/* ==============================
   Variables
============================== */
:root {
  --primary-color: #0b0b0b;
  --primary-color-dark: #343738;
  --secondary-color: #e0f2fe;
  --text-color: #333;
  --text-subtitle: #444;
  --text-muted: #777;
  --border-color: #eee;
  --radius: 0.8rem; /* 8px */
  --transition-fast: 0.2s;
  --transition-medium: 0.3s;
  --transition-slow: 0.4s;
}

/* ==============================
   Base
============================== */
html {
  font-size: 62.5%; /* 1rem = 10px */
  height: 100%;            
  margin: 0;    
}

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

body {
  font-family: system-ui, sans-serif;
  line-height: 1.6;
  font-size: 1.6rem;
  color: var(--text-color);
  height: 100%;            
  margin: 0;
  display: flex;
  flex-direction: column;   /* Columna: header → main → footer */
  min-height: 100vh;   
}

main {
  flex: 1;
}

.container {
  width: 90%;
  max-width: 120rem;
  margin: auto;
}

/* ==============================
   Header
============================== */
.header {
  padding: 2rem 0;
  border-bottom: 0.2rem solid var(--border-color);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  width: 14rem;
  height: auto;
  display: block;
}

/* ==============================
   Hero
============================== */
.hero {
  padding: 6rem 1rem 4rem;
  text-align: center;
}

.tag {
  display: inline-block;
  background: var(--secondary-color);
  color: var(--primary-color);
  padding: .8rem 1.8rem;
  border-radius: 20rem;
  font-size: 1.4rem;
}

.hero-title {
  font-size: 4rem;
  margin: 1.4rem 0;
}


.hero-subtitle {
  font-size: 1.6rem;
  color: var(--text-subtitle);
  max-width: 60rem; /* 600px */
  margin: 0 auto 2rem;
}

/* ==============================
   Dropzone
============================== */
.dropzone {
  border: 0.2rem dashed #ccc;
  padding: 4rem;
  border-radius: var(--radius);
  margin: 3rem 0;
  cursor: pointer;
  transition: background-color var(--transition-medium), border-color var(--transition-medium);
  font-size: 1.4rem;
}

.dropzone.dragover {
  background-color: #eef;
  border-color: var(--primary-color);
}

/* ==============================
   Preview
============================== */
.preview-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.preview-item {
  text-align: center;
  width: 20rem; 
  opacity: 0;
  transform: translateY(2rem);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.preview-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.preview-item img {
  max-height: 15rem;
  max-width: 90%; 
  display: block;
  margin: 0 auto 0.5rem auto;
}

.preview-name {
  font-size: 1.2rem;
  width: 90%;
  margin-bottom: 1rem;
}

/* ==============================
   Buttons
============================== */
.btn {
  padding: 1.8rem 1.5rem;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 1.9rem;
  transition: filter var(--transition-medium), transform var(--transition-fast);
}

.btn:hover {
  filter: brightness(90%);
  transform: scale(1.03);
}

.btn.primary {
  background: var(--primary-color);
  color: #fff;
}

.btn.outline {
  border: 0.2rem solid var(--primary-color);
  background: #fff;
  color: var(--primary-color);
  text-decoration: none;
}

.buttons {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-top: 1.5rem;
}

.downloadBtn {
  margin: 1.6rem 0;
  padding: 1rem 0;
  font-size: 1.6rem;
}

/* ==============================
   Donar
============================== */
.btn-donar {
  background: var(--primary-color);
  color: #fff;
  padding: 1.4rem 2.0rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-size: 1.9rem;
  transition: background var(--transition-medium), transform var(--transition-fast);
}

.btn-donar:hover {
  background: var(--primary-color-dark);
  transform: scale(1.05);
}

/* ==============================
   Sections
============================== */

.advantages {
  padding: 4rem 2rem;
  background-color: #f9f9f9; /* fondo suave */
  text-align: center;

}

.advantages h3 {
  margin-bottom: 3rem;
  font-size: 2.1rem;
  color: #1c1313;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(22rem, 1fr));
  gap: 2rem;
}

.card {
  background: #fff;
  border: .1rem dashed #030303;
  border-radius: 1.2rem;
  padding: 5rem;
  font-size: 1.8rem;
  color: #333;
  box-shadow: 0 .4rem .6rem rgba(0,0,0,0.1);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;   /* ícono arriba, texto debajo */
  align-items: center;      /* centra horizontal */
  text-align: center;       /* centra texto */
}

.card .icon {
  width: 5rem;
  height: 5rem;
  margin-bottom: 1.7rem; 
  color: inherit; /* color inicial del icono */
  transition: color 0.3s ease;
}

.card:hover {
  transform: translateY(-.5rem);
  box-shadow: 0 .8rem 1.2rem rgba(0,0,0,0.15);
  background: #000;    /* fondo negro */
  color: #fff;         /* texto e íconos en blanco */
  border-color: #fff;  /* borde blanco */
}


 
.donation .icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.info {
  font-size: 1.2rem;
  color: var(--text-muted);
  margin-top: 0.5rem;

}
.donation h3 {
  font-size: 2rem;
  text-align: center;
  margin-top: 2rem;
} 
.donation p {
  text-align: center;
  margin-top: .6rem;
  margin-bottom: 2rem;
}

.donation .buttons {
  padding-bottom: 2.5rem;
}
/* ==============================
   Footer
============================== */
.footer {
  border-top: 0.2rem solid var(--border-color);
  border-bottom: 0.5rem;
  padding: 1.5rem 0;
  font-size: 1.4rem;
  color: var(--text-muted);
  text-align: center;
}

/* ==============================
   Responsive
============================== */
@media (min-width: 768px) {
  .hero-title { font-size: 3.5rem; }
  .hero-subtitle { font-size: 1.6rem; }
  .preview-container { flex-direction: row; justify-content: space-evenly; gap: 2rem; }
}

/* ==============================
   Helpers 
============================== */
.hidden { display: none; }
.padding-preview{ padding: 6.5rem 0; }

/* ==============================
   Spinner
============================== */
.spinner {
  border: 0.8rem solid #f3f3f3; 
  border-top: 0.8rem solid var(--primary-color); 
  border-radius: 50%;
  width: 6rem; 
  height: 6rem;
  animation: spin 1s linear infinite;
  margin: 5rem auto;
  display: none;
}

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

/* Fade-in previews */
.preview-item {
  opacity: 0;
  transform: translateY(2rem);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.preview-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.donaciones {
  text-align: center;
  padding: 6rem 2rem;
}

.donaciones h2 {
  font-size: 3.4rem;
  margin-bottom: 1rem;
  color: #222;
}

.donaciones .intro {
  font-size: 2.2rem;
  color: #030303;
  margin-bottom: 4rem;
}

.card-donacion {
  background: #fff;
  border: .1rem dashed #030303;
  border-radius: 1.2rem;
  padding: 4rem 2rem;
  text-align: center;
  color: #444;
  box-shadow: 0 .4rem .6rem rgba(0,0,0,0.1);
  transition: transform 0.2s ease, background 0.3s ease, color 0.3s ease, border 0.3s ease;
  text-decoration: none; 
}

.card-donacion:hover {
  transform: translateY(-.5rem);
  background: #000;
  color: #fff;
  border: .1rem solid #fff;
  box-shadow: 0 .8rem 1.2rem rgba(0,0,0,0.15);
}
.icono-donacion {
  width: 11rem;   
  height: auto;
  margin-bottom: 1.5rem;
  display: block;
  margin-left: auto;
  margin-right: auto;
}