:root {
  --bg-primary: #0a0e17;
  --bg-card: #111827;
  --bg-card-hover: #1a2332;
  --bg-input: #1e293b;
  --border: #1e3a5f;
  --border-active: #f97316;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #f97316;
  --accent-glow: rgba(249, 115, 22, 0.3);
  --success: #22c55e;
  --success-bg: rgba(34, 197, 94, 0.1);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.1);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.1);
  --radius: 12px;
  --radius-sm: 8px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(249,115,22,0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(239,68,68,0.06) 0%, transparent 50%),
    linear-gradient(180deg, rgba(249,115,22,0.02) 0%, transparent 40%);
  pointer-events: none;
  z-index: 0;
}

.app {
  position: relative;
  z-index: 1;
  max-width: 540px;
  margin: 0 auto;
  padding: 16px;
  padding-bottom: 80px;
}

/* Header */
.header {
  text-align: center;
  padding: 24px 0 20px;
}

.header-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: linear-gradient(135deg, #f97316, #ef4444);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  box-shadow: 0 8px 32px rgba(249,115,22,0.3);
}

.header-icon svg {
  width: 28px;
  height: 28px;
  fill: white;
}

.header h1 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #f97316, #ef4444);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header p {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Status bar */
.status-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  overflow-x: auto;
  scrollbar-width: none;
  padding: 2px;
}

.status-bar::-webkit-scrollbar { display: none; }

.status-chip {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.status-chip .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 6px var(--success);
}

.status-chip .dot.warn { background: var(--warning); box-shadow: 0 0 6px var(--warning); }
.status-chip .dot.off { background: var(--text-muted); box-shadow: none; }

/* Section */
.section { margin-bottom: 16px; }

.section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-muted);
  padding: 0 4px;
  margin-bottom: 8px;
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 8px;
  padding: 12px 16px;
  transition: border-color 0.2s;
}

.card:hover { border-color: rgba(249,115,22,0.3); }

.card-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  gap: 8px;
  flex-wrap: wrap;
}

.card-row + .card-row { border-top: 1px solid var(--border); }

.card-row-info { flex: 1; min-width: 0; }
.card-row-label { font-size: 14px; font-weight: 500; color: var(--text-primary); }
.card-row-desc { font-size: 12px; color: var(--text-muted); margin-top: 2px; }

/* Toggle switch */
.toggle {
  position: relative;
  width: 44px;
  height: 26px;
  flex-shrink: 0;
  margin-left: 12px;
}

.toggle input { opacity: 0; width: 0; height: 0; }

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--bg-input);
  border-radius: 13px;
  cursor: pointer;
  transition: all 0.3s;
  border: 1px solid var(--border);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  left: 2px;
  bottom: 2px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: all 0.3s;
}

.toggle input:checked + .toggle-slider {
  background: var(--accent);
  border-color: var(--accent);
}

.toggle input:checked + .toggle-slider::before {
  transform: translateX(18px);
  background: white;
}

/* Info grid */
.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.info-cell {
  background: var(--bg-card);
  padding: 12px 14px;
}

.info-label {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.info-value {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 4px;
  word-break: break-all;
}

/* Buttons */
.btn {
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
  display: inline-block;
  margin: 4px;
}

.btn:hover { border-color: var(--accent); background: var(--bg-card-hover); }
.btn-danger { border-color: rgba(239,68,68,0.3); color: var(--danger); }
.btn-danger:hover { background: var(--danger-bg); border-color: var(--danger); }
.btn-secondary { border-color: rgba(139,92,246,0.3); color: #8b5cf6; }
.btn-secondary:hover { background: rgba(139,92,246,0.1); border-color: #8b5cf6; }
.btn-small { padding: 6px 12px; font-size: 12px; }

/* Input fields */
.input-text {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
  transition: border-color 0.2s;
  width: auto;
  min-width: 80px;
}

.input-text:focus { border-color: var(--accent); }

.input-select {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  color: var(--text-primary);
  font-size: 13px;
  outline: none;
}

/* Log output */
.log-output {
  background: #030712;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  max-height: 300px;
  overflow-y: auto;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 11px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-top: 8px;
  white-space: pre-wrap;
  word-break: break-all;
}

.mono {
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 12px;
  color: var(--accent);
}

/* GPIO grid */
.gpio-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 6px;
}

.gpio-pin {
  padding: 8px 4px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-input);
  text-align: center;
  font-size: 10px;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.2s;
}

.gpio-pin.active { border-color: var(--accent); color: var(--accent); background: rgba(249,115,22,0.1); }
.gpio-pin.high { border-color: var(--success); color: var(--success); background: var(--success-bg); }
.gpio-pin.low { border-color: var(--danger); color: var(--danger); background: var(--danger-bg); }

.gpio-pin .pin-name { font-weight: 600; font-size: 11px; }
.gpio-pin .pin-val { font-size: 9px; margin-top: 2px; }

/* Toast */
.toast {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-size: 13px;
  font-weight: 500;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 100;
  white-space: nowrap;
}

.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }
.toast.success { border-color: var(--success); }
.toast.error { border-color: var(--danger); }

/* Tab bar */
.tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(10,14,23,0.95);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: center;
  gap: 4px;
  padding: 8px 16px;
  padding-bottom: max(8px, env(safe-area-inset-bottom));
  z-index: 50;
}

.tab-item {
  flex: 1;
  max-width: 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 6px 4px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 10px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  background: none;
}

.tab-item:hover { color: var(--text-secondary); }
.tab-item.active { color: var(--accent); }
.tab-item svg { width: 20px; height: 20px; fill: currentColor; }

/* Pages */
.page { display: none; }
.page.active { display: block; }

label {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
}

@media (max-width: 380px) {
  .info-grid { grid-template-columns: 1fr; }
  .gpio-grid { grid-template-columns: repeat(3, 1fr); }
}