/* 官网各页共用的样式：设计 token、基础排版，以及导航、按钮、代码块、通知卡片、页脚等公共组件 */

/* ==========================================
   设计 token
   ========================================== */

:root {
  color-scheme: light dark;

  /* 品牌色：取自 App 图标与 README 头图的白天版 */
  --sun: #FEC550;
  --sky: #A3DFFC;
  --sea: #0089C2;
  --ink: #222D3E;
  --cream: #FDF9F0;

  /* 页面底色与文字 */
  --color-bg: var(--cream);
  --color-bg-raised: #FFFFFF;
  --color-bg-sunken: #F6EFE0;
  --color-text: var(--ink);
  --color-text-secondary: #525D6F;
  --color-link: #006A96;
  --color-border: rgb(34 45 62 / 10%);
  --color-border-strong: rgb(34 45 62 / 18%);
  --color-focus: #0089C2;

  /* 按钮与版本号胶囊 */
  --color-button-bg: var(--ink);
  --color-button-bg-hover: #2E3B50;
  --color-button-text: var(--cream);
  --color-button-secondary-bg: rgb(255 255 255 / 70%);
  --color-button-secondary-bg-hover: #FFFFFF;
  --color-chip-bg: var(--sun);
  --color-chip-text: var(--ink);

  /* 图标的衬底：日黄与天蓝两种 */
  --color-tint-sun: rgb(254 197 80 / 26%);
  --color-tint-sky: rgb(163 223 252 / 42%);
  --color-icon: var(--ink);

  /* 毛玻璃：导航与通知卡片 */
  --color-glass: rgb(253 249 240 / 74%);
  --color-glass-strong: rgb(255 253 248 / 84%);

  /* 天空：各页顶部与首页收尾区的渐变，日的柔光与海浪 */
  --sky-top: #C2E9FD;
  --sky-middle: #E6F6FD;
  --sky-bottom: var(--color-bg);
  --orb-core: #FEC550;
  --orb-glow: rgb(254 197 80 / 42%);
  --wave-back: rgb(163 223 252 / 75%);
  --wave-middle: rgb(0 137 194 / 20%);

  /* 代码块：两种外观下都是深色底 */
  --color-code-bg: #1F2939;
  --color-code-text: #E9EEF6;
  --color-code-comment: #93A1B8;
  --color-code-border: transparent;
  --color-inline-code-bg: rgb(34 45 62 / 7%);

  /* 阴影 */
  --shadow-card:
    0 1px 2px rgb(34 45 62 / 5%),
    0 14px 34px -16px rgb(34 45 62 / 16%);

  --shadow-float:
    0 2px 8px rgb(22 36 60 / 8%),
    0 40px 90px -32px rgb(22 36 60 / 42%);

  --shadow-button:
    0 1px 2px rgb(34 45 62 / 18%),
    0 8px 18px -8px rgb(34 45 62 / 36%);

  /* 字体：只用系统字体 */
  --font-sans:
    -apple-system,
    BlinkMacSystemFont,
    "SF Pro Text",
    "Helvetica Neue",
    "PingFang SC",
    "Hiragino Sans GB",
    "Microsoft YaHei",
    sans-serif;

  --font-mono:
    ui-monospace,
    "SF Mono",
    Menlo,
    monospace;

  /* 尺寸 */
  --gutter: clamp(16px, 4vw, 40px);
  --content-width: 1200px;
  --nav-height: 64px;
  --radius-small: 10px;
  --radius-medium: 16px;
  --radius-large: 24px;
  --section-space: clamp(96px, 11vw, 160px);

  /* 正文一行的最大宽度：英文一行约 70 个字符，中文一行约 30 个字 */
  --measure: 50ch;

  /* 动效曲线 */
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.32, 0.64, 1);
}

/* 深色：夜间版的夜蓝底与月光 */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #031536;
    --color-bg-raised: #0A2246;
    --color-bg-sunken: #041B3E;
    --color-text: #F5F7FC;
    --color-text-secondary: #B3C1DA;
    --color-link: #B4DAF7;
    --color-border: rgb(180 218 247 / 12%);
    --color-border-strong: rgb(180 218 247 / 22%);
    --color-focus: #B4DAF7;

