:root {
  --bg: #09100f;
  --panel: #101a18;
  --panel-2: #14211e;
  --line: #24332f;
  --text: #eff8f4;
  --muted: #8fa29c;
  --green: #70f1ad;
  --green-2: #2cc978;
  --amber: #ffc766;
  --red: #ff7373;
  --blue: #73b6ff;
  --radius: 18px;
  --shadow: 0 18px 50px rgba(0, 0, 0, .24);
}

* { box-sizing: border-box; }
body { margin: 0; min-width: 320px; background: radial-gradient(circle at 70% -10%, #15352b 0, transparent 38%), var(--bg); color: var(--text); font: 14px/1.45 Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif; }
button, input, select, textarea { font: inherit; }
button { color: inherit; }
.hidden { display: none !important; }
.shell { min-height: 100vh; }
.topbar { height: 86px; padding: 0 28px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); background: rgba(9, 16, 15, .78); backdrop-filter: blur(16px); position: sticky; top: 0; z-index: 20; }
.brand, .top-actions, .device-meta, .relay-control, .dialog-heading, .dialog-actions, .command-actions { display: flex; align-items: center; }
.brand { gap: 14px; }
.brand-mark { width: 48px; height: 48px; display: grid; place-items: center; border-radius: 14px; color: #062015; background: linear-gradient(135deg, var(--green), #b2ffd4); font-weight: 900; box-shadow: 0 0 28px rgba(112, 241, 173, .18); }
h1, h2, p { margin: 0; }
h1 { font-size: 20px; letter-spacing: -.02em; }
h2 { font-size: 19px; letter-spacing: -.02em; }
.eyebrow { color: var(--green); font-size: 10px; font-weight: 800; letter-spacing: .16em; margin-bottom: 3px; }
.top-actions { gap: 12px; }
.status-pill { height: 38px; padding: 0 14px; display: flex; align-items: center; gap: 8px; border: 1px solid var(--line); border-radius: 99px; background: var(--panel); color: var(--muted); }
.status-pill span { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); }
.status-pill.online { color: var(--green); border-color: rgba(112, 241, 173, .25); }
.status-pill.online span { background: var(--green); box-shadow: 0 0 12px var(--green); }
.status-pill.connecting { color: var(--amber); }
.status-pill.connecting span { background: var(--amber); animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .35; } }
.workspace { display: grid; grid-template-columns: 290px minmax(0, 1fr); gap: 18px; padding: 18px; max-width: 1500px; margin: 0 auto; }
.panel { border: 1px solid var(--line); border-radius: var(--radius); background: linear-gradient(145deg, rgba(20, 33, 30, .96), rgba(14, 24, 22, .96)); box-shadow: var(--shadow); }
.sidebar { height: calc(100vh - 122px); min-height: 560px; position: sticky; top: 104px; padding: 18px 10px 14px; overflow: auto; }
.panel-heading { display: flex; justify-content: space-between; align-items: center; padding: 0 8px 16px; }
.panel-heading.compact { padding: 0 0 18px; }
.panel-heading h2 span { color: var(--muted); font-weight: 500; }
.icon-button { border: 0; background: transparent; width: 36px; height: 36px; display: grid; place-items: center; border-radius: 10px; cursor: pointer; color: var(--muted); font-size: 20px; }
.icon-button:hover { background: var(--panel-2); color: var(--text); }
.empty-state { padding: 80px 15px; text-align: center; color: var(--muted); }
.empty-state b, .empty-state small { display: block; }
.empty-state b { color: var(--text); margin: 18px 0 5px; }
.empty-state small { word-break: break-all; }
.radio-rings { height: 40px; position: relative; }
.radio-rings i { position: absolute; left: 50%; top: 50%; border: 1px solid var(--green); border-radius: 50%; transform: translate(-50%, -50%); opacity: .55; }
.radio-rings i:nth-child(1) { width: 10px; height: 10px; background: var(--green); }
.radio-rings i:nth-child(2) { width: 28px; height: 28px; }
.radio-rings i:nth-child(3) { width: 48px; height: 48px; opacity: .2; }
.device-list { display: grid; gap: 8px; }
.device-item { width: 100%; border: 1px solid transparent; border-radius: 14px; background: transparent; color: inherit; padding: 13px; text-align: left; cursor: pointer; }
.device-item:hover { background: rgba(255,255,255,.025); }
.device-item.active { border-color: rgba(112,241,173,.25); background: rgba(112,241,173,.08); }
.device-item-head { display: flex; justify-content: space-between; gap: 8px; align-items: center; }
.device-item strong { font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.device-item small { color: var(--muted); display: block; margin-top: 5px; }
.device-state { font-size: 10px; font-weight: 800; color: var(--muted); }
.device-state.on { color: var(--green); }
