:root {
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --text-color: #0f172a;
  --text-secondary: #64748b;
  --primary-color: #4f46e5;
  --border-color: #e2e8f0;
  
  /* Colores modernizados */
  --temperature-color: #ff6b6b;
  --pressure-color: #4ecdc4;
  --humidity-color: #45b7d1;
  --altitude-color: #96ceb4;
  --battery-color: #ffd93d;
  
  /* Gradientes épicos */
  --temperature-gradient: linear-gradient(135deg, #ff6b6b, #ff8e8e);
  --pressure-gradient: linear-gradient(135deg, #4ecdc4, #67e6dc);
  --humidity-gradient: linear-gradient(135deg, #45b7d1, #6bc5e8);
  --altitude-gradient: linear-gradient(135deg, #96ceb4, #b4e0c8);
  --battery-gradient: linear-gradient(135deg, #ffd93d, #ffeaa7);
  
  /* Sombras modernas */
  --shadow-soft: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 15px 35px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 20px rgba(79, 70, 229, 0.08);
}

html.dark {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-color: #f1f5f9;
  --text-secondary: #94a3b8;
  --primary-color: #818cf8;
  --border-color: #334155;
  --shadow-soft: 0 8px 30px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 15px 35px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 25px rgba(129, 140, 248, 0.12);
}

/* ---------------- CONTENEDOR GENERAL ---------------- */
.sensor-dashboard {
  background: transparent;
  color: var(--text-color);
  padding: 1.5rem 0 2rem;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ------------ PILL "ULTIMA LECTURA" CON TRANSICIÓN LENTA ------------ */
.dashboard-header {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.6rem 1.2rem;
  border-radius: 50px;
  background: linear-gradient(135deg, 
              rgba(79, 70, 229, 0.12) 0%, 
              rgba(99, 102, 241, 0.08) 100%);
  backdrop-filter: blur(20px);
  border: 1px solid rgba(79, 70, 229, 0.2);
  box-shadow: 
    0 8px 25px rgba(79, 70, 229, 0.15),
    inset 0 1px 0 rgba(255, 255, 255, 0.7);
  max-width: 380px;
  position: relative;
  overflow: hidden;
  transition: all 0.5s ease;
}

.dashboard-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, 
              transparent, 
              rgba(255, 255, 255, 0.4), 
              transparent);
  transition: left 0.8s ease;
}

.dashboard-header:hover {
  transform: translateY(-1px);
  box-shadow: 
    0 12px 30px rgba(79, 70, 229, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
  border-color: rgba(79, 70, 229, 0.3);
}

.dashboard-header:hover::before {
  left: 100%;
}

html.dark .dashboard-header {
  background: linear-gradient(135deg, 
              rgba(129, 140, 248, 0.15) 0%, 
              rgba(99, 102, 241, 0.1) 100%);
  border: 1px solid rgba(129, 140, 248, 0.3);
  box-shadow: 
    0 8px 25px rgba(0, 0, 0, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.dashboard-header i {
  font-size: 1.3rem;
  background: linear-gradient(135deg, var(--primary-color), #6366f1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 4px rgba(79, 70, 229, 0.3));
}

.dashboard-header .last-reading {
  font-weight: 600;
  color: var(--text-color);
  white-space: nowrap;
  font-size: 0.95rem;
}

.dashboard-header .reading-time {
  margin-left: 0.3rem;
  background: linear-gradient(135deg, var(--primary-color), #6366f1);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 700;
  font-size: 0.95rem;
}

/* ---------------- GRID DE CARDS (MANTENIENDO 4 COLUMNAS) ---------------- */
.sensor-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.5rem;
}

/* ---------------- CARDS CON BORDER RADIUS CORREGIDO ---------------- */
.sensor-card {
  position: relative;
  background: linear-gradient(145deg, 
              var(--card-bg) 0%, 
              rgba(255, 255, 255, 0.95) 100%);
  border-radius: 16px;
  padding: 1.6rem 1.2rem 1.4rem;
  border: 1px solid rgba(255, 255, 255, 0.8);
  box-shadow: 
    var(--shadow-soft),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  overflow: hidden;
  transition: all 0.6s ease;
  backdrop-filter: blur(15px);
}

html.dark .sensor-card {
  background: linear-gradient(145deg, 
              var(--card-bg) 0%, 
              rgba(30, 41, 59, 0.9) 100%);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 
    var(--shadow-soft),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

/* Borde superior con el MISMO border radius que la card */
.sensor-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  border-radius: 16px 16px 0 0;
  background: var(--temperature-gradient);
  opacity: 0;
  transition: all 0.6s ease;
  z-index: 1;
}

.sensor-card.temperature::before {
  background: var(--temperature-gradient);
}

.sensor-card.pressure::before {
  background: var(--pressure-gradient);
}

.sensor-card.humidity::before {
  background: var(--humidity-gradient);
}

.sensor-card.altitude::before {
  background: var(--altitude-gradient);
}

.sensor-card.battery::before {
  background: var(--battery-gradient);
}

.sensor-card:hover::before {
  opacity: 1;
}

/* Efectos hover MUY SUAVES */
.sensor-card:hover {
  transform: translateY(-2px);
  box-shadow: 
    var(--shadow-hover),
    var(--shadow-glow);
}

/* Fondos con gradientes sutiles */
.sensor-card.temperature {
  background: linear-gradient(145deg, 
              var(--card-bg) 0%, 
              rgba(255, 107, 107, 0.04) 100%);
}

.sensor-card.pressure {
  background: linear-gradient(145deg, 
              var(--card-bg) 0%, 
              rgba(78, 205, 196, 0.04) 100%);
}

.sensor-card.humidity {
  background: linear-gradient(145deg, 
              var(--card-bg) 0%, 
              rgba(69, 183, 209, 0.04) 100%);
}