    --color-button-bg: #F5F7FC;
    --color-button-bg-hover: #FFFFFF;
    --color-button-text: #031536;
    --color-button-secondary-bg: rgb(180 218 247 / 10%);
    --color-button-secondary-bg-hover: rgb(180 218 247 / 17%);
    --color-chip-bg: #0B4B8D;
    --color-chip-text: #F5F7FC;

    --color-tint-sun: rgb(254 197 80 / 14%);
    --color-tint-sky: rgb(180 218 247 / 14%);
    --color-icon: #DDEBFA;

    --color-glass: rgb(3 21 54 / 70%);
    --color-glass-strong: rgb(12 36 74 / 80%);

    --sky-top: #020D25;
    --sky-middle: #05214A;
    --sky-bottom: #0A2E5E;
    --orb-core: #EAF5FF;
    --orb-glow: rgb(180 218 247 / 26%);
    --wave-back: rgb(11 75 141 / 80%);
    --wave-middle: rgb(180 218 247 / 13%);

    --color-code-bg: #020E27;
    --color-code-text: #E3EAF6;
    --color-code-comment: #8597B6;
    --color-code-border: rgb(180 218 247 / 12%);
    --color-inline-code-bg: rgb(180 218 247 / 12%);

    --shadow-card:
      0 1px 2px rgb(0 0 0 / 28%),
      0 16px 38px -16px rgb(0 0 0 / 55%);

    --shadow-float:
      0 2px 8px rgb(0 0 0 / 30%),
      0 40px 100px -30px rgb(0 0 0 / 72%);

    --shadow-button:
      0 1px 2px rgb(0 0 0 / 30%),
      0 8px 20px -8px rgb(0 0 0 / 55%);
  }
}

/* ==========================================
   基础样式
   ========================================== */

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

html {
  scroll-padding-top: calc(var(--nav-height) + 24px);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

/* 内容不满一屏时，页脚仍贴在底部 */
body {
  display: flex;
  flex-direction: column;
  margin: 0;
  min-height: 100vh;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* 中文的字面更满，行高再放松一些 */
body:lang(zh) {
  line-height: 1.8;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
figure,
blockquote {
  margin: 0;
}

ul,
ol {
  padding: 0;
}

main {
  flex: 1;
}

/* 标题各行长短均衡，不把一两个字甩到下一行；正文避免末行只剩一两个字 */
h1,
h2,
h3,
h4 {
  text-wrap: balance;
}

p,
li,
summary {
  text-wrap: pretty;
}

/* 中文标题只在标点与空格处换行，不把一个词拆到两行；一行放不下时才在字间断开 */
:lang(zh) :is(h1, h2, h3, h4) {
  word-break: keep-all;
  overflow-wrap: anywhere;
}

img,
svg,
picture {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

/* `hidden` 优先于组件自己的 display */
[hidden] {
  display: none !important;
}

a {
  color: var(--color-link);
  text-decoration-line: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: color-mix(in srgb, currentColor 40%, transparent);
  text-underline-offset: 0.22em;
  transition: text-decoration-color 0.2s;
}

a:hover {
  text-decoration-color: currentColor;
}

strong {
  font-weight: 650;
}

code {
  padding: 0.12em 0.4em;
  border-radius: 6px;
  background: var(--color-inline-code-bg);
  font-family: var(--font-mono);
  font-size: 0.88em;
  overflow-wrap: anywhere;
}

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: 6px;
}

::selection {
  background: color-mix(in srgb, var(--sky) 70%, transparent);
  color: var(--ink);
}

/* 只给读屏软件看的文字 */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* 内联 SVG 图标的 symbol 定义，本身不占位置 */
.icon-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.icon {
  flex: none;
  width: 1.25em;
  height: 1.25em;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.container {
  width: min(100% - 2 * var(--gutter), var(--content-width));
  margin-inline: auto;
}

