:root{
  --bg:#F6F5F1;
  --surface:#FFFFFF;
  --border:#E4E2DA;
  --text:#191816;
  --text-dim:#6B6860;
  --accent:#2F5FE0;
  --accent-dark:#1F3F9E;
  --accent-light:#EAF0FF;
  --good:#1F7A4D;
  --good-bg:#E7F5EC;
  --warn:#B3690E;
  --warn-bg:#FBF0DE;
  --bad:#B23A3A;
  --bad-bg:#FBEAEA;
  --radius:10px;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:'Inter',-apple-system,'Segoe UI',Roboto,sans-serif;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3{
  font-family:'Space Grotesk','Inter',sans-serif;
  font-weight:600;
  line-height:1.25;
  margin:0 0 .5em;
}
h1{font-size:clamp(28px,4vw,42px);}
h2{font-size:24px;}
h3{font-size:18px;}
p{margin:0 0 1em;color:var(--text);}
a{color:var(--accent);text-decoration:none;}
a:hover{text-decoration:underline;}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px;}
.narrow{max-width:760px;margin:0 auto;padding:0 20px;}

/* header */
header.site{border-bottom:1px solid var(--border);background:var(--surface);}
.nav{display:flex;align-items:center;justify-content:space-between;padding:16px 0;}
.logo{display:flex;align-items:center;gap:10px;font-family:'Space Grotesk',sans-serif;font-weight:600;font-size:17px;color:var(--text);}
.logo img{width:30px;height:30px;border-radius:7px;}
.navlinks{display:flex;gap:22px;font-size:14px;}
.navlinks a{color:var(--text-dim);font-weight:500;}
.navlinks a:hover{color:var(--accent);text-decoration:none;}

/* hero */
.hero{padding:56px 0 40px;}
.hero .kicker{color:var(--accent);font-weight:600;font-size:13px;letter-spacing:.02em;margin-bottom:10px;}
.hero p.lead{font-size:17px;color:var(--text-dim);max-width:600px;}

/* checker card */
.checker{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:22px;margin-top:28px;box-shadow:0 1px 2px rgba(20,20,15,.04);}
.checker form{display:flex;gap:10px;flex-wrap:wrap;}
.checker input[type=url]{flex:1;min-width:220px;padding:12px 14px;border:1px solid var(--border);border-radius:8px;font-size:15px;font-family:inherit;}
.checker input[type=url]:focus{outline:2px solid var(--accent-light);border-color:var(--accent);}
.btn{background:var(--accent);color:#fff;border:none;padding:12px 22px;border-radius:8px;font-size:14.5px;font-weight:600;cursor:pointer;font-family:inherit;}
.btn:hover{background:var(--accent-dark);}
.btn.secondary{background:var(--surface);color:var(--text);border:1px solid var(--border);}
.btn.secondary:hover{border-color:var(--accent);background:var(--accent-light);}
.btn:disabled{opacity:.6;cursor:not-allowed;}

#results{margin-top:20px;}
.score-row{display:flex;gap:16px;align-items:stretch;flex-wrap:wrap;margin-bottom:16px;}
.score-box{background:var(--accent-light);border-radius:10px;padding:16px 22px;text-align:center;min-width:120px;}
.score-box .num{font-size:32px;font-weight:700;font-family:'Space Grotesk',sans-serif;color:var(--accent-dark);}
.score-box .lbl{font-size:12.5px;color:var(--text-dim);margin-top:2px;}
.checklist{flex:1;min-width:260px;display:flex;flex-direction:column;gap:8px;}
.check-item{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;border-radius:8px;font-size:14px;}
.check-item.ok{background:var(--good-bg);color:var(--good);}
.check-item.warn{background:var(--warn-bg);color:var(--warn);}
.check-item.bad{background:var(--bad-bg);color:var(--bad);}
.check-item .name{font-weight:500;}
.check-item .meta{font-size:12px;opacity:.85;}

