:root {
  --primary: #0d6efd;
  --bg: #f5f6f8;
  --card-bg: #ffffff;
  --text-main: #1f2937;
  --text-muted: #6b7280;
  --highlight: #ecfdf5;
  --highlight-border: #10b981;

  /* Bordes y sombras consistentes */
  --radius: 12px;
  --shadow-soft: 0 2px 5px rgba(0,0,0,0.06);
  --shadow-medium: 0 4px 12px rgba(0,0,0,0.10);
  --shadow-strong: 0 6px 18px rgba(16,185,129,0.22);
}

/* ------------------------------
   BASE
------------------------------ */

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

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text-main);
  padding-bottom: 90px;
  line-height: 1.55;
}

/* ------------------------------
   HEADER
------------------------------ */

header {
  background: var(--primary);
  color: #fff;
  padding: 1.4rem;
  text-align: center;
  box-shadow: var(--shadow-medium);
  border-radius: var(--radius);
}

header h1 {
  font-weight: 700;
  letter-spacing: -0.5px;
}

header p {
  margin-top: 4px;
  opacity: 0.9;
}

/* ------------------------------
   LAYOUT PRINCIPAL
------------------------------ */

main {
  max-width: 1300px;
  margin: 1rem auto;
  padding: 1rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

/* ------------------------------
   TARJETA DE CONTROLES
------------------------------ */

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow-soft);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.controls select {
  padding: 0.5rem 0.8rem;
  border-radius: var(--radius);
  border: 1px solid #d1d5db;
  background: #fff;
  font-size: 0.9rem;
  box-shadow: var(--shadow-soft);
}

/* ------------------------------
   LAYOUT MAPA + LISTA
------------------------------ */

.layout-split {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

@media (min-width: 768px) {
  .layout-split {
    flex-direction: row;
  }

  .map-container {
    flex: 0 0 55%;
  }

  .gas-list {
    flex: 0 0 45%;
  }
}

/* ------------------------------
   MAPA
------------------------------ */

.map-container {
  flex: 1;
  height: 330px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid #d1d5db;
  box-shadow: var(--shadow-medium);
  opacity: 0;
  animation: fadeInUp .4s ease-out forwards;
}

#map {
  width: 100%;
  height: 100%;
}

/* ------------------------------
   LISTADO
------------------------------ */

.gas-list {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  max-height: 75vh;
  overflow-y: auto;
  padding-top: 6px;
}

/* ------------------------------
   TARJETAS DE GASOLINERAS
------------------------------ */

.gas-item {
  background: #fff;
  border-radius: var(--radius);
  padding: 0.8rem 1rem;
  border: 1px solid #e5e7eb;
  box-shadow: var(--shadow-soft);
  transition: transform .2s ease, box-shadow .2s ease;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.4rem;

  opacity: 0;
  animation: fadeInUp .35s ease-out forwards;
}

.gas-item:nth-child(1) { animation-delay: .05s; }
.gas-item:nth-child(2) { animation-delay: .10s; }
.gas-item:nth-child(3) { animation-delay: .15s; }
.gas-item:nth-child(4) { animation-delay: .20s; }
.gas-item:nth-child(5) { animation-delay: .25s; }

.gas-item:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-medium);
}

.gas-name {
  font-size: 1rem;
  font-weight: 700;
}

.gas-address {
  font-size: .8rem;
  color: var(--text-muted);
}

.gas-meta {
  font-size: .75rem;
  color: #4b5563;
}

.gas-price {
  font-size: 1.15rem;
  font-weight: 800;
  color: #059669;
}

.fuel-type {
  font-size: 0.7rem;
  color: #4b5563;
  margin-top: 2px;
}

/* ------------------------------
   TARJETA MÁS BARATA PREMIUM 2.0
------------------------------ */

.gas-item.best {
  border: 2px solid var(--highlight-border);
  background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
  box-shadow: var(--shadow-strong);
  padding: 1.2rem;
  animation: bestPop .45s ease-out forwards !important;
  opacity: 1 !important;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.best-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.best-icon {
  font-size: 1.3rem;
}

.best-label {
  background: #10b981;
  color: white;
  padding: 3px 8px;
  border-radius: var(--radius);
  font-size: 0.75rem;
  font-weight: 700;
}

.best-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: #065f46;
}

.best-price {
  font-size: 1.6rem;
  font-weight: 800;
  color: #047857;
}

.best-distance {
  font-size: 0.9rem;
  color: #065f46;
  font-weight: 600;
}

.best-address {
  font-size: 0.8rem;
  color: #4b5563;
  margin-bottom: 6px;
}

.best-route-btn {
  margin-top: 6px;
  background: #10b981;
  color: white;
  padding: 8px 14px;
  border-radius: var(--radius);
  text-align: center;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: background .2s ease;
}

.best-route-btn:hover {
  background: #059669;
}

/* ------------------------------
   SKELETON LOADING
------------------------------ */

.skeleton-card {
  padding: 0.8rem;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid #e5e7eb;
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;

  opacity: 0;
  animation: fadeInUp .3s ease-out forwards;
}

.skeleton {
  background: #e5e7eb;
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}

.skeleton::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    rgba(255,255,255,0) 0%,
    rgba(255,255,255,0.6) 50%,
    rgba(255,255,255,0) 100%
  );
  animation: shimmer 1.6s infinite;
}

@keyframes shimmer {
  100% {
    transform: translateX(200%);
  }
}

/* ------------------------------
   ANIMACIONES SUAVES
------------------------------ */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes bestPop {
  0% {
    opacity: 0;
    transform: scale(.92) translateY(10px);
  }
  60% {
    opacity: 1;
    transform: scale(1.03) translateY(0);
  }
  100% {
    transform: scale(1);
  }
}

/* ------------------------------
   ADSENSE
------------------------------ */

#sticky-ad {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: #fff;
  padding: 6px 0;
  box-shadow: var(--shadow-medium);
  z-index: 99999;
  text-align: center;
}

.locate-btn {
  position: absolute;
  bottom: 20px;
  right: 20px;
  z-index: 9999;
  background: #0d6efd;
  color: white;
  border: none;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  font-size: 1.4rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.25);
  cursor: pointer;
  transition: transform .15s ease, background .2s ease;
}

.locate-btn:hover {
  background: #0b5ed7;
  transform: scale(1.07);
}

.map-container {
  position: relative;
}