@font-face{font-family:"Source Sans 3";font-style:normal;font-weight:200 900;font-display:optional;src:url(../media/da8a9dd0d68e512b-s.0n8i_inn0i2i9.woff2)format("woff2");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:"Source Sans 3";font-style:normal;font-weight:200 900;font-display:optional;src:url(../media/94b4a5dc1fe84361-s.3wm_n5jv1to7s.woff2)format("woff2");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:"Source Sans 3";font-style:normal;font-weight:200 900;font-display:optional;src:url(../media/ff5be760267bb4bc-s.3dkqd4mro2h3_.woff2)format("woff2");unicode-range:U+1F??}@font-face{font-family:"Source Sans 3";font-style:normal;font-weight:200 900;font-display:optional;src:url(../media/99596c30eb072d3c-s.2fp9tilo6sy14.woff2)format("woff2");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:"Source Sans 3";font-style:normal;font-weight:200 900;font-display:optional;src:url(../media/e5864b32625b6bc3-s.0m7i6b77o5yxd.woff2)format("woff2");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:"Source Sans 3";font-style:normal;font-weight:200 900;font-display:optional;src:url(../media/e285ad1a914469f0-s.p.15241mr5-1s6i.woff2)format("woff2");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:"Source Sans 3";font-style:normal;font-weight:200 900;font-display:optional;src:url(../media/47df9ba1c7236d3b-s.p.137759vg1sbmi.woff2)format("woff2");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:"Source Sans 3 Fallback";src:local(Arial);ascent-override:109.21%;descent-override:42.66%;line-gap-override:0.0%;size-adjust:93.76%}.source_sans_3_483f83e8-module__CEZhfW__className{font-family:"Source Sans 3","Source Sans 3 Fallback";font-style:normal}.source_sans_3_483f83e8-module__CEZhfW__variable{--font-sans:"Source Sans 3", "Source Sans 3 Fallback"}
@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:200 900;font-display:optional;src:url(../media/20aee433927f7d4b-s.3x137p1ifayze.woff2)format("woff2");unicode-range:U+460-52F,U+1C80-1C8A,U+20B4,U+2DE0-2DFF,U+A640-A69F,U+FE2E-FE2F}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:200 900;font-display:optional;src:url(../media/256e1f7f180674ba-s.1x971o6gwfy6w.woff2)format("woff2");unicode-range:U+301,U+400-45F,U+490-491,U+4B0-4B1,U+2116}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:200 900;font-display:optional;src:url(../media/be3bf58b83159894-s.1ri8jgkzoo1l-.woff2)format("woff2");unicode-range:U+370-377,U+37A-37F,U+384-38A,U+38C,U+38E-3A1,U+3A3-3FF}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:200 900;font-display:optional;src:url(../media/753b6407f468151f-s.1veyi_qwtij86.woff2)format("woff2");unicode-range:U+102-103,U+110-111,U+128-129,U+168-169,U+1A0-1A1,U+1AF-1B0,U+300-301,U+303-304,U+308-309,U+323,U+329,U+1EA0-1EF9,U+20AB}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:200 900;font-display:optional;src:url(../media/292081311a6a8abc-s.1t-2a-g4m3ypx.woff2)format("woff2");unicode-range:U+100-2BA,U+2BD-2C5,U+2C7-2CC,U+2CE-2D7,U+2DD-2FF,U+304,U+308,U+329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}@font-face{font-family:"Source Serif 4";font-style:normal;font-weight:200 900;font-display:optional;src:url(../media/68d403cf9f2c68c5-s.20at88_q9f_kt.woff2)format("woff2");unicode-range:U+??,U+131,U+152-153,U+2BB-2BC,U+2C6,U+2DA,U+2DC,U+304,U+308,U+329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}@font-face{font-family:"Source Serif 4 Fallback";src:local(Times New Roman);ascent-override:87.87%;descent-override:28.41%;line-gap-override:0.0%;size-adjust:117.91%}.source_serif_4_b1497e6c-module__sOQn1W__className{font-family:"Source Serif 4","Source Serif 4 Fallback";font-style:normal}.source_serif_4_b1497e6c-module__sOQn1W__variable{--font-serif:"Source Serif 4", "Source Serif 4 Fallback"}
@layer properties{@supports (((-webkit-hyphens:none)) and (not (margin-trim:inline))) or ((-moz-orient:inline) and (not (color:rgb(from red r g b)))){*,:before,:after,::backdrop{--tw-rotate-x:initial;--tw-rotate-y:initial;--tw-rotate-z:initial;--tw-skew-x:initial;--tw-skew-y:initial;--tw-border-style:solid;--tw-shadow:0 0 #0000;--tw-shadow-color:initial;--tw-shadow-alpha:100%;--tw-inset-shadow:0 0 #0000;--tw-inset-shadow-color:initial;--tw-inset-shadow-alpha:100%;--tw-ring-color:initial;--tw-ring-shadow:0 0 #0000;--tw-inset-ring-color:initial;--tw-inset-ring-shadow:0 0 #0000;--tw-ring-inset:initial;--tw-ring-offset-width:0px;--tw-ring-offset-color:#fff;--tw-ring-offset-shadow:0 0 #0000;--tw-ease:initial}}}@layer theme{:root,:host{--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";--font-serif:ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;--font-mono:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;--ease-out:cubic-bezier(0, 0, .2, 1);--default-transition-duration:.15s;--default-transition-timing-function:cubic-bezier(.4, 0, .2, 1);--default-font-family:var(--font-sans);--default-mono-font-family:var(--font-mono)}}@layer base{*,:after,:before,::backdrop{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}html,:host{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "Noto Sans", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,samp,pre{font-family:var(--default-mono-font-family,ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring:where(:not(iframe)){outline:auto}progress{vertical-align:baseline}summary{display:list-item}ol,ul,menu{list-style:none}img,svg,video,canvas,audio,iframe,embed,object{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,select,optgroup,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab, red, red)){::placeholder{color:color-mix(in oklab, currentcolor 50%, transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit{padding-block:0}::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-day-field{padding-block:0}::-webkit-datetime-edit-hour-field{padding-block:0}::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-millisecond-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){appearance:button}::file-selector-button{appearance:button}::-webkit-inner-spin-button{height:auto}::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer components;@layer