/* 跳到正文：平时藏在视口外，键盘聚焦时出现在左上角 */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  padding: 10px 16px;
  border-radius: 999px;
  background: var(--color-button-bg);
  color: var(--color-button-text);
  font-weight: 600;
  text-decoration: none;
  transform: translateY(-160%);
  transition: transform 0.2s var(--ease-out);
}

.skip-link:focus-visible {
  transform: none;
}

/* ==========================================
   通用排版
   ========================================== */

.section {
  position: relative;
  padding-block: var(--section-space);
}

.section-header {
  display: grid;
  gap: 18px;
  max-width: 56rem;
  margin-bottom: clamp(48px, 6vw, 80px);
}

.eyebrow {
  color: var(--color-link);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* 中文没有大小写，也不需要加宽字距 */
:lang(zh) .eyebrow {
  letter-spacing: 0;
}

.section-title {
  font-size: clamp(2rem, 1.3rem + 2.6vw, 3.25rem);
  font-weight: 760;
  line-height: 1.12;
  letter-spacing: -0.028em;
  text-wrap: balance;
}

:lang(zh) .section-title {
  line-height: 1.3;
  letter-spacing: 0;
}

.subsection-title {
  font-size: clamp(1.5rem, 1.2rem + 1vw, 2rem);
  font-weight: 720;
  line-height: 1.25;
  letter-spacing: -0.018em;
}

:lang(zh) .subsection-title {
  letter-spacing: 0;
}

.lead {
  max-width: var(--measure);
  color: var(--color-text-secondary);
  font-size: clamp(1.125rem, 1.05rem + 0.35vw, 1.3125rem);
  line-height: 1.65;
}

:lang(zh) .lead {
  line-height: 1.8;
}

/* 用 “·” 隔开的一行短信息，如系统要求 */
.meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 0;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
}

.meta-line > * + *::before {
  content: "·";
  margin-inline: 0.6em;
  opacity: 0.7;
}

/* 窄屏放不下一行时逐条竖排，免得 “·” 落到行首 */
@media (max-width: 639px) {
  .meta-line {
    flex-direction: column;
    gap: 2px;
  }

  .meta-line > * + *::before {
    content: none;
  }
}

/* 带对勾的要点列表 */
.check-list {
  display: grid;
  gap: 12px;
  max-width: var(--measure);
  list-style: none;
}

.check-list li {
  position: relative;
  padding-left: 30px;
}

.check-list li::before {
  content: "";
  position: absolute;
  top: 0.42em;
  left: 2px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23222D3E' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 12.5 4 4 8-8.5'/%3E%3C/svg%3E") center / 12px no-repeat,
    var(--color-tint-sun);
}

@media (prefers-color-scheme: dark) {
  .check-list li::before {
    background:
      url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23F5F7FC' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 12.5 4 4 8-8.5'/%3E%3C/svg%3E") center / 12px no-repeat,
      var(--color-tint-sky);
  }
}

/* 图标的圆角衬底 */
.icon-box {
  display: grid;
  flex: none;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 13px;
  color: var(--color-icon);
}

.icon-box .icon {
  width: 24px;
  height: 24px;
}

.icon-box-sun {
  background: var(--color-tint-sun);
}

.icon-box-sky {
  background: var(--color-tint-sky);
}

/* 截图外框：圆角、细描边与柔和的投影 */
.screenshot {
  border-radius: var(--radius-medium);
  box-shadow:
    0 0 0 1px var(--color-border),
    var(--shadow-float);
}

/* ==========================================
   天空页头：各页顶部的天空渐变与底边的海浪
   ========================================== */

/* 天空一直铺到导航底下：页头向上挪出导航的高度，上下内边距由各页自定 */
.hero {
  position: relative;
  isolation: isolate;
  margin-top: calc(-1 * var(--nav-height));
  overflow: clip;
}

.hero-sky {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(
    180deg,
    var(--sky-top) 0%,
    var(--sky-middle) 52%,
    var(--sky-bottom) 100%
  );
}

