/* ============================================================
   全站共用顶部导航（site-nav）样式
   版式：深色条 + 左侧 logo（∞ 图形 + NTKRIB 字标）+ 右侧 6 个栏目直排
   不再使用"Menu 展开侧滑面板"的隐藏式导航
   用法：页面放 <div id="reactbits-header"></div> + 本文件 + js/site-nav.js
   ============================================================ */

/* 顶栏高度「唯一来源」：内容让位值（padding-top）一律引用本变量。
   ⚠️ 别在别处再硬编码 76/66 —— 手机上顶栏是 66px，写 76 会在导航与首屏之间漏出 10px 白缝
   （2026-09-15 用户「顶部导航栏和黑色背景之间有条白色的间距，这是个 BUG」）。 */
:root { --site-nav-h: 76px; }

#reactbits-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  pointer-events: none;
}
#reactbits-header > * { pointer-events: auto; }

#reactbits-header .site-header {
  background: rgba(0, 0, 0, .86);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, .08);
}
#reactbits-header .sh-inner {
  height: var(--site-nav-h);
  padding: 0 max(32px, 4vw);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

/* —— 左侧 logo —— */
#reactbits-header .sh-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex: 0 0 auto;
}
#reactbits-header .sh-mark {
  display: block;
  width: auto;
  height: 30px;
}
#reactbits-header .sh-word {
  color: #fff;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: .12em;
  line-height: 1;
}

/* —— 右侧栏目：直接显示，不需要点击展开 —— */
#reactbits-header .sh-nav {
  display: flex;
  align-items: center;
  gap: 34px;
  min-width: 0;
}
#reactbits-header .sh-nav a {
  color: rgba(255, 255, 255, .78);
  font-size: 14px;
  line-height: 1;
  font-weight: 500;
  text-decoration: none;
  padding: 8px 0;
  white-space: nowrap;
  transition: color .25s ease;
}
#reactbits-header .sh-nav a:hover { color: #fff; }
#reactbits-header .sh-nav a[aria-current="page"] {
  color: #fff;
  box-shadow: inset 0 -2px 0 0 #954fec;
}
/* 语言互跳（2026-10-15 英文站上线）：与栏目同排，但用描边小胶囊区分，
   不与栏目抢视觉权重 */
#reactbits-header .sh-nav a.sh-lang {
  padding: 5px 12px;
  border: 1px solid rgba(255, 255, 255, .32);
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .04em;
}
#reactbits-header .sh-nav a.sh-lang:hover {
  border-color: #fff;
  background: rgba(255, 255, 255, .1);
}

/* 首页旧导航（被现导航取代）彻底隐藏 */
body.has-site-nav .proto-header { display: none; }

/* 导航是 fixed 的：内页正文补顶部间距（首页不加，导航叠在 hero 上） */
body.has-site-nav .page-main { padding-top: var(--site-nav-h); }
body.has-site-nav .commerce-main { padding-top: 140px; }
body.has-site-nav .nl-main { padding-top: calc(var(--site-nav-h) + 60px); }
body.has-site-nav .nd-main { padding-top: calc(var(--site-nav-h) + 60px); }

@media (max-width: 900px) {
  /* 手机端顶栏 66px：变量改这里，全站让位值跟着变 */
  :root { --site-nav-h: 66px; }
  #reactbits-header .sh-inner { height: var(--site-nav-h); padding: 0 20px; gap: 16px; }
  #reactbits-header .sh-mark { height: 24px; }
  #reactbits-header .sh-word { font-size: 15px; letter-spacing: .1em; }
  #reactbits-header .sh-nav {
    gap: 20px;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  #reactbits-header .sh-nav::-webkit-scrollbar { display: none; }
  #reactbits-header .sh-nav a { font-size: 13px; }

  body.has-site-nav .nl-main,
  body.has-site-nav .nd-main { padding-top: calc(var(--site-nav-h) + 42px); }
}
@media (max-width: 640px) {
  body.has-site-nav .page-main { padding-top: var(--site-nav-h); }
  body.has-site-nav .commerce-main { padding-top: 140px; }
  #reactbits-header .sh-word { display: none; }
}

