/* ==========================================================================
   77-fox.com · 黑白版式（2026-10-04 起）
   纯黑白灰：浅色系统用白底黑字，深色系统用黑底白字，没有彩色、发光与粒子。标题与导航用系统无衬线；
   仅中日首页的章节大字使用书法字「FX Brush」（build/fonts.js 按用字子集化并内联 @font-face）。
   结构：tokens → 基础 → 页眉 → 按钮 → 字形与章节标 → 首页（首屏 / 演示 / 各章 / 收尾）→ 页脚
        → 内页组件 → 横排语言（html.k-hz）→ 动效状态 → 响应式 → 减少动效
   ========================================================================== */

:root {
  --bg: #FFFFFF;
  --bg2: #F4F4F3;
  --fg: #0A0A0A;
  --fg2: #595959;
  --fg3: #7D7D7D;
  --bg-rgb: 255 255 255;
  --fg-rgb: 10 10 10;
  --hair: rgb(var(--fg-rgb) / .22);
  --hair2: rgb(var(--fg-rgb) / .11);
  --shadow: 0 30px 70px -34px rgb(0 0 0 / .28);
  --head: 72px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans", "Yu Gothic UI", "Malgun Gothic", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", Consolas, monospace;
  --brush: "FX Brush", "STXingkai", "KaiTi", "STKaiti", serif;
  --gut: clamp(20px, 4.4vw, 88px);
  --wrap: 1240px;
  --ease: cubic-bezier(.2, .75, .2, 1);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0A0A0A;
    --bg2: #141414;
    --fg: #F5F5F4;
    --fg2: #A3A3A3;
    --fg3: #7A7A7A;
    --bg-rgb: 10 10 10;
    --fg-rgb: 245 245 244;
    --shadow: 0 30px 80px -34px rgb(0 0 0 / .85);
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { background: var(--bg); -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--head) + 12px); }
body {
  margin: 0; min-height: 100vh;
  background: var(--bg); color: var(--fg);
  font: 400 16px/1.85 var(--sans);
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
}
h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; }
img, svg { display: block; }
img { max-width: 100%; height: auto; }
a { color: inherit; }
button { font: inherit; }
::selection { background: var(--fg); color: var(--bg); }
:focus-visible { outline: 2px solid var(--fg); outline-offset: 3px; }

.k-sr, .sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.k-skip, .skip-link { position: fixed; inset-inline-start: 16px; top: -64px; z-index: 60; padding: 10px 16px; background: var(--fg); color: var(--bg); font-weight: 600; text-decoration: none; transition: top .2s; }
.k-skip:focus, .skip-link:focus { top: 12px; }
.k-defs { position: absolute; width: 0; height: 0; overflow: hidden; }
.k-nw { white-space: nowrap; }

main, .k-foot { position: relative; z-index: 2; }

/* ---------- 页眉 ---------- */
.k-head {
  position: fixed; inset: 0 0 auto; z-index: 30; height: var(--head);
  display: flex; align-items: center; gap: 26px; padding: 0 var(--gut);
  background: rgb(var(--bg-rgb) / .86); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  transition: background .5s, box-shadow .5s;
}
.k-head.is-scrolled, .k-page .k-head { box-shadow: 0 1px 0 var(--hair2); }
.k-brand { display: inline-flex; align-items: center; gap: 10px; color: var(--fg); text-decoration: none; flex: none; }
.k-brand img { border-radius: 7px; }
.k-brand-name { font: 700 19px/1 var(--sans); letter-spacing: -.01em; }
.k-nav { display: flex; align-items: center; gap: clamp(16px, 2vw, 30px); margin-inline-start: auto; font: 500 14px/1 var(--sans); letter-spacing: .06em; }
.k-nav > a, .k-drop > summary { color: var(--fg2); text-decoration: none; padding: 8px 0; transition: color .25s; white-space: nowrap; }
.k-nav > a:hover, .k-drop > summary:hover, .k-drop[open] > summary, .k-nav > a[aria-current] { color: var(--fg); }
.k-drop { position: relative; }
.k-drop > summary { list-style: none; cursor: pointer; display: inline-flex; align-items: center; gap: 8px; }
.k-drop > summary::-webkit-details-marker { display: none; }
.k-drop > summary::after { content: ""; width: 5px; height: 5px; border-right: 1px solid currentColor; border-bottom: 1px solid currentColor; transform: translateY(-2px) rotate(45deg); opacity: .7; }
.k-drop ul { position: absolute; top: calc(100% + 16px); inset-inline-start: -20px; min-width: 200px; margin: 0; padding: 10px 0; list-style: none; background: var(--bg); border: 1px solid var(--hair); box-shadow: var(--shadow); }
.k-drop li a { display: block; padding: 9px 20px; color: var(--fg2); text-decoration: none; letter-spacing: .06em; white-space: nowrap; }
.k-drop li a:hover, .k-drop li a[aria-current] { color: var(--fg); }
.k-lang ul { inset-inline-start: auto; inset-inline-end: -20px; min-width: 150px; }
.k-nav-web { border-inline-start: 1px solid var(--hair2); padding-inline-start: clamp(16px, 2vw, 30px) !important; }
.k-head-dl { min-height: 38px !important; padding: 0 16px !important; font-size: 14px !important; }
.k-menu-btn { display: none; }

/* ---------- 按钮（k-btn 与内页沿用的 btn 同一套） ---------- */
.k-btn, .btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 48px; padding: 0 24px; border: 1px solid transparent; border-radius: 2px;
  font: 600 15px/1 var(--sans); letter-spacing: .04em; text-decoration: none; white-space: nowrap; cursor: pointer;
  transition: background .3s, color .3s, border-color .3s, box-shadow .5s, transform .5s var(--ease);
}
.btn { min-height: 44px; padding: 0 20px; font-size: 14.5px; }
.btn svg { width: 17px; height: 17px; flex: none; }
.k-btn-solid, .btn-primary { background: var(--fg); color: var(--bg); }
.k-btn-solid:hover, .btn-primary:hover { background: rgb(var(--fg-rgb) / .82); }
.k-btn-line, .btn-ghost { background: transparent; color: var(--fg); border-color: rgb(var(--fg-rgb) / .35); }
.k-btn-line:hover, .btn-ghost:hover { border-color: var(--fg); background: rgb(var(--fg-rgb) / .06); }
.k-btn-text { padding: 0 2px; min-height: 48px; color: var(--fg2); background: linear-gradient(currentColor, currentColor) 0 calc(50% + 13px) / 100% 1px no-repeat; }
.k-btn-text:hover { color: var(--fg); }
.btn-lg { min-height: 56px; padding: 0 32px; font-size: 16px; }
.k-btn-big { min-height: 60px; padding: 0 36px; font-size: 17px; }
.k-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 22px; }

/* ---------- 字形：书法单字 / 功能图标 / 首屏字标 ---------- */
.k-glyph { position: relative; pointer-events: none; user-select: none; line-height: 1; --gs: min(76svh, 44vw); }
.k-glyph span {
  display: block; width: var(--gs); height: var(--gs);
  font: 400 var(--gs)/1 var(--brush); text-align: center;
  color: rgb(var(--fg-rgb) / .06);
  -webkit-text-stroke: 1px rgb(var(--fg-rgb) / .2);
}
.k-glyph span[data-icon] { -webkit-text-stroke: 0; }
.k-glyph span[data-icon] svg { width: 100%; height: 100%; fill: none; stroke: rgb(var(--fg-rgb) / .3); stroke-width: 1.2px; overflow: visible; }
.k-glyph span[data-icon] svg * { vector-effect: non-scaling-stroke; }

/* 竖排工具（中日） */
.k-v { writing-mode: vertical-rl; text-orientation: mixed; }
.k-v .k-l { display: block; }

/* 章节标：中日竖排「壹 / 提示词库」，其他语言横排小标 */
.k-tag {
  margin: 0; writing-mode: vertical-rl; display: flex; align-items: center; gap: 16px;
  font: 500 13px/1 var(--sans); letter-spacing: .3em; color: var(--fg2); white-space: nowrap;
}
.k-tag b { font: 700 24px/1 var(--sans); letter-spacing: 0; color: var(--fg); }
.k-tag::after { content: ""; inline-size: 64px; block-size: 1px; background: linear-gradient(to bottom, var(--fg), transparent); opacity: .5; }

/* ---------- 首屏 ---------- */
.k-hero {
  --gs: min(70svh, 44vw);
  position: relative; min-height: max(100svh, 700px);
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) var(--gs) minmax(0, .75fr);
  grid-template-rows: auto 1fr auto;
  column-gap: clamp(24px, 3vw, 64px);
  padding: calc(var(--head) + 40px) var(--gut) 52px;
  overflow-x: clip;
}
.k-glyph-hero { grid-column: 2; grid-row: 1 / -1; align-self: center; justify-self: center; --gs: inherit; }
.k-glyph-hero span { width: var(--gs); height: var(--gs); }
/* 首屏字标「77Fox」：无衬线粗体大字 */
.k-glyph-hero span.k-word {
  width: auto; height: auto; white-space: nowrap; direction: ltr;
  font: 800 calc(var(--gs) * .32)/1 var(--sans); letter-spacing: -.03em;
  color: var(--fg); -webkit-text-stroke: 0;
}
.k-eyebrow {
  grid-column: 1; grid-row: 1; align-self: start; margin: 0; max-width: 24em;
  font: 500 13px/1.8 var(--sans); letter-spacing: .08em; color: var(--fg2);
  display: flex; flex-wrap: wrap; gap: 0 .6em; padding-inline-start: 28px; position: relative;
}
.k-eyebrow::before { content: ""; position: absolute; inset-inline-start: 0; top: .9em; width: 16px; height: 1px; background: var(--fg); }
.k-eyebrow i { font-style: normal; color: var(--fg); }
.k-h1 {
  grid-column: 3; grid-row: 1 / 3; align-self: center; justify-self: start;
  margin: 0; font: 700 clamp(34px, min(4.6vw, 7.2svh), 86px)/1.32 var(--sans); letter-spacing: .08em; color: var(--fg);
}
.k-h1 .k-l { display: block; }
.k-h1.k-v .k-l + .k-l { margin-top: 1.6em; }
.k-hero-copy { grid-column: 1; grid-row: 2 / 4; align-self: end; max-width: 440px; }
.k-lead, .k-hero .hero-body { margin: 0 0 30px; font-size: clamp(15px, 1.08vw, 17px); line-height: 1.95; color: var(--fg2); }
.k-meta { margin: 26px 0 0; font: 400 12.5px/1.7 var(--sans); letter-spacing: .02em; color: var(--fg3); }
.k-meta span { white-space: nowrap; }
.k-phone {
  grid-column: 3; grid-row: 3; align-self: end; justify-self: end; margin: 0; max-width: 260px;
  font-size: 13px; line-height: 1.85; color: var(--fg2);
  padding-top: 16px; border-top: 1px solid var(--hair);
}
.k-cue { position: absolute; left: 50%; bottom: 18px; transform: translateX(-50%); display: flex; flex-direction: column; align-items: center; gap: 10px; font: 500 11px/1 var(--sans); letter-spacing: .5em; color: var(--fg3); writing-mode: vertical-rl; }
.k-cue i { position: relative; display: block; inline-size: 46px; block-size: 1px; background: var(--hair); overflow: hidden; }
.k-cue i::after { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 12px; background: linear-gradient(to bottom, transparent, var(--fg)); animation: k-drip 2.4s var(--ease) infinite; }
@keyframes k-drip { 0% { transform: translateY(-14px); } 70%, 100% { transform: translateY(48px); } }