/* 底边的三层海浪，各自以不同的速度缓慢漂动；最前一层与页面底色相同，把页头接进下一个区块 */
.hero-waves {
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: clamp(72px, 9vw, 132px);
}

.wave {
  transform-box: fill-box;
}

.wave-back {
  fill: var(--wave-back);
}

.wave-middle {
  fill: var(--wave-middle);
}

.wave-front {
  fill: var(--color-bg);
}

@media (prefers-reduced-motion: no-preference) {
  .wave {
    animation: wave-drift linear infinite;
  }

  .wave-back {
    animation-duration: 48s;
  }

  .wave-middle {
    animation-duration: 32s;
    animation-direction: reverse;
  }

  .wave-front {
    animation-duration: 22s;
  }
}

@keyframes wave-drift {
  to {
    transform: translateX(-50%);
  }
}

/* 下载页、更新日志页的页头：居中的图标、大标题与一两行说明 */
.page-hero {
  padding-top: calc(var(--nav-height) + clamp(40px, 6vw, 88px));
  padding-bottom: clamp(140px, 15vw, 210px);
  text-align: center;
}

.page-hero-inner {
  display: grid;
  justify-items: center;
  gap: 14px;
}

/* 图标后面一团日或月的柔光 */
.page-hero-icon {
  position: relative;
  isolation: isolate;
  margin-bottom: 12px;
}

.page-hero-icon::before {
  content: "";
  position: absolute;
  inset: -50%;
  z-index: -1;
  border-radius: 50%;
  background: radial-gradient(circle, var(--orb-glow) 0%, transparent 64%);
}

.page-hero-icon img {
  width: 128px;
  height: 128px;
  filter: drop-shadow(0 18px 28px rgb(22 36 60 / 22%));
}

.page-title {
  font-size: clamp(2.5rem, 1.7rem + 3vw, 4.25rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.page-title:lang(zh) {
  font-weight: 760;
  line-height: 1.25;
  letter-spacing: 0.01em;
}

.page-lead {
  max-width: var(--measure);
  color: var(--color-text-secondary);
  font-size: clamp(1.0625rem, 1rem + 0.3vw, 1.25rem);
  line-height: 1.65;
}

:lang(zh) .page-lead {
  line-height: 1.8;
}

/* 窄屏逐条竖排时也居中 */
.page-meta {
  align-items: center;
  justify-content: center;
}

.page-hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 12px;
}

/* 帆船画稿裁成圆形、边缘淡入底色：更新日志的空状态与 404 页共用 */
.ship-art {
  width: min(280px, 70vw);
  aspect-ratio: 1;
  border-radius: 50%;
  overflow: clip;
  -webkit-mask-image: radial-gradient(circle, #000 56%, transparent 71%);
  mask-image: radial-gradient(circle, #000 56%, transparent 71%);
}

.ship-art img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* 图标像面板弹出那样从底边放大淡入，与首页的截图一致 */
@media (prefers-reduced-motion: no-preference) {
  .page-hero-icon img {
    transform-origin: 50% 100%;
    animation: icon-pop 0.8s var(--ease-spring) 0.1s both;
  }

  .page-hero-inner > :not(.page-hero-icon) {
    animation: page-copy-in 0.8s var(--ease-out) both;
  }
}

@keyframes icon-pop {
  from {
    opacity: 0;
    transform: scale(0.85);
  }
}

@keyframes page-copy-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
}

/* ==========================================
   截图底板与折叠的问答
   ========================================== */

/* 截图放在一块带天空色的圆角底板上 */
.feature-media {
  display: grid;
  place-items: center;
  padding: clamp(20px, 4vw, 52px);
  border-radius: 32px;
  background:
    radial-gradient(
      circle at 85% 10%,
      var(--color-tint-sun),
      transparent 55%
    ),
    linear-gradient(160deg, var(--color-tint-sky), transparent 75%),
    var(--color-bg-sunken);
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: 18px;
  background: var(--color-bg-raised);
  transition: box-shadow 0.3s;
  interpolate-size: allow-keywords;
}

