:root {
  --bg: #f2f7f4;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #0f766e;
  --primary-hover: #115e59;
  --border: #d1d5db;
  --on-color: #059669;
  --off-color: #6b7280;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  display: block;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: radial-gradient(circle at top right, #d1fae5, var(--bg));
  color: var(--text);
}

.dashboard {
  width: min(96vw, 1240px);
  margin: 24px auto;
  display: grid;
  grid-template-columns: minmax(320px, 460px) minmax(420px, 1fr);
  gap: 18px;
  align-items: start;
}

.card {
  width: 100%;
  background: var(--card);
  border-radius: 16px;
  padding: 28px 24px;
  box-shadow: 0 12px 30px rgba(15, 118, 110, 0.12);
  border: 1px solid rgba(15, 118, 110, 0.15);
}

.event-panel {
  min-height: 100%;
}

h1 {
  margin: 0 0 20px;
  font-size: 1.6rem;
}

/* Device list */
.device-list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.device-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #f9fafb;
}

.device-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.device-name {
  font-weight: 600;
  font-size: 1rem;
}

.device-status {
  font-size: 0.875rem;
  color: var(--muted);
}

.device-status.on {
  color: var(--on-color);
  font-weight: 600;
}

.device-status.off {
  color: var(--off-color);
}

.device-events {
  font-size: 0.8rem;
  color: #334155;
}

.actions {
  display: grid;
  gap: 10px;
}

.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
}

.chart-header h2 {
  margin: 0;
  font-size: 1rem;
}

.chart-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.range-label {
  font-size: 0.85rem;
  color: var(--muted);
}

.range-select {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  padding: 7px 8px;
  font-size: 0.85rem;
}

.chart-status {
  margin: 4px 0 10px;
  color: var(--muted);
  font-size: 0.85rem;
}

#refreshChartBtn {
  padding: 8px 10px;
  font-size: 0.85rem;
}

#eventChart {
  width: 100%;
  height: 360px;
  display: block;
  background: #ffffff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
}

.btn {
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  border-radius: 10px;
  padding: 11px 14px;
  font-size: 0.96rem;
  cursor: pointer;
}

.btn:hover {
  background: #f9fafb;
}

.btn.primary {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}

.btn.primary:hover {
  background: var(--primary-hover);
}

.btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.hint {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  word-break: break-all;
}

.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-card {
  width: min(90vw, 360px);
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.login-form label {
  font-size: 0.85rem;
  color: var(--muted);
  margin-top: 8px;
}

.login-form input {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 0.95rem;
}

.login-form button {
  margin-top: 16px;
}

.login-error {
  margin: 10px 0 0;
  color: #dc2626;
  font-size: 0.85rem;
}

.login-notice {
  margin: 10px 0 0;
  color: var(--on-color);
  font-size: 0.85rem;
}

.login-toggle {
  margin: 14px 0 0;
  text-align: center;
  font-size: 0.85rem;
}

.login-toggle a {
  color: var(--primary);
  text-decoration: none;
}

.login-toggle a:hover {
  text-decoration: underline;
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 12px;
  margin-bottom: 20px;
}

.topbar h1 {
  margin: 0;
}

.topbar-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.username-display {
  font-size: 0.85rem;
  color: var(--muted);
}

.r328-status {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 999px;
  white-space: nowrap;
}

.r328-status.online {
  color: var(--on-color);
  background: rgba(34, 197, 94, 0.12);
}

.r328-status.offline {
  color: var(--off-color);
  background: rgba(148, 163, 184, 0.15);
}

#logoutBtn {
  padding: 8px 12px;
  font-size: 0.85rem;
}

@media (max-width: 900px) {
  .dashboard {
    grid-template-columns: 1fr;
    gap: 14px;
    margin: 14px auto;
    width: min(96vw, 680px);
  }

  .card {
    padding: 20px 16px;
  }

  .chart-header {
    flex-direction: column;
    align-items: stretch;
  }

  .chart-controls {
    justify-content: space-between;
    flex-wrap: wrap;
  }

  #eventChart {
    height: 260px;
  }
}