/* ===== Base：reset + 排版 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
[hidden] { display: none !important; }

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

body {
  font-family: var(--font);
  background: var(--c-bg);
  color: var(--c-ink);
  line-height: 1.6;
  font-size: 16px;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--c-primary); text-decoration: none; }
button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
  -webkit-tap-highlight-color: transparent;
}

h1, h2, h3 { line-height: 1.25; font-weight: 800; }

.wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

@media (min-width: 768px) {
  .wrap { max-width: 720px; }
}

/* 触控目标不小于 44px */
button, a.btn { min-height: 44px; }