:root {
  --bg: #f2f4f6;
  --surface: #ffffff;
  --surface-2: #eef1f4;
  --ink: #1c2126;
  --ink-2: #5b646d;
  --ink-3: #98a1a9;
  --line: #dde2e8;
  --line-soft: #e9edf1;
  --accent: #0e7490;
  --accent-ink: #ffffff;
  --accent-soft: #e0f2f7;
  --up: #0f766e;
  --up-soft: #e3f4f2;
  --down: #b45309;
  --down-soft: #fbefdc;
  --danger: #b91c1c;
  --ok: #15803d;
  --radius: 8px;
  --radius-sm: 6px;
  --font-sans: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }
html, body { height: 100%; }
body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--ink);
  font-size: 13px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

.app { height: 100vh; display: flex; flex-direction: column; overflow: hidden; }

/* ---------- 顶栏 ---------- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 20px; height: 54px; flex-shrink: 0;
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand-glyph {
  width: 30px; height: 30px; border-radius: var(--radius-sm);
  background: var(--ink); position: relative; flex-shrink: 0;
}
.brand-glyph::after {
  content: ''; position: absolute; inset: 9px 8px 8px 9px;
  border-radius: 50%; border: 2px solid var(--accent);
}
.brand-text h1 { font-size: 16px; font-weight: 600; line-height: 1.2; }
.brand-text span {
  font-family: var(--font-mono); font-size: 9.5px; color: var(--ink-3);
  letter-spacing: 0.1em; text-transform: uppercase;
}
.conn { display: flex; align-items: center; gap: 8px; color: var(--ink-2); font-size: 12px; }
.conn-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--ink-3); }
.conn-dot.on { background: var(--ok); box-shadow: 0 0 0 3px rgba(21, 128, 61, .14); }
.conn-dot.off { background: var(--danger); }

/* ---------- 按钮 ---------- */
.btn {
  font-family: var(--font-sans); font-size: 12.5px; font-weight: 500;
  padding: 7px 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  cursor: pointer; transition: border-color .12s ease, background .12s ease;
  white-space: nowrap;
}
.btn:hover { border-color: var(--ink-2); }
.btn:disabled { opacity: .55; cursor: default; }
.btn-accent { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn-accent:hover { background: #0b6179; border-color: #0b6179; }
.icon-btn {
  border: 0; background: transparent; color: var(--ink-3); font-size: 15px;
  width: 24px; height: 24px; border-radius: 5px; cursor: pointer; line-height: 1;
  flex-shrink: 0; opacity: 0;
}
.icon-btn:hover { background: var(--surface-2); color: var(--danger); }

.input, .select, .json {
  width: 100%; font-family: var(--font-sans); font-size: 12.5px;
  border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 7px 10px; background: var(--surface); color: var(--ink);
  outline: none;
}
.input:focus, .select:focus, .json:focus { border-color: var(--accent); }
.input.mono, .mono { font-family: var(--font-mono); }
.json {
  font-family: var(--font-mono); font-size: 11.5px; resize: vertical;
  line-height: 1.55;
}
.select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--ink-3) 50%), linear-gradient(135deg, var(--ink-3) 50%, transparent 50%); background-position: calc(100% - 15px) 55%, calc(100% - 11px) 55%; background-size: 4px 4px; background-repeat: no-repeat; padding-right: 26px; }

/* ---------- 三栏布局 ---------- */
.layout {
  flex: 1; display: grid;
  grid-template-columns: 250px minmax(0, 1fr) minmax(360px, 40%);
  min-height: 0;
}
.col { display: flex; flex-direction: column; min-height: 0; min-width: 0; }
.col-devices, .col-panel { border-right: 1px solid var(--line); }
.col-head {
  display: flex; align-items: center; gap: 8px;
  padding: 13px 16px 11px; flex-shrink: 0;
  font-size: 11px; font-weight: 600; letter-spacing: .08em;
  text-transform: uppercase; color: var(--ink-2);
}
.badge {
  font-family: var(--font-mono); font-size: 10px; color: var(--ink-2);
  background: var(--surface-2); border-radius: 10px; padding: 1px 7px;
}

/* ---------- 设备列 ---------- */
.devices { list-style: none; overflow-y: auto; flex: 1; padding: 0 10px 10px; }
.device {
  display: flex; align-items: center; gap: 8px;
  padding: 9px 10px; border-radius: var(--radius);
  cursor: pointer; margin-bottom: 2px; position: relative;
}
.device:hover { background: var(--surface-2); }
.device:hover .icon-btn { opacity: 1; }
.device.selected { background: var(--surface); box-shadow: inset 0 0 0 1px var(--line); }
.device.selected::before {
  content: ''; position: absolute; left: 0; top: 8px; bottom: 8px;
  width: 3px; border-radius: 2px; background: var(--accent);
}
.device-main { min-width: 0; flex: 1; }
.device-sn {
  font-family: var(--font-mono); font-size: 12.5px; font-weight: 500;
  word-break: break-all;
}
.device-type { font-size: 10.5px; color: var(--ink-3); text-transform: uppercase; letter-spacing: .05em; }

.add-form { padding: 10px; border-top: 1px solid var(--line); display: grid; gap: 8px; flex-shrink: 0; background: var(--surface); }

/* ---------- 指令面板 ---------- */
.empty {
  flex: 1; display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 8px; text-align: center; padding: 24px;
}
.empty-title { font-size: 14px; font-weight: 600; color: var(--ink-2); }
.empty-sub { font-size: 12px; color: var(--ink-3); }

