@font-face{font-family:"DM Sans";src:url("assets/fonts/dm-sans-latin.woff2") format("woff2");font-style:normal;font-weight:100 1000;font-display:swap}
@font-face{font-family:"DM Sans";src:url("assets/fonts/dm-sans-latin-ext.woff2") format("woff2");font-style:normal;font-weight:100 1000;font-display:swap;unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C4,U+2113,U+2C60-2C7F,U+A720-A7FF}
:root{font-family:"DM Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color-scheme:dark;--page:#18191c;--surface:#202124;--surface-raised:#242629;--surface-hover:#2a2d31;--surface-selected:#26364f;--text:#f2f2f1;--muted:#a9abb2;--subtle:#777b84;--line:#34373c;--accent:#669eff;--accent-soft:rgba(102,158,255,.13);--green:#36c995;--shadow:0 16px 48px rgba(0,0,0,.18);--radius:1.15rem;scroll-behavior:smooth}
:root[data-theme="light"]{color-scheme:light;--page:#f5f6f8;--surface:#fff;--surface-raised:#f8f9fb;--surface-hover:#eff1f4;--surface-selected:#eaf1ff;--text:#17191d;--muted:#636771;--subtle:#777e88;--line:#e1e4e9;--accent:#2563eb;--accent-soft:rgba(37,99,235,.09);--green:#14895f;--shadow:0 16px 48px rgba(25,35,55,.08)}
*{box-sizing:border-box}html{scroll-padding-top:6.5rem}body{margin:0;background:var(--page);color:var(--text);font-size:16px;line-height:1.55}a{color:inherit;text-decoration:none}button,input{font:inherit}button{color:inherit}.shell{width:min(1160px,calc(100% - 48px));margin-inline:auto}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.site-header{height:76px;position:sticky;top:0;z-index:20;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:28px;padding:0 max(24px,calc((100vw - 1160px)/2));background:color-mix(in srgb,var(--page) 94%,transparent);border-bottom:1px solid var(--line);backdrop-filter:blur(14px)}.brand{display:inline-flex;width:118px;align-items:center}.brand img{display:block;width:100%;height:auto}.main-nav{display:flex;align-items:center;gap:30px}.main-nav a{color:var(--muted);font-size:.9rem;font-weight:600;transition:color .15s}.main-nav a:hover,.main-nav a:focus-visible{color:var(--text)}.header-actions{display:flex;justify-self:end;align-items:center;gap:12px}.coming-pill{display:inline-flex;align-items:center;gap:8px;padding:7px 12px;border:1px solid var(--line);border-radius:999px;background:var(--surface);color:var(--text);font-size:.76rem;font-weight:700;white-space:nowrap}.status-dot{width:8px;height:8px;flex:none;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px color-mix(in srgb,var(--green) 15%,transparent)}.theme-toggle{width:38px;height:38px;border:1px solid var(--line);border-radius:50%;background:var(--surface);color:var(--muted);cursor:pointer}.theme-toggle:hover{color:var(--accent);border-color:var(--accent)}.theme-icon{font-size:1.15rem}
.hero{display:grid;grid-template-columns:1.12fr .88fr;align-items:center;gap:64px;padding-top:84px;padding-bottom:96px}.hero-copy{max-width:650px}.eyebrow{display:flex;align-items:center;gap:10px;margin:0 0 16px;color:var(--accent);font-size:.72rem;font-weight:800;letter-spacing:.12em}.eyebrow-line{width:18px;height:2px;border-radius:2px;background:var(--accent)}h1,h2,h3,p{margin-top:0}.hero h1{margin:0;font-family:"DM Sans","Poppins",sans-serif;font-size:clamp(3.2rem,7vw,5.3rem);font-weight:650;letter-spacing:-.04em;line-height:1.06}.hero h1 span{color:var(--muted)}.hero-description{max-width:540px;margin:24px 0 30px;color:var(--muted);font-size:1.06rem;line-height:1.7}.hero-actions{display:flex;align-items:center;gap:24px}.button{display:inline-flex;align-items:center;justify-content:center;gap:16px;min-height:48px;padding:0 20px;border:1px solid transparent;border-radius:999px;font-size:.9rem;font-weight:700;transition:transform .15s,background .15s}.button:hover{transform:translateY(-1px)}.button-primary{background:var(--accent);color:#0a1425}.text-link{color:var(--text);font-size:.86rem;font-weight:650}.text-link span{padding-left:4px;color:var(--accent)}.hero-preview{min-height:238px;padding:26px;border:1px solid