/* ---------- 序 · 演示 ---------- */
.k-demo {
  --toc-col: 30px; --toc-h: 184px; --aside: calc(var(--toc-col) * 14 + 1px); --agap: clamp(40px, 5vw, 96px);
  position: relative; padding: clamp(110px, 15vh, 190px) var(--gut) clamp(150px, 20vh, 240px); overflow-x: clip;
}
.k-demo-head { display: flex; align-items: flex-start; gap: 28px; margin-bottom: clamp(44px, 7vh, 80px); }
.k-demo-note { margin: 0; font: 600 clamp(20px, 1.75vw, 30px)/1.6 var(--sans); color: var(--fg); letter-spacing: .05em; }
.k-demo-note span { display: block; }
.k-demo .showcase { position: relative; margin: 0; padding: 0; border: 0; background: none; box-shadow: none; animation: none; }
.k-demo .k-demo .scene-tabs {
  /* 物理定位：目录自身 direction: rtl（竖排自右向左），逻辑属性会按它自己的方向解析成左侧 */
  position: absolute; top: 0; right: 0; z-index: 3;
  display: grid; grid-auto-flow: column; grid-auto-columns: var(--toc-col);
  direction: rtl; gap: 0; margin: 0; padding: 0; overflow: visible;
  border-right: 1px solid var(--hair);
}
.k-demo .scene-tabs::before, .k-demo .scene-tabs::after { content: ""; position: absolute; left: 0; right: 0; height: 1px; background: var(--hair); pointer-events: none; }
.k-demo .scene-tabs::before { top: -5px; }
.k-demo .scene-tabs::after { bottom: -5px; }
.k-demo .scene-tabs button {
  writing-mode: vertical-rl; direction: ltr; text-orientation: mixed;
  display: flex; align-items: center; justify-content: flex-start; gap: 10px;
  width: var(--toc-col); height: var(--toc-h); margin: 0; padding: 16px 0;
  border: 0; border-left: 1px solid var(--hair2); border-radius: 0;
  background: transparent; color: var(--fg2);
  font: 500 15px/1 var(--sans); letter-spacing: .14em; white-space: nowrap; cursor: pointer;
  transition: color .3s, background .5s;
}
.k-demo .scene-tabs button svg { width: 13px; height: 13px; flex: none; opacity: .5; transition: opacity .3s; }
.k-demo .scene-tabs button:hover { color: var(--fg); }
.k-demo .scene-tabs button[aria-selected="true"] { color: var(--fg); background: linear-gradient(to top, rgb(var(--fg-rgb) / .09), rgb(var(--fg-rgb) / 0) 78%); }
.k-demo .scene-tabs button[aria-selected="true"] svg { opacity: 1; }
.k-demo .scene-tabs button:focus-visible { outline-offset: -3px; }
.k-toc-dot {
  position: absolute; left: 0; top: 0; width: 7px; height: 7px; margin: 16px 0 0 -3.5px; border-radius: 50%;
  background: var(--fg);
  pointer-events: none; transition: transform .7s var(--ease);
}
.k-demo .screenshot-stage { position: relative; border: 0; }
.k-demo .capture-layout { display: grid; grid-template-columns: minmax(0, 1fr) var(--aside); column-gap: var(--agap); align-items: start; max-width: none; margin: 0; }
.k-demo .fx-frame { grid-column: 1; grid-row: 1; }
.k-demo .capture-description { grid-column: 2; grid-row: 1; padding-top: calc(var(--toc-h) + clamp(56px, 8vh, 96px)); max-width: var(--aside); }
.capture-title { margin: 0 0 18px; font: 700 clamp(26px, 2.3vw, 38px)/1.2 var(--sans); letter-spacing: -.005em; color: var(--fg); }
.capture-title strong { font-weight: 700; }
.capture-description p:not(.capture-title) { margin: 0 0 24px; font-size: 15.5px; line-height: 1.95; color: var(--fg2); }
.text-link, .k-link {
  display: inline-flex; align-items: center; gap: 10px; color: var(--fg); text-decoration: none;
  font: 600 15px/1.4 var(--sans); letter-spacing: .06em; padding-bottom: 5px;
  background: linear-gradient(var(--fg), var(--fg)) 0 100% / 0% 1px no-repeat; transition: background-size .5s var(--ease);
}
.text-link svg { width: 14px; height: 14px; transition: transform .4s var(--ease); }
.text-link:hover, .k-link:hover { background-size: 100% 1px; }
.k-link i { font-style: normal; transition: transform .4s var(--ease); }
.k-link:hover i, .text-link:hover svg { transform: translateX(5px); }
[dir="rtl"] .k-link i, [dir="rtl"] .text-link svg { transform: scaleX(-1); }
[dir="rtl"] .k-link:hover i, [dir="rtl"] .text-link:hover svg { transform: scaleX(-1) translateX(5px); }
.k-demo .scene-caption { margin: clamp(64px, 9vh, 100px) 0 0; padding: 0; width: calc(100% - var(--aside) - var(--agap)); text-align: center; font: 500 12.5px/1.6 var(--sans); letter-spacing: .32em; color: var(--fg3); }

/* 演示窗口：细边 + 柔影 */
.k-demo .fx-frame, .k-window .fx-frame, .showcase .fx-frame {
  position: relative; border-radius: 10px;
  box-shadow: 0 0 0 1px var(--hair), var(--shadow);
}

/* ---------- 章节通用 ---------- */
.k-ch {
  --gs: min(76svh, 44vw);
  position: relative; display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); column-gap: clamp(14px, 1.8vw, 32px);
  padding: clamp(110px, 16vh, 210px) var(--gut); overflow-x: clip;
}
.k-ch .k-glyph { --gs: inherit; }
.k-h2 { margin: 0; font: 700 clamp(30px, 3.5vw, 64px)/1.3 var(--sans); letter-spacing: .02em; color: var(--fg); text-wrap: balance; }
.k-h2 .k-l { display: block; }
.k-h2.k-v { font-size: clamp(28px, 3.2vw, 56px); line-height: 1.55; letter-spacing: .09em; text-wrap: initial; }
.k-hg { margin: 0; min-width: 0; }
.k-sub { margin: 0; font: 500 clamp(16px, 1.2vw, 19px)/1.8 var(--sans); color: var(--fg2); letter-spacing: .06em; }
.k-text { min-width: 0; }
.k-p { margin: 0 0 30px; max-width: 34em; font-size: clamp(15px, 1.05vw, 17px); line-height: 1.95; color: var(--fg2); }
.k-pts { list-style: none; margin: 0 0 34px; padding: 0; max-width: 30em; }
.k-pts li { position: relative; padding: 13px 0; padding-inline-start: 26px; border-top: 1px solid var(--hair2); font-size: 15px; line-height: 1.6; color: var(--fg); }
.k-pts li:last-child { border-bottom: 1px solid var(--hair2); }
.k-pts li::before { content: ""; position: absolute; inset-inline-start: 3px; top: 50%; width: 5px; height: 5px; margin-top: -2.5px; border-radius: 50%; background: var(--fg); }
.k-window { position: relative; min-width: 0; z-index: 1; }

/* 壹 · 提示词库：左字、竖排标题，窗口压住字脚 */
.k-ch-prompts .k-glyph { grid-column: 1 / 7; grid-row: 1; justify-self: start; margin-inline-start: calc(var(--gs) * -0.04); }
.k-ch-prompts .k-h2 { grid-column: 8 / 11; grid-row: 1; justify-self: center; align-self: center; }
.k-ch-prompts .k-tag { grid-column: 12; grid-row: 1; justify-self: end; align-self: start; }
.k-ch-prompts .k-window { grid-column: 1 / 8; grid-row: 2; margin-top: calc(var(--gs) * -0.3); }
.k-ch-prompts .k-text { grid-column: 8 / 12; grid-row: 2; align-self: center; padding-top: 40px; }

/* 贰 · 仪表盘：字出血到右边，超大横排标题 */
.k-ch-dash .k-tag { grid-column: 1; grid-row: 1; align-self: start; }
.k-ch-dash .k-glyph { grid-column: 7 / 13; grid-row: 1; justify-self: end; margin-inline-end: calc(var(--gs) * -0.2 - var(--gut) * .5); }
.k-ch-dash .k-h2 { grid-column: 2 / 10; grid-row: 1; align-self: end; z-index: 1; font-size: clamp(32px, 4vw, 78px); margin-bottom: calc(var(--gs) * .06); }
.k-ch-dash .k-text { grid-column: 2 / 6; grid-row: 2; align-self: center; margin-top: 80px; }
.k-ch-dash .k-window { grid-column: 6 / 13; grid-row: 2; margin-top: 80px; }

/* 叁 · 浏览器扩展：窗口嵌在大字的框里 */
.k-ch-ext { --gs: min(104svh, 60vw); }
.k-ch-ext .k-tag { grid-column: 1; grid-row: 1; align-self: start; }
.k-ch-ext .k-glyph { grid-column: 2 / 12; grid-row: 1; justify-self: center; align-self: start; }
.k-ch-ext .k-window { grid-column: 2 / 12; grid-row: 1; justify-self: center; align-self: start; width: min(100%, 420px); margin-top: calc(var(--gs) * .2); }
.k-ch-ext .k-h2 { grid-column: 11 / 13; grid-row: 1; justify-self: end; align-self: start; margin-top: calc(var(--gs) * .12); font-size: clamp(26px, 2.9vw, 50px); }
.k-ch-ext .k-text { grid-column: 2 / 12; grid-row: 2; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); column-gap: clamp(32px, 5vw, 96px); margin-top: clamp(40px, 6vh, 80px); }
.k-ch-ext .k-text .k-p { grid-column: 1; grid-row: 1 / 3; }
.k-ch-ext .k-text .k-pts { grid-column: 2; }
.k-ch-ext .k-text .k-link { grid-column: 2; justify-self: start; }

/* 肆 · 服务器与硬件：标题在左，双碑并立 */
.k-ch-mon .k-tag { grid-column: 1; grid-row: 1; align-self: start; }
.k-ch-mon .k-h2 { grid-column: 2 / 9; grid-row: 1; align-self: center; z-index: 1; }
.k-ch-mon .k-glyph { grid-column: 8 / 13; grid-row: 1; justify-self: end; }
.k-twin { grid-column: 2 / 12; grid-row: 2; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin-top: clamp(48px, 8vh, 96px); border-top: 1px solid var(--hair); border-bottom: 1px solid var(--hair); }
.k-stele { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: clamp(24px, 3vw, 48px); padding: clamp(36px, 5vh, 56px) clamp(24px, 3vw, 48px); }
.k-stele + .k-stele { border-inline-start: 1px solid var(--hair); }
.k-stele h3 { margin: 0; font: 700 clamp(28px, 2.4vw, 40px)/1.2 var(--sans); letter-spacing: .22em; }
.k-stele h3 a { text-decoration: none; color: var(--fg); transition: color .3s; }
.k-stele h3 a:hover { color: var(--fg2); }
.k-stele-body { display: flex; flex-direction: column; align-items: flex-start; gap: 28px; }
.k-stele-body p { margin: 0; font-size: 15.5px; line-height: 1.95; color: var(--fg2); max-width: 26em; }

