*{box-sizing:border-box}
:root{
    font-family:Inter,Arial,sans-serif;
    color:#172033;
    background:#f4f7fb;
}
body{margin:0;min-height:100vh;background:#f4f7fb}
a{color:inherit}
.topbar{
    min-height:68px;background:#111827;color:#fff;padding:0 5%;
    display:flex;align-items:center;justify-content:space-between;gap:24px
}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-weight:700}
.brand-mark{
    display:inline-grid;place-items:center;width:42px;height:42px;
    border-radius:10px;background:#2563eb
}
.account{display:flex;align-items:center;gap:14px}
.account form{margin:0}
.main-nav{
    background:#fff;border-bottom:1px solid #e2e8f0;padding:0 5%;
    display:flex;gap:6px
}
.main-nav a{
    padding:14px 16px;text-decoration:none;color:#475569;
    border-bottom:3px solid transparent
}
.main-nav a.active{color:#1d4ed8;border-bottom-color:#2563eb;font-weight:700}
.container{width:min(1120px,90%);margin:38px auto}
.narrow{width:min(680px,90%)}
.login-card,.panel,.metric-card,.device-card,.empty-state,
.secret-card,.warning-card,.control-card{
    background:#fff;border:1px solid #e3e8ef;border-radius:16px;
    box-shadow:0 8px 25px rgba(15,23,42,.06)
}
.login-card{max-width:480px;margin:55px auto;padding:32px}
.panel,.empty-state,.secret-card,.warning-card{padding:28px}
.secret-card{border-color:#93c5fd;background:#eff6ff}
.warning-card{border-color:#fdba74;background:#fff7ed}
.login-card h1,.panel h1,.panel h2,.device-card h2{margin-top:0}
label{display:block;font-weight:700;margin:18px 0 7px}
input,textarea{
    width:100%;padding:13px 14px;border:1px solid #cbd5e1;
    border-radius:9px;font:inherit;background:#fff
}
textarea{resize:vertical;font-family:ui-monospace,Consolas,monospace}
input:focus,textarea:focus{
    outline:3px solid rgba(37,99,235,.15);border-color:#2563eb
}
.button{
    display:inline-flex;align-items:center;justify-content:center;border:0;
    border-radius:9px;padding:11px 16px;font-weight:700;
    text-decoration:none;cursor:pointer;transition:.15s ease
}
.button:hover{transform:translateY(-1px)}
.button:disabled{opacity:.55;cursor:wait;transform:none}
.button-primary{background:#2563eb;color:#fff}
.button-secondary{background:#475569;color:#fff}
.button-warning{background:#d97706;color:#fff}
.button-danger{background:#b91c1c;color:#fff}
.button-ghost{background:#e2e8f0;color:#334155}
.full-width{width:100%;margin-top:22px}
.button-row,.action-grid,.control-buttons{
    display:flex;gap:12px;flex-wrap:wrap;margin-top:20px
}
.action-grid form{margin:0}
.alert{padding:13px 15px;border-radius:9px;margin:18px 0}
.alert-error{background:#fef2f2;color:#991b1b;border:1px solid #fecaca}
.alert-success{background:#ecfdf5;color:#166534;border:1px solid #bbf7d0}
.page-heading{
    display:flex;justify-content:space-between;align-items:center;
    gap:20px;margin-bottom:24px
}
.page-heading h1{margin:0 0 6px}
.page-heading p{margin:0;color:#64748b}
.card-grid{
    display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:24px
}
.metric-card{padding:24px}
.metric-card strong{display:block;font-size:38px;margin-top:10px}
.metric-label,.muted{color:#64748b}
.footer{text-align:center;color:#64748b;padding:28px}
.device-grid{
    display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:20px
}
.device-card{padding:22px}
.device-card-header{
    display:flex;justify-content:space-between;gap:16px;align-items:flex-start
}
.device-card h2{margin-bottom:4px}
.led-summary{
    display:flex;gap:18px;padding:14px 0;margin:15px 0;
    border-top:1px solid #e5e7eb;border-bottom:1px solid #e5e7eb
}
.badge{
    display:inline-flex;padding:7px 10px;border-radius:999px;
    font-size:.85rem;font-weight:700;white-space:nowrap
}
.badge-online{background:#dcfce7;color:#166534}
.badge-offline{background:#fee2e2;color:#991b1b}
.badge-disabled{background:#e5e7eb;color:#475569}
.form-panel{max-width:850px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 22px;margin-bottom:22px}
.form-span{grid-column:1/-1}
.detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:20px}
.data-list{margin:20px 0 0}
.data-list div{
    display:grid;grid-template-columns:160px 1fr;gap:15px;
    padding:10px 0;border-bottom:1px solid #e5e7eb
}
.data-list dt{font-weight:700}
.data-list dd{margin:0;overflow-wrap:anywhere}
.led-detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.led-box{
    display:grid;gap:7px;text-align:center;padding:22px;border-radius:13px;
    background:#f1f5f9;border:1px solid #cbd5e1
}
.led-box.is-on{background:#dcfce7;border-color:#86efac}
.led-box span{font-size:26px;font-weight:800}
.led-box small{color:#64748b}
.table-scroll{overflow-x:auto}
.data-table,.test-table{width:100%;border-collapse:collapse;margin:20px 0}
.data-table th,.data-table td,.test-table th,.test-table td{
    text-align:left;padding:12px;border-bottom:1px solid #e5e7eb
}
.test-ok{color:#166534;font-weight:700}
.test-error{color:#991b1b;font-weight:700}
code{background:#eef2f7;padding:2px 5px;border-radius:4px}

