/* SELLFORGE landing page, in the demo shop's look (theme/startrees/assets/sein.css): warm paper, ink,
   the table colour behind the screens, Pretendard. No script. */
:root{
  --name:#161513;--ink:#1f1e1b;--ink2:#3a3833;--sub:#4f4c46;--muted:#6c685f;
  --line:#e4e0d8;--line-strong:#d3cec4;--paper:#fbfaf7;--band:#f3f0ea;--table:#e7dfd2;
  --accent:#a84c26;--wrap:1160px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"Pretendard Variable",Pretendard,-apple-system,BlinkMacSystemFont,system-ui,"Apple SD Gothic Neo","Malgun Gothic",sans-serif;font-size:16px;line-height:1.75;letter-spacing:-.01em;word-break:keep-all;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}
h1,h2,h3,p,ul,ol,dl,dd,figure{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%;height:auto}
picture{display:block}
:focus-visible{outline:2px solid var(--name);outline-offset:3px}
.wrap{width:min(var(--wrap),calc(100% - 48px));margin:0 auto}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:12px;top:-60px;z-index:10;padding:8px 14px;background:var(--ink);color:#fff}
.skip:focus{top:12px}

.top{position:sticky;top:0;z-index:5;background:var(--paper);border-bottom:1px solid var(--line)}
.top-row{height:64px;display:flex;align-items:center;gap:40px}
.logo{font-size:18px;font-weight:800;letter-spacing:.16em;color:var(--name);white-space:nowrap}
.top-nav{display:flex;gap:28px;margin-right:auto;font-size:14.5px;color:var(--ink2)}
.top-nav a:hover{color:var(--name)}
.top-demo{padding:8px 16px;border:1px solid var(--name);font-size:14px;font-weight:600;color:var(--name);white-space:nowrap}
.top-demo:hover{background:var(--name);color:#fff}

.label{margin:0 0 18px;font-size:12.5px;font-weight:600;letter-spacing:.16em;color:var(--sub)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:50px;padding:0 26px;border:1px solid var(--name);color:var(--name);font-size:15px;font-weight:600;line-height:1.2;transition:background-color .15s,color .15s}
.btn:hover{background:var(--name);color:#fff}
.btn.main{background:var(--name);color:#fff}
.btn.main:hover{background:#000;border-color:#000}
.btn.light{border-color:rgba(255,255,255,.6);color:#fff}
.btn.light:hover{border-color:#fff;background:#fff;color:var(--name)}
.actions{display:flex;flex-wrap:wrap;gap:10px}

.hero{padding:88px 0 56px}
.hero h1{font-size:64px;font-weight:700;line-height:1.16;letter-spacing:-.045em;color:var(--name)}
.hero-row{display:flex;align-items:flex-end;justify-content:space-between;gap:40px;margin-top:36px}
.lead{max-width:34em;font-size:17.5px;line-height:1.8;color:var(--sub)}
.hero-row .actions{flex:0 0 auto}

/* The screens sit across the line where the paper meets the table colour. */
.showcase{background:linear-gradient(var(--paper) 0 34%,var(--table) 34% 100%);padding-bottom:88px}
.showcase-row{position:relative}
.browser{overflow:hidden;border:1px solid rgba(31,30,27,.12);border-radius:10px;background:#fff;box-shadow:0 24px 60px -24px rgba(31,30,27,.28)}
.browser-bar{display:flex;align-items:center;justify-content:center;height:38px;border-bottom:1px solid var(--line);background:#f6f4ef}
.browser-bar span{padding:3px 22px;border-radius:6px;background:#fff;font-size:12.5px;color:var(--muted);letter-spacing:0}
.phone{position:absolute;right:-28px;bottom:-56px;width:212px;overflow:hidden;border:7px solid var(--ink);border-radius:30px;background:var(--ink);box-shadow:0 24px 50px -18px rgba(31,30,27,.45)}
.phone img{border-radius:23px}

.section{padding:112px 0}
.band{background:var(--band)}
.head h2{font-size:40px;font-weight:700;line-height:1.28;letter-spacing:-.04em;color:var(--name)}
.meta{margin-top:12px;font-size:14.5px;color:var(--muted)}

.case{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);gap:64px;margin-top:48px;align-items:start}
.case-lead{font-size:19px;line-height:1.7;color:var(--ink);letter-spacing:-.02em}
.note{margin-top:16px;padding-left:14px;border-left:2px solid var(--line-strong);font-size:14.5px;color:var(--muted)}
.facts{margin-top:32px;border-top:1px solid var(--ink)}
.facts div{display:grid;grid-template-columns:72px minmax(0,1fr);gap:16px;padding:15px 0;border-bottom:1px solid var(--line)}
.facts dt{font-size:14.5px;font-weight:700;color:var(--name)}
.facts dd{font-size:15px;line-height:1.7;color:var(--ink2)}
.case .actions{margin-top:32px}
.case-shots{display:grid;gap:28px}
.case-shots img{border:1px solid var(--line);border-radius:8px;background:#fff;box-shadow:0 18px 40px -26px rgba(31,30,27,.35)}
figcaption{margin-top:10px;font-size:13.5px;color:var(--muted)}

