/* =========================================================
   Python 教程网 · 样式表
   主题：Kawaii × 奶油软萌  (柔和、干净、可爱)
   仅改视觉 + 文案语气，布局结构与功能逻辑不变
   ========================================================= */

/* ---------- 字体加载（仅标题用可爱字体）---------- */
/* 站酷快乐体 / Nunito / Quicksand 作为标题，正文仍用系统无衬线 */
@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@700;800;900&family=Quicksand:wght@700;800&display=swap');

:root {
  /* ===== 色板：米白背景 / 樱花粉主色 / 薄荷绿·奶油黄·薰衣草辅色 ===== */
  --bg:            #FFFDF7;   /* 主背景 —— 极浅米白   */
  --bg-soft:       #FFF5F7;   /* 极浅樱花粉面板       */
  --panel:         #FFFFFF;   /* 卡片 / 面板纯白      */
  --panel-2:       #FFF7F9;   /* 次层面板 —— 米粉浅色  */
  --line:          rgba(0,0,0,.06);  /* 浅描边，无直角感 */
  --text:          #4A4A4A;   /* 正文色 —— 深灰      */
  --text-dim:      #8A8A8A;   /* 次要文字色           */
  --heading:       #3A3A3A;   /* 标题色               */

  /* 主色 + 辅色 (≤ 3 种主色，辅色为同色系深浅变化) */
  --accent:        #FFB7C5;   /* 樱花粉 —— 主色        */
  --accent-ink:    #FFFFFF;   /* 按钮文字              */
  --pink-light:    #FFF5F7;
  --pink-deep:     #FF8FA3;   /* 珊瑚粉 —— 链接/强调   */
  --pink-lv1:      #FFE8EE;
  --mint:          #B5EAD7;   /* 薄荷绿 —— 辅色        */
  --cream:         #FFF4BD;   /* 奶油黄 —— 辅色        */
  --lavender:      #E2D1F9;   /* 薰衣草紫 —— 辅色      */

  --blue:          #86C2D8;   /* 取暖蓝(柔和)         */
  --blue2:         #A4D0E8;   /* 浅蓝                 */
  --green:         #A3D9A5;   /* 薄荷绿（取暖）       */
  --orange:        #FFCBA5;   /* 奶油橙（柔和）       */
  --red:           #FFB3BA;   /* 樱樱红（柔和）       */
  --purple:        #D5B9FF;   /* 薰衣草（柔和）       */

  /* 代码区 */
  --code-bg:       #FFF8F0;   /* 极浅奶油黄           */
  --code-text:     #4A4A4A;   /* 深灰 —— �可读性     */
  --inline-bg:     #FFF0F3;   /* 极浅粉 —— 代码行     */
  --inline-text:   #C64C6D;
  --inline-border: rgba(255,183,197,.25);
  --th-bg:         #FFF0F3;

  --mark-bg:       rgba(255,183,197,.32);
  --mark-text:     #C64C6D;
  --shadow:        0 8px 24px rgba(255,183,197,.18);  /* 萌系主色阴影   */
  --shadow-hover:  0 12px 30px rgba(255,183,197,.28);

  --mono: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, Consolas, "Courier New", monospace;
  --kawaii: "Nunito", "Quicksand", -apple-system, BlinkMacSystemFont, sans-serif;
}

/* 深色主题 —— 暗黑也螐变柔和可爱 */
[data-theme="dark"] {
  --bg:            #1A1218;
  --bg-soft:       #2D1E25;
  --panel:         #281B23;
  --panel-2:       #352630;
  --line:          rgba(255,255,255,.07);
  --text:          #E0D7DA;
  --text-dim:      #A89FA7;
  --heading:       #E8DCE0;

  --accent:        #FFB7C5;
  --accent-ink:    #2B1E25;

  --pink-light:    #3D2A33;
  --pink-deep:     #FF8FA3;
  --pink-lv1:      #5A3E48;
  --mint:          #72C2A8;
  --cream:         #E0CB8C;
  --lavender:      #A995D0;

