:root{color-scheme:light;--ink:#172b26;--muted:#536b61;--forest:#1f4d43;--forest-deep:#153b34;--forest-soft:#e5efea;--paper:#fffefa;--canvas:#f5f7f2;--line:#d9e3db;--accent:#edaa48;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans KR",sans-serif;font-synthesis:none}
*{box-sizing:border-box}body{margin:0;background:var(--canvas);color:var(--ink)}a{color:inherit;text-underline-offset:4px}button,input,select{font:inherit}a:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:5px;border-radius:5px}img{display:block}h1,h2,h3,p{margin:0}p{line-height:1.75}h1,h2,h3{overflow-wrap:anywhere}h1{font-size:clamp(2.25rem,4.5vw,4rem);font-weight:650;line-height:1.15;letter-spacing:-.045em}h2{font-size:clamp(1.5rem,2.8vw,2.2rem);font-weight:620;line-height:1.3;letter-spacing:-.035em}h3{font-size:1.18rem;font-weight:620;line-height:1.4;letter-spacing:-.015em}.page-width,.header-inner,.footer-inner{width:min(1120px,calc(100% - 64px));margin-inline:auto}.skip-link{position:fixed;inset-block-start:8px;inset-inline-start:8px;z-index:10;padding:12px 18px;background:var(--forest);color:white;transform:translateY(-150%)}.skip-link:focus{transform:none}.site-header{border-bottom:1px solid var(--line);background:var(--paper)}.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:86px}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;white-space:nowrap;font-size:1.12rem;font-weight:650;letter-spacing:-.02em}.brand img{border-radius:10px}.header-nav{display:flex;align-items:center;gap:26px;font-size:.9rem}.header-nav>a:first-child{text-decoration:none}.button{display:inline-flex;align-items:center;justify-content:center;gap:20px;min-height:50px;padding:14px 23px;border:1px solid var(--forest);border-radius:10px;background:var(--forest);color:#fff;text-decoration:none;font-size:.95rem;font-weight:600;line-height:1.4;text-align:center}.button:hover{background:var(--forest-deep)}.button-small{min-height:44px;padding:11px 16px;font-size:.87rem}.button-secondary{background:var(--paper);color:var(--forest);border-color:#b9cbc0}.button-secondary:hover{background:var(--forest-soft)}.language-menu{position:relative}.language-menu summary{display:flex;align-items:center;gap:9px;min-height:44px;cursor:pointer;list-style:none}.language-menu summary::-webkit-details-marker{display:none}.language-options{position:absolute;z-index:5;inset-block-start:calc(100% + 10px);inset-inline-end:0;width:260px;max-height:60vh;overflow:auto;border:1px solid var(--line);border-radius:12px;padding:8px;background:var(--paper);box-shadow:0 12px 30px #163b3420}.language-link{display:flex;justify-content:space-between;align-items:center;gap:10px;min-height:44px;padding:10px 12px;text-decoration:none;border-radius:7px}.language-link:hover,.language-link[aria-current]{background:var(--forest-soft)}.language-link small,.language-card small{font-size:.7rem;background:var(--forest-soft);padding:3px 6px;border-radius:5px}.lead{font-size:1.08rem;color:var(--muted);line-height:1.8}.small-note{font-size:.82rem;line-height:1.7;color:var(--muted)}.hero{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:64px;padding-block:88px 92px}.hero-copy h1{max-width:560px}.hero-intro{font-size:1.2rem;margin-block:24px 8px;color:var(--forest)}.hero-copy .lead{max-width:460px;font-size:1rem}.actions{display:flex;flex-wrap:wrap;gap:12px;margin-block:29px 18px}.hero-copy .small-note{max-width:440px}.notebook-preview{margin:0;min-width:0;transform:rotate(1.5deg);border:1px solid #c4d4c8;border-radius:15px;background:#e9efe8;box-shadow:0 22px 46px #254c371a;overflow:hidden}.notebook-preview figcaption{display:flex;align-items:center;gap:11px;padding:18px 20px;background:var(--paper);border-bottom:1px solid var(--line);font-size:.83rem;font-weight:600}.notebook-preview figcaption small{display:block;margin-top:4px;color:var(--muted);font-size:.65rem;font-weight:400}.preview-icon{font-size:1.6rem;color:var(--forest)}.preview-dots{margin-inline-start:auto;color:var(--muted);letter-spacing:2px}.preview-workspace{padding:25px 37px 29px}.preview-page{min-height:300px;position:relative;isolation:isolate;background:var(--paper);padding:38px 