utilities{.collapse{visibility:collapse}.visible{visibility:visible}.sr-only{clip-path:inset(50%);white-space:nowrap;border-width:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.relative{position:relative}.static{position:static}.sticky{position:sticky}.block{display:block}.contents{display:contents}.grid{display:grid}.hidden{display:none}.table{display:table}.transform{transform:var(--tw-rotate-x,) var(--tw-rotate-y,) var(--tw-rotate-z,) var(--tw-skew-x,) var(--tw-skew-y,)}.resize{resize:both}.rounded{border-radius:.25rem}.border{border-style:var(--tw-border-style);border-width:1px}.underline{text-decoration-line:underline}.shadow{--tw-shadow:0 1px 3px 0 var(--tw-shadow-color,#0000001a), 0 1px 2px -1px var(--tw-shadow-color,#0000001a);box-shadow:var(--tw-inset-shadow), var(--tw-inset-ring-shadow), var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow)}.ring{--tw-ring-shadow:var(--tw-ring-inset,) 0 0 0 calc(1px + var(--tw-ring-offset-width)) var(--tw-ring-color,currentcolor);box-shadow:var(--tw-inset-shadow), var(--tw-inset-ring-shadow), var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--tw-shadow)}.transition{transition-property:color,background-color,border-color,outline-color,text-decoration-color,fill,stroke,--tw-gradient-from,--tw-gradient-via,--tw-gradient-to,opacity,box-shadow,transform,translate,scale,rotate,filter,-webkit-backdrop-filter,backdrop-filter,display,content-visibility,overlay,pointer-events;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}.ease-out{--tw-ease:var(--ease-out);transition-timing-function:var(--ease-out)}}:root{--paper:#f5f7f6;--white:#fff;--ink:#18242d;--muted:#5a6b70;--accent:#087f73;--accent-hover:#056c62;--line:#d8dfe0;--soft:#e9efed;--radius:6px;--shadow:0 20px 55px -22px #18242d33;--font-body:var(--font-sans),Arial,sans-serif}*{box-sizing:border-box;letter-spacing:0}html{scroll-behavior:smooth;scroll-padding-top:96px}body{background:var(--paper);color:var(--ink);font-family:var(--font-body);-webkit-font-smoothing:antialiased;margin:0;font-size:17px;line-height:1.5}button,input,select,textarea{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:wait;opacity:.62}a{color:inherit;text-decoration:none}button{color:inherit}svg{flex-shrink:0}img,video{max-width:100%;display:block}h1,h2,h3,p{margin:0}h1,h2,h3{text-wrap:balance;font-weight:600;line-height:1.1}h2{white-space:pre-line;font-size:52px}p{overflow-wrap:break-word}ul,ol{margin:0;padding:0;list-style:none}::selection{color:var(--ink);background:#b8e2d9}:focus-visible{outline:3px solid var(--accent);outline-offset:5px}.shell{width:min(1280px,100% - 96px);margin-inline:auto}.sr-only,.demo-form-honeypot{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}.skip-link{z-index:1000;background:#fff;padding:12px 20px;position:fixed;top:-80px;left:24px}.skip-link:focus{top:12px}.eyebrow{color:var(--accent-hover);font-size:12px;font-weight:700;line-height:1.4}.button{border-radius:var(--radius);background:var(--accent);color:#fff;border:1px solid #0000;justify-content:center;align-items:center;gap:18px;min-height:52px;padding:14px 23px;font-weight:600;line-height:1.2;transition:background .18s,transform .18s,box-shadow .18s;display:inline-flex}.button:hover{background:var(--accent-hover);box-shadow:0 7px 18px -8px #087f7377}.button:active{transform:translateY(1px)}.button-small{gap:14px;min-height:42px;padding:10px 16px;font-size:14px}.text-link{justify-content:center;align-items:center;gap:10px;min-height:44px;font-weight:600;display:inline-flex}.text-link:hover{color:var(--accent)}.site-header{background:var(--paper);border-bottom:1px solid var(--line);z-index:50;height:80px;position:sticky;top:0}.nav-shell{align-items:center;gap:36px;height:100%;display:flex}.wordmark{flex-shrink:0;align-items:center;gap:10px;font-size:25px;font-weight:700;line-height:1;display:inline-flex}.wordmark-mark{width:32px;height:36px;color:var(--accent);font-family:var(--font-serif),Georgia,serif;place-items:center;font-size:36px;font-weight:650;display:grid}.desktop-nav{align-items:center;gap:26px;margin-left:auto;font-size:14px;font-weight:550;display:flex}.desktop-nav a{padding-block:12px;transition:color .15s}.desktop-nav a:hover{color:var(--accent)}.nav-actions{align-items:center;gap:20px;margin-left:auto;display:flex}.locale-link{background:0 0;border:0;min-width:32px;min-height:44px;padding:10px 4px;font-size:13px;font-weight:650}.locale-link:hover{color:var(--accent)}.mobile-menu{display:none;position:relative}.mobile-menu summary{cursor:pointer;place-items:center;width:44px;height:44px;list-style:none;display:grid}.mobile-menu summary::-webkit-details-marker{display:none}.menu-close,.mobile-menu[open] .menu-open{display:none}.mobile-menu[open] .menu-close{display:block}.mobile-menu nav{border:1px solid var(--line);width:310px;max-width:calc(100vw - 36px);box-shadow:var(--shadow);background:#fff;border-radius:6px;flex-direction:column;gap:2px;padding:16px;display:flex;position:absolute;top:54px;right:0}.mobile-menu nav a,.mobile-menu nav button{text-align:left;background:0 0;border:0;border-radius:3px;padding:12px;font-size:16px;display:block}.mobile-menu nav a:hover,.mobile-menu nav button:hover{background:var(--soft)}.hero{padding-top:28px}.hero-copy{text-align:center;max-width:900px;margin:0 auto 20px}.hero h1{margin:12px 0 16px;font-size:52px;line-height:1.06}.hero h1 span{display:block}.hero h1 span:last-child{color:var(--accent)}.hero-intro{color:var(--muted);max-width:680px;margin:auto;font-size:20px;line-height:1.5}.hero-actions{flex-wrap:wrap;justify-content:center;align-items:center;gap:28px;margin-top:19px;display:flex}.cinema{max-width:1100px;margin:auto}.lesson-reveal-stage{height:480px;margin-bottom:32px;position:relative}.scene-pause{z-index:2;border:1px solid var(--line);background:var(--paper);width:44px;height:44px;color:var(--ink);cursor:pointer;border-radius:50%;place-items:center;display:grid;position:absolute;top:0;right:0}.scene-pause:hover{border-color:var(--accent);background:#fff}.lesson-reveal-canvas{position:absolute;inset:0}.lesson-reveal-canvas canvas{width:100%;height:100%;display:block}.lesson-player-controls{left:var(--film-x);top:var(--film-y);width:var(--film-width);color:#fff;background:#18242d;border-radius:0 0 5px 5px;align-items:center;gap:12px;min-height:44px;padding:5px 10px;font-size:12px;display:flex;position:absolute}.lesson-player-controls>button{color:#fff;background:0 0;border:0;flex-shrink:0;place-items:center;width:34px;height:34px;display:grid}.lesson-player-time{font-variant-numeric:tabular-nums;white-space:nowrap}.lesson-player-time span{color:#bbc9cc}.lesson-player-controls>a{align-items:center;gap:6px;min-height:32px;margin-left:auto;font-weight:600;display:flex}.lesson-player-controls