var(--line);border-radius:1.5rem;background:var(--surface);box-shadow:var(--shadow)}.preview-topline{display:flex;align-items:center;gap:10px;color:var(--subtle);font-size:.68rem;font-weight:800;letter-spacing:.11em}.preview-dot{width:7px;height:7px;background:var(--accent);border-radius:50%}.preview-rule{height:1px;flex:1;background:var(--line)}.preview-target{display:flex;align-items:center;gap:16px;margin:38px 0}.target-mark{display:grid;width:54px;height:54px;place-items:center;border-radius:17px;background:var(--accent-soft);color:var(--accent);font-size:1.35rem;font-weight:850}.preview-target strong,.preview-target small{display:block}.preview-target strong{font-size:1.05rem}.preview-target small{margin-top:4px;color:var(--muted);font-size:.84rem}.preview-divider{height:1px;background:var(--line)}.preview-foot{display:flex;justify-content:space-between;gap:12px;padding-top:18px;color:var(--subtle);font-size:.64rem;font-weight:750;letter-spacing:.08em}
.catalogue{padding-top:22px;padding-bottom:88px}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:26px;margin-bottom:28px}.section-heading .eyebrow{margin-bottom:10px}.section-heading h2{margin:0;font-size:clamp(1.85rem,4vw,2.55rem);font-weight:600;letter-spacing:-.045em;line-height:1.15}.section-intro{margin:10px 0 0;color:var(--muted);font-size:.94rem}.catalogue-counts{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px}.stat-chip{padding:8px 11px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:.75rem;white-space:nowrap}.stat-chip strong{color:var(--text)}.catalogue-toolbar{display:flex;gap:10px;align-items:center;margin-bottom:16px}.search-box{display:flex;align-items:center;gap:10px;width:min(100%,510px);min-height:48px;padding:0 14px;border:1px solid var(--line);border-radius:999px;background:var(--surface)}.search-box>span:first-child{color:var(--muted);font-size:1.35rem;line-height:1}.search-box input{width:100%;min-width:0;border:0;outline:0;background:transparent;color:var(--text);font-size:.88rem}.search-box input::placeholder{color:var(--subtle)}kbd{flex:none;padding:3px 6px;border:1px solid var(--line);border-radius:5px;color:var(--subtle);font-size:.65rem}.clear-search{padding:8px 12px;border:0;background:transparent;color:var(--accent);font-size:.82rem;font-weight:700;cursor:pointer}.category-filters{display:flex;gap:8px;overflow-x:auto;padding:3px 1px 14px;scrollbar-width:thin}.category-filter{flex:none;min-height:36px;padding:7px 13px;border:1px solid var(--line);border-radius:999px;background:transparent;color:var(--muted);font-size:.78rem;font-weight:700;cursor:pointer}.category-filter:hover{border-color:var(--accent);color:var(--text)}.category-filter[aria-pressed="true"]{border-color:var(--accent);background:var(--accent-soft);color:var(--accent)}
.explore-layout{display:grid;grid-template-columns:minmax(245px,.72fr) minmax(0,1.65fr);gap:16px;align-items:start}.exam-panel,.syllabus-panel{min-width:0;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.exam-panel{position:sticky;top:94px;max-height:calc(100vh - 116px);overflow:auto;padding:16px}.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:2px 2px 12px}.panel-heading h3{margin:0;font-size:.93rem}.panel-heading span{color:var(--subtle);font-size:.75rem}.exam-list{display:grid;gap:7px}.exam-choice{display:flex;align-items:center;justify-content:space-between;gap:12px;width:100%;padding:11px 12px;border:1px solid transparent;border-radius:12px;background:transparent;text-align:left;cursor:pointer}.exam-choice:hover{background:var(--surface-hover)}.exam-choice[aria-pressed="true"]{border-color:var(--accent);background:var(--surface-selected)}.exam-choice-copy{min-width:0}.exam-choice strong,.exam-choice small{display:block}.exam-choice strong{font-size:.83rem;line-height:1.35}.exam-choice small{margin-top:3px;color:var(--muted);font-size:.71rem}.choice-mark{display:grid;width:21px;height:21px;flex:none;place-items:center;border:1px solid var(--line);border-radius:50%;color:var(--accent);font-size:.78rem}.exam-choice[aria-pressed="true"] .choice-mark{border-color:var(--accent);background:var(--accent);color:#0a1425}.empty-state{padding:20px 10px;color:var(--muted);text-align:center;font-size:.86rem}
