/* ============================================================
   Clash官网 · 设计系统基础层(base.css)
   风格:米白纸面 + 松绿油墨 的工程手册风
   规则:所有颜色/字体/圆角只允许在 :root 令牌中定义
   ============================================================ */

/* ---------- 01 · 设计令牌 ---------- */
:root {
  /* 纸面层次 */
  --paper: #F6F3EA;          /* 全站底色 */
  --paper-lift: #FCFAF3;     /* 面板/卡片 */
  --paper-deep: #EDE8D8;     /* 深一级面板(代码块/标签底) */

  /* 线条 */
  --rule: #D6CFB9;           /* 主分割线/边框 */
  --rule-faint: #E7E1CF;     /* 更浅的辅助虚线/底纹 */

  /* 油墨 */
  --pine: #1E7A55;           /* 主强调:松绿 */
  --pine-deep: #134F38;      /* 松绿深色变体 */
  --ink: #24281F;            /* 主文字 */
  --ink-dim: #6F6C5B;        /* 次要文字 */

  /* 语义色 */
  --sig-ok: #3D8A42;
  --sig-warn: #A97B12;
  --sig-err: #B23B2E;

  /* 字体 */
  --font-display: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', 'PingFang SC', 'Hiragino Sans', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'Noto Sans SC', 'Noto Sans JP', 'Noto Sans KR', 'PingFang SC', 'Hiragino Sans', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;

  /* 形状与尺寸 */
  --rad-s: 4px;
  --rad-m: 8px;
  --line-w: 1px;
  --wrap: 1120px;

  /* “印刷压痕”式小偏移阴影(替代大面积柔和阴影) */
  --press: 3px 3px 0 var(--rule);
}

/* ---------- 02 · Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background-color: var(--paper);
  background-image: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent 47px,
    var(--rule-faint) 47px,
    var(--rule-faint) 48px
  );
  color: var(--ink);
  font: 400 16px/1.75 var(--font-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 0.5em;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.3;
  color: var(--ink);
  overflow-wrap: break-word;
}

h1 { font-size: clamp(1.8rem, 4.2vw, 2.7rem); letter-spacing: -0.015em; }
h2 { font-size: clamp(1.4rem, 3vw, 1.9rem); }
h3 { font-size: 1.15rem; }

p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; padding-left: 1.4em; }
li { margin-bottom: 0.35em; }

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

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

table { border-collapse: collapse; width: 100%; }
th, td {
  padding: 10px 12px;
  border: var(--line-w) solid var(--rule);
  text-align: left;
  font-size: 0.95rem;
}
th {
  background: var(--paper-deep);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-dim);
  font-weight: 600;
}

a {
  color: var(--pine-deep);
  text-decoration: underline;
  text-decoration-color: var(--rule);
  text-underline-offset: 3px;
  transition: color .18s ease, text-decoration-color .18s ease;
}
a:hover {
  color: var(--pine);
  text-decoration-color: var(--pine);
}

::selection { background: var(--pine); color: var(--paper-lift); }

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

/* ---------- 03 · 排版工具 ---------- */
.wrap {
  max-width: var(--wrap);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

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

.dim { color: var(--ink-dim); }

.sec { padding: 72px 0; }

/* 章节标题:等宽编号 + 标题 + 底部细线,贯穿全站的“手册章节”样式 */
.sec-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 14px;
  margin-bottom: 32px;
  border-bottom: var(--line-w) solid var(--rule);
}
.sec-code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--pine);
  letter-spacing: 0.08em;
  flex-shrink: 0;
}
.sec-head h2 { margin: 0; }
.sec-note {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-dim);
  flex-shrink: 0;
}

/* 代码展示:纸面里的“打字机记录” */
pre {
  margin: 0 0 1.2em;
  padding: 16px 18px;
  background: var(--paper-deep);
  border: var(--line-w) solid var(--rule);
  border-radius: var(--rad-s);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.7;
  max-width: 100%;
}
pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: inherit;
}
code {
  font-family: var(--font-mono);
  font-size: 0.86em;
  background: var(--paper-deep);
  border: var(--line-w) solid var(--rule-faint);
  border-radius: var(--rad-s);
  padding: 0.1em 0.4em;
  overflow-wrap: break-word;
}

blockquote {
  margin: 0 0 1.2em;
  padding: 12px 18px;
  border-left: 4px solid var(--pine);
  background: var(--paper-lift);
  border-radius: 0 var(--rad-s) var(--rad-s) 0;
  color: var(--ink-dim);
}