/* ============================================================
   手机端导航：复刻线上 ntkrib.com 的 StaggeredMenu（2026-09-12 用户「复刻这个 https://ntkrib.com/」）
   线上实测规格：顶栏 66px（logo 112px + “Menu/Close” 翻转 + “+” 图标）→ 点开
   ① 两层品牌紫幕布从右滑入（#954fec，第二层 #584cd6 延迟 .1s）
   ② 白色面板推进来（#f7f7f8，min(88vw,420px)，延迟 .15s，圆角 0、左边缘齐屏）
   ③ 大号编号栏目逐条上浮（56px，编号 01… 18px #584cd6，逐条延迟 .1s，ease 很陡）
   面板打开时顶栏透明、字标反色（因为白面板滑到了它下面）。
   本文件手写等价样式（不引 983KB 的 reactbits 包）；DOM 结构见 js/site-nav.js。
   ============================================================ */
@property --sm-num-opacity { syntax: '<number>'; inherits: true; initial-value: 0; }

#reactbits-header .staggered-menu-wrapper {
  display: none; position: fixed; inset: 0;
  width: 100vw; height: 100vh; z-index: 90;
  overflow: hidden; pointer-events: none;
}

@media (max-width: 900px) {
  #reactbits-header .site-header { display: none; }     /* 直排顶栏让位给下面这套 */
  #reactbits-header .staggered-menu-wrapper { display: block; }

  /* —— 顶栏：logo + Menu —— */
  #reactbits-header .staggered-menu-header {
    position: absolute; top: 0; left: 0; width: 100%; height: var(--site-nav-h); padding: 0 20px;
    display: flex; align-items: center; justify-content: space-between;
    background: rgba(0, 0, 0, .86);
    -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, .08);
    z-index: 20; pointer-events: none;
    transition: background .3s, border-color .3s;
  }
  #reactbits-header .staggered-menu-header > * { pointer-events: auto; }
  /* 2026-09-12 用户「手机端 LOGO 是错的」：手机顶栏锁版改成与 PC 逐项一致
     （gap 12 / ∞ 图形高 30px / 字标 17px、800、letter-spacing .12em，同 .sh-brand 那套）。 */
  #reactbits-header .sm-logo { display: flex; align-items: center; gap: 12px; text-decoration: none; -webkit-user-select: none; user-select: none; }
  #reactbits-header .sm-logo-mark { display: block; width: auto; height: 30px; }
  #reactbits-header .sm-logo-word { color: #fff; font-size: 17px; font-weight: 800; letter-spacing: .12em; line-height: 1; }
  #reactbits-header .sm-logo-img { display: block; width: 112px; height: auto; object-fit: contain; transition: filter .3s; }   /* 旧 SVG 方案留档，已不用 */

  #reactbits-header .sm-toggle {
    position: relative; display: inline-flex; align-items: center; gap: .3rem;
    padding: 12px 0; border: 0; background: none; color: #e9e9ef;
    font-family: inherit; font-size: 13px; font-weight: 500; line-height: 1; cursor: pointer;
  }
  #reactbits-header .sm-toggle:focus-visible { outline: 2px solid #954fec; outline-offset: 4px; border-radius: 4px; }
  #reactbits-header .sm-toggle-textWrap { position: relative; display: inline-block; height: 1em; overflow: hidden; white-space: nowrap; }
  #reactbits-header .sm-toggle-textInner { display: flex; flex-direction: column; line-height: 1; transform: translateY(-80%); transition: transform .5s cubic-bezier(.16, 1, .3, 1); }
  #reactbits-header .sm-toggle-line { display: block; height: 1em; line-height: 1; }
  #reactbits-header .sm-icon { position: relative; flex: 0 0 14px; width: 14px; height: 14px; display: inline-flex; align-items: center; justify-content: center; }
  #reactbits-header .sm-icon-line { position: absolute; top: 50%; left: 50%; width: 100%; height: 2px; background: currentColor; border-radius: 2px; transform: translate(-50%, -50%); transition: transform .4s cubic-bezier(.16, 1, .3, 1); }
  #reactbits-header .sm-icon-line-v { transform: translate(-50%, -50%) rotate(90deg); }

  /* —— 幕布：两层品牌紫 —— */
  #reactbits-header .sm-prelayers { position: absolute; top: 0; bottom: 0; right: 0; width: min(88vw, 420px); z-index: 5; pointer-events: none; }
  #reactbits-header .sm-prelayer { position: absolute; top: 0; right: 0; width: 100%; height: 100%; transform: translate(100%, 0); transition: transform .55s cubic-bezier(.16, 1, .3, 1); }
  #reactbits-header .sm-prelayer + .sm-prelayer { transition-delay: .1s; }