.syllabus-panel{padding:22px}.syllabus-header{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;padding-bottom:18px;border-bottom:1px solid var(--line)}.syllabus-kicker{margin:0 0 6px;color:var(--accent);font-size:.72rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.syllabus-header h3{margin:0;font-size:1.45rem;font-weight:650;letter-spacing:-.03em;line-height:1.25}.syllabus-header p{margin:6px 0 0;color:var(--muted);font-size:.82rem}.syllabus-total{flex:none;padding:6px 10px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:.72rem}.subject-list{display:grid;gap:9px;padding-top:16px}.subject-accordion{border:1px solid var(--line);border-radius:13px;background:var(--surface-raised);overflow:hidden}.subject-accordion>summary{display:flex;align-items:center;justify-content:space-between;gap:14px;min-height:52px;padding:12px 14px;list-style:none;cursor:pointer}.subject-accordion>summary::-webkit-details-marker{display:none}.subject-accordion>summary::after{content:"+";color:var(--accent);font-size:1.2rem;font-weight:500}.subject-accordion[open]>summary::after{content:"−"}.subject-name{font-size:.86rem;font-weight:700}.subject-meta{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:.72rem}.topic-list{display:grid;gap:6px;padding:0 10px 10px}.topic-accordion{border-top:1px solid var(--line);border-radius:7px}.topic-accordion>summary{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:9px 8px;list-style:none;cursor:pointer}.topic-accordion>summary::-webkit-details-marker{display:none}.topic-name{font-size:.8rem}.topic-meta{color:var(--subtle);font-size:.68rem;white-space:nowrap}.subtopic-list{display:flex;flex-wrap:wrap;gap:6px;padding:0 8px 11px}.subtopic-chip{padding:5px 9px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:.7rem}.catalogue-note{display:flex;align-items:center;gap:10px;margin:16px 2px 0;color:var(--muted);font-size:.78rem}.catalogue-note .status-dot{width:7px;height:7px}
.features-section{padding:78px 0 86px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--surface)}.feature-heading{max-width:720px;margin-bottom:32px}.feature-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.feature-card{min-height:170px;padding:20px;border:1px solid var(--line);border-radius:var(--radius);background:var(--page)}.feature-number{display:inline-block;margin-bottom:18px;color:var(--accent);font-size:.7rem;font-weight:850;letter-spacing:.08em}.feature-card h3{margin:0 0 8px;font-size:.98rem;letter-spacing:-.015em}.feature-card p{max-width:310px;margin:0;color:var(--muted);font-size:.82rem;line-height:1.6}.speedmath-note{display:flex;align-items:center;gap:14px;margin-top:14px;padding:17px 19px;border:1px solid var(--line);border-radius:var(--radius);background:var(--page)}.speedmath-mark{display:grid;width:42px;height:42px;flex:none;place-items:center;border-radius:13px;background:var(--accent-soft);color:var(--accent);font-size:1.3rem;font-weight:750}.speedmath-note>div{flex:1}.speedmath-note strong{font-size:.9rem}.speedmath-note p{margin:2px 0 0;color:var(--muted);font-size:.79rem}.site-footer{padding:30px 0 18px}.footer-inner{display:flex;align-items:center;gap:18px;padding-bottom:22px}.footer-inner .brand{width:100px}.footer-inner>p{flex:1;margin:0;color:var(--muted);font-size:.82rem}.back-top{color:var(--muted);font-size:.8rem}.back-top:hover{color:var(--accent)}.footer-bottom{display:flex;justify-content:space-between;gap:12px;padding-top:15px;border-top:1px solid var(--line);color:var(--subtle);font-size:.72rem}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px}::selection{background:var(--accent);color:#071225}
@media(max-width:800px){.site-header{grid-template-columns:1fr auto;padding-inline:24px}.main-nav{grid-row:2;grid-column:1/-1;justify-content:center;gap:25px;height:38px}.site-header{height:106px;row-gap:0}.hero{grid-template-columns:1fr;gap:34px;padding-top:62px;padding-bottom:70px}.hero-preview{max-width:540px}.section-heading{align-items:flex-start;flex-direction:column;gap:16px}.catalogue-counts{justify-content:flex-start}.explore-layout{grid-template-columns:1fr}.exam-panel{position:static;max-height:none}.exam-list{grid-template-columns:repeat(2,minmax(0,1fr))}.feature-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:520px){.shell{width:min(calc(100% - 