/* 伍 · MCP：字在左，标题在右，下方金线连印 */
.k-ch-mcp .k-glyph { grid-column: 1 / 7; grid-row: 1; justify-self: start; }
.k-ch-mcp .k-tag { grid-column: 12; grid-row: 1; justify-self: end; align-self: start; }
.k-ch-mcp .k-h2 { grid-column: 7 / 13; grid-row: 1; align-self: center; }
.k-ch-mcp .k-mcp-fig { grid-column: 1 / 7; grid-row: 2; margin: clamp(24px, 4vh, 56px) 0 0; }
.k-ch-mcp .k-text { grid-column: 7 / 12; grid-row: 2; align-self: center; margin-top: clamp(24px, 4vh, 56px); }
.k-mcp-fig svg { width: 100%; height: auto; overflow: visible; direction: ltr; }
.k-wire { fill: none; stroke: rgb(var(--fg-rgb) / .4); stroke-width: 1; }
.k-spark { fill: var(--fg); }
.k-node circle { fill: var(--fg); }
.k-node text { font: 600 21px var(--sans); fill: var(--fg); letter-spacing: .04em; }
.k-hub-label { font: 500 12px var(--sans); fill: var(--fg2); letter-spacing: .3em; }

/* 陆 · 全部功能：长卷 */
.k-ch-cat { --gs: min(58svh, 34vw); }
.k-ch-cat .k-glyph { grid-column: 1 / 5; grid-row: 1 / 3; justify-self: start; }
.k-ch-cat .k-tag { grid-column: 12; grid-row: 1; justify-self: end; align-self: start; }
.k-ch-cat .k-h2 { grid-column: 5 / 12; grid-row: 1; align-self: end; font-size: clamp(34px, 5vw, 96px); }
.k-ch-cat .k-sub { grid-column: 5 / 11; grid-row: 2; align-self: start; margin-top: 18px; }
.k-scroll-wrap { grid-column: 1 / -1; grid-row: 3; margin: clamp(56px, 9vh, 110px) calc(var(--gut) * -1) 0; min-width: 0; }
.k-scroll {
  writing-mode: vertical-rl; width: 100%; overflow-x: auto; overflow-y: hidden; scrollbar-width: none;
  padding: 0 var(--gut); cursor: grab; outline-offset: -3px;
  -webkit-mask-image: linear-gradient(to left, transparent, #000 var(--gut), #000 calc(100% - var(--gut)), transparent);
  mask-image: linear-gradient(to left, transparent, #000 var(--gut), #000 calc(100% - var(--gut)), transparent);
}
.k-scroll::-webkit-scrollbar { display: none; }
.k-scroll.is-drag { cursor: grabbing; user-select: none; }
.k-scroll-list { display: flex; flex-direction: column; margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--hair); border-bottom: 1px solid var(--hair); }
.k-scroll-list li { flex: none; border-left: 1px solid var(--hair2); }
.k-scroll-list li:first-child { border-right: 1px solid var(--hair2); }
.k-scroll-list a, .k-nolink {
  position: relative; display: block; block-size: 100%; inline-size: clamp(420px, 56svh, 520px);
  padding: 34px 16px 30px; color: inherit; text-decoration: none; outline-offset: -3px;
  transition: background .6s;
}
.k-scroll-list b { display: inline-block; margin-block-end: 14px; font: 700 13px/1 var(--sans); letter-spacing: .1em; color: var(--fg); opacity: .85; }
.k-scroll-list strong { font: 700 21px/1.5 var(--sans); letter-spacing: .08em; color: var(--fg); transition: color .3s; }
.k-scroll-list span { display: block; margin-block-start: 12px; font-size: 14px; line-height: 1.9; letter-spacing: .06em; color: var(--fg2); transition: color .3s; }
.k-scroll-list a::before, .k-nolink::before { content: ""; position: absolute; left: 50%; top: 12px; width: 6px; height: 6px; margin-left: -3px; border-radius: 50%; background: var(--fg); opacity: 0; transform: scale(.4); transition: opacity .4s, transform .5s var(--ease); }
.k-scroll-list a:hover, .k-scroll-list a:focus-visible, .k-nolink:hover, .k-nolink:focus-visible { background: linear-gradient(to top, rgb(var(--fg-rgb) / .07), rgb(var(--fg-rgb) / 0) 72%); }
.k-scroll-list a:hover strong, .k-scroll-list a:focus-visible strong, .k-nolink:hover strong, .k-nolink:focus-visible strong { color: var(--fg2); }
.k-scroll-list a:hover span, .k-scroll-list a:focus-visible span, .k-nolink:hover span, .k-nolink:focus-visible span { color: var(--fg); }
.k-scroll-list a:hover::before, .k-scroll-list a:focus-visible::before, .k-nolink:hover::before, .k-nolink:focus-visible::before { opacity: 1; transform: scale(1); }
.k-scroll-ctrl { display: flex; align-items: center; justify-content: flex-end; gap: 18px; margin: 22px var(--gut) 0; }
.k-scroll-ctrl[hidden] { display: none; }
.k-scroll-ctrl button { width: 42px; height: 42px; border: 1px solid var(--hair); border-radius: 50%; background: transparent; color: var(--fg2); font: 400 16px/1 var(--sans); cursor: pointer; transition: color .3s, border-color .3s; }
.k-scroll-ctrl button:hover { color: var(--fg); border-color: var(--fg); }
.k-sc-bar { position: relative; width: 160px; height: 1px; background: var(--hair2); }
.k-sc-bar i { position: absolute; right: 0; top: -1px; height: 3px; width: 20%; background: var(--fg); }

/* 柒 · 在哪儿用：竖排三列标题 + 细金线表 */
.k-ch-plat .k-tag { grid-column: 12; grid-row: 1; justify-self: end; align-self: start; }
.k-ch-plat .k-h2 { grid-column: 9 / 12; grid-row: 1 / 3; justify-self: center; align-self: start; }
.k-ch-plat .k-sub { grid-column: 2 / 8; grid-row: 1; align-self: end; max-width: 30em; }
.k-table-wrap { grid-column: 2 / 8; grid-row: 2; margin-top: 44px; min-width: 0; }
.k-table { width: 100%; border-collapse: collapse; font-size: 15px; }
.k-table th, .k-table td { padding: 15px 10px; border-bottom: 1px solid rgb(var(--fg-rgb) / .12); text-align: center; }
.k-table thead th { padding-bottom: 18px; font: 600 13px/1.4 var(--sans); letter-spacing: .26em; color: var(--fg2); border-bottom: 1px solid var(--hair); }
.k-table thead th:first-child, .k-table tbody th { text-align: start; padding-inline-start: 0; }
.k-table tbody th { font: 500 16px/1.4 var(--sans); letter-spacing: .06em; color: var(--fg); }
.k-table tbody tr { transition: background .4s; }
.k-table tbody tr:hover { background: linear-gradient(90deg, rgb(var(--fg-rgb) / .05), rgb(var(--fg-rgb) / 0) 80%); }
.k-yes { display: inline-block; width: 7px; height: 7px; border-radius: 50%; vertical-align: middle; background: var(--fg); }
.k-no { display: inline-block; width: 14px; height: 1px; vertical-align: middle; background: var(--fg3); opacity: .55; }
.k-bridge { font: 500 13px/1.3 var(--sans); letter-spacing: .06em; color: var(--fg); }

/* 捌 · 数据与同步：大横排 + 简牍三条 */
.k-ch-sync .k-tag { grid-column: 1; grid-row: 1; align-self: start; }
.k-ch-sync .k-glyph { grid-column: 7 / 13; grid-row: 1 / 3; justify-self: end; align-self: start; margin-inline-end: calc(var(--gs) * -0.12); }
.k-ch-sync .k-h2 { grid-column: 2 / 10; grid-row: 1; align-self: end; z-index: 1; font-size: clamp(32px, 4.5vw, 88px); }
.k-ch-sync .k-text { grid-column: 2 / 7; grid-row: 2; margin-top: 48px; }
.k-slips { grid-column: 2 / 7; grid-row: 3; position: relative; list-style: none; display: flex; gap: 16px; margin: 64px 0 0; padding: 0; }
.k-slips::before, .k-slips::after { content: ""; position: absolute; left: -14px; right: -14px; height: 1px; background: linear-gradient(90deg, transparent, rgb(var(--fg-rgb) / .45), transparent); pointer-events: none; }
.k-slips::before { top: 18%; }
.k-slips::after { bottom: 18%; }
.k-slips li {
  writing-mode: vertical-rl; display: flex; align-items: center; gap: 16px;
  min-height: 330px; width: 66px; padding: 24px 0;
  border: 1px solid var(--hair); border-radius: 3px;
  background: linear-gradient(to right, rgb(var(--fg-rgb) / .07), rgb(var(--fg-rgb) / .015));
  font: 500 16px/1 var(--sans); letter-spacing: .14em; color: var(--fg);
}
.k-slips b { font-weight: 700; color: var(--fg); }

/* 玖 · 价格：四支签 */
.k-ch-price { --gs: min(66svh, 37vw); }
.k-ch-price .k-glyph { grid-column: 1 / 6; grid-row: 1 / 3; justify-self: start; }
.k-ch-price .k-tag { grid-column: 12; grid-row: 1; justify-self: end; align-self: start; }
.k-ch-price .k-h2 { grid-column: 6 / 12; grid-row: 1; align-self: end; }
.k-ch-price .k-text { grid-column: 6 / 11; grid-row: 2; margin-top: 36px; }
.k-sticks { grid-column: 2 / 12; grid-row: 3; position: relative; list-style: none; margin: clamp(72px, 12vh, 140px) 0 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: clamp(16px, 2.4vw, 44px); justify-items: center; align-items: end; }
.k-sticks::after { content: ""; position: absolute; left: 4%; right: 4%; bottom: -1px; height: 1px; background: var(--hair); }
.k-stick {
  color: inherit; text-decoration: none;
  position: relative; width: min(100%, 196px); min-height: clamp(400px, 54svh, 520px);
  display: flex; flex-direction: column; align-items: center; padding: 40px 14px 28px;
  border: 1px solid var(--hair); border-bottom-color: transparent; border-radius: 50% 50% 0 0 / 9% 9% 0 0;
  background: linear-gradient(to bottom, #18150f, #0d0b09 74%);
  transition: transform .8s var(--ease), border-color .5s, box-shadow .8s, background .8s;
}
.k-stick::before { content: ""; position: absolute; top: 18px; left: 50%; width: 7px; height: 7px; margin-left: -3.5px; border-radius: 50%; border: 1px solid var(--hair); transition: background .5s, box-shadow .5s; }
.k-stick-name { writing-mode: vertical-rl; margin: 14px 0 auto; font: 700 clamp(30px, 2.6vw, 44px)/1 var(--sans); letter-spacing: .06em; color: var(--fg); white-space: nowrap; transition: color .5s; }
.k-stick-cr { display: flex; flex-direction: column; align-items: center; gap: 8px; margin-top: 30px; }
.k-stick-cr b { font: 700 clamp(34px, 3vw, 54px)/1 var(--sans); letter-spacing: -.02em; color: var(--fg); direction: ltr; }
.k-stick-cr small { font: 500 12px/1.4 var(--sans); letter-spacing: .2em; color: var(--fg2); text-align: center; }
.k-stick-price { width: 100%; margin-top: 24px; padding-top: 18px; border-top: 1px solid var(--hair2); text-align: center; font: 600 17px/1 var(--sans); color: var(--fg); }
.k-stick-price small { font-size: 12px; color: var(--fg2); }
.k-stick:hover {
  transform: translateY(-24px); border-color: var(--fg); border-bottom-color: transparent;
  background: linear-gradient(to top, rgb(var(--fg-rgb) / .1), rgb(var(--fg-rgb) / .02) 60%, var(--bg) 90%);
}
.k-stick:hover::before { background: var(--fg); }
.k-stick:hover .k-stick-name { color: var(--fg); }
.k-incl { grid-column: 2 / 12; grid-row: 4; display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 18px 40px; align-items: baseline; margin-top: clamp(56px, 8vh, 88px); }
.k-incl-h { margin: 0; font: 700 14px/1.6 var(--sans); letter-spacing: .26em; color: var(--fg); }
.k-incl ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; row-gap: 10px; }
.k-incl li { padding: 0 18px; border-inline-start: 1px solid var(--hair2); font-size: 15px; line-height: 1.6; color: var(--fg); }
.k-incl li:first-child { padding-inline-start: 0; border-inline-start: 0; }
.k-fine { grid-column: 2; margin: 0; font-size: 13px; color: var(--fg2); }
.k-incl .k-link { grid-column: 2; justify-self: start; margin-top: 8px; }

