:root {
  --bg: #f4f6f9;
  --panel: #ffffff;
  --text: #1f2933;
  --muted: #6b7785;
  --line: #e1e6ec;
  --primary: #1f6feb;
  --primary-dark: #1858c2;
  --ok: #1a7f37;
  --ok-bg: #e6f4ea;
  --warn: #9a6700;
  --warn-bg: #fff4d6;
  --bad: #c62828;
  --bad-bg: #fde8e8;
  --off: #8a94a1;
  --off-bg: #eef1f4;
  --nav: #17212b;
  --radius: 8px;
  font-family: "Noto Sans TC", "Microsoft JhengHei", "PingFang TC", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body, #root { margin: 0; height: 100%; background: var(--bg); color: var(--text); font-size: 14px; }
button, input, select, textarea { font: inherit; }
a { color: var(--primary); }
.num { font-variant-numeric: tabular-nums; }
.muted { color: var(--muted); }
.hidden { display: none !important; }

/* --- 外框 -------------------------------------------------------------- */
.layout { display: grid; grid-template-columns: 200px 1fr; grid-template-rows: 52px 1fr; height: 100%; }
.topbar {
  grid-column: 1 / 3; display: flex; align-items: center; gap: 16px;
  padding: 0 20px; background: var(--panel); border-bottom: 1px solid var(--line);
}
.topbar .brand { font-weight: 700; font-size: 16px; }
.topbar .station { padding: 2px 10px; border-radius: 99px; background: var(--off-bg); }
.topbar .spacer { flex: 1; }
.topbar .clock { color: var(--muted); }
.nav { background: var(--nav); padding: 12px 0; overflow-y: auto; }
.nav a {
  display: block; padding: 10px 20px; color: #c9d3dd; text-decoration: none;
  border-left: 3px solid transparent;
}
.nav a:hover { background: #22303d; color: #fff; }
.nav a.active { background: #22303d; color: #fff; border-left-color: var(--primary); }
.main { overflow-y: auto; padding: 20px 24px 40px; }
.main h1 { font-size: 20px; margin: 0 0 16px; }

@media (max-width: 760px) {
  .layout { grid-template-columns: 1fr; grid-template-rows: 52px auto 1fr; }
  .topbar { grid-column: 1; }
  .nav { display: flex; overflow-x: auto; padding: 0; }
  .nav a { white-space: nowrap; border-left: none; border-bottom: 3px solid transparent; }
  .nav a.active { border-bottom-color: var(--primary); }
  .main { padding: 16px 12px 40px; }
  .topbar { gap: 8px; padding: 0 10px; }
  .topbar .clock, .topbar > .muted { display: none; }
  .topbar .btn { padding: 4px 8px; font-size: 12px; white-space: nowrap; }
  .topbar .brand { font-size: 14px; white-space: nowrap; }
}

/* --- 元件 -------------------------------------------------------------- */
.card { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); }
.card + .card { margin-top: 16px; }
.card-head {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px;
  padding: 12px 16px; border-bottom: 1px solid var(--line);
}
.card-head h2 { font-size: 16px; margin: 0; }
.card-body { padding: 12px 16px; }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 12px; margin-bottom: 16px; }
.stat { background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 16px; }
.stat .label { color: var(--muted); font-size: 12px; }
.stat .value { font-size: 18px; font-weight: 600; margin-top: 4px; }
.stat .sub { color: var(--muted); font-size: 12px; margin-top: 2px; }

.badge {
  display: inline-block; padding: 1px 8px; border-radius: 99px; font-size: 12px; font-weight: 600;
  white-space: nowrap;
}
.badge.ok { color: var(--ok); background: var(--ok-bg); }
.badge.warn { color: var(--warn); background: var(--warn-bg); }
.badge.bad { color: var(--bad); background: var(--bad-bg); }
.badge.off { color: var(--off); background: var(--off-bg); }

table.grid { width: 100%; border-collapse: collapse; }
table.grid th, table.grid td { padding: 8px 10px; text-align: left; border-bottom: 1px solid var(--line); }
table.grid th { color: var(--muted); font-weight: 500; font-size: 12px; background: #fafbfc; }
table.grid td.r, table.grid th.r { text-align: right; }
table.grid tr:last-child td { border-bottom: none; }
.table-wrap { overflow-x: auto; }

.val { font-variant-numeric: tabular-nums; font-weight: 600; }
.val.invalid { color: var(--off); font-weight: 400; text-decoration: line-through; text-decoration-color: #c4cbd3; }
.val.none { color: var(--off); font-weight: 400; }

.btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 7px 14px; border-radius: 6px;
  border: 1px solid var(--line); background: var(--panel); color: var(--text); cursor: pointer;
}
.btn:hover { border-color: #c4cbd3; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); }
.btn.danger { color: var(--bad); }
.btn:disabled { opacity: .5; cursor: default; }

.field { display: flex; flex-direction: column; gap: 4px; margin-bottom: 12px; }
.field label { font-size: 12px; color: var(--muted); }
.field input, .field select, .field textarea {
  padding: 7px 10px; border: 1px solid var(--line); border-radius: 6px; background: #fff;
}
.field input:focus, .field select:focus { outline: 2px solid #bcd3fb; border-color: var(--primary); }

.alert { padding: 10px 14px; border-radius: 6px; margin-bottom: 12px; }
.alert.bad { background: var(--bad-bg); color: var(--bad); }
.alert.warn { background: var(--warn-bg); color: var(--warn); }
.alert.ok { background: var(--ok-bg); color: var(--ok); }