.device-state.offline { color: var(--red); }
.content { min-width: 0; }
.welcome { min-height: calc(100vh - 122px); display: grid; place-items: center; text-align: center; padding: 30px; }
.welcome > div:last-child { max-width: 540px; }
.welcome-icon { margin: 0 auto 22px; width: 80px; height: 80px; display: grid; place-items: center; border: 1px solid rgba(112,241,173,.2); border-radius: 24px; color: var(--green); background: rgba(112,241,173,.06); font-size: 42px; }
.welcome h2 { font-size: 30px; margin-bottom: 10px; }
.welcome p { color: var(--muted); font-size: 15px; margin-bottom: 24px; }
.dashboard { display: grid; gap: 16px; }
.device-hero { padding: 22px 24px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.device-hero h2 { font-size: 26px; }
.device-meta { gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.device-meta span { color: var(--muted); font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: 11px; }
.device-meta span + span::before { content: "·"; margin-right: 8px; color: #496057; }
.relay-control { gap: 18px; padding-left: 22px; border-left: 1px solid var(--line); }
.relay-control small { display: block; color: var(--muted); font-size: 10px; font-weight: 700; }
.relay-control strong { color: var(--muted); }
.relay-control strong.on { color: var(--green); }
.switch { position: relative; display: inline-block; width: 62px; height: 34px; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch span { position: absolute; inset: 0; border-radius: 99px; background: #26332f; border: 1px solid #35443f; cursor: pointer; transition: .2s; }
.switch span::before { content: ""; position: absolute; width: 26px; height: 26px; left: 3px; top: 3px; border-radius: 50%; background: #91a09b; transition: .2s; }
.switch input:checked + span { background: rgba(44,201,120,.25); border-color: var(--green-2); }
.switch input:checked + span::before { transform: translateX(28px); background: var(--green); box-shadow: 0 0 18px rgba(112,241,173,.45); }
.switch input:disabled + span { opacity: .45; cursor: not-allowed; }
.metrics-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 12px; }
.metric { padding: 18px; position: relative; overflow: hidden; }
.metric > span { color: var(--muted); font-size: 12px; }
.metric strong { display: block; margin: 8px 0 3px; font-size: 22px; white-space: nowrap; }
.metric strong i { font-style: normal; }
.metric small { color: #698078; font-size: 10px; }
.metric.power-accent::after { content: ""; position: absolute; width: 90px; height: 90px; background: var(--green); opacity: .07; filter: blur(20px); right: -30px; bottom: -30px; }
.lower-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(320px, .85fr); gap: 16px; }
.command-panel, .packet-panel, .log-panel { padding: 22px; }
.form-field { display: grid; gap: 7px; margin-bottom: 13px; }
.form-field label { color: var(--muted); font-size: 11px; font-weight: 700; }
input, select, textarea { width: 100%; color: var(--text); border: 1px solid var(--line); background: #0b1412; border-radius: 10px; padding: 11px 12px; outline: none; }
input:focus, select:focus, textarea:focus { border-color: var(--green-2); box-shadow: 0 0 0 3px rgba(44,201,120,.1); }
textarea { resize: vertical; font-family: ui-monospace, SFMono-Regular, Consolas, monospace; }
.command-info { min-height: 42px; color: var(--muted); font-size: 12px; margin: -3px 0 12px; }
.command-info .firmware { display: inline-block; color: var(--amber); border: 1px solid rgba(255,199,102,.2); padding: 2px 7px; border-radius: 99px; margin-right: 7px; }
.command-fields { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 0 12px; }
.command-fields .wide { grid-column: 1 / -1; }
.payload-preview { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 5px 0 16px; }
.payload-preview div { min-width: 0; padding: 10px 12px; background: #0b1412; border: 1px solid var(--line); border-radius: 10px; }
.payload-preview span { display: block; color: var(--muted); font-size: 9px; font-weight: 800; }
.payload-preview code { display: block; margin-top: 4px; color: var(--green); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.button { border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; cursor: pointer; font-weight: 750; background: var(--panel-2); }
.button:hover { filter: brightness(1.1); }
.button.primary { color: #062015; border-color: var(--green); background: var(--green); }
.button.ghost { color: var(--muted); background: transparent; }
