/* ==========================================================================
   Clash官网 · base.css
   「晴空精密仪器」浅色技术风:浅天蓝底 + 白色直角面板 + 1px 冷调细线
   全部颜色/字体/圆角取值只在 :root 令牌中定义,组件一律引用变量
   ========================================================================== */

:root {
  /* --- 色彩令牌 --- */
  --c-sky: #E9F3FA;          /* 全站底色:浅天蓝 */
  --c-pane: #FFFFFF;         /* 一级面板:淡云白 */
  --c-pane-2: #F3F9FD;       /* 二级面板:更浅的蓝白 */
  --c-line: #C6DCEB;         /* 冷调 1px 分割线/边框 */
  --c-core: #0E9BE0;         /* 主色:清亮晴空蓝 */
  --c-core-deep: #0871AC;    /* 主色深变体:悬停/文字链 */
  --c-beam: #3CC8FF;         /* 电光蓝:仅用于扫光/光条/光斑 */
  --c-beam-soft: rgba(60, 200, 255, 0.45); /* 电光蓝弱化(扫光渐变用) */
  --c-ink: #132B3A;          /* 主文字 */
  --c-ink-soft: #57717F;     /* 次要文字 */
  --c-ok: #1E9E6A;           /* 成功 */
  --c-warn: #C07A12;         /* 警告 */
  --c-err: #C5402C;          /* 错误 */
  --c-on-core: #FFFFFF;      /* 主色底上的文字 */
  --c-code-bg: #0F2230;      /* 代码块深底 */
  --c-code-ink: #D7E9F5;     /* 代码块文字 */

  /* --- 字体令牌 --- */
  --f-display: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --f-ui: 'Inter', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --f-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Courier New', monospace;

  /* --- 形状/布局令牌 --- */
  --edge: 0;                        /* 全站锐利直角 */
  --gutter: clamp(16px, 4vw, 32px); /* 版心左右留白,窄屏不低于 16px */
  --wrap: 1128px;                   /* 版心宽度 */
  --hdr-h: 60px;                    /* 页头高度 */
}

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

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

html.nav-open {
  overflow: hidden;
}

body {
  margin: 0;
  background: var(--c-sky);
  color: var(--c-ink);
  font-family: var(--f-ui);
  font-size: 15px;
  line-height: 1.75;
  overflow-x: clip;
}

img,
svg {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

::selection {
  background: var(--c-core);
  color: var(--c-on-core);
}

:focus-visible {
  outline: 2px solid var(--c-core);
  outline-offset: 2px;
}

/* --- 排版 --- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--f-display);
  color: var(--c-ink);
  line-height: 1.3;
  margin: 0 0 0.6em;
  font-weight: 700;
}

h1 { font-size: clamp(28px, 4.6vw, 42px); letter-spacing: -0.01em; }
h2 { font-size: clamp(21px, 3vw, 28px); }
h3 { font-size: 18px; }
h4 { font-size: 15px; }

p {
  margin: 0 0 1em;
}

a {
  color: var(--c-core-deep);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--c-core);
}

ul, ol {
  margin: 0 0 1em;
  padding-left: 1.4em;
}

hr {
  border: 0;
  border-top: 1px solid var(--c-line);
  margin: 32px 0;
}

code {
  font-family: var(--f-mono);
  font-size: 0.9em;
  background: var(--c-pane-2);
  border: 1px solid var(--c-line);
  padding: 1px 6px;
}

pre {
  background: var(--c-code-bg);
  color: var(--c-code-ink);
  border: 1px solid var(--c-line);
  border-radius: var(--edge);
  padding: 16px 20px;
  overflow-x: auto;
  font-family: var(--f-mono);
  font-size: 13px;
  line-height: 1.7;
  margin: 0 0 1.2em;
}

pre code {
  background: transparent;
  border: 0;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

blockquote {
  margin: 0 0 1.2em;
  padding: 12px 18px;
  border-left: 2px solid var(--c-core);
  background: var(--c-pane-2);
  color: var(--c-ink-soft);
}