.snippet-box{background:#14161C;color:#D9DEE8;border-radius:8px;padding:14px 16px;font-family:ui-monospace,'SFMono-Regular',Consolas,monospace;font-size:12.5px;overflow-x:auto;white-space:pre;margin-top:10px;}
.copy-btn{margin-top:8px;}

/* upload + preview */
.uploadzone{border:1.5px dashed var(--border);border-radius:12px;padding:22px;text-align:center;background:var(--surface);cursor:pointer;}
.uploadzone.drag{border-color:var(--accent);background:var(--accent-light);}
.uploadzone p{margin:0;color:var(--text-dim);font-size:14px;}
.uploadzone input{display:none;}

.previewgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:14px;margin-top:20px;}
.preview-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:14px;}
.preview-card .ctxlabel{font-size:11.5px;color:var(--text-dim);margin-bottom:10px;display:flex;align-items:center;gap:6px;}
.tabmock{display:flex;align-items:center;gap:7px;background:var(--bg);border-radius:7px 7px 0 0;padding:7px 10px;width:fit-content;}
.tabmock img{width:14px;height:14px;border-radius:3px;}
.tabmock span{font-size:11px;}
.tabmock.dark{background:#242424;}
.tabmock.dark span{color:#eee;}
.serpmock{display:flex;align-items:center;gap:9px;}
.serpmock img{width:24px;height:24px;border-radius:50%;}
.serpmock .t{font-size:12.5px;font-weight:500;}
.serpmock .u{font-size:11px;color:var(--good);}
.mobilemock{display:flex;flex-direction:column;align-items:center;gap:5px;width:fit-content;}
.mobilemock img{width:36px;height:36px;border-radius:9px;}
.mobilemock span{font-size:9.5px;}
.crowded{display:flex;gap:2px;overflow-x:auto;padding-bottom:2px;}
.crowded .t{display:flex;align-items:center;gap:5px;background:var(--bg);border-radius:6px 6px 0 0;padding:6px 8px;flex-shrink:0;}
.crowded .t img{width:13px;height:13px;border-radius:3px;}
.crowded .t.you{border:2px solid var(--accent);}

/* section blocks */
.section{padding:44px 0;}
.section.alt{background:var(--surface);border-top:1px solid var(--border);border-bottom:1px solid var(--border);}
.grid3{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px;margin-top:24px;}
.feat{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:20px;}
.feat h3{margin-bottom:6px;}
.feat p{color:var(--text-dim);font-size:14px;margin:0;}

/* blog */
.postlist{display:flex;flex-direction:column;gap:0;margin-top:20px;}
.postlist a.postrow{display:block;padding:18px 0;border-bottom:1px solid var(--border);}
.postlist a.postrow h3{margin-bottom:4px;color:var(--text);}
.postlist a.postrow p{margin:0;color:var(--text-dim);font-size:14px;}
article.post{padding:40px 0 60px;}
article.post .meta{color:var(--text-dim);font-size:13px;margin-bottom:18px;}
article.post h2{margin-top:1.4em;}
article.post ul,article.post ol{padding-left:22px;}
article.post li{margin-bottom:.4em;}
article.post code{background:var(--accent-light);padding:2px 6px;border-radius:4px;font-size:13px;}
.cta-box{background:var(--accent-light);border-radius:12px;padding:20px 22px;margin:26px 0;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;}
.cta-box p{margin:0;font-weight:500;}

footer.site{border-top:1px solid var(--border);padding:32px 0;margin-top:40px;}
footer.site .wrap{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:14px;}
footer.site .flinks{display:flex;gap:18px;font-size:13.5px;}
footer.site .flinks a{color:var(--text-dim);}
footer.site .copy{font-size:13px;color:var(--text-dim);}

.empty-note{color:var(--text-dim);font-size:13.5px;padding:14px 0;}
@media(max-width:640px){
  .nav{flex-direction:column;gap:10px;align-items:flex-start;}
  .checker form{flex-direction:column;}
}