/**
 * 提提图 POD 工作站 · 基础重置 v2.0
 */

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-size-adjust: 100%;
  color-scheme: dark;
  scroll-behavior: smooth;
}

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

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  color: var(--text-primary);
}

p { color: var(--text-secondary); }

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--trans-fast);
}

a:hover { color: var(--text-primary); }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
  transition: all var(--trans-fast);
  touch-action: manipulation;
}

button:disabled { cursor: not-allowed; opacity: 0.45; }
button:active:not(:disabled) { transform: translateY(1px); }

input, select, textarea {
  font: inherit;
  color: var(--text-primary);
  background: transparent;
  border: none;
  outline: none;
}

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

ul, ol { list-style: none; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

/* 焦点环：只在键盘导航时显示 */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* 屏幕阅读器专用 */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* 滚动条样式（深色主题） */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover { background: var(--border-strong); }