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

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, sans-serif;
    background: #07111f;
    color: #f5f7fa;
    line-height: 1.6;
}

header {
    width: 100%;
    padding: 24px 8%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #1c2b3d;
}

.logo {
    font-size: 24px;
    font-weight: 800;
}

.logo span,
.hero h1 span {
    color: #20c997;
}

nav {
    display: flex;
    gap: 28px;
}

nav a {
    color: #b9c5d3;
    text-decoration: none;
}

nav a:hover {
    color: #20c997;
}

.hero {
    min-height: 650px;
    padding: 80px 8%;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    gap: 60px;
}

.badge,
.section-label {
    color: #20c997;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 2px;
}

.hero h1 {
    margin: 18px 0;
    font-size: clamp(48px, 7vw, 86px);
    line-height: 0.98;
}

.description {
    max-width: 560px;
    color: #aebdcd;
    font-size: 20px;
    margin-bottom: 32px;
}

.buttons {
    display: flex;
    gap: 14px;
}

.btn,
.project button {
    padding: 13px 22px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 700;
    border: 0;
    cursor: pointer;
}

.primary,
.project button {
    background: #20c997;
    color: #07111f;
}

.secondary {
    border: 1px solid #405269;
    color: white;
}

.hero-card {
    padding: 32px;
    border: 1px solid #263a51;
    border-radius: 24px;
    background: #0c1b2c;
    box-shadow: 0 25px 70px rgba(0, 0, 0, 0.3);
}

.card-top {
    display: flex;
    justify-content: space-between;
    color: #20c997;
    font-size: 13px;
    font-weight: bold;
}

.network {
    height: 280px;
    position: relative;
    margin: 20px 0;
}

.node {
    position: absolute;
    width: 70px;
    height: 70px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: #14283e;
    border: 1px solid #20c997;
}

.center {
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    background: #20c997;
    color: #07111f;
    font-weight: bold;
}

.node-1 {
    left: 10%;
    top: 15%;
}

.node-2 {
    right: 8%;
    top: 20%;
}

.node-3 {
    left: 42%;
    bottom: 5%;
}

.hero-card p {
    color: #8fa2b7;
}

.section {
    padding: 90px 8%;
    background: #0a1727;
}

.section h2,
.about h2,
.project h2 {
    max-width: 700px;
    font-size: 42px;
    line-height: 1.1;
    margin: 14px 0 40px;
}

.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.features article {
    padding: 30px;
    border: 1px solid #263a51;
    border-radius: 16px;
    background: #0d1e31;
}

.icon {
    font-size: 30px;
    margin-bottom: 20px;
}

.features h3 {
    margin-bottom: 10px;
}

.features p,
.about > p,
.project-box > p {
    color: #9eb0c4;
}

.about {
    padding: 90px 8%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 70px;
    align-items: center;
}

.project {
    padding: 40px 8% 100px;
}

.project-box {
    padding: 50px;
    border-radius: 22px;
    background: #10263a;
    border: 1px solid #29435d;
}

.project button {
    margin-top: 24px;
}

#message {
    margin-top: 18px;
    color: #20c997;
}

footer {
    padding: 30px 8%;
    border-top: 1px solid #1c2b3d;
    color: #73869b;
}

@media (max-width: 800px) {
    nav {
        display: none;
    }

    .hero,
    .about {
        grid-template-columns: 1fr;
    }

    .features {
        grid-template-columns: 1fr;
    }

    .hero {
        padding-top: 50px;
    }
}