*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; }
body {
  /* iOS Safari の URL バー伸縮に追従させるため dvh を優先。dvh 未対応の
     ブラウザは 100vh が有効になる。 */
  min-height: 100vh;
  min-height: 100dvh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  background-color: var(--sf-bg-primary);
  color: var(--sf-text-primary);
  overscroll-behavior-y: none;
}
img, picture, video, canvas, svg { display: block; max-width: 100%; }
input, button, textarea, select { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
p, h1, h2, h3, h4, h5, h6 { overflow-wrap: break-word; margin: 0; }
ul, ol { list-style: none; padding: 0; margin: 0; }

/* ─── Global thin scrollbar ─── */
* {
  scrollbar-width: thin;
  scrollbar-color: transparent transparent;
}
*:hover {
  scrollbar-color: var(--sf-button-border-primary) transparent;
}
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: transparent; border-radius: 4px; }
*:hover::-webkit-scrollbar-thumb { background-color: var(--sf-button-border-primary); }