/* Music Theory Playground 基础层：重置 + 排版默认值。不写任何组件样式。 */

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink-1);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: var(--lh-tight);
  margin: 0 0 var(--sp-3);
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

p { margin: 0 0 var(--sp-4); max-width: var(--measure); }

a { color: var(--green-deep); text-underline-offset: 3px; }
a:hover { color: var(--ink-1); }

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

button, input, select, textarea { font: inherit; color: inherit; }

hr { border: 0; border-top: 1px solid var(--line); margin: var(--sp-6) 0; }

code, kbd, samp { font-family: var(--font-mono); font-size: .9em; }

:focus-visible { outline: 2px solid var(--amber-deep); outline-offset: 2px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    scroll-behavior: auto !important;
  }
}