.faq-item[open] {
  box-shadow: var(--shadow-card);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 24px;
  border-radius: 18px;
  font-size: 1.0625rem;
  font-weight: 620;
  line-height: 1.5;
  list-style: none;
  cursor: pointer;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-chevron {
  color: var(--color-text-secondary);
  transition: transform 0.3s var(--ease-out);
}

.faq-item[open] .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  display: grid;
  gap: 12px;
  padding: 0 24px 24px;
  color: var(--color-text-secondary);
}

.faq-answer > * {
  max-width: var(--measure);
}

.faq-answer ul {
  display: grid;
  gap: 8px;
  padding-left: 1.25em;
}

/* 支持的浏览器里，展开与收起时高度平滑过渡 */
@supports (interpolate-size: allow-keywords) {
  .faq-item::details-content {
    height: 0;
    overflow: clip;
    transition:
      height 0.35s var(--ease-out),
      content-visibility 0.35s allow-discrete;
  }

  .faq-item[open]::details-content {
    height: auto;
  }
}

@media (max-width: 639px) {
  .faq-item summary {
    padding: 18px 20px;
  }

  .faq-answer {
    padding: 0 20px 22px;
  }
}

/* ==========================================
   按钮与胶囊
   ========================================== */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55em;
  min-height: 44px;
  padding: 0 20px;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 620;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition:
    transform 0.25s var(--ease-out),
    background-color 0.2s,
    box-shadow 0.25s var(--ease-out);
}

.button:active {
  transform: scale(0.98);
}

.button-primary {
  background: var(--color-button-bg);
  color: var(--color-button-text);
  box-shadow: var(--shadow-button);
}

.button-primary:hover {
  background: var(--color-button-bg-hover);
}

.button-secondary {
  background: var(--color-button-secondary-bg);
  color: var(--color-text);
  box-shadow: inset 0 0 0 1px var(--color-border-strong);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.button-secondary:hover {
  background: var(--color-button-secondary-bg-hover);
}

.button-large {
  min-height: 54px;
  padding: 0 26px;
  font-size: 1.0625rem;
}

.button-small {
  min-height: 36px;
  padding: 0 16px;
  font-size: 0.875rem;
}

@media (hover: hover) {
  .button:hover {
    transform: translateY(-1px);
  }

  .button:active {
    transform: scale(0.98);
  }
}

.version-chip {
  display: inline-flex;
  align-items: center;
  margin-right: -10px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--color-chip-bg);
  color: var(--color-chip-text);
  font-size: 0.8125rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

/* 卡片底部的文字链接 */
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45em;
  font-weight: 600;
  text-decoration: none;
}

.card-link:hover {
  text-decoration: underline;
}

.card-link .icon {
  width: 1.1em;
  height: 1.1em;
}

/* ==========================================
   发版数据决定显示哪一组内容
   ========================================== */

/*
  `data-when` 写明元素在哪些状态下显示：
  latest 有正式版本；none 还没有正式版本；unknown 没有脚本、正在读取或读取失败，退回到 GitHub 链接
*/
html[data-release="latest"]
  [data-when]:not([data-when~="latest"]),
html[data-release="none"]
  [data-when]:not([data-when~="none"]),
html:not([data-release="latest"], [data-release="none"])
  [data-when]:not([data-when~="unknown"]) {
  display: none;
}

/* 读取期间先藏起这些元素，免得从 GitHub 链接闪成下载按钮；脚本迟迟没有结果时，两秒后照常显示 */
html.js:not([data-release]) [data-when] {
  visibility: hidden;
  animation: release-fallback 0s 2s forwards;
}

@keyframes release-fallback {
  to {
    visibility: visible;
  }
}

/* ==========================================
   导航
   ========================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  view-transition-name: site-header;
  border-bottom: 1px solid transparent;
  transition:
    background-color 0.3s,
    border-color 0.3s,
    -webkit-backdrop-filter 0.3s,
    backdrop-filter 0.3s;
}

/* 滚动后或菜单展开时换成毛玻璃，并出现细分隔线；没有脚本时一直是毛玻璃 */
.site-header.is-scrolled,
.site-header.is-open,
html:not(.js) .site-header {
  border-bottom-color: var(--color-border);
  background: var(--color-glass);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
}

