:root{--bg: #ffffff;--page-bg: #ffffff;--surface: #ffffff;--nav-bg: rgba(255, 255, 255, .94);--surface-gray: #f6f8fb;--surface-green: #effaf8;--surface-dark: #111821;--text: #14171f;--muted: #4e5a6a;--accent: #028f80;--accent-orange: #ff5a00;--accent-dark: #006b68;--accent-soft: #e2f3f1;--icon-reader-book: #009b8a;--icon-author: #d0186a;--icon-publisher: #1557e5;--icon-library: #7c2ce8;--icon-university: #1d4ed8;--icon-government: #4f46e5;--icon-public: #b11245;--icon-reader: #008575;--icon-web-reader: #0078c8;--icon-epub-file: #1557e5;--icon-research: #0089a8;--icon-program: #8a1ee8;--icon-sale: #5d8c00;--icon-rental: #b87900;--icon-charity: #b11245;--icon-coins: #a85c00;--icon-dollars: #a04700;--icon-fan: #d41470;--icon-security: #9b111e;--icon-access: #b87900;--icon-no-ads: #d0182f;--border: #d8dee8;--border-strong: #b8c3d1;--focus-ring: 0 0 0 3px rgba(2, 143, 128, .18);--card-bg: #ffffff;--card-tint: var(--surface-gray);--button-light-bg: #ffffff;--button-green-bg: var(--accent-orange);--button-green-hover-bg: var(--text);--button-green-hover-shadow: none;--button-control-height: 42px;--button-left-curve-width: 96px;--button-row-gap: calc(var(--button-control-height) * .6);--nav-button-height: 30px;--nav-button-gap: calc(var(--nav-button-height) * .6);--card-good-reveal-offset: clamp(36px, 4.5vw, 72px);--shadow-soft: 0 14px 32px rgba(15, 23, 42, .07);--shadow-hover: 0 18px 38px rgba(15, 23, 42, .1);--card-green-shadow: 0 0 18px rgba(2, 143, 128, .14);--radius-card: 8px;--radius-control: 0 999px 999px 0;--section-gap: 18px;--section-padding: 64px;--section-stack-gap: calc(var(--section-padding) * 2);--card-grid-gap: calc(var(--section-gap) * 1.5);--gray-edge-air: clamp(36px, 4vw, 72px);--green-edge-air-top-wave-a: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201440%20560%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22white%22%20d%3D%22M0%200%20H1440%20V70%20C1360%2010%201300%20290%201210%20210%20C1095%20110%201030%20270%20930%20170%20C850%2090%20840%20300%20760%20350%20C650%20430%20570%20320%20470%20230%20C335%20140%20290%20410%20190%20330%20C100%20260%2070%20500%200%20430%20Z%22%2F%3E%3C%2Fsvg%3E);--green-edge-air-top-wave-b: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201440%20560%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22white%22%20d%3D%22M0%200%20H1440%20V96%20C1350%2032%201315%20250%201218%20170%20C1110%2080%201070%20310%20955%20230%20C830%20150%20805%20420%20650%20300%20C535%20205%20455%2078%20330%20180%20C210%20295%20150%20530%200%20452%20Z%22%2F%3E%3C%2Fsvg%3E);--green-edge-air-top-wave-c: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201440%20560%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22white%22%20d%3D%22M0%200%20H1440%20V54%20C1348%20150%201290%2016%201184%20120%20C1046%20246%20995%20132%20860%20188%20C720%20248%20660%2042%20526%20154%20C390%20270%20350%20520%20212%20386%20C112%20292%2074%20482%200%20420%20Z%22%2F%3E%3C%2Fsvg%3E);--green-edge-air-top-wave-d: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201440%20560%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22white%22%20d%3D%22M0%200%20H1440%20V118%20C1302%2052%201264%20300%201136%20216%20C990%20122%20942%20330%20816%20252%20C702%20186%20668%2088%20548%20174%20C400%20280%20350%20420%20234%20308%20C122%20198%2080%20520%200%20474%20Z%22%2F%3E%3C%2Fsvg%3E);--green-edge-air-top-wave-e: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201440%20560%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22white%22%20d%3D%22M0%200%20H1440%20V82%20C1358%2028%201302%20206%201192%20156%20C1080%20108%201022%20272%20904%20244%20C760%20210%20734%20454%20598%20320%20C470%20194%20436%2092%20302%20232%20C190%20350%20128%20458%200%20398%20Z%22%2F%3E%3C%2Fsvg%