:root{--blue:#1769e0;--blue-dark:#124da8;--navy:#10284b;--text:#26364b;--muted:#6e7f95;--pale:#eef5ff;--line:#dfe8f5;--white:#fff;--shadow:0 18px 50px rgba(28,74,136,.09);--radius:20px}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);background:#fff;line-height:1.6}a{color:inherit;text-decoration:none}button,input,textarea,select{font:inherit}button,a,input,textarea,select{outline-color:#7cb0ff}button{cursor:pointer}.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.95);backdrop-filter:blur(14px);border-bottom:1px solid #eaf0f8;display:flex;align-items:center;justify-content:space-between;padding:13px clamp(18px,5vw,76px);gap:24px;min-height:78px}.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}.brand-mark{width:43px;height:43px;border-radius:14px;background:linear-gradient(135deg,#2783ff,#1552bd);color:white;display:grid;place-items:center;font-weight:850;font-size:23px;box-shadow:0 7px 18px #1769e033}.brand strong{display:block;font-size:19px;line-height:1.15;color:var(--navy);letter-spacing:-.5px}.brand small{display:block;font-size:10px;color:var(--muted);letter-spacing:.35px;margin-top:3px}.nav{display:flex;align-items:center;gap:5px}.nav a{padding:9px 11px;border-radius:10px;font-size:13px;font-weight:650;color:#52647c;white-space:nowrap;transition:.2s}.nav a:hover,.nav a.active{background:#edf4ff;color:var(--blue)}.mobile-menu{display:none;border:1px solid var(--line);background:#fff;border-radius:10px;padding:7px 12px;font-size:21px;color:var(--navy)}
.hero{padding:76px clamp(22px,8vw,120px) 66px;display:grid;grid-template-columns:1.1fr .9fr;align-items:center;gap:48px;overflow:hidden;background:radial-gradient(ellipse at 82% 38%,#e7f1ff 0,transparent 39%),linear-gradient(180deg,#fff,#f9fbff)}.hero-copy{max-width:660px}.eyebrow{font-size:11px;letter-spacing:1.8px;font-weight:800;color:var(--blue);display:inline-block}.hero h1{font-size:clamp(42px,5vw,70px);letter-spacing:-3px;line-height:1.06;color:var(--navy);margin:18px 0}.hero h1 span{color:var(--blue)}.hero-copy>p{font-size:17px;line-height:1.8;color:#687b94;max-width:580px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin:27px 0 23px}.button{border:0;border-radius:12px;padding:12px 18px;font-weight:750;font-size:14px;display:inline-flex;align-items:center;justify-content:center;gap:12px;transition:transform .18s,box-shadow .18s}.button:hover{transform:translateY(-2px)}.button.primary{color:#fff;background:linear-gradient(135deg,#2581ff,#1556c3);box-shadow:0 8px 18px #1769e02a}.button.secondary{color:var(--blue-dark);background:white;border:1px solid #cdddf5}.button.small{padding:9px 15px}.button.full{width:100%}.trust-row{display:flex;gap:17px;flex-wrap:wrap;color:#71819a;font-size:11px;font-weight:650}.trust-row span:first-letter{color:#168d6b}.hero-art{height:365px;position:relative;display:grid;place-items:center}.orbit{position:absolute;border:1px solid #c8dcfb;border-radius:50%;width:300px;height:300px}.orbit-two{width:390px;height:390px;border-style:dashed;opacity:.7}.book-illustration{position:relative;z-index:2;width:180px;height:140px;filter:drop-shadow(0 20px 24px #1758a92a);transform:rotate(-8deg)}.book-page{position:absolute;left:4px;top:14px;width:87px;height:112px;background:linear-gradient(145deg,#fff,#dbeaff);border:2px solid #b9d2f5;border-radius:9px 4px 4px 9px;transform:skewY(-7deg)}.book-page:after{content:"";position:absolute;left:16px;right:13px;top:26px;height:3px;background:#92b8f1;box-shadow:0 15px #bad1f1,0 30px #bad1f1,0 45px #bad1f1}.book-page.right{left:89px;background:linear-gradient(135deg,#fff,#c3dcff);border-radius:4px 9px 9px 4px;transform:skewY(7deg)}.book-illustration>span{position:absolute;z-index:4;right:26px;top:-28px;color:#f4b642;font-size:42px}.floating-card{position:absolute;z-index:3;background:#fff;border:1px solid #e5edfa;box-shadow:var(--shadow);border-radius:15px;padding:13px;display:flex;align-items:center;gap:10px;min-width:175px}.floating-card b,.floating-card small{display:block}.floating-card b{font-size:12px;color:var(--navy)}.floating-card small{font-size:10px;color:var(--muted);margin-top:3px}.card-one{top:40px;left:0}.card-two{right:-3px;bottom:42px}.mini-icon{width:34px;height:34px;border-radius:11px;background:#e4f9f0;color:#12936b;display:grid;place-items:center;font-weight:900}.mini-icon.blue{background:#eaf2ff;color:var(--blue)}