30px 38px;border:1px solid #d9e0d6;box-shadow:0 3px 10px #17392b0a}.preview-page h2{font-size:1.38rem;font-weight:580;letter-spacing:-.025em;line-height:1.45;max-width:230px}.preview-page p{font-size:.85rem;margin-block-start:21px;color:#567163;line-height:2;background:linear-gradient(transparent 49%,#f1eab180 49%,#f1eab180 95%,transparent 95%)}.paper-lines{position:absolute;inset:0;z-index:-1;background:repeating-linear-gradient(transparent,transparent 27px,#dfe9df55 28px);opacity:.5}.annotation{display:flex;align-items:center;gap:8px;color:#8e6042;font-size:.81rem;font-style:italic;transform:rotate(-3deg);margin-block-start:23px}.annotation span{font-size:1.7rem}.page-number{position:absolute;inset-block-end:13px;inset-inline-start:50%;color:var(--muted);font-size:.7rem}.preview-tools{display:flex;justify-content:center;flex-wrap:wrap;gap:5px;padding:12px;background:var(--paper);border-top:1px solid var(--line);font-size:.66rem;color:var(--muted)}.preview-tools>span{display:flex;align-items:center;gap:6px;padding:8px 9px;border-radius:7px}.preview-tools .tool-active{color:var(--forest);background:var(--forest-soft)}.tool-symbol{font-size:1rem}.feature-section{padding-block:54px 72px;border-block-start:1px solid var(--line)}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:42px;margin-block-start:35px}.feature-symbol{display:grid;place-items:center;width:42px;height:42px;margin-block-end:18px;border-radius:10px;background:var(--forest-soft);color:var(--forest);font-size:1.5rem}.feature-grid p{font-size:.93rem;color:var(--muted);margin-block-start:10px}.steps-section{padding-block:55px 65px;border-block-start:1px solid var(--line)}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:35px;counter-reset:step;padding:0;margin-block:32px 0;list-style:none}.steps li{position:relative;padding-inline-start:47px;counter-increment:step}.steps li::before{content:counter(step);position:absolute;inset-inline-start:0;inset-block-start:0;display:grid;place-items:center;width:32px;height:32px;border:1px solid #afc3b6;border-radius:50%;color:var(--forest);font-size:.85rem}.steps p{margin-block-start:8px;font-size:.9rem;color:var(--muted)}.privacy-section{display:grid;grid-template-columns:1.6fr 1fr;align-items:center;gap:65px;background:var(--forest-soft);border:1px solid #d3e0d5;border-radius:16px;padding:43px 45px}.privacy-section h2{font-size:1.75rem}.privacy-section p{margin-block-start:15px;font-size:.91rem;color:var(--muted)}.privacy-links{display:grid;gap:16px}.text-link{color:var(--forest);font-weight:550;font-size:.9rem;line-height:1.7}.text-link span{margin-inline-start:5px}.final-section{padding-block:75px 83px;text-align:center}.final-section p{margin-block:14px 23px;color:var(--muted)}.site-footer{border-block-start:1px solid var(--line);background:var(--paper)}.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:25px;padding-block:34px}.footer-brand{font-weight:600;text-decoration:none}.footer-inner p{font-size:.76rem;color:var(--muted);margin-block-start:5px}.footer-inner nav{display:flex;flex-wrap:wrap;gap:12px 25px;font-size:.78rem;color:var(--muted)}.footer-inner nav a{text-decoration:none}.document-main{padding-block:61px 76px}.document-heading{max-width:860px;margin-block-end:42px}.document-heading h1{font-size:clamp(2.15rem,4vw,3.25rem)}.document-heading .lead{margin-block-start:21px;max-width:770px}.document-heading .small-note{margin-block-start:17px}.document-layout{display:grid;grid-template-columns:220px minmax(0,760px);gap:55px;align-items:start}.contents{position:sticky;inset-block-start:25px;display:grid;gap:3px;border-inline-start:1px solid var(--line);padding-inline-start:16px}.contents a{padding-block:10px;line-height:1.5;font-size:.85rem;color:var(--muted);text-decoration:none}.contents a:hover{color:var(--forest);text-decoration:underline}.document-body{min-width:0;background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:34px 37px}.document-body section{scroll-margin-block-start:25px;margin-block-end:36px;padding-block-end:31px;border-block-end:1px solid var(--line)}.document-body