a:hover{text-decoration:underline}.lesson-player-track{background:#d4e2dc;height:2px;position:absolute;inset:0 0 auto}.lesson-player-track i{background:var(--accent);transform-origin:0;height:100%;transform:scaleX(var(--clip-progress,0));display:block}.lesson-reveal[data-ready=false] .lesson-reveal-canvas{visibility:hidden}.lesson-reveal-fallback:not([hidden]){place-items:center;display:grid;position:absolute;inset:0}.lesson-reveal-fallback img,.lesson-reveal-fallback svg{object-fit:contain;width:90%;height:90%;min-height:0}.reveal-playback{gap:4px;display:flex;position:absolute;right:0}.reveal-caption{min-height:42px;color:var(--muted);justify-content:center;align-items:center;gap:24px;font-size:13px;display:flex}.reveal-caption a{min-height:44px;color:var(--accent-hover);align-items:center;gap:8px;display:inline-flex}.reveal-caption a:hover{text-decoration:underline}.cinema-plane{aspect-ratio:2.55;border:1px solid var(--line);background:#fff;border-radius:4px;position:relative;box-shadow:0 1px #fff,0 6px 0 -2px #e9eeec,0 8px 0 -2px #cdd8d4,0 25px 45px -22px #18242d40}.cinema-frame{visibility:hidden;opacity:0;border-radius:inherit;transition:transform .45s;position:absolute;inset:0;overflow:hidden;transform:translateY(6px)}.cinema-frame.is-active{opacity:1;visibility:visible;transform:translateY(0)}.cinema-original{grid-template-columns:1fr 1fr;align-items:center;gap:50px;padding:22px 9%;display:grid}.cinema-original .question-paper{box-shadow:none;background:0 0;border:0;grid-template-rows:auto auto minmax(0,1fr) auto auto;height:100%;min-height:0;padding:0;display:grid}.cinema-original .derivative-graph{height:100%;min-height:0}.source-note{border-left:1px solid var(--line);padding:24px 0 24px 40px}.source-note>span{color:#ced8d4;font-size:70px;font-weight:600;line-height:1}.source-note p{margin-top:18px;font-size:25px;font-weight:550}.source-note small{color:var(--muted);margin-top:7px;font-size:16px;display:block}.question-paper{border:1px solid var(--line);background:#fff;border-radius:4px;padding:26px}.paper-running-head{color:var(--muted);justify-content:space-between;align-items:center;font-size:10px;font-weight:650;display:flex}.paper-running-head>span:first-child{color:var(--ink);font-size:17px}.paper-stem{margin-top:10px;font-size:12px}.derivative-graph{width:100%;height:auto;display:block}.paper-given{font-family:var(--font-serif),Georgia,serif;margin-top:8px;font-size:21px}.paper-question{margin-top:10px;font-size:12px;font-weight:600}.teaching-board{grid-template-rows:minmax(0,1fr) auto;grid-template-columns:1fr 1fr;height:100%;padding:22px 36px 0;display:grid}.teaching-diagram{grid-template-rows:auto minmax(0,1fr) auto;min-height:0;padding-right:26px;display:grid}.teaching-diagram .derivative-graph{height:100%;min-height:0}.teaching-working{border-left:1px solid var(--line);flex-direction:column;justify-content:center;padding:12px 0 12px 32px;display:flex}.working-label{color:var(--accent);margin-bottom:15px;font-size:10px;font-weight:700}.working-row{font-family:var(--font-serif),Georgia,serif;margin-bottom:13px;font-size:24px;line-height:1.4}.working-row small{color:var(--muted);font-size:13px;font-family:var(--font-body);display:block}.working-result{color:var(--accent);font-size:34px}.teaching-caption{border-top:1px solid var(--line);color:var(--muted);grid-column:1/-1;align-items:center;gap:14px;margin-top:12px;padding:17px 0;font-size:12px;display:flex}.audio-bars{flex-shrink:0;align-items:center;gap:3px;height:27px;display:flex}.audio-bars i{background:var(--accent);width:2px;display:block}.cinema-final{background:#fff;padding-bottom:36px}.cinema-final .teaching-caption{margin-top:0;padding-block:10px}.film-edge{height:36px;color:var(--accent-hover);border-top:1px solid var(--line);background:#f5f8f7;align-items:center;gap:12px;padding:0 25px;font-size:12px;display:flex;position:absolute;bottom:0;left:0;right:0}.film-edge svg:last-child{margin-left:auto}.cinema-controls{justify-content:center;align-items:center;min-height:52px;margin-top:10px;display:flex;position:relative}.cinema-controls ol{align-items:center;gap:4px;display:flex}.cinema-controls button{min-height:44px;color:var(--muted);background:0 0;border:0;justify-content:center;align-items:center;padding:8px 18px;font-size:13px;display:inline-flex}.cinema-controls li.is-active button{color:var(--accent-hover);box-shadow:inset 0 -2px var(--accent)}.cinema-controls button:hover{color:var(--ink)}.cinema-controls .reveal-playback button{border:1px solid var(--line);border-radius:50%;width:44px;padding:0}.cinema-demo-link{text-align:center;color:var(--accent-hover);margin-top:-5px;font-size:12px}.cinema-demo-link a{align-items:center;gap:8px;min-height:32px;display:inline-flex}.cinema-demo-link a:hover{text-decoration:underline}.benefit-strip{border-top:1px solid var(--line);color:var(--muted);justify-content:space-around;align-items:center;gap:24px;margin-top:12px;padding:18px 0;font-size:15px;display:flex}.benefit-strip>span{align-items:center;gap:10px;display:flex}.benefit-strip svg{color:var(--accent)}.workflow-section{border-top:1px solid var(--line);height:300vh;margin-top:50px;position:relative}.workflow-sticky{flex-direction:column;height:calc(100vh - 80px);min-height:620px;max-height:900px;padding-top:38px;padding-bottom:24px;display:flex;position:sticky;top:80px}.workflow-heading{justify-content:space-between;align-items:end;gap:45px;display:flex}.workflow-heading h2{max-width:660px;font-size:43px}.workflow-heading>p{color:var(--muted);max-width:350px;font-size:17px;line-height:1.6}.workflow-composition{flex-direction:column;flex:1;min-height:0;display:flex}.workflow-art{flex:1;min-height:315px;margin-top:10px;position:relative}.workflow-world,.workflow-world-canvas,.workflow-world-fallback{position:absolute;inset:0}.workflow-world-canvas canvas{width:100%;height:100%;display:block}.workflow-world[data-ready=false] .workflow-world-canvas{visibility:hidden}.workflow-world-fallback:not([hidden]){justify-content:center;align-items:center;display:flex}.workflow-world-fallback .book-artwork{width:min(620px,92%)}.workflow-object{opacity:0;visibility:hidden;pointer-events:none;flex-direction:column;justify-content:center;align-items:center;transition:opacity .5s,transform .5s,visibility .5s;display:flex;position:absolute;inset:0;transform:translateY(12px)}.workflow-object.is-active{opacity:1;visibility:visible;animation:.45s