/*
  导航自身带 backdrop-filter 或 view-transition-name 时，里面的窄屏菜单模糊不到底下的正文，文字会直接透出来：
  菜单展开时去掉这两项，导航的毛玻璃改画在伪元素上；点了菜单里的链接会先收起菜单，页面过渡照常
*/
.site-header.is-open {
  view-transition-name: none;
  background: none;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}

.site-header.is-open::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--color-glass);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  backdrop-filter: saturate(180%) blur(20px);
}

.nav {
  display: flex;
  align-items: center;
  gap: 12px;
  height: var(--nav-height);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  font-size: 1.125rem;
  font-weight: 720;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.brand img {
  width: 32px;
  height: 32px;
}

.nav-menu {
  display: flex;
  flex: 1;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-links a,
.language-switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 36px;
  padding: 0 12px;
  border-radius: 999px;
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  font-weight: 520;
  text-decoration: none;
  transition:
    color 0.2s,
    background-color 0.2s;
}

.nav-links a:hover,
.language-switch:hover {
  background: var(--color-inline-code-bg);
  color: var(--color-text);
}

/* 当前所在的区块或页面 */
.nav-links a.is-active,
.nav-links a[aria-current="page"] {
  background: var(--color-inline-code-bg);
  color: var(--color-text);
}

.nav-links .icon,
.language-switch .icon {
  width: 17px;
  height: 17px;
}

.language-switch {
  margin-right: 4px;
  cursor: pointer;
  list-style: none;
}

.language-switch::-webkit-details-marker {
  display: none;
}

/* 两处语言入口共用选项列表，浮层跟随所在入口定位 */
.language-menu {
  position: relative;
}

.language-chevron {
  transition: transform 0.2s;
}

.language-menu[open] .language-chevron {
  transform: rotate(180deg);
}

.language-options {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 10;
  min-width: 180px;
  padding: 6px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background: var(--color-bg-raised);
  box-shadow: var(--shadow-card);
  list-style: none;
}

.language-options a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 44px;
  padding: 8px 12px;
  border-radius: var(--radius-small);
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  text-decoration: none;
}

.language-options a:hover,
.language-options a[aria-current="true"] {
  background: var(--color-inline-code-bg);
  color: var(--color-text);
}

.language-options .icon {
  width: 16px;
  height: 16px;
}

.nav-toggle {
  display: none;
  place-items: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
}

.nav-toggle .icon {
  width: 22px;
  height: 22px;
}

.nav-toggle:hover {
  background: var(--color-inline-code-bg);
}

/* 窄屏：链接与语言切换收进菜单按钮，展开后在导航下方铺开 */
@media (max-width: 899px) {
  /*
    菜单按钮在 DOM 里紧挨在菜单之前，展开后按 Tab 先进入菜单；
    视觉上与 DOM 同序：菜单按钮推到右侧，下载按钮在它后面、排在最右
  */
  .nav-toggle {
    display: grid;
    margin-left: auto;
  }

  .nav-menu {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 12px var(--gutter) 20px;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-glass);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    backdrop-filter: saturate(180%) blur(20px);
  }

  .site-header.is-open .nav-menu {
    display: flex;
    animation: menu-in 0.3s var(--ease-out);
  }

  .nav-links {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-links a,
  .language-switch {
    min-height: 48px;
    padding: 0 14px;
    border-radius: 12px;
    font-size: 1.0625rem;
  }

  .language-switch {
    margin-right: 0;
  }

  /* 窄屏导航中的语言列表随菜单排版，避免浮层超出导航底部 */
  .nav-menu .language-options {
    position: static;
    margin-top: 4px;
    box-shadow: none;
  }

