.landing{--ink:#0e2233;--ink-2:#1d3a4d;--muted:#5c7079;--line:#e2eae5;--surface:#fff;--canvas:#f7faf7;--brand:#0f7059;--brand-bright:#16957a;--brand-tint:#e8f4ee;--lime:#d9f98e;--lime-deep:#52731f;--indigo:#4c5fd0;--indigo-tint:#eef0fc;--sand:#f2f6ec;--t-micro:clamp(11.5px, .14vw + 11.1px, 12.5px);--t-caption:clamp(12.5px, .18vw + 12px, 13.5px);--t-small:clamp(14px, .22vw + 13.4px, 15px);--t-body:clamp(15.5px, .32vw + 14.7px, 17px);--t-lead:clamp(17px, .5vw + 15.8px, 19.5px);--t-h3:clamp(20px, .7vw + 18.4px, 24px);--t-h2:clamp(31px, 2.6vw + 22px, 46px);--t-h1:clamp(41px, 4.6vw + 20px, 70px);--t-eyebrow:clamp(11px, .12vw + 10.7px, 12px);--ease:cubic-bezier(.22, 1, .36, 1);--ease-soft:cubic-bezier(.4, 0, .2, 1);--shadow-sm:0 2px 6px #0e223309, 0 1px 2px #0e22330a;--shadow-md:0 12px 28px -12px #0e223324, 0 3px 8px -4px #0e223314;--shadow-lg:0 30px 70px -28px #0e22332e, 0 8px 20px -12px #0e223318;background:var(--canvas);color:var(--ink);font-family:Instrument Sans,Segoe UI,sans-serif;font-size:var(--t-body);-webkit-font-smoothing:antialiased;text-rendering:optimizelegibility;line-height:1.65}.landing *,.landing :before,.landing :after{box-sizing:border-box}.landing [hidden]{display:none!important}.landing a{text-decoration:none}.landing button,.landing input{font:inherit}.landing button,.landing summary{cursor:pointer}.landing ::selection{background:var(--lime);color:var(--ink)}.landing :focus-visible{outline:3px solid var(--brand-bright);outline-offset:5px}.landing section,.landing #pratonton{scroll-margin-top:100px}.landing svg{flex-shrink:0}.landing-container{width:min(1216px,100% - 96px);margin-inline:auto}.landing-skip{z-index:100;background:var(--ink);color:#fff;font-size:var(--t-small);border-radius:10px;padding:12px 20px;position:fixed;top:-100px;left:16px}.landing-skip:focus{top:16px}.landing[data-motion=on] [data-reveal]{opacity:0;transition:opacity .72s var(--ease), transform .72s var(--ease);transition-delay:var(--reveal-delay,0s);will-change:opacity, transform;transform:translateY(22px)}.landing[data-motion=on] [data-reveal].is-visible{opacity:1;transform:none}@keyframes landing-enter{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}@keyframes landing-float{0%,to{transform:var(--float-base) translateY(0)}50%{transform:var(--float-base) translateY(-9px)}}@keyframes landing-spin{to{transform:translate(-50%,-50%)rotate(360deg)}}@keyframes landing-pulse{0%,to{box-shadow:0 0 0 4px var(--brand-tint)}50%{box-shadow:0 0 0 7px #e1eddd66}}@keyframes landing-fade-up{0%{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}.landing-header{z-index:40;-webkit-backdrop-filter:blur(20px)saturate(140%);backdrop-filter:blur(20px)saturate(140%);transition:box-shadow .3s var(--ease-soft), background .3s var(--ease-soft);background:#f7faf7e8;border-bottom:1px solid #e2e9e3a6;position:sticky;top:0}.landing-header.is-stuck{background:#f7faf7f5;box-shadow:0 1px #dfe8e1,0 12px 30px -22px #0e223333}.header-inner{justify-content:space-between;align-items:center;gap:28px;height:84px;display:flex}.landing-logo{color:var(--ink);letter-spacing:-1.2px;align-items:center;font-size:clamp(24px,.5vw + 22px,28px);font-weight:600;line-height:1;display:inline-flex}.logo-symbol{background:linear-gradient(140deg, var(--ink) 0%, #23485c 100%);width:36px;height:36px;color:var(--lime);transition:transform .42s var(--ease);border-radius:11px;justify-content:center;align-items:center;margin-right:10px;display:inline-flex;transform:rotate(-6deg)}.landing-logo:hover .logo-symbol{transform:rotate(6deg)scale(1.06)}.logo-symbol svg{stroke-width:2.8px;width:25px;height:25px;transform:rotate(6deg)}.logo-ai{background:linear-gradient(100deg, var(--brand) 10%, var(--brand-bright) 90%);color:#0000;-webkit-background-clip:text;background-clip:text}.logo-dot{color:var(--brand-bright)}.desktop-nav{align-items:center;gap:30px;display:flex}.desktop-nav a,.login-link{color:#4d626b;font-size:var(--t-caption);transition:color .2s var(--ease-soft);padding-block:12px;font-weight:500;position:relative}.desktop-nav a:after{content:"";background:linear-gradient(90deg, var(--brand), var(--brand-bright));transform-origin:0;width:100%;height:2px;transition:transform .32s var(--ease);border-radius:2px;position:absolute;bottom:6px;left:0;transform:scaleX(0)}.desktop-nav a:hover:after{transform:scaleX(1)}.desktop-nav a:hover,.login-link:hover{color:var(--brand)}.header-actions{align-items:center;gap:24px;display:flex}.landing-button{min-height:52px;font-size:var(--t-caption);letter-spacing:-.1px;transition:background .24s var(--ease-soft), transform .26s var(--ease), box-shadow .26s var(--ease), border-color .24s var(--ease-soft);white-space:nowrap;border:1px solid #0000;border-radius:12px;justify-content:center;align-items:center;gap:12px;padding:14px 24px;font-weight:600;line-height:1.5;display:inline-flex;position:relative;overflow:hidden}.landing-button svg{width:18px;height:18px;transition:transform .32s var(--ease);position:relative}.landing-button>*{position:relative}.landing-button:after{content:"";width:45%;transition:left .7s var(--ease);background:linear-gradient(100deg,#0000,#ffffff40,#0000);position:absolute;inset:0 auto 0 -60%;transform:skew(-18deg)}.landing-button:hover{transform:translateY(-2px)}.landing-button:hover:after{left:115%}.landing-button:hover svg{transform:translate(3px)}.landing-button:active{transform:translateY(0)}.button-dark{background:linear-gradient(135deg, var(--ink) 0%, #21455a 100%);color:#fff;box-shadow:var(--shadow-sm)}.button-dark:hover{box-shadow:0 14px 30px -14px #0e223366}.button-dark:disabled{opacity:.48;cursor:not-allowed;box-shadow:none;transform:none}.button-dark:disabled:after{display:none}.button-outline{color:var(--ink);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);background:#ffffffb0;border-color:#d5e0d9}.button-outline:hover{border-color:var(--brand-bright);color:var(--brand);box-shadow:var(--shadow-md);background:#fff}.button-lime{background:linear-gradient(135deg, var(--lime) 0%, #c3f06d 100%);color:#22371a;box-shadow:0 12px 30px -16px #a8d95f80}.button-lime:hover{box-shadow:0 18px 38px -16px #a8d95fa0}.button-small{min-height:44px;font-size:var(--t-micro);padding:11px 18px}.mobile-menu{display:none;position:relative}.mobile-menu summary{border:1px solid var(--line);width:44px;height:44px;transition:border-color .2s var(--ease-soft), background .2s var(--ease-soft);background:#ffffffb0;border-radius:11px;place-items:center;list-style:none;display:grid}.mobile-menu summary:hover{border-color:var(--brand-bright);background:#fff}.mobile-menu summary::-webkit-details-marker{display:none}.faq-item summary::-webkit-details-marker{display:none}.mobile-menu summary svg{width:20px;height:20px}.mobile-menu nav{border:1px solid var(--line);min-width:240px;box-shadow:var(--shadow-lg);animation:landing-fade-up .22s var(--ease) both;background:#fff;border-radius:16px;padding:10px;position:absolute;top:56px;right:0}.mobile-menu nav