.bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    background: radial-gradient(circle at 50% 50%, #0d1320 0%, #070a10 100%);
}
.stars {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-image:
        radial-gradient(2px 2px at 20px 30px, #fff, transparent),
        radial-gradient(2px 2px at 60px 70px, #fff, transparent),
        radial-gradient(1px 1px at 50px 50px, #00e4ff, transparent),
        radial-gradient(2px 2px at 120px 150px, #fff, transparent),
        radial-gradient(2px 2px at 180px 90px, #0099ff, transparent);
    background-size: 250px 250px;
    animation: bgMove 20s linear infinite;
    opacity: 0.15;
}

header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(8,13,22,0.98);
    padding: 15px 4%;
    z-index: 999;
    box-shadow: 0 0 30px rgba(0,180,255,0.1);
    border-bottom: 1px solid rgba(0,228,255,0.15);
    animation: navDrop 0.7s ease;
    transition: 0.3s;
}
header.scrolled {
    padding: 10px 4%;
    background: #080d16;
}
.nav {
    max-width: 1200px;
    margin: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary);
    text-shadow: 0 0 15px rgba(0,228,255,0.4);
    animation: logoFlicker 3s infinite alternate;
}
.menu {
    display: flex;
    gap: 30px;
}
.menu a {
    color: var(--text);
    font-size: 15px;
    transition: 0.3s;
}
.menu a:hover {
    color: var(--primary);
}
.music-btn {
    padding: 6px 12px;
    background: rgba(0,228,255,0.1);
    border: 1px solid var(--primary);
    border-radius: 30px;
    color: var(--primary);
    font-size: 13px;
    transition: 0.3s;
}
.music-btn:hover {
    background: rgba(0,228,255,0.2);
}

.banner {
    margin-top: 70px;
    padding: 120px 4%;
    text-align: center;
    background: linear-gradient(135deg, #0c1424, #141b2d);
    border-bottom: 1px solid rgba(0,228,255,0.2);
    animation: bannerZoom 1.1s ease-out;
}
.banner h1 {
    font-size: 38px;
    margin-bottom: 16px;
    font-weight: 700;
    animation: titlePop 1.3s ease-out;
}
.banner h1 span {
    background-size: 200% 100%;
    animation: textShine 2.8s infinite linear;
}
.banner p {
    font-size: 17px;
    color: var(--subtext);
    max-width: 750px;
    margin: 0 auto 35px;
    animation: fadeInLTR 1.5s ease-out;
}
.banner-btns {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 14px 32px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: #000;
    font-weight: bold;
    border-radius: 50px;
    font-size: 16px;
    transition: 0.35s;
    box-shadow: 0 8px 25px rgba(0,228,255,0.25);
    animation: btnBounce 1.8s ease-out;
    position: relative;
    overflow: hidden;
}
.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: btnShine 2.5s infinite linear;
}
.btn:hover {
    transform: translateY(-4px) scale(1.04);
    box-shadow: 0 12px 35px rgba(0,228,255,0.5);
}
.btn-line {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}

footer {
    text-align: center;
    padding: 35px 20px;
    background: #080d16;
    color: var(--subtext);
    border-top: 1px solid rgba(0,228,255,0.1);
    animation: footFade 2s ease;
    font-size: 14px;
}

#backTop {
    position: fixed;
    bottom: 30px;
    right: 20px;
    width: 50px;
    height: 50px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #000;
    font-weight: bold;
    opacity: 0;
    visibility: hidden;
    transition: 0.3s;
    z-index: 99;
}
#backTop.show {
    opacity: 1;
    visibility: visible;
}