/* 이음 · Ieum. BRAND.md 팔레트: Midnight, Mint, Forest, Paper. 하나로 이어지는 리본 선. */
:root{
  --midnight:#101E30;--midnight-2:#1A2C43;--mint:#64D9C0;--mint-soft:#D8F4EC;--forest:#204C3E;--paper:#F8FAF9;--paper-2:#EDF3F0;
  --ivory:#FFF8EC;--text:#14241F;--muted:#4A5D57;--line:#CFDCD6;--on-dark:#E8F1EE;--on-dark-2:#AFC2C4;
  --sans:"Apple SD Gothic Neo","Noto Sans KR","Malgun Gothic",system-ui,-apple-system,"Segoe UI",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--text);font:400 17px/1.8 var(--sans);word-break:keep-all;overflow-wrap:anywhere}
img,svg{max-width:100%;height:auto}
a{color:var(--forest);text-underline-offset:3px}
h1,h2,h3{margin:0;line-height:1.25;letter-spacing:-.025em;font-weight:700}
h1{font-size:clamp(2.5rem,7.2vw,4.6rem)}
h2{font-size:clamp(1.75rem,4.4vw,2.8rem)}
h3{font-size:1.16rem}
p{margin:0 0 1em}
ul,ol{margin:0;padding:0}
main:focus{outline:none}
:focus-visible{outline:3px solid #0E8F76;outline-offset:3px;border-radius:4px}
.hero :focus-visible,.dark :focus-visible,.site-header :focus-visible,.site-footer :focus-visible{outline-color:var(--mint)}
.wrap{width:min(1120px,100%);margin-inline:auto;padding-inline:clamp(18px,4vw,32px)}
.narrow{width:min(760px,100%)}
.skip{position:absolute;left:12px;top:-60px;z-index:50;background:var(--mint);color:var(--midnight);padding:10px 16px;border-radius:8px}
.skip:focus{top:12px}
.small{font-size:.92rem;color:var(--muted)}
.eyebrow{font-size:.9rem;font-weight:700;color:var(--forest);margin-bottom:10px}
.intro{margin-top:16px;color:var(--muted);max-width:640px}

.site-header{position:sticky;top:0;z-index:20;background:var(--midnight);color:var(--on-dark);border-bottom:1px solid rgba(100,217,192,.25)}
.site-header .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:6px 22px;padding-block:10px}
.site-header a{color:inherit}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;font-weight:700;font-size:1.14rem}
.brand img{border-radius:9px;display:block}
.brand small{margin-left:6px;font-size:.78rem;font-weight:500;color:var(--on-dark-2)}
.site-nav{display:flex;flex-wrap:wrap;gap:2px 16px;margin-left:auto;font-size:.95rem}
.site-nav a{text-decoration:none;padding:6px 2px}
.site-nav a:hover{color:var(--mint)}
.pill{border:1px solid var(--mint);color:var(--mint);border-radius:999px;padding:1px 12px;font-size:.84rem;font-weight:600;white-space:nowrap}

.hero{background:var(--midnight);color:var(--on-dark)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:clamp(32px,6vw,72px);align-items:center;padding-block:clamp(56px,9vw,112px)}
.hero h1{color:#fff}
.hero .eyebrow{color:var(--mint)}
.lead{font-size:clamp(1.05rem,2vw,1.22rem);margin-top:20px;max-width:540px;color:var(--on-dark)}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0}
.button{display:inline-block;background:var(--mint);color:var(--midnight);border:1px solid var(--mint);border-radius:999px;padding:11px 22px;font-weight:700;text-decoration:none;transition:background-color .15s ease,color .15s ease}
.button:hover{background:#86E6D1}
.button.ghost{background:transparent;color:var(--on-dark);border-color:var(--on-dark-2)}
.button.ghost:hover{border-color:var(--mint);color:var(--mint)}
.notice{border-left:3px solid var(--mint);padding:2px 0 2px 14px;font-size:.96rem;max-width:540px}

.thread-box{position:relative;min-width:0;max-width:420px;justify-self:end;width:100%}
.thread-line{position:absolute;left:0;top:0;width:56px;height:100%;overflow:visible;animation:draw 1.4s ease-out both}
.thread-line path{fill:none;stroke:var(--mint);stroke-width:7;stroke-linecap:round;vector-effect:non-scaling-stroke}
@keyframes draw{from{clip-path:inset(-10px -10px 100% -10px)}to{clip-path:inset(-10px)}}
.thread{position:relative;list-style:none;display:grid;grid-auto-rows:1fr;gap:14px;padding-left:64px}
.thread li{position:relative;display:flex;flex-direction:column;justify-content:center;background:var(--midnight-2);border:1px solid rgba(100,217,192,.4);border-radius:14px;padding:10px 18px;line-height:1.45;min-width:0}
.thread li::before{content:"";position:absolute;top:50%;left:-59px;width:18px;height:18px;margin-top:-9px;border-radius:50%;background:var(--ivory);border:3px solid var(--midnight)}
.thread li:nth-child(even)::before{left:-31px}
.thread b{display:block;color:#fff}
.thread span{font-size:.9rem;color:var(--on-dark-2)}

.section{padding-block:clamp(60px,9vw,104px)}
.tint{background:var(--paper-2)}
.dark{background:var(--midnight);color:var(--on-dark)}
.dark h2{color:#fff}
.dark .eyebrow{color:var(--mint)}

.rows{margin-top:36px}
.rows article{display:grid;grid-template-columns:220px minmax(0,1fr);gap:4px 28px;border-top:1px solid var(--line);padding:20px 0}
.rows article:last-child{border-bottom:1px solid var(--line)}
.rows h3{color:var(--forest);font-size:1.3rem}
.rows p{margin:0}