/* ---------- 04 · 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55em;
  padding: 0.7em 1.4em;
  border: var(--line-w) solid var(--pine-deep);
  border-radius: var(--rad-s);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  background: var(--paper-lift);
  color: var(--pine-deep);
  transition: background .18s ease, color .18s ease, transform .12s ease, box-shadow .12s ease;
}
.btn svg { flex-shrink: 0; }

.btn-solid {
  background: var(--pine);
  color: var(--paper-lift);
  box-shadow: var(--press);
}
.btn-solid:hover {
  background: var(--pine-deep);
  color: var(--paper-lift);
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 var(--rule);
}

.btn-line:hover {
  background: var(--paper-deep);
  color: var(--pine-deep);
}

.btn-mono {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.55em 1em;
  letter-spacing: 0.04em;
}

/* ---------- 05 · 通用面板 / 卡片(sheet) ---------- */
/* 手册卡片:1px 实线边框 + 小圆角 + 左上角章节编码标签 */
.sheet {
  position: relative;
  background: var(--paper-lift);
  border: var(--line-w) solid var(--rule);
  border-radius: var(--rad-m);
  padding: 24px;
}
.sheet-code {
  position: absolute;
  top: -0.72em;
  left: 16px;
  padding: 0 8px;
  background: var(--paper-lift);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--pine);
  line-height: 1.4;
}
.sheet-hover { transition: border-color .18s ease, box-shadow .18s ease; }
.sheet-hover:hover {
  border-color: var(--pine);
  box-shadow: var(--press);
}

.panel-deep {
  background: var(--paper-deep);
  border: var(--line-w) solid var(--rule);
  border-radius: var(--rad-m);
  padding: 20px;
}

/* 通用网格容器:子项必须 min-width:0 防窄屏溢出 */
.grid {
  display: grid;
  gap: 20px;
}
.grid > * { min-width: 0; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

/* ---------- 06 · 头部导航(由 header.js 注入) ---------- */
.mast {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--paper-lift);
  border-bottom: var(--line-w) solid var(--rule);
}

/* 顶部微型索引条,像手册页眉 */
.mast-rail {
  border-bottom: var(--line-w) solid var(--rule-faint);
  background: var(--paper-deep);
}
.mast-rail-in {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--ink-dim);
  padding-top: 5px;
  padding-bottom: 5px;
}
.mast-rail-in span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.mast-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: 64px;
}

.mast-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}
.mast-brand img { display: block; flex-shrink: 0; }
.mast-brand-t { display: flex; flex-direction: column; line-height: 1.25; }
.mast-brand-t strong {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--ink);
  letter-spacing: 0.01em;
}
.mast-brand-t em {
  font-style: normal;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--ink-dim);
  letter-spacing: 0.12em;
}

.mast-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}
.mast-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 12px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  border-radius: var(--rad-s);
  transition: color .15s ease, background .15s ease, box-shadow .15s ease;
}
.mast-idx {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--ink-dim);
  letter-spacing: 0.05em;
  flex-shrink: 0;
}
.mast-link:hover { color: var(--pine-deep); background: var(--paper-deep); }
.mast-link.is-here {
  color: var(--pine-deep);
  box-shadow: inset 0 -2px 0 var(--pine);
}
.mast-link.is-here .mast-idx { color: var(--pine); }

/* 语言切换下拉 */
.lang { position: relative; margin-left: 8px; }
.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 12px;
  background: var(--paper-lift);
  border: var(--line-w) solid var(--rule);
  border-radius: var(--rad-s);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink);
  cursor: pointer;
  transition: border-color .15s ease;
}
.lang-btn svg { flex-shrink: 0; }
.lang-btn:hover { border-color: var(--pine); }
.lang-caret { transition: transform .18s ease; }
.lang.open .lang-caret { transform: rotate(180deg); }

.lang-list {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  min-width: 168px;
  margin: 0;
  padding: 6px;
  list-style: none;
  background: var(--paper-lift);
  border: var(--line-w) solid var(--rule);
  border-radius: var(--rad-m);
  box-shadow: var(--press);
  z-index: 110;
}
.lang.open .lang-list { display: block; }
.lang-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 12px;
  font-size: 0.88rem;
  text-decoration: none;
  color: var(--ink);
  border-radius: var(--rad-s);
}
.lang-list a:hover { background: var(--paper-deep); color: var(--pine-deep); }
.lang-list a.is-cur {
  color: var(--pine-deep);
  font-weight: 600;
  background: var(--paper-deep);
}
.lang-tick {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--pine);
  flex-shrink: 0;
}

