:root {
  --bg: #071015;
  --panel: rgba(18, 34, 41, 0.92);
  --panel-strong: rgba(21, 44, 52, 0.98);
  --line: rgba(137, 174, 183, 0.24);
  --text: #eef7f5;
  --muted: #9fb6b7;
  --cyan: #4bd4d2;
  --green: #50d890;
  --amber: #e9c46a;
  --red: #ff6b6b;
  --blue: #78a6ff;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  font-family: "Aptos Display", "Microsoft YaHei UI", "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(75, 212, 210, 0.18), transparent 34rem),
    linear-gradient(135deg, #061014 0%, #0f2228 46%, #111b1f 100%);
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.88), rgba(0, 0, 0, 0.2));
}

.shell {
  width: min(1760px, calc(100vw - 40px));
  margin: 0 auto;
  padding: 28px 0 34px;
}

.topbar,
.summary,
.layout {
  display: grid;
  gap: 18px;
}

.topbar {
  grid-template-columns: 1fr auto;
  align-items: end;
  margin-bottom: 20px;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 32px;
  font-weight: 760;
}

h2 {
  font-size: 18px;
  font-weight: 700;
}

.clock {
  min-width: 220px;
  padding: 14px 18px;
  text-align: right;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.clock span {
  display: block;
  font-size: 24px;
  font-weight: 760;
}

.clock small {
  color: var(--muted);
}

.summary {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-bottom: 18px;
}

.summary-item {
  min-height: 116px;
  padding: 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--cyan);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.summary-item span {
  display: block;
  color: var(--muted);
  font-size: 14px;
}

.summary-item strong {
  display: block;
  margin-top: 12px;
  font-size: 44px;
  line-height: 1;
}

.summary-item.online {
  border-left-color: var(--green);
}

.summary-item.offline {
  border-left-color: var(--red);
}

.summary-item.active {
  border-left-color: var(--blue);
}

.summary-item.stale {
  border-left-color: var(--amber);
}

.layout {
  grid-template-columns: minmax(420px, 0.86fr) minmax(520px, 1.14fr);
  align-items: start;
}

.device-list,
.detail {
  min-height: 520px;
  padding: 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.section-head span {
  color: var(--muted);
  font-size: 13px;
}

.device-grid {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.device-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  width: 100%;
  padding: 14px;
  color: inherit;
  text-align: left;
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
}

.device-card:hover,
.device-card.selected {
  border-color: rgba(75, 212, 210, 0.7);
  background: rgba(75, 212, 210, 0.09);
}

.device-name {
  overflow: hidden;
  font-size: 16px;
  font-weight: 720;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.device-meta {
  margin-top: 7px;
  color: var(--muted);
  font-size: 13px;
}

.badges {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.badge {
  display: inline-flex;
  min-width: 56px;
  justify-content: center;
  padding: 5px 8px;
  color: #041015;
  font-size: 12px;
  font-weight: 760;
  border-radius: 999px;
}

.badge.online,
.badge.active {
  background: var(--green);
}

.badge.offline {
  background: var(--red);
}

.badge.waiting,
.badge.stale {
  background: var(--amber);
}

.detail-body {
  padding-top: 16px;
}

.detail-body.empty {
  display: grid;
  min-height: 420px;
  place-items: center;
  color: var(--muted);
  border: 1px dashed var(--line);
  border-radius: 8px;
}

.metric-group {
  margin-bottom: 18px;
}

.metric-group h3 {
  margin: 0 0 10px;
  color: var(--cyan);
  font-size: 14px;
  font-weight: 720;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(118px, 1fr));
  gap: 10px;
}

.metric {
  min-height: 74px;
  padding: 12px;
  background: rgba(255, 255, 255, 0.055);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.metric label {
  display: block;
  min-height: 18px;
  color: var(--muted);
  font-size: 12px;
}

.metric strong {
  display: block;
  margin-top: 7px;
  overflow-wrap: anywhere;
  font-size: 20px;
  line-height: 1.2;
}

.timeline {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 18px;
}

.timebox {
  padding: 12px;
  background: var(--panel-strong);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.timebox span {
  display: block;
  color: var(--muted);
  font-size: 12px;
}

.timebox strong {
  display: block;
  margin-top: 6px;
  font-size: 14px;
}

@media (max-width: 1180px) {
  .summary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .shell {
    width: min(100vw - 24px, 1760px);
    padding-top: 18px;
  }

  .topbar {
    grid-template-columns: 1fr;
  }

  .clock {
    width: 100%;
    text-align: left;
  }

  .summary,
  .metric-grid,
  .timeline {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 26px;
  }
}