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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  overflow-y: scroll;
  scrollbar-gutter: stable;
}

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: #fff;
  color: #1a1a1a;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
    flex: 1;
}

a { color: #0f6fd1; text-decoration: none; }
a:hover { text-decoration: underline; }

img { display: block; max-width: 100%; }


.back-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: #111;
    color: #fff;
    padding: 10px 12px;
    border-radius: 50%;
    text-decoration: none;
    font-size: 14px;
    opacity: 0.7;
    transition: 0.2s;	
}

.back-top:hover {
    opacity: 1;
}