/* VARIABLES */
:root {
  --bg-color: #f8fafc;
  --text-color: #0f172a;
  --card-bg: #ffffff;
  --accent: #06b6d4;
  --accent-dark: #0891b2;
  --secondary: #8b5cf6;
  --gradient-1: linear-gradient(135deg, #06b6d4 0%, #8b5cf6 100%);
  --gradient-2: linear-gradient(135deg, #0f766e 0%, #164e63 100%);
}

body.dark {
  --bg-color: #0f172a;
  --text-color: #f1f5f9;
  --card-bg: #1e293b;
  --accent: #06b6d4;
  --accent-dark: #0891b2;
  --secondary: #a78bfa;
  --gradient-1: linear-gradient(135deg, #0891b2 0%, #7c3aed 100%);
  --gradient-2: linear-gradient(135deg, #0f766e 0%, #164e63 100%);
}

/* GENERAL */
body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  padding: 0;
  transition: all 0.4s ease;
  line-height: 1.6;
}

header {
  background: var(--gradient-1);
  padding: 30px 20px;
  color: white;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 8px 32px rgba(6, 182, 212, 0.2);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 3px solid var(--accent-dark);
}

header h1 {
  margin: 0;
  font-size: 2em;
  font-weight: 700;
  letter-spacing: -0.5px;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

#bm_oscuro {
  background: rgba(255, 255, 255, 0.2);
  border: 2px solid white;
  padding: 10px 14px;
  border-radius: 12px;
  cursor: pointer;
  font-size: 20px;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}

#bm_oscuro:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.1);
}

/* BUSCADOR */
.seccion_buscar {
  display: flex;
  justify-content: center;
  padding: 40px 20px;
}

.seccion_buscar input {
  padding: 14px 20px;
  width: 350px;
  max-width: 90%;
  border-radius: 12px;
  border: 2px solid var(--accent);
  background: var(--card-bg);
  color: var(--text-color);
  font-size: 16px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(6, 182, 212, 0.1);
}

.seccion_buscar input:focus {
  outline: none;
  border-color: var(--secondary);
  box-shadow: 0 8px 25px rgba(139, 92, 246, 0.2);
  transform: translateY(-2px);
}

.seccion_buscar input::placeholder {
  color: var(--text-color);
  opacity: 0.6;
}

/* TARJETAS */
.cards-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
  padding: 40px 20px;
  max-width: 1400px;
  margin: 0 auto;
}

.card {
  background: var(--card-bg);
  padding: 10px;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  border: 1px solid rgba(6, 182, 212, 0.1);
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--gradient-1);
  opacity: 0;
  transition: all 0.4s ease;
  z-index: -1;
}

.card:hover {
  transform: translateY(-8px) scale(1.02);
  box-shadow: 0 20px 40px rgba(6, 182, 212, 0.15);
  border-color: var(--accent);
}

.card:hover::before {
  opacity: 0.05;
  left: 0;
}

.card h3 {
  color: var(--accent);
  margin: 0;
  padding: 20px 20px 10px 20px;
  font-size: 1.4em;
  font-weight: 700;
  transition: color 0.3s ease;
}

.card:hover h3 {
  color: var(--secondary);
}

/* IMÁGENES Y FLECHAS */
.img-box {
  position: relative;
  overflow: hidden;
  height: 200px;
  background: var(--gradient-2);
}

.dep-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
  transition: transform 0.4s ease;
}

.img-box:hover .dep-img {
  transform: scale(1.08);
}

.btn-left,
.btn-right {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(6, 182, 212, 0.8);
  color: white;
  border: none;
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  opacity: 0;
  transition: all 0.3s ease;
  font-weight: 600;
  backdrop-filter: blur(10px);
  z-index: 10;
}

.img-box:hover .btn-left,
.img-box:hover .btn-right {
  opacity: 1;
}

.btn-left:hover,
.btn-right:hover {
  background: var(--secondary);
  transform: translateY(-50%) scale(1.1);
}

.btn-left {
  left: 10px;
}

.btn-right {
  right: 10px;
}

/* LOADER */
.loader {
  border: 4px solid rgba(6, 182, 212, 0.1);
  border-top: 4px solid var(--accent);
  border-right: 4px solid var(--secondary);
  border-radius: 50%;
  width: 50px;
  height: 50px;
  margin: 40px auto;
  animation: spin 1.2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

.hidden {
  display: none;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  50% {
    transform: rotate(180deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* FOOTER */
footer {
  text-align: center;
  padding: 30px 20px;
  color: var(--text-color);
  border-top: 2px solid var(--accent);
  background: linear-gradient(to bottom, transparent, var(--accent));
  background-image: linear-gradient(
    to bottom,
    transparent,
    rgba(6, 182, 212, 0.05)
  );
  margin-top: 40px;
  font-weight: 500;
}

footer p {
  margin: 0;
  font-size: 1em;
}