#cmd-panel { flex: 1; display: flex; flex-direction: column; min-height: 0; }
.summary {
  display: flex; gap: 14px 32px; flex-wrap: wrap;
  padding: 14px 20px; border-bottom: 1px solid var(--line-soft); flex-shrink: 0;
}
.summary-item { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.summary-item .k { font-size: 10px; color: var(--ink-3); letter-spacing: .06em; }
.summary-item .v { font-size: 13px; font-weight: 500; word-break: break-all; }

.cmd-list {
  display: flex; flex-wrap: wrap; gap: 6px;
  padding: 12px 20px; border-bottom: 1px solid var(--line-soft); flex-shrink: 0;
}
.cmd-tab {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 11.5px;
  padding: 5px 10px; border-radius: var(--radius-sm);
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  cursor: pointer;
}
.cmd-tab:hover { border-color: var(--ink-2); }
.cmd-tab.active { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.cmd-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.ff-badge {
  font-size: 8.5px; font-weight: 600; color: var(--down);
  background: var(--down-soft); border-radius: 3px; padding: 1px 5px;
  letter-spacing: .04em; text-transform: uppercase;
}

#cmd-detail { overflow-y: auto; padding: 16px 20px 20px; flex: 1; }
.cmd-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.cmd-title { font-size: 15px; font-weight: 600; }
.mode-seg { display: inline-flex; border: 1px solid var(--line); border-radius: var(--radius-sm); overflow: hidden; margin-left: auto; }
.mode-seg .seg { border: 0; background: var(--surface); color: var(--ink-2); font-size: 11.5px; padding: 5px 12px; cursor: pointer; }
.mode-seg .seg.active { background: var(--surface-2); color: var(--ink); font-weight: 500; }
.cmd-desc { margin-top: 8px; font-size: 12px; color: var(--ink-2); }
.fields { margin-top: 14px; display: grid; gap: 10px; max-width: 480px; }
.frow { display: flex; align-items: center; gap: 10px; }
.frow .k { width: 86px; flex-shrink: 0; font-family: var(--font-mono); font-size: 12px; }
.frow > .input { flex: 1; }
.frow-bool { gap: 10px; }
.frow-bool input { width: 16px; height: 16px; accent-color: var(--accent); }
.frow-block { display: block; }
.frow-block .k { display: block; margin-bottom: 4px; width: auto; }
.no-params { margin-top: 12px; font-size: 12px; color: var(--ink-3); }
.cmd-actions { margin-top: 16px; display: flex; align-items: center; gap: 12px; }
.send-result { font-size: 12px; }
.send-result.ok { color: var(--ok); }
.send-result.err { color: var(--danger); word-break: break-all; }

/* ---------- 时间线 ---------- */
.filterbar {
  display: flex; gap: 5px; padding: 0 12px 10px; flex-shrink: 0;
}
.filterbar .seg {
  font-size: 11.5px; padding: 4px 10px; border-radius: var(--radius-sm);
  border: 1px solid var(--line); background: var(--surface); color: var(--ink-2);
  cursor: pointer;
}
.filterbar .seg.active { background: var(--ink); border-color: var(--ink); color: #fff; }
.spacer { flex: 1; }
.log-empty { padding: 20px; text-align: center; color: var(--ink-3); font-size: 12px; flex: 1; }
.logs {
  list-style: none; overflow-y: auto; flex: 1;
  padding: 0 10px 14px;
  display: flex; flex-direction: column; gap: 8px;
}
.log {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 9px 12px; min-width: 0;
}
.log-head { display: flex; align-items: center; gap: 9px; flex-wrap: wrap; }
.log-dir {
  font-size: 10.5px; font-weight: 600; padding: 1px 7px; border-radius: 4px;
  flex-shrink: 0;
}
.dir-up { color: var(--up); background: var(--up-soft); }
.dir-down { color: var(--down); background: var(--down-soft); }
.log-time { font-size: 11px; color: var(--ink-3); }
.log-type {
  font-size: 10px; font-weight: 600; letter-spacing: .03em; text-transform: uppercase;
  color: var(--ink-2); flex-shrink: 0;
}
.log-topic { font-size: 11px; color: var(--ink-3); margin-left: auto; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.log-payload {
  margin-top: 8px; font-family: var(--font-mono); font-size: 11.5px;
  background: var(--surface-2); border-radius: var(--radius-sm);
  padding: 8px 10px; overflow-x: auto; white-space: pre; color: var(--ink);
}

/* ---------- 提示 ---------- */
.toast {
  position: fixed; bottom: 22px; left: 50%; transform: translateX(-50%);
  background: var(--ink); color: #fff; font-size: 12.5px;
  padding: 9px 18px; border-radius: 6px; z-index: 10;
  box-shadow: 0 6px 22px rgba(0, 0, 0, .18);
}
.toast.err { background: var(--danger); }

@media (max-width: 1020px) {
  .layout { grid-template-columns: 210px minmax(0, 1fr); }
  .col-logs { grid-column: 1 / -1; border-top: 1px solid var(--line); max-height: 38vh; }
}

@media (max-width: 720px) {
  .layout { grid-template-columns: 1fr; display: flex; flex-direction: column; }
  .col-devices { max-height: 30vh; border-right: 0; border-bottom: 1px solid var(--line); }
  .col-panel { max-height: 46vh; }
  .col-logs { max-height: 34vh; }
}