/* 基础：重置、排版、可访问性默认值 */

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

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  font-variant-numeric: tabular-nums;
}

h1, h2, h3, h4 {
  margin: 0;
  line-height: 1.25;
  font-weight: 650;
  letter-spacing: -0.01em;
}

p { margin: 0 0 var(--space-3); }
p:last-child { margin-bottom: 0; }

a {
  color: var(--accent-2);
  text-decoration-color: color-mix(in oklch, var(--accent-2) 40%, transparent);
  text-underline-offset: 3px;
  transition: color var(--duration-fast) var(--ease-out);
}
a:hover { color: var(--accent); }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

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

code, .mono {
  font-family: var(--font-mono);
  font-size: 0.92em;
}

hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: var(--space-5) 0;
}

::selection {
  background: color-mix(in oklch, var(--accent) 35%, transparent);
  color: var(--text);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* 滚动条：与表面层次一致，避免默认亮条打断深色界面 */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-thumb {
  background: var(--line-strong);
  border: 3px solid transparent;
  background-clip: content-box;
  border-radius: 99px;
}
*::-webkit-scrollbar-track { background: transparent; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}