.sensor-card.altitude {
  background: linear-gradient(145deg, 
              var(--card-bg) 0%, 
              rgba(150, 206, 180, 0.04) 100%);
}

.sensor-card.battery {
  background: linear-gradient(145deg, 
              var(--card-bg) 0%, 
              rgba(255, 217, 61, 0.04) 100%);
}

/* ---------------- HEADER CON TRANSICIONES LENTAS ---------------- */
.sensor-header {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0 0.3rem;
  position: relative;
  z-index: 2;
}

.sensor-header i {
  font-size: 1.6rem;
  transition: all 0.5s ease;
}

.sensor-card.temperature .sensor-header i {
  background: var(--temperature-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 4px rgba(255, 107, 107, 0.2));
}

.sensor-card.pressure .sensor-header i {
  background: var(--pressure-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 4px rgba(78, 205, 196, 0.2));
}

.sensor-card.humidity .sensor-header i {
  background: var(--humidity-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 4px rgba(69, 183, 209, 0.2));
}

.sensor-card.altitude .sensor-header i {
  background: var(--altitude-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 4px rgba(150, 206, 180, 0.2));
}

.sensor-card.battery .sensor-header i {
  background: var(--battery-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 4px rgba(255, 217, 61, 0.2));
}

.sensor-card:hover .sensor-header i {
  transform: scale(1.05);
}

.sensor-header h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.01em;
  transition: all 0.5s ease;
}

.sensor-card.temperature .sensor-header h3 {
  background: var(--temperature-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sensor-card.pressure .sensor-header h3 {
  background: var(--pressure-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sensor-card.humidity .sensor-header h3 {
  background: var(--humidity-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sensor-card.altitude .sensor-header h3 {
  background: var(--altitude-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sensor-card.battery .sensor-header h3 {
  background: var(--battery-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.sensor-card:hover .sensor-header h3 {
  transform: translateX(2px);
}

/* ---------------- BOTÓN CON TRANSICIÓN LENTA ---------------- */
.chart-btn-wrapper {
  display: flex;
  justify-content: center;
  margin-top: 0.2rem;
  padding: 0 0.3rem;
  position: relative;
  z-index: 2;
}

.storm-btn.storm-btn-small {
  min-width: 130px;
  font-size: 0.85rem;
  border-radius: 50px;
  padding: 0.6rem 1.2rem;
  background: linear-gradient(135deg, var(--primary-color), #6366f1);
  color: white;
  border: none;
  box-shadow: 
    0 4px 12px rgba(79, 70, 229, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
  transition: all 0.5s ease;
  font-weight: 700;
  letter-spacing: 0.02em;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
}

.storm-btn.storm-btn-small::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, 
              transparent, 
              rgba(255, 255, 255, 0.2), 
              transparent);
  transition: left 0.7s ease;
}

.storm-btn.storm-btn-small:hover::before {
  left: 100%;
}

.storm-btn.storm-btn-small:hover {
  transform: translateY(-1px);
  box-shadow: 
    0 6px 16px rgba(79, 70, 229, 0.25),
    inset 0 1px 0 rgba(255, 255, 255, 0.4);
}

/* ---------------- CONTENIDO CON EFECTOS MUY SUAVES ---------------- */
.sensor-content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.5rem;
  position: relative;
  z-index: 2;
}

.sensor-figure {
  width: 100%;
  max-width: 240px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
  text-align: center;
}

.sensor-image {
  display: block;
  width: 100%;
  max-height: 160px;
  object-fit: contain;
  filter: 
    drop-shadow(0 6px 12px rgba(0, 0, 0, 0.1))
    brightness(1.02);
  transition: all 0.6s ease;
  transform-origin: center bottom;
}

.sensor-card:hover .sensor-image {
  transform: scale(1.03) translateY(-1px);
  filter: 
    drop-shadow(0 8px 16px rgba(0, 0, 0, 0.15))
    brightness(1.04);
}

/* Valor numérico con transición suave */
.sensor-value {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1;
  padding: 0.5rem 0;
  position: relative;
  transition: all 0.5s ease;
}

.sensor-card:hover .sensor-value {
  transform: scale(1.02);
}

.sensor-figure--temperature .sensor-value {
  background: var(--temperature-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 4px rgba(255, 107, 107, 0.15));
}

.sensor-figure--pressure .sensor-value {
  background: var(--pressure-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 4px rgba(78, 205, 196, 0.15));
}

.sensor-figure--humidity .sensor-value {
  background: var(--humidity-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 4px rgba(69, 183, 209, 0.15));
}

.sensor-figure--altitude .sensor-value {
  background: var(--altitude-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 4px rgba(150, 206, 180, 0.15));
}

.sensor-figure--battery .sensor-value {
  background: var(--battery-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 4px rgba(255, 217, 61, 0.15));
}

/* ---------------- ESTADO SIN LECTURAS ---------------- */
.no-readings {
  background: linear-gradient(145deg, var(--card-bg), rgba(255, 255, 255, 0.9));
  color: var(--text-color);
  border-radius: 16px;
  padding: 3rem 2rem;
  text-align: center;
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(15px);
}

.no-readings-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.2rem;
}

.no-readings-content i {
  font-size: 3rem;
  background: var(--temperature-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 4px 8px rgba(255, 107, 107, 0.2));
}

.no-readings-content h3 {
  margin: 0;
  font-weight: 700;
  font-size: 1.4rem;
  background: linear-gradient(135deg, var(--text-color), var(--text-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ---------------- MODO OSCURO ---------------- */
html.dark .sensor-card {
  border: 1px solid rgba(255, 255, 255, 0.08);
}

html.dark .storm-btn.storm-btn-small {
  box-shadow: 
    0 4px 12px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}