:root{
  --bg:#f5f7fb;
  --card:#fff;
  --text:#172033;
  --muted:#667085;
  --line:#e4e8f0;
  --brand:#5b5bd6;
  --brand2:#7c3aed;
  --soft:#eef0ff;
  --green:#15803d;
  --danger:#b42318;
  --shadow:0 18px 50px rgba(25,33,61,.09);
  --radius:22px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans KR",sans-serif;
  line-height:1.7
}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
img,canvas{max-width:100%;display:block}
.container{width:min(1160px,calc(100% - 32px));margin:auto}
.site-header{
  position:sticky;top:0;z-index:40;background:rgba(245,247,251,.92);
  backdrop-filter:blur(16px);border-bottom:1px solid rgba(228,232,240,.9)
}
.header-inner{height:72px;display:flex;align-items:center;justify-content:space-between;gap:22px}
.logo{font-size:1.35rem;font-weight:950;letter-spacing:-.04em}
.logo b{color:var(--brand)}
.nav{display:flex;align-items:center;gap:22px;font-weight:800;font-size:.94rem}
.nav a:hover{color:var(--brand)}
.menu-btn{display:none;border:0;background:var(--soft);border-radius:12px;padding:10px 12px;cursor:pointer}
.hero{padding:78px 0 46px}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:34px;align-items:center}
.kicker,.badge{
  display:inline-flex;align-items:center;gap:7px;background:var(--soft);color:#4242a8;
  border-radius:999px;padding:7px 11px;font-size:.8rem;font-weight:900
}
h1,h2,h3{line-height:1.25;letter-spacing:-.035em}
h1{font-size:clamp(2.5rem,6vw,4.65rem);margin:18px 0}
.hero p{font-size:1.12rem;color:var(--muted);max-width:680px}
.hero-panel{
  min-height:360px;padding:30px;border-radius:32px;
  background:linear-gradient(145deg,#e8e8ff,#f8edff 52%,#fff5ea);
  box-shadow:var(--shadow);display:grid;gap:16px;align-content:center
}
.mini-tool{
  display:flex;align-items:center;gap:14px;background:rgba(255,255,255,.83);
  border:1px solid rgba(255,255,255,.75);padding:16px;border-radius:18px
}
.mini-tool .icon{font-size:1.8rem}
.button{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border:0;border-radius:14px;padding:13px 18px;background:var(--brand);
  color:#fff;font-weight:900;cursor:pointer
}
.button:hover{background:#4747bd}
.button.secondary{background:#fff;color:var(--text);border:1px solid var(--line)}
.button.danger{background:#fff1f0;color:var(--danger);border:1px solid #ffd3cf}
.section{padding:46px 0}
.section-title{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:22px}
.section-title h2{margin:0;font-size:2rem}
.section-title p{margin:3px 0 0;color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:23px;box-shadow:0 5px 18px rgba(31,39,73,.035);transition:.2s ease
}
a.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#cacff7}
.card .icon{font-size:2rem}
.card h3{margin:12px 0 7px}
.card p{margin:0;color:var(--muted)}
.card-foot{margin-top:16px;color:var(--brand);font-weight:900;font-size:.9rem}
.category-bar{display:flex;gap:9px;flex-wrap:wrap;margin-bottom:20px}
.category-bar a{background:#fff;border:1px solid var(--line);padding:8px 12px;border-radius:999px;font-size:.86rem;font-weight:800}
.tool-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:30px;align-items:start}
.tool-box{
  background:#fff;border:1px solid var(--line);border-radius:26px;padding:clamp(22px,4vw,38px);
  box-shadow:var(--shadow)
}
.tool-box h1{font-size:clamp(2rem,5vw,3.25rem);margin:10px 0 12px}
.tool-intro{color:var(--muted);font-size:1.06rem}
.controls{display:grid;gap:17px;margin-top:28px}
.control-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
label{font-weight:900;font-size:.92rem}
input[type="text"],input[type="number"],input[type="url"],input[type="email"],select,textarea{
