/* =============================================================
   Clash中文指南 · 「赤陶手册」设计系统 · 基础层 base.css
   暖纸底 / 近墨炭灰正文 / 全站直角 / 1px 浅描边
   无投影 · 无渐变 · 无光晕,唯一强调色为赤陶砖橙
   ============================================================= */

/* ---------- 1. 设计令牌 ---------- */
:root {
  /* 色彩 */
  --paper: #FBF7F1;        /* 页面底色(暖白纸感) */
  --paper-panel: #FFFDF9;  /* 面板/卡片底 */
  --paper-tint: #F3EEE6;   /* 代码块/次级面板底 */
  --rule: #E4DCD0;         /* 描边/分割线 */
  --brick: #B24A2C;        /* 强调色:赤陶砖橙 */
  --brick-deep: #8C3820;   /* 强调色深阶(hover) */
  --ink: #2B2620;          /* 正文近墨炭灰 */
  --ink-mute: #6F6559;     /* 次要文字 */
  --ok: #3E7A4E;           /* 成功 */
  --warn: #A97B1E;         /* 警告 */
  --bad: #9C2F2F;          /* 错误 */
  --grain: rgba(43, 38, 32, 0.03); /* 纸纹理细线 */

  /* 字体 */
  --font-head: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-text: 'Inter', 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-code: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  /* 形状:全站直角 */
  --corner: 0;

  /* 版面 */
  --page-w: 1080px;
  --gutter: 24px;
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-text);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink);
  background-color: var(--paper);
  background-image: repeating-linear-gradient(
    180deg,
    var(--grain) 0,
    var(--grain) 1px,
    transparent 1px,
    transparent 8px
  );
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: inline-block; }
svg { display: inline-block; }

::selection { background: var(--brick); color: var(--paper-panel); }

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

/* ---------- 3. 排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-head);
  color: var(--ink);
  margin: 0 0 0.6em;
  letter-spacing: -0.02em;
}

h1 { font-weight: 800; font-size: clamp(1.9rem, 5vw, 3.2rem); line-height: 1.18; }
h2 { font-weight: 800; font-size: clamp(1.4rem, 3.2vw, 1.9rem); line-height: 1.3; }
h3 { font-weight: 700; font-size: 1.15rem; line-height: 1.45; }
h4 { font-weight: 700; font-size: 1rem; line-height: 1.5; }

p { margin: 0 0 1.1em; }
ul, ol { margin: 0 0 1.1em; padding-left: 1.4em; }
li { margin-bottom: 0.35em; }
hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }
small { font-size: 0.82em; color: var(--ink-mute); }

a {
  color: var(--brick);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.18s ease;
}
a:hover { color: var(--brick-deep); }

strong { font-weight: 700; color: var(--ink); }

blockquote {
  margin: 1.5rem 0;
  padding: 0.2rem 0 0.2rem 1.2rem;
  border-left: 3px solid var(--rule);
  color: var(--ink-mute);
}

/* 代码:全站视觉锚点 */
code, kbd, samp { font-family: var(--font-code); }

pre {
  background: var(--paper-tint);
  border: 1px solid var(--rule);
  border-radius: var(--corner);
  padding: 1rem 1.25rem;
  margin: 1.4rem 0;
  overflow-x: auto;
  font-family: var(--font-code);
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--ink);
}
pre code { background: none; border: 0; padding: 0; font-size: inherit; }

:not(pre) > code {
  background: var(--paper-tint);
  border: 1px solid var(--rule);
  border-radius: var(--corner);
  padding: 0.1em 0.4em;
  font-size: 0.88em;
}

/* 表格 */
.sheet-wrap { overflow-x: auto; margin: 1.4rem 0; }
.sheet { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.sheet th, .sheet td {
  border: 1px solid var(--rule);
  padding: 0.6em 0.95em;
  text-align: left;
  vertical-align: top;
}
.sheet th {
  background: var(--paper-tint);
  font-family: var(--font-code);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  color: var(--ink);
}
.sheet td { background: var(--paper-panel); color: var(--ink-mute); }

/* ---------- 4. 版面骨架 ---------- */
.wrap {
  width: 100%;
  max-width: calc(var(--page-w) + var(--gutter) * 2);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.section { padding: 4.2rem 0; }
.section-tint {
  background: var(--paper-panel);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.sec-head { margin-bottom: 2.2rem; max-width: 46em; }
.sec-kicker {
  display: block;
  font-family: var(--font-code);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-mute);
  margin-bottom: 0.7rem;
}
.sec-kicker::before { content: "\00A7 "; color: var(--brick); }
.sec-title { margin-bottom: 0.4em; }
.sec-note { color: var(--ink-mute); margin: 0; }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.4rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.4rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.4rem; }
.grid-2 > *, .grid-3 > *, .grid-4 > * { min-width: 0; }