ease-out both workflow-enter;transform:translateY(0)}@keyframes workflow-enter{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.workflow-book .book-artwork{width:min(620px,70%)}.book-artwork{aspect-ratio:1.75;width:100%;margin-inline:auto;position:relative}.book-page-block{background:#e7eeeb;border:1px solid #bac9c3;border-radius:5px;position:absolute;inset:13px -5px -8px;box-shadow:0 5px 0 -2px #fff,0 8px 0 -2px #cad6d0,0 30px 28px -18px #18242d50}.book-spread{grid-template-columns:1fr 1fr;height:100%;display:grid;position:relative}.book-page{background:#fff;border:1px solid #cdd7d2;flex-direction:column;min-width:0;padding:26px 30px;display:flex;position:relative}.book-page-left{transform-origin:100%;border-radius:3px 0 0 3px;transform:rotate(-1deg);box-shadow:inset -14px 0 20px -18px #223e3490}.book-page-right{transform-origin:0;border-radius:0 3px 3px 0;transform:rotate(1deg);box-shadow:inset 14px 0 20px -18px #223e3490}.page-topline{border-bottom:1px solid var(--line);color:var(--muted);justify-content:space-between;gap:12px;padding-bottom:13px;font-size:9px;display:flex}.book-page h3{margin-top:26px;font-size:31px}.book-page>p:not(.paper-given){color:var(--muted);margin-top:9px;font-size:12px}.book-page .derivative-graph{width:100%;height:110px;margin-top:12px}.book-page .paper-given{text-align:center;margin:0;font-size:14px}.book-content-lines{gap:14px;margin-top:26px;display:grid}.book-content-lines>div{color:#586c62;align-items:center;gap:18px;font-size:10px;display:flex}.book-content-lines i{background:#dce5e0;height:3px;display:block}.book-page-number{color:var(--muted);margin-top:auto;padding-top:15px;font-size:10px}.book-page-right .book-page-number{text-align:right}.book-question-rule{border-top:1px solid var(--line);margin-top:14px}.book-binding{background:#b6c8be;width:2px;position:absolute;top:0;bottom:0;left:50%;box-shadow:0 0 13px 3px #b6c8be25}.parallel-questions{width:min(1050px,96%);padding:0 0 10px;position:relative}.batch-origin{color:var(--muted);justify-content:center;align-items:center;gap:9px;margin:0 auto 18px;font-size:12px;display:flex}.batch-origin-rule{background:#b1c6ba;width:80px;height:1px}.batch-field{grid-template-columns:repeat(12,1fr);gap:12px;margin-bottom:-34px;padding:0 15px;display:grid}.batch-sheet{background:#fff;border:1px solid #bdcdc4;border-radius:3px;height:128px;padding:11px 8px;box-shadow:0 6px 0 -3px #dce6df,0 11px 18px -12px #18242d60}.batch-sheet:nth-child(3n+1){transform:translateY(9px)}.batch-sheet:nth-child(3n){transform:translateY(-5px)}.batch-sheet-header{justify-content:space-between;align-items:center;margin-bottom:16px;display:flex}.batch-sheet-header>span:first-child{background:#95a99d;width:5px;height:5px}.batch-sheet-header>span:last-child{background:#c8d6cd;width:12px;height:2px}.batch-sheet-lines{gap:6px;display:grid}.batch-sheet-lines i{background:#d5dfd9;height:2px;display:block}.batch-sheet-lines i:last-child{width:68%}.batch-sheet-result{color:var(--accent);border-top:1px solid var(--line);margin-top:14px;padding-top:8px;display:block}.batch-sheet-result>i{background:var(--accent);transform-origin:0;width:100%;height:3px;display:block;transform:scaleX(.25)}.workflow-lesson.is-active .batch-sheet-result>i{animation:2.4s ease-out both parallel-fill;animation-delay:calc(var(--index) * 45ms)}.workflow-question.is-active .batch-sheet{animation:.6s ease-out both batch-open;animation-delay:calc(var(--index) * 25ms)}.parallel-papers{grid-template-columns:1fr 1fr;gap:26px;width:77%;margin:0 auto;display:grid;position:relative}.parallel-paper{border:1px solid var(--line);background:#fff;border-radius:4px;padding:17px 22px;box-shadow:0 4px 0 -1px #e7eeea,0 5px 0 -1px #c7d3cc,0 23px 38px -23px #18242d50}.parallel-paper:first-child{transform:translateY(-8px)}.parallel-paper:last-child{transform:translateY(8px)}.parallel-paper-head{color:var(--muted);justify-content:space-between;align-items:center;font-size:12px;display:flex}.parallel-active-dot{background:var(--accent);border-radius:50%;width:7px;height:7px}.parallel-paper-head svg{color:var(--accent)}.parallel-paper>.derivative-graph{height:132px}.parallel-math{font-family:var(--font-serif),Georgia,serif;text-align:center;padding-block:4px 16px;font-size:18px}.workflow-lesson.is-active .parallel-math{animation:.6s ease-out .5s both lesson-math}.parallel-paper>img{aspect-ratio:16/9;object-fit:contain;margin-block:8px}.parallel-track{grid-template-columns:1fr 1fr 1fr;gap:5px;display:grid}.parallel-progress-fill{background:var(--accent);transform-origin:0;opacity:.45;height:3px;display:block;transform:scaleX(.2)}.parallel-paper-foot{color:var(--muted);align-items:center;gap:8px;margin-top:10px;font-size:11px;display:flex}.parallel-paper-foot .audio-bars{height:20px}.parallel-spine-label{color:var(--muted);text-align:center;margin-top:27px;font-size:12px}.parallel-spine-label>span{background:#a4bbb0;width:60px;height:1px;margin:10px auto 0;display:block}.workflow-lesson.is-active .parallel-progress-fill{animation:1.9s ease-out both parallel-fill}.workflow-lesson.is-active .parallel-paper:last-child .parallel-progress-fill{animation-duration:2.3s}.workflow-lesson.is-active .parallel-progress-fill:nth-child(2){animation-delay:.15s}.workflow-lesson.is-active .parallel-progress-fill:nth-child(3){animation-delay:.3s}.parallel-production-caption{color:var(--accent-hover);justify-content:center;align-items:center;gap:15px;margin-top:7px;font-size:13px;display:flex}.parallel-questions.is-finished .parallel-progress-fill{opacity:1;transform:scaleX(1)}.workflow-collection>p{color:var(--accent-hover);align-items:center;gap:10px;font-size:13px;display:flex}.workflow-copy{border-top:1px solid var(--line);grid-template-columns:.9fr 1.1fr;align-items:start;gap:22px 60px;padding-top:18px;display:grid}.workflow-tabs{justify-content:space-between;align-items:start;gap:10px;display:flex}.workflow-tabs button{min-height:46px;color:var(--muted);background:0 0;border:0;border-bottom:2px solid #0000;padding:12px 0;font-size:13px}.workflow-tabs button[aria-pressed=true]{color:var(--accent-hover);border-color:var(--accent);font-weight:650}.workflow-tabs button:hover{color:var(--ink)}.workflow-caption{min-height:86px}.workflow-caption h3{font-size:23px;line-height:1.2}.workflow-caption