/* ===================================================
   ITS FAIRS - HOJA DE ESTILOS PRINCIPAL
   International Trade Shows, S.A.
   =================================================== */

/* === IMPORTAR FUENTE GOOGLE FONTS === */
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');

/* === VARIABLES CSS === */
:root {
  --color-primary: #003087;
  --color-secondary: #0055A5;
  --color-accent: #E8A020;
  --color-white: #FFFFFF;
  --color-bg: #F4F6F9;
  --color-text: #444444;
  --font-main: 'Roboto', sans-serif;
  --border-radius: 6px;
  --shadow: 0 2px 12px rgba(0,0,0,0.10);
  --transition: all 0.25s ease;
}

/* === RESET CSS BÁSICO === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

ul, ol {
  list-style: none;
}

/* === UTILIDADES === */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.btn {
  display: inline-block;
  padding: 12px 30px;
  background-color: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--border-radius);
  font-weight: 500;
  text-align: center;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  font-size: 16px;
}

.btn:hover {
  background-color: var(--color-secondary);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.btn-accent {
  background-color: var(--color-accent);
}

.btn-accent:hover {
  background-color: #d99210;
}

/* === HEADER === */
header {
  background-color: var(--color-white);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: var(--transition);
}

header.scrolled {
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  min-width: 150px;
}

.logo img {
  height: 50px;
  width: auto;
}

/* === NAVEGACIÓN === */
.nav-menu {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-menu a {
  color: var(--color-text);
  font-weight: 500;
  padding: 8px 0;
  position: relative;
}

.nav-menu a:hover {
  color: var(--color-primary);
}

.nav-menu a.active {
  color: var(--color-primary);
  border-bottom: 3px solid var(--color-accent);
}

/* === SELECTOR DE IDIOMA === */
.lang-selector {
  display: flex;
  gap: 10px;
  margin-left: 20px;
}

.lang-selector a {
  padding: 6px 12px;
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  font-weight: 600;
  font-size: 14px;
  color: var(--color-text);
}

.lang-selector a:hover {
  border-color: var(--color-secondary);
}

.lang-selector a.active {
  border-color: var(--color-accent);
  color: var(--color-primary);
}

/* === MENÚ HAMBURGUESA (MOBILE) === */
.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 5px;
}

.hamburger span {
  display: block;
  width: 28px;
  height: 3px;
  background-color: var(--color-primary);
  transition: var(--transition);
}

/* === HERO BANNER === */
.hero {
  position: relative;
  height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: var(--color-white);
  text-align: center;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 48, 135, 0.7);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 900px;
  padding: 0 20px;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 20px;
  line-height: 1.2;
}

.hero p {
  font-size: 1.5rem;
  margin-bottom: 30px;
  font-weight: 300;
}

/* === SECCIONES === */
section {
  padding: 80px 0;
}

section h2 {
  font-size: 2.5rem;
  color: var(--color-primary);
  margin-bottom: 40px;
  text-align: center;
}

section h3 {
  font-size: 1.5rem;
  color: var(--color-secondary);
  margin-bottom: 15px;
}

.section-white {
  background-color: var(--color-white);
}

.section-gray {
  background-color: var(--color-bg);
}

/* === GRID DE 2 COLUMNAS === */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 40px;
  margin-top: 40px;
}

/* === GRID DE 3 COLUMNAS === */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-top: 40px;
}

/* === GRID DE 5 COLUMNAS === */
.grid-5 {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
  margin-top: 40px;
}

/* === TARJETAS (CARDS) === */
.card {
  background-color: var(--color-white);
  padding: 30px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
  text-align: center;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}

.card-icon {
  font-size: 3rem;
  margin-bottom: 15px;
}

.card h3 {
  margin-bottom: 15px;
  color: var(--color-primary);
}

.card p {
  line-height: 1.6;
}

/* === FORMULARIO DE CONTACTO === */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 50px;
  margin-top: 40px;
}

.contact-info {
  background-color: var(--color-white);
  padding: 30px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

.contact-info h3 {
  margin-bottom: 24px;
  color: var(--color-primary);
}

.contact-info p {
  padding: 14px 0;
  border-bottom: 1px solid var(--color-bg);
  line-height: 1.5;
}

.contact-info p:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.contact-info p:first-of-type {
  padding-top: 0;
}

