.site-header {
    background: #0a0a0a;
    padding: 0 40px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid #262626;
    position: sticky;
    top: 0;
    z-index: 100;
}
.site-logo {
    color: #fff;
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 0.5px;
    text-decoration: none;
}
.site-logo:hover { opacity: 0.85; }

.site-nav {
    display: flex;
    align-items: center;
    gap: 24px;
}
.site-nav a {
    color: #a3a3a3;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}
.site-nav a:hover { color: #fff; }

.site-btn {
    padding: 8px 20px;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
    border: none;
}
.site-btn-outline {
    border: 1.5px solid #525252;
    color: #fff;
    background: transparent;
}
.site-btn-outline:hover {
    border-color: #fff;
    background: rgba(255,255,255,0.05);
}

.site-back {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #a3a3a3;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s;
}
.site-back:hover { color: #fff; }
.site-back svg { width: 18px; height: 18px; }

@media (max-width: 640px) {
    .site-header { padding: 0 16px; }
    .site-nav { gap: 12px; }
    .site-nav a { font-size: 13px; }
}