/* General Styles */
:root {
  --primary-color: #1A2B4C;
  --secondary-color: #FFD700;
  --text-light: #f0f0f0;
  --text-dark: #333;
  --shadow-light: rgba(0, 0, 0, 0.1);
  --shadow-strong: rgba(0, 0, 0, 0.25);
}

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

body {
  font-family: 'Arial', sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  padding-top: 120px; /* Adjust based on header height, especially for mobile */
}

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

/* Header Styles */
.site-header {
  position: fixed;
  top: 0;
  width: 100%;
  min-height: 60px; /* Minimum height, content adapts */
  background-color: var(--primary-color);
  color: var(--text-light);
  box-shadow: 0 4px 12px var(--shadow-strong);
  z-index: 1000;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 60px;
}

.logo {
  font-size: 2.2em;
  font-weight: bold;
  color: var(--secondary-color);
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 5px 0;
  flex-shrink: 0;
}

.hamburger-menu {
  display: none; /* Hidden on desktop */
  background: none;
  border: none;
  cursor: pointer;
  padding: 10px;
  position: relative;
  z-index: 1001; /* Above mobile buttons and main nav when collapsed */
}

.hamburger-menu span {
  display: block;
  width: 25px;
  height: 3px;
  background-color: var(--secondary-color);
  margin: 5px 0;
  transition: 0.4s;
}

.hamburger-menu.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

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

.hamburger-menu.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.main-nav ul {
  display: flex;
  justify-content: center;
  gap: 25px;
}

.main-nav a {
  padding: 10px 15px;
  display: block;
  font-weight: 600;
  transition: color 0.3s, background-color 0.3s;
  border-radius: 5px;
  white-space: nowrap;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--primary-color);
  background-color: var(--secondary-color);
}

.desktop-buttons {
  display: flex;
  gap: 10px;
  flex-shrink: 0;
}

.mobile-buttons {
  display: none; /* Hidden on desktop */
}

/* Button Styles */
.btn {
  display: inline-block;
  padding: 10px 20px;
  border-radius: 25px;
  font-weight: bold;
  text-align: center;
  text-decoration: none; /* Remove underline */
  transition: all 0.3s ease;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  white-space: nowrap;
  color: var(--primary-color); /* Default text color */
}

.btn-register {
  background: linear-gradient(135deg, #FFD700, #FFA500);
  color: var(--primary-color);
}
.btn-register:hover {
  background: linear-gradient(135deg, #FFA500, #FFD700);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3), 0 0 15px rgba(255, 215, 0, 0.7);
}

.btn-login {
  background: linear-gradient(135deg, #00C9FF, #92FE9D);
  color: var(--primary-color);
}
.btn-login:hover {
  background: linear-gradient(135deg, #92FE9D, #00C9FF);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3), 0 0 15px rgba(0, 201, 255, 0.7);
}

.btn-download {
  background: linear-gradient(135deg, #FF6B6B, #EE9A9A);
  color: var(--text-light);
}
.btn-download:hover {
  background: linear-gradient(135deg, #EE9A9A, #FF6B6B);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3), 0 0 15px rgba(255, 107, 107, 0.7);
}

/* Footer Styles */
.site-footer {
  background-color: var(--primary-color);
  color: var(--text-light);
  padding: 40px 20px 20px;
  margin-top: 40px; /* To give space below content */
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 30px;
}

.footer-col {
  flex: 1;
  min-width: 180px;
}

.footer-col h3 {
  font-size: 1.2em;
  margin-bottom: 15px;
  color: var(--secondary-color);
}

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

.footer-nav a {
  font-size: 0.95em;
  transition: color 0.3s;
}

.footer-nav a:hover {
  color: var(--secondary-color);
}

.footer-bottom {
  text-align: center;
  margin-top: 30px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 0.9em;
}

/* Scroll to Top Button */
#scrollToTopBtn {
  display: none; /* Hidden by default */
  position: fixed; /* Fixed position */
  bottom: 20px;
  right: 20px;
  z-index: 999; /* Below header, above most content */
  background-color: var(--secondary-color);
  color: var(--primary-color);
  border: none;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  font-size: 24px;
  line-height: 50px; /* Center text vertically */
  text-align: center;
  cursor: pointer;
  box-shadow: 0 4px 8px var(--shadow-strong);
  transition: background-color 0.3s, box-shadow 0.3s, transform 0.3s;
}

#scrollToTopBtn:hover {
  background-color: #e6c200; /* Slightly darker secondary color */
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
  transform: translateY(-2px);
}

/* Responsive Styles */
@media (min-width: 769px) {
  .main-nav {
    flex-grow: 1; /* Allows nav to take up available space */
    display: flex;
    justify-content: center; /* Center main nav items */
  }
  .header-top {
    justify-content: space-between;
  }
  .logo {
    margin-right: 20px;
  }
  body {
    padding-top: 60px; /* Adjust for desktop header height */
  }
}

@media (max-width: 768px) {
  .header-top {
    justify-content: space-between; /* Space out hamburger, logo */
    padding: 0 10px;
  }
  .logo {
    flex-grow: 1; /* Allow logo to take space */
    text-align: center; /* Center logo */
    margin: 0;
    font-size: 2em;
  }
  .desktop-buttons {
    display: none; /* Hide desktop buttons on mobile */
  }
  .hamburger-menu {
    display: block;
  }
  .main-nav {
    display: none; /* Hide main nav by default on mobile */
    position: absolute;
    top: 100%; /* Position below header-top */
    left: 0;
    width: 100%;
    background-color: var(--primary-color);
    box-shadow: 0 8px 16px var(--shadow-strong);
    z-index: 998; /* Below hamburger, above mobile buttons */
    padding-bottom: 10px;
  }
  .main-nav.active {
    display: block;
  }
  .main-nav ul {
    flex-direction: column;
    align-items: center;
    gap: 0;
  }
  .main-nav li {
    width: 100%;
    text-align: center;
  }
  .main-nav a {
    padding: 12px 20px;
    border-radius: 0;
    width: 100%;
  }
  .mobile-buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
    padding: 10px 20px;
    background-color: var(--primary-color);
    box-shadow: 0 2px 8px var(--shadow-strong);
    z-index: 999; /* Below hamburger menu, above content */
  }
  .mobile-buttons .btn {
    flex: 1;
    max-width: 120px;
    font-size: 0.9em;
    padding: 8px 15px;
  }

  .footer-container {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .footer-col {
    width: 100%;
    max-width: 300px;
  }
  .footer-col h3 {
    margin-top: 20px;
  }
  .footer-nav ul {
    padding: 0;
  }
  body {
    padding-top: 120px; /* Adjust for mobile header + buttons height */
  }
}