.contact-info strong {
  display: block;
  margin-bottom: 6px;
  color: var(--color-secondary);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.contact-info a {
  color: var(--color-primary);
  font-weight: 500;
}

.contact-info a:hover {
  color: var(--color-accent);
}

.contact-form {
  background-color: var(--color-white);
  padding: 40px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--color-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px;
  border: 2px solid #ddd;
  border-radius: var(--border-radius);
  font-family: var(--font-main);
  font-size: 16px;
  transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-secondary);
}

.form-group textarea {
  min-height: 150px;
  resize: vertical;
}

.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 20px;
}

.form-checkbox input[type="checkbox"] {
  width: auto;
  margin-top: 4px;
}

.form-checkbox label {
  font-size: 14px;
  line-height: 1.5;
}

.form-checkbox a {
  color: var(--color-secondary);
  text-decoration: underline;
}

/* === ALERTAS === */
.alert {
  padding: 15px 20px;
  border-radius: var(--border-radius);
  margin-bottom: 20px;
  font-weight: 500;
}

.alert-success {
  background-color: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.alert-error {
  background-color: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

/* === TABLA RESPONSIVA === */
.table-responsive {
  overflow-x: auto;
  margin-top: 30px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background-color: var(--color-white);
  box-shadow: var(--shadow);
}

table th,
table td {
  padding: 15px;
  text-align: left;
  border-bottom: 1px solid #ddd;
}

table th {
  background-color: var(--color-primary);
  color: var(--color-white);
  font-weight: 600;
}

table tr:hover {
  background-color: var(--color-bg);
}

/* === ENLACES DE INTERÉS === */
.links-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  margin-top: 40px;
}

.link-card {
  background-color: var(--color-white);
  padding: 25px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
}

.link-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
  border-left: 4px solid var(--color-accent);
}

.link-card h3 {
  margin-bottom: 10px;
  color: var(--color-primary);
}

.link-card p {
  font-size: 14px;
  margin-bottom: 15px;
}

.link-card a {
  color: var(--color-secondary);
  font-weight: 500;
}

/* === LISTA DE CONSEJOS === */
.tips-list {
  max-width: 900px;
  margin: 30px auto;
}

.tips-list li {
  background-color: var(--color-white);
  padding: 20px;
  margin-bottom: 15px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  border-left: 4px solid var(--color-accent);
}

.tips-list li strong {
  color: var(--color-primary);
}

/* === FOOTER === */
footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: 50px 0 30px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  margin-bottom: 30px;
}

.footer-section h3 {
  color: var(--color-accent);
  margin-bottom: 15px;
  font-size: 1.2rem;
}

.footer-section p,
.footer-section a {
  margin-bottom: 10px;
  line-height: 1.8;
  color: var(--color-white);
}

.footer-section a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid rgba(255,255,255,0.2);
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}

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

/* Tablet (768px - 1024px) */
@media (max-width: 1024px) {
  .grid-5 {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .links-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  /* Header y Navegación Mobile */
  .header-content {
    flex-wrap: wrap;
    position: relative;
  }
  
  .hamburger {
    display: flex;
    order: 3;
  }
  
  .logo {
    order: 1;
  }
  
  .lang-selector {
    order: 2;
    margin-left: auto;
    margin-right: 20px;
  }
  
  .nav-menu {
    display: none;
    flex-direction: column;
    width: 100%;
    order: 4;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #ddd;
    gap: 15px;
  }
  
  .nav-menu.open {
    display: flex;
  }
  
  .nav-menu a {
    width: 100%;
    text-align: center;
  }
  
  /* Hero */
  .hero {
    height: 400px;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero p {
    font-size: 1.1rem;
  }
  
  /* Secciones */
  section {
    padding: 50px 0;
  }
  
  section h2 {
    font-size: 2rem;
  }
  
  /* Grids */
  .grid-2,
  .grid-3,
  .grid-5,
  .links-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  
  /* Contacto */
  .contact-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  
  /* Footer */
  .footer-content {
    grid-template-columns: 1fr;
    gap: 30px;
  }
}

/* Mobile pequeño (< 480px) */
@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.5rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  section h2 {
    font-size: 1.75rem;
  }
  
  .card {
    padding: 20px;
  }
  
  .contact-form {
    padding: 25px;
  }
  
  .btn {
    width: 100%;
  }
}