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

body, html {
    height: 100%;
    font-family: 'Arial', sans-serif;
    color: white;
    background-color: #111;
    overflow: hidden;
}

/* Particle background */
#particles-js {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

/* Header */
header {
    padding: 80px 20px;
    text-align: center;
    position: relative;
    animation: fadeIn 2s ease-in-out;
}

@keyframes fadeIn {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    width: 150px;
    margin-bottom: 20px;
    animation: logoAnimation 3s ease-in-out infinite alternate;
}

@keyframes logoAnimation {
    0% { transform: scale(1); opacity: 0.8; }
    100% { transform: scale(1.1); opacity: 1; }
}

.main-title {
    font-size: 3.5rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-top: 20px;
    opacity: 0;
    animation: fadeInTitle 2s forwards;
    text-shadow: 0px 0px 30px rgba(255, 255, 255, 0.7);
}

@keyframes fadeInTitle {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

.description {
    font-size: 1.2rem;
    margin-top: 15px;
    max-width: 800px;
    margin: 15px auto;
    line-height: 1.5;
    opacity: 0;
    animation: fadeInText 2.5s forwards;
    text-shadow: 0px 0px 20px rgba(255, 255, 255, 0.6);
}

@keyframes fadeInText {
    0% { opacity: 0; }
    100% { opacity: 1; }
}

.download-btn {
    margin-top: 30px;
    padding: 15px 40px;
    background-color: #fff;
    color: #111;
    font-size: 1.2rem;
    text-decoration: none;
    border-radius: 50px;
    transition: transform 0.3s, background-color 0.3s, box-shadow 0.3s;
    font-weight: bold;
    box-shadow: 0px 0px 10px rgba(255, 255, 255, 0.7);
}

.download-btn:hover {
    transform: scale(1.1);
    background-color: #444;
    color: white;
    box-shadow: 0px 0px 20px rgba(255, 255, 255, 0.9);
}

.features {
    max-width: 1000px;
    margin: 80px auto;
    text-align: center;
    padding: 20px;
}

.features-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 40px;
    text-transform: uppercase;
    opacity: 0;
    animation: fadeInTitle 2s forwards;
}

.feature-container {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 20px;
}

.feature-item {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
    flex: 1 1 300px;
    transition: all 0.3s ease, transform 0.3s;
}

.feature-item:hover {
    transform: translateY(-10px) scale(1.05);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.7);
}

.feature-item h3 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    text-transform: uppercase;
    color: #f9f9f9;
}

.feature-item p {
    font-size: 1.1rem;
    line-height: 1.6;
}

footer {
    background-color: #111;
    color: white;
    text-align: center;
    padding: 20px;
    font-size: 1rem;
    margin-top: 50px;
}

footer p {
    font-weight: bold;
}

/* Interactive hover effects on features */
.feature-item:hover {
    cursor: pointer;
    transform: scale(1.05) translateY(-10px);
    background-color: rgba(255, 255, 255, 0.15);
}

.feature-item h3 {
    animation: textGlow 1s ease-in-out infinite alternate;
}

@keyframes textGlow {
    0% { text-shadow: 0px 0px 10px rgba(255, 255, 255, 0.4); }
    100% { text-shadow: 0px 0px 20px rgba(255, 255, 255, 1); }
}