/* 汉堡按钮(窄屏) */
.mast-burger {
  display: none;
  margin-left: auto;
  padding: 8px;
  background: var(--paper-lift);
  border: var(--line-w) solid var(--rule);
  border-radius: var(--rad-s);
  cursor: pointer;
  color: var(--ink);
  line-height: 0;
}
.mast-burger:hover { border-color: var(--pine); color: var(--pine-deep); }

/* ---------- 07 · 页脚(由 footer.js 注入) ---------- */
.foot {
  margin-top: 88px;
  background: var(--paper-lift);
  border-top: var(--line-w) solid var(--rule);
}
.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1.1fr 0.8fr;
  gap: 36px;
  padding-top: 52px;
  padding-bottom: 44px;
}
.foot-grid > * { min-width: 0; }

.foot-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  margin-bottom: 12px;
}
.foot-logo img { flex-shrink: 0; }
.foot-logo strong { font-size: 1rem; color: var(--ink); }
.foot-brand p {
  font-size: 0.88rem;
  color: var(--ink-dim);
  margin-bottom: 10px;
}
.foot-ref {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--ink-dim);
}

.foot-h {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--pine);
  margin: 0 0 14px;
  padding-bottom: 8px;
  border-bottom: var(--line-w) solid var(--rule-faint);
}
.foot-col a {
  display: block;
  font-size: 0.88rem;
  color: var(--ink);
  text-decoration: none;
  padding: 4px 0;
}
.foot-col a:hover { color: var(--pine-deep); }

.foot-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.foot-tags a {
  display: inline-block;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-dim);
  background: var(--paper-deep);
  border: var(--line-w) solid var(--rule);
  border-radius: var(--rad-s);
  text-decoration: none;
  transition: color .15s ease, border-color .15s ease;
}
.foot-tags a:hover { color: var(--pine-deep); border-color: var(--pine); }

.foot-base { border-top: var(--line-w) dashed var(--rule); }
.foot-base-in {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  padding-top: 16px;
  padding-bottom: 16px;
  font-size: 0.8rem;
  color: var(--ink-dim);
}
.foot-base-in .mono {
  font-size: 0.66rem;
  letter-spacing: 0.14em;
}

/* ---------- 08 · 滚动淡入 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.shown {
  opacity: 1;
  transform: none;
}
.rv-d1 { transition-delay: .1s; }
.rv-d2 { transition-delay: .2s; }
.rv-d3 { transition-delay: .3s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ---------- 09 · 响应式断点 ---------- */
@media (max-width: 960px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .foot-grid { grid-template-columns: 1fr 1fr; }

  .mast-burger { display: inline-flex; }
  .mast-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    margin: 0;
    padding: 12px 20px 18px;
    background: var(--paper-lift);
    border-bottom: var(--line-w) solid var(--rule);
    box-shadow: var(--press);
  }
  .mast-nav.open { display: flex; }
  .mast-link { padding: 12px 10px; border-radius: var(--rad-s); }
  .mast-link.is-here { box-shadow: inset 3px 0 0 var(--pine); background: var(--paper-deep); }

  .lang { margin: 10px 0 0; }
  .lang-btn { width: 100%; justify-content: space-between; }
  .lang-list {
    position: static;
    box-shadow: none;
    margin-top: 6px;
    min-width: 0;
  }
}

@media (max-width: 640px) {
  body { font-size: 15px; }
  .wrap { padding-left: 16px; padding-right: 16px; }
  .sec { padding: 52px 0; }
  .sec-head { flex-wrap: wrap; gap: 10px; }
  .sec-note { display: none; }

  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr; gap: 28px; }

  .mast-rail-sub { display: none; }
  .mast-inner { min-height: 58px; gap: 14px; }
  .mast-brand-t em { display: none; }

  .btn { padding: 0.68em 1.15em; font-size: 0.9rem; }
  pre { font-size: 0.78rem; padding: 12px 14px; }
}

@media (max-width: 400px) {
  .mast-brand-t strong { font-size: 0.95rem; }
  .foot-base-in { flex-direction: column; align-items: flex-start; gap: 4px; }
}

@media (max-width: 960px) {
  html.nav-lock { overflow: hidden; }
  .mast-nav.open {
    max-height: calc(100vh - 64px);
    max-height: calc(100dvh - 64px);
    overflow-y: auto;
    overscroll-behavior: contain;
  }
}