@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
  --bg-base: #09090b;
  --bg-card: rgba(24, 24, 27, 0.6);
  --bg-card-hover: rgba(39, 39, 42, 0.6);
  --border-card: rgba(255, 255, 255, 0.08);
  --border-card-hover: rgba(255, 255, 255, 0.15);
  
  --text-primary: #fafafa;
  --text-secondary: #a1a1aa;
  --text-muted: #52525b;

  --accent-glow: rgba(59, 130, 246, 0.5);
  --color-success: #10b981;
  --color-error: #ef4444;

  --gradient-pleasant: linear-gradient(135deg, #34d399 0%, #10b981 100%);
  --gradient-hot: linear-gradient(135deg, #fb923c 0%, #ef4444 100%);
  --gradient-cold: linear-gradient(135deg, #38bdf8 0%, #3b82f6 100%);
  --gradient-offline: linear-gradient(135deg, #a1a1aa 0%, #52525b 100%);
}

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

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-base);
  color: var(--text-primary);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 15% 50%, rgba(59, 130, 246, 0.08), transparent 25%),
    radial-gradient(circle at 85% 30%, rgba(139, 92, 246, 0.08), transparent 25%);
  background-attachment: fixed;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.status-indicator {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 6px 12px;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border-radius: 20px;
  border: 1px solid var(--border-card);
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background-color: var(--color-error);
  box-shadow: 0 0 8px var(--color-error);
  transition: all 0.3s ease;
}

.status-dot.connected {
  background-color: var(--color-success);
  box-shadow: 0 0 10px var(--color-success);
}

/* =========================================
   Devices Grid
   ========================================= */
.devices-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 24px;
}

/* =========================================
   Device Card (Neo-Glassmorphism)
   ========================================= */
.device-card {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-card);
  border-radius: 24px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.3s ease;
  box-shadow: 0 10px 30px -10px rgba(0,0,0,0.5);
  position: relative;
  overflow: hidden;
}

.device-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-card-hover);
}

/* Glow top edge */
.device-card::before {
  content: '';
  position: absolute;
  top: 0; left: 10%; right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  opacity: 0.5;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.device-id-container {
  display: flex;
  align-items: center;
  gap: 8px;
}

.device-id {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.fw-badge {
  font-size: 0.6rem;
  font-weight: 700;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.05);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border-card);
}

.device-status {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 10px;
  border-radius: 20px;
  background: rgba(16, 185, 129, 0.1);
  color: var(--color-success);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

/* =========================================
   Hero Temperature
   ========================================= */
.temp-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem 0;
}

.temp-main {
  font-size: 4.5rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.04em;
  color: transparent;
  background-clip: text;
  -webkit-background-clip: text;
  /* Default Gradient Fallback */
  background-image: var(--gradient-pleasant);
  transition: all 0.5s ease;
}

.temp-main.cold { background-image: var(--gradient-cold); }
.temp-main.hot { background-image: var(--gradient-hot); }
.temp-main.pleasant { background-image: var(--gradient-pleasant); }
.temp-main.offline-color { background-image: var(--gradient-offline); }

.temp-unit {
  font-size: 1.5rem;
  font-weight: 500;
  margin-left: 4px;
  color: var(--text-secondary);
}

/* =========================================
   Metrics Grid (Pills)
   ========================================= */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.metric-pill {
  background: rgba(0,0,0,0.2);
  border: 1px solid var(--border-card);
  border-radius: 12px;
  padding: 10px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.metric-pill svg {
  color: var(--text-secondary);
  opacity: 0.8;
}

.metric-value {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
}

.metric-label {
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.last-update {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
  margin-top: -8px;
  margin-bottom: 0.5rem;
}

/* =========================================
   System Metrics
   ========================================= */
.system-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: 4px;
}

.sys-pill {
  display: flex;
  flex-direction: column;
  padding: 4px 0;
  border-top: 1px solid var(--border-card);
}

.sys-label {
  font-size: 0.6rem;
  color: var(--text-muted);
  text-transform: uppercase;
}

.sys-value {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-secondary);
}

/* =========================================
   Controls / Actions
   ========================================= */
.card-controls {
  display: flex;
  gap: 8px;
  border-top: 1px solid var(--border-card);
  padding-top: 1.5rem;
}

.btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 0.8rem;
  border-radius: 12px;
  border: 1px solid var(--border-card);
  background: rgba(255,255,255,0.03);
  color: var(--text-secondary);
  font-family: inherit;
  font-weight: 500;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.btn:hover:not(:disabled) {
  background: rgba(255,255,255,0.08);
  color: var(--text-primary);
  border-color: rgba(255,255,255,0.2);
}

.btn:active:not(:disabled) {
  transform: scale(0.97);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: rgba(59, 130, 246, 0.1);
  color: #60a5fa;
  border-color: rgba(59, 130, 246, 0.2);
}

.btn-primary:hover:not(:disabled) {
  background: rgba(59, 130, 246, 0.2);
  color: #93c5fd;
  border-color: rgba(59, 130, 246, 0.4);
  box-shadow: 0 0 15px rgba(59, 130, 246, 0.15);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.03);
}

/* =========================================
   OTA Upload Area
   ========================================= */
.ota-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.file-upload-label {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem;
  background: rgba(0,0,0,0.2);
  border: 1px dashed var(--text-muted);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.file-upload-label:hover {
  border-color: var(--text-primary);
  color: var(--text-primary);
  background: rgba(255,255,255,0.05);
}

.file-input {
  display: none;
}

.progress-bar-container {
  width: 100%;
  height: 4px;
  background: rgba(0, 0, 0, 0.4);
  border-radius: 2px;
  overflow: hidden;
  margin-top: 4px;
}
.progress-bar {
  height: 100%;
  background: var(--text-primary);
  transition: width 0.3s ease;
}

.ota-status-text {
  font-size: 0.75rem;
  text-align: center;
  color: var(--text-muted);
}

/* =========================================
   Offline State
   ========================================= */
.device-card.offline {
  opacity: 0.6;
  filter: grayscale(80%);
  border-color: rgba(239, 68, 68, 0.2);
}
.device-status.offline {
  background: rgba(239, 68, 68, 0.1);
  color: var(--color-error);
  border-color: rgba(239, 68, 68, 0.2);
}

/* =========================================
   Responsive
   ========================================= */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }
  .devices-grid {
    grid-template-columns: 1fr;
  }
  .glass-header {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
    border-radius: 16px;
    padding: 1.25rem;
  }
}