/* ============================================================
   基础样式重置与全局排版 (Base Reset & Global Typography)
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

[v-cloak] { display: none !important; }

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background: var(--bg-body);
  background-attachment: fixed;
  padding: var(--space-5);
}

/* ── 滚动条美化 ── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.3);
  border-radius: var(--border-radius-full);
}
::-webkit-scrollbar-thumb:hover { background: rgba(148, 163, 184, 0.5); }

/* ── 暗色模式滚动条 ── */
[data-theme="dark"] ::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.2);
}
[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
  background: rgba(148, 163, 184, 0.35);
}

/* ── 选中文本样式 ── */
::selection {
  background: var(--color-primary-200);
  color: var(--color-primary-700);
}

/* ── 聚焦可见 (Accessibility) ── */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--border-radius-xs);
}

/* ── 无障碍跳过链接 ── */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  background: var(--color-primary);
  color: var(--text-inverse);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  z-index: var(--z-toast);
  text-decoration: none;
  transition: top var(--duration-fast) var(--ease-default);
}
.skip-link:focus { top: var(--space-4); }

/* ── 应用容器 ── */
#app {
  max-width: var(--container-max);
  margin: 0 auto;
}

/* ── 通用按钮重置 ── */
button { font-family: inherit; cursor: pointer; }

/* ── 图片响应式 ── */
img { max-width: 100%; height: auto; display: block; }

/* ── 动画偏好 ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}