* {
  box-sizing: border-box;
}

/* =========================================
   BODY / MODO OSCURO DEFAULT
========================================= */

body {
  margin: 0;
  background: #1d1d1b;
  color: #ffffff;
}

/* =========================================
   HEADER / MENÚ
========================================= */

/* MENÚ BLANCO EN MODO OSCURO */

.site-header {
  background: #ffffff;
}

.logo,
.main-nav a,
.theme-toggle {
  color: #1d1d1b;
}

.burger span {
  background: #1d1d1b;
}

/* =========================================
   CONTENIDO
========================================= */

.projects-page {
  padding: 120px 5vw 85px;
  font-family: Arial, sans-serif;
}

.projects-hero {
  text-align: center;
  margin-bottom: 70px;
}

.projects-hero h1 {
  margin: 0;
  font-size: clamp(42px, 5.3vw, 82px);
  line-height: 0.95;
  font-weight: 400;
  letter-spacing: 0.02em;
}

.projects-hero span {
  display: inline-block;
}

/* =========================================
   FILTROS
========================================= */

.project-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 22px;
  margin-bottom: 85px;
}

.filter-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  border: none;
  background: transparent;
  color: #ffffff;
  cursor: pointer;
  font: inherit;
  font-size: 15px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  padding: 0;
}

.filter-box {
  width: 18px;
  height: 18px;
  border: 1.5px solid #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  color: transparent;
  font-size: 14px;
  line-height: 1;
}

.filter-btn.active .filter-box {
  color: #ffffff;
}

.filter-btn:hover {
  opacity: 0.7;
}

/* =========================================
   GRID
========================================= */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 38px 16px;
}

.project-card {
  display: none;
  position: relative;
}

.project-card.visible {
  display: block;
}

.project-card h2 {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1;
  font-weight: 400;
  text-transform: uppercase;
}

/* =========================================
   ENLACES
========================================= */

.project-card a {
  display: block;
  position: relative;
  z-index: 10;
  overflow: hidden;
  background: #ffffff;
  cursor: pointer;
}

/* =========================================
   IMÁGENES
========================================= */

.project-card img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1.28;
  object-fit: cover;
  filter: grayscale(100%);
  transition: filter 0.35s ease, transform 0.35s ease;
  pointer-events: auto;
}

.project-card a:hover img {
  filter: grayscale(0%);
  transform: scale(1.04);
}

.project-card::before,
.project-card::after {
  pointer-events: none;
}

/* =========================================
   BOTÓN VER MÁS
========================================= */

.load-more-wrapper {
  display: flex;
  justify-content: center;
  margin-top: 70px;
}

.load-more-btn {
  min-width: 250px;
  padding: 18px 42px;
  border: none;
  background: #ffffff;
  color: #1d1d1b;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.load-more-btn:hover {
  opacity: 0.75;
  transform: translateY(-2px);
}

.load-more-btn.hide {
  display: none;
}

/* =========================================
   ANIMACIÓN SCROLL
========================================= */

.reveal {
  opacity: 0;
  transform: translateY(55px);
  transition: opacity 0.9s ease, transform 0.9s ease;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* =========================================
   MODO CLARO
========================================= */

body.light-mode {
  background: #ffffff;
  color: #1d1d1b;
}

/* MENÚ NEGRO EN MODO CLARO */

body.light-mode .site-header {
  background: #1d1d1b;
}

body.light-mode .logo,
body.light-mode .main-nav a,
body.light-mode .theme-toggle {
  color: #ffffff;
}

body.light-mode .burger span {
  background: #ffffff;
}

/* FILTROS */

body.light-mode .filter-btn {
  color: #1d1d1b;
}

body.light-mode .filter-box {
  border-color: #1d1d1b;
}

body.light-mode .filter-btn.active .filter-box {
  color: #1d1d1b;
}

/* BOTÓN */

body.light-mode .load-more-btn {
  background: #1d1d1b;
  color: #ffffff;
}

/* CARDS */

body.light-mode .project-card a {
  background: #1d1d1b;
}

/* =========================================
   RESPONSIVE
========================================= */

@media (max-width: 900px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .projects-hero {
    text-align: left;
  }

  .project-filters {
    justify-content: flex-start;
  }
}

@media (max-width: 600px) {
  .projects-page {
    padding: 45px 6vw 70px;
  }

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

  .projects-hero {
    margin-bottom: 55px;
  }

  .project-filters {
    margin-bottom: 60px;
    gap: 16px;
  }

  .load-more-btn {
    width: 100%;
  }
}