/* ============================================================
   基础样式与重置 (Base & Reset)
   计划分解器 · UI Designer
   ============================================================ */

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

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  /* 大块装饰色块：卡通、干净、有活力（蓝紫 + 淡粉，避开黄绿） */
  background-image:
    radial-gradient(680px 520px ellipse at 8% 12%, var(--blob-blue) 0%, transparent 60%),
    radial-gradient(600px 600px circle at 92% 8%, var(--blob-blue2) 0%, transparent 55%),
    radial-gradient(520px 420px ellipse at 88% 92%, var(--blob-violet) 0%, transparent 55%),
    radial-gradient(620px 500px ellipse at 10% 90%, var(--blob-pink) 0%, transparent 60%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, p {
  margin: 0;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
}

textarea,
input,
select {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

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

a {
  color: var(--color-primary-600);
  text-decoration: none;
}

/* 焦点可见性（卡通风格：粗实线描边） */
:focus-visible {
  outline: 3px solid var(--color-primary-400);
  outline-offset: 3px;
  border-radius: var(--radius-md);
}

/* 尊重「减少动态效果」系统偏好 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* 选区颜色 */
::selection {
  background-color: var(--color-primary-200);
  color: var(--color-text);
}

/* 滚动条（webkit） */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background-color: var(--color-border-strong);
  border-radius: var(--radius-full);
  border: 2px solid var(--color-bg);
}
::-webkit-scrollbar-thumb:hover {
  background-color: var(--color-text-subtle);
}

/* 通用视觉辅助类 */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-muted {
  color: var(--color-text-muted);
}