/* VADIN Website — Global Styles */

/* ============================================
   CSS Variables
   ============================================ */
:root {
  --color-bg: #ffffff;
  --color-text: #2c3e50;
  --color-text-light: #54657e;
  --color-border: #e1e8ed;
  --color-accent: #3498db;
  --color-accent-dark: #2980b9;
  --color-footer-bg: #f8f9fa;
  
  --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-mono: "Courier New", Courier, monospace;
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  
  --border-radius: 0.25rem;
  --line-height-base: 1.6;
  --line-height-heading: 1.2;
  
  --max-width: 900px;
  --transition-base: 150ms ease-in-out;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-base);
  font-size: 1rem;
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}

/* ============================================
   Typography
   ============================================ */
h1 {
  font-size: 2.5rem;
  font-weight: 700;
  line-height: var(--line-height-heading);
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

h2 {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: var(--line-height-heading);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: var(--line-height-heading);
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

h4, h5, h6 {
  font-size: 1rem;
  font-weight: 600;
  line-height: var(--line-height-heading);
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

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

p:last-child {
  margin-bottom: 0;
}

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

a:hover {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

strong {
  font-weight: 600;
}

em {
  font-style: italic;
}

ul, ol {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

li {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-light);
}

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

/* ============================================
   Header
   ============================================ */
header {
  border-bottom: 1px solid var(--color-border);
  padding: 10px 0;
  background-color: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: 100px;
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 80px;
}

.logo {
  display: inline-block;
  text-decoration: none;
  line-height: 0;
}

.logo img {
  height: 80px;
  width: auto;
  display: block;
  transition: opacity var(--transition-base);
}

.logo:hover {
  text-decoration: none;
}

.logo:hover img {
  opacity: 0.8;
}

/* ============================================
   Navigation
   ============================================ */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  flex-direction: column;
  gap: 5px;
  z-index: 101;
}

.menu-toggle span {
  display: block;
  width: 25px;
  height: 2px;
  background-color: var(--color-text);
  transition: all var(--transition-base);
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

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

nav.main-nav a {
  font-size: 0.95rem;
  color: var(--color-text-light);
  transition: color var(--transition-base);
}

nav.main-nav a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

nav.main-nav a.active {
  color: var(--color-accent);
  font-weight: 600;
}

/* ============================================
   Main Content
   ============================================ */
main {
  padding: 0;
  min-height: calc(100vh - 200px);
}

main > .container {
  padding-top: var(--spacing-2xl);
}

.page-header {
  margin-bottom: var(--spacing-2xl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--color-border);
}

.page-header h1 {
  margin-bottom: var(--spacing-md);
}

.page-header p {
  font-size: 1.1rem;
  color: var(--color-text-light);
}

/* ============================================
   Hero Section (Home)
   ============================================ */
.hero {
  position: relative;
  width: 100%;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 0 var(--spacing-2xl) 0;
  overflow: hidden;
}

.hero-background {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.hero-background img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.hero-background::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.4);
  z-index: 2;
}

.hero-content {
  position: relative;
  z-index: 3;
  width: 100%;
  text-align: center;
  padding: var(--spacing-2xl) 0;
}

.hero-content h1 {
  font-size: 3.5rem;
  margin-bottom: var(--spacing-md);
  color: #ffffff;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-content .subtitle {
  font-size: 1.25rem;
  line-height: 1.8;
  color: #ffffff;
  max-width: 700px;
  margin: 0 auto var(--spacing-md);
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
}

.hero-content .tagline {
  font-size: 1.5rem;
  color: #ffffff;
  margin-bottom: 0;
  font-weight: 600;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.5);
}

.subtitle {
  font-size: 1.1rem;
  line-height: 1.8;
  color: var(--color-text-light);
  max-width: 700px;
  margin: 0 auto var(--spacing-lg);
}

.tagline {
  font-size: 1.25rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
  font-weight: 500;
}

/* ============================================
   Images
   ============================================ */
.hero-image {
  margin-bottom: var(--spacing-xl);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.hero-image img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  max-height: 400px;
}

.content-image {
  margin: var(--spacing-xl) 0;
  border-radius: var(--border-radius);
  overflow: hidden;
}

.content-image img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  max-height: 350px;
}

.content-image-full img {
  max-height: none;
  object-fit: contain;
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
  margin: var(--spacing-xl) 0;
}

.image-grid-item {
  border-radius: var(--border-radius);
  overflow: hidden;
}

.image-grid-item img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  max-height: 250px;
  margin-bottom: var(--spacing-md);
}