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.75em 1.6em;
  border: 1px solid transparent;
  border-radius: var(--corner);
  font-family: var(--font-text);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}
.btn svg { width: 16px; height: 16px; flex-shrink: 0; }

.btn-solid {
  background: var(--brick);
  border-color: var(--brick);
  color: var(--paper-panel);
}
.btn-solid:hover { background: var(--brick-deep); border-color: var(--brick-deep); color: var(--paper-panel); }

.btn-ghost {
  background: transparent;
  border-color: var(--ink);
  color: var(--ink);
}
.btn-ghost:hover { background: var(--paper-tint); color: var(--ink); }

.btn-line {
  background: transparent;
  border-color: var(--brick);
  color: var(--brick-deep);
}
.btn-line:hover { background: var(--paper-tint); color: var(--brick-deep); }

.btn-sm { padding: 0.55em 1.1em; font-size: 0.85rem; }

.btn:disabled,
.btn[aria-disabled="true"] { opacity: 0.45; pointer-events: none; }

/* ---------- 6. 通用面板/卡片 ---------- */
.panel {
  background: var(--paper-panel);
  border: 1px solid var(--rule);
  border-radius: var(--corner);
  padding: 1.5rem 1.6rem;
  min-width: 0;
}
.panel-tint { background: var(--paper-tint); }
.panel-spine { border-top: 3px solid var(--brick); }

/* ---------- 7. Hero(居中极简,无动画) ---------- */
.hero { padding: 4.6rem 0 3.6rem; text-align: center; }
.hero-mark { display: flex; justify-content: center; margin-bottom: 1.7rem; }
.hero-mark img { width: 92px; height: 92px; flex-shrink: 0; }
.hero-title { margin-bottom: 0.5em; }
.hero-lead {
  max-width: 38em;
  margin: 0 auto;
  color: var(--ink-mute);
  font-size: 1.06rem;
}
.hero-lead strong { color: var(--brick-deep); font-weight: 700; }
.hero-actions {
  display: flex;
  justify-content: center;
  gap: 0.9rem;
  flex-wrap: wrap;
  margin-top: 2.1rem;
}
.hero-chips {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-top: 1.7rem;
  padding: 0;
  list-style: none;
}
.hero-chip {
  font-family: var(--font-code);
  font-size: 0.78rem;
  color: var(--ink-mute);
  border: 1px solid var(--rule);
  background: var(--paper-panel);
  padding: 0.3em 0.85em;
  margin: 0;
}
.hero-chip::before { content: "· "; color: var(--brick); }

/* ---------- 8. 头部导航(header.js 注入) ---------- */
#site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: var(--paper-panel);
  border-bottom: 1px solid var(--rule);
}

.mast {
  display: flex;
  align-items: center;
  gap: 1.6rem;
  min-height: 62px;
}

.mast-brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--ink);
  flex-shrink: 0;
}
.mast-brand img { width: 34px; height: 34px; flex-shrink: 0; }
.mast-brand .mast-name {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
}

.mast-nav { margin-left: auto; }
.mast-menu {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.mast-menu a {
  display: inline-flex;
  align-items: center;
  gap: 0.42em;
  padding: 0.5em 0.85em;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.18s ease;
}
.mast-menu a svg { width: 15px; height: 15px; flex-shrink: 0; color: var(--ink-mute); }
.mast-menu a:hover { color: var(--brick-deep); }
.mast-menu a:hover svg { color: var(--brick-deep); }
.mast-menu a[aria-current="page"] {
  color: var(--brick-deep);
  border-bottom-color: var(--brick);
  font-weight: 600;
}
.mast-menu a[aria-current="page"] svg { color: var(--brick); }

/* 语言切换 */
.lang-box { position: relative; flex-shrink: 0; }
.lang-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  background: var(--paper-panel);
  border: 1px solid var(--rule);
  border-radius: var(--corner);
  padding: 0.45em 0.85em;
  font-family: var(--font-code);
  font-size: 0.8rem;
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.18s ease;
}
.lang-btn:hover { border-color: var(--brick); }
.lang-btn svg { width: 13px; height: 13px; flex-shrink: 0; }
.lang-list {
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  min-width: 156px;
  background: var(--paper-panel);
  border: 1px solid var(--rule);
  border-radius: var(--corner);
  list-style: none;
  margin: 0;
  padding: 0.3rem 0;
  display: none;
}
.lang-box.open .lang-list { display: block; }
.lang-list a {
  display: block;
  padding: 0.45em 1em;
  font-size: 0.88rem;
  color: var(--ink);
  text-decoration: none;
}
.lang-list a:hover { background: var(--paper-tint); color: var(--brick-deep); }
.lang-list a[aria-current="true"] {
  color: var(--brick-deep);
  font-weight: 600;
  background: var(--paper-tint);
}