.mono {
  font-family: var(--f-mono);
}

/* --- 版心与区块节奏 --- */
.wrap {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* 区块节奏只声明纵向内边距,严禁 padding: Y 0 简写(防覆盖版心左右留白) */
.strip {
  padding-top: 64px;
  padding-bottom: 64px;
}

.strip--tight {
  padding-top: 36px;
  padding-bottom: 36px;
}

.sec-head {
  margin-bottom: 30px;
}

.kicker {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-core-deep);
  margin-bottom: 8px;
}

.sec-head p {
  color: var(--c-ink-soft);
  max-width: 720px;
  margin-bottom: 0;
}

/* --- 通用面板 --- */
.pane {
  background: var(--c-pane);
  border: 1px solid var(--c-line);
  border-radius: var(--edge);
}

.pane--tint {
  background: var(--c-pane-2);
}

.pane-pad {
  padding: 24px 26px;
}

/* --- 刻度装饰条(状态刻度,纯装饰) --- */
.scalebar {
  height: 8px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--c-line) 0,
    var(--c-line) 1px,
    transparent 1px,
    transparent 10px
  );
}

/* --- 按钮 --- */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 26px;
  border: 1px solid var(--c-core-deep);
  border-radius: var(--edge);
  font-family: var(--f-ui);
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  overflow: hidden;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.btn svg {
  flex-shrink: 0;
}

/* 悬停扫光:电光蓝细带自左向右掠过一次 */
.btn::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: -45%;
  width: 45%;
  background: linear-gradient(100deg, transparent, var(--c-beam-soft), transparent);
  transform: skewX(-18deg);
  opacity: 0;
  pointer-events: none;
}

.btn:hover::after {
  animation: beamSweep 0.55s ease-out 1;
}

@keyframes beamSweep {
  0%   { transform: translateX(0) skewX(-18deg); opacity: 0.9; }
  100% { transform: translateX(340%) skewX(-18deg); opacity: 0; }
}

.btn--solid {
  background: var(--c-core);
  color: var(--c-on-core);
}

.btn--solid:hover {
  background: var(--c-core-deep);
  color: var(--c-on-core);
}

.btn--line {
  background: var(--c-pane);
  color: var(--c-core-deep);
  border-color: var(--c-line);
}

.btn--line:hover {
  border-color: var(--c-core);
  color: var(--c-core);
}

.btn--sm {
  min-height: 36px;
  padding: 8px 16px;
  font-size: 13px;
}

.btn[aria-disabled="true"] {
  opacity: 0.5;
  pointer-events: none;
}

/* --- 页头(header.js 注入) --- */
.hd-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--c-pane);
  border-bottom: 1px solid var(--c-line);
}

.hd-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: var(--hdr-h);
}

.hd-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--c-ink);
  font-weight: 700;
  font-size: 16px;
  white-space: nowrap;
}

.hd-brand img {
  flex-shrink: 0;
  display: block;
}

.hd-nav {
  min-width: 0;
}

.hd-menu {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
}

.hd-menu li {
  display: flex;
  align-items: center;
}

/* 中点分隔的极简一行导航 */
.hd-menu li + li::before {
  content: "·";
  margin: 0 11px;
  color: var(--c-ink-soft);
  opacity: 0.55;
}

.hd-link {
  display: inline-block;
  padding: 4px 2px;
  color: var(--c-ink-soft);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  border-bottom: 2px solid transparent;
}

.hd-link:hover {
  color: var(--c-core-deep);
}

.hd-link.is-here {
  color: var(--c-core-deep);
  border-bottom-color: var(--c-core);
}

.hd-tools {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.hd-lang {
  position: relative;
}

.hd-langbtn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 36px;
  padding: 6px 12px;
  border: 1px solid var(--c-line);
  border-radius: var(--edge);
  background: var(--c-pane);
  color: var(--c-ink-soft);
  font-family: var(--f-mono);
  font-size: 12px;
  cursor: pointer;
}

.hd-langbtn:hover {
  border-color: var(--c-core);
  color: var(--c-core-deep);
}

.hd-langmenu {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  min-width: 150px;
  background: var(--c-pane);
  border: 1px solid var(--c-line);
  border-radius: var(--edge);
  list-style: none;
  margin: 0;
  padding: 4px 0;
  z-index: 130;
}