.button.danger { color: var(--red); background: rgba(255,115,115,.08); border-color: rgba(255,115,115,.25); }
.button.small { padding: 7px 10px; font-size: 11px; }
.confirmed-check, .remember { color: var(--muted); font-size: 12px; }
.confirmed-check input, .remember input { width: auto; accent-color: var(--green-2); }
.inline-message { min-height: 18px; margin-top: 12px; font-size: 12px; color: var(--muted); }
.inline-message.error { color: var(--red); }
.inline-message.ok { color: var(--green); }
.packet-details { margin: 0; display: grid; gap: 10px; }
.packet-details div { padding: 10px 12px; background: #0b1412; border: 1px solid var(--line); border-radius: 10px; min-width: 0; }
.packet-details dt { color: var(--muted); font-size: 9px; font-weight: 800; }
.packet-details dd { margin: 3px 0 0; font: 12px/1.4 ui-monospace, SFMono-Regular, Consolas, monospace; overflow-wrap: anywhere; }
.response-list { margin-top: 12px; max-height: 190px; overflow: auto; display: grid; gap: 7px; }
.response-item { padding: 9px 11px; border-left: 2px solid var(--blue); background: rgba(115,182,255,.06); border-radius: 4px 9px 9px 4px; }
.response-item b { color: var(--blue); font-family: ui-monospace, monospace; margin-right: 7px; }
.response-item small { color: var(--muted); display: block; margin-top: 2px; }
.muted { color: var(--muted); }
.log-panel { min-height: 230px; }
.event-log { max-height: 290px; overflow: auto; font: 11px/1.5 ui-monospace, SFMono-Regular, Consolas, monospace; }
.log-row { display: grid; grid-template-columns: 72px 56px minmax(0,1fr); gap: 10px; padding: 7px 4px; border-top: 1px solid rgba(36,51,47,.65); }
.log-row time { color: #667c74; }
.log-row .kind { color: var(--blue); font-weight: 800; }
.log-row.down .kind { color: var(--amber); }
.log-row.error .kind { color: var(--red); }
.log-row span:last-child { overflow-wrap: anywhere; color: #adc0ba; }
dialog { border: 0; padding: 0; color: var(--text); background: transparent; width: min(650px, calc(100vw - 28px)); }
dialog::backdrop { background: rgba(0,0,0,.68); backdrop-filter: blur(6px); }
.dialog-card { padding: 24px; border: 1px solid var(--line); border-radius: 20px; background: #101a18; box-shadow: 0 30px 90px rgba(0,0,0,.55); }
.dialog-card.narrow { max-width: 520px; margin: auto; }
.dialog-heading { justify-content: space-between; margin-bottom: 18px; }
.notice { color: #adc0ba; padding: 11px 13px; margin-bottom: 16px; border-left: 2px solid var(--blue); background: rgba(115,182,255,.07); border-radius: 4px 10px 10px 4px; font-size: 12px; }
.notice.warning { border-color: var(--amber); background: rgba(255,199,102,.07); }
.notice code { color: var(--blue); }
.two-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
details { border: 1px solid var(--line); border-radius: 12px; margin: 4px 0 14px; }
summary { padding: 11px 13px; cursor: pointer; color: var(--muted); }
.details-body { padding: 2px 13px 4px; }
.remember { display: block; margin: 12px 0; }
.dialog-actions { justify-content: flex-end; gap: 9px; margin-top: 18px; }
.dialog-actions .danger { margin-right: auto; }
.toast-region { position: fixed; right: 18px; bottom: 18px; z-index: 50; display: grid; gap: 8px; width: min(380px, calc(100vw - 36px)); }
.toast { padding: 12px 14px; border: 1px solid var(--line); border-radius: 12px; background: #16231f; box-shadow: var(--shadow); animation: toast-in .2s ease-out; }
.toast.ok { border-color: rgba(112,241,173,.3); }
.toast.error { border-color: rgba(255,115,115,.35); }
@keyframes toast-in { from { transform: translateY(8px); opacity: 0; } }

@media (max-width: 1100px) {
  .metrics-grid { grid-template-columns: repeat(3, 1fr); }
  .lower-grid { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .topbar { height: auto; padding: 14px 16px; align-items: flex-start; }
  .top-actions { flex-direction: column; align-items: flex-end; }
  .workspace { grid-template-columns: 1fr; padding: 12px; }
  .sidebar { position: static; height: auto; min-height: 0; max-height: 260px; }
  .welcome { min-height: 520px; }
  .device-hero { align-items: flex-start; flex-direction: column; }
  .relay-control { width: 100%; padding: 14px 0 0; border-left: 0; border-top: 1px solid var(--line); justify-content: space-between; }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .command-fields, .payload-preview, .two-columns { grid-template-columns: 1fr; }
  .command-fields .wide { grid-column: auto; }
  .log-row { grid-template-columns: 62px 48px minmax(0,1fr); gap: 6px; }
}