/* 拾 · 常见问题：字吸顶，问答在右 */
.k-ch-faq { --gs: min(52svh, 30vw); align-items: start; }
.k-faq-side { grid-column: 1 / 6; grid-row: 1; position: sticky; top: calc(var(--head) + 48px); display: grid; grid-template-columns: auto auto; grid-template-rows: auto 1fr; column-gap: clamp(20px, 2.4vw, 40px); justify-content: start; }
.k-faq-side .k-glyph { grid-column: 1; grid-row: 1 / 3; }
.k-faq-side .k-tag { grid-column: 2; grid-row: 1; }
.k-faq-side .k-h2 { grid-column: 2; grid-row: 2; margin-top: 28px; font-size: clamp(30px, 3.2vw, 54px); letter-spacing: .32em; }
.k-qa-list { grid-column: 6 / 13; grid-row: 1; padding-top: 8px; }
.k-qa { border-top: 1px solid var(--hair2); }
.k-qa:last-child { border-bottom: 1px solid var(--hair2); }
.k-qa summary { list-style: none; display: grid; grid-template-columns: 46px minmax(0, 1fr) 22px; align-items: baseline; gap: 12px; padding: 26px 0; cursor: pointer; font: 600 clamp(18px, 1.45vw, 23px)/1.5 var(--sans); letter-spacing: .03em; color: var(--fg); transition: color .3s; }
.k-qa summary::-webkit-details-marker { display: none; }
.k-qa summary b { font: 700 15px/1 var(--sans); color: var(--fg); }
.k-qa summary i { position: relative; width: 14px; height: 14px; align-self: center; }
.k-qa summary i::before, .k-qa summary i::after { content: ""; position: absolute; left: 0; right: 0; top: 50%; height: 1px; background: currentColor; transition: transform .5s var(--ease), opacity .4s; }
.k-qa summary i::after { transform: rotate(90deg); }
.k-qa[open] summary i::after { transform: rotate(0); opacity: 0; }
.k-qa summary:hover, .k-qa[open] summary { color: var(--fg); }
.k-qa[open] { background: linear-gradient(to right, rgb(var(--fg-rgb) / .04), transparent 70%); }
.k-a p { margin: 0; padding: 0 40px 32px; padding-inline-start: 58px; max-width: 42em; font-size: 16px; line-height: 1.95; color: var(--fg2); }

/* 附 · 文章 */
.k-ch-blog .k-tag { grid-column: 1; grid-row: 1 / 3; align-self: start; }
.k-ch-blog .k-h2 { grid-column: 2 / 10; grid-row: 1; }
.k-posts { grid-column: 2 / 13; grid-row: 2; list-style: none; margin: clamp(48px, 7vh, 80px) 0 40px; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.k-posts li { border-inline-start: 1px solid var(--hair2); }
.k-posts li:first-child { border-inline-start-color: var(--hair); }
.k-posts a { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 14px 18px; height: 100%; padding: 10px clamp(18px, 2.4vw, 40px) 18px clamp(16px, 2vw, 28px); color: inherit; text-decoration: none; transition: background .5s; }
.k-posts b { grid-row: 1 / 3; font: 700 15px/1 var(--sans); color: var(--fg); }
.k-posts strong { font: 700 clamp(18px, 1.45vw, 23px)/1.55 var(--sans); color: var(--fg); transition: color .3s; }
.k-posts span { font-size: 14.5px; line-height: 1.9; color: var(--fg2); }
.k-posts a:hover { background: linear-gradient(to top, rgb(var(--fg-rgb) / .06), transparent 70%); }
.k-posts a:hover strong { color: var(--fg); }
.k-ch-blog > .k-link { grid-column: 2 / 8; grid-row: 3; justify-self: start; }

/* 终 · 收尾 */
.k-cta { --gs: min(64svh, 46vw); justify-items: center; text-align: center; padding-bottom: clamp(150px, 22vh, 260px); }
.k-cta > * { grid-column: 1 / -1; }
.k-cta .k-glyph { grid-row: 1; }
.k-cta .k-h2 { grid-row: 2; margin-top: calc(var(--gs) * -0.1); font-size: clamp(32px, 4.4vw, 84px); }
.k-cta .k-sub { grid-row: 3; margin-top: 18px; }
.k-cta-act { grid-row: 4; justify-content: center; margin-top: 64px; column-gap: 56px; }

/* ---------- 页脚 ---------- */
.k-foot {
  display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 2fr); gap: 56px 64px;
  padding: clamp(72px, 10vh, 110px) var(--gut) 44px;
  border-top: 1px solid var(--hair);
  background: linear-gradient(to bottom, rgb(var(--bg-rgb) / .55), var(--bg) 45%);
}
.k-foot-brand p { margin: 20px 0 0; font: 600 18px/1.6 var(--sans); letter-spacing: .04em; color: var(--fg2); }
.k-foot-cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 32px; }
.k-foot-h { margin: 0 0 18px; font: 700 13px/1 var(--sans); letter-spacing: .32em; color: var(--fg); }
.k-foot ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 11px; }
.k-foot a { color: var(--fg2); text-decoration: none; font-size: 14px; transition: color .25s; }
.k-foot a:hover, .k-foot a[aria-current] { color: var(--fg); }
.k-foot .k-brand-name { font-size: 22px; color: var(--fg); }
.k-foot-langs { grid-column: 1 / -1; display: flex !important; flex-wrap: wrap; gap: 8px 24px; padding-top: 28px !important; border-top: 1px solid var(--hair2); }
.k-foot-langs a { font-family: var(--sans); letter-spacing: .06em; }
.k-copy { grid-column: 1 / -1; margin: 0; font-size: 13px; color: var(--fg3); letter-spacing: .1em; }

/* ==========================================================================
   内页组件（功能、定价、下载、更新日志、文章、法务）
   ========================================================================== */
.k-page main { padding-top: var(--head); }
.wrap { width: min(var(--wrap), 100% - 2 * clamp(20px, 4vw, 48px)); margin-inline: auto; }
.page-head { padding: clamp(56px, 9vh, 96px) 0 18px; }
.breadcrumb { display: flex; flex-wrap: wrap; align-items: center; gap: 0 10px; margin-bottom: 26px; font: 500 13px/1.6 var(--sans); letter-spacing: .08em; color: var(--fg3); }
.breadcrumb a { color: var(--fg2); text-decoration: none; }
.breadcrumb a:hover { color: var(--fg); }
.breadcrumb [aria-current] { color: var(--fg2); }
.page-head h1, .legal h1, .notfound h1 { font: 700 clamp(36px, 4.6vw, 70px)/1.14 var(--sans); letter-spacing: .01em; color: var(--fg); max-width: 22ch; text-wrap: balance; }
:lang(zh) .page-head h1, :lang(ja) .page-head h1 { letter-spacing: .04em; }
.lead { margin: 26px 0 18px; max-width: 64ch; font-size: clamp(16.5px, 1.25vw, 19px); line-height: 1.9; color: var(--fg2); }
.feature-definition { margin: 8px 0 26px; max-width: 70ch; padding-inline-start: 18px; border-inline-start: 2px solid var(--fg); font: 500 16px/1.9 var(--sans); color: var(--fg); }
.feature-hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 24px; margin: 6px 0 clamp(48px, 7vh, 80px); }
.dl-meta-line { font: 400 12.5px/1.6 var(--sans); color: var(--fg3); }
.eyebrow { display: inline-block; margin-bottom: 14px; font: 700 12px/1 var(--sans); letter-spacing: .3em; color: var(--fg); }

/* 内页演示外壳（功能页、下载页）：横排页签 + 暗面板 */
.showcase { position: relative; margin: 0 0 clamp(56px, 8vh, 96px); padding: clamp(18px, 2.4vw, 32px); border: 1px solid var(--hair2); border-radius: 4px; background: rgb(var(--fg-rgb) / .02); }
.scene-tabs { display: flex; flex-wrap: wrap; justify-content: center; gap: 4px 18px; margin: 0 0 clamp(24px, 4vh, 40px); padding: 0; }
.scene-tabs[data-count="1"], [data-demo]:not([data-enhanced]) .scene-tabs { display: none; }
.scene-tabs button { display: inline-flex; align-items: center; gap: 8px; padding: 10px 2px; border: 0; border-bottom: 1px solid transparent; background: none; color: var(--fg2); font: 500 14.5px/1.3 var(--sans); letter-spacing: .06em; cursor: pointer; transition: color .3s, border-color .3s; }
.scene-tabs button svg { width: 15px; height: 15px; opacity: .6; }
.scene-tabs button:hover { color: var(--fg); }
.scene-tabs button[aria-selected="true"] { color: var(--fg); border-bottom-color: var(--fg); }
.scene-tabs button[aria-selected="true"] svg { opacity: 1; }
.capture-layout { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: center; gap: clamp(28px, 4vw, 64px); max-width: 1040px; margin: 0 auto; }
.capture-layout-solo { grid-template-columns: minmax(0, 1fr); justify-items: center; }
.capture-description { max-width: 40ch; }
.scene-caption { margin: clamp(28px, 4vh, 44px) 0 0; text-align: center; font: 500 12.5px/1.6 var(--sans); letter-spacing: .2em; color: var(--fg3); }
.showcase .fx-frame { margin-inline: auto; }