h2{font-size:1.35rem;letter-spacing:-.02em}.document-body p{font-size:.94rem;margin-block-start:14px;overflow-wrap:anywhere;color:#40584d}.document-body .text-link{display:inline-block;margin-block-start:15px}.document-body .small-note{font-size:.8rem;color:var(--muted)}.document-action{display:flex;justify-content:start}.chooser-main{padding-block:80px 90px;min-height:calc(100vh - 195px)}.chooser-main h1{font-size:clamp(2.3rem,4vw,3.3rem)}.chooser-main .lead{margin-block-start:18px}.language-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:13px;margin-block:37px 24px}.language-card{display:flex;align-items:center;gap:10px;min-height:70px;padding:18px;border:1px solid var(--line);border-radius:11px;background:var(--paper);text-decoration:none;font-size:1rem}.language-card:hover{border-color:#91b29e;background:#edf4ed}.language-arrow{margin-inline-start:auto;color:var(--muted)}[dir=rtl] .notebook-preview{transform:rotate(-1.5deg)}[dir=rtl] h1,[dir=rtl] h2,[dir=rtl] h3{letter-spacing:normal}
@media(max-width:1000px){.hero{gap:36px;padding-block:65px}.hero h1{font-size:3rem}.preview-workspace{padding:20px}.preview-page{padding:28px 24px;min-height:290px}.feature-grid{gap:26px}.privacy-section{gap:32px;padding:33px}.header-nav{gap:19px}.document-layout{grid-template-columns:185px minmax(0,1fr);gap:30px}.document-body{padding:28px}.language-grid{grid-template-columns:repeat(3,1fr)}}
@media(max-width:760px){.page-width,.header-inner,.footer-inner{width:calc(100% - 40px)}.header-inner{min-height:76px;gap:14px}.brand{font-size:1rem;gap:8px}.brand img{width:30px;height:30px}.header-nav{gap:14px;font-size:.82rem}.header-nav>.button{display:none}.hero{grid-template-columns:1fr;gap:43px;padding-block:48px 55px}.hero h1{font-size:clamp(2.4rem,9vw,3.3rem);max-width:540px}.hero-copy .lead,.hero-copy .small-note{max-width:540px}.hero-intro{margin-block-start:20px}.notebook-preview{max-width:500px;width:100%;margin-inline:auto;transform:rotate(.7deg)}.preview-workspace{padding:25px 32px}.preview-page{min-height:280px;padding:28px 32px}.preview-page h2{max-width:100%;font-size:1.35rem}.preview-page p{font-size:.92rem;max-width:360px}.feature-section{padding-block:39px 46px}.feature-grid{grid-template-columns:1fr;gap:30px;margin-block-start:28px}.feature-grid article{position:relative;padding-inline-start:59px}.feature-symbol{position:absolute;inset-inline-start:0;inset-block-start:0}.feature-grid p{margin-block-start:7px}.steps-section{padding-block:38px 45px}.steps{grid-template-columns:1fr;gap:25px}.privacy-section{grid-template-columns:1fr;gap:25px;padding:27px 24px}.privacy-section h2{font-size:1.6rem}.privacy-links{gap:12px}.final-section{padding-block:52px 57px}.final-section h2{font-size:1.7rem}.footer-inner{align-items:start;flex-direction:column;padding-block:28px}.footer-inner nav{gap:15px 20px;line-height:1.7}.document-main{padding-block:42px 48px}.document-heading{margin-block-end:29px}.document-layout{grid-template-columns:1fr;gap:28px}.contents{position:static;display:flex;flex-wrap:wrap;gap:2px 19px;padding-inline-start:0;border:0;padding-block-end:15px;border-block-end:1px solid var(--line)}.contents a{padding-block:5px}.document-body{padding:25px 23px}.document-body section{margin-block-end:29px;padding-block-end:26px}.language-grid{grid-template-columns:repeat(2,1fr)}.chooser-main{padding-block:48px}.language-card{padding:15px;gap:7px}}
@media(max-width:380px){.page-width,.header-inner,.footer-inner{width:calc(100% - 28px)}.header-nav{gap:12px}.brand{font-size:.92rem}.actions{flex-direction:column}.actions .button{width:100%}.preview-workspace{padding:18px}.preview-page{padding:26px 22px}.preview-tools{gap:0;padding:7px}.preview-tools>span{padding:8px 7px}.language-grid{grid-template-columns:1fr}.document-body{padding:23px 19px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}
@media print{.site-header,.site-footer,.contents,.document-action,.language-menu{display:none}.document-main{width:100%;padding:0}.document-layout{display:block}.document-body{padding:0;border:0;background:white}.document-body section{break-inside:avoid}body{background:white}}