:root {
  --bg: #0f1420;
  --card-bg: #1a2130;
  --card-border: #2a3346;
  --text: #e4e8f1;
  --text-dim: #8b93a7;
  --green: #3ecf6e;
  --gray: #5a6478;
  --red: #e5534b;
  --yellow: #e5c53b;
  --accent: #4f8ef7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--card-border);
}

.topbar h1 {
  font-size: 20px;
  margin: 0;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--text-dim);
}

button {
  background: var(--card-bg);
  color: var(--text);
  border: 1px solid var(--card-border);
  border-radius: 6px;
  padding: 6px 14px;
  cursor: pointer;
  font-size: 13px;
}

button:hover {
  border-color: var(--accent);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
  padding: 24px;
}

.empty-hint {
  grid-column: 1 / -1;
  color: var(--text-dim);
  text-align: center;
  padding: 40px;
}

.server-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card-header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gray);
  flex-shrink: 0;
}

.status-dot.online {
  background: var(--green);
  box-shadow: 0 0 6px var(--green);
}

.status-dot.offline {
  background: var(--gray);
}

.card-title {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.server-name {
  font-size: 16px;
  margin: 0;
}

.server-label {
  font-size: 12px;
  color: var(--text-dim);
}

.card-uptime {
  font-size: 12px;
  color: var(--text-dim);
  white-space: nowrap;
}

.metric-row {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.metric-label {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-dim);
}

.metric-value {
  color: var(--text);
  font-variant-numeric: tabular-nums;
}

.progress-bar {
  width: 100%;
  height: 6px;
  background: #0d1220;
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.4s ease;
}

.progress-fill.warn {
  background: var(--yellow);
}

.progress-fill.danger {
  background: var(--red);
}

.net-row {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}

.chart-wrap {
  margin-top: 4px;
}

/* Login page */
.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.login-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 32px;
  width: 320px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.login-card h1 {
  font-size: 18px;
  margin: 0;
  text-align: center;
}

.login-sub {
  margin: 0 0 6px;
  font-size: 13px;
  color: var(--text-dim);
  text-align: center;
}

.login-card label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 13px;
  color: var(--text-dim);
}

.login-card input {
  background: #0d1220;
  border: 1px solid var(--card-border);
  border-radius: 6px;
  padding: 8px 10px;
  color: var(--text);
  font-size: 14px;
}

.login-card button {
  margin-top: 6px;
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  padding: 9px;
  font-size: 14px;
}

.login-error {
  color: var(--red);
  font-size: 13px;
  text-align: center;
  margin: 0;
}