/* VDtechworld — Travel Technology Theme */
*, *::before, *::after { box-sizing: border-box; }

:root {
  --color-primary: #0a4d8c;
  --color-primary-dark: #073560;
  --color-accent: #00a8cc;
  --color-accent-light: #4ecdc4;
  --color-warm: #f4845f;
  --color-text: #2c3e50;
  --color-text-light: #5a6d7e;
  --color-bg: #ffffff;
  --color-bg-alt: #f0f7fc;
  --color-border: #d4e4f0;
  --font-sans: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, 'Helvetica Neue', Arial, sans-serif;
  --shadow: 0 4px 24px rgba(10, 77, 140, 0.1);
  --radius: 8px;
  --max-width: 1200px;
  --header-height: 72px;
}

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

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

a { color: var(--color-primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-accent); }

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-bg);
  box-shadow: 0 2px 12px rgba(10, 77, 140, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: var(--header-height);
  gap: 16px;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--color-primary);
  white-space: nowrap;
}

.site-logo span { color: var(--color-accent); }

.nav-toggle {
  display: none;
  background: none;
  border: 2px solid var(--color-primary);
  border-radius: 6px;
  padding: 8px 12px;
  cursor: pointer;
  color: var(--color-primary);
  font-size: 1.25rem;
  line-height: 1;
}

.main-nav { display: flex; align-items: center; }

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 4px;
}

.nav-list > li { position: relative; }

.nav-list > li > a {
  display: block;
  padding: 10px 14px;
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  border-radius: 6px;
}

.nav-list > li > a:hover,
.nav-list > li > a.active {
  color: var(--color-primary);
  background: var(--color-bg-alt);
}

.nav-list .submenu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 260px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  list-style: none;
  margin: 0;
  padding: 8px 0;
  z-index: 100;
}

.nav-list > li:hover > .submenu,
.nav-list > li.submenu-open > .submenu { display: block; }

.nav-list .submenu a {
  display: block;
  padding: 10px 18px;
  color: var(--color-text);
  font-size: 0.9rem;
  font-weight: 400;
}

.nav-list .submenu a:hover {
  background: var(--color-bg-alt);
  color: var(--color-primary);
}

/* Hero Carousel */
.hero {
  position: relative;
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-accent) 100%);
  color: #fff;
  overflow: hidden;
}

.hero-slides { position: relative; min-height: 420px; }

.hero-slide {
  display: none;
  padding: 80px 0;
  text-align: center;
  animation: fadeIn 0.6s ease;
}

.hero-slide.active { display: flex; align-items: center; justify-content: center; }

.hero-slide h2 {
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  margin: 0 0 16px;
  line-height: 1.25;
  font-weight: 700;
}

.hero-slide p {
  font-size: clamp(1rem, 2vw, 1.2rem);
  margin: 0;
  opacity: 0.92;
  max-width: 640px;
  margin-inline: auto;
}

.hero-controls {
  display: flex;
  justify-content: center;
  gap: 10px;
  padding-bottom: 24px;
}

.hero-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.6);
  background: transparent;
  cursor: pointer;
  padding: 0;
  transition: background 0.2s;
}

.hero-dot.active,
.hero-dot:hover { background: #fff; border-color: #fff; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Sections */
.section { padding: 64px 0; }
.section-alt { background: var(--color-bg-alt); }

.section-header { text-align: center; margin-bottom: 48px; }

.section-header h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--color-primary);
  margin: 0 0 12px;
}

.section-divider {
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-warm));
  margin: 0 auto 16px;
  border-radius: 2px;
}

.section-header p {
  color: var(--color-text-light);
  max-width: 700px;
  margin: 0 auto;
}

/* Feature Grid */
.feature-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}

.feature-card {
  flex: 1 1 260px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: box-shadow 0.2s, transform 0.2s;
}

.feature-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-accent), var(--color-primary));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 16px;
  color: #fff;
}

.feature-card h3 {
  font-size: 1.05rem;
  color: var(--color-primary);
  margin: 0 0 10px;
  line-height: 1.35;
}

.feature-card p {
  margin: 0;
  font-size: 0.93rem;
  color: var(--color-text-light);
}

/* Travel Products Icons */
.product-icons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.product-icons li {
  flex: 0 1 120px;
  text-align: center;
  padding: 20px 12px;
  background: var(--color-bg);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  transition: transform 0.2s;
}