p{color:var(--muted);margin-top:10px;font-size:15px;line-height:1.5}.workflow-progress{background:var(--line);grid-column:1/-1;height:2px}.workflow-progress>span{background:var(--accent);transform-origin:0;width:100%;height:100%;transition:transform .45s;display:block}@keyframes parallel-fill{0%{opacity:.4;transform:scaleX(.12)}to{opacity:1;transform:scaleX(1)}}@keyframes batch-open{0%{opacity:0;translate:0 18px}to{opacity:1;translate:0}}@keyframes lesson-math{0%{opacity:0;translate:0 7px}to{opacity:1;translate:0}}.benchmark-section{border-block:1px solid var(--line);background:#eaf0ed;padding:96px 0 32px}.benchmark-layout{grid-template-columns:1.05fr 1fr;gap:40px 110px;display:grid}.benchmark-copy h2{margin:20px 0 22px;font-size:50px}.benchmark-copy>p:not(.eyebrow){color:var(--muted);max-width:420px;font-size:20px}.benchmark-copy>small{color:var(--muted);max-width:500px;margin-top:28px;font-size:12px;line-height:1.6;display:block}.benchmark-results{flex-direction:column;justify-content:center;gap:38px;display:flex}.exam-heading{justify-content:space-between;align-items:baseline;gap:18px;display:flex}.exam-heading h3{font-size:20px;line-height:1.3}.exam-heading p{color:var(--muted);white-space:nowrap}.exam-heading strong{color:var(--accent);font-size:62px;font-weight:600;line-height:1}.exam-full{color:var(--accent-hover);align-items:center;gap:9px;margin-top:15px;font-size:12px;display:flex}.exam-full>span:first-child{background:var(--accent);flex:1;height:4px}.benchmark-details{border-top:1px solid #cbd8d0;grid-column:1/-1;margin-top:16px}.benchmark-details summary{cursor:pointer;color:var(--ink);justify-content:space-between;align-items:center;min-height:50px;padding:22px 0 0;font-size:14px;list-style:none;display:flex}.benchmark-details summary::-webkit-details-marker{display:none}.benchmark-details[open] summary svg{transform:rotate(45deg)}.subject-results{grid-template-columns:1fr 1fr;gap:0 70px;margin:24px 0 8px;display:grid}.subject-result{border-top:1px solid #cbd8d0;align-items:center;gap:16px;padding:17px 0;font-size:15px;display:flex}.subject-result>span:first-child{color:var(--muted);min-width:29px;font-size:12px}.subject-result strong{flex:1;font-weight:550}.subject-result svg{color:var(--accent-hover)}.subject-results>p{color:var(--muted);grid-column:1/-1;max-width:660px;margin-top:20px;font-size:12px}.flagship-section{padding-block:110px 100px}.film-heading{justify-content:space-between;align-items:end;gap:45px;margin-bottom:35px;display:flex}.film-heading h2{max-width:700px;margin-top:15px;font-size:45px}.film-heading>p{color:var(--muted);max-width:320px;font-size:17px}.grounded-proof{margin-bottom:38px}.grounded-proof-stage{height:410px;position:relative}.supporting-section .grounded-proof{grid-column:1/-1;margin-bottom:0}.supporting-section .supporting-copy{grid-column:1/-1;max-width:750px}.supporting-section .supporting-video{grid-column:1/-1;width:min(900px,100%);margin-inline:auto}.grounded-proof-canvas{position:absolute;inset:0}.grounded-proof-canvas canvas{width:100%;height:100%;display:block}.grounded-proof[data-ready=false] canvas{visibility:hidden}.grounded-proof-fallback{justify-content:center;align-items:center;gap:35px;display:flex;position:absolute;inset:0}.grounded-proof-fallback svg{width:48%;height:auto}.grounded-proof-fallback p{color:var(--accent);font-size:24px}.grounded-proof-controls{justify-content:center;align-items:center;gap:28px;display:flex}.grounded-proof-controls>div{gap:26px;display:flex}.grounded-proof-controls button{min-height:44px;color:var(--muted);background:0 0;border:0;border-bottom:2px solid #0000;justify-content:center;align-items:center;gap:6px;font-size:14px;display:flex}.grounded-proof-controls button[aria-pressed=true]{color:var(--accent);border-bottom-color:var(--accent)}.grounded-proof-controls .proof-playback{gap:6px}.proof-playback button{border:1px solid var(--line);border-radius:50%;width:38px;min-height:38px}.grounded-proof-controls button:hover{color:var(--accent)}.proof-caption{color:var(--muted);text-align:center;min-height:44px;margin-top:12px;font-size:14px}.workflow-film-control{color:var(--accent-hover);align-items:center;gap:12px;margin-top:10px;font-size:14px;display:flex}.workflow-film-control button{border:1px solid var(--line);background:0 0;border-radius:50%;place-items:center;width:36px;height:36px;display:grid}.workflow-film-control a:hover{text-decoration:underline}.video-frame{background:#fff;border:1px solid #bacbc3;border-radius:5px;position:relative;overflow:hidden;box-shadow:0 27px 50px -32px #18242d55}.video-frame video{aspect-ratio:16/9;object-fit:contain;width:100%;display:block}.video-play{background:var(--accent);color:#fff;border:0;border-radius:4px;align-items:center;gap:12px;min-height:50px;padding:12px 20px;font-size:15px;font-weight:600;display:flex;position:absolute;bottom:22px;left:24px;box-shadow:0 6px 18px #123f312b}.video-play:hover{background:var(--accent-hover)}.video-pause,.video-resume{border:1px solid var(--line);width:44px;height:44px;color:var(--ink);background:#fff;border-radius:50%;place-items:center;display:grid;position:absolute;top:16px;right:16px}.video-pause{opacity:0;transition:opacity .15s}.video-frame:hover .video-pause,.video-pause:focus-visible{opacity:1}.video-error{z-index:2;background:#fff;padding:15px;font-size:14px;position:absolute;inset:0 0 auto}.video-error a{color:var(--accent-hover);text-decoration:underline}.film-caption{color:var(--muted);justify-content:space-between;gap:20px;padding-top:22px;font-size:14px;display:flex}.film-caption>div{gap:26px;display:flex}.delivery-section{border-block:1px solid var(--line);background:#eaf0ed;padding:95px 0}.delivery-layout{grid-template-columns:.8fr 1.2fr;align-items:start;gap:40px;display:grid}.delivery-copy h2{font-size:48px}.delivery-copy>p{color:var(--muted);max-width:460px;margin-top:25px;font-size:19px;line-height:1.6}.delivery-copy ul{margin-top:28px}.delivery-copy li{border-top:1px solid #cbd8d0;align-items:start;gap:13px;padding:17px 0;font-size:16px;display:flex}.delivery-copy li svg{color:var(--accent);margin-top:3px}.delivery-art{min-width:0}.delivery-time{flex-direction:column;align-items:center;margin-bottom:0;display:flex}.delivery-time strong{color:var(--accent);font-size:74px;font-weight:550;line-height:1}.delivery-time>span{color:var(--accent-hover);margin-top:8px;font-size:15px}.delivery-book{position:relative}.delivery-book:after{content:"";height:440px;display:block}.delivery-book-sticky{position:sticky;top:110px}@media (min-width:1024px) and (prefers-reduced-motion:no-preference){.delivery-copy{padding-top:30px;position:sticky;top:155px}}@media (prefers-reduced-motion:reduce){.delivery-book:after{display:none}.delivery-book-sticky{position:static}}.delivery-book-stage{height:470px;position:relative}.delivery-book-canvas{position:absolute;inset:0 0 56px}.delivery-set-label{border-top:1px solid var(--line);min-height:44px;color:var(--ink);align-items:center;gap:10px;padding-top:12px;display:flex;position:absolute;bottom:8px;left:8%;right:8%}.delivery-set-label[aria-hidden=true]{visibility:hidden}.delivery-set-label svg{color:var(--accent);flex-shrink:0}.delivery-set-label strong{font-size:18px;font-weight:600;line-height:1.3}.delivery-set-label span{color:var(--accent);flex-shrink:0;margin-left:auto;font-size:12px}.delivery-book-canvas canvas{width:100%;height:100%;display:block}.delivery-book[data-ready=false] canvas{visibility:hidden}.delivery-book-fallback{grid-template-columns:1fr 1fr;align-content:center;gap:20px;display:grid;position:absolute;inset:38px 12%}.delivery-book-fallback[hidden]{display:none}.delivery-book-fallback>span{text-align:center;grid-column:1/-1;font-size:24px;font-weight:600}.delivery-book-fallback img{width:100%;height:auto;box-shadow:0 12px 20px -12px #18242d44}.delivery-book-controls{justify-content:center;align-items:center;gap:8px;min-height:48px;display:flex}.delivery-book-controls p{color:var(--accent-hover);margin-right:12px;font-size:14px}.delivery-book-controls button{border:1px solid var(--line);width:40px;height:40px;color:var(--ink);background:0 0;border-radius:50%;flex-shrink:0;place-items:center;display:grid}.delivery-book-controls button:hover{border-color:var(--accent);background:#fff}.delivery-watch{color:var(--accent-hover);justify-content:center;align-items:center;gap:8px;min-height:36px;font-size:13px;display:flex}.delivery-watch:hover{text-decoration:underline}.delivery-timing-note{color:var(--muted);text-align:center;max-width:400px;margin:16px auto 0;font-size:12px}.supporting-section{grid-template-columns:.7fr 1.3fr;align-items:center;gap:70px;padding-block:115px;display:grid}.supporting-copy h2{font-size:38px}.supporting-copy p{color:var(--muted);margin-top:25px;font-size:18px}.supporting-video .video-play{min-height:44px;font-size:13px;bottom:15px;left:15px}.final-section{border-top:1px solid var(--line);background:#fff;padding-block:90px}.final-layout{grid-template-columns:1fr 1fr;align-items:start;gap:80px;max-width:1080px;display:grid}.final-copy h2{max-width:430px;font-size:48px}.final-copy>p{color:var(--muted);max-width:380px;margin-top:24px;font-size:18px}.contact-email{color:var(--accent-hover);align-items:center;gap:14px;min-height:44px;margin-top:32px;font-size:17px;display:inline-flex}.contact-email:hover{text-decoration:underline}.demo-form-grid{grid-template-columns:1fr 1fr;gap:22px;display:grid}.demo-form-grid label{flex-direction:column;gap:9px;font-size:15px;display:flex}.contact-email-field{grid-column:1/-1}.sat-result .exam-heading{flex-direction:column;align-items:start;gap:12px}.sat-result .exam-heading strong{font-size:56px}.benchmark-method{max-width:700px;color:var(--muted);margin-top:24px;font-size:16px;line-height:1.65}.demo-form-grid input,.demo-form-grid textarea{width:100%;min-width:0;color:var(--ink);background:#fff;border:1px solid #aebfba;border-radius:4px;min-height:49px;padding:13px 14px;font-size:16px}.demo-form-grid textarea{resize:vertical;min-height:90px;max-height:260px}.contact-message{grid-column:1/-1}.contact-note-toggle{min-height:40px;color:var(--muted);background:0 0;border:0;align-items:center;gap:8px;font-size:14px;display:inline-flex}.contact-note-toggle:hover,.contact-note-toggle[aria-expanded=true]{color:var(--accent)}.contact-note-toggle small{margin-left:8px;font-size:12px}.contact-message label[hidden]{display:none}.contact-message label:not([hidden]){margin-top:8px}.contact-message>span{justify-content:space-between;gap:12px;display:flex}.contact-message small{color:var(--muted);font-size:12px}.demo-form-submit{justify-content:space-between;width:200px;margin-top:14px}.contact-privacy{color:var(--muted);max-width:400px;margin-top:12px;font-size:12px;line-height:1.5}.demo-form-error{background:#fff7f5;border:1px solid #ca877b;flex-wrap:wrap;align-items:start;gap:10px;margin-top:20px;padding:15px;font-size:13px;display:flex}.demo-form-error>div{flex:1;gap:6px;display:grid}.demo-form-error>a{color:var(--accent-hover);text-decoration:underline}.demo-form-success{min-height:220px;padding:30px 0}.demo-form-success>svg{color:var(--accent)}.demo-form-success h3{margin-block:20px 14px;font-size:28px}.demo-form-success p{color:var(--muted)}.site-footer{justify-content:space-between;align-items:start;gap:25px;padding-block:40px;display:flex}.site-footer>div>p{color:var(--muted);margin-top:15px;font-size:12px}.site-footer nav{gap:23px;padding-top:8px;font-size:13px;display:flex}.site-footer nav a:hover{color:var(--accent)}.footer-meta{flex-direction:column;align-items:flex-end;gap:12px;display:flex}.footer-meta .locale-link{min-height:44px;padding:8px 0;font-size:14px}.footer-meta small{color:var(--muted);padding-top:8px;font-size:12px}.hero-brand{color:var(--accent);margin-bottom:16px;font-size:26px;font-weight:600}@media (min-width:1600px){.shell{width:min(1440px,100% - 140px)}.hero h1{font-size:66px}.cinema{max-width:1060px}.workflow-sticky{padding-top:55px}.workflow-art{max-height:570px}}@media (max-width:1199px){.shell{width:calc(100% - 64px)}.nav-shell{gap:22px}.desktop-nav{gap:17px;font-size:13px}.nav-cta{display:none}.workflow-heading h2{font-size:37px}.workflow-heading>p{max-width:320px;font-size:16px}.workflow-copy{gap:20px 32px}.workflow-tabs{gap:13px}.workflow-tabs button{font-size:12px}.workflow-caption h3{font-size:21px}.benchmark-layout{gap:40px 65px}.delivery-layout{gap:50px}.delivery-copy h2{font-size:40px}.final-layout{gap:60px}.supporting-section{gap:38px}.supporting-copy h2{font-size:33px}}@media (min-width:1024px) and (max-height:800px){.hero{padding-top:15px}.hero h1{margin-block:10px;font-size:43px}.hero-intro{max-width:760px;font-size:17px;line-height:1.45}.hero-actions{margin-top:16px}.hero-copy{margin-bottom:20px}.cinema{max-width:960px}.lesson-reveal-stage{height:410px}.cinema-controls{min-height:46px;margin-top:8px}.benefit-strip{margin-top:9px;padding-block:14px}.cinema-plane .teaching-board{padding-top:17px}.cinema-plane .working-row{margin-bottom:9px;font-size:20px}.cinema-plane .working-result{font-size:27px}.cinema-plane .teaching-caption{margin-top:2px;padding-block:10px;font-size:10px}}@media (max-width:1023px){h2{font-size:38px}.site-header{height:70px}.desktop-nav{display:none}.nav-actions{margin-left:auto}.mobile-menu{display:block}.hero{padding-top:34px}.hero h1{font-size:54px}.hero-intro{max-width:590px;font-size:18px}.cinema-plane{aspect-ratio:2.2}.cinema-original{gap:20px;padding:20px 6%}.source-note{padding-left:25px}.source-note>span{font-size:54px}.source-note p{font-size:23px}.working-row{font-size:20px}.working-result{font-size:29px}.teaching-board{padding:23px 26px 0}.teaching-diagram{padding-right:18px}.teaching-working{padding-left:20px}.teaching-caption{padding-block:14px;font-size:11px}.benefit-strip{gap:15px;font-size:13px}.workflow-section{height:auto;margin-top:20px;padding-block:55px}.workflow-sticky{height:auto;min-height:0;max-height:none;padding-block:0;position:static}.workflow-sticky:after{content:"";flex-shrink:0;height:1100px;display:block}.workflow-composition{flex:none;position:sticky;top:78px}.delivery-book-sticky{top:78px}.workflow-heading{display:block}.workflow-heading h2{max-width:620px;font-size:39px}.workflow-heading>p{max-width:560px;margin-top:20px;font-size:17px}.workflow-art{flex:auto;height:min(435px,47svh);min-height:0;margin-top:28px}.workflow-book .book-artwork{width:min(580px,88%)}.workflow-copy{flex-direction:column;gap:23px;display:flex}.workflow-tabs{justify-content:start;gap:35px;width:100%}.workflow-tabs button{font-size:15px}.workflow-caption{max-width:620px;min-height:136px}.workflow-caption h3{font-size:25px}.workflow-caption p{font-size:16px}.workflow-progress,.parallel-questions{width:100%}.parallel-papers{gap:23px;width:87%}.batch-field{gap:8px}.batch-sheet{padding:10px 6px}.benchmark-section{padding-top:65px}.benchmark-layout{gap:36px}.benchmark-copy h2{font-size:37px}.benchmark-copy>p:not(.eyebrow){font-size:17px}.exam-heading{display:block}.exam-heading h3{margin-bottom:10px;font-size:18px}.exam-heading strong{font-size:52px}.subject-results{gap:0 30px}.subject-result{gap:10px;font-size:13px}.flagship-section{padding-block:70px}.film-heading{display:block}.film-heading h2{max-width:590px;font-size:39px}.film-heading>p{max-width:560px;margin-top:20px}.delivery-section{padding-block:70px}.delivery-layout{grid-template-columns:1fr;gap:40px}.delivery-art{width:100%;max-width:780px;margin-inline:auto}.delivery-copy h2{font-size:34px}.delivery-copy>p{font-size:17px}.delivery-copy li{font-size:14px}.delivery-time{padding-left:0}.delivery-time strong{font-size:60px}.delivery-timing-note{margin-inline:auto}.supporting-section{grid-template-columns:1fr;gap:30px;padding-block:70px}.supporting-copy{grid-template-columns:1fr 1fr;gap:35px;display:grid}.supporting-copy p{margin:0;font-size:17px}.supporting-copy h2{font-size:32px}.supporting-video{width:86%;margin-left:auto}.final-section{padding-block:70px}.final-copy h2{font-size:39px}.final-copy>p{font-size:18px}.final-layout{gap:35px}.demo-form-grid{grid-template-columns:1fr;gap:18px}.site-footer,.site-footer nav{flex-wrap:wrap}}@media (max-width:599px){.shell{width:calc(100% - 36px)}.site-header{height:64px}.nav-shell{gap:14px}.wordmark{gap:8px;font-size:23px}.wordmark-mark{width:29px;font-size:32px}.nav-actions{gap:10px}.hero{padding-top:27px}.hero-copy{text-align:left;margin-bottom:28px}.hero .eyebrow{font-size:10px}.hero h1{margin:17px 0;font-size:36px;line-height:1.08}.hero-intro{font-size:16px;line-height:1.5}.hero-actions{justify-content:start;gap:16px;margin-top:20px}.hero-actions .button{gap:13px;min-height:48px;padding:12px 16px;font-size:14px}.hero-actions .text-link{gap:8px;font-size:13px}.hero-actions .text-link svg{width:14px}.cinema-plane{aspect-ratio:1.36}.cinema-original{padding:20px 25px;display:block}.cinema-original .question-paper{max-width:285px;margin-inline:auto}.cinema-original .derivative-graph{height:100%;margin-top:0}.cinema-original .paper-stem{margin-top:7px;font-size:11px}.cinema-original .paper-question{margin-top:6px;font-size:11px}.cinema-original .paper-given{margin:0;font-size:17px}.source-note{display:none}.teaching-board{grid-template-columns:1fr .9fr;padding:15px 17px 0}.teaching-diagram{padding-right:10px}.teaching-diagram .paper-running-head{font-size:7px}.paper-running-head>span:first-child{font-size:13px}.teaching-diagram .derivative-graph{margin-top:0}.teaching-diagram .paper-given{margin-top:13px;font-size:14px}.teaching-working{padding:0 0 0 12px}.working-label{margin-bottom:9px;font-size:8px}.working-row{white-space:nowrap;margin-bottom:13px;font-size:12px}.working-row small{font-size:9px}.working-result{font-size:22px}.teaching-caption{gap:9px;margin-top:14px;padding-block:12px;font-size:10px;line-height:1.4}.audio-bars{gap:2px}.audio-bars i{width:1px}.cinema-final{padding-bottom:30px}.cinema-final .teaching-caption{padding-block:7px;font-size:9px}.cinema-demo-link{margin-top:0;font-size:10px}.film-edge{gap:8px;height:30px;padding-inline:12px;font-size:10px}.film-edge svg{width:13px}.cinema-controls{flex-direction:column;justify-content:start;min-height:57px;padding-right:0}.lesson-reveal-stage{margin-inline:-6px;height:min(440px,53svh);margin-bottom:34px}.lesson-player-controls{gap:5px;min-height:36px;padding:3px 8px;font-size:11px}.lesson-player-controls>.lesson-player-label{display:none}.grounded-proof-stage{height:min(420px,51svh);margin-inline:-6px}.grounded-proof-controls{flex-direction:column;gap:10px}.grounded-proof-controls>div{justify-content:space-between;gap:10px;width:100%}.grounded-proof-controls button{font-size:12px}.grounded-proof-controls .proof-playback{width:auto}.proof-caption{min-height:64px;font-size:13px}.grounded-proof-fallback{flex-direction:column;gap:10px}.grounded-proof-fallback svg{width:90%}.grounded-proof-fallback p{font-size:22px}.reveal-playback{margin-top:5px;position:static}.reveal-caption{text-align:center;flex-direction:column;gap:0;margin-top:8px;font-size:12px}.reveal-caption p{display:none}.cinema-controls ol{justify-content:space-between;gap:0;width:100%}.cinema-controls button{min-height:44px;padding-inline:7px;font-size:11px}.cinema-controls .reveal-playback