  /* 没有脚本时菜单按钮不起作用，链接直接排在导航下方 */
  html:not(.js) .nav {
    flex-wrap: wrap;
    height: auto;
    min-height: var(--nav-height);
  }

  html:not(.js) .nav-toggle {
    display: none;
  }

  /* 没有菜单按钮时，下载按钮自己推到右侧 */
  html:not(.js) .nav-download {
    margin-left: auto;
  }

  html:not(.js) .nav-menu {
    position: static;
    display: flex;
    flex-basis: 100%;
    flex-direction: row;
    flex-wrap: wrap;
    padding: 0 0 12px;
    border: 0;
    background: none;
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }

  html:not(.js) .nav-links {
    flex-direction: row;
    flex-wrap: wrap;
  }
}

@keyframes menu-in {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
}

/* ==========================================
   代码块与复制按钮
   ========================================== */

.code-block {
  position: relative;
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-medium);
  background: var(--color-code-bg);
  color: var(--color-code-text);
}

.code-block pre {
  margin: 0;
  padding: 20px 22px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.75;
}

/* 有复制按钮时给右上角留出位置 */
html.js .code-block pre {
  padding-right: 112px;
}

.code-block code {
  padding: 0;
  background: none;
  font-size: inherit;
  overflow-wrap: normal;
}

.code-comment {
  color: var(--color-code-comment);
}

.code-prompt {
  color: var(--color-code-comment);
  user-select: none;
}

.copy-button {
  position: absolute;
  top: 12px;
  right: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 34px;
  padding: 0 12px;
  border: 1px solid rgb(255 255 255 / 14%);
  border-radius: 999px;
  background: rgb(255 255 255 / 8%);
  color: var(--color-code-text);
  font: inherit;
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s;
}

.copy-button:hover {
  background: rgb(255 255 255 / 16%);
}

.copy-button .icon {
  width: 16px;
  height: 16px;
}

/* 复制按钮只在有脚本时出现 */
html:not(.js) .copy-button {
  display: none;
}

/* 窄屏：命令常要横向滚动，复制按钮挪到代码上方单独一行，免得压住命令 */
@media (max-width: 639px) {
  .code-block {
    display: flex;
    flex-direction: column;
  }

  .copy-button {
    position: relative;
    top: auto;
    right: auto;
    order: -1;
    align-self: flex-end;
    margin: 10px 10px -8px;
  }

  html.js .code-block pre {
    padding-right: 22px;
  }
}

/* 复制成功后按钮旁浮出的提示 */
.copy-toast {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 5;
  width: max-content;
  max-width: min(320px, 80vw);
  padding: 8px 12px;
  border-radius: 10px;
  background: var(--color-button-bg);
  color: var(--color-button-text);
  font-size: 0.8125rem;
  font-weight: 560;
  line-height: 1.4;
  white-space: normal;
  box-shadow: var(--shadow-card);
  pointer-events: none;
  animation: copy-toast-in 0.25s var(--ease-out);
}

@keyframes copy-toast-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
}

/* ==========================================
   下载后的通知卡片
   ========================================== */

.download-toast {
  position: fixed;
  inset: calc(var(--nav-height) + 12px) 16px auto auto;
  z-index: 100;
  width: min(380px, 100vw - 32px);
  max-width: none;
  margin: 0;
  padding: 16px 18px 18px;
  border: 1px solid var(--color-border);
  border-radius: 22px;
  background: var(--color-glass-strong);
  color: var(--color-text);
  box-shadow: var(--shadow-float);
  -webkit-backdrop-filter: saturate(180%) blur(28px);
  backdrop-filter: saturate(180%) blur(28px);
}

.download-toast[open] {
  display: grid;
  gap: 14px;
  animation: toast-in 0.55s var(--ease-spring);
}

.toast-header {
  display: flex;
  align-items: center;
  gap: 12px;
}

.toast-icon {
  width: 40px;
  height: 40px;
}

.toast-heading {
  flex: 1;
  min-width: 0;
}

.toast-app {
  color: var(--color-text-secondary);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.4;
  text-transform: uppercase;
}

:lang(zh) .toast-app {
  letter-spacing: 0;
}

.toast-title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.35;
}

.toast-close {
  display: grid;
  place-items: center;
  align-self: flex-start;
  width: 30px;
  height: 30px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: var(--color-inline-code-bg);
  color: var(--color-text-secondary);
  cursor: pointer;
}

