/* ==========================================================================
   棱镜网关 · 设计令牌与基础样式
   所有颜色、圆角、阴影都来自这里的变量；浅色 / 深色只切换变量。
   ========================================================================== */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI Variable Text", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans SC", "Noto Sans CJK SC", "Source Han Sans SC", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", "JetBrains Mono", Consolas, "Liberation Mono", Menlo, monospace;

  --fs-xs: 14px;
  --fs-sm: 14px;
  --fs-md: 16px;
  --fs-lg: 16px;
  --fs-xl: 20px;
  --fs-2xl: 26px;

  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --ease: cubic-bezier(.2, .7, .2, 1);
  --sidebar-w: 248px;
  --topbar-h: 60px;
  --page-max: 1360px;

  --brand-gradient: linear-gradient(135deg, #5b5ff7 0%, #8b5cf6 55%, #ec4899 100%);
}

:root,
html[data-theme="light"] {
  color-scheme: light;
  --bg: #f5f6fa;
  --surface: #ffffff;
  --surface-2: #f6f7fb;
  --surface-3: #eceef5;
  --line: #e5e8f0;
  --line-strong: #d3d8e5;
  --text: #11142b;
  --text-2: #465069;
  --text-3: #606b82;

  --accent: #5457f5;
  --accent-hover: #4347e8;
  --accent-soft: #eef0ff;
  --accent-line: #cbcffc;
  --accent-text: #4348e6;
  --on-accent: #ffffff;

  --ok: #087c4d;
  --ok-soft: #e3f6ed;
  --ok-line: #b5e5cd;
  --warn: #925700;
  --warn-soft: #fff3da;
  --warn-line: #f2d79c;
  --bad: #d62a44;
  --bad-soft: #fdebee;
  --bad-line: #f5bfc8;
  --info: #1a74e8;
  --info-soft: #e8f1ff;
  --info-line: #bcd6fb;

  --chart-1: #5b5ff7;
  --chart-2: #c4c7fb;
  --shadow-sm: 0 1px 2px rgba(17, 20, 43, .05);
  --shadow-md: 0 6px 20px rgba(17, 20, 43, .09);
  --shadow-lg: 0 24px 60px rgba(17, 20, 43, .22);
  --scrim: rgba(12, 14, 32, .46);
  --code-bg: #0f1224;
  --code-fg: #e7e9f6;
  --code-line: #262b46;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b0d18;
  --surface: #121527;
  --surface-2: #171b30;
  --surface-3: #1f2440;
  --line: #242946;
  --line-strong: #323963;
  --text: #e9ecf8;
  --text-2: #a9b0cc;
  --text-3: #9ba6c2;

  --accent: #7b7fff;
  --accent-hover: #9195ff;
  --accent-soft: #1d2145;
  --accent-line: #3a4088;
  --accent-text: #a5a8ff;
  --on-accent: #0b0d18;

  --ok: #3ccd8d;
  --ok-soft: #12302a;
  --ok-line: #1f5a46;
  --warn: #f0b04a;
  --warn-soft: #33270f;
  --warn-line: #664a17;
  --bad: #ff6f86;
  --bad-soft: #381820;
  --bad-line: #6e2b3a;
  --info: #62a4ff;
  --info-soft: #14243f;
  --info-line: #274a7c;

  --chart-1: #8084ff;
  --chart-2: #3a3f77;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, .35);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, .45);
  --shadow-lg: 0 28px 70px rgba(0, 0, 0, .6);
  --scrim: rgba(3, 4, 12, .62);
  --code-bg: #0a0c19;
  --code-fg: #e7e9f6;
  --code-line: #252a49;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: calc(var(--topbar-h) + 16px);
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
  font: 400 var(--fs-md)/1.6 var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}

[hidden] { display: none !important; }

h1, h2, h3, h4, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
h1, h2, h3, h4 { font-weight: 650; letter-spacing: -.01em; line-height: 1.3; }

a { color: var(--accent-text); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

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

code, kbd, pre, samp { font-family: var(--font-mono); font-size: .92em; }
code {
  padding: .12em .42em;
  border-radius: 6px;
  background: var(--surface-3);
  color: var(--text);
}
kbd {
  display: inline-block;
  min-width: 20px;
  padding: 1px 6px;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: 6px;
  background: var(--surface);
  color: var(--text-2);
  font-size: 14px;
  line-height: 1.5;
  text-align: center;
}

img, svg { display: block; max-width: 100%; }
svg { flex: none; }

:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

::selection { background: color-mix(in srgb, var(--accent) 28%, transparent); }

/* 滚动条 */
* { scrollbar-width: thin; scrollbar-color: var(--line-strong) transparent; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--line-strong); border-radius: 999px; border: 2px solid transparent; background-clip: content-box; }
::-webkit-scrollbar-thumb:hover { background: var(--text-3); background-clip: content-box; border: 2px solid transparent; }

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed; left: 12px; top: -48px; z-index: 200;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  background: var(--accent); color: var(--on-accent);
  transition: top .15s var(--ease);
}
.skip-link:focus { top: 12px; text-decoration: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}