  --blue:          #7DB3C9;
  --blue2:         #9FC9DD;
  --green:         #8AC98F;
  --orange:        #E5B27E;
  --red:           #FF9FA8;
  --purple:        #B99CFF;

  --code-bg:       #281B23;
  --code-text:     #D5C7CF;
  --inline-bg:     #4A2E38;
  --inline-text:   #F2B8C9;
  --inline-border: rgba(255,183,197,.25);
  --th-bg:         #3A2935;

  --mark-bg:       rgba(255,183,197,.32);
  --mark-text:     #FFB7C5;
  --shadow:        0 8px 24px rgba(255,183,197,.12);
  --shadow-hover:  0 12px 30px rgba(255,183,197,.22);
}

/* ---------- 基础重置 ---------- */
* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 56px;
}

/* 全局过渡：柔软的弹簧曲线 */
body,
.transition-all {
  transition: background-color .25s cubic-bezier(.34,1.56,.64,1),
              color .25s cubic-bezier(.34,1.56,.64,1),
              border-color .25s cubic-bezier(.34,1.56,.64,1);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  line-height: 1.8;
  font-size: 17px;        /* 放大一级，正文≥16px */
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "liga" 1;
}

/* 分页加载动画：元素依次上浮淡入 */
body:not(.loaded) .hero > * > *,
body:not(.loaded) .content > *:not(.topbar) {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .5s ease, transform .5s ease;
}
body.loaded .hero > * > *,
body.loaded .content > *:not(.topbar) {
  opacity: 1;
  transform: translateY(0);
}
body:not(.loaded) .hero > *:nth-child(1) { transition-delay: .00s; }
body:not(.loaded) .hero > *:nth-child(2) { transition-delay: .06s; }
body:not(.loaded) .hero > *:nth-child(3) { transition-delay: .12s; }

/* ---------- 主题过渡类 ---------- */
body.theme-transition,
body.theme-transition * {
  transition: background-color .25s ease, color .25s ease, border-color .25s ease;
}

/* ========== 顶栏 ========== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 20px;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  flex-wrap: nowrap;
  box-shadow: 0 2px 8px rgba(0,0,0,.04);
}

.topbar .logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 800;
  font-size: 18px;
  font-family: var(--kawaii);
  color: var(--accent);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  min-width: 0;
}

/* logo 点 • —— 可爱渐变圆点 */
.logo-dot {
  width: 24px; height: 24px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--mint));
  display: inline-block;
  flex-shrink: 0;
  box-shadow: 0 2px 6px rgba(255,183,197,.25);
}

.topbar .spacer { flex: 1; min-width: 0; }

.nav-btn {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text-dim);
  padding: 8px 14px;
  border-radius: 16px;
  cursor: pointer;
  font-size: 14px;
  font-family: inherit;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all .25s cubic-bezier(.34,1.56,.64,1);
  white-space: nowrap;
  flex-shrink: 0;
}

.nav-btn:hover {
  color: var(--pink-deep);
  border-color: var(--accent);
  background: var(--panel-2);
  transform: scale(1.05);
}
.nav-btn:active { transform: scale(.97); }
.nav-btn.icon { padding: 8px 11px; font-size: 15px; }

.progress {
  position: absolute;
  left: 0; bottom: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--mint));
  border-radius: 2px;
}

/* ========== 布局 ========== */
.layout { display: flex; align-items: flex-start; gap: 24px; }

.sidebar {
  position: sticky;
  top: 59px;
  width: 280px;
  flex: 0 0 280px;
  height: calc(100vh - 59px);
  overflow-y: auto;
  border-right: 1px solid var(--line);
  padding: 18px 12px 60px;
  background: var(--bg-soft);
  border-radius: 0 20px 20px 0;
}

