:root{
  --bg:#f6f9fb; --surface:#ffffff; --ink:#16232e; --muted:#54677a;
  --primary:#0e7fd6; --primary-dark:#0a63ab; --teal:#0bb4a6; --line:#dde8f0;
  --soft:#eef6fc; --good:#0a7d43; --bad:#b3261e; --radius:16px;
  --shadow:0 10px 30px rgba(14,127,214,.10);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}
a{color:var(--primary-dark)}
img{max-width:100%}
.site-header{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 20px}
.logo{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;font-size:1.3rem}
.logo svg{width:34px;height:34px}
.logo em{font-style:normal;color:var(--primary)}
.main-nav{display:flex;gap:22px}
.main-nav a{color:var(--ink);text-decoration:none;font-weight:600;font-size:.98rem}
.main-nav a:hover{color:var(--primary)}
.nav-toggle{display:none;background:none;border:0;font-size:1.5rem;cursor:pointer;color:var(--ink)}
.hero{background:linear-gradient(160deg,#fff 0%,var(--soft) 100%);border-bottom:1px solid var(--line);padding:52px 0 38px;text-align:center}
.hero h1{font-size:2.35rem;line-height:1.15;margin:0 0 12px}
.hero h1 .grad{background:linear-gradient(45deg,var(--primary),var(--teal));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lede{color:var(--muted);font-size:1.1rem;max-width:660px;margin:0 auto 26px}
.tool-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:26px;max-width:760px;margin:0 auto;text-align:left}
.dropzone{border:2px dashed #a8cfe8;border-radius:12px;padding:32px 20px;text-align:center;background:#f4fbff;cursor:pointer;transition:border-color .15s,background .15s}
.dropzone:hover,.dropzone.drag{border-color:var(--primary);background:var(--soft)}
.dropzone .dz-icon{font-size:2.1rem}
.dropzone p{margin:6px 0}
.dz-main{font-weight:700;font-size:1.05rem}
.dz-sub{color:var(--muted);font-size:.9rem}
.privacy-note{margin-top:14px;font-size:.88rem;color:var(--muted);text-align:center}
.file-info{display:flex;gap:16px;align-items:center;margin-top:18px;background:var(--soft);border:1px solid var(--line);border-radius:12px;padding:12px 14px}
.file-info img{width:74px;height:74px;object-fit:cover;border-radius:9px;border:1px solid var(--line);background:#fff}
.file-info .fi-name{font-weight:700;word-break:break-all}
.file-info .fi-meta{color:var(--muted);font-size:.88rem}
.link-btn{background:none;border:0;color:var(--primary-dark);font-weight:700;cursor:pointer;padding:0;font-size:.9rem}
.tabs{display:flex;gap:8px;margin-top:20px;flex-wrap:wrap}
.tab{border:1px solid var(--line);background:#fff;border-radius:999px;padding:9px 18px;font-weight:600;cursor:pointer;font-size:.94rem}
.tab.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.panel{margin-top:16px;border:1px solid var(--line);border-radius:12px;padding:18px;background:#fff}
.panel h3{margin:0 0 10px;font-size:1.02rem}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:flex-end}
.field{display:flex;flex-direction:column;gap:5px}
.field label{font-size:.85rem;font-weight:600;color:var(--muted)}
.field input[type=number],.field select{padding:10px 12px;border:1px solid var(--line);border-radius:10px;font-size:.97rem;background:#fff;color:var(--ink)}
.field input[type=number]{width:128px}
.checkline{display:flex;align-items:center;gap:8px;font-size:.93rem;font-weight:600}
.presets{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.chip{border:1px solid var(--line);background:var(--soft);border-radius:999px;padding:7px 14px;font-weight:600;cursor:pointer;font-size:.88rem}
.chip.active{background:var(--teal);color:#fff;border-color:var(--teal)}
input[type=range]{width:100%;accent-color:var(--primary)}
.qline{display:flex;justify-content:space-between;font-size:.9rem;color:var(--muted);font-weight:600}
.fmt-buttons{display:flex;gap:8px;flex-wrap:wrap}
.fmt-btn{border:1px solid var(--line);background:#fff;border-radius:10px;padding:11px 20px;font-weight:700;cursor:pointer;font-size:.95rem}
.fmt-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.outline{margin-top:14px;background:var(--soft);border:1px solid var(--line);border-radius:10px;padding:12px 14px;font-size:.94rem}
.outline b{color:var(--primary-dark)}
.save-pos{color:var(--good);font-weight:700}
.save-neg{color:var(--bad);font-weight:700}
.btn{display:inline-block;background:var(--primary);color:#fff;border:0;border-radius:12px;padding:13px 26px;font-size:1rem;font-weight:700;cursor:pointer;text-decoration:none;margin-top:14px}
.btn:hover{background:var(--primary-dark)}
.btn:disabled{background:#b9cdd9;cursor:not-allowed}
.status{margin-top:14px;font-size:.94rem}
.status.error{color:var(--bad);background:#fdecea;border:1px solid #f5c6c2;border-radius:10px;padding:12px 14px}
.preview-wrap{margin-top:14px;text-align:center}
.preview-wrap img{max-height:300px;border:1px solid var(--line);border-radius:10px;background:#fff}
.hidden{display:none !important}
section.block{padding:44px 0}
section.block h2{font-size:1.6rem;margin:0 0 10px}
section.block .sub{color:var(--muted);max-width:720px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:20px}
.grid.two{grid-template-columns:repeat(2,1fr)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px}
.card h3{margin:0 0 6px;font-size:1.05rem}
.card p{margin:0;color:var(--muted);font-size:.95rem}
.step-num{display:inline-flex;width:30px;height:30px;border-radius:50%;background:var(--primary);color:#fff;align-items:center;justify-content:center;font-weight:800;margin-bottom:8px}
details.faq{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin-top:10px}
details.faq summary{font-weight:700;cursor:pointer}
details.faq p{color:var(--muted);margin:8px 0 2px}
article.page{padding:40px 0 56px;max-width:840px}
article.page h1{font-size:2rem;line-height:1.25}
article.page h2{margin-top:30px;font-size:1.3rem}
article.page p,article.page li{color:#2b3d4d}
article.page ol,article.page ul{padding-left:22px}
table.sizes{border-collapse:collapse;width:100%;margin-top:14px;background:#fff}
table.sizes th,table.sizes td{border:1px solid var(--line);padding:9px 12px;text-align:left;font-size:.94rem}
table.sizes th{background:var(--soft)}
.site-footer{background:#12222f;color:#c3d2dd;margin-top:20px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:24px;padding:38px 20px 10px}
.footer-grid a{color:#c3d2dd;text-decoration:none;display:block;padding:3px 0;font-size:.94rem}
.footer-grid a:hover{color:#fff}
.footer-brand{color:#fff;font-weight:800;font-size:1.15rem;margin:0 0 6px}
.footer-h{color:#fff;font-weight:700;margin:0 0 8px}
.footer-bottom{border-top:1px solid #22384a;padding:14px 20px 22px;font-size:.85rem;color:#8ea6b5}
@media (max-width:820px){
  .grid,.grid.two,.footer-grid{grid-template-columns:1fr}
  .hero h1{font-size:1.8rem}
  .main-nav{display:none;position:absolute;top:60px;right:16px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);flex-direction:column;padding:14px 18px;gap:12px}
  .main-nav.open{display:flex}
  .nav-toggle{display:block}
}