32px),1160px)}.site-header{padding-inline:16px;grid-template-columns:auto 1fr;column-gap:12px}.brand{width:98px}.header-actions{gap:7px}.coming-pill{padding:6px 9px;font-size:.68rem}.theme-toggle{width:34px;height:34px}.main-nav{justify-content:space-between;gap:10px;padding:0 6px}.main-nav a{font-size:.8rem}.hero{gap:26px;padding-top:48px;padding-bottom:58px}.hero h1{font-size:clamp(2.8rem,13vw,4rem)}.hero-description{font-size:.94rem}.hero-actions{gap:16px;flex-wrap:wrap}.button{min-height:45px}.hero-preview{min-height:210px;padding:20px}.preview-target{margin:30px 0}.preview-foot{font-size:.54rem}.catalogue{padding-bottom:62px}.section-heading h2{font-size:2rem}.catalogue-counts{gap:6px}.stat-chip{padding:7px 9px;font-size:.68rem}.search-box{min-height:45px}.search-box kbd{display:none}.exam-list{grid-template-columns:1fr;max-height:250px;overflow:auto}.syllabus-panel{padding:16px}.syllabus-header h3{font-size:1.2rem}.feature-grid{grid-template-columns:1fr}.feature-card{min-height:148px}.features-section{padding:60px 0}.speedmath-note{align-items:flex-start;flex-wrap:wrap}.speedmath-note>.coming-pill{margin-left:56px}.footer-inner{flex-wrap:wrap;gap:12px}.footer-inner>p{flex-basis:calc(100% - 120px);text-align:right}.back-top{flex-basis:100%;text-align:right}.footer-bottom{font-size:.66rem}}
@media(prefers-reduced-motion:reduce){:root{scroll-behavior:auto}*,*::before,*::after{transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}

/* Tier colors and controls follow the PREP11 catalogue cards while making each access level distinct. */
:root{--subject-accent:#36c995;--topic-accent:#bd91ff}
:root[data-theme="light"]{--subject-accent:#087f65;--topic-accent:#783bd1}
.exam-choice{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:stretch;gap:6px;width:100%;min-height:76px;padding:7px;border:1px solid transparent;border-radius:12px;background:transparent}
.exam-choice:hover{background:var(--surface-hover)}.exam-choice.is-selected{border-color:var(--accent);background:var(--surface-selected)}
.exam-choice-select{display:grid;grid-template-columns:minmax(0,1fr) 21px;align-items:center;gap:8px;min-width:0;padding:7px 5px;border:0;border-radius:8px;background:transparent;text-align:left;cursor:pointer}
.exam-choice-select:hover .exam-choice-copy strong{color:var(--accent)}.exam-choice-select:focus-visible,.exam-choice-price-button:focus-visible,.subject-price-button:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.exam-choice-copy{display:grid;gap:4px;min-width:0}.exam-choice-copy strong{font-size:.88rem;line-height:1.32}.exam-choice-copy small{font-size:.7rem;line-height:1.35;color:var(--muted)}
.exam-choice-summary{display:flex;align-items:center;flex-wrap:wrap;gap:5px 7px}.exam-choice-summary i{padding:2px 6px;border:1px solid var(--line);border-radius:999px;color:var(--subtle);font-size:.55rem;font-style:normal;font-weight:700;line-height:1.35;white-space:nowrap}
.exam-choice-price-button,.subject-price-button{display:grid;justify-items:end;align-content:center;gap:1px;min-width:86px;padding:7px 9px;border:1px solid color-mix(in srgb,var(--accent) 33%,var(--line));border-radius:10px;background:var(--accent-soft);text-align:right;cursor:pointer;transition:background .16s,border-color .16s,transform .16s}
.exam-choice-price-button:hover,.subject-price-button:hover{transform:translateY(-1px);border-color:var(--accent);background:color-mix(in srgb,var(--accent) 17%,var(--surface))}
.exam-choice-price-button strong{font-size:1.1rem;line-height:1.1;color:var(--accent);font-weight:850}.exam-choice-price-button small{font-size:.7rem;color:var(--muted);white-space:nowrap}.exam-choice-price-button span,.subject-price-button span{margin-top:3px;font-size:.59rem;line-height:1.2;color:var(--muted);white-space:nowrap}
.exam-choice .choice-mark{width:20px;height:20px}.exam-choice.is-selected .choice-mark{border-color:var(--accent);background:var(--accent);color:#0a1425}
.subject-row{position:relative;min-width:0}.subject-accordion{position:relative}.subject-accordion>summary{display:grid;grid-template-columns:minmax(0,1fr) 18px;gap:10px;padding-right:150px}
