html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', sans-serif;
    background-color: #010409;
    color: #c9d1d9;
    overflow-x: hidden;
}
body::-webkit-scrollbar { width: 8px; }
body::-webkit-scrollbar-track { background: #010409; }
body::-webkit-scrollbar-thumb { background: linear-gradient(45deg, #ef4444, #3b82f6); border-radius: 10px; }

#interactive-background {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -1;
}

.navbar-premium {
    background: rgba(1, 4, 9, 0.7);
    backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.nav-link-premium {
    position: relative;
    transition: color 0.3s;
}
.nav-link-premium::after {
    content: ''; position: absolute; width: 0; height: 2px; bottom: -6px; left: 0;
    background: linear-gradient(90deg, #ef4444, #3b82f6);
    transition: width 0.3s ease;
}
.nav-link-premium:hover::after { width: 100%; }

.hero-title-gradient {
    background: -webkit-linear-gradient(45deg, #f87171, #60a5fa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.btn-glow {
    position: relative; overflow: hidden;
    background: linear-gradient(90deg, #3b82f6, #ef4444);
    transition: all 0.3s ease;
    box-shadow: 0 4px 30px rgba(59, 130, 246, 0.3), 0 4px 30px rgba(239, 68, 68, 0.2);
}
.btn-glow:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 8px 40px rgba(59, 130, 246, 0.4), 0 8px 40px rgba(239, 68, 68, 0.3);
}

.feature-card-advanced {
    background: #0d1117; border: 1px solid #21262d;
    position: relative; overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
.feature-card-advanced:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(0,0,0,0.3);
    border-color: #3b82f6;
}

.modal-advanced {
    background: rgba(13, 17, 23, 0.9);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border: 1px solid #30363d;
}

.fade-in-up { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease-out, transform 0.6s ease-out; }
.fade-in-up.is-visible { opacity: 1; transform: translateY(0); }