.split{display:grid;grid-template-columns:minmax(0,4fr) minmax(0,7fr);gap:64px}
.index{border-top:1px solid var(--ink)}
.index li{display:grid;grid-template-columns:180px minmax(0,1fr);gap:24px;padding:24px 0;border-bottom:1px solid var(--line-strong)}
.index h3,.cost-list h3,.steps h3{font-size:17px;font-weight:700;letter-spacing:-.02em;color:var(--name)}
.index p,.cost-list p,.steps p{font-size:15px;line-height:1.75;color:var(--ink2)}

.cost{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:64px;margin-top:48px}
.figure{margin-bottom:18px;font-size:56px;font-weight:700;line-height:1.1;letter-spacing:-.04em;color:var(--accent)}
.cost-figure>p:last-child{font-size:16.5px;line-height:1.85;color:var(--ink2)}
.cost-list{border-top:1px solid var(--ink)}
.cost-list li{padding:22px 0;border-bottom:1px solid var(--line)}
.cost-list p{margin-top:6px}

.steps{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:20px;margin-top:48px}
.steps li{padding-top:18px;border-top:1px solid var(--ink)}
.steps p{margin-top:8px;font-size:14.5px}
.stack{margin-top:64px;padding-top:24px;border-top:1px solid var(--line-strong);font-size:15px;line-height:1.9;color:var(--ink2)}
.stack span{display:inline-block;margin-right:16px;font-weight:700;color:var(--name)}

.contact{background:var(--ink);color:#e9e4db;padding:104px 0}
.contact-row{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:64px;align-items:end}
.contact .label{color:#b8b1a5}
.contact h2{font-size:38px;font-weight:700;line-height:1.3;letter-spacing:-.04em;color:#fff}
.contact p{font-size:16.5px;line-height:1.85;color:#d8d2c7}
.contact .mail{margin-top:22px}
.contact .mail span{display:block;margin-bottom:2px;font-size:13px;font-weight:600;letter-spacing:.12em;color:#b8b1a5}
.contact .mail .address{display:block;font-size:26px;font-weight:600;letter-spacing:-.02em;color:#fff;overflow-wrap:anywhere}
.contact .mail a{font-size:26px;font-weight:600;letter-spacing:-.02em;color:#fff;text-decoration:underline;text-underline-offset:6px;text-decoration-thickness:1px;text-decoration-color:rgba(255,255,255,.4);overflow-wrap:anywhere}
.contact .mail a:hover{text-decoration-color:#fff}
.contact .actions{margin-top:28px}
.btn.white{border-color:#fff;background:#fff;color:var(--name)}
.btn.white:hover{background:transparent;color:#fff}
.foot a{color:#e9e4db;text-decoration:underline;text-underline-offset:3px;text-decoration-color:rgba(233,228,219,.35)}
.foot a:hover{text-decoration-color:#e9e4db}

.foot{background:var(--ink);border-top:1px solid rgba(233,228,219,.14);color:#b8b1a5;font-size:13.5px}
.foot-row{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;padding:24px 0 40px}
.foot strong{letter-spacing:.16em;color:#e9e4db}

