.gallery-caption{color:var(--muted);font-size:.88rem}.detail-title-row h1{font-size:clamp(1.7rem,1.3rem + 1.4vw,2.3rem);line-height:1.15}.detail-title-row{justify-content:space-between;align-items:flex-start;gap:8px;display:flex}.detail-title-row .save-button{margin:0 -8px 0 0}.detail-kicker{color:var(--muted);margin-top:6px}.detail-kicker a{color:var(--green);font-weight:700}.detail-summary{color:var(--body);max-width:60ch;margin-top:14px;font-size:1.12rem}.detail-facts{gap:8px;margin-top:18px;display:grid}.detail-facts li{color:var(--body);align-items:center;gap:10px;display:flex}.detail-facts svg{color:var(--green)}.detail-section{margin-top:26px}.detail-section h2{margin-bottom:10px;font-size:1.3rem}.detail-section.prose h2{margin-top:0}.check-list{gap:8px;display:grid}.check-list li{color:var(--body);align-items:flex-start;gap:10px;display:flex}.check-list svg{color:var(--green);flex-shrink:0;margin-top:4px}.detail-more{border-top:1px solid var(--line);gap:4px;max-width:760px;margin-top:18px;padding-top:10px;display:grid}.attribution p{color:var(--body)}.related{gap:18px;margin-top:48px;display:grid}.access-box{background:var(--card);border:1px solid var(--line-strong);border-radius:14px;gap:14px;padding:20px;display:grid;box-shadow:0 10px 30px -22px #23302a80}.access-formats{gap:6px;display:grid}.access-formats li{color:var(--body);align-items:center;gap:8px;display:flex}.access-note,.access-status{color:var(--muted);align-items:center;gap:6px;font-size:.92rem;display:flex}.access-status{color:var(--green)}.access-status a{color:var(--green);font-weight:700}.mobile-buy-bar{display:none}@media (max-width:899px){.mobile-buy-bar{z-index:25;padding:10px var(--gutter) calc(10px + env(safe-area-inset-bottom));border-top:1px solid var(--line-strong);background:#fffffff7;align-items:center;gap:14px;display:flex;position:fixed;bottom:0;left:0;right:0}.mobile-buy-bar .button{flex:1}.detail{padding-bottom:110px}}.modal{max-height:calc(100dvh - 32px);width:min(460px, calc(100vw - 2 * var(--gutter)));background:var(--card);color:var(--ink);border:0;border-radius:16px;margin:auto;padding:28px 24px 24px;overflow-y:auto;box-shadow:0 30px 80px -30px #141e198c}.modal::backdrop{background:#1c262173}.modal-close{width:40px;height:40px;color:var(--muted);background:0 0;border:0;border-radius:50%;place-items:center;display:grid;position:absolute;top:10px;right:10px}.modal-close:hover{background:var(--sage)}.modal-close.static{position:static}.preview-modal{width:min(820px, calc(100vw - 2 * var(--gutter)));padding:52px 16px 16px}.preview-large{object-fit:contain;width:100%;height:auto;max-height:78vh}.preview-nav{color:var(--muted);justify-content:space-between;align-items:center;margin-top:12px;display:flex}.filter-drawer{border-radius:0;flex-direction:column;width:min(420px,100vw);height:100dvh;max-height:100dvh;margin:0 0 0 auto;padding:0;display:none;overflow:hidden}.filter-drawer[open]{display:flex}.filter-drawer header,.filter-drawer footer{padding:14px var(--gutter);border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;display:flex}.filter-drawer header h2{font-size:1.3rem}.filter-drawer footer{border-top:1px solid var(--line);border-bottom:0;gap:12px;margin-top:auto}.filter-drawer footer .button{flex:1}.drawer-body{padding:18px var(--gutter);overflow-y:auto}.sign-in-form{gap:10px;display:grid}.sign-in-form h1,.sign-in-form h2{padding-right:32px;font-size:1.6rem}.sign-in-form>p{color:var(--body)}.sign-in-form .check-row{margin:8px 0 6px}.form-resource{font-weight:700;color:var(--green)!important}.form-note{font-size:.88rem;color:var(--muted)!important}.form-note a{color:var(--green)}.form-error{background:var(--danger-soft);border-radius:8px;padding:8px 12px;font-size:.95rem;color:var(--danger)!important}.form-error.banner{margin-bottom:18px}.form-or{text-align:center;font-size:.9rem;color:var(--muted)!important}.form-secondary{flex-wrap:wrap;justify-content:space-between;gap:12px;display:flex}.code-form{background:var(--paper);border-radius:10px;gap:8px;margin-top:8px;padding:14px;display:grid}.code-form label{color:var(--body);font-size:.95rem}.code-row{gap:8px;display:flex}.code-row input{letter-spacing:.25em;text-align:center;max-width:180px;font-size:1.2rem}.sign-in-page .sign-in-form,.confirm-page .sign-in-form,.account.narrow .sign-in-form{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:28px 24px}.account-header{gap:4px;margin:8px 0 12px;display:grid}.account-header p{color:var(--muted)}.account-section{border-top:1px solid var(--line);justify-items:start;gap:14px;padding:26px 0;display:grid}.account-section>.resource-grid,.account-section>.preferences{justify-self:stretch}.account-section:first-of-type{border-top:0}.section-note,.empty-line{color:var(--body)}.preferences{gap:18px;max-width:640px;display:grid}.preferences fieldset{border:0;margin:0;padding:0}.preferences legend{margin-bottom:8px;font-weight:700}.check-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px 16px;display:grid}.form-actions{align-items:center;gap:14px;display:flex}.error-page{gap:16px;display:grid}.legal h2{font-size:1.3rem}.legal-date{margin:6px 0 18px;color:var(--muted)!important}.prose>:first-child{margin-top:0}.prose p+ul,.prose p+ol,.prose ul+p,.prose ol+p{margin-top:.8em}.prose ol{gap:.3em;padding-left:1.4em;list-style:decimal;display:grid}.prose strong{color:var(--ink)}.prose blockquote{border-left:3px solid var(--pencil);background:var(--pencil-soft);border-radius:0 8px 8px 0;margin:1em 0;padding:8px 16px}.prose img{border:1px solid var(--line);border-radius:8px;height:auto;margin:1em 0}.prose table{border-collapse:collapse;margin:1em 0;font-size:.95rem;display:block;overflow-x:auto}.prose th,.prose td{border:1px solid var(--line);text-align:left;padding:6px 10px}.prose th{background:var(--sage)}.prose hr{border:0;border-top:1px solid var(--line);margin:1.5em 0}.landing-intro p{font-size:1.08rem}.detail-section>h2+.prose{margin-top:0}.badge.soon{background:var(--pencil-soft);color:#5d4a12;width:fit-content}.access-box>.badge.soon{font-size:.85rem}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}