.sidebar h3 {
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--text-dim);
  padding: 16px 10px 6px;
  margin: 0;
  border-top: 1px dashed var(--line);
  font-family: var(--mono);
}
.sidebar h3:first-child { border-top: none; }

.sidebar a {
  display: block;
  padding: 7px 12px;
  margin: 2px 0;
  border-radius: 12px;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 14px;
  border-left: 2px solid transparent;
  transition: all .22s cubic-bezier(.34,1.56,.64,1);
}
.sidebar a:hover {
  background: var(--panel-2);
  color: var(--pink-deep);
  border-left-color: var(--accent);
  transform: translateX(4px);
}
.sidebar a.active {
  background: var(--panel-2);
  color: var(--pink-deep);
  border-left-color: var(--accent);
  font-weight: 600;
  box-shadow: inset 0 0 0 2px rgba(255,183,197,.2);
}

.side-filter {
  display: block;
  width: calc(100% - 24px);
  margin: 8px 12px 12px;
  padding: 10px 14px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  transition: all .25s cubic-bezier(.34,1.56,.64,1);
}
.side-filter::placeholder { color: var(--text-dim); }
.side-filter:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(255,183,197,.2);
}

.content {
  flex: 1;
  min-width: 0;
  padding: 32px clamp(20px, 4vw, 56px) 90px;
  max-width: 1080px;
}

/* ========== 文章排版 ========== */
.crumb {
  color: var(--text-dim);
  font-size: 13px;
  margin-bottom: 8px;
}

h1 {
  font-family: var(--kawaii);
  font-size: clamp(28px, 5vw, 38px);
  line-height: 1.3;
  margin: 8px 0 16px;
  color: var(--heading);
  font-weight: 900;
}

h2 {
  font-family: var(--kawaii);
  font-size: clamp(22px, 3.5vw, 26px);
  margin: 48px 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  color: var(--heading);
  scroll-margin-top: 72px;
  font-weight: 800;
}

h3 {
  font-family: var(--kawaii);
  font-size: clamp(18px, 2.8vw, 21px);
  margin: 32px 0 12px;
  color: var(--heading);
  font-weight: 800;
}

h4 {
  font-size: 16px;
  margin: 22px 0 8px;
  color: var(--blue2);
  font-weight: 700;
}

.lead {
  background: var(--panel);
  border-left: 4px solid var(--accent);
  padding: 18px 22px;
  border-radius: 16px;
  color: var(--text-dim);
  margin: 20px 0 28px;
  box-shadow: var(--shadow);
  transition: all .25s cubic-bezier(.34,1.56,.64,1);
}
.lead:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-left-color: var(--pink-deep);
}
.lead b, .lead strong { color: var(--pink-deep); }

p { margin: 14px 0; }

ul, ol { padding-left: 28px; }
li { margin: 7px 0; }

a { color: var(--pink-deep); }
a:hover { color: var(--pink-deep); text-decoration: underline; }

code {
  font-family: var(--mono);
  font-size: .88em;
  background: var(--inline-bg);
  padding: 3px 8px;
  border-radius: 8px;
  color: var(--inline-text);
  border: 1px solid var(--inline-border);
  word-break: break-word;
  font-weight: 500;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px 20px;
  overflow-x: auto;
  position: relative;
  margin: 18px 0;
  line-height: 1.7;
  box-shadow: var(--shadow);
  transition: all .25s cubic-bezier(.34,1.56,.64,1);
}
pre:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent);
}
pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--code-text);
  font-size: 14px;
  word-break: normal;
}

.copy-btn {
  position: absolute;
  top: 10px; right: 10px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  color: var(--text-dim);
  border-radius: 12px;
  font-size: 12px;
  padding: 4px 11px;
  cursor: pointer;
  opacity: 0;
  transition: all .22s cubic-bezier(.34,1.56,.64,1);
}
pre:hover .copy-btn { opacity: 1; }
.copy-btn:hover {
  color: var(--pink-deep);
  border-color: var(--accent);
  transform: scale(1.08);
}

