/*  Full-screen background  */
body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background: url("assets/background.jpg") no-repeat center center fixed;
    background-size: cover;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
}

/* dark fade for better text visibility */
.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.28);
    z-index: 1;
}

/* content wrapper */
.content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: white;
    animation: fadeIn 4.2s ease-out forwards;
}

/* GSM logo */
.logo {
    width: 280px;
    max-width: 70vw;
    animation: floatIn 4.8s ease-out forwards;
}

/* Text styling */
.title {
    font-size: 2.6rem;
    margin-top: 20px;
    font-weight: 700;
    text-shadow: 0 3px 6px rgba(0,0,0,0.6);
}

.subtitle {
    font-size: 1.4rem;
    margin-top: 10px;
    opacity: 0.9;
    text-shadow: 0 2px 4px rgba(0,0,0,0.6);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes floatIn {
    from { opacity: 0; transform: scale(0.85) translateY(-20px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

/* Mobile responsiveness */
@media (max-width: 600px) {
    .title { font-size: 1.9rem; }
    .subtitle { font-size: 1.1rem; }
    .logo { width: 200px; }
}