a{color:var(--ink);font-size:var(--t-small);transition:background .18s var(--ease-soft), color .18s var(--ease-soft);border-radius:9px;padding:13px;display:block}.mobile-menu nav a:hover{background:var(--brand-tint);color:var(--brand)}.hero-section{background:radial-gradient(60% 55% at 84% 55%,#ddeee4 0,#0000 62%),radial-gradient(50% 45% at 12% 12%,#eef1fb 0,#0000 58%);padding:40px 0 84px;position:relative;overflow:hidden}.audience-picker{justify-content:center;align-items:center;gap:18px;margin-bottom:54px;display:flex}.audience-label{font-size:var(--t-micro);color:var(--muted)}.audience-tabs{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);box-shadow:var(--shadow-sm);background:#fff8;border:1px solid #dfe7e0;border-radius:14px;gap:4px;padding:5px;display:inline-flex}.audience-tab{min-height:44px;font-size:var(--t-caption);color:#55686d;transition:background .26s var(--ease), color .26s var(--ease-soft), box-shadow .26s var(--ease), transform .26s var(--ease);border-radius:10px;justify-content:center;align-items:center;gap:8px;padding:10px 22px;font-weight:500;display:flex}.audience-tab svg{width:18px;height:18px;transition:transform .3s var(--ease)}.audience-tab[aria-selected=true]{color:var(--ink);background:#fff;box-shadow:0 4px 12px -4px #0e223326,0 0 0 1px #dce5da}.audience-tab[aria-selected=true] svg{color:var(--brand);transform:scale(1.08)}.audience-tab:hover{color:var(--brand)}.hero-grid{grid-template-columns:1.03fr 1fr;align-items:center;gap:70px;display:grid}.hero-copy{padding-bottom:2px}.eyebrow{font-size:var(--t-eyebrow);letter-spacing:1.9px;color:var(--brand);align-items:center;gap:9px;font-weight:700;line-height:1.7;display:flex}.status-dot,.tiny-dot{background:var(--brand-bright);border-radius:50%;flex-shrink:0;width:7px;height:7px}.status-dot{box-shadow:0 0 0 4px var(--brand-tint);animation:landing-pulse 2.8s var(--ease-soft) infinite}.hero-copy h1{font-size:var(--t-h1);letter-spacing:-3px;margin-top:22px;font-weight:500;line-height:1.08}.hero-copy h1 span{background:linear-gradient(100deg, var(--brand) 0%, var(--brand-bright) 55%, #3fae86 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landing-spin;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.visual-orbit:before,.visual-orbit:after{content:"";border:1px solid #d1dfc86b;border-radius:50%;position:absolute;inset:25px}.visual-orbit:after{inset:-27px}.preview-window{box-shadow:var(--shadow-lg);transition:transform .5s var(--ease), box-shadow .5s var(--ease);background:#fff;border:1px solid #dce5dc;border-radius:20px;position:relative;overflow:hidden}.hero-visual:hover .preview-window{transform:translateY(-4px);box-shadow:0 40px 80px -30px #0e223338,0 10px 24px -14px #0e22331c}.preview-topbar{color:#78868b;height:44px;font-size:var(--t-micro);border-bottom:1px solid #edf0eb;justify-content:space-between;align-items:center;padding-inline:18px;display:flex}.preview-topbar>svg{width:15px;height:15px}.window-dots{gap:5px;display:flex}.window-dots i{background:#dce4dc;border-radius:50%;width:7px;height:7px}.window-dots i:first-child{background:var(--brand-bright)}.preview-body{padding:24px}.preview-heading{justify-content:space-between;align-items:center;gap:12px;display:flex}.preview-overline{color:#6f8288;letter-spacing:1.5px;font-size:var(--t-micro);font-weight:700}.preview-heading h2{letter-spacing:-.6px;margin-top:5px;font-size:clamp(17px,.5vw + 15.8px,20px);font-weight:600;line-height:1.4}.preview-app-icon{background:var(--brand-tint);color:var(--brand);border-radius:12px;place-items:center;width:42px;height:42px;display:grid}.preview-app-icon