/* ============================================================
 * base.css — reset 与基础排版
 * 依赖 tokens.css
 * ============================================================ */

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

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

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: 1.65;
  color: var(--color-ink);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.25;
  color: var(--color-ink);
  font-weight: 700;
}

p {
  margin: 0;
}

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

a {
  color: var(--color-primary-strong);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover,
a:focus-visible {
  color: var(--color-primary-deep);
  text-decoration: underline;
}

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

button {
  cursor: pointer;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

fieldset {
  margin: 0;
  padding: 0;
  border: 0;
  min-width: 0;
}

legend {
  padding: 0;
}

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

::selection {
  background: var(--color-primary);
  color: var(--color-on-primary);
}

.noscript-tip {
  margin: 0;
  padding: var(--space-3) var(--space-4);
  background: var(--color-danger-soft);
  color: var(--color-danger);
  font-size: var(--fs-sm);
  text-align: center;
}