/*
SIA Scientific Landing Page Styles
Version: 1.0
*/

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

:root {
    --royal-blue: #2D5BFF;
    --electric-purple: #B366FF;
    --neon-green: #00FF88;
    --deep-space: #0A0E27;
    --dark-matter: #141829;
    --nebula: #1A1F3A;
    --stardust: #2C3354;
    --light-matter: #E8ECF4;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--deep-space);
    color: var(--light-matter);
    overflow-x: hidden;
    line-height: 1.6;
}

/* ================= BACKGROUND ================= */

.cosmic-bg {
    position: fixed;
    inset: 0;
    z-index: -2;
    background:
        radial-gradient(circle at 15% 25%, rgba(45, 91, 255, 0.15) 0%, transparent 45%),
        radial-gradient(circle at 85% 75%, rgba(179, 102, 255, 0.12) 0%, transparent 45%),
        radial-gradient(circle at 50% 50%, rgba(0, 255, 136, 0.08) 0%, transparent 50%);
    animation: cosmicShift 20s ease-in-out infinite;
}

@keyframes cosmicShift {
    0%, 100% { transform: scale(1) rotate(0deg); }
    50% { transform: scale(1.1) rotate(2deg); }
}

.grid-overlay {
    position: fixed;
    inset: 0;
    z-index: -1;
    background-image:
        linear-gradient(rgba(45, 91, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(45, 91, 255, 0.05) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.3;
}

/* ================= NAVBAR ================= */

nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(10, 14, 39, 0.85);
    backdrop-filter: blur(30px);
    border-bottom: 1px solid rgba(45, 91, 255, 0.2);
    z-index: 1000;
    padding: 1.2rem 5%;
    transition: 0.3s ease;
}

nav.scrolled {
    padding: 0.8rem 5%;
    background: rgba(10, 14, 39, 0.95);
}

.nav-content {
    max-width: 1600px;
    margin: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    height: 55px;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 3rem;
}

.nav-links a {
    color: var(--light-matter);
    text-decoration: none;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-size: 0.9rem;
}

.nav-cta {
    background: linear-gradient(135deg, var(--royal-blue), var(--electric-purple));
    padding: 0.7rem 2rem;
    border-radius: 5