:root {
  --bs-font-sans-serif: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
  --primary-color: #3b82f6;
  --primary-gradient: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  --glass-bg: rgba(255, 255, 255, 0.85);
  --card-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.08);
  --card-hover-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.12);
}

body {
  font-family: var(--bs-font-sans-serif);
  color: #334155;
  background-color: #f8fafc;
}

/* Navbar */
.navbar-glass {
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(0,0,0,0.05);
  transition: all 0.3s ease;
}
.navbar-brand {
  font-weight: 700;
  letter-spacing: -0.5px;
  color: #0f172a;
}
.nav-link {
  font-weight: 500;
  color: #64748b;
  transition: color 0.2s;
  margin: 0 4px;
}
.nav-link:hover, .nav-link.active {
  color: var(--primary-color);
}

/* Dropdown */
.dropdown-menu {
  border: none;
  box-shadow: 0 10px 40px -10px rgba(0,0,0,0.1);
  border-radius: 12px;
  padding: 0.5rem;
}
.dropdown-item {
  border-radius: 8px;
  padding: 0.5rem 1rem;
  font-size: 0.95rem;
  color: #475569;
}
.dropdown-item:hover {
  background-color: #f1f5f9;
  color: var(--primary-color);
}

/* Contact Button */
.btn-contact {
  background: var(--primary-gradient);
  color: white;
  border: none;
  padding: 0.5rem 1.25rem;
  border-radius: 50px;
  font-weight: 600;
  transition: transform 0.2s;
}
.btn-contact:hover {
  transform: translateY(-2px);
  color: white;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

/* Scroll Buttons */
.scroll-btn {
  position: fixed;
  right: 20px;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  background: white;
  border: 1px solid #e2e8f0;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #334155;
  font-size: 1.2rem;
  transition: all 0.2s;
  cursor: pointer;
}
.scroll-btn:hover {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}
#scrollTopBtn { bottom: 80px; opacity: 0; pointer-events: none; }
#scrollBottomBtn { bottom: 25px; }
#scrollTopBtn.show { opacity: 1; pointer-events: auto; }

/* Section Padding */
.section-pad { padding: 5rem 0; }

/* Lists */
.list-checked li {
  margin-bottom: 0.5rem;
  display: flex;
  align-items: start;
}

/* Animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.5, 0, 0, 1);
}
.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Feature Cards */
.feature-card {
  transition: transform 0.3s ease;
}
.feature-card:hover {
  transform: translateY(-5px);
}