3E);--green-edge-air-top-wave-f: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201440%20560%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22white%22%20d%3D%22M0%200%20H1440%20V42%20C1328%20116%201280%20248%201170%20182%20C1045%20108%201020%2062%20882%20142%20C752%20220%20700%20395%20590%20276%20C468%20148%20390%20360%20260%20292%20C150%20232%2092%20500%200%20460%20Z%22%2F%3E%3C%2Fsvg%3E);--green-edge-air-top-wave-g: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201440%20560%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22white%22%20d%3D%22M0%200%20H1440%20V104%20C1368%2068%201310%2018%201218%2092%20C1088%20196%201038%20310%20920%20226%20C778%20126%20720%20348%20584%20238%20C470%20150%20420%20466%20304%20368%20C186%20270%20130%20340%200%20500%20Z%22%2F%3E%3C%2Fsvg%3E);--green-edge-air-top-wave-h: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201440%20560%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22white%22%20d%3D%22M0%200%20H1440%20V66%20C1336%20190%201298%2088%201168%20156%20C1060%20212%201018%2040%20890%20132%20C752%20234%20690%20512%20546%20334%20C448%20214%20382%20286%20264%20216%20C154%20154%2092%20430%200%20410%20Z%22%2F%3E%3C%2Fsvg%3E);--green-edge-air-bottom-wave-a: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201440%20560%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22white%22%20d%3D%22M0%20470%20C110%20380%20185%20530%20330%20430%20C420%20370%20500%20300%20610%20385%20C760%20500%20780%20230%20940%20310%20C1080%20380%201125%20110%201275%20210%20C1360%20270%201390%2090%201440%20130%20L1440%20560%20H0%20Z%22%2F%3E%3C%2Fsvg%3E);--green-edge-air-bottom-wave-b: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201440%20560%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22white%22%20d%3D%22M0%20520%20C130%20390%20210%20310%20348%20438%20C474%20552%20520%20286%20668%20368%20C792%20438%20830%20170%20970%20276%20C1115%20386%201162%20230%201278%20152%20C1364%2094%201408%20186%201440%2072%20L1440%20560%20H0%20Z%22%2F%3E%3C%2Fsvg%3E);--green-edge-air-bottom-wave-c: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201440%20560%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22white%22%20d%3D%22M0%20438%20C96%20328%20182%20562%20316%20462%20C424%20380%20488%20166%20604%20300%20C734%20452%20798%20350%20928%20250%20C1058%20150%201112%20392%201242%20258%20C1348%20148%201378%2042%201440%20102%20L1440%20560%20H0%20Z%22%2F%3E%3C%2Fsvg%3E);--green-edge-air-bottom-wave-d: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201440%20560%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22white%22%20d%3D%22M0%20492%20C116%20548%20176%20330%20294%20408%20C438%20506%20502%20238%20626%20346%20C748%20454%20790%20114%20934%20208%20C1044%20280%201126%20448%201248%20286%20C1338%20166%201390%20238%201440%2086%20L1440%20560%20H0%20Z%22%2F%3E%3C%2Fsvg%3E);--green-edge-air-bottom-wave-e: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201440%20560%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22white%22%20d%3D%22M0%20456%20C88%20374%20132%20290%20262%20360%20C390%20430%20454%20548%20576%20424%20C712%20284%20760%20354%20890%20298%20C1034%20236%201068%2074%201196%20178%20C1308%20268%201362%20128%201440%20156%20L1440%20560%20H0%20Z%22%2F%3E%3C%2Fsvg%3E);--green-edge-air-bottom-wave-f: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201440%20560%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22white%22%20d%3D%22M0%20506%20C124%20418%20196%20504%20320%20382%20C426%20278%20488%20460%20596%20404%20C742%20328%20810%2086%20948%20194%20C1082%20298%201132%20376%201256%20242%20C1344%20146%201398%2044%201440%20116%20L1440%20560%20H0%20Z%22%2F%3E%3C%2Fsvg%3E);--green-edge-air-bottom-wave-g: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