button{border:0;width:44px}.benefit-strip{flex-direction:column;justify-content:start;gap:12px;margin-top:0;padding-block:17px;font-size:14px}.benefit-strip>span{gap:6px}.benefit-strip svg{width:13px}.workflow-section{margin-top:15px;padding-block:44px}.workflow-heading h2{font-size:32px;line-height:1.12}.workflow-heading>p{max-width:350px;margin-top:18px;font-size:16px}.workflow-art{height:min(410px,49svh);margin-top:8px;margin-bottom:4px}.workflow-book .book-artwork{aspect-ratio:1.4;width:96%}.book-page{padding:13px 12px}.page-topline{gap:6px;padding-bottom:10px;font-size:7px}.book-page h3{margin-top:25px;font-size:22px}.book-page>p:not(.paper-given){font-size:10px}.book-content-lines{gap:13px;margin-top:21px}.book-content-lines>div{gap:10px;font-size:8px}.book-page .derivative-graph{height:78px;margin-top:12px}.book-page .paper-given{font-size:10px}.book-question-rule{margin-top:10px}.book-page-number{padding-top:10px;font-size:8px}.parallel-questions{width:100%;padding-top:16px}.batch-origin{gap:7px;margin-bottom:14px;font-size:10px}.batch-origin-rule{width:28px}.batch-origin svg{width:14px}.batch-field{grid-template-columns:repeat(8,1fr);gap:6px;margin-bottom:-39px;padding:0}.batch-sheet{height:87px;padding:9px 4px}.batch-sheet:nth-child(n+9){display:none}.batch-sheet-header{margin-bottom:10px}.batch-sheet-header>span:last-child{display:none}.batch-sheet-result{margin-top:8px}.parallel-papers{gap:10px;width:94%}.parallel-paper{min-width:0;padding:12px 10px}.parallel-paper>.derivative-graph{height:102px}.parallel-math{white-space:nowrap;padding-block:2px 12px;font-size:10px}.parallel-paper-head{font-size:10px}.parallel-paper-head svg{width:13px}.parallel-paper>img{min-height:117px;margin:0}.parallel-paper-foot{gap:5px;min-height:28px;margin-top:7px;font-size:9px;line-height:1.4}.parallel-paper-foot svg{width:12px}.parallel-spine-label{margin-top:24px;font-size:11px}.parallel-production-caption{text-align:center;margin-top:10px;font-size:11px}.workflow-collection>p{gap:7px;margin-top:5px;font-size:11px}.workflow-copy{border-top:0;gap:12px;padding-top:0}.workflow-tabs{grid-template-columns:.85fr .7fr 1.25fr 1fr;gap:9px;display:grid}.workflow-tabs button{border-top:1px solid var(--line);min-height:50px;font-size:12px;line-height:1.3}.workflow-caption{min-height:172px}.workflow-caption h3{font-size:21px;line-height:1.2}.workflow-caption p{font-size:15px;line-height:1.5}.benchmark-section{padding-top:45px}.benchmark-layout{grid-template-columns:1fr;gap:28px}.benchmark-copy h2{margin:17px 0;font-size:37px}.benchmark-copy>p:not(.eyebrow){font-size:17px}.benchmark-copy>small{margin-top:18px;font-size:11px}.benchmark-results{grid-template-columns:1fr 1fr;gap:24px;display:grid}.exam-heading h3{min-height:38px;font-size:15px}.exam-heading p{font-size:13px}.exam-heading strong{font-size:47px}.exam-full{flex-wrap:wrap;gap:6px;font-size:10px}.exam-full>span:first-child{flex:auto;min-width:100%;height:3px;margin-bottom:4px}.exam-full svg{width:16px;height:16px}.benchmark-details{margin-top:4px}.benchmark-details summary{font-size:13px}.subject-results{grid-template-columns:1fr}.subject-result{gap:14px;font-size:14px}.flagship-section{padding-block:52px}.film-heading{margin-bottom:24px}.film-heading h2{margin-top:12px;font-size:33px}.film-heading>p{font-size:16px}.video-play{gap:8px;min-height:40px;padding:9px 12px;font-size:11px;bottom:10px;left:10px}.video-play svg{width:16px}.video-pause,.video-resume{width:38px;height:38px;top:10px;right:10px}.film-caption{padding-top:15px;font-size:11px;display:block}.film-caption>div{color:var(--accent-hover);flex-wrap:wrap;gap:15px;margin-top:8px}.delivery-section{padding-block:48px}.delivery-layout{grid-template-columns:1fr;gap:34px}.delivery-copy h2{font-size:34px}.delivery-copy>p{margin-top:20px;font-size:17px}.delivery-copy ul{margin-top:22px}.delivery-copy li{padding-block:13px;font-size:15px}.delivery-time{margin-bottom:4px}.delivery-time strong{font-size:67px}.delivery-time>span{font-size:15px}.delivery-book-stage{height:min(465px,57svh);margin-inline:-6px}.delivery-book:after{height:440px}.sat-result .exam-heading strong{font-size:40px}@media (prefers-reduced-motion:reduce){.delivery-book:after{display:none}}.delivery-book-controls{gap:5px}.delivery-book-controls p{margin-right:2px;font-size:13px}.delivery-book-controls button{width:44px;height:44px}.delivery-timing-note{margin-top:20px;font-size:11px}.supporting-section{gap:26px;padding-block:52px}.supporting-copy{display:block}.supporting-copy h2{font-size:32px}.supporting-copy p{margin-top:20px;font-size:16px}.supporting-video{width:100%}.supporting-video .video-play{min-height:40px;font-size:11px;bottom:10px;left:10px}.final-section{padding-block:49px}.final-layout{grid-template-columns:1fr;gap:30px}.final-copy h2{max-width:290px;font-size:36px}.final-copy>p{margin-top:18px;font-size:17px}.contact-email{margin-top:15px;font-size:16px}.demo-form-grid{gap:19px}.demo-form-grid label{font-size:14px}.contact-message>span{display:block}.contact-message small{margin-top:2px;font-size:11px;display:block}.demo-form-submit{margin-top:18px}.contact-privacy{font-size:11px}.site-footer{padding-block:30px;display:block}.site-footer nav{gap:15px 22px;margin-top:25px;font-size:12px}.site-footer>small{margin-top:22px;font-size:11px;display:block}}@media (max-width:359px){.hero h1{font-size:31px}.hero-actions{gap:8px}.hero-actions .text-link{font-size:12px}.hero-actions .button{padding-inline:12px;font-size:13px}.cinema-plane{aspect-ratio:1.22}.cinema-original{padding:16px 20px}.cinema-controls button{padding-inline:4px;font-size:10px}.book-page h3{font-size:18px}.workflow-tabs button{font-size:10px}.contact-message>span{font-size:13px}.working-row{font-size:10px}}@media (prefers-reduced-motion:reduce){.workflow-sticky:after{display:none}.workflow-composition{position:static}html{scroll-behavior:auto}*,:before,:after{transition:none!important;animation:none!important}.workflow-section{height:auto;padding-block:55px}.workflow-sticky{height:auto;min-height:0;max-height:none;position:static}.workflow-art{flex:auto;height:430px}.cinema-replay{display:none!important}.parallel-progress-fill{opacity:1;transform:scaleX(1)}}@media (max-width:599px) and (prefers-reduced-motion:reduce){.workflow-art{height:420px}}@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-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ease{syntax:"*";inherits:false}