/* Product narrative: present work, planned product, and a labelled concept. */
.btn{gap:12px}
.product-hero{padding:96px 0 72px;text-align:center}
.product-hero h1{font-size:66px;line-height:1.19}
.hero-description{max-width:48em;margin:28px auto;color:var(--sub);font-size:18px;line-height:1.85}
.product-hero .actions{justify-content:center}
.hero-status{margin-top:22px;color:var(--muted);font-size:13px}
.hero-status span{margin:0 12px;color:var(--line-strong)}
.project-proof{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));max-width:880px;margin:44px auto 0;border-top:1px solid var(--line-strong);border-bottom:1px solid var(--line-strong);text-align:left}
.project-proof>div{padding:20px 24px}.project-proof>div+div{border-left:1px solid var(--line-strong)}
.project-proof dt{font-size:12px;color:var(--muted);margin-bottom:6px}.project-proof dd{font-size:16px;font-weight:600;color:var(--name)}
.claude-project{margin-top:32px;padding:24px;border:1px solid var(--line-strong);background:var(--paper)}
.claude-project .label{margin-bottom:10px;font-size:11px}.claude-project h3{font-size:18px;line-height:1.5}.claude-project>p:last-child{margin-top:12px;font-size:14px;color:var(--sub)}
.usage-flow{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:32px;margin-top:44px}
.usage-flow li{border-top:2px solid var(--ink);padding-top:22px}.usage-role{font-size:12px;color:var(--accent);font-weight:600}.usage-flow h3{font-size:22px;letter-spacing:-.03em;margin:14px 0 12px}.usage-flow p{font-size:15px;color:var(--sub)}
.product-section{padding-top:72px;border-top:1px solid var(--line)}
.product-heading{display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:end}
.stage{display:inline-block;border:1px solid var(--line-strong);padding:3px 10px;margin-bottom:14px;color:var(--sub);font-size:12.5px}
.product-intro{max-width:36em;color:var(--sub);font-size:16px;line-height:1.85}
.reply-concept{margin-top:44px;border:1px solid var(--line-strong);border-radius:12px;overflow:hidden;background:#fff;box-shadow:0 20px 54px -38px rgba(31,30,27,.4)}
.concept-bar{display:flex;justify-content:space-between;gap:20px;padding:16px 24px;background:var(--band);border-bottom:1px solid var(--line);font-size:13px;color:var(--sub)}
.concept-bar strong{color:var(--ink);letter-spacing:.06em}.concept-bar strong span{font-weight:400;letter-spacing:0;margin-left:8px}
.reply-flow{display:grid;grid-template-columns:1fr 1.2fr 1fr}
.reply-step{padding:30px 28px 28px;min-width:0}.reply-step+.reply-step{border-left:1px solid var(--line)}
.step-label{font-size:12px;color:var(--muted);letter-spacing:.05em;margin-bottom:24px}.step-label span{color:var(--ink);font-weight:600;margin-left:10px}
.review-stars{color:var(--accent);font-size:16px;letter-spacing:.12em;margin-bottom:16px}.review-stars span{color:var(--line-strong)}
.review-body{font-size:16px;line-height:1.95}.example-tag{font-size:11.5px;color:var(--muted);margin-top:20px}
.draft .review-body{padding:16px 18px;border-left:2px solid var(--accent);background:#faf7f1}
.approval h3{font-size:23px;line-height:1.4;letter-spacing:-.025em}
.review-checks{margin-top:18px;font-size:13px;color:var(--sub)}.review-checks li{padding:5px 0;border-bottom:1px solid var(--line)}
.approval-note{font-size:12px;color:var(--sub);margin-top:18px}
.reply-concept figcaption{margin:0;padding:14px 24px;border-top:1px solid var(--line);background:var(--paper);font-size:12.5px}
.product-details{display:grid;grid-template-columns:repeat(3,1fr);gap:40px;margin-top:36px}.product-details h3{font-size:16px;margin-bottom:8px}.product-details p{font-size:14.5px;color:var(--sub)}
.product-cta{margin-top:32px;font-size:14px}.product-cta a{border-bottom:1px solid var(--ink);padding-bottom:4px}
.work-preview{margin-top:40px}.work-preview img{width:100%;border:1px solid var(--line-strong);border-radius:10px}.work-preview figcaption{max-width:66em}
.roadmap{display:grid;grid-template-columns:repeat(3,1fr);gap:40px;margin-top:48px}.roadmap li{border-top:1px solid var(--ink);padding-top:24px}.roadmap h3{font-size:22px;letter-spacing:-.03em;margin:14px 0 12px}.roadmap p{font-size:15px;color:var(--sub)}.roadmap-state{font-size:12px;color:var(--muted)}.roadmap-state.current{color:var(--accent);font-weight:600}
.about-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:72px}.founder{margin-top:24px;font-size:13px;color:var(--sub)}.about-copy>p{font-size:16px;color:var(--sub);margin-bottom:18px}.english-summary{border-top:1px solid var(--line-strong);padding-top:22px;margin-top:28px}.english-summary h3{font-size:13px;margin-bottom:8px}.english-summary p{font-size:13.5px;line-height:1.8;color:var(--sub);letter-spacing:0;word-break:normal}
.faq-grid{display:grid;grid-template-columns:1fr 1.5fr;gap:72px}.faq-list{border-top:1px solid var(--ink)}.faq-list details{border-bottom:1px solid var(--line-strong);padding:22px 0}.faq-list summary{font-size:16px;font-weight:600;cursor:pointer;list-style:none;padding-right:28px;position:relative}.faq-list summary::-webkit-details-marker{display:none}.faq-list summary::after{content:'+';position:absolute;right:0;font-size:20px;font-weight:400;top:-3px}.faq-list details[open] summary::after{content:'−'}.faq-list details p{margin-top:14px;color:var(--sub);font-size:15px;line-height:1.85}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.btn{transition:none}}

