:root{--teal:#087f8c;--aqua:#4cc6c9;--button:#39b7bd;--muted:#657078;--line:#dce6e9;--inset:#f7fbfc;--lift:0 2px 3px #183f4d0a,0 9px 19px -12px #183f4d42;--bevel:inset 0 1px 0 #ffffff,0 1px 2px #163f4b12,0 7px 15px -9px #163f4b55}
html{scroll-behavior:smooth;scroll-padding-top:104px}body{background:#f7fafb;padding:24px;color:#26343b}
.site{max-width:1240px;margin:auto;background:#fff;border:1px solid #dbe5e9;border-radius:16px;box-shadow:0 2px 4px #1b465312,0 22px 52px -30px #244d5e48;overflow:clip}
.header{position:sticky;top:0;z-index:20;background:#fff;height:84px;padding:0 38px;box-shadow:0 3px 8px -7px #1e4c5d66}.nav{gap:26px}.nav a:hover,.text-link:hover{color:var(--teal)}
.signin,.primary{display:inline-flex;align-items:center;justify-content:center;gap:22px;border-radius:8px;font:inherit;font-size:14px;font-weight:600;cursor:pointer;transition:transform .15s,box-shadow .15s}.signin{padding:11px 19px;border:1px solid #c5dce2;background:linear-gradient(#fff,#f7fcfd);color:#21535e;box-shadow:var(--bevel)}
.primary{padding:14px 21px;background:linear-gradient(180deg,#62d2d1,var(--button));color:#143c46;border:1px solid #32aeb6;box-shadow:inset 0 1px 0 #b9f2ef,0 2px 2px #14637526,0 8px 16px -9px #176a7b88}.primary:hover,.signin:hover{transform:translateY(-2px);box-shadow:inset 0 1px 0 #ffffffa6,0 3px 5px #183f4d14,0 11px 20px -10px #176a7b66}.primary:active,.signin:active{transform:translateY(1px)}
.hero{padding:54px 38px 48px;grid-template-columns:1fr 1.13fr;gap:45px}.hero h1{font-size:clamp(40px,4.7vw,59px);letter-spacing:-2.2px}.hero h1 em{color:var(--teal)}.intro{font-size:16px;line-height:1.7;max-width:430px;margin:23px 0 28px}.eyebrow{font-size:10px;letter-spacing:1.7px}.hero-actions{display:flex;align-items:center;flex-wrap:wrap;gap:22px}.text-link{font-size:13px;color:#536c76}
.video-placeholder{aspect-ratio:16/10;display:grid;place-items:center;width:100%;min-width:0;background:linear-gradient(145deg,#fff,#f5f9fb);border:1px solid #d6e4e9;border-radius:13px;box-shadow:inset 0 1px 0 #fff,0 3px 5px #204b5a0c,0 18px 28px -22px #204b5a88}.video-placeholder svg{width:48px;height:48px;fill:none;stroke:#84b8c3;stroke-width:1;opacity:.75}.video-placeholder polygon{fill:#bce8ea;stroke:#71b8c1}
.rail{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:0;margin:0;padding:0;border-radius:0;border-left:0;border-right:0;border-top:1px solid #9edce0;border-bottom:1px solid #a9d6dd;background:#fff;box-shadow:inset 0 1px 0 #fff,0 5px 11px -8px #184e6177;position:relative;z-index:1}.rail a{display:flex;align-items:center;justify-content:center;gap:10px;padding:20px 8px;font-size:14px;font-weight:500;border-right:1px solid #cfe6eb;min-height:64px;color:#24525f;background:linear-gradient(#fff,#f2fcfd);box-shadow:inset 0 1px 0 #fff;transition:background .15s,box-shadow .15s}.rail a:nth-child(2){background:linear-gradient(#edfcfc,#def5f6)}.rail a:nth-child(3){background:linear-gradient(#f7fefe,#eaf9fa)}.rail a:nth-child(4){background:linear-gradient(#e8fafa,#d6f0f3)}.rail a:last-child{border-right:0;background:linear-gradient(#f5fcff,#e5f4f8)}.rail a:hover{background:#dcf5f7;box-shadow:inset 0 -3px 0 var(--aqua)}
.icon{width:21px;height:21px;fill:none;stroke:var(--teal);stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex:none}
.section{padding:42px 38px;scroll-margin-top:95px}.section-head{display:grid;grid-template-columns:1fr 1fr;gap:8px 50px;align-items:end;margin-bottom:25px}.section-head .eyebrow{grid-column:1/-1;margin-bottom:4px}.section-head h2{font-size:30px;line-height:1.18;letter-spacing:-1px;font-weight:500;margin:0}.section-head>p:last-child{font-size:14px;line-height:1.65;color:var(--muted);margin:0;max-width:440px}
.notebook-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:13px}.notebook-grid article{display:grid;grid-template-columns:21px 1fr;align-content:start;gap:10px 9px;padding:17px 14px;background:linear-gradient(150deg,#fff,#fcfefe);border:1px solid #d7e5e9;border-top:2px solid #8bd4da;border-radius:9px;box-shadow:var(--lift);scroll-margin-top:105px}.notebook-grid .icon{width:20px;height:20px;align-self:center}.notebook-grid h3{font-size:15px;line-height:20px;letter-spacing:-.2px;font-weight:600;margin:0;align-self:center}.notebook-grid p{grid-column:1/-1;font-size:13px;line-height:1.6;color:var(--muted);margin:0}
