/* ============================================================
 * base.css —— 全局重置、排版、基础元素
 * ============================================================ */

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

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

body {
  margin: 0;
  min-height: 100vh;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans GB',
    'Microsoft YaHei', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: var(--fs-md);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior-y: none;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

h1,
h2,
h3,
h4,
h5,
p,
figure,
dl,
dd {
  margin: 0;
}

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

a {
  color: var(--c-brand);
  text-decoration: none;
}

a:hover {
  text-decoration: none;
}

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

button {
  cursor: pointer;
  border: none;
  background: none;
  padding: 0;
}

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

table {
  border-collapse: collapse;
  width: 100%;
}

::selection {
  background: var(--c-brand);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--c-brand);
  outline-offset: 2px;
  border-radius: 4px;
}

/* 滚动条（PC） */
@media (pointer: fine) {
  ::-webkit-scrollbar {
    width: 10px;
    height: 10px;
  }
  ::-webkit-scrollbar-thumb {
    background: var(--c-border-strong);
    border-radius: var(--r-pill);
    border: 3px solid transparent;
    background-clip: content-box;
  }
  ::-webkit-scrollbar-track {
    background: transparent;
  }
}

/* ---------- 工具类 ---------- */
.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;
}

.mono {
  font-variant-numeric: tabular-nums;
  font-feature-settings: 'tnum';
}

.text-2 {
  color: var(--c-text-2);
}

.text-3 {
  color: var(--c-text-3);
}

.text-sm {
  font-size: var(--fs-sm);
}

.text-xs {
  font-size: var(--fs-xs);
}

.nowrap {
  white-space: nowrap;
}

.row {
  display: flex;
  align-items: center;
  gap: var(--sp-2);
}

.row-wrap {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--sp-2);
}

.grow {
  flex: 1;
  min-width: 0;
}

.hidden {
  display: none !important;
}

.pos-up {
  color: var(--c-success);
}

.pos-down {
  color: var(--c-danger);
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}