/* ========== 表格 ========== */
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 20px 0;
  font-size: 15px;
  display: block;
  overflow-x: auto;
  border-radius: 14px;
  overflow: hidden;
}
th, td {
  border: 1px solid var(--line);
  padding: 11px 14px;
  text-align: left;
  vertical-align: top;
  border-style: solid;
}
th {
  background: var(--th-bg);
  color: var(--heading);
  white-space: nowrap;
  font-weight: 700;
}
tr:nth-child(even) td { background: color-mix(in srgb, var(--panel-2) 60%, transparent); }
tr:hover td { background: color-mix(in srgb, var(--mint) 30%, transparent); }

/* ========== 提示块 ========== */
.note, .warn, .tip {
  border-radius: 16px;
  padding: 16px 20px;
  margin: 20px 0;
  border: 1px solid var(--line);
  border-left-width: 5px;
  background: var(--panel);
  font-size: 16px;
  box-shadow: var(--shadow);
  transition: all .25s cubic-bezier(.34,1.56,.64,1);
}
.note:hover, .warn:hover, .tip:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}
.note { border-left-color: var(--blue); }
.warn { border-left-color: var(--orange); }
.tip  { border-left-color: var(--green); }
.note b, .warn b, .tip b { display: block; margin-bottom: 5px; }
.note b { color: var(--blue); }
.warn b { color: var(--orange); }
.tip b { color: var(--green); }

.block-title {
  font-size: 13px;
  color: var(--text-dim);
  margin: 24px 0 -6px;
  font-family: var(--mono);
  font-weight: 600;
}

/* ========== 卡片网格 ========== */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
  margin: 24px 0;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 20px 22px;
  transition: all .25s cubic-bezier(.34,1.56,.64,1);
  box-shadow: var(--shadow);
}
a.card { text-decoration: none; display: block; color: inherit; }
.card:hover {
  border-color: var(--accent);
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}
.card h3 { margin: 0 0 8px; font-size: 17px; }
.card p { margin: 0; color: var(--text-dim); font-size: 14.5px; }
.card .num {
  font-family: var(--mono);
  color: var(--pink-deep);
  font-size: 12px;
  letter-spacing: .08em;
}

/* ========== 章末导航 ========== */
.chapter-nav {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  margin-top: 60px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  font-size: 15px;
}
.chapter-nav a {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 13px 18px;
  text-decoration: none;
  color: var(--text);
  max-width: 48%;
  transition: all .25s cubic-bezier(.34,1.56,.64,1);
}
.chapter-nav a:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
  color: var(--pink-deep);
}
.chapter-nav a span { display: block; color: var(--text-dim); font-size: 12.5px; }

.foot {
  border-top: 1px solid var(--line);
  margin-top: 64px;
  padding: 24px 0;
  color: var(--text-dim);
  font-size: 14px;
  text-align: center;
}

/* ========== 首页专用 ========== */
.hero {
  text-align: center;
  padding: 44px 0 12px;
}
.hero h1 {
  font-family: var(--kawaii);
  font-size: clamp(32px, 6.5vw, 52px);
  margin: 0 0 12px;
  font-weight: 900;
}
.hero h1 .sparkle::after { content: " ✨"; }
.hero .sub {
  color: var(--text-dim);
  font-size: clamp(15px, 2.6vw, 19px);
  font-weight: 500;
}
.hero .py {
  font-family: var(--mono);
  font-size: clamp(30px, 8vw, 64px);
  background: linear-gradient(180deg, var(--accent), var(--mint));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  letter-spacing: .04em;
  font-weight: 800;
  text-shadow: 0 2px 4px rgba(255,183,197,.15);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: var(--accent-ink);
  font-weight: 700;
  padding: 12px 26px;
  border-radius: 18px;
  text-decoration: none;
  margin: 12px 7px 0;
  font-size: 15px;
  border: 1px solid transparent;
  transition: all .25s cubic-bezier(.34,1.56,.64,1);
  box-shadow: 0 4px 12px rgba(255,183,197,.22);
}
.btn:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 20px rgba(255,183,197,.35);
  filter: brightness(1.03);
}
.btn:active { transform: scale(.96); }
.btn.ghost {
  background: var(--panel);
  color: var(--pink-deep);
  border-color: var(--accent);
  box-shadow: 0 2px 6px rgba(0,0,0,.05);
}
.btn.ghost:hover {
  background: var(--panel-2);
  transform: scale(1.05);
}
.btn.sm { padding: 9px 18px; font-size: 13.5px; margin: 6px 5px 0; }