svg{width:22px;height:22px}.quiz-meta{color:#6f8288;font-size:var(--t-micro);align-items:center;gap:10px;margin-top:22px;display:flex}.soft-badge{background:var(--sand);color:var(--lime-deep);font-size:var(--t-micro);white-space:nowrap;border-radius:7px;align-items:center;padding:6px 10px;font-weight:600;line-height:1.4;display:inline-flex}.demo-label{font-size:var(--t-micro);margin-left:auto}.landing fieldset{border:0;min-width:0;margin:21px 0 0;padding:0}.landing legend{width:100%;font-size:var(--t-lead);font-weight:500;line-height:2.4;display:block}.fraction{vertical-align:middle;font-size:var(--t-body);text-align:center;flex-direction:column;margin-inline:5px;line-height:1.15;display:inline-flex}.fraction span:first-child{border-bottom:1.5px solid;padding:0 4px 3px}.fraction span:last-child{padding:3px 4px 0}.quiz-options{grid-template-columns:1fr 1fr;gap:10px;margin-top:16px;display:grid}.quiz-option{min-height:56px;font-size:var(--t-small);cursor:pointer;transition:background .22s var(--ease-soft), border-color .22s var(--ease-soft), transform .22s var(--ease), box-shadow .22s var(--ease);background:#fdfefd;border:1px solid #e4e9e2;border-radius:11px;align-items:center;gap:12px;padding:11px 13px;display:flex;position:relative}.quiz-option input{opacity:0;width:1px;height:1px;position:absolute}.quiz-option:has(input:focus-visible){outline:3px solid 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var(--brand);background:#fff}.quiz-option[data-result=correct]{background:#eaf7f0;border-color:#35916a}.quiz-option[data-result=incorrect]{background:#fff5ee;border-color:#c58864}.quiz-option:has(input:disabled){cursor:default;transform:none}.quiz-bottom{justify-content:space-between;align-items:center;gap:13px;margin-top:22px;display:flex}.quiz-bottom>span{color:#74868a;font-size:var(--t-micro);max-width:170px}.quiz-bottom .landing-button{font-size:var(--t-micro);gap:9px;min-height:42px;padding:10px 15px}.quiz-bottom .landing-button svg{width:15px;height:15px}.quiz-feedback{background:var(--brand-tint);color:#1c5a44;font-size:var(--t-caption);animation:landing-fade-up .32s var(--ease) both;border-radius:11px;margin-top:14px;padding:13px 15px;line-height:1.7}.quiz-feedback[data-result=incorrect]{color:#7c5122;background:#fff4e8}.preview-noscript{font-size:var(--t-caption);padding-top:12px;line-height:1.7}.preview-footer{min-height:50px;font-size:var(--t-micro);color:#5e7264;background:linear-gradient(#f6f9f3 0%,#f2f7ee 100%);border-top:1px solid #e9eee5;justify-content:center;align-items:center;gap:16px;padding:11px;display:flex}.preview-footer span{align-items:center;gap:6px;display:flex}.preview-footer svg{width:14px;height:14px}.preview-footer-arrow{color:#9db894}.floating-note{--float-base:rotate(3deg);z-index:2;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);box-shadow:var(--shadow-md);animation:landing-float 7s var(--ease-soft) infinite;background:#fffffff5;border:1px solid #e1e8db;border-radius:14px;align-items:center;gap:12px;padding:13px 18px 13px 13px;display:flex;position:absolute}.note-top{top:-3px;right:-22px;transform:rotate(3deg)}.note-bottom{--float-base:rotate(-3deg);animation-delay:1.4s;bottom:9px;left:-25px;transform:rotate(-3deg)}.note-icon{background:var(--brand-tint);width:36px;height:36px;color:var(--brand);border-radius:10px;place-items:center;display:grid}.note-icon svg{width:20px;height:20px}.lime-icon{background:linear-gradient(140deg, var(--lime) 