:root {
  --primary-color: #0066cc;
  --danger-color: #cc0000;
  --success-color: #00cc00;
  --background-color: #f9f9f9;
  --text-color: #333;
  --border-color: #ddd;
  --shadow-color: rgba(0, 0, 0, 0.1);
}

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

body {
  font-family: Arial, sans-serif;
  margin: 0; padding: 20px;
  color: var(--text-color);
  background-color: #f0f0f0;
  line-height: 1.6;
}

h1 { color: var(--primary-color); margin-bottom: 20px; text-align: center; }
h2 { color: var(--primary-color); margin-bottom: 15px; font-size: 1.5rem; }
h3 { margin-bottom: 10px; color: var(--primary-color); font-size: 1.1rem; }

.container { max-width: 800px; margin: 0 auto; }

.card {
  background: var(--background-color);
  border-radius: 8px; padding: 20px; margin-bottom: 20px;
  box-shadow: 0 2px 4px var(--shadow-color);
}

.btn {
  background: var(--primary-color); color: white; border: none;
  padding: 10px 15px; border-radius: 4px; cursor: pointer;
  font-size: 1rem; transition: background-color 0.3s;
}
.btn:hover { opacity: 0.9; }
.btn-danger { background: var(--danger-color); }
.btn-small { padding: 6px 12px; font-size: 0.85rem; }
.btn-secondary { background-color: #6c757d; }

/* Device header */
.device-header {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 15px; padding-bottom: 10px; border-bottom: 2px solid var(--primary-color);
}

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

.device-status {
  padding: 4px 12px; border-radius: 12px; font-size: 0.85rem; font-weight: bold;
}
.device-status.online { background-color: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.device-status.offline { background-color: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }

/* Relay rows */
.relay-row {
  padding: 12px 0; border-bottom: 1px solid var(--border-color);
}
.relay-row:last-child { border-bottom: none; }

.relay-header {
  display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px;
}

.button-group {
  display: flex; flex-direction: row !important; gap: 20px;
  margin-top: 8px; justify-content: center;
}

.img-btn {
  display: flex; flex-direction: column; align-items: center;
  background: none; border: none; cursor: pointer; padding: 10px;
  transition: transform 0.2s; width: 100px;
}
.img-btn:hover { transform: scale(1.05); }
.img-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.img-btn:disabled:hover { transform: none; }
.img-btn.active .power-on { background-color: #c8e6c9; box-shadow: 0 0 8px var(--success-color); }
.img-btn.active .power-off { background-color: #ffcdd2; box-shadow: 0 0 8px var(--danger-color); }
.img-btn span { margin-top: 8px; font-weight: bold; }

.btn-img {
  width: 50px; height: 50px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center; position: relative;
}

.power-on { background-color: #e8f5e9; border: 2px solid var(--success-color); }
.power-on:before {
  content: ''; position: absolute; width: 20px; height: 20px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%2300cc00'%3E%3Cpath d='M13 3h-2v10h2V3zm4.83 2.17l-1.42 1.42C17.99 7.86 19 9.81 19 12c0 3.87-3.13 7-7 7s-7-3.13-7-7c0-2.19 1.01-4.14 2.58-5.42L6.17 5.17C4.23 6.82 3 9.26 3 12c0 4.97 4.03 9 9 9s9-4.03 9-9c0-2.74-1.23-5.18-3.17-6.83z'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: center;
}

.power-off { background-color: #ffebee; border: 2px solid var(--danger-color); }
.power-off:before {
  content: ''; position: absolute; width: 20px; height: 20px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23cc0000'%3E%3Cpath d='M13 3h-2v10h2V3zm4.83 2.17l-1.42 1.42C17.99 7.86 19 9.81 19 12c0 3.87-3.13 7-7 7s-7-3.13-7-7c0-2.19 1.01-4.14 2.58-5.42L6.17 5.17C4.23 6.82 3 9.26 3 12c0 4.97 4.03 9 9 9s9-4.03 9-9c0-2.74-1.23-5.18-3.17-6.83z'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: center;
}

/* LED */
.led-container { display: flex; align-items: center; }
.led {
  display: inline-block; width: 20px; height: 20px; border-radius: 50%;
  margin-right: 10px; background-color: #333;
  box-shadow: 0 0 5px rgba(0,0,0,0.3); position: relative;
}
.led:before {
  content: ''; position: absolute; top: 4px; left: 6px;
  width: 6px; height: 6px; border-radius: 50%;
  background-color: rgba(255,255,255,0.4);
}
.led.on {
  background-color: var(--success-color);
  box-shadow: 0 0 10px var(--success-color), 0 0 20px var(--success-color);
}
.led.off { background-color: #666; }

/* Status banners */
.status-banner { border-left: 4px solid var(--border-color); padding: 15px; }
.status-banner.connected { background-color: #d4edda; border-left-color: var(--success-color); }
.status-banner.disconnected { background-color: #f8d7da; border-left-color: var(--danger-color); }
.status-banner.connecting { background-color: #fff3cd; border-left-color: #ffc107; }

.status-content { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.status-icon {
  width: 36px; height: 36px; border-radius: 50%; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  color: white; font-size: 20px; font-weight: bold;
}
.connected .status-icon { background-color: var(--success-color); box-shadow: 0 0 10px var(--success-color); }
.disconnected .status-icon { background-color: var(--danger-color); }
.connecting .status-icon { background-color: #ffc107; animation: pulse 1.5s ease-in-out infinite; }

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

.status-text { flex: 1; min-width: 150px; }
.status-text strong { display: block; font-size: 1rem; }
.status-text span { font-size: 0.85rem; color: #666; }
.status-actions { display: flex; gap: 8px; }

/* Forms */
.form-group { margin-bottom: 15px; }
label { display: block; margin-bottom: 5px; font-weight: bold; }
input[type='text'], input[type='password'], input[type='number'], select {
  width: 100%; padding: 8px; border-radius: 4px;
  border: 1px solid var(--border-color); font-size: 1rem;
}
.help-text { display: block; font-size: 0.85rem; margin-top: 4px; color: #666; }

/* Modal */
.modal-overlay {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  background-color: rgba(0,0,0,0.5); display: flex;
  align-items: center; justify-content: center; z-index: 1000;
}
.modal-content {
  background: white; border-radius: 8px; max-width: 480px; width: 90%;
  max-height: 90vh; overflow-y: auto; box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.modal-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 20px; border-bottom: 1px solid var(--border-color);
}
.modal-header h2 { margin: 0; font-size: 1.3rem; }
.modal-close {
  background: none; border: none; font-size: 1.8rem; cursor: pointer;
  color: #999; line-height: 1; padding: 0;
}
.modal-close:hover { color: #333; }
.modal-body { padding: 20px; }
.modal-footer {
  padding: 15px 20px; border-top: 1px solid var(--border-color);
  display: flex; justify-content: flex-end; gap: 10px;
}

/* Info grid */
.info-grid { display: grid; grid-template-columns: auto 1fr; gap: 8px 15px; font-size: 0.95rem; }
.info-grid .info-label { font-weight: bold; color: #555; }

/* Responsive */
@media (max-width: 600px) {
  body { padding: 10px; }
  .status-content { flex-direction: column; align-items: flex-start; }
  .status-actions { width: 100%; }
  .status-actions .btn-small { flex: 1; }
  .button-group { flex-direction: column; align-items: center; }
  .device-header { flex-direction: column; align-items: flex-start; gap: 8px; }
}