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 16px;
  margin: 30px 0;
  text-align: center;
}
.stat {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px 12px;
  box-shadow: var(--shadow);
  transition: all .25s cubic-bezier(.34,1.56,.64,1);
}
.stat:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent);
}
.stat b {
  display: block;
  font-size: 28px;
  color: var(--pink-deep);
  font-family: var(--mono);
}
.stat span { font-size: 13px; color: var(--text-dim); }

.part-head {
  margin: 44px 0 18px;
  padding: 20px 24px;
  background: color-mix(in srgb, var(--mint) 12%, transparent);
  border-left: 6px solid var(--accent);
  border-radius: 0 18px 18px 0;
  box-shadow: var(--shadow);
  transition: all .25s cubic-bezier(.34,1.56,.64,1);
}
.part-head:hover {
  border-left-color: var(--pink-deep);
  transform: translateX(4px);
}
.part-head h2 { margin: 0; border: none; padding: 0; font-size: 22px; }
.part-head p { margin: 6px 0 0; color: var(--text-dim); font-size: 14.5px; }

/* ========== 搜索页 ========== */
.search-box {
  display: flex;
  gap: 12px;
  margin: 24px 0;
  flex-wrap: wrap;
}
.search-box input {
  flex: 1 1 270px;
  padding: 13px 18px;
  font-size: 16px;
  font-family: inherit;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  transition: all .25s cubic-bezier(.34,1.56,.64,1);
}
.search-box input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(255,183,197,.2);
}

.search-meta { color: var(--text-dim); font-size: 14.5px; margin: 8px 0 18px; }

.result {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px 20px;
  margin: 12px 0;
  text-decoration: none;
  display: block;
  color: inherit;
  box-shadow: var(--shadow);
  transition: all .25s cubic-bezier(.34,1.56,.64,1);
}
.result:hover {
  border-color: var(--accent);
  transform: translateX(4px) translateY(-3px);
  box-shadow: var(--shadow-hover);
}
.result .r-title { font-weight: 700; font-size: 17px; margin-bottom: 4px; color: var(--pink-deep); }
.result .r-title mark {
  background: var(--mark-bg); color: var(--mark-text);
  border-radius: 4px; padding: 0 3px;
}
.result .r-path { font-size: 13px; color: var(--blue2); font-family: var(--mono); }
.result .r-snip {
  font-size: 14.5px; color: var(--text-dim); margin-top: 7px; line-height: 1.6;
}
.result .r-snip mark { background: var(--mark-bg); color: var(--mark-text); border-radius: 4px; }

mark { background: var(--mark-bg); color: var(--mark-text); }

/* ========== 代码运行 / 练习页 ========== */
.pg-wrap { max-width: 1200px; }
.pg-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: start;
}

.pg-pane {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 20px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow);
  transition: all .25s cubic-bezier(.34,1.56,.64,1);
}
.pg-pane:hover { box-shadow: var(--shadow-hover); }

.pg-pane > header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--panel-2);
  font-size: 14px;
  color: var(--text-dim);
  font-weight: 600;
}
.pg-pane > header .spacer { flex: 1; }