.toast-close:hover {
  color: var(--color-text);
}

.toast-close .icon {
  width: 16px;
  height: 16px;
}

.toast-steps {
  display: grid;
  gap: 8px;
  counter-reset: toast-step;
  font-size: 0.9375rem;
  line-height: 1.5;
  list-style: none;
}

/* 序号绝对定位在左侧：步骤里的文字与 code、strong 照常排成一行，不被拆成弹性项目 */
.toast-steps li {
  position: relative;
  padding-left: 32px;
  counter-increment: toast-step;
}

.toast-steps li::before {
  content: counter(toast-step);
  position: absolute;
  top: 0.06em;
  left: 0;
  display: grid;
  place-items: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-tint-sun);
  font-size: 0.75rem;
  font-weight: 700;
}

.toast-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 40px;
  border-radius: 12px;
  background: var(--color-inline-code-bg);
  color: var(--color-text);
  font-size: 0.9375rem;
  font-weight: 620;
  text-decoration: none;
}

.toast-link:hover {
  background: var(--color-border-strong);
}

.toast-link .icon {
  width: 16px;
  height: 16px;
}

/* 窄屏：卡片贴在屏幕底部 */
@media (max-width: 639px) {
  .download-toast {
    inset: auto 16px 16px;
    width: auto;
  }

  .download-toast[open] {
    animation-name: toast-in-bottom;
  }
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateX(24px) scale(0.98);
  }
}

@keyframes toast-in-bottom {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
}

/* ==========================================
   页脚
   ========================================== */

.site-footer {
  padding-block: 64px 40px;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-sunken);
  font-size: 0.9375rem;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 48px;
}

.footer-brand {
  display: grid;
  gap: 12px;
  align-content: start;
}

.footer-brand p {
  color: var(--color-text-secondary);
}

.footer-columns {
  display: flex;
  flex-wrap: wrap;
  gap: 48px clamp(48px, 8vw, 120px);
}

.footer-column h2 {
  margin-bottom: 14px;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

:lang(zh) .footer-column h2 {
  letter-spacing: 0;
}

.footer-column ul {
  display: grid;
  gap: 10px;
  list-style: none;
}

.footer-column a {
  color: var(--color-text-secondary);
  text-decoration: none;
}

.footer-column a:hover {
  color: var(--color-text);
  text-decoration: underline;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

/* 版权文案换行时，语言入口仍靠右，浮层保持在视口内 */
.footer-bottom .language-menu {
  margin-left: auto;
}

.footer-bottom .language-switch {
  margin-right: -12px;
}

/* 页脚入口向上展开，选项保持在页面可见范围内 */
.footer-bottom .language-options {
  top: auto;
  bottom: calc(100% + 8px);
}

/* ==========================================
   区块进入视口时淡入上移
   ========================================== */

@media (prefers-reduced-motion: no-preference) {
  html.js .reveal {
    opacity: 0;
    transform: translateY(28px);
    transition:
      opacity 0.9s var(--ease-out),
      transform 0.9s var(--ease-out);
  }

  /* site.js 没能运行时，几秒后由动画把内容显示出来；它运行后在 <html> 上加 `reveal-ready`，改由它逐个淡入 */
  html.js:not(.reveal-ready) .reveal {
    animation: reveal-fallback 0.9s var(--ease-out) 3s forwards;
  }

  html.js .reveal.is-visible {
    opacity: 1;
    transform: none;
  }

  /* 同一行并排的卡片依次错开一点出现 */
  html.js .reveal:nth-child(3n + 2) {
    transition-delay: 80ms;
  }

  html.js .reveal:nth-child(3n) {
    transition-delay: 160ms;
  }
}

@keyframes reveal-fallback {
  to {
    opacity: 1;
    transform: none;
  }
}

/* ==========================================
   页面之间的过渡与减弱动效
   ========================================== */

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }

  @view-transition {
    navigation: auto;
  }
}

/* 系统开了 “减弱动态效果” 时关闭所有动效 */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}