/* Base Styles */
:root {
  --color-black: #000000;
  --color-white: #ffffff;
  --color-gray-100: #f8f8f8;
  --color-gray-200: #e9e9e9;
  --color-gray-300: #d9d9d9;
  --color-gray-400: #b8b8b8;
  --color-gray-500: #979797;
  --color-gray-600: #757575;
  --color-gray-700: #545454;
  --color-gray-800: #333333;
  --color-gray-900: #1a1a1a;
  
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-xxl: 64px;
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  --header-height: 110px;
  --header-height-scrolled: 94px;
  --poster-width: 280px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: 'Cormorant Garamond', serif;
  font-weight: 300;
  font-size: 18px;
  line-height: 1.6;
  color: var(--color-gray-800);
  background-color: var(--color-white);
  overflow-x: hidden;
}

body.menu-open {
  overflow: hidden;
}

.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Playfair Display', serif;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: inherit;
  text-decoration: none;
  transition: all var(--transition-fast);
}

/* Header & Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: transparent;
  transition: all var(--transition-normal);
  z-index: 1000;
}

.header.scrolled {
  height: var(--header-height-scrolled);
  background-color: rgba(255, 255, 255, 0.95);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header .container {
  height: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  position: relative;
  height: 100px;
  display: block;
  z-index: 1001;
}

.logo img {
  height: 100%;
  width: auto;
  transition: opacity var(--transition-normal);
}

.logo-white {
  opacity: 1;
  position: absolute;
  top: 0;
  left: 0;
}

.logo-black {
  opacity: 0;
}

.header.scrolled .logo-white {
  opacity: 0;
}

.header.scrolled .logo-black {
  opacity: 1;
}

/* Desktop Navigation */
.nav {
  display: flex;
}

.nav-list {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  color: var(--color-white);
  font-size: 1.1rem;
  transition: color var(--transition-normal);
  position: relative;
}

.header.scrolled .nav-link {
  color: var(--color-black);
}

.nav-link:hover {
  color: var(--color-gray-400);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  transform: scaleX(0);
  transition: transform var(--transition-normal);
  transform-origin: right;
}

.nav-link:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Mobile Navigation */
.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background-color: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(10px);
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  z-index: 999;
}

.mobile-nav.active {
  transform: translateX(0);
}

.mobile-nav-list {
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.mobile-nav-link {
  color: var(--color-black);
  font-size: 1.5rem;
  transition: color var(--transition-normal);
  position: relative;
}

.mobile-nav-link:hover {
  color: var(--color-gray-600);
}

/* Menu Toggle Button */
.menu-toggle {
  display: none;
  position: relative;
  width: 30px;
  height: 20px;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

.menu-toggle span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--color-white);
  transition: all var(--transition-normal);
}

.header.scrolled .menu-toggle span {
  background-color: var(--color-black);
}

.menu-toggle span:nth-child(1) { top: 0; }
.menu-toggle span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.menu-toggle span:nth-child(3) { bottom: 0; }

.menu-toggle.active span {
  background-color: var(--color-black);
}

.menu-toggle.active span:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  bottom: 50%;
  transform: translateY(50%) rotate(-45deg);
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  color: var(--color-white);
  padding-top: var(--header-height);
}

.hero .parallax-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: url('../assets/img/background.jpg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  filter: brightness(0.5);
  z-index: -1;
}

/* Sections */
.section {
  padding: var(--spacing-xxl) 0;
  position: relative;
  background-color: var(--color-white);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 2px;
  background-color: var(--color-black);
}

.content-grid {
  max-width: 800px;
  margin: 0 auto;
}

/* Posters Grid */
.posters-grid {
  display: grid;
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) auto;
  width: 100%;
  justify-content: center;
}

/* Default grid layout (4 columns) */
.posters-grid {
  grid-template-columns: repeat(4, var(--poster-width));
  max-width: calc(4 * var(--poster-width) + 3 * var(--spacing-lg));
}

/* Two columns for conciertos didacticos */
#conciertos-didacticos .posters-grid {
  grid-template-columns: repeat(2, var(--poster-width));
  max-width: calc(2 * var(--poster-width) + var(--spacing-lg));
}

/* One column for conciertos beneficos */
#conciertos-beneficos .posters-grid {
  grid-template-columns: var(--poster-width);
  max-width: var(--poster-width);
}

/* Three columns for viajes section */
#viajes .posters-grid {
  grid-template-columns: repeat(3, var(--poster-width));
  max-width: calc(3 * var(--poster-width) + 2 * var(--spacing-lg));
}

/* Four columns for presentacion section */
#presentacion .posters-grid {
  grid-template-columns: repeat(4, var(--poster-width));
  max-width: calc(4 * var(--poster-width) + 3 * var(--spacing-lg));
}

.poster-container {
  width: var(--poster-width);
  aspect-ratio: 1/1.4142; /* A4 paper ratio */
  overflow: hidden;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transition: transform var(--transition-normal);
  background-color: var(--color-gray-100);
  cursor: pointer;
}

.poster-container:hover {
  transform: scale(1.02);
}

.poster-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

/* Lightbox */
.lightbox {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.9);
  z-index: 2000;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.lightbox.active {
  display: flex;
  opacity: 1;
}

.lightbox-content {
  position: relative;
  max-width: 90%;
  max-height: 90vh;
  margin: auto;
}

.lightbox-image {
  max-width: 100%;
  max-height: 90vh;
  object-fit: contain;
}

.lightbox-close {
  position: absolute;
  top: -40px;
  right: -40px;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 2rem;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.lightbox-close:hover {
  color: var(--color-gray-400);
}

/* Footer */
.footer {
  background-color: var(--color-black);
  color: var(--color-white);
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.footer-logo {
  margin-bottom: var(--spacing-md);
}

.footer-logo .logo-img {
  height: 120px;
  width: auto;
}

.footer-tagline {
  font-style: italic;
  margin-bottom: var(--spacing-md);
}

.copyright {
  font-size: 0.9rem;
  color: var(--color-gray-400);
}

/* Responsive Styles */
@media (max-width: 992px) {
  :root {
    --header-height: 94px;
    --header-height-scrolled: 86px;
    --poster-width: 240px;
  }

  .nav {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .mobile-nav {
    display: block;
  }

  .posters-grid,
  #viajes .posters-grid,
  #conciertos-didacticos .posters-grid,
  #presentacion .posters-grid {
    grid-template-columns: repeat(2, var(--poster-width));
    gap: var(--spacing-md);
    max-width: calc(2 * var(--poster-width) + var(--spacing-md));
  }

  #conciertos-beneficos .posters-grid {
    grid-template-columns: var(--poster-width);
    max-width: var(--poster-width);
  }
}

@media (max-width: 768px) {
  :root {
    --poster-width: 220px;
  }

  .container {
    width: 95%;
    padding: 0 var(--spacing-sm);
  }

  .section {
    padding: var(--spacing-xl) 0;
  }

  .lightbox-close {
    top: -30px;
    right: -10px;
  }
}

@media (max-width: 480px) {
  :root {
    --poster-width: 280px;
  }

  .posters-grid,
  #viajes .posters-grid,
  #conciertos-didacticos .posters-grid,
  #conciertos-beneficos .posters-grid,
  #presentacion .posters-grid {
    grid-template-columns: var(--poster-width);
    max-width: var(--poster-width);
    margin-left: auto;
    margin-right: auto;
  }

  body {
    font-size: 16px;
  }

  .section {
    padding: var(--spacing-lg) 0;
  }
}