.section{padding:65px clamp(22px,8vw,120px)}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:25px}.section-heading h2,.study-panel h2,.account-promo h2{font-size:clamp(27px,3vw,38px);letter-spacing:-1.3px;line-height:1.18;color:var(--navy);margin:9px 0}.section-heading>p{font-size:13px;color:var(--muted);max-width:320px}.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.feature-card{border:1px solid var(--line);border-radius:17px;padding:23px 20px;min-height:218px;transition:.2s;background:#fff}.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#b7d0f6}.feature-icon{width:43px;height:43px;border-radius:13px;display:grid;place-items:center;background:#edf4ff;color:var(--blue);font-size:23px;font-weight:700}.feature-card h3{font-size:17px;color:var(--navy);margin:18px 0 6px}.feature-card p{font-size:12px;line-height:1.7;color:var(--muted);min-height:42px}.card-link{font-size:12px;color:var(--blue);font-weight:800}.study-section{padding-top:10px}.study-panel{display:grid;grid-template-columns:.85fr 1.15fr;gap:60px;background:#f3f7ff;border:1px solid #e6eefb;border-radius:24px;padding:clamp(24px,4vw,50px)}.study-panel>div:first-child p,.account-promo>p{color:var(--muted);font-size:14px;line-height:1.8}.tips-list{display:grid;gap:18px}.tips-list article{display:flex;gap:16px}.tips-list article>span{font-size:13px;font-weight:850;color:var(--blue);background:white;border:1px solid #d8e6fb;border-radius:10px;width:42px;height:42px;display:grid;place-items:center;flex-shrink:0}.tips-list h3{margin:0 0 3px;font-size:14px;color:var(--navy)}.tips-list p{margin:0;color:var(--muted);font-size:12px}.question-section{padding-top:35px}.search-panel{border:1px solid var(--line);border-radius:18px;padding:22px;background:#fff}.search-box{display:flex;align-items:center;gap:12px;border:1px solid #dce7f7;background:#f9fbff;border-radius:13px;padding:7px 8px 7px 14px}.search-box>span{font-size:26px;color:var(--blue)}.search-box input{border:0;outline:0;background:transparent;flex:1;min-width:0;padding:8px;color:var(--text)}.chips{display:flex;gap:9px;flex-wrap:wrap;margin-top:15px}.chip{border:1px solid #dce7f7;background:#fff;border-radius:30px;padding:7px 13px;font-size:11px;color:#52647c;font-weight:650}.chip:hover{background:#edf4ff;color:var(--blue)}.muted,.hint{color:var(--muted);font-size:12px}.library-section{padding-top:30px}.library-content{min-height:150px}.empty-state{text-align:center;border:1px dashed #cfdef3;border-radius:18px;padding:35px 20px;background:#fbfdff}.empty-symbol{font-size:28px;color:var(--blue)}.empty-state h3{color:var(--navy);margin:8px 0 3px}.empty-state p{color:var(--muted);font-size:13px;margin:0}.class-grid,.resource-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:13px}.class-card,.resource-card{border:1px solid var(--line);border-radius:14px;padding:17px;background:white;text-align:left;transition:.2s}.class-card:hover,.resource-card:hover{border-color:#9ebff2;box-shadow:var(--shadow);transform:translateY(-2px)}.class-card strong{display:block;color:var(--navy);font-size:15px}.class-card span,.resource-card p{display:block;color:var(--muted);font-size:11px;margin-top:5px}.resource-card h3{margin:8px 0;color:var(--navy);font-size:15px}.tag{display:inline-block;background:#eaf2ff;color:#1558bd;border-radius:20px;padding:4px 8px;font-size:10px;font-weight:800}.resource-card .resource-content{font-size:13px;white-space:pre-wrap;color:#40516a;line-height:1.7}.resource-card details{margin-top:10px;font-size:12px}.resource-card summary{cursor:pointer;color:var(--blue);font-weight:750}.account-section{display:grid;grid-template-columns:1fr minmax(300px,.8fr);gap:45px;align-items:center;background:#f8fbff}.account-promo