:root{
  --panel:#ffffff;
  --soft:#f7fbff;
  --text:#0f172a;
  --muted:#64748b;
  --line:#d9e4f0;
  --blue:#1E3A8A;
  --shadow:0 20px 50px rgba(15, 23, 42, 0.08);
  --radius:24px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  color:var(--text);
  background:linear-gradient(180deg,#eef5fb 0%, #f7fafc 100%);
}
.shell{max-width:1440px;margin:0 auto;padding:24px 20px 48px}
.topbar{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin-bottom:24px}
.brand-wrap{display:flex;align-items:center;gap:20px}
.brand-logo{width:140px;height:140px;object-fit:contain;border-radius:28px;background:#fff;padding:8px;box-shadow:var(--shadow)}
.brand-copy{max-width:760px}
.eyebrow{display:inline-block;font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:#67809b;border:1px solid var(--line);background:#fff;border-radius:999px;padding:10px 14px;margin-bottom:12px}
.brand-title{margin:0 0 8px;font-size:64px;line-height:1;letter-spacing:-.04em;font-weight:800}
.brand-sub{color:var(--muted);font-size:20px}
.build-badge{white-space:nowrap;border:1px solid var(--line);background:#fff;color:#6f859c;border-radius:999px;padding:12px 16px;font-size:13px;align-self:flex-start}
.intro-card,.connect-card,.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.intro-card{display:flex;justify-content:space-between;gap:20px;padding:22px 24px;margin-bottom:18px}
.intro-card h2{margin:0 0 8px}
.intro-card p{margin:0;color:var(--muted)}
.intro-tags{display:flex;gap:10px;flex-wrap:wrap;align-content:flex-start}
.intro-tags span,.connect-actions .btn-small{white-space:nowrap}
.intro-tags span{display:inline-flex;align-items:center;border:1px solid var(--line);background:#fff;border-radius:999px;padding:10px 14px;color:#5a738c;font-size:13px}
.connect-card{display:flex;justify-content:space-between;gap:18px;padding:18px 22px;margin-bottom:22px}
.connect-copy h3{margin:0 0 6px}
.connect-copy p{margin:0;color:var(--muted)}
.connect-actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.app-grid{display:grid;grid-template-columns:minmax(520px, 1fr) minmax(520px, 1fr);gap:24px;align-items:start}
.panel{padding:28px}
.hidden{display:none}
h2,h3{margin:0 0 10px}
.muted{color:var(--muted);margin:0 0 16px}
input{width:100%;padding:14px 16px;border-radius:14px;border:1px solid var(--line);background:#fff;font-size:16px;outline:none}
input:focus{border-color:#8eb4d8;box-shadow:0 0 0 4px rgba(34,168,224,.08)}
.auth-panel input{margin-bottom:12px}
.stack-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px;align-items:center}
.btn,.btn-link-action{display:inline-flex;align-items:center;justify-content:center;width:100%;min-height:50px;border:none;border-radius:14px;background:linear-gradient(90deg,var(--blue),#10224f);color:#fff;font-weight:700;cursor:pointer;text-decoration:none;padding:0 16px}
.btn-secondary{background:#fff;color:var(--text);border:1px solid var(--line)}
.btn-small{width:auto;min-height:42px;padding:0 14px;font-weight:700}
.panel-head,.records-header,.share-top{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}
.upload-card{background:var(--soft);border:1px dashed #c6d6e6;border-radius:20px;padding:20px;margin:18px 0 22px}
.file-chip{display:inline-block;position:relative;overflow:hidden;margin-bottom:10px}
.file-chip input{position:absolute;inset:0;opacity:0;cursor:pointer}
.file-chip span{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 16px;border-radius:14px;background:#fff;border:1px solid var(--line);font-weight:700}
.selected-file{margin-bottom:14px;color:var(--muted);font-size:15px;word-break:break-word}
.records{display:grid;gap:14px}
.record{display:grid;grid-template-columns:1fr auto;gap:14px;align-items:center;border:1px solid var(--line);border-radius:18px;padding:18px;background:#fff}
.record-name{font-weight:700;font-size:18px;word-break:break-word}
.record-meta{color:var(--muted);font-size:14px;margin-top:4px}
.record-actions{display:flex;gap:10px}
.message{margin-top:14px;min-height:20px;color:#334155;font-size:14px}
.empty{border:1px dashed var(--line);border-radius:18px;padding:26px;text-align:center;color:var(--muted);background:#fbfdff}
.field,.result-row{margin-bottom:14px}
.field label,.result-row span{display:block;color:var(--muted);font-size:13px;margin-bottom:6px}
.readonly{min-height:48px;display:flex;align-items:center;border:1px solid var(--line);border-radius:14px;padding:0 16px;background:#fff;font-weight:700}
.share-result{margin-top:22px;padding-top:18px;border-top:1px solid var(--line)}
.result-title{font-size:18px;font-weight:800;margin-bottom:14px}
.result-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.result-row strong{display:block;font-size:15px;color:var(--text);word-break:break-word}
.share-link{display:block;color:var(--blue);text-decoration:none;word-break:break-all;font-weight:700;margin-top:4px}
@media (max-width: 1180px){
  .app-grid{grid-template-columns:1fr}
  .brand-title{font-size:52px}
  .intro-card,.connect-card{flex-direction:column}
}
@media (max-width: 760px){
  .topbar{flex-direction:column}
  .brand-wrap{flex-direction:column;align-items:flex-start}
  .brand-logo{width:110px;height:110px}
  .stack-actions{grid-template-columns:1fr}
  .record{grid-template-columns:1fr}
  .record-actions{justify-content:flex-start}
  .result-grid{grid-template-columns:1fr}
}

.specs-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px 24px;margin-bottom:22px}
.specs-head{display:flex;justify-content:space-between;gap:20px;align-items:flex-start}
.specs-head p{margin:0;color:var(--muted)}
.specs-tags{justify-content:flex-end;max-width:420px}
.specs-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:18px}
.spec-item{border:1px solid var(--line);border-radius:18px;padding:16px 18px;background:#fff}
.spec-item h4{margin:0 0 8px;font-size:16px}
.spec-item p{margin:0;color:var(--muted);line-height:1.55}
.spec-item code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.92em;background:#f3f7fb;border:1px solid var(--line);padding:1px 5px;border-radius:8px}
.site-footer{display:flex;justify-content:center;gap:10px;align-items:center;margin-top:26px;color:var(--muted);font-size:14px}
.site-footer a{color:var(--blue);text-decoration:none;font-weight:700}
.site-footer a:hover{text-decoration:underline}
@media (max-width: 980px){.specs-head{flex-direction:column}.specs-grid{grid-template-columns:1fr}}