.control-hero{
    display:flex;justify-content:space-between;gap:24px;align-items:center;
    padding:24px 28px;margin-bottom:20px;border-radius:18px;
    background:#111827;color:#fff
}
.eyebrow{
    display:block;font-size:.78rem;letter-spacing:.08em;
    text-transform:uppercase;color:#94a3b8;font-weight:800
}
.connection-state{font-size:2rem;font-weight:900;margin-top:4px}
.connection-state.is-online{color:#4ade80}
.connection-state.is-offline{color:#f87171}
.communication-box{text-align:right;display:grid;gap:4px}
.communication-box span,.communication-box small{color:#cbd5e1}
.web-control-grid{
    display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:20px
}
.control-card{padding:28px}
.control-card-title{
    display:flex;align-items:flex-start;justify-content:space-between;gap:18px
}
.control-card h2{font-size:1.6rem;margin:3px 0 0}
.virtual-led{
    width:68px;height:68px;border-radius:50%;
    background:#cbd5e1;border:7px solid #e2e8f0;
    box-shadow:inset 0 2px 8px rgba(15,23,42,.2)
}
.virtual-led.is-on{
    background:#22c55e;border-color:#bbf7d0;
    box-shadow:0 0 28px rgba(34,197,94,.45), inset 0 2px 6px rgba(255,255,255,.5)
}
.large-state{font-size:1.5rem;font-weight:900;margin:24px 0 8px}
.origin-line{color:#64748b}
.panel-heading-row{
    display:flex;align-items:center;justify-content:space-between;gap:18px
}
.panel-heading-row h2{margin-bottom:4px}
.toast-message{
    position:fixed;right:24px;bottom:24px;z-index:99;
    background:#111827;color:#fff;padding:14px 18px;border-radius:12px;
    box-shadow:0 12px 30px rgba(15,23,42,.25)
}
.toast-message.is-error{background:#991b1b}

@media(max-width:760px){
    .topbar,.page-heading,.account,.control-hero{
        align-items:flex-start;flex-direction:column
    }
    .topbar{padding:18px 5%}
    .card-grid,.detail-grid,.form-grid,.web-control-grid{grid-template-columns:1fr}
    .form-span{grid-column:auto}
    .main-nav{overflow-x:auto}
    .data-list div{grid-template-columns:1fr}
    .led-detail-grid{grid-template-columns:1fr}
    .communication-box{text-align:left}
    .panel-heading-row{align-items:flex-start;flex-direction:column}
}


.channel-name-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.no-margin{margin-top:0}
.control-buttons form{margin:0}
@media(max-width:760px){.channel-name-grid{grid-template-columns:1fr}}