:root {
  --bg: #0f172a;
  --card: #1e293b;
  --border: #334155;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --green: #22c55e;
  --red: #ef4444;
  --blue: #3b82f6;
  --orange: #f59e0b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}

h1 {
  margin: 0;
  font-size: 1.25rem;
}

.state-badge {
  padding: 0.4rem 0.9rem;
  border-radius: 9999px;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  background: var(--muted);
  color: white;
}
.state-badge.running { background: var(--green); }
.state-badge.success { background: var(--blue); }
.state-badge.connected,
.state-badge.stopped { background: var(--red); }
.state-badge.config_wifi { background: var(--orange); }

main {
  max-width: 980px;
  margin: 1.5rem auto;
  padding: 0 1rem;
  display: grid;
  gap: 1rem;
}

.card {
  background: var(--card);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--border);
}

.card h2 {
  margin: 0 0 1rem 0;
  font-size: 1rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.progress {
  height: 8px;
  background: #334155;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 1rem;
}
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--green));
  width: 0%;
  transition: width 0.4s ease;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.6rem 1.5rem;
}
.metric-grid > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--border);
}
.label { color: var(--muted); font-size: 0.875rem; }
.value { font-size: 1.15rem; font-weight: 600; }

.muted { color: var(--muted); font-size: 0.825rem; }

.button-row {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

button {
  padding: 0.6rem 1.25rem;
  border-radius: 8px;
  border: none;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  background: var(--muted);
  color: white;
  transition: opacity 0.15s, transform 0.05s;
}
button:hover { opacity: 0.85; }
button:active { transform: translateY(1px); }
.btn-primary { background: var(--green); }
.btn-danger { background: var(--red); }
.btn-secondary { background: var(--accent); color: #052e3e; }

.form-row {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}
.form-row label {
  color: var(--muted);
  font-size: 0.875rem;
  min-width: 200px;
}
.form-row input {
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  width: 120px;
  font-size: 1rem;
}
.form-row input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.chart-card .chart-wrap {
  position: relative;
  height: 260px;
}

footer {
  text-align: center;
  padding: 1.5rem 1rem;
  color: var(--muted);
}

@media (max-width: 600px) {
  header { padding: 1rem; }
  h1 { font-size: 1.1rem; }
  .card { padding: 1rem; }
  .form-row label { min-width: 100%; }
}