:root{
  --bg:#0b0c10;
  --card:#12141b;
  --text:#e9eefc;
  --muted:#aab4d6;
  --line:#23283a;
  --accent:#6ea8fe;
  --ok:#5ef2b3;
  --warn:#ffd166;
  --bad:#ff5c7a;
  --radius:14px;
  --shadow: 0 10px 30px rgba(0,0,0,.35);
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans JP","Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1100px;margin:0 auto;padding:18px}
.site-header{position:sticky;top:0;background:rgba(11,12,16,.78);backdrop-filter: blur(10px);border-bottom:1px solid var(--line);z-index:10}
.brand{font-weight:800;letter-spacing:.02em}
.top-nav{display:flex;flex-wrap:wrap;gap:10px;justify-content:flex-end}
.site-header .wrap{display:flex;gap:14px;align-items:center;justify-content:space-between}
.nav-link{padding:8px 10px;border:1px solid transparent;border-radius:999px;color:var(--text);background:transparent}
.nav-link:hover{border-color:var(--line);background:rgba(255,255,255,.03);text-decoration:none}

.site-main{padding:18px 0}
h1{margin:0 0 12px;font-size:26px}
.lead{color:var(--muted);margin:0 0 18px;line-height:1.7}

.grid{display:grid;gap:14px}
@media(min-width:900px){.grid.cols-2{grid-template-columns:1fr 1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:14px}
.card h2{margin:0 0 10px;font-size:18px}
.label{display:block;font-size:13px;color:var(--muted);margin:10px 0 6px}
input[type="text"], input[type="url"], textarea, select{
  width:100%;background:#0e1017;color:var(--text);
  border:1px solid var(--line);border-radius:12px;padding:10px 12px;outline:none
}
textarea{min-height:110px;resize:vertical}
.row{display:flex;gap:10px;flex-wrap:wrap}
.row > *{flex:1 1 220px}
.btns{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
button{
  appearance:none;border:1px solid var(--line);background:rgba(255,255,255,.04);
  color:var(--text);padding:10px 12px;border-radius:12px;cursor:pointer
}
button:hover{background:rgba(255,255,255,.07)}
button.primary{border-color:rgba(110,168,254,.35);background:rgba(110,168,254,.12)}
.badge{display:inline-flex;gap:8px;align-items:center;padding:6px 10px;border-radius:999px;border:1px solid var(--line);font-size:13px;color:var(--muted)}
.badge .dot{width:10px;height:10px;border-radius:99px;background:var(--muted)}
.badge.ok .dot{background:var(--ok)}
.badge.warn .dot{background:var(--warn)}
.badge.bad .dot{background:var(--bad)}
.muted{color:var(--muted)}
.small{font-size:12px}
.code{font-family:var(--mono);white-space:pre-wrap;background:#0e1017;border:1px solid var(--line);border-radius:12px;padding:12px;overflow:auto}
hr{border:none;border-top:1px solid var(--line);margin:14px 0}

.site-footer{border-top:1px solid var(--line);padding:18px 0;background:rgba(255,255,255,.02)}
.footer-grid{display:grid;gap:12px}
@media(min-width:900px){.footer-grid{grid-template-columns:1.3fr 1.4fr 1fr;align-items:start}}
.footer-nav{display:flex;flex-wrap:wrap;gap:10px}
.footer-title{font-weight:800}
.kv{display:grid;gap:6px}
.kv div{display:flex;gap:8px;align-items:baseline}
.kv b{min-width:110px}

/* ---- OGP preview extras ---- */
.tabs{display:flex;gap:10px;flex-wrap:wrap;margin:8px 0 0}
.tab{
  padding:8px 12px;border:1px solid var(--line);border-radius:999px;
  background:rgba(255,255,255,.03);color:var(--text);cursor:pointer
}
.tab[aria-selected="true"]{
  border-color:rgba(110,168,254,.45);
  background:rgba(110,168,254,.14);
}
.preview-box{display:none}
.preview-box.active{display:block}

.pv-card{
  border:1px solid var(--line);border-radius:14px;overflow:hidden;
  background:#0e1017;
}
.pv-img{
  aspect-ratio: 1.91 / 1;
  background:linear-gradient(135deg, rgba(110,168,254,.18), rgba(255,92,122,.10));
  display:flex;align-items:center;justify-content:center;
  color:var(--muted);font-size:12px;text-align:center;padding:10px
}
.pv-body{padding:12px}
.pv-domain{font-size:12px;color:var(--muted);margin-bottom:6px}
.pv-title{font-weight:800;line-height:1.35;margin:0 0 6px}
.pv-desc{color:var(--muted);line-height:1.55;margin:0}
.pv-site{font-size:12px;color:var(--muted);margin-top:10px}

.pv-row{display:grid;gap:12px}
@media(min-width:900px){.pv-row{grid-template-columns:1fr 1fr}}

.helper{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:10px}
.mini{font-size:12px;color:var(--muted)}