:root{
  --bg:#f5f7fb; --card:#ffffff; --muted:#6b7280; --accent:#0071e3; --glass: rgba(255,255,255,0.6);
  --radius:14px; --pad:18px; --shadow: 0 6px 18px rgba(18,20,24,0.06);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial;
}
*{box-sizing:border-box}
body{margin:0;background:linear-gradient(180deg,#f7f9fc 0%,var(--bg) 100%);color:#0b1220}
.app{max-width:1100px;margin:36px auto;padding:22px}

header{display:flex;align-items:center;gap:16px;margin-bottom:22px}
.logo{width:56px;height:56px;border-radius:12px;background:linear-gradient(180deg,#fff,#eef6ff);display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow)}
.logo svg{width:34px;height:34px;opacity:0.92}
h1{font-size:20px;margin:0}
p.lead{margin:0;color:var(--muted)}

.layout{display:grid;grid-template-columns:220px 1fr 360px;gap:20px}

.sidebar{background:var(--card);padding:14px;border-radius:12px;box-shadow:var(--shadow)}
.categories{display:flex;flex-direction:column;gap:8px}
.cat{padding:10px;border-radius:10px;cursor:pointer;border:1px solid transparent}
.cat:hover{background:#f2f7ff}
.cat.active{background:linear-gradient(180deg,#f1f8ff,#eef6ff);border-color:#d6e9ff}

.main{min-height:520px}
.controls{display:flex;gap:12px;align-items:center;margin-bottom:12px}
.search{flex:1}
.search input{width:100%;padding:12px;border-radius:12px;border:1px solid #e6eefc;background:transparent}

.devices{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px}
.device{background:var(--card);padding:14px;border-radius:12px;box-shadow:var(--shadow);cursor:pointer;transition:transform .12s}
.device:hover{transform:translateY(-6px)}
.device h3{margin:8px 0 4px;font-size:15px}
.device p{margin:0;color:var(--muted);font-size:13px}

.details{background:linear-gradient(180deg,rgba(255,255,255,0.9),var(--card));padding:18px;border-radius:12px;box-shadow:var(--shadow)}
.details h2{margin:0 0 6px}
.meta{color:var(--muted);font-size:13px;margin-bottom:12px}
.box-list{display:flex;flex-direction:column;gap:8px}
.box-item{padding:10px;border-radius:10px;background:linear-gradient(180deg,#fff,#fbfdff);border:1px solid #f0f6ff}

footer{margin-top:18px;color:var(--muted);font-size:13px;text-align:center}

/* responsive */
@media (max-width:980px){.layout{grid-template-columns:1fr;}.details{order:3}}