* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    background:
        radial-gradient(circle at 15% 20%, rgba(0, 190, 255, 0.10), transparent 35%),
        radial-gradient(circle at 85% 30%, rgba(255, 0, 200, 0.10), transparent 35%),
        #05070d;
    color: #e9edf5;
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.65;
}

.page {
    width: min(1200px, calc(100% - 32px));
    margin: 0 auto;
}

.hero {
    margin-top: 24px;
    border: 1px solid rgba(0, 210, 255, 0.35);
    border-radius: 14px;
    overflow: hidden;
    background: #02040a;
    box-shadow:
        0 0 30px rgba(0, 190, 255, 0.12),
        0 0 45px rgba(255, 0, 200, 0.08);
}

.hero img {
    display: block;
    width: 100%;
    height: auto;
}

.navigation {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin: 22px 0 30px;
    padding: 14px 20px;
    border-top: 1px solid rgba(0, 210, 255, 0.25);
    border-bottom: 1px solid rgba(255, 0, 200, 0.25);
}

.navigation a {
    text-decoration: none;
}

.nav-button {
    min-width: 170px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 11px 20px;
    color: #f4f7ff;
    font-weight: 600;
    letter-spacing: 0.04em;
    background:
        linear-gradient(
            135deg,
            rgba(0, 210, 255, 0.10),
            rgba(255, 0, 200, 0.08)
        );
    border: 1px solid rgba(0, 210, 255, 0.35);
    border-radius: 9px;
    box-shadow:
        inset 0 0 15px rgba(255, 255, 255, 0.02),
        0 4px 14px rgba(0, 0, 0, 0.25);
    transition:
        transform 0.18s ease,
        border-color 0.18s ease,
        box-shadow 0.18s ease,
        color 0.18s ease;
}

.nav-button:hover {
    color: #ffffff;
    transform: translateY(-2px);
    border-color: rgba(72, 220, 255, 0.85);
    box-shadow:
        0 0 15px rgba(0, 210, 255, 0.22),
        0 0 24px rgba(255, 0, 200, 0.10);
}

.nav-icon {
    font-size: 1.25rem;
    color: #59ddff;
}

.youtube-icon {
    width: 25px;
    height: 25px;
    fill: #ff1744;
}

.youtube-play {
    fill: #ffffff;
}

.youtube-button:hover .youtube-icon {
    filter: drop-shadow(0 0 6px rgba(255, 23, 68, 0.7));
}

.content {
    max-width: 900px;
    margin: 0 auto 50px;
    padding: 34px 42px;
    background: rgba(9, 13, 24, 0.92);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 14px;
    box-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

.content-header {
    position: relative;
    min-height: 150px;
    margin-bottom: 28px;
    padding-bottom: 22px;
    border-bottom: 1px solid rgba(0, 210, 255, 0.25);
}

.content-header > img {
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 100px;
    height: 100px;
    object-fit: contain;
}

.welcome-text {
    width: 100%;
    text-align: center;
}

.welcome-text h1 {
    margin: 0;
    font-size: clamp(2rem, 5vw, 3rem);
    line-height: 1.1;
    text-align: center;
    background: linear-gradient(90deg, #39d8ff, #ffffff 52%, #ff4bd8);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.welcome-text .subtitle {
    margin: 8px 0 0;
    color: #aeb7c8;
    text-align: center;
}

h2 {
    margin-top: 34px;
    color: #62ddff;
    font-size: 1.25rem;
}

a {
    color: #5edfff;
}

a:hover {
    color: #ff70df;
}

.footer {
    margin: 0 auto;
    padding: 0 20px 32px;
    text-align: center;
    color: #7f899b;
    font-size: 0.9rem;
}

.footer a {
    color: #aab3c3;
    text-decoration: none;
}

.footer a:hover {
    color: #ffffff;
}

@media (max-width: 650px) {
    .page {
        width: min(100% - 18px, 1200px);
    }

    .hero {
        margin-top: 10px;
        border-radius: 9px;
    }

    .navigation {
        padding-left: 0;
        padding-right: 0;
    }

    .nav-button {
        min-width: 0;
        flex: 1 1 100%;
    }

    .content {
        padding: 25px 20px;
    }

    .content-header {
        min-height: 0;
        text-align: center;
    }

    .content-header > img {
        position: static;
        transform: none;
        width: 72px;
        height: 72px;
        margin-bottom: 14px;
    }

    .welcome-text {
        width: 100%;
    }

    .welcome-text h1 {
        font-size: clamp(1.8rem, 9vw, 2.5rem);
    }
}