/* ===========================================================
   Base — Reset & element defaults
   =========================================================== */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-300);
  line-height: var(--lh-body);
  letter-spacing: var(--ls-tight);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, picture, video, canvas, svg {
  max-width: 100%;
  height: auto;
  display: block;
}

img { border-radius: var(--radius-md); }

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease);
}

ul, ol { list-style: none; margin: 0; padding: 0; }
button { font: inherit; cursor: pointer; }

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  line-height: var(--lh-snug);
  letter-spacing: var(--ls-snug);
  font-weight: 700;
}

p { margin: 0; }

iframe { border: 0; display: block; }

/* details/summary 基本リセット */
summary { list-style: none; cursor: pointer; }
summary::-webkit-details-marker { display: none; }
summary::marker { content: ""; }