.subject-accordion>summary .subject-summary-copy{display:grid;gap:4px;min-width:0}.subject-accordion>summary .subject-name{font-size:.95rem;line-height:1.25;font-weight:750;letter-spacing:-.01em}
.subject-accordion>summary .subject-meta{display:flex;align-items:center;gap:8px;font-size:.7rem;color:var(--muted)}
.subject-price-button{position:absolute;z-index:1;top:7px;right:42px;min-width:98px;padding:6px 9px;border-color:color-mix(in srgb,var(--subject-accent) 35%,var(--line));background:color-mix(in srgb,var(--subject-accent) 9%,var(--surface-raised))}
.subject-price-button:hover{border-color:var(--subject-accent);background:color-mix(in srgb,var(--subject-accent) 15%,var(--surface-raised))}
.subject-price-button strong{font-size:1.12rem;line-height:1.1;color:var(--subject-accent);font-weight:850}.subject-price-button small{font-size:.72rem;color:var(--muted);white-space:nowrap}
.subject-price-button span{color:var(--subject-accent)}
.topic-card{border-left:3px solid color-mix(in srgb,var(--topic-accent) 70%,transparent);background:color-mix(in srgb,var(--topic-accent) 4%,var(--surface-raised))}
.topic-card:hover{border-color:var(--topic-accent);background:color-mix(in srgb,var(--topic-accent) 9%,var(--surface-raised))}
.topic-card-copy strong{font-size:.83rem;font-weight:650;letter-spacing:0}.topic-card-copy small{font-size:.68rem;color:var(--muted)}
.topic-card-price strong{color:var(--topic-accent)}.topic-card-price small{color:var(--muted)}
.topic-card-status{border-color:color-mix(in srgb,var(--topic-accent) 28%,var(--line));background:color-mix(in srgb,var(--topic-accent) 8%,transparent);color:var(--topic-accent)}
.topic-card-arrow{color:var(--topic-accent)}
.catalogue-note{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:8px 12px}
.catalogue-note>span:nth-child(2){min-width:0}.catalogue-note #landing-enrollment-count{color:var(--green);font-size:.78rem;white-space:nowrap}
.topic-dialog[data-access-type="exam"]{--dialog-tier:var(--accent)}.topic-dialog[data-access-type="subject"]{--dialog-tier:var(--subject-accent)}.topic-dialog[data-access-type="topic"]{--dialog-tier:var(--topic-accent)}
.topic-dialog-kicker{color:var(--dialog-tier,var(--accent));font-size:.73rem;letter-spacing:.1em}
.topic-dialog-context{margin:0 0 7px;color:var(--muted);font-size:.75rem;line-height:1.4}
.topic-dialog-price{border-color:color-mix(in srgb,var(--dialog-tier,var(--accent)) 28%,var(--line));background:color-mix(in srgb,var(--dialog-tier,var(--accent)) 5%,var(--surface-raised))}
.topic-dialog-price strong{color:var(--dialog-tier,var(--accent))}
.topic-dialog[data-access-type="subject"] .topic-dialog-kicker,.topic-dialog[data-access-type="subject"] .topic-dialog-price strong,.topic-dialog[data-access-type="subject"] .topic-enrollment-count strong{color:var(--subject-accent)}
.topic-dialog[data-access-type="topic"] .topic-dialog-kicker,.topic-dialog[data-access-type="topic"] .topic-dialog-price strong,.topic-dialog[data-access-type="topic"] .topic-enrollment-count strong{color:var(--topic-accent)}
.theme-icon{display:inline-grid;width:20px;height:20px;place-items:center;vertical-align:middle}.theme-icon svg{width:19px;height:19px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;transform-origin:center;animation:theme-icon-in .28s cubic-bezier(.2,.8,.2,1) both}
@keyframes theme-icon-in{from{opacity:.3;transform:rotate(-40deg) scale(.72)}to{opacity:1;transform:rotate(0) scale(1)}}
:root.theme-vt::view-transition-old(root){z-index:1}:root.theme-vt::view-transition-new(root){z-index:2;animation:theme-reveal .62s cubic-bezier(.4,0,.2,1) both}
@keyframes theme-reveal{from{clip-path:circle(0 at var(--theme-reveal-x,100%) var(--theme-reveal-y,0))}to{clip-path:circle(150vmax at var(--theme-reveal-x,100%) var(--theme-reveal-y,0))}}
:root.theme-animating,:root.theme-animating *,:root.theme-animating *::before,:root.theme-animating *::after{transition:color .3s ease,background-color .3s ease,border-color .3s ease,box-shadow .3s ease!important}
@media(max-width:800px){.exam-choice{min-height:72px}.catalogue-note{grid-template-columns:auto minmax(0,1fr)}.catalogue-note #landing-enrollment-count{grid-column:2}}
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