/* --- 登入 -------------------------------------------------------------- */
.login-wrap { min-height: 100%; display: flex; align-items: center; justify-content: center; padding: 20px; }
.login-box { width: 340px; }
.login-box h1 { font-size: 20px; margin: 0 0 4px; }
.login-box .btn { width: 100%; justify-content: center; margin-top: 4px; }

/* --- 總覽 -------------------------------------------------------------- */
.dev-meta { color: var(--muted); font-size: 12px; }
.flags { display: inline-flex; gap: 4px; flex-wrap: wrap; }
.err-line { color: var(--bad); font-size: 12px; padding: 8px 16px 0; }

/* --- 共用：工具列、分段按鈕、表單 ---------------------------------------- */
.spacer { flex: 1; }
.nowrap { white-space: nowrap; }
.mono { font-family: Consolas, "Courier New", monospace; }
.hint { color: var(--muted); font-size: 12px; margin-top: 2px; line-height: 1.5; }
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; margin-bottom: 12px; }
.toolbar select, .toolbar input[type=datetime-local] {
  padding: 6px 8px; border: 1px solid var(--line); border-radius: 6px; background: #fff;
}
.seg-group { display: inline-flex; flex-wrap: wrap; align-items: center; gap: 4px; }
.btn.seg { padding: 5px 10px; }
.btn.seg.on { background: #e8f0fe; border-color: var(--primary); color: var(--primary); }
.range-custom { display: inline-flex; align-items: center; gap: 6px; margin-left: 4px; }
.check { display: inline-flex; align-items: center; gap: 4px; cursor: pointer; user-select: none; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 0 16px; }
.sticky-actions { position: sticky; bottom: 0; background: var(--bg); padding: 10px 0; margin: 16px 0; z-index: 2; }
.card + .toolbar, .toolbar + .card, .alert + .card, div + .card { margin-top: 16px; }

/* --- 頻道選擇 ------------------------------------------------------------ */
.ch-details summary { cursor: pointer; color: var(--muted); margin: 4px 0 8px; }
.ch-picker { display: flex; flex-wrap: wrap; gap: 8px 24px; }
.ch-group-title { font-size: 12px; color: var(--muted); margin-bottom: 4px; }
.ch-item { display: inline-flex; align-items: center; gap: 4px; margin-right: 12px; cursor: pointer; }
.ch-item.deleted { color: var(--off); }

/* --- 趨勢圖 -------------------------------------------------------------- */
.chart-box { width: 100%; min-height: 200px; }
.chart-box .u-legend { font-size: 12px; }

/* --- 資料表 -------------------------------------------------------------- */
.pager { display: flex; align-items: center; gap: 12px; }
td.msg { white-space: pre-wrap; word-break: break-word; }

/* --- 對話框 -------------------------------------------------------------- */
.modal-wrap {
  position: fixed; inset: 0; background: #0006; z-index: 50;
  display: flex; align-items: flex-start; justify-content: center; padding: 30px 12px; overflow-y: auto;
}
.modal { width: min(1100px, 100%); }
.modal-body h3 { font-size: 14px; margin: 18px 0 8px; padding-bottom: 4px; border-bottom: 1px solid var(--line); }
.modal-body h3:first-of-type { margin-top: 4px; }
.modal-actions {
  display: flex; justify-content: flex-end; gap: 8px; padding: 12px 16px;
  border-top: 1px solid var(--line); position: sticky; bottom: 0; background: var(--panel);
}
.edit-grid td { padding: 4px 6px; }
.edit-grid input, .edit-grid select { padding: 5px 6px; border: 1px solid var(--line); border-radius: 4px; min-width: 0; }
.edit-grid input:not([type=checkbox]) { width: 120px; }
.edit-grid input.w-num { width: 64px; }
.edit-grid input.w-unit { width: 70px; }
.edit-grid input.w-dec { width: 52px; }
.edit-grid .btn { padding: 4px 8px; }

/* --- 通訊診斷 ------------------------------------------------------------ */
.diag-log { display: flex; flex-direction: column; gap: 8px; }
.diag-entry { padding: 8px 10px; border: 1px solid var(--line); border-radius: 6px; line-height: 1.7; word-break: break-all; }
.diag-entry.bad { border-color: #f3c2c2; background: var(--bad-bg); color: var(--bad); }
.edit-grid select { max-width: 150px; }

/* --- 告警、乾接點燈號 ---------------------------------------------------- */
.lamp { display: inline-block; width: 14px; height: 14px; border-radius: 50%; background: var(--off); flex: none; }
.lamp.ok { background: #2ea043; box-shadow: 0 0 0 3px var(--ok-bg); }
.lamp.bad { background: #e5383b; box-shadow: 0 0 0 3px var(--bad-bg); animation: blink 1s step-start infinite; }
.lamp.warn { background: #d4a72c; box-shadow: 0 0 0 3px var(--warn-bg); }
@keyframes blink { 50% { opacity: .35; } }
.alert-card { border-left: 4px solid var(--bad); }
.alert-list { list-style: none; margin: 0; padding: 4px 16px 12px; }
.alert-list li { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.alert-list li:last-child { border-bottom: 0; }
.alert-list .since { margin-left: auto; color: var(--muted); font-size: 12px; }
.di-list { padding: 8px 16px 14px; display: grid; gap: 10px; }
.di-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.di-row .di-state { font-weight: 700; font-size: 16px; }
.di-row .di-state.bad { color: var(--bad); }
.di-row .di-state.ok { color: var(--ok); }
.rules td { vertical-align: middle; }
.rules input.w-num { width: 80px; padding: 5px 6px; border: 1px solid var(--line); border-radius: 4px; margin: 0 4px; }