/* Universal Styles */

* {
    box-sizing: border-box;
}

html {
    font-family: "Verdana", sans-serif;
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    background-color: black;
    color: white;
    margin:0;
    line-height: 1.5;
    animation: fadeIn 0.8s ease;
}

@keyframes fadeIn {
  from {opacity: 0;}
  to {opacity: 1;}
}

.main-content {
    position: relative;
    padding-top: 1.875rem;
}

footer {
    text-align: right;
    padding: 1rem;
}

header, .media, .features, .download {
    padding: 2rem 1rem;
}


/* Header */

header {
    position: relative;
    text-align: center;
    padding: 5rem 1rem;
    overflow: hidden;
}

header::before {
    content: "";
    position: absolute;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(127,255,212,0.2), transparent 60%);
    filter: blur(80px);
    z-index: -1;
}

header h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    letter-spacing: 0.02em;
    font-weight: 400;
    max-width: 850px;
    margin: 0 auto 1.5rem;
}

.download-link {
    display: inline-block;
    color: aquamarine;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border: 1px solid aquamarine;
    padding: 0.8rem 1.6rem;
    border-radius: 999px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.download-link:hover {
    background-color: aquamarine;
    color: black;
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(127,255,212,0.35);
}

/* section 1: Introduction */

.media {
    display: flex;
    align-items: center;
    justify-content: center;
}

.media video {
    width: 100%;
    max-width: 500px;
    height: auto;
    display: block;
    border-radius: 0.75rem;
    box-shadow: 0 15px 40px rgba(0,0,0,0.4);
}

/* section 2: Features */

.features {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #121212;
    padding: 4rem 1rem;
    border-top: 1px solid #1f1f1f;
    border-bottom: 1px solid #1f1f1f;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

.title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 300;
    margin-top: 2rem;
    margin-bottom: 0.5rem;
    text-align: center;
}

.description {
    font-size: 1.3125rem;
    color: gray;
    text-align: center;
    line-height: 1.6;
    margin-top: 0;
    margin-bottom: 2rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.features img {
    width: 100%;
    max-width: 900px;
    height: auto;
    display: block;
    border-radius: 0.75rem;
    box-shadow: 0 15px 40px rgba(0,0,0,0.4);
    transition: transform 0.4s ease;
}

.features img:hover {
    transform: scale(1.05);
}

/* section 3: Contact */

.download {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding-top: 2rem;
    text-align: center;
}

.download img {
    width: 70px;
    height: auto;
    margin-bottom: 1rem;
}

.download h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 300;
    margin-bottom: 1rem;
}

.download .download-link {
    margin-top: 0.5rem;
}

/* Footer */

.copyright, #copyright-icon {
    color: gray;
}

/* Responsive Design */

@media (max-width: 768px) {

    .main-content {
        padding-top: 1rem;
    }

    header,
    .media,
    .features,
    .download {
        padding: 1.5rem 1rem;
    }

    .description {
        font-size: 1rem;
    }

    footer {
        text-align: center;
    }
}

@media (max-width: 480px) {

    .download-link {
        font-size: 0.95rem;
        padding: 0.65rem 1rem;
    }

    .download img {
        width: 60px;
    }
}