.product-icons li:hover { transform: translateY(-4px); box-shadow: var(--shadow); }

.product-icons .icon {
  font-size: 2rem;
  margin-bottom: 8px;
}

.product-icons .name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0;
}

/* Two-column content */
.split-section {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  align-items: center;
}

.split-section > * { flex: 1 1 300px; }

.split-content h3 {
  color: var(--color-primary);
  font-size: 1.4rem;
  margin: 0 0 16px;
}

.split-content p { color: var(--color-text-light); margin: 0 0 14px; }

.split-visual {
  background: linear-gradient(135deg, var(--color-bg-alt), #e0f0fa);
  border-radius: var(--radius);
  padding: 48px 32px;
  text-align: center;
  border: 1px solid var(--color-border);
}

.split-visual .big-icon { font-size: 4rem; }

/* Solution blocks */
.solution-block {
  padding: 48px 0;
  border-bottom: 1px solid var(--color-border);
}

.solution-block:last-child { border-bottom: none; }

.solution-block h3 {
  color: var(--color-primary);
  margin: 0 0 8px;
}

.solution-block .quote {
  font-size: 1.05rem;
  color: var(--color-text-light);
  font-style: italic;
  margin: 0;
}

/* CTA Banner */
.cta-banner {
  background: linear-gradient(135deg, var(--color-primary) 0%, #1a6cb5 100%);
  color: #fff;
  text-align: center;
  padding: 56px 20px;
}

.cta-banner h2 { margin: 0 0 12px; font-size: clamp(1.3rem, 3vw, 1.8rem); }
.cta-banner p { margin: 0; opacity: 0.9; }

/* Page header (inner pages) */
.page-header {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: #fff;
  padding: 48px 0;
  text-align: center;
}

.page-header h1 {
  margin: 0;
  font-size: clamp(1.5rem, 3.5vw, 2.2rem);
  font-weight: 700;
}

.page-content { padding: 48px 0 64px; }

.page-content h2 {
  color: var(--color-primary);
  font-size: 1.3rem;
  margin: 28px 0 12px;
}

.page-content p { color: var(--color-text-light); margin: 0 0 14px; }

.page-content ul {
  color: var(--color-text-light);
  margin: 0 0 16px;
  padding-left: 24px;
}

.page-content li { margin-bottom: 6px; }

/* Blog */
.blog-container { padding: 0; }

.blog-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
}

.blog-card {
  flex: 1 1 300px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  transition: box-shadow 0.2s;
}

.blog-card:hover { box-shadow: var(--shadow); }

.blog-title { margin: 0 0 12px; font-size: 1.1rem; }
.blog-title a { color: var(--color-primary); }
.blog-preview p { margin: 0; color: var(--color-text-light); font-size: 0.93rem; }

/* Footer */
.site-footer { background: var(--color-primary-dark); color: rgba(255,255,255,0.85); }

.footer-main { padding: 48px 0 32px; }

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
}

.footer-col { flex: 1 1 200px; }

.footer-col h4 {
  color: #fff;
  margin: 0 0 16px;
  font-size: 1rem;
}

.footer-col p {
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0;
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links li { margin-bottom: 8px; }

.footer-links a {
  color: rgba(255,255,255,0.75);
  font-size: 0.9rem;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.12);
  padding: 20px 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  font-size: 0.85rem;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.social-links a {
  color: rgba(255,255,255,0.7);
  font-size: 0.85rem;
  padding: 4px 8px;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 4px;
}

.social-links a:hover { color: #fff; border-color: var(--color-accent-light); }

/* Back to top */
#toTop {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  box-shadow: var(--shadow);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
  z-index: 999;
}

#toTop.visible { opacity: 1; pointer-events: auto; }

/* Responsive */
@media (max-width: 900px) {
  .nav-toggle { display: block; }

  .main-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    box-shadow: var(--shadow);
    display: none;
    padding: 12px 0;
  }

  .main-nav.open { display: block; }

  .nav-list { flex-direction: column; align-items: stretch; }

  .nav-list > li > a { padding: 12px 20px; }

  .nav-list .submenu {
    position: static;
    box-shadow: none;
    border: none;
    border-left: 3px solid var(--color-accent);
    margin-left: 20px;
    padding: 0;
    display: none;
  }

  .nav-list > li.submenu-open > .submenu { display: block; }

  .hero-slides { min-height: 320px; }
  .hero-slide { padding: 48px 0; }
}