:root{--bg:#f5f7fb;--panel:#fff;--panel2:#f9fafc;--text:#152033;--muted:#6f7a8f;--line:#e6eaf1;--primary:#5b6df8;--primary2:#7b61ff;--danger:#d94c55;--success:#1e9d69;--shadow:0 12px 38px rgba(31,42,68,.08);--radius:20px}*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text)}a{text-decoration:none;color:inherit}button,input,select,textarea{font:inherit}.app-shell{display:grid;grid-template-columns:260px 1fr;min-height:100vh}.sidebar{position:sticky;top:0;height:100vh;background:#101727;color:#e8ecf7;padding:22px 16px;display:flex;flex-direction:column;z-index:20}.brand{display:flex;gap:12px;align-items:center;padding:4px 8px 24px}.brand-mark,.login-logo{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;font-weight:800;color:white;background:linear-gradient(135deg,var(--primary),var(--primary2));box-shadow:0 8px 24px rgba(91,109,248,.35)}.brand span:last-child{display:flex;flex-direction:column}.brand small,.user-mini small{color:#8e9ab1;font-size:12px;margin-top:3px}.sidebar nav{display:grid;gap:6px}.sidebar nav a{display:flex;gap:12px;align-items:center;padding:11px 12px;border-radius:12px;color:#b9c2d4;transition:.18s}.sidebar nav a:hover{background:#1a2335;color:white}.sidebar-footer{margin-top:auto;border-top:1px solid #263045;padding:16px 8px 0;display:flex;gap:10px;align-items:center}.avatar{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;background:#222d43;color:white;font-weight:700}.user-mini{min-width:0;display:flex;flex-direction:column}.user-mini strong,.user-mini small{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:160px}.main{min-width:0}.topbar{height:86px;padding:18px 30px;border-bottom:1px solid var(--line);background:rgba(255,255,255,.82);backdrop-filter:blur(18px);display:flex;align-items:center;gap:16px;position:sticky;top:0;z-index:10}.topbar h1{font-size:20px;margin:0}.topbar p{margin:3px 0 0;color:var(--muted);font-size:13px}.logout-form{margin-left:auto}.content{padding:28px 30px 48px;max-width:1500px;width:100%}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:18px}.stat-card,.card,.hero-card,.device-card{background:var(--panel);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:var(--radius)}.stat-card{padding:20px}.stat-card span,.stat-card em{display:block;color:var(--muted);font-style:normal}.stat-card strong{font-size:34px;display:block;margin:12px 0 4px}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:18px}.card{padding:22px}.card h2{margin:0 0 18px;font-size:18px}.card-head,.page-actions,.row-actions,.form-actions{display:flex;align-items:center;gap:10px}.card-head{justify-content:space-between;margin-bottom:16px}.card-head h2,.page-actions h2{margin:0}.card-head p,.page-actions p,.hero-card p,.device-card p{margin:4px 0 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var(--line);font-size:13px;vertical-align:middle}th{background:var(--panel2);color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:.04em}tbody tr:hover{background:#fbfcff}.form-card{max-width:920px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}.stack{display:grid;gap:15px}.span-2{grid-column:1/-1}.span-all{grid-column:1/-1}label{display:grid;gap:7px;color:#3a4559;font-size:13px;font-weight:600}input,select,textarea{width:100%;border:1px solid #dce2ec;border-radius:11px;padding:11px 12px;background:#fff;color:#172033;outline:none;transition:.15s}input:focus,select:focus,textarea:focus{border-color:#8f9cff;box-shadow:0 0 0 3px rgba(91,109,248,.12)}textarea{resize:vertical}.managed-box{display:none}.managed-visible .managed-box{display:grid}.info-box{padding:13px;border-radius:12px;background:#f2f5ff;color:#5261a5;font-size:13px}.alert{padding:13px 15px;border-radius:12px;margin-bottom:16px;border:1px 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@media(prefers-color-scheme:dark){:root{--bg:#0d1220;--panel:#151c2b;--panel2:#121927;--text:#edf1f8;--muted:#94a0b5;--line:#283246;--shadow:0 12px 38px rgba(0,0,0,.24)}.topbar{background:rgba(15,21,34,.86)}.btn{background:#192235;color:#edf1f8;border-color:#303a4d}.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary2))}.btn-danger{background:#2a1820}.stat-card,.card,.hero-card,.device-card{background:var(--panel)}input,select,textarea{background:#101827;color:#eef2f9;border-color:#344059}.hero-card{background:linear-gradient(135deg,#151c2b,#1d1933)}.hero-metric{background:#111827}.login-card{background:#141b2a}}