0%, #c9f27c 100%);color:var(--lime-deep)}.floating-note strong{font-size:var(--t-caption);font-weight:700;display:block}.floating-note div>span{color:#75868b;font-size:var(--t-micro);margin-top:3px;display:block}.mini-spark{color:#6fa04e;margin-left:13px;font-size:30px}.visual-caption{text-align:center;color:#74878c;width:100%;font-size:var(--t-micro);letter-spacing:.2px;position:absolute;bottom:-25px}.teacher-stats{grid-template-columns:repeat(3,1fr);gap:9px;margin-top:22px;display:grid}.teacher-stats>div{transition:transform .3s var(--ease);background:linear-gradient(160deg,#f6f9f3 0%,#f1f6ec 100%);border:1px solid #e8ede2;border-radius:11px;padding:16px 12px;position:relative}.teacher-stats>div:hover{transform:translateY(-3px)}.teacher-stats svg{width:16px;height:16px;color:var(--brand);margin-bottom:8px}.teacher-stats strong{letter-spacing:-.8px;font-size:clamp(20px,.6vw + 18.6px,23px);font-weight:600;line-height:1.3;display:block}.teacher-stats span{font-size:var(--t-micro);color:#6f8279;margin-top:5px;display:block}.paper-preview{border:1px solid #e3e9df;border-radius:12px;margin-top:16px;padding:15px}.paper-heading,.paper-heading>div{align-items:center;gap:11px;display:flex}.paper-heading{justify-content:space-between}.paper-heading strong{font-size:var(--t-caption);font-weight:700}.paper-heading div div>span{color:#75868b;font-size:var(--t-micro);margin-top:4px;display:block}.paper-icon{background:var(--sand);color:#5f7d6e;border:1px solid #e2e9db;border-radius:9px;place-items:center;width:36px;height:36px;display:grid}.paper-icon svg{width:18px;height:18px}.paper-stages{font-size:var(--t-micro);color:#66787a;border-top:1px solid #edf0e7;flex-wrap:wrap;gap:9px 14px;margin-top:14px;padding-top:14px;display:flex}.paper-stages span{align-items:center;gap:5px;display:flex}.paper-stages svg{width:12px;height:12px;color:var(--brand-bright)}.mastery-preview{margin-top:20px}.mastery-preview>div:first-child{justify-content:space-between;align-items:center;gap:10px;margin-bottom:15px;display:flex}.mastery-preview strong{font-size:var(--t-micro);font-weight:600}.mastery-preview>div:first-child>span{color:#77888c;font-size:var(--t-micro)}.mastery-row{font-size:var(--t-micro);color:#6c7e80;grid-template-columns:82px 1fr 32px;align-items:center;gap:12px;margin-top:11px;display:grid}.mastery-row>div{background:#ecf1e8;border-radius:10px;height:7px;overflow:hidden}.mastery-row i{height:100%;width:var(--mastery);background:linear-gradient(90deg, var(--brand) 0%, var(--brand-bright) 100%);border-radius:inherit;display:block}.mastery-row:nth-child(3) i{background:linear-gradient(90deg,#86a94e 0%,#a9c46a 100%)}.subject-strip{border-block:1px solid var(--line);background:#fff}.subject-inner{align-items:center;gap:44px;padding-block:30px;display:flex}.subject-inner>p{border-right:1px solid var(--line);font-size:var(--t-micro);color:#77878a;flex-shrink:0;padding-right:36px;line-height:1.7}.subject-inner strong{color:var(--ink-2);font-weight:600}.subject-items{flex-wrap:wrap;flex:1;justify-content:space-between;align-items:center;gap:18px;display:flex}.subject-items>span{font-size:var(--t-caption);color:#56706a;transition:color .22s var(--ease-soft);align-items:center;gap:10px;font-weight:500;display:flex}.subject-items>span:hover{color:var(--brand)}.subject-items svg{color:#86a08f;width:19px;height:19px;transition:color .22s var(--ease-soft), transform .3s 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