/* ===== Global Styles - Shared Across All Pages ===== */

/* Basic reset and fonts */
* {
  box-sizing: border-box;
}

body { 
  font-family: 'Arial', 'Helvetica', sans-serif; 
  margin: 0; 
  background: #fff; 
  color: #111; 
  line-height: 1.6;
}

/* ===== Header Navigation Bar Styles ===== */
header {
  background: #f8f8f8;
  padding: 0 20px;
  box-sizing: border-box;
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  height: 12vh;
  min-height: 70px;
  max-height: 120px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.logo {
  height: 80%;
  max-height: 64px;
  min-height: 40px;
  cursor: pointer;
}

/* Navigation bar links */
nav {
  display: flex;
  align-items: center;
  gap: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

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

.nav-links a {
  display: block;
  padding: 10px 18px;
  color: #111;
  text-decoration: none;
  font-size: 1.05em;
  border-radius: 6px;
  transition: all 0.3s ease;
  font-weight: 500;
}

.nav-links a:hover {
  background: #e6f7ff;
  color: #3bb3b3;
}

.nav-links a.active {
  background: #3bb3b3;
  color: #fff;
  font-weight: bold;
}

/* Hoverable dropdown menu */
.nav-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  background: #fff;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  border-radius: 8px;
  min-width: 200px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.3s ease;
  z-index: 2000;
  padding: 8px 0;
}

.nav-links > li:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-dropdown a {
  display: block;
  padding: 12px 20px;
  color: #333;
  text-decoration: none;
  font-size: 0.95em;
  font-weight: 400;
  border-radius: 0;
  transition: all 0.2s ease;
}

.nav-dropdown a:hover {
  background: #f0f8ff;
  color: #3bb3b3;
  padding-left: 24px;
}

/* ===== Main Content Area ===== */
main { 
  padding: 40px 20px; 
  padding-top: calc(12vh + 60px);
  max-width: 1200px;
  margin: 0 auto;
}

/* ===== Navigation Arrows (scroll arrows) ===== */
.nav-arrow {
  position: fixed;
  right: 3vw;
  width: 60px;
  height: 60px;
  background: #3bb3b3;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  box-shadow: 0 4px 20px rgba(0,0,0,0.20);
  cursor: pointer;
  z-index: 3000;
  transition: all 0.3s ease;
  opacity: 0.9;
}

.nav-arrow:hover {
  background: #2a9999;
  transform: scale(1.1);
  opacity: 1;
}

.arrow-down {
  bottom: 4vh;
}

.arrow-up {
  bottom: 12vh;
  display: none;
}

/* ===== Global Animations ===== */
@keyframes fadeInBanner {
  from { 
    opacity: 0; 
    transform: translateY(30px); 
  }
  to { 
    opacity: 1; 
    transform: translateY(0); 
  }
}

.scroll-animate {
  opacity: 0;
  transform: translateY(50px);
  transition: all 0.8s ease;
}

.scroll-animate.show {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Shared Page Header Style ===== */
.page-header {
  text-align: center;
  margin-bottom: 3rem;
  opacity: 0;
  animation: fadeInBanner 1.2s ease-in forwards;
}

.page-header h1 {
  font-family: 'Arial Black', Arial, sans-serif;
  font-size: clamp(2.5rem, 5vw, 4rem);
  margin-bottom: 1rem;
  color: #111;
}

.page-header p {
  font-size: 1.2em;
  color: #666;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  font-size: 1em;
  color: #fff;
  background: #3a4667;
  padding: 30px 0;
  margin-top: 4rem;
}

/* ===== Responsive Design - General ===== */
@media (max-width: 900px) {
  .nav-links {
    gap: 4px;
  }

  .nav-links a {
    padding: 8px 12px;
    font-size: 0.95em;
  }

  .nav-dropdown {
    min-width: 180px;
  }

  .nav-dropdown a {
    font-size: 0.9em;
    padding: 10px 16px;
  }

  .nav-arrow {
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
  }

  main {
    padding: 20px 15px;
    padding-top: calc(8vh + 40px);
  }

  header {
    padding: 0 12px;
    height: 8vh;
    min-height: 60px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    gap: 2px;
  }

  .nav-links a {
    padding: 6px 8px;
    font-size: 0.9em;
  }
}

@media (max-width: 600px) {
  .nav-links {
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 2px;
  }

  .nav-links a {
    padding: 5px 6px;
    font-size: 0.8em;
  }
}

@media (max-width: 480px) {
  header {
    flex-direction: column;
    height: auto;
    min-height: 80px;
    padding: 8px 12px;
    gap: 8px;
  }

  .nav-links {
    justify-content: center;
    width: 100%;
  }

  main {
    padding-top: 12vh;
  }
}

/* Large Screen Optimization */
@media (min-width: 1400px) {
  .nav-links a {
    padding: 12px 24px;
    font-size: 1.1em;
  }
}