  width:100%;border:1px solid var(--line);background:#fff;border-radius:13px;
  padding:13px 14px;color:var(--text)
}
input[type="file"]{width:100%;border:1px dashed #bfc5d7;background:#fafbff;border-radius:14px;padding:16px}
input[type="range"]{width:100%}
textarea{min-height:170px;resize:vertical}
.help{font-size:.85rem;color:var(--muted);margin-top:5px}
.preview{
  margin-top:22px;min-height:180px;border:1px dashed #cfd5e2;border-radius:18px;
  background:#fafbfe;padding:18px;display:grid;place-items:center;overflow:auto
}
.preview img{max-height:440px;border-radius:12px}
.preview canvas{max-height:500px}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:18px}
.stat{background:#f8f9fd;border:1px solid var(--line);border-radius:15px;padding:15px;text-align:center}
.stat strong{display:block;font-size:1.55rem}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}
.message{display:none;margin-top:15px;padding:12px 14px;border-radius:12px;background:#ecfdf3;color:#166534;font-weight:800}
.message.error{background:#fff1f0;color:var(--danger)}
.sidebar{position:sticky;top:94px}
.sidebar .card{margin-bottom:16px}
.sidebar ul{margin:8px 0 0;padding-left:19px}
.article{
  background:#fff;border:1px solid var(--line);border-radius:26px;padding:clamp(24px,5vw,52px);
  box-shadow:var(--shadow)
}
.article h1{font-size:clamp(2.2rem,5vw,3.5rem)}
.article h2{font-size:1.55rem;margin-top:40px}
.article .lead{font-size:1.12rem;color:var(--muted);border-left:4px solid var(--brand);padding-left:15px}
.info,.faq,.toc{background:#f4f5ff;border-radius:18px;padding:20px 22px;margin:24px 0}
.faq details{border-bottom:1px solid #dfe1fb;padding:13px 0}
.faq details:last-child{border-bottom:0}
.faq summary{font-weight:900;cursor:pointer}
.page-hero{text-align:center;padding:58px 0 28px}
.page-hero h1{font-size:clamp(2.3rem,5vw,3.7rem);margin-bottom:10px}
.page-hero p{max-width:730px;margin:auto;color:var(--muted)}
.breadcrumb{font-size:.88rem;color:var(--muted);padding-top:24px}
.draw-wrap{background:#fff;border:1px solid var(--line);border-radius:16px;padding:10px}
#signatureCanvas{width:100%;height:260px;touch-action:none;background-image:linear-gradient(#f6f7fb 1px,transparent 1px),linear-gradient(90deg,#f6f7fb 1px,transparent 1px);background-size:20px 20px}
.crop-stage{position:relative;display:inline-block;max-width:100%}
.crop-stage img{max-height:480px;user-select:none}
.crop-selection{position:absolute;border:2px solid #fff;box-shadow:0 0 0 9999px rgba(0,0,0,.42);cursor:move}
.crop-handle{position:absolute;width:14px;height:14px;background:#fff;border:2px solid var(--brand);border-radius:50%}
.crop-handle.br{right:-8px;bottom:-8px;cursor:nwse-resize}
#qrOutput canvas,#qrOutput img{margin:auto}
footer{margin-top:70px;background:#141a2b;color:#e8ebf5;padding:46px 0 24px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:26px}
footer h3{margin-top:0}
footer p,footer a{color:#b9c0d3}
footer a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:28px;padding-top:18px;font-size:.86rem;color:#9ba5bc}
.notice{font-size:.85rem;color:var(--muted)}
@media(max-width:920px){
  .hero-grid,.tool-layout,.footer-grid{grid-template-columns:1fr}
  .grid{grid-template-columns:repeat(2,1fr)}
  .sidebar{position:static}
}
@media(max-width:720px){
  .menu-btn{display:block}
  .nav{display:none;position:absolute;left:16px;right:16px;top:72px;background:#fff;border:1px solid var(--line);border-radius:16px;padding:16px;flex-direction:column;align-items:stretch;box-shadow:var(--shadow)}
  .nav.open{display:flex}
  .grid,.control-row,.stat-grid{grid-template-columns:1fr}
  .hero{padding-top:48px}
}