/* ============================================
   VARIABLES Y RESET
   ============================================ */
:root {
  --color-primary: #8a2be2;
  --color-primary-dark: rgba(138, 43, 226, 0.9);
  --color-primary-light: rgba(128, 0, 226, 0.4);
  --color-background: #1c1a29;
  --color-card-bg: rgba(138, 43, 226, 0.1);
  --color-text: #ffffff;
  --color-text-secondary: #e0e0e0;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --border-radius: 12px;
  --transition: all 0.3s ease;
}

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

/* ============================================
   ESTILOS BASE
   ============================================ */
body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, var(--color-background) 0%, #2a1a3a 100%);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ============================================
   CONTENEDOR PRINCIPAL
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-lg);
}

/* ============================================
   HEADER
   ============================================ */
.header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-xl) 0;
}

.header__title {
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  text-shadow: 0 0 20px var(--color-primary-light);
}

.header__subtitle {
  font-size: 1.2rem;
  color: var(--color-text-secondary);
  font-weight: 300;
}

/* ============================================
   GRID DE PROYECTOS
   ============================================ */
.projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

/* ============================================
   TARJETAS DE PROYECTO
   ============================================ */
.project-card {
  background: var(--color-card-bg);
  border: 2px solid var(--color-primary-light);
  border-radius: var(--border-radius);
  padding: var(--spacing-lg);
  transition: var(--transition);
  backdrop-filter: blur(10px);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-8px);
  border-color: var(--color-primary);
  box-shadow: 0 10px 30px var(--color-primary-light);
}

.project-card__content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  flex: 1;
}

.project-card__title {
  font-size: 1.5rem;
  color: var(--color-primary);
  font-weight: 600;
}

.project-card__description {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  flex-grow: 1;
}

/* ============================================
   BOTONES
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn__icon {
  font-size: 1.2rem;
}

.btn--download {
  background: var(--color-primary);
  color: var(--color-text);
  width: 100%;
  margin-top: auto;
}

.btn--download:hover {
  background: var(--color-primary-dark);
  transform: scale(1.05);
  box-shadow: 0 5px 15px var(--color-primary-light);
}

.btn--back {
  background: linear-gradient(135deg, rgba(138, 43, 226, 0.2) 0%, rgba(138, 43, 226, 0.1) 100%);
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1.1rem;
  box-shadow: 0 4px 15px rgba(138, 43, 226, 0.2);
  position: relative;
  overflow: hidden;
}

.btn--back::before {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  transition: left 0.5s ease;
}

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

.btn--back:hover {
  background: var(--color-primary);
  color: var(--color-text);
  transform: scale(1.05);
  box-shadow: 0 8px 25px var(--color-primary-light), 0 0 30px rgba(138, 43, 226, 0.4);
  border-color: var(--color-primary);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl) 0;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
  .header__title {
    font-size: 2rem;
  }

  .header__subtitle {
    font-size: 1rem;
  }

  .projects {
    grid-template-columns: 1fr;
  }

  .container {
    padding: var(--spacing-sm);
  }
}

@media (max-width: 480px) {
  .header__title {
    font-size: 1.5rem;
  }

  .project-card {
    padding: var(--spacing-md);
  }

  .project-card__title {
    font-size: 1.2rem;
  }
}