/* 卡片 */
.card-grid { display: grid; gap: 1px; margin-top: 28px; background: var(--hair2); border: 1px solid var(--hair2); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card { position: relative; display: block; min-width: 0; padding: clamp(22px, 2.4vw, 32px); background: var(--bg); color: inherit; text-decoration: none; transition: background .5s; }
a.card:hover { background: linear-gradient(to top, rgb(var(--fg-rgb) / .06), var(--bg) 75%); }
a.card:hover h3 { color: var(--fg); }
.card-icon { display: inline-grid; place-items: center; width: 40px; height: 40px; margin-bottom: 18px; border: 1px solid var(--hair); border-radius: 50%; color: var(--fg); }
.card-icon svg { width: 19px; height: 19px; }
.card h3 { margin: 0 0 10px; font: 700 clamp(18px, 1.4vw, 21px)/1.45 var(--sans); letter-spacing: .02em; color: var(--fg); transition: color .3s; }
.card p { margin: 0; font-size: 15px; line-height: 1.85; color: var(--fg2); }
.module-chips, .chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.module-chips span, .chip { display: inline-flex; align-items: center; gap: 7px; padding: 3px 10px; border: 1px solid var(--hair2); border-radius: 999px; font-size: 12px; line-height: 1.6; color: var(--fg2); text-decoration: none; }
.chip span { color: var(--fg3); }
a.chip:hover { border-color: var(--fg); color: var(--fg); }
.chips-lead { margin-top: 26px; }
.module-more { margin-top: 14px; font-size: 14px; }
.module-more > summary { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; color: var(--fg); list-style: none; }
.module-more > summary::-webkit-details-marker { display: none; }
.module-detail { padding-top: 14px; color: var(--fg2); }
.feature-jump { margin: 0 0 clamp(56px, 8vh, 96px); }
.feature-jump-title { margin: 0; font: 600 13px/1.4 var(--sans); letter-spacing: .3em; color: var(--fg2); }

/* 长文 */
.prose { max-width: 74ch; padding: clamp(32px, 5vh, 56px) 0 16px; font-size: 17px; line-height: 1.95; }
.prose > * + * { margin-top: 18px; }
.prose h2 { margin: 56px 0 18px; font: 700 clamp(24px, 2.3vw, 34px)/1.35 var(--sans); letter-spacing: .02em; color: var(--fg); }
.prose h2:first-child { margin-top: 0; }
.prose h3 { margin: 36px 0 12px; font: 700 20px/1.5 var(--sans); color: var(--fg); }
.prose h4 { margin: 28px 0 10px; font: 600 17px/1.5 var(--sans); color: var(--fg); }
.prose p, .prose li { color: var(--fg2); }
.prose strong { color: var(--fg); font-weight: 650; }
.prose ul, .prose ol { padding-inline-start: 24px; }
.prose li + li { margin-top: 10px; }
.prose li::marker { color: var(--fg); }
.prose a:not(.btn):not(.text-link) { color: var(--fg); text-decoration: underline; text-decoration-color: rgb(var(--fg-rgb) / .4); text-underline-offset: 4px; }
.prose a:not(.btn):not(.text-link):hover { text-decoration-color: var(--fg); }
.prose code { font: .87em var(--mono); padding: 2px 6px; background: rgb(var(--fg-rgb) / .07); border-radius: 3px; overflow-wrap: anywhere; color: var(--fg); }
.prose pre, .download-checksum pre { overflow-x: auto; padding: 16px 18px; background: rgb(var(--fg-rgb) / .05); border: 1px solid var(--hair2); border-radius: 3px; font: 13px/1.7 var(--mono); }
.prose pre code, .download-checksum pre code { padding: 0; background: none; }
.prose blockquote { padding: 4px 0; padding-inline-start: 20px; border-inline-start: 1px solid var(--fg); color: var(--fg); }
.prose table { width: 100%; border-collapse: collapse; font-size: 15px; }
.prose th, .prose td { padding: 12px 10px; border-bottom: 1px solid var(--hair2); text-align: start; vertical-align: top; }
.prose th { font: 600 14px/1.5 var(--sans); color: var(--fg); border-bottom-color: var(--hair); }
/* 文章正文与更新日志条目用无衬线（不进衬线子集，见 build/fonts.js） */
.post-body h2, .post-body h3, .post-body h4, .release h2 { font-family: var(--sans); font-weight: 700; letter-spacing: 0; }
.prose td { color: var(--fg2); }
.prose img { border: 1px solid var(--hair2); }
.prose hr { border: 0; height: 1px; background: var(--hair2); margin: 40px 0; }
.feature-sections .feature-section { scroll-margin-top: calc(var(--head) + 24px); }
.feature-sections .feature-section + .feature-section { margin-top: 64px; padding-top: 56px; border-top: 1px solid var(--hair2); }
.feature-guides { max-width: 74ch; padding-top: 48px; }
.feature-guides h2 { font: 700 24px/1.4 var(--sans); }
.guide-list { list-style: none; margin: 18px 0 0; padding: 0; }
.guide-list li { padding: 16px 0; border-top: 1px solid var(--hair2); }
.guide-list a { display: block; font: 600 17px/1.5 var(--sans); color: var(--fg); text-decoration: none; }
.guide-list a:hover { color: var(--fg); }
.guide-list span { display: block; margin-top: 4px; font-size: 14.5px; color: var(--fg2); }

/* 问答（内页） */
.faq { margin-top: 18px; }
.faq details { border-top: 1px solid var(--hair2); }
.faq details:last-child { border-bottom: 1px solid var(--hair2); }
.faq summary { position: relative; list-style: none; padding: 22px 0; padding-inline-end: 40px; cursor: pointer; font: 600 17px/1.55 var(--sans); color: var(--fg); transition: color .3s; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before, .faq summary::after { content: ""; position: absolute; inset-inline-end: 6px; top: 50%; width: 14px; height: 1px; background: currentColor; transition: transform .5s var(--ease), opacity .4s; }
.faq summary::after { transform: rotate(90deg); }
.faq details[open] summary::after { transform: rotate(0); opacity: 0; }
.faq summary:hover, .faq details[open] summary { color: var(--fg); }
.faq details p { margin: 0; padding: 0 0 26px; max-width: 68ch; color: var(--fg2); }

/* 区块 */
.section { padding: clamp(64px, 10vh, 110px) 0; }
.section-alt { border-top: 1px solid var(--hair2); border-bottom: 1px solid var(--hair2); background: rgb(var(--fg-rgb) / .02); }
.section-alt h2 { font: 700 clamp(22px, 2vw, 28px)/1.4 var(--sans) !important; }
.section-tight { padding: 24px 0; }

/* 内页收尾 */
.k-band { position: relative; padding: clamp(96px, 14vh, 160px) 0; text-align: center; border-top: 1px solid var(--hair2); overflow: hidden; }
.k-band h2 { margin: 0 auto; max-width: 24ch; font: 700 clamp(30px, 3.6vw, 60px)/1.25 var(--sans); color: var(--fg); text-wrap: balance; }
.k-band p { margin: 22px auto 0; max-width: 46ch; font: 500 clamp(16px, 1.2vw, 18px)/1.8 var(--sans); color: var(--fg2); }
.k-band .k-actions { justify-content: center; margin-top: 44px; }

/* 定价 */
.free-panel { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 24px 40px; margin: clamp(36px, 5vh, 56px) 0; padding: clamp(26px, 3vw, 40px); border: 1px solid var(--hair); background: linear-gradient(110deg, rgb(var(--fg-rgb) / .1), rgb(var(--fg-rgb) / .02) 60%); }
.free-panel h2 { font: 700 clamp(22px, 2vw, 30px)/1.4 var(--sans); color: var(--fg); }
.free-panel p { margin-top: 10px; max-width: 64ch; color: var(--fg2); }
.plan-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 1px; margin: 32px 0 22px; background: var(--hair2); border: 1px solid var(--hair2); }
.plan-card { position: relative; display: flex; flex-direction: column; gap: 14px; min-width: 0; padding: clamp(24px, 2.4vw, 32px); background: var(--bg); scroll-margin-top: calc(var(--head) + 24px); transition: background .5s; }
.plan-card:hover { background: linear-gradient(to top, rgb(var(--fg-rgb) / .06), var(--bg) 70%); }
.plan-card.featured { box-shadow: inset 0 0 0 1px var(--hair); }
.plan-card h2 { font: 700 26px/1.2 var(--sans); color: var(--fg); }
.plan-price { display: flex; align-items: baseline; flex-wrap: wrap; gap: 6px; }
.plan-price b { font: 700 clamp(34px, 3vw, 44px)/1.15 var(--sans); color: var(--fg); letter-spacing: -.01em; }
.plan-price span { font-size: 13px; color: var(--fg2); }
.plan-credits { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--fg); }
.plan-credits svg { width: 15px; height: 15px; color: var(--fg); flex: none; }
.plan-note { flex: 1; font-size: 13px; color: var(--fg2); }
.plan-card .btn { width: 100%; }
.plan-same-note { max-width: 85ch; margin-bottom: 36px; font-size: 13.5px; color: var(--fg2); }
.pricing-guide { padding: 24px 0 0; }
.dl-tag { display: inline-block; align-self: flex-start; padding: 4px 10px; border: 1px solid var(--hair); font: 600 11.5px/1.4 var(--sans); letter-spacing: .12em; color: var(--fg); }

/* 下载 */
.dl-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); gap: 1px; margin: 34px 0 clamp(56px, 8vh, 96px); background: var(--hair2); border: 1px solid var(--hair2); }
.dl-card { display: flex; flex-direction: column; gap: 12px; padding: clamp(26px, 3vw, 40px); background: var(--bg); }
.dl-card.featured { background: rgb(var(--fg-rgb) / .03); box-shadow: inset 0 0 0 1px var(--fg); }
.dl-card .dl-tag[style] { color: var(--fg2) !important; border-color: var(--hair2); }
.dl-card h2 { font: 700 clamp(22px, 2vw, 28px)/1.3 var(--sans); color: var(--fg); }
.dl-card > p { font-size: 15px; color: var(--fg2); min-height: 54px; }
.dl-meta { list-style: none; margin: 8px 0 12px; padding: 0; font-size: 13.5px; color: var(--fg2); }
.dl-meta li { display: flex; justify-content: space-between; gap: 18px; padding: 10px 0; border-bottom: 1px solid var(--hair2); }
.dl-meta b { font-weight: 500; color: var(--fg3); }
.dl-changelog { margin-top: 6px; font-size: 13.5px; color: var(--fg2); }
.dl-preview .showcase { margin-bottom: 0; }
.download-checksum { margin-top: 26px; }
.download-checksum h3 { font: 700 17px/1.5 var(--sans); color: var(--fg); }
.download-checksum p { margin-top: 10px; }
.hash { font: 12.5px/1.8 var(--mono); word-break: break-all; }
.hash code { padding: 10px 12px; display: block; background: rgb(var(--fg-rgb) / .05); border: 1px solid var(--hair2); }
.download-checksum-legacy { margin-top: 26px; }
.download-checksum-legacy > summary { cursor: pointer; color: var(--fg); font: 600 15px/1.5 var(--sans); }
[dir="rtl"] .hash, [dir="rtl"] code, [dir="rtl"] pre { direction: ltr; unicode-bidi: embed; text-align: left; }

/* 更新日志 */
.release-list { display: grid; }
.release { display: grid; grid-template-columns: 160px minmax(0, 1fr); gap: 32px; padding: 36px 0; border-bottom: 1px solid var(--hair2); scroll-margin-top: calc(var(--head) + 24px); }
.release-current { border-top: 1px solid var(--hair); background: linear-gradient(to right, rgb(var(--fg-rgb) / .04), transparent 60%); }
.release-meta { font-size: 13px; line-height: 1.8; color: var(--fg3); }
.release-ver { font: 600 15px/1.4 var(--mono); color: var(--fg); }
.release h2 { margin-bottom: 12px; font: 700 clamp(20px, 1.8vw, 26px)/1.4 var(--sans); color: var(--fg); }
.release p, .release li { font-size: 15.5px; color: var(--fg2); }
.release ul { margin-top: 12px; padding-inline-start: 20px; }
.release li + li { margin-top: 6px; }
.release .btn + .btn { margin-inline-start: 10px; }

