:root{
  --bg:#f5f7f8;
  --card:#fff;
  --text:#172025;
  --muted:#6b777e;
  --line:#e3e8eb;
  --accent:#172025;
  --radius:20px;
}
*{box-sizing:border-box}
body{
  margin:0;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--text);
  background:linear-gradient(180deg,#fff 0,#f5f7f8 45%,#f0f3f4 100%);
  min-height:100vh
}
button,input,textarea,select{font:inherit}
button{cursor:pointer}
.shell{width:min(100%,640px);margin:0 auto;padding:28px 16px 40px}
.hero{text-align:center;padding:20px 8px 24px}
.brand{font-weight:900;letter-spacing:.18em;font-size:30px}
.brand-sub{letter-spacing:.45em;font-size:11px;margin-top:2px;color:var(--muted)}
.hero h1{font-size:30px;margin:22px 0 8px}
.hero p{margin:0;color:var(--muted);line-height:1.5}
.panel{
  background:rgba(255,255,255,.94);
  border:1px solid rgba(227,232,235,.9);
  border-radius:28px;
  padding:18px;
  box-shadow:0 14px 40px rgba(18,32,38,.07)
}
.action-card{
  width:100%;
  border:1px solid var(--line);
  background:#fff;
  border-radius:18px;
  padding:18px;
  margin:0 0 12px;
  display:flex;
  gap:14px;
  align-items:center;
  text-align:left;
  color:var(--text);
  transition:.15s ease
}
.action-card:last-child{margin-bottom:0}
.action-card:hover{transform:translateY(-1px);box-shadow:0 10px 22px rgba(18,32,38,.06)}
.action-card.primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.icon{
  flex:0 0 42px;height:42px;border-radius:13px;
  display:grid;place-items:center;background:#f1f4f5;font-size:22px
}
.primary .icon{background:rgba(255,255,255,.14)}
.action-card b{display:block;font-size:16px;margin-bottom:4px}
.action-card small{display:block;color:var(--muted);line-height:1.4}
.primary small{color:#d5dcdf}
.hidden{display:none!important}
.page h2{margin:14px 0 20px;font-size:24px}
.back{border:0;background:transparent;padding:4px 0;color:var(--muted)}
form{display:grid;gap:15px}
label{display:grid;gap:7px;font-weight:650;font-size:14px}
.optional{font-weight:500;color:var(--muted)}
input,textarea,select{
  width:100%;border:1px solid var(--line);background:#fff;border-radius:14px;
  padding:13px 14px;outline:none;color:var(--text)
}
input:focus,textarea:focus,select:focus{border-color:#98a4aa;box-shadow:0 0 0 3px rgba(152,164,170,.14)}
textarea{resize:vertical}
label small{font-weight:500;color:var(--muted)}
.submit{
  border:0;background:var(--accent);color:#fff;border-radius:14px;
  padding:14px 18px;font-weight:800;margin-top:4px
}
.submit:disabled{opacity:.6;cursor:not-allowed}
.result{
  margin-top:18px;padding:15px;border-radius:14px;background:#f3f6f7;
  line-height:1.55;border:1px solid var(--line)
}
.result.error{background:#fff4f3;border-color:#ffd1cd}
.warranty-card{
  padding:14px;border:1px solid var(--line);border-radius:14px;background:#fff;margin-top:10px
}
.warranty-card:first-child{margin-top:0}
.warranty-card strong{display:block;margin-bottom:8px}
.meta{display:grid;grid-template-columns:120px 1fr;gap:6px;font-size:14px}
.meta span:nth-child(odd){color:var(--muted)}
footer{text-align:center;color:var(--muted);font-size:12px;padding:22px 0 0}
@media(max-width:480px){
  .shell{padding:12px 12px 28px}
  .hero{padding:14px 5px 18px}
  .hero h1{font-size:26px}
  .panel{border-radius:22px;padding:14px}
  .action-card{padding:16px}
  .meta{grid-template-columns:105px 1fr}
}