@media (max-width:1100px){
  .phone{right:-8px;width:180px}
  .hero h1{font-size:54px}
}
@media (max-width:900px){
  .product-hero h1{font-size:48px}
  .product-heading,.about-grid,.faq-grid{grid-template-columns:1fr;gap:28px}
  .reply-flow{grid-template-columns:1fr}
  .reply-step+.reply-step{border-left:0;border-top:1px solid var(--line)}
  .reply-step{padding:24px}.step-label{margin-bottom:16px}
  .product-details,.roadmap{gap:24px}
  /* The bar scrolls away with the page; the section links sit in a row under it that scrolls sideways. */
  html{scroll-padding-top:12px}
  .top{position:static}
  .top-row{height:auto;flex-wrap:wrap;justify-content:space-between;gap:0 16px;padding-top:14px}
  .top-nav{order:3;width:calc(100% + 48px);margin:12px -24px 0;padding:0 24px 12px;gap:24px;overflow-x:auto;scrollbar-width:none;white-space:nowrap}
  .top-nav::-webkit-scrollbar{display:none}
  .hero{padding:64px 0 44px}
  .hero h1{font-size:44px}
  .hero-row{flex-direction:column;align-items:flex-start;gap:28px}
  .showcase{padding-bottom:64px}
  .phone{width:150px;bottom:-40px;border-width:5px;border-radius:24px}
  .phone img{border-radius:19px}
  .section{padding:84px 0}
  .head h2{font-size:32px}
  .case,.split,.cost,.contact-row{grid-template-columns:minmax(0,1fr);gap:40px}
  .steps{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 20px}
  .contact{padding:80px 0}
  .contact h2{font-size:30px}
}
@media (max-width:600px){
  .product-hero h1{font-size:35px}
  .hero-description{font-size:16px;margin:22px auto}.hero-description br{display:none}
  .product-hero .actions{flex-direction:column;max-width:330px;margin:0 auto}
  .hero-status{font-size:11.5px}.hero-status span{margin:0 4px}
  .product-section{padding-top:44px}
  .concept-bar{padding:14px 18px;font-size:11px;gap:10px}.concept-bar strong span{display:block;margin:2px 0 0}
  .reply-step{padding:22px 20px}.reply-concept figcaption{padding:14px 20px}
  .product-details,.roadmap{grid-template-columns:1fr;gap:24px}
  .project-proof{grid-template-columns:1fr;margin-top:30px}.project-proof>div{display:flex;justify-content:space-between;gap:16px;padding:15px 4px;align-items:center}.project-proof>div+div{border-left:0;border-top:1px solid var(--line)}.project-proof dt{margin-bottom:0;flex-shrink:0}.project-proof dd{font-size:14px;text-align:right}
  .usage-flow{grid-template-columns:1fr;gap:28px;margin-top:32px}.usage-flow h3{font-size:21px}.claude-project{padding:20px}
  .product-details>div{border-bottom:1px solid var(--line);padding-bottom:20px}
  .work-preview picture{max-width:280px;margin:0 auto}.work-preview img{border:6px solid var(--ink);border-radius:32px}
  body{font-size:15.5px}
  .wrap{width:calc(100% - 36px)}
  .top-nav{width:calc(100% + 36px);margin-left:-18px;margin-right:-18px;padding-left:18px;padding-right:18px}
  .logo{font-size:16px}
  .top-demo{padding:7px 12px;font-size:13.5px}
  .hero{padding:40px 0 32px}
  .hero h1{font-size:34px}
  .lead{font-size:16px}
  .btn{min-height:48px;padding:0 20px}
  /* Phones see phone screens (the <picture> sources in index.html), in a phone's frame. */
  .browser,.case-shots img{border:6px solid var(--ink);background:var(--ink)}
  .browser{width:min(270px,78%);margin:0 auto;border-radius:34px;box-shadow:0 24px 50px -20px rgba(31,30,27,.45)}
  .browser img{border-radius:28px}
  .browser-bar,.phone{display:none}
  .showcase{background:linear-gradient(var(--paper) 0 24%,var(--table) 24% 100%);padding-bottom:56px}
  .case-shots{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
  .case-shots img{border-width:5px;border-radius:24px}
  .case-shots figcaption{text-align:center}
  .section{padding:68px 0}
  .head h2{font-size:27px}
  .case-lead{font-size:17px}
  .facts div{grid-template-columns:56px minmax(0,1fr);gap:12px}
  .index li{grid-template-columns:minmax(0,1fr);gap:6px;padding:20px 0}
  .figure{font-size:44px}
  .steps{grid-template-columns:minmax(0,1fr)}
  .contact{padding:68px 0}
  .contact h2{font-size:25px}
  .contact .mail a,.contact .mail .address{font-size:21px}
}