201440%20560%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22white%22%20d%3D%22M0%20424%20C102%20528%20172%20408%20288%20488%20C420%20578%20480%20218%20622%20326%20C744%20418%20828%20312%20936%20364%20C1064%20426%201098%20132%201234%20224%20C1328%20288%201382%2078%201440%2096%20L1440%20560%20H0%20Z%22%2F%3E%3C%2Fsvg%3E);--green-edge-air-bottom-wave-h: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20viewBox%3D%220%200%201440%20560%22%20preserveAspectRatio%3D%22none%22%3E%3Cpath%20fill%3D%22white%22%20d%3D%22M0%20540%20C116%20430%20182%20198%20330%20326%20C448%20428%20514%20520%20642%20382%20C770%20246%20800%20438%20946%20286%20C1064%20164%201120%2092%201248%20170%20C1360%20238%201390%20178%201440%2048%20L1440%20560%20H0%20Z%22%2F%3E%3C%2Fsvg%3E);--green-edge-air-top-wave: var(--green-edge-air-top-wave-a);--green-edge-air-bottom-wave: var(--green-edge-air-bottom-wave-a);--green-edge-top-wave-width: 100%;--green-edge-bottom-wave-width: 100%;--green-edge-top-wave-x: 50%;--green-edge-bottom-wave-x: 50%;--card-heading-font-size: 1.35rem;--card-heading-line-height: var(--line-height-heading);--card-inline-icon-size: calc(var(--card-heading-font-size) * 1.7);--card-icon-column: var(--card-inline-icon-size);--card-icon-gap: 12px;--icon-size: 56px;--icon-stroke-width: 2;--page-max: 1180px;--hero-image-reader-ratio: .8326316;--hero-image-reader-height: 450px;--hero-solution-copy-size: 1.375rem;--hero-problem-copy-size: calc(var(--hero-solution-copy-size) * .9);--book-background-image: url(/images/background.webp);--book-background-ratio: .4462745;--font-body: "Manrope", system-ui, sans-serif;--font-display: "Poppins", system-ui, sans-serif;--font-heading: var(--font-display);--font-ui: var(--font-display);--font-weight-heading: 500;--font-weight-ui: 400;--line-height-heading: 1.16;--line-height-body: 1.5;--letter-spacing-heading: -.025rem;--motion-ease: cubic-bezier(.22, 1, .36, 1);--motion-fast: .18s;--motion-base: .22s;--motion-deliberate: .34s;--motion-reveal: .62s;--motion-hero-media-reveal: 744ms;--motion-hero: 1.24s}*{box-sizing:border-box;margin:0;padding:0}html{overflow-x:clip;scroll-padding-top:98px}body{position:relative;min-height:100vh;font-family:var(--font-body);color:var(--text);background-color:var(--page-bg);line-height:var(--line-height-body);overflow-x:clip}body.page-home{--green-edge-air-top-wave: var(--green-edge-air-top-wave-a);--green-edge-air-bottom-wave: var(--green-edge-air-bottom-wave-a)}body.page-about{--green-edge-air-top-wave: var(--green-edge-air-top-wave-b);--green-edge-air-bottom-wave: var(--green-edge-air-bottom-wave-c)}body.page-authors{--green-edge-air-top-wave: var(--green-edge-air-top-wave-c);--green-edge-air-bottom-wave: var(--green-edge-air-bottom-wave-e)}body.page-booktree{--green-edge-air-top-wave: var(--green-edge-air-top-wave-d);--green-edge-air-bottom-wave: var(--green-edge-air-bottom-wave-g)}body.page-contact{--green-edge-air-top-wave: var(--green-edge-air-top-wave-e);--green-edge-air-bottom-wave: var(--green-edge-air-bottom-wave-b)}body.page-institutions{--green-edge-air-top-wave: var(--green-edge-air-top-wave-f);--green-edge-air-bottom-wave: var(--green-edge-air-bottom-wave-d)}body.page-kb{--green-edge-air-top-wave: var(--green-edge-air-top-wave-g);--green-edge-air-bottom-wave: var(--green-edge-air-bottom-wave-f)}body.page-platform{--green-edge-air-top-wave: var(--green-edge-air-top-wave-h);--green-edge-air-bottom-wave: var(--green-edge-air-bottom-wave-h)}body.page-pricing{--green-edge-air-top-wave: var(--green-edge-air-top-wave-a);--green-edge-air-bottom-wave: var(--green-edge-air-bottom-wave-d)}body.page-scribe{--green-edge-air-top-wave: var(--green-edge-air-top-wave-b);--green-edge-air-bottom-wave: var(--green-edge-air-bottom-wave-f)}body.page-security{--green-edge-air-top-wave: var(--green-edge-air-top-wave-c);--green-edge-air-bottom-wave: var(--green-edge-air-bottom-wave-h)}body.page-webuzz{--green-edge-air-top-wave: var(--green-edge-air-top-wave-d);--green-edge-air-bottom-wave: var(--green-edge-air-bottom-wave-a)}body.page-wepub{--green-edge-air-top-wave: var(--green-edge-air-top-wave-e);--green-edge-air-bottom-wave: var(--green-edge-air-bottom-wave-c)}body.page-weread{--green-edge-air-top-wave: var(--green-edge-air-top-wave-f);--green-edge-air-bottom-wave: var(--green-edge-air-bottom-wave-e)}body.page-wetalk{--green-edge-air-top-wave: var(--green-edge-air-top-wave-g);--green-edge-air-bottom-wave: var(--green-edge-air-bottom-wave-b)}body.page-terms{--green-edge-air-top-wave: var(--green-edge-air-top-wave-h);--green-edge-air-bottom-wave: var(--green-edge-air-bottom-wave-g)}a{color:var(--accent)}:where(a,button,input,textarea,select):focus-visible{outline:0;box-shadow:var(--focus-ring)}img,svg{max-width:100%}button,input,textarea,select{font:inherit}h1,h2,h3,h4{font-family:var(--font-heading);font-weight:var(--font-weight-heading);line-height:var(--line-height-heading);letter-spacing:var(--letter-spacing-heading);color:var(--text)}h1{font-size:clamp(1.893375rem,3.9933vw,3.3564375rem)}h2{font-size:clamp(1.8rem,2.88vw,2.88rem)}h3{font-size:clamp(1.25rem,1.8vw,1.55rem)}p{color:var(--muted)}body .content :is(ul,ol):not(.platform-flow):not(.flow-chain),body .content :is(ul,ol):not(.platform-flow):not(.flow-chain) li{text-align:left!important}.page{position:relative;z-index:1;width:100%;max-width:var(--page-max);margin:0 auto;padding:32px 24px 0}.content{display:block}.nav{position:sticky;top:0;z-index:900;display:flex;align-items:center;justify-content:space-between;gap:0;padding:12px 0 20px;margin-bottom:0;background:var(--nav-bg);backdrop-filter:blur(16px);isolation:isolate}.nav:before,.nav:after{content:"";position:absolute;left:calc(50% - 50vw);width:100vw;z-index:-1}.nav:before{top:-32px;height:calc(100% + 32px);background:var(--nav-bg)}.nav:after{bottom:0;height:1px;background:var(--border)}.nav-brand,.nav-actions,.nav-links,.nav-links li{display:flex;align-items:center}.nav-brand{gap:10px;min-width:0}.site-logo{width:44px;height:44px;object-fit:contain;flex:0 0 auto}.nav-logo,.nav-logo-link{font-family:var(--font-ui);font-weight:500;font-size:1.375rem;letter-spacing:var(--letter-spacing-heading);color:var(--accent);text-decoration:none}.nav-links{position:absolute;left:50%;transform:translate(-50%);gap:10px;list-style:none;white-space:nowrap}.nav-links a,.nav-dropdown-toggle{display:inline-flex;align-items:center;gap:6px;min-height:34px;padding:7px 10px;border:1px solid transparent;border-radius:var(--radius-control);background:transparent;color:var(--text);font-family:var(--font-ui);font-size:.875rem;font-weight:var(--font-weight-ui);line-height:var(--line-height-heading);text-decoration:none;cursor:pointer;transition:border-color var(--motion-fast) ease,color var(--motion-fast) ease,background var(--motion-fast) ease}.nav-links a:hover,.nav-dropdown-toggle:hover{color:var(--accent-orange);border-color:transparent}.nav-links a.is-active,.nav-dropdown--active>.nav-dropdown-toggle{color:var(--accent-orange);font-weight:400}.nav-links>li>a.is-active{pointer-events:none;cursor:default}.nav-dropdown{position:relative}.nav-dropdown:after{content:"";position:absolute;top:100%;left:50%;width:190px;height:12px;transform:translate(-50%)}.nav-dropdown-toggle:after{content:"";width:6px;height:6px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:translateY(-2px) rotate(45deg)}.nav-dropdown-menu{position:absolute;top:calc(100% 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