.tool-section{margin:4px 22px 25px;padding:30px 23px;background:linear-gradient(145deg,#fff,#f8fcfd);border:1px solid #d7e5e9;border-radius:13px;box-shadow:0 2px 4px #163f4b0a,0 15px 25px -20px #204b5a66}.tool-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.tool-grid article{background:#fff;padding:20px;border:1px solid #d7e7ec;border-radius:9px;box-shadow:var(--lift)}.step{display:inline-flex;color:var(--teal);font-size:11px;font-weight:600;letter-spacing:1px;margin-bottom:13px;padding:6px 8px;background:#edfafa;border:1px solid #c8ecee;border-radius:5px;box-shadow:inset 0 1px 0 #fff}.tool-grid h3{font-size:16px;font-weight:600;margin:0 0 9px}.tool-grid p{font-size:13px;line-height:1.65;color:var(--muted);margin:0}
.closing{display:flex;justify-content:space-between;align-items:center;gap:24px;margin-top:24px;padding:22px;background:#fff;border:1px solid #d6e6eb;border-radius:9px;box-shadow:var(--lift)}.closing h3{font-size:19px;letter-spacing:-.4px;font-weight:500;margin:0 0 7px}.closing p{margin:0;font-size:13px;line-height:1.6;color:var(--muted)}.footer{padding:20px 38px;border-top:1px solid #e1eaed;margin:0;font-size:12px}
.auth-page{padding:0;background:#f7fafb;min-height:100svh}.auth-header{height:90px;padding:0 42px;background:#fff;border-bottom:1px solid #dce8ed;display:flex;align-items:center;justify-content:space-between;gap:20px;box-shadow:0 3px 8px -7px #1e4c5d66}.auth-main{padding:48px 22px}.auth-card{width:min(420px,100%);margin:0 auto;background:#fff;border:1px solid #d6e5ea;border-top:3px solid #7bd4d7;border-radius:12px;padding:32px 36px;box-shadow:0 2px 4px #244d5e12,0 18px 35px -22px #244d5e55}.auth-title{text-align:center;margin-bottom:27px}.auth-title img{margin-bottom:17px}.auth-title h1{font-size:29px;line-height:1.2;letter-spacing:-.8px;font-weight:500;margin:0 0 8px}.auth-title p{font-size:14px;color:var(--muted);margin:0}.auth-card .google{font-size:14px;display:flex;gap:12px;justify-content:center;align-items:center;padding:13px;border:1px solid #ccdee4;box-shadow:var(--bevel)}.google-letter{font-family:Arial,sans-serif;font-size:20px;font-weight:600;color:#375b67}.auth-card input{font-size:14px;padding:13px;background:#fcfefe;margin-bottom:19px}.auth-card label{font-size:13px;color:#364d57}.password-label{display:flex;justify-content:space-between;gap:15px}.password-label span{font-size:12px;color:var(--teal)}.auth-card .primary{width:100%;margin-top:3px;opacity:1}.auth-notice{display:none}button:focus-visible,a:focus-visible{outline:2px solid var(--teal);outline-offset:4px}button{font:inherit}
@media(max-width:1100px){.notebook-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.hero{gap:28px}.hero h1{font-size:47px}.rail a{font-size:13px;gap:8px}}
@media(max-width:800px){body{padding:12px}.header{padding:0 24px}.nav{gap:16px}.section-link{display:none}.hero{padding:36px 24px;grid-template-columns:1fr;gap:28px}.video-placeholder{max-width:560px;justify-self:center;aspect-ratio:16/9}.rail{grid-template-columns:repeat(3,minmax(0,1fr))}.rail a{padding:15px 8px;min-height:58px;border-bottom:1px solid #d0e6eb}.section{padding:33px 24px}.section-head{grid-template-columns:1fr;gap:14px}.section-head h2{font-size:28px}.notebook-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.tool-section{margin:3px 14px 22px;padding:25px 18px}.tool-grid{grid-template-columns:1fr}.closing{align-items:flex-start;flex-direction:column}.footer{padding:20px 24px}.auth-page{padding:0}.auth-header{height:80px;padding:0 22px}.auth-header .text-link{font-size:12px}.auth-main{padding-top:30px}.auth-card{padding:28px 25px}}
@media(max-width:460px){.brand{font-size:12px;gap:8px}.brand img{width:31px;height:39px}.signin{padding:10px 13px;gap:12px}.header{padding:0 19px}.hero h1{font-size:42px;letter-spacing:-1.8px}.intro{font-size:15px}.notebook-grid{grid-template-columns:1fr}.notebook-grid article{padding:15px 17px;gap:8px 10px}.rail{grid-template-columns:repeat(2,minmax(0,1fr))}.rail a:last-child{grid-column:1/-1}.rail a{justify-content:flex-start;padding-left:21px}.footer{flex-direction:column;gap:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}