ul{padding-left:19px;color:#566a83;font-size:13px;line-height:2}.auth-card{background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);border-radius:20px;padding:24px}.auth-tabs{display:flex;background:#f1f5fb;border-radius:11px;padding:4px;margin-bottom:20px}.auth-tab{flex:1;border:0;background:transparent;padding:10px;border-radius:8px;color:var(--muted);font-size:13px;font-weight:750}.auth-tab.active{background:#fff;color:var(--blue);box-shadow:0 2px 8px #173f7110}.auth-card form label,.admin-form>label,.form-grid label{display:block;font-size:12px;font-weight:750;color:#42546c;margin-bottom:14px}.auth-card input,.admin-form input,.admin-form textarea,.admin-form select{display:block;width:100%;border:1px solid #dce5f2;border-radius:10px;padding:11px 12px;margin-top:6px;background:#fff;color:var(--text);font-size:13px}.turnstile-wrap{margin:12px 0}.hint{font-weight:400}.text-button{border:0;background:none;color:var(--blue);font-size:12px;font-weight:750;margin-top:12px;padding:5px 0}.form-message{font-size:12px;color:#176b52;min-height:18px}.form-message.error{color:#b42318}.signed-in-panel{border:1px solid var(--line);border-radius:13px;padding:15px}.hidden{display:none!important}.admin-section{background:#fbfdff}.admin-form{background:#fff;border:1px solid var(--line);border-radius:18px;padding:22px}.form-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:13px}.admin-form .inline-check{display:flex;align-items:center;gap:8px}.admin-form .inline-check input{width:auto;margin:0}.admin-resources{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;margin-top:20px}.site-footer{background:#0d2344;color:#d5e2f5;padding:36px clamp(22px,8vw,120px) 18px}.footer-main{display:flex;align-items:center;gap:28px;flex-wrap:wrap;padding-bottom:25px}.footer-brand strong{color:#fff}.footer-brand small{color:#9db4d4}.footer-main>p{color:#9db4d4;font-size:12px;margin-right:auto}.footer-links{display:flex;gap:16px;flex-wrap:wrap}.footer-links a,.footer-bottom{font-size:11px;color:#a8bdd9}.footer-bottom{border-top:1px solid #28405f;padding-top:15px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}.toast{position:fixed;right:20px;bottom:20px;z-index:200;background:#10284b;color:white;padding:12px 17px;border-radius:12px;box-shadow:var(--shadow);font-size:13px;max-width:min(420px,calc(100vw - 40px));opacity:0;pointer-events:none;transform:translateY(10px);transition:.2s}.toast.show{opacity:1;transform:translateY(0)}
@media(max-width:1100px){.nav{gap:0}.nav a{font-size:12px;padding:8px}.hero{padding-top:55px}.feature-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:800px){.site-header{padding:11px 18px;min-height:68px}.mobile-menu{display:block}.nav{display:none;position:absolute;top:67px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:12px 16px 17px;box-shadow:0 16px 24px #10284b10;grid-template-columns:repeat(2,1fr)}.nav.open{display:grid}.nav a{padding:11px}.hero{grid-template-columns:1fr;padding:50px 24px 38px;gap:8px}.hero-art{height:260px}.orbit{width:220px;height:220px}.orbit-two{width:280px;height:280px}.book-illustration{transform:scale(.8) rotate(-8deg)}.card-one{left:2px;top:15px}.card-two{right:0;bottom:12px}.section{padding:44px 22px}.section-heading{align-items:start;flex-direction:column;gap:0}.study-panel{grid-template-columns:1fr;gap:28px}.account-section{grid-template-columns:1fr;gap:20px}.class-grid,.resource-grid{grid-template-columns:repeat(2,1fr)}.form-grid{grid-template-columns:repeat(2,1fr)}.admin-resources{grid-template-columns:1fr}}
@media(max-width:480px){.hero h1{letter-spacing:-2px;font-size:43px}.hero-copy>p{font-size:15px}.trust-row{gap:8px 12px}.floating-card{min-width:150px;padding:9px}.floating-card b{font-size:11px}.floating-card small{font-size:9px}.feature-grid{gap:10px}.feature-card{padding:16px;min-height:205px}.feature-card h3{font-size:15px}.feature-card p{font-size:11px}.search-box{flex-wrap:wrap}.search-box input{width:calc(100% - 60px)}.search-box .button{width:100%}.class-grid,.resource-grid,.form-grid{grid-template-columns:1fr}.auth-card{padding:17px}.footer-main{gap:14px}.footer-links{gap:12px}.footer-bottom{flex-direction:column}}