/* ============================================
   Cards & Sections
   ============================================ */
.section-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
}

.card {
  padding: var(--spacing-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background-color: var(--color-bg);
  transition: border-color var(--transition-base);
}

.card:hover {
  border-color: var(--color-accent);
}

.card h3 {
  margin-top: 0;
  color: var(--color-text);
}

.card p {
  margin-bottom: var(--spacing-sm);
  font-size: 0.95rem;
}

.card-link {
  display: inline-block;
  margin-top: var(--spacing-sm);
  font-weight: 600;
}

/* ============================================
   Lists & Emphasis
   ============================================ */
.highlight-list {
  list-style: none;
  margin-left: 0;
}

.highlight-list li {
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  position: relative;
}

.highlight-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: bold;
}

.definition-list {
  margin-bottom: var(--spacing-lg);
}

.definition-list dt {
  font-weight: 600;
  margin-top: var(--spacing-md);
  color: var(--color-text);
}

.definition-list dd {
  margin-left: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-light);
}

/* ============================================
   Divider
   ============================================ */
hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--spacing-2xl) 0;
}

/* ============================================
   Footer
   ============================================ */
footer {
  background-color: var(--color-footer-bg);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-2xl) 0;
  margin-top: var(--spacing-2xl);
}

footer .container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.footer-section h4 {
  margin-top: 0;
  color: var(--color-text);
}

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

.footer-logo img {
  height: 45px;
  width: auto;
}

.footer-section ul {
  list-style: none;
  margin-left: 0;
}

.footer-section a {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

.footer-bottom {
  text-align: center;
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-light);
  font-size: 0.85rem;
}

/* ============================================
   Accessibility
   ============================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ============================================
   Contact Form
   ============================================ */
.contact-form {
  max-width: 600px;
  margin: var(--spacing-xl) 0;
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--color-text);
  font-size: 0.95rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  font-family: var(--font-family-base);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: border-color var(--transition-base);
  box-sizing: border-box;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.btn-submit {
  background-color: var(--color-accent);
  color: #ffffff;
  border: none;
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1rem;
  font-weight: 600;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: background-color var(--transition-base);
  font-family: var(--font-family-base);
}

.btn-submit:hover {
  background-color: var(--color-accent-dark);
  text-decoration: none;
}

.btn-submit:active {
  transform: translateY(1px);
}

/* ============================================
   WhatsApp Floating Button
   ============================================ */
.whatsapp-float {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 60px;
  height: 60px;
  background-color: #25D366;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(37, 211, 102, 0.4);
  z-index: 1000;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
  text-decoration: none;
  color: #ffffff;
}

.whatsapp-float:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 16px rgba(37, 211, 102, 0.6);
  text-decoration: none;
  color: #ffffff;
}

.whatsapp-float:active {
  transform: scale(0.95);
}

.whatsapp-float svg {
  width: 32px;
  height: 32px;
}

/* ============================================
   Partners & Sponsors Section
   ============================================ */
.partners-section {
  background-color: var(--color-footer-bg);
  padding: var(--spacing-2xl) 0;
  margin-top: var(--spacing-2xl);
  overflow: hidden;
}

.partners-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  color: var(--color-text);
}

.partners-scroll {
  width: 100%;
  overflow: hidden;
  position: relative;
}

.partners-track {
  display: flex;
  gap: var(--spacing-2xl);
  width: fit-content;
  animation: scroll-partners 30s linear infinite;
  will-change: transform;
}

.partners-track:hover {
  animation-play-state: paused;
}

.partner-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 150px;
  height: 100px;
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: #ffffff;
  border-radius: var(--border-radius);
  transition: transform var(--transition-base), opacity var(--transition-base);
  text-decoration: none;
  flex-shrink: 0;
}

.partner-logo:hover {
  transform: scale(1.05);
  opacity: 0.9;
}

.partner-logo img {
  max-width: 100%;
  max-height: 80px;
  width: auto;
  height: auto;
  object-fit: contain;
  filter: grayscale(100%);
  opacity: 0.7;
  transition: filter var(--transition-base), opacity var(--transition-base);
}

.partner-logo:hover img {
  filter: grayscale(0%);
  opacity: 1;
}

@keyframes scroll-partners {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-50%);
  }
}

/* ============================================
   Utility Classes
   ============================================ */
.text-center {
  text-align: center;
}

.text-light {
  color: var(--color-text-light);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mb-lg {
  margin-bottom: var(--spacing-lg);
}

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