.pg-editor {
  width: 100%;
  min-height: 480px;
  resize: vertical;
  padding: 16px 18px;
  border: none;
  outline: none;
  background: var(--code-bg);
  color: var(--code-text);
  font-family: var(--mono);
  font-size: 14.5px;
  line-height: 1.75;
  tab-size: 4;
  font-weight: 400;
}
.pg-editor:focus {
  box-shadow: inset 0 0 0 3px rgba(255,183,197,.3);
}

.pg-out {
  padding: 16px 18px;
  min-height: 480px;
  max-height: 660px;
  overflow: auto;
  background: var(--code-bg);
  color: var(--code-text);
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.75;
  white-space: pre-wrap;
  word-break: break-word;
}
.pg-out .ok  { color: var(--green); }
.pg-out .err { color: var(--red); }
.pg-out .meta { color: var(--text-dim); }

.pg-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin: 16px 0; }

.pg-status {
  font-size: 13.5px;
  padding: 4px 13px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-weight: 600;
  transition: all .22s cubic-bezier(.34,1.56,.64,1);
}
.pg-status.run   { color: var(--blue2); background: color-mix(in srgb, var(--blue2) 12%, transparent); }
.pg-status.pass  { color: var(--green); background: color-mix(in srgb, var(--green) 12%, transparent); }
.pg-status.fail  { color: var(--red); background: color-mix(in srgb, var(--red) 12%, transparent); }

.snippet-list { margin: 20px 0; }
.snippet-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
  margin: 9px 0;
  flex-wrap: wrap;
  box-shadow: 0 2px 8px rgba(0,0,0,.04);
  transition: all .25s cubic-bezier(.34,1.56,.64,1);
}
.snippet-item:hover {
  transform: translateX(4px);
  border-color: var(--accent);
}
.snippet-item .t { flex: 1; min-width: 160px; font-size: 15px; font-weight: 600; }
.snippet-item .d { color: var(--text-dim); font-size: 13px; width: 100%; }

/* ========== 移动端 ========== */
.menu-toggle { display: none; }
.page-toc { display: none; }

@media (min-width: 1400px) {
  .page-toc {
    display: block;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 18px;
    padding: 16px 18px;
    margin-bottom: 22px;
    box-shadow: var(--shadow);
  }
  .page-toc h4 {
    margin: 0 0 10px;
    font-size: 13px;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--text-dim);
    font-family: var(--mono);
  }
  .page-toc a {
    display: block;
    font-size: 14px;
    color: var(--text-dim);
    text-decoration: none;
    padding: 4px 0;
    line-height: 1.5;
    transition: color .22s ease;
  }
  .page-toc a:hover { color: var(--pink-deep); }
}

@media (max-width: 1100px) {
  .pg-layout { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .layout { display: block; }
  .menu-toggle { display: inline-block; }
  .sidebar {
    position: fixed;
    top: 59px; left: 0; bottom: 0;
    width: 86vw; max-width: 340px;
    height: auto;
    z-index: 40;
    transform: translateX(-102%);
    transition: transform .25s cubic-bezier(.34,1.56,.64,1);
    box-shadow: var(--shadow);
    border-radius: 0 20px 20px 0;
  }
  .sidebar.open { transform: translateX(0); }
  .content { padding: 24px 16px 70px; }
}

@media (max-width: 720px) {
  .topbar { gap: 9px; padding: 10px 14px; }
  .topbar .logo { font-size: 15px; }
  .topbar .nav-btn:not(.menu-toggle):not(.keep-mobile) { display: none; }
  .topbar .menu-toggle { padding: 7px 11px; font-size: 13px; }
  .hero { padding: 24px 0 4px; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .grid { grid-template-columns: 1fr; }
  .chapter-nav { flex-direction: column; }
  .chapter-nav a { max-width: none; }
  h2 { font-size: 20px; }
  h3 { font-size: 18px; }
  pre { padding: 13px 15px; font-size: 13px; }
  pre code { font-size: 12.5px; }
  .lead, .note, .warn, .tip { padding: 14px 16px; }
  .pg-editor, .pg-out { min-height: 320px; font-size: 12.5px; }
}