/* 法务、关于 */
.legal { max-width: 76ch; padding: clamp(56px, 9vh, 96px) 0 clamp(64px, 10vh, 110px); }
.legal .lead { margin-bottom: 40px; }
.legal section { margin-top: 40px; }
.legal h2 { margin-bottom: 12px; font: 700 clamp(20px, 1.8vw, 24px)/1.45 var(--sans); color: var(--fg); }
.legal p { color: var(--fg2); }
.legal a:not(.btn) { color: var(--fg); }
.updated { margin-top: 16px; font-size: 13.5px; color: var(--fg3); }

/* 文章 */
.post-list { display: grid; gap: 1px; margin: 34px 0; background: var(--hair2); border: 1px solid var(--hair2); }
.post-card { padding: clamp(24px, 2.6vw, 34px); background: var(--bg); transition: background .5s; }
.post-card:hover { background: linear-gradient(to right, rgb(var(--fg-rgb) / .05), var(--bg) 70%); }
.post-card-main { color: inherit; text-decoration: none; }
.post-card h2 { font: 700 clamp(20px, 1.8vw, 26px)/1.45 var(--sans); color: var(--fg); transition: color .3s; }
.post-card-main:hover h2 { color: var(--fg); }
.post-card p { margin-top: 10px; font-size: 15px; color: var(--fg2); }
.post-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 9px; margin-top: 16px; font-size: 12.5px; color: var(--fg3); }
.post-meta-lg { font-size: 14px; }
.post-layout { display: grid; grid-template-columns: minmax(0, 1fr) 240px; gap: 72px; align-items: start; }
.post-layout .toc { order: 2; }
.post-layout .post-body { order: 1; }
.toc { position: sticky; top: calc(var(--head) + 28px); max-height: calc(100dvh - var(--head) - 56px); overflow: auto; margin-top: 48px; padding-inline-start: 20px; border-inline-start: 1px solid var(--hair); }
.toc-title { margin-bottom: 14px; font: 700 12px/1.4 var(--sans); letter-spacing: .3em; color: var(--fg); }
.toc ul { list-style: none; margin: 0; padding: 0; }
.toc a { display: block; padding: 6px 0; font-size: 13px; line-height: 1.6; color: var(--fg2); text-decoration: none; }
.toc a:hover { color: var(--fg); }
.toc-h3 { padding-inline-start: 12px; }
.post-feature-links { display: flex; flex-wrap: wrap; gap: 12px 26px; margin-top: 44px; padding-top: 22px; border-top: 1px solid var(--hair2); }
.pager { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 30px 0 50px; }
.pager-status, .empty { font-size: 14px; color: var(--fg2); }

/* 404 */
.notfound { max-width: 56ch; padding: clamp(80px, 14vh, 140px) 0; }
.notfound p { margin: 20px 0 32px; color: var(--fg2); }
.cta-actions { display: flex; flex-wrap: wrap; gap: 14px; }

/* 通用：表格与清单 */
.table-wrap { overflow-x: auto; }
.compare-table { width: 100%; border-collapse: collapse; font-size: 15px; }
.compare-table th, .compare-table td { padding: 13px 10px; border-bottom: 1px solid var(--hair2); text-align: center; }
.compare-table thead th { font: 600 13px/1.4 var(--sans); letter-spacing: .2em; color: var(--fg2); border-bottom-color: var(--hair); }
.compare-table tbody th { text-align: start; font: 500 15px/1.4 var(--sans); color: var(--fg); }
.check-list { list-style: none; margin: 0; padding: 0; }
.check-list li { display: flex; gap: 10px; padding: 10px 0; border-top: 1px solid var(--hair2); color: var(--fg); }
.check-list svg { width: 17px; height: 17px; color: var(--fg); flex: none; margin-top: 4px; }

/* ==========================================================================
   横排语言（en de fr it es ko he）：标题横排，章节标横排小标，目录与长卷改成横排清单
   ========================================================================== */
[dir="rtl"] .k-demo .scene-tabs { right: auto; left: 0; }
.k-hz .k-hg .k-tag { justify-self: start; align-self: auto; }
.k-hz .k-tag { writing-mode: horizontal-tb; gap: 12px; font-size: 12px; letter-spacing: .18em; text-transform: uppercase; }
.k-hz .k-tag b { font-size: 15px; letter-spacing: .04em; }
.k-hz .k-tag::after { inline-size: 40px; background: linear-gradient(to right, var(--fg), transparent); }
[dir="rtl"].k-hz .k-tag::after { background: linear-gradient(to left, var(--fg), transparent); }
.k-hz .k-hg .k-tag { margin-bottom: 22px; }
.k-hz .k-nav { letter-spacing: .03em; }
.k-hz .k-eyebrow, .k-hz .k-sub, .k-hz .k-demo-note, .k-hz .k-scroll-list strong, .k-hz .k-stele h3 { letter-spacing: .02em; }
.k-hz .k-table thead th, .k-hz .k-incl-h, .k-hz .k-foot-h { letter-spacing: .14em; }
.k-hz .k-h2 { letter-spacing: -.005em; line-height: 1.18; }

/* 首屏：大字标居中，标题与导语在下方并排 */
.k-hz .k-hero {
  grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  grid-template-rows: auto minmax(0, 1fr) auto auto;
  row-gap: clamp(16px, 2.4vh, 28px);
  padding-bottom: clamp(56px, 8vh, 88px);
}
.k-hz .k-eyebrow { grid-column: 1 / -1; grid-row: 1; max-width: none; }
.k-hz .k-glyph-hero { grid-column: 1 / -1; grid-row: 2; align-self: center; justify-self: center; }
.k-hz .k-glyph-hero span.k-word { font-size: clamp(88px, min(15vw, 25svh), 280px); }
.k-hz .k-h1 { grid-column: 1; grid-row: 3; align-self: end; justify-self: start; font-size: clamp(38px, min(4.4vw, 7svh), 82px); line-height: 1.06; letter-spacing: -.01em; }
.k-hz .k-hero-copy { grid-column: 2; grid-row: 3; align-self: end; justify-self: end; max-width: 470px; }
.k-hz .k-phone { grid-column: 2; grid-row: 4; justify-self: end; max-width: 470px; }
.k-hz .k-cue { writing-mode: horizontal-tb; letter-spacing: .3em; text-transform: uppercase; }
.k-hz .k-cue i { inline-size: 1px; block-size: 34px; }

/* 演示：右侧两列横排目录，说明在目录下方 */
.k-hz .k-demo { --toc-row: 42px; --toc-h: calc(var(--toc-row) * 7); --aside: clamp(420px, 35vw, 540px); }
.k-hz .k-demo .scene-tabs { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); grid-auto-flow: row; grid-auto-columns: auto; width: var(--aside); direction: inherit; column-gap: 22px; border: 0; }
.k-hz .k-demo .scene-tabs::before, .k-hz .k-demo .scene-tabs::after { display: none; }
.k-hz .k-demo .scene-tabs button { writing-mode: horizontal-tb; width: auto; height: var(--toc-row); padding: 0; padding-inline-start: 16px; border: 0; border-bottom: 1px solid var(--hair2); font-size: 14.5px; letter-spacing: .02em; justify-content: flex-start; overflow: hidden; min-width: 0; }
.k-hz .k-demo .scene-tabs button[aria-selected="true"] { background: linear-gradient(to right, rgb(var(--fg-rgb) / .08), rgb(var(--fg-rgb) / 0) 80%); border-bottom-color: var(--hair); }
[dir="rtl"].k-hz .k-demo .scene-tabs button[aria-selected="true"] { background: linear-gradient(to left, rgb(var(--fg-rgb) / .08), rgb(var(--fg-rgb) / 0) 80%); }
.k-hz .k-demo .scene-tabs button span { overflow: hidden; text-overflow: ellipsis; }
.k-hz .k-toc-dot { margin: -3.5px 0 0 -3.5px; }
.k-hz .k-demo .capture-description { padding-top: calc(var(--toc-h) + clamp(44px, 6vh, 72px)); }
.k-hz .k-demo .scene-caption { letter-spacing: .14em; }

/* 各章：标签 + 标题合成一组（.k-hg）放在原竖排标题的位置 */
.k-hz .k-ch-prompts .k-hg { grid-column: 7 / 13; grid-row: 1; align-self: end; padding-bottom: calc(var(--gs) * .34); }
.k-hz .k-ch-dash .k-hg { grid-column: 1 / 9; grid-row: 1; align-self: end; z-index: 1; margin-bottom: calc(var(--gs) * .06); }
.k-hz .k-ch-dash .k-text { grid-column: 1 / 6; }
.k-hz .k-ch-ext .k-glyph { grid-column: 1 / -1; }
.k-hz .k-ch-ext .k-window { grid-column: 1 / -1; }
.k-hz .k-ch-ext .k-hg { grid-column: 2 / 12; grid-row: 2; margin-top: clamp(56px, 8vh, 96px); }
.k-hz .k-ch-ext .k-text { grid-row: 3; }
.k-hz .k-ch-mon .k-hg { grid-column: 1 / 8; grid-row: 1; align-self: center; z-index: 1; }
.k-hz .k-ch-mon .k-twin { grid-column: 1 / 13; }
.k-hz .k-stele { grid-template-columns: minmax(0, 1fr); }
.k-hz .k-ch-mcp .k-hg { grid-column: 7 / 13; grid-row: 1; align-self: center; }
.k-hz .k-ch-cat .k-hg { grid-column: 5 / 13; grid-row: 1; align-self: end; }
.k-hz .k-ch-cat .k-sub { grid-column: 5 / 12; }
.k-hz .k-ch-plat .k-hg { grid-column: 1 / 6; grid-row: 1 / 3; align-self: start; }
.k-hz .k-ch-plat .k-sub { grid-column: 7 / 13; }
.k-hz .k-ch-plat .k-table-wrap { grid-column: 7 / 13; }
.k-hz .k-ch-sync .k-hg { grid-column: 1 / 10; grid-row: 1; align-self: end; z-index: 1; }
.k-hz .k-ch-sync .k-text { grid-column: 1 / 7; }
.k-hz .k-ch-sync .k-slips { grid-column: 1 / 7; }
.k-hz .k-ch-price .k-hg { grid-column: 6 / 13; grid-row: 1; align-self: end; }
.k-hz .k-ch-blog .k-hg { grid-column: 1 / 10; grid-row: 1; }
.k-hz .k-ch-blog .k-posts { grid-column: 1 / 13; }
.k-hz .k-ch-blog > .k-link { grid-column: 1 / 8; }
.k-hz .k-faq-side { grid-template-columns: minmax(0, 1fr); grid-template-rows: auto auto; }
.k-hz .k-faq-side .k-glyph { grid-column: 1; grid-row: 1; }
.k-hz .k-faq-side .k-hg { grid-column: 1; grid-row: 2; margin-top: 28px; }
.k-hz .k-faq-side .k-h2 { letter-spacing: -.005em; margin-top: 0; font-size: clamp(28px, 2.6vw, 46px); }