  /* —— 白色面板 —— */
  #reactbits-header .staggered-menu-panel {
    position: absolute; top: 0; right: 0; width: min(88vw, 420px); height: 100%;
    padding: 96px 32px 32px; background: #f7f7f8; color: #141416;
    display: flex; flex-direction: column; overflow-y: auto;
    transform: translateX(100%);
    transition: transform .55s cubic-bezier(.16, 1, .3, 1) .15s;
    z-index: 10; pointer-events: auto;
  }
  #reactbits-header .sm-panel-inner { display: flex; flex-direction: column; flex: 1; gap: 1.25rem; }
  /* 2026-09-12 用户「每个栏目上下之间要有间距」：栏目间距 .5rem → 1.4rem（≈22px） */
  #reactbits-header .sm-panel-list { display: flex; flex-direction: column; gap: 1.4rem; margin: 0; padding: 0; list-style: none; counter-reset: smItem; }
  #reactbits-header .sm-panel-itemWrap { position: relative; overflow: hidden; line-height: 1; }
  #reactbits-header .sm-panel-item {
    position: relative; display: inline-block; padding-right: 1.4em;
    color: #141416; font-size: clamp(32px, 8.4vw, 56px); font-weight: 600; line-height: 1;
    letter-spacing: -.01em; text-decoration: none;
    transition: color .25s ease, --sm-num-opacity .5s ease;
  }
  #reactbits-header .sm-panel-item:hover,
  #reactbits-header .sm-panel-item[aria-current="page"] { color: #584cd6; }
  #reactbits-header .sm-panel-itemLabel {
    display: inline-block; transform-origin: 50% 100%;
    transform: translate(0%, 140%) rotate(10deg);
    transition: transform .7s cubic-bezier(.16, 1, .3, 1);
    transition-delay: calc(.22s + var(--sm-i, 0) * .1s);
  }
  /* 2026-09-12 用户「01 02 03 04 05 06 的字取消」：序号本来是这里的 counter 伪元素，
     改成 content:none 直接不渲染（要恢复：把 content 换回 counter(smItem, decimal-leading-zero)）。 */
  #reactbits-header .sm-panel-item::after {
    counter-increment: smItem; content: none;
    position: absolute; top: .1em; right: 2.8em;
    font-size: 18px; font-weight: 400; color: #584cd6; letter-spacing: 0;
    opacity: var(--sm-num-opacity, 0);
    transition-delay: calc(.28s + var(--sm-i, 0) * .1s);
    pointer-events: none; -webkit-user-select: none; user-select: none;
  }

  /* —— 展开态 —— */
  #reactbits-header .staggered-menu-wrapper[data-open] .sm-prelayer { transform: translate(0, 0); }
  #reactbits-header .staggered-menu-wrapper[data-open] .staggered-menu-panel { transform: translateX(0); }
  #reactbits-header .staggered-menu-wrapper[data-open] .sm-panel-item { --sm-num-opacity: 1; }
  #reactbits-header .staggered-menu-wrapper[data-open] .sm-panel-itemLabel { transform: translate(0, 0) rotate(0deg); }
  #reactbits-header .staggered-menu-wrapper[data-open] .sm-toggle-textInner { transform: translateY(0); }
  #reactbits-header .staggered-menu-wrapper[data-open] .sm-icon-line { transform: translate(-50%, -50%) rotate(45deg); }
  #reactbits-header .staggered-menu-wrapper[data-open] .sm-icon-line-v { transform: translate(-50%, -50%) rotate(-45deg); }
  /* 白面板滑到了顶栏下面 → 顶栏让位（透明 + 字标反色 + Menu 转深色），与线上一致 */
  #reactbits-header .staggered-menu-wrapper[data-open] .staggered-menu-header { background: transparent; -webkit-backdrop-filter: none; backdrop-filter: none; border-bottom-color: transparent; }
  #reactbits-header .staggered-menu-wrapper[data-open] .sm-logo { filter: invert(1); }
  #reactbits-header .staggered-menu-wrapper[data-open] .sm-toggle { color: #141416; }

  html.sm-menu-locked, html.sm-menu-locked body { overflow: hidden; }
}

@media (max-width: 560px) {
  #reactbits-header .staggered-menu-panel,
  #reactbits-header .sm-prelayers { width: 100vw; }
}