/* 汉堡按钮 */
.mast-toggle {
  display: none;
  background: none;
  border: 1px solid var(--rule);
  border-radius: var(--corner);
  padding: 0.45em 0.6em;
  cursor: pointer;
  color: var(--ink);
  flex-shrink: 0;
}
.mast-toggle svg { width: 18px; height: 18px; display: block; }

/* ---------- 9. 页脚(footer.js 注入) ---------- */
#site-footer {
  margin-top: 4rem;
  background: var(--paper-panel);
  border-top: 1px solid var(--rule);
  color: var(--ink-mute);
  font-size: 0.9rem;
}
.foot-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.4fr;
  gap: 2.4rem;
  padding: 3rem 0 2.2rem;
}
.foot-grid > * { min-width: 0; }
.foot-brand { display: flex; align-items: flex-start; gap: 0.8rem; }
.foot-brand img { width: 38px; height: 38px; flex-shrink: 0; }
.foot-brand-name {
  font-family: var(--font-head);
  font-weight: 800;
  color: var(--ink);
  font-size: 1rem;
  margin-bottom: 0.3em;
}
.foot-brand p { margin: 0; line-height: 1.7; }

.foot-h {
  font-family: var(--font-code);
  font-size: 0.74rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink);
  margin: 0 0 0.9rem;
}
.foot-h::before { content: "// "; color: var(--brick); }

.foot-links { list-style: none; margin: 0; padding: 0; }
.foot-links li { margin-bottom: 0.45em; }
.foot-links a { color: var(--ink-mute); text-decoration: none; }
.foot-links a:hover { color: var(--brick-deep); text-decoration: underline; }

.foot-hot { display: flex; flex-wrap: wrap; gap: 0.5rem; margin: 0; padding: 0; list-style: none; }
.foot-hot a {
  display: inline-block;
  border: 1px solid var(--rule);
  background: var(--paper);
  padding: 0.25em 0.7em;
  font-size: 0.8rem;
  color: var(--ink-mute);
  text-decoration: none;
}
.foot-hot a:hover { border-color: var(--brick); color: var(--brick-deep); }

.foot-langs { display: flex; flex-wrap: wrap; gap: 0.4rem 1rem; margin: 0; padding: 0; list-style: none; }
.foot-langs a { color: var(--ink-mute); text-decoration: none; font-size: 0.84rem; }
.foot-langs a:hover { color: var(--brick-deep); text-decoration: underline; }

.foot-base {
  border-top: 1px solid var(--rule);
  padding: 1.1rem 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1.5rem;
  font-size: 0.8rem;
}
.foot-base p { margin: 0; }

/* ---------- 10. 滚动淡入 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}
.reveal.shown { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- 11. 响应式 ---------- */
@media (max-width: 960px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .mast { min-height: 56px; gap: 0.8rem; }
  .mast-toggle { display: inline-flex; margin-left: auto; }
  .mast-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    margin-left: 0;
    background: var(--paper-panel);
    border-bottom: 1px solid var(--rule);
  }
  .mast-nav.open { display: block; }
  .mast-menu {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.4rem 0;
  }
  .mast-menu a {
    display: flex;
    padding: 0.8em var(--gutter);
    border-bottom: 0;
    border-left: 3px solid transparent;
  }
  .mast-menu a[aria-current="page"] { border-left-color: var(--brick); }
}

@media (max-width: 640px) {
  body { font-size: 15px; }
  .section { padding: 3rem 0; }
  .hero { padding: 3.2rem 0 2.6rem; }
  .hero-mark img { width: 72px; height: 72px; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr; gap: 1.8rem; padding: 2.2rem 0 1.6rem; }
  .panel { padding: 1.2rem 1.1rem; }
  pre { padding: 0.85rem 1rem; font-size: 0.8rem; }
  .hero-actions .btn { width: 100%; max-width: 320px; }
}

@media (max-width: 380px) {
  :root { --gutter: 16px; }
  .mast-brand .mast-name { font-size: 0.92rem; }
}
@media (max-width: 768px) {
  html.nav-lock { overflow: hidden; }
  .mast-nav.open {
    max-height: calc(100vh - 64px);
    max-height: calc(100dvh - 64px);
    overflow-y: auto;
    overscroll-behavior: contain;
  }
}