* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }

/* Header */
.header {
  position: fixed;
  width: 100%;
  top: 0;
  background: #ffffff;
  border-bottom: 1px solid #e5e7eb;
  z-index: 100;
}

.nav {
  max-width: 1200px;
  margin: 0 auto;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
}

/* Logo */
.logo img { height: 40px; display: block; }

/* Desktop Links */
.nav-links { list-style: none; display: flex; align-items: center; gap: 8px; }
.nav-links li a {
  padding: 10px 16px;
  font-weight: 600;
  color: #374151;
  text-decoration: none;
  border-radius: 8px;
  transition: 0.2s;
}
.nav-links li a:hover { background: #f3f4f6; color: #2563eb; }

/* Download Button Style */
.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: #2563eb;
  color: #fff !important;
  border-radius: 50px;
  font-weight: 700;
  text-decoration: none;
  transition: background 0.2s, transform 0.2s;
}
.download-btn:hover { background: #1d4ed8; transform: scale(1.05); }
.download-btn:active { transform: scale(0.95); }
.icon { width: 18px; height: 18px; }

/* Mobile Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 21px;
  background: transparent;
  border: none;
  cursor: pointer;
}
.bar { width: 100%; height: 3px; background: #1f2937; border-radius: 10px; transition: 0.3s; }

/* Mobile Menu */
.mobile-menu {
  display: none;
  background: #ffffff;
  border-top: 1px solid #f3f4f6;
}
.mobile-menu.show { display: block; }
.mobile-menu ul { list-style: none; padding: 20px; }
.mobile-menu li a {
  display: block;
  padding: 15px;
  font-weight: 600;
  color: #1f2937;
  text-decoration: none;
  border-bottom: 1px solid #f9fafb;
}
.download-btn.mobile {
  margin-top: 15px;
  text-align: center;
  display: flex;
  justify-content: center;
}

/* Responsive Logic */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .menu-toggle { display: flex; }
}