/* 功能目录：三列横排索引 */
.k-hz .k-scroll { writing-mode: horizontal-tb; overflow: visible; cursor: auto; padding: 0 var(--gut); -webkit-mask-image: none; mask-image: none; }
.k-hz .k-scroll-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-bottom: 0; }
.k-hz .k-scroll-list li { border: 0; border-bottom: 1px solid var(--hair2); border-inline-end: 1px solid var(--hair2); }
.k-hz .k-scroll-list li:nth-child(3n) { border-inline-end: 0; }
.k-hz .k-scroll-list a, .k-hz .k-nolink { display: grid; grid-template-columns: 52px minmax(0, 1fr); column-gap: 4px; inline-size: auto; block-size: 100%; padding: 26px 22px 26px 6px; }
.k-hz .k-scroll-list b { grid-row: 1 / 3; margin: 6px 0 0; letter-spacing: .04em; }
.k-hz .k-scroll-list strong { font-size: 19px; line-height: 1.4; }
.k-hz .k-scroll-list span { margin-block-start: 8px; letter-spacing: 0; }
.k-hz .k-scroll-list a::before, .k-hz .k-nolink::before { left: auto; inset-inline-end: 14px; top: 34px; }

/* 同步要点与套餐名：横排 */
.k-hz .k-slips { flex-direction: column; gap: 10px; }
.k-hz .k-slips::before, .k-hz .k-slips::after { display: none; }
.k-hz .k-slips li { writing-mode: horizontal-tb; min-height: 0; width: auto; padding: 16px 20px; letter-spacing: .02em; line-height: 1.35; background: linear-gradient(to bottom, rgb(var(--fg-rgb) / .07), rgb(var(--fg-rgb) / .015)); }
.k-hz .k-stick-name { writing-mode: horizontal-tb; margin: 22px 0 auto; font-size: clamp(26px, 2.2vw, 36px); letter-spacing: 0; }
.k-hz .k-stick-cr small { letter-spacing: .06em; }
.k-hz .k-qa summary { letter-spacing: 0; }

/* ==========================================================================
   动效状态（只在 html.js 下生效；无 JS 时内容直接可读）
   ========================================================================== */
html.js .k-hero .k-c { display: inline-block; opacity: 0; transform: translateY(.4em); transition: opacity 1s var(--ease), transform 1.2s var(--ease); transition-delay: calc(var(--i) * 90ms); }
html.js.k-hz .k-hero .k-c { transform: translateY(.3em); transition-delay: calc(var(--i) * 120ms); }
html.js .k-hero.is-on .k-c { opacity: 1; transform: none; }
html.js .k-hero :is(.k-eyebrow, .k-lead, .k-actions, .k-meta, .k-phone, .k-cue) { opacity: 0; transform: translateY(16px); transition: opacity 1.3s var(--ease), transform 1.5s var(--ease); }
html.js .k-hero.is-on :is(.k-eyebrow, .k-lead, .k-actions, .k-meta, .k-phone, .k-cue) { opacity: 1; transform: none; }
html.js .k-hero.is-on .k-eyebrow { transition-delay: .5s; }
html.js .k-hero.is-on .k-lead { transition-delay: 1.15s; }
html.js .k-hero.is-on .k-actions { transition-delay: 1.35s; }
html.js .k-hero.is-on .k-meta { transition-delay: 1.55s; }
html.js .k-hero.is-on .k-phone { transition-delay: 1.65s; }
html.js .k-hero.is-on .k-cue { transition-delay: 2.2s; }
html.js .k-hero.is-on .k-cue { transform: translateX(-50%); }
html.js .k-hero .k-cue { transform: translate(-50%, 16px); }
html.js .k-glyph-hero span { opacity: 0; transition: opacity 2.6s ease; }
html.js .k-hero.is-lit .k-glyph-hero span { opacity: 1; }

html.js .k-rv { opacity: 0; transform: translateY(30px); transition: opacity 1.1s var(--ease), transform 1.4s var(--ease); transition-delay: var(--d, 0s); }
html.js .k-rv.is-in { opacity: 1; transform: none; }
html.js .k-gw span { opacity: 0; transition: opacity 1.8s ease; }
html.js .k-gw.is-in span { opacity: 1; }
html.js:not(.k-hz) .k-scroll-wrap.k-rv .k-scroll { clip-path: inset(0 0 0 100%); transition: clip-path 2.4s var(--ease) .2s; }
html.js:not(.k-hz) .k-scroll-wrap.k-rv.is-in .k-scroll { clip-path: inset(0 0 0 0); }

/* 切换场景：新窗口淡入上浮 */
html.js .k-demo [data-scene]:not([hidden]) .fx-frame { animation: k-emerge 1s var(--ease) both; }
html.js .k-demo [data-scene]:not([hidden]) .capture-description { animation: k-rise .9s var(--ease) .12s both; }
@keyframes k-emerge { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@keyframes k-rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

/* 问答平滑展开 */
@supports (interpolate-size: allow-keywords) {
  :root { interpolate-size: allow-keywords; }
  .k-qa::details-content, .faq details::details-content { block-size: 0; overflow: clip; transition: block-size .6s var(--ease), content-visibility .6s allow-discrete; }
  .k-qa[open]::details-content, .faq details[open]::details-content { block-size: auto; }
}

/* ==========================================================================
   响应式
   ========================================================================== */
@media (min-width: 1180px) {
  .k-hz .k-ch-faq { --gs: min(40svh, 22vw); }
}
@media (min-width: 1600px) {
  .k-demo { --toc-col: 34px; --toc-h: 200px; }
  .k-demo .scene-tabs button { font-size: 16px; }
  .k-hz .k-demo { --toc-h: calc(var(--toc-row) * 7); }
}

@media (max-width: 1279px) {
  .k-nav > a.k-nav-guides { display: none; }
  .plan-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* 平板：大字与标题并排，其余顺流而下 */
@media (max-width: 1179px) {
  .k-hero { --gs: min(60svh, 52vw); grid-template-columns: var(--gs) minmax(0, 1fr); grid-template-rows: auto auto auto auto; row-gap: 28px; min-height: 0; padding-bottom: 72px; }
  .k-eyebrow { grid-column: 1 / -1; grid-row: 1; }
  .k-glyph-hero { grid-column: 1; grid-row: 2; justify-self: start; }
  .k-h1 { grid-column: 2; grid-row: 2; justify-self: center; font-size: clamp(34px, 5.4vw, 60px); }
  .k-hero-copy { grid-column: 1; grid-row: 3; max-width: 460px; }
  .k-phone { grid-column: 2; grid-row: 3; justify-self: end; }
  .k-cue { display: none; }
  .k-hz .k-hero { grid-template-columns: minmax(0, 1fr); }
  .k-hz .k-glyph-hero { grid-column: 1; justify-self: center; }
  .k-hz .k-glyph-hero span.k-word { font-size: clamp(80px, 16vw, 190px); }
  .k-hz .k-h1 { grid-column: 1; grid-row: 3; justify-self: start; font-size: clamp(38px, 6.4vw, 64px); }
  .k-hz .k-hero-copy { grid-column: 1; grid-row: 4; justify-self: start; }
  .k-hz .k-phone { grid-column: 1; grid-row: 5; justify-self: start; }

  .k-demo .scene-tabs, [dir="rtl"] .k-demo .scene-tabs { position: relative; right: auto; left: auto; margin: 0 auto 56px; width: max-content; max-width: 100%; }
  .k-hz .k-demo .scene-tabs { width: min(100%, 640px); margin: 0 auto 48px; }
  .k-demo .capture-layout { grid-template-columns: minmax(0, 1fr); }
  .k-demo .capture-description { grid-column: 1; grid-row: 2; max-width: 600px; margin: 56px auto 0; padding-top: 0 !important; text-align: center; }
  .k-demo .scene-caption { width: auto; }

  .k-ch { --gs: min(46vw, 56svh); grid-template-columns: var(--gs) minmax(0, 1fr); column-gap: clamp(24px, 4vw, 48px); padding-block: clamp(96px, 13vh, 150px); }
  .k-ch > * { grid-column: 1 / -1 !important; grid-row: auto !important; margin: 0 !important; justify-self: stretch !important; align-self: start !important; padding: 0 !important; }
  .k-ch .k-tag { order: -1; writing-mode: horizontal-tb; margin-bottom: 36px !important; justify-self: start !important; }
  .k-ch .k-tag::after { inline-size: 48px; block-size: 1px; background: linear-gradient(to right, var(--fg), transparent); }
  .k-hz .k-hg .k-tag { margin-bottom: 18px !important; }
  .k-ch .k-glyph { grid-column: 1 !important; justify-self: start !important; }
  .k-ch .k-glyph + .k-tag + .k-h2, .k-ch .k-glyph ~ .k-h2.k-v, .k-ch .k-glyph + .k-hg { grid-column: 2 !important; align-self: center !important; justify-self: start !important; }
  .k-ch .k-h2:not(.k-v) { font-size: clamp(30px, 4.6vw, 48px); }
  .k-ch .k-text, .k-ch .k-window, .k-twin, .k-mcp-fig, .k-sticks, .k-incl, .k-slips, .k-table-wrap, .k-posts, .k-scroll-wrap { margin-top: 56px !important; }
  .k-ch .k-window { max-width: 680px; justify-self: center !important; width: 100%; }
  .k-ch-ext { --gs: min(70vw, 66svh); }
  .k-ch-ext .k-glyph { grid-column: 1 / -1 !important; justify-self: center !important; }
  .k-ch-ext .k-tag { grid-row: 1 !important; }
  .k-ch-ext .k-glyph { grid-row: 2 !important; }
  .k-ch-ext .k-window { grid-row: 3 !important; margin-top: calc(var(--gs) * -0.42) !important; width: min(100%, 420px) !important; }
  .k-ch-ext .k-h2, .k-ch.k-ch-ext .k-glyph + .k-tag + .k-h2, .k-hz .k-ch-ext .k-hg { grid-row: 4 !important; grid-column: 1 / -1 !important; writing-mode: horizontal-tb; margin-top: 64px !important; }
  .k-ch-ext .k-h2 { font-size: clamp(30px, 4.6vw, 48px); }
  .k-ch-ext .k-text { grid-row: 5 !important; grid-template-columns: minmax(0, 1fr); }
  .k-ch-ext .k-text > * { grid-column: 1 !important; grid-row: auto !important; }
  .k-scroll-wrap { margin-inline: calc(var(--gut) * -1) !important; }
  .k-ch-plat .k-h2, .k-hz .k-ch-plat .k-hg { grid-column: 1 / -1 !important; justify-self: start !important; }
  .k-ch-plat .k-sub { margin-top: 32px !important; }
  .k-ch-sync .k-h2, .k-ch-cat .k-h2 { grid-column: 2 !important; align-self: center !important; }
  .k-ch-cat .k-sub { grid-column: 1 / -1 !important; margin-top: 28px !important; }
  .k-hz .k-scroll-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .k-hz .k-scroll-list li:nth-child(3n) { border-inline-end: 1px solid var(--hair2); }
  .k-hz .k-scroll-list li:nth-child(2n) { border-inline-end: 0; }
  .k-faq-side { position: relative; top: 0; }
  .k-qa-list { margin-top: 48px !important; }
  .k-posts { grid-template-columns: minmax(0, 1fr); }
  .k-posts li { border-inline-start: 0; border-top: 1px solid var(--hair2); padding-block: 14px; }
  .k-cta { grid-template-columns: minmax(0, 1fr); }
  .k-cta > * { justify-self: center !important; }
  .k-cta .k-h2 { margin-top: calc(var(--gs) * -0.08) !important; }
  .k-cta .k-cta-act { margin-top: 44px !important; }
  .k-foot { grid-template-columns: minmax(0, 1fr); }

