:root {
  --sidebar-bg: #0c1220;
  --sidebar-bg-2: #121a2e;
  --sidebar-border: rgba(255,255,255,.08);
  --sidebar-text: #93a0bd;
  --sidebar-text-active: #ffffff;

  --bg: #f3f5fa;
  --panel: #ffffff;
  --border: #e6e9f2;
  --text: #12172b;
  --muted: #6b7488;

  --accent: #3b6df0;
  --accent-hover: #2c5adb;
  --success: #16a34a;
  --success-bg: #e8f8ee;
  --danger: #e0396b;
  --warn: #b45309;
  --warn-bg: #fef3d9;

  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --shadow: 0 1px 2px rgba(15,23,42,.04), 0 2px 8px rgba(15,23,42,.05);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: var(--sans);
  margin: 0;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

/* ---------- layout shell ---------- */
.shell { display: flex; min-height: 100vh; }

.sidebar {
  width: 232px;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  padding: 22px 14px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.sidebar .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 10px 24px;
  font-weight: 700;
  font-size: 15px;
  color: #fff;
  letter-spacing: .2px;
}
.sidebar .brand .dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(59,109,240,.25);
}
.navlink {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px;
  border-radius: 8px;
  color: var(--sidebar-text);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  border-left: 3px solid transparent;
  background: none;
  text-align: left;
  width: 100%;
  transition: background .12s, color .12s;
}
.navlink:hover { color: #d7ddef; background: rgba(255,255,255,.04); }
.navlink.active {
  color: var(--sidebar-text-active);
  background: var(--sidebar-bg-2);
  border-left: 3px solid var(--accent);
  padding-left: 9px;
}
.sidebar .spacer { flex: 1; }
.sidebar .logout {
  color: #f0567f;
  font-size: 13px;
  font-weight: 600;
  background: none;
  border: none;
  padding: 10px 12px;
  cursor: pointer;
  text-align: left;
  border-top: 1px solid var(--sidebar-border);
  margin-top: 8px;
  padding-top: 16px;
}

.main { flex: 1; min-width: 0; padding: 28px 34px 60px; max-width: 1040px; }

/* ---------- top stat tiles ---------- */
.stats-row { display: flex; gap: 16px; margin-bottom: 22px; flex-wrap: wrap; }
.stat-tile {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 16px 20px;
  min-width: 180px;
  flex: 1;
}
.stat-tile .label { font-size: 12px; color: var(--muted); font-weight: 600; }
.stat-tile .value { font-family: var(--mono); font-size: 24px; font-weight: 700; margin-top: 6px; color: var(--text); }
.stat-tile.on .value { color: var(--success); }
.stat-tile.off .value { color: var(--warn); }

/* ---------- panels ---------- */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 22px 24px;
  margin-bottom: 18px;
}
.panel[hidden] { display: none; }
.panel h2 {
  margin: 0 0 4px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--text);
}
.panel .hint { color: var(--muted); font-size: 12.5px; margin: 0 0 16px; }

.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 14px; }
label { display: flex; flex-direction: column; gap: 6px; font-size: 12.5px; color: var(--muted); font-weight: 600; }

input, textarea {
  padding: 9px 11px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13.5px;
  font-family: var(--mono);
  background: #fbfcfe;
  color: var(--text);
}
input::placeholder, textarea::placeholder { color: #a7afc2; }
input:focus, textarea:focus { outline: none; border-color: var(--accent); background: #fff; }
textarea { font-family: var(--sans); }

.checkbox { flex-direction: row; align-items: center; gap: 8px; }
.checkbox input { width: auto; accent-color: var(--accent); }

button {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 9px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 600;
  margin-right: 8px;
  margin-bottom: 6px;
}
button:hover { background: var(--accent-hover); }
button.secondary { background: #eef1f8; border: 1px solid var(--border); color: var(--text); }
button.secondary:hover { background: #e4e8f3; }

table { width: 100%; border-collapse: collapse; margin-top: 12px; }
th, td { text-align: left; padding: 10px 10px; border-bottom: 1px solid var(--border); font-size: 13px; }
th { color: var(--muted); font-weight: 600; font-size: 11.5px; }
td { font-family: var(--mono); color: var(--text); }
td:first-child, th:first-child { padding-left: 0; }
tbody tr:hover { background: #f8f9fd; }

.ok { color: var(--success); margin-left: 10px; font-size: 13px; font-weight: 600; }
#logList { list-style: none; padding: 0; margin: 0; max-height: 340px; overflow-y: auto; font-size: 12.5px; font-family: var(--mono); }
#logList li { padding: 9px 0; border-bottom: 1px solid var(--border); color: var(--muted); }

/* ---------- login ---------- */
.login-body {
  display: flex; align-items: center; justify-content: center;
  height: 100vh;
  background: var(--sidebar-bg);
}
.login-card {
  background: var(--panel);
  border: 1px solid var(--border);
  padding: 34px 32px;
  border-radius: 14px;
  box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 12px;
  width: 300px;
}
.login-card h1 { margin: 0 0 6px; font-size: 17px; font-weight: 700; color: var(--text); }
.login-card .sub { color: var(--muted); font-size: 12.5px; margin: -8px 0 6px; }
.error { color: var(--danger); font-size: 13px; min-height: 16px; }