.hd-langmenu a {
  display: block;
  padding: 10px 16px;
  color: var(--c-ink-soft);
  text-decoration: none;
  font-size: 13px;
}

.hd-langmenu a:hover {
  background: var(--c-pane-2);
  color: var(--c-core-deep);
}

.hd-langmenu a.is-cur {
  color: var(--c-core-deep);
  background: var(--c-pane-2);
  font-weight: 600;
}

.hd-burger {
  display: none;
  min-width: 44px;
  min-height: 44px;
  border: 1px solid var(--c-line);
  border-radius: var(--edge);
  background: var(--c-pane);
  cursor: pointer;
  padding: 0;
}

.hd-burger-i {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--c-ink);
  margin: 0 auto;
  position: relative;
}

.hd-burger-i::before,
.hd-burger-i::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--c-ink);
}

.hd-burger-i::before { top: -6px; }
.hd-burger-i::after  { top: 6px; }

/* --- 页脚(footer.js 注入) --- */
.ft {
  margin-top: 72px;
  background: var(--c-pane);
  border-top: 1px solid var(--c-line);
}

.ft-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.1fr 0.8fr;
  gap: 36px;
  padding-top: 48px;
  padding-bottom: 36px;
}

.ft-grid > * {
  min-width: 0;
}

.ft-brand {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}

.ft-brand img {
  flex-shrink: 0;
}

.ft-brand strong {
  display: block;
  font-size: 15px;
  margin-bottom: 6px;
}

.ft-brand p {
  margin: 0;
  color: var(--c-ink-soft);
  font-size: 13px;
  line-height: 1.8;
}

.ft-col h3 {
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-ink-soft);
  margin-bottom: 14px;
}

.ft-col ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.ft-col li {
  margin-bottom: 9px;
}

.ft-col a {
  color: var(--c-ink-soft);
  text-decoration: none;
  font-size: 13px;
}

.ft-col a:hover {
  color: var(--c-core-deep);
  text-decoration: underline;
}

.ft-base {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--c-line);
  padding-top: 18px;
  padding-bottom: 22px;
  color: var(--c-ink-soft);
  font-size: 13px;
}

.ft-legal {
  display: flex;
  gap: 18px;
}

.ft-legal a {
  color: var(--c-ink-soft);
  text-decoration: none;
}

.ft-legal a:hover {
  color: var(--c-core-deep);
  text-decoration: underline;
}

/* --- 滚动淡入(reveal.js) --- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.shown {
  opacity: 1;
  transform: none;
}

/* --- 通用防溢出 --- */
.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* --- 响应式 --- */
@media (max-width: 900px) {
  /* 导航收进抽屉:面板实色不透明、整行可点、锁背景滚动 */
  .hd-nav {
    display: none;
    position: fixed;
    top: var(--hdr-h);
    left: 0;
    right: 0;
    background: var(--c-pane);
    border-bottom: 1px solid var(--c-line);
    max-height: calc(100dvh - var(--hdr-h));
    overflow-y: auto;
    overscroll-behavior: contain;
    z-index: 110;
  }

  .hd-nav.open {
    display: block;
  }

  .hd-menu {
    display: block;
  }

  .hd-menu li {
    display: block;
  }

  .hd-menu li + li::before {
    content: none;
  }

  .hd-menu li + li {
    border-top: 1px solid var(--c-line);
  }

  .hd-link {
    display: block;
    width: 100%;
    min-height: 44px;
    padding: 14px var(--gutter);
    border-bottom: 0;
    font-size: 15px;
  }

  .hd-link.is-here {
    background: var(--c-pane-2);
    border-left: 2px solid var(--c-core);
  }

  .hd-burger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  /* 抽屉断点下工具区必须自己贴最右(导航脱离文档流后 auto 边距不能丢) */
  .hd-tools {
    margin-left: auto;
  }

  .ft-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
}

@media (max-width: 640px) {
  .strip {
    padding-top: 44px;
    padding-bottom: 44px;
  }

  .ft-grid {
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .ft-base {
    flex-direction: column;
    align-items: flex-start;
  }

  .pane-pad {
    padding: 18px;
  }
}

/* --- 降级动效 --- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}