.shot{margin:28px 0 0}
.shot img{display:block;width:100%;border-radius:12px;border:1px solid rgba(100,217,192,.35)}
.shot figcaption{margin-top:12px;font-size:.92rem;color:var(--on-dark-2)}

.demo{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:clamp(24px,5vw,56px);align-items:center}
.demo h2{margin-bottom:16px}
.demo-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;min-width:0}
.demo-card fieldset{border:0;padding:0;margin:0 0 14px;display:flex;flex-wrap:wrap;gap:8px}
.demo-card legend{font-weight:700;padding:0;margin-bottom:6px}
.demo-card fieldset label{cursor:pointer}
.demo-card fieldset input{position:absolute;opacity:0;width:1px;height:1px}
.demo-card fieldset span{display:inline-block;border:1px solid var(--forest);border-radius:999px;padding:4px 14px;font-size:.92rem}
.demo-card fieldset input:checked+span{background:var(--forest);color:#fff}
.demo-card fieldset input:focus-visible+span{outline:3px solid #0E8F76;outline-offset:2px}
.select-label{display:block;font-weight:700;margin-bottom:4px}
select{width:100%;font:inherit;padding:8px 10px;border:1px solid var(--forest);border-radius:10px;background:#fff;color:var(--text);margin-bottom:14px}
.send-out{display:block;min-height:6.6em;background:var(--mint-soft);border-radius:10px;padding:12px 14px;font-size:.96rem;line-height:1.6}
.send-out b{display:block}
.demo-static{margin:0}
.demo-static div+div{margin-top:10px}
.demo-static dt{font-weight:700}
.demo-static dd{margin:0;color:var(--muted)}

.platform-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:32px}
.platform-grid article{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;min-width:0}
.ph{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:2px 12px;margin-bottom:8px}
.ph span{font-size:.88rem;font-weight:600;color:var(--forest)}
.platform-grid p{margin:0;font-size:.98rem;color:var(--muted)}
.platform-grid strong{color:var(--text)}

.need-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:28px;margin-top:32px}
.need-grid article{border-top:3px solid var(--mint);padding-top:14px;min-width:0}
.need-grid p{margin:8px 0 0;color:var(--muted);font-size:.98rem}

.limits{list-style:none;margin-top:32px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 40px}
.limits li{border-top:1px solid var(--line);padding:14px 0;font-size:.98rem;color:var(--muted)}
.limits strong{display:block;color:var(--text)}

.credit{list-style:none;margin-top:20px}
.credit li{border-top:1px solid var(--line);padding:10px 0}

details{border-top:1px solid var(--line);padding:4px 0}
details:last-of-type{border-bottom:1px solid var(--line)}
#faq h2{margin-bottom:24px}
summary{cursor:pointer;font-weight:700;padding:10px 0}
details p{color:var(--muted)}

.closing{background:var(--forest);color:#fff;padding-block:clamp(52px,8vw,88px);text-align:center}
.closing .cta-row{justify-content:center;margin-bottom:12px}
.closing .small{color:#CFE5DD;margin:0}
.closing .button.ghost{color:#fff;border-color:#CFE5DD}

.doc{padding-block:clamp(40px,6vw,72px)}
.doc h1{font-size:clamp(1.9rem,5vw,3rem);margin-bottom:18px}
.doc h2{font-size:1.4rem;margin:40px 0 10px;scroll-margin-top:84px}
.doc ul,.doc ol{padding-left:1.3em;margin-bottom:1em}
.doc li{margin:4px 0}
.doc .notice{max-width:none;background:var(--mint-soft);border-left-color:var(--forest);padding:12px 16px;border-radius:0 10px 10px 0}
.doc .button{background:var(--forest);border-color:var(--forest);color:#fff}
.doc .button.ghost{background:transparent;color:var(--forest);border-color:var(--forest)}
code,kbd{font:500 .9em ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;background:var(--paper-2);border:1px solid var(--line);border-radius:5px;padding:0 5px}
.meta{font-size:.92rem;color:var(--muted)}
.toc{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:.94rem;margin-top:12px}
.qa{margin:0}
.qa div{border-top:1px solid var(--line);padding:12px 0}
.qa dt{font-weight:700}
.qa dd{margin:2px 0 0;color:var(--muted)}
.notfound{text-align:center;min-height:50vh}
.notfound .cta-row{justify-content:center}

.site-footer{background:var(--midnight);color:var(--on-dark);padding-block:44px 28px;font-size:.95rem}
.site-footer a{color:inherit}
.foot-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.site-footer h2{font-size:1rem;letter-spacing:0;margin-bottom:8px;color:var(--mint)}
.site-footer ul{list-style:none}
.site-footer li{padding:2px 0}
.copy{margin:28px 0 0;font-size:.86rem;color:var(--on-dark-2)}

.reveal{opacity:0;transform:translateY(12px);transition:opacity .5s ease,transform .5s ease}
.reveal.in{opacity:1;transform:none}

@media (max-width:900px){
  .hero-grid,.demo{grid-template-columns:minmax(0,1fr)}
  .thread-box{justify-self:start}
  .need-grid{grid-template-columns:minmax(0,1fr);gap:20px}
}
@media (max-width:640px){
  body{font-size:16px}
  .site-nav{order:3;width:100%;margin-left:0;gap:0 14px;font-size:.92rem}
  .pill{margin-left:auto}
  .rows article,.platform-grid,.limits,.foot-grid{grid-template-columns:minmax(0,1fr)}
  .button{width:100%;text-align:center}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
}