/* Navigation Styles - Reference Design System */
.navbar {
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

[data-theme="dark"] .navbar {
  background: rgba(17, 24, 19, 0.95);
  border-bottom-color: var(--surface-hover);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 15px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: relative;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-dark);
  font-weight: bold;
  font-size: 1.2rem;
  transition: all 0.3s ease;
}

.logo:hover {
  transform: scale(1.05);
}

.logo-dollar {
  color: var(--primary);
  font-size: 1.8rem;
  font-weight: 600;
}

.logo-text {
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-dark);
}

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 5px;
  gap: 5px;
  z-index: 1001;
}

.mobile-menu-toggle span {
  width: 25px;
  height: 3px;
  background: var(--text-dark);
  transition: all 0.3s ease;
  border-radius: 2px;
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -7px);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 25px;
  align-items: center;
}

.nav-link {
  color: var(--text-dark);
  text-decoration: none;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 8px 15px;
  position: relative;
  transition: all 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary);
  background: rgba(19, 236, 91, 0.1);
  border-radius: 0.5rem;
}

[data-theme="dark"] .nav-link:hover,
[data-theme="dark"] .nav-link.active {
  color: var(--primary);
  background: rgba(19, 236, 91, 0.15);
}

/* Login as Button */
.nav-link[href="login.html"],
.nav-link[href*="login"] {
  background: var(--primary);
  color: var(--text-main);
  border-radius: 0.5rem;
  padding: 10px 20px;
  font-weight: 700;
  margin-left: 10px;
  box-shadow: var(--shadow-soft);
}

.nav-link[href="login.html"]:hover,
.nav-link[href*="login"]:hover,
.nav-link[href="login.html"].active,
.nav-link[href*="login"].active {
  background: var(--primary-hover);
  box-shadow: 0 10px 15px -3px rgba(19, 236, 91, 0.2);
  transform: translateY(-1px);
  color: var(--text-main);
}

/* Download PDF as Button */
.nav-link[href*="bitcoin.org"] {
  background: var(--blue-accent);
  color: var(--white);
  border-radius: 6px;
  padding: 10px 20px;
  font-weight: 600;
  margin-left: 10px;
}

.nav-link[href*="bitcoin.org"]:hover {
  background: #007acc;
  color: var(--white);
}

/* Main Content */
.main-content {
  min-height: calc(100vh - 200px);
  position: relative;
  z-index: 1;
}

/* Footer */
.footer {
  background: var(--bg-light-alt);
  border-top: 1px solid var(--border-color);
  padding: 30px 20px;
  margin-top: 80px;
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.footer-container p {
  margin: 10px 0;
  color: var(--text-gray);
}

.footer-url {
  color: var(--green-bright) !important;
  font-weight: bold;
  text-shadow: 0 0 10px var(--green-bright);
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: flex;
  }

  .nav-container {
    flex-wrap: wrap;
  }

  .logo {
    font-size: 0.9rem;
    flex: 1;
  }

  .logo-text {
    display: none;
  }

  .logo-dollar {
    font-size: 1.5rem;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.98);
    flex-direction: column;
    width: 100%;
    padding: 20px;
    gap: 0;
    border-top: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    animation: slideDown 0.3s ease;
    transition: background-color 0.3s ease;
  }

  [data-theme="dark"] .nav-menu {
    background: rgba(17, 24, 19, 0.98);
    border-top-color: var(--surface-hover);
  }

  .nav-menu.mobile-open {
    display: flex;
  }

  .nav-menu li {
    width: 100%;
    border-bottom: 1px solid var(--border-color);
  }

  .nav-menu li:last-child {
    border-bottom: none;
  }

  .nav-link {
    display: block;
    width: 100%;
    padding: 15px 20px;
    text-align: left;
    font-size: 1rem;
  }

  .nav-link::after {
    display: none;
  }

  .nav-link:hover,
  .nav-link.active {
    background: rgba(19, 236, 91, 0.1);
    padding-left: 25px;
    color: var(--primary);
  }

  [data-theme="dark"] .nav-link:hover,
  [data-theme="dark"] .nav-link.active {
    background: rgba(19, 236, 91, 0.15);
    color: var(--primary);
  }

  /* Login button on mobile */
  .nav-link[href="login.html"],
  .nav-link[href*="login"] {
    margin-left: 0;
    text-align: center;
  }

  /* Download PDF button on mobile */
  .nav-link[href*="bitcoin.org"] {
    margin-left: 0;
    text-align: center;
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Tablet Responsive */
@media (max-width: 1024px) and (min-width: 769px) {
  .nav-menu {
    gap: 20px;
  }

  .nav-link {
    font-size: 0.9rem;
    padding: 8px 12px;
  }

  .logo-text {
    font-size: 0.9rem;
  }
}

/* Theme Switcher Button */
.theme-switcher-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all 0.3s ease;
  color: var(--text-dark);
  margin-left: 10px;
  padding: 0;
}

.theme-switcher-btn:hover {
  background: var(--background-light);
  border-color: var(--primary);
  color: var(--primary);
  transform: scale(1.05);
}

[data-theme="dark"] .theme-switcher-btn:hover {
  background: var(--surface-hover);
  border-color: var(--primary);
  color: var(--primary);
}

.theme-switcher-btn .theme-icon {
  font-size: 20px;
  transition: transform 0.3s ease;
}

.theme-switcher-btn:hover .theme-icon {
  transform: rotate(15deg);
}

[data-theme="dark"] .theme-switcher-btn {
  border-color: var(--border-color);
  color: var(--text-dark);
}


/* Small Mobile */
@media (max-width: 480px) {
  .nav-container {
    padding: 12px 15px;
  }

  .logo {
    font-size: 0.8rem;
  }

  .logo-dollar {
    font-size: 1.3rem;
  }

  .nav-menu {
    padding: 15px;
  }

  .nav-link {
    font-size: 0.95rem;
    padding: 12px 15px;
  }

  .theme-switcher-btn {
    width: 35px;
    height: 35px;
    margin-left: 8px;
  }

  .theme-switcher-btn .theme-icon {
    font-size: 18px;
  }
}