  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .post-layout { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .post-layout .toc { order: 0; position: static; max-height: none; margin-top: 28px; }
}

/* 手机：导航收进菜单 */
@media (max-width: 860px) {
  .k-nav { display: none; }
  html.js .k-nav { position: fixed; top: var(--head); left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 0; margin: 0; padding: 12px var(--gut) 24px; background: rgb(var(--bg-rgb) / .98); border-bottom: 1px solid var(--hair2); font-size: 16px; max-height: calc(100svh - var(--head)); overflow-y: auto; }
  html.js .k-head.is-open .k-nav { display: flex; }
  .k-nav > a, .k-drop > summary { padding: 14px 0; border-bottom: 1px solid var(--hair2); }
  .k-nav > a.k-nav-guides { display: block; }
  .k-nav-web { border-inline-start: 0 !important; padding-inline-start: 0 !important; }
  .k-drop ul { position: static; box-shadow: none; border: 0; background: none; padding: 4px 0 8px; padding-inline-start: 14px; }
    html.js .k-menu-btn { display: inline-flex; align-items: center; gap: 10px; margin-inline-start: auto; padding: 8px 2px; background: none; border: 0; color: var(--fg); font: 500 14px/1 var(--sans); letter-spacing: .2em; cursor: pointer; }
  .k-menu-btn i { position: relative; width: 18px; height: 1px; background: currentColor; }
  .k-menu-btn i::before { content: ""; position: absolute; left: 0; right: 0; top: -5px; height: 1px; background: currentColor; transition: transform .3s; }
  .k-head.is-open .k-menu-btn i { background: transparent; }
  .k-head.is-open .k-menu-btn i::before { transform: translateY(5px) rotate(45deg); }
  .k-head.is-open .k-menu-btn i::after { content: ""; position: absolute; left: 0; right: 0; top: 0; height: 1px; background: currentColor; transform: rotate(-45deg); }
  .k-head { gap: 14px; }
  /* 无 JS：导航作为页眉下方的一行可换行链接 */
  html:not(.js) .k-head { position: absolute; height: auto; min-height: var(--head); flex-wrap: wrap; padding-block: 14px; }
  html:not(.js) .k-nav { display: flex; flex-wrap: wrap; order: 3; width: 100%; margin: 0; gap: 4px 18px; }
  html:not(.js) .k-nav > a, html:not(.js) .k-drop > summary { border: 0; padding: 6px 0; }
  html:not(.js) .k-head-dl { margin-inline-start: auto; }
  html:not(.js) .k-page main { padding-top: 150px; }

  .grid-2, .grid-3 { grid-template-columns: minmax(0, 1fr); }
  .capture-layout { grid-template-columns: minmax(0, 1fr); }
  .capture-description { max-width: none; text-align: start; }
  .release { grid-template-columns: minmax(0, 1fr); gap: 10px; }
}

@media (max-width: 780px) {
  :root { --head: 62px; }
  .k-glyph-hero span.k-word { font-size: calc(var(--gs) * .25); }
  .k-head-dl { min-height: 34px !important; padding: 0 12px !important; font-size: 13px !important; }
  .k-hero { --gs: min(64vw, 44svh); grid-template-columns: minmax(0, 1fr) auto; column-gap: 12px; row-gap: 26px; padding: calc(var(--head) + 26px) 20px 56px; }
  .k-glyph-hero { justify-self: start; }
  .k-h1 { grid-column: 2; justify-self: end; font-size: clamp(28px, 8.2vw, 40px); letter-spacing: .06em; }
  .k-hero-copy { grid-column: 1 / -1; max-width: none; }
  .k-phone { grid-column: 1 / -1; grid-row: 4; justify-self: start; max-width: none; }
  .k-hz .k-hero { grid-template-columns: minmax(0, 1fr); }
  .k-hz .k-glyph-hero { grid-column: 1; justify-self: center; }
  .k-hz .k-glyph-hero span.k-word { font-size: clamp(64px, 21vw, 150px); }
  .k-hz .k-h1 { grid-column: 1; justify-self: start; font-size: clamp(34px, 10vw, 52px); letter-spacing: -.01em; }
  .k-hz .k-hero-copy { grid-row: 4; }
  .k-hz .k-phone { grid-row: 5; }
  .k-actions { gap: 12px 18px; }
  .k-actions .k-btn-solid, .k-actions .k-btn-line { flex: 1 1 auto; }

  .k-demo { padding: 96px 20px 120px; }
  .k-demo-head { gap: 18px; }
  .k-demo-head .k-tag { display: none; }
  .k-demo .scene-tabs, .k-hz .k-demo .scene-tabs {
    position: relative; display: flex; direction: ltr; width: auto; max-width: none; margin: 0 -20px 34px; padding: 4px 20px 26px;
    border: 0; overflow-x: auto; scrollbar-width: none;
    -webkit-mask-image: linear-gradient(to right, transparent, #000 20px, #000 calc(100% - 40px), transparent);
    mask-image: linear-gradient(to right, transparent, #000 20px, #000 calc(100% - 40px), transparent);
  }
  [dir="rtl"] .k-demo .scene-tabs { direction: rtl; }
  .k-demo .scene-tabs::-webkit-scrollbar { display: none; }
  .k-demo .scene-tabs::before, .k-demo .scene-tabs::after { display: none; }
  .k-demo .scene-tabs button, .k-hz .k-demo .scene-tabs button { writing-mode: horizontal-tb; flex: none; width: auto; height: auto; padding: 12px 14px; border: 0; border-bottom: 1px solid var(--hair2); font-size: 14px; letter-spacing: .06em; gap: 8px; overflow: visible; }
  .k-demo .scene-tabs button[aria-selected="true"], .k-hz .k-demo .scene-tabs button[aria-selected="true"] { border-bottom-color: var(--fg); background: none; }
  .k-toc-dot, .k-hz .k-toc-dot { margin: 6px 0 0 -3.5px; }
  .k-demo .capture-description { margin-top: 44px; text-align: start; }

  .k-ch { --gs: min(70vw, 50svh); grid-template-columns: minmax(0, 1fr) auto; column-gap: 14px; padding: 92px 20px; }
  .k-ch .k-glyph { justify-self: start !important; }
  .k-ch .k-glyph + .k-tag + .k-h2:not(.k-v), .k-ch .k-glyph + .k-hg { grid-column: 1 / -1 !important; margin-top: calc(var(--gs) * -0.16) !important; }
  .k-ch .k-glyph ~ .k-h2.k-v { justify-self: end !important; font-size: clamp(24px, 6.6vw, 32px); }
  .k-ch .k-h2:not(.k-v) { font-size: clamp(26px, 7.4vw, 36px); }
  .k-ch-dash .k-glyph, .k-ch-mon .k-glyph, .k-ch-sync .k-glyph { justify-self: end !important; grid-column: 1 / -1 !important; }
  .k-hz .k-ch .k-glyph + .k-hg { margin-top: calc(var(--gs) * -0.02) !important; }
  .k-ch-ext { --gs: min(92vw, 62svh); }
  .k-ch-ext .k-window { margin-top: calc(var(--gs) * -0.4) !important; }
  .k-ch-ext .k-h2 { font-size: clamp(24px, 7vw, 34px); }
  .k-ch .k-window .fx-frame { max-width: 100%; }
  .k-twin { grid-template-columns: minmax(0, 1fr); }
  .k-stele + .k-stele { border-inline-start: 0; border-top: 1px solid var(--hair); }
  .k-stele { padding: 32px 0; gap: 20px; }
  .k-stele h3 { font-size: 26px; }
  .k-ch-plat .k-h2 { writing-mode: horizontal-tb; font-size: clamp(26px, 7.4vw, 36px); line-height: 1.4; letter-spacing: .02em; }
  .k-table th, .k-table td { padding: 13px 6px; font-size: 14px; }
  .k-table thead th { letter-spacing: .08em; font-size: 12px; }
  .k-table tbody th { font-size: 14.5px; }
  .k-bridge { font-size: 12px; }
  .k-scroll { writing-mode: horizontal-tb; overflow: visible; padding: 0 20px; cursor: auto; -webkit-mask-image: none; mask-image: none; }
  .k-scroll-list, .k-hz .k-scroll-list { display: flex; flex-direction: column; border: 0; }
  .k-scroll-list li, .k-hz .k-scroll-list li { border: 0; border-top: 1px solid var(--hair2); }
  .k-hz .k-scroll-list li:nth-child(3n) { border-inline-end: 0; }
  .k-scroll-list li:first-child { border-top-color: var(--hair); }
  .k-scroll-list li:last-child { border-bottom: 1px solid var(--hair); }
  .k-scroll-list a, .k-nolink, .k-hz .k-scroll-list a, .k-hz .k-nolink { display: grid; grid-template-columns: 46px minmax(0, 1fr); column-gap: 6px; inline-size: auto; block-size: auto; padding: 18px 4px; }
  .k-scroll-list b { grid-row: 1 / 3; margin: 4px 0 0; }
  .k-scroll-list strong { font-size: 18px; }
  .k-scroll-list span { margin: 4px 0 0; }
  .k-scroll-list a::before, .k-nolink::before { left: auto; inset-inline-end: 6px; top: 26px; }
  .k-scroll-ctrl { display: none !important; }
  html.js .k-scroll-wrap.k-rv .k-scroll { clip-path: none; }
  .k-slips { flex-direction: column; gap: 10px; }
  .k-slips::before, .k-slips::after { display: none; }
  .k-slips li { writing-mode: horizontal-tb; min-height: 0; width: auto; padding: 16px 18px; line-height: 1.35; background: linear-gradient(to bottom, rgb(var(--fg-rgb) / .07), rgb(var(--fg-rgb) / .015)); }
  .k-sticks { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px 14px; }
  .k-sticks::after { display: none; }
  .k-stick { min-height: 330px; padding-top: 34px; border-bottom-color: var(--hair); border-radius: 50% 50% 3px 3px / 8% 8% 3px 3px; }
  .k-stick-name { font-size: 30px; }
  .k-hz .k-stick-name { font-size: 24px; }
  .k-stick-cr b { font-size: 34px; }
  .k-incl { grid-template-columns: minmax(0, 1fr); }
  .k-incl > * { grid-column: 1 !important; }
  .k-incl li { padding: 0 12px; }
  .k-faq-side { grid-template-columns: auto auto; }
  .k-qa summary { grid-template-columns: 30px minmax(0, 1fr) 18px; padding: 22px 0; font-size: 17.5px; }
  .k-a p { padding: 0 8px 26px; padding-inline-start: 42px; font-size: 15px; }
  .k-posts a { padding: 8px 0 8px 4px; }
  .k-cta { --gs: min(80vw, 46svh); }
  .k-cta-act .k-btn-solid { width: 100%; }
  .k-cta-act { column-gap: 18px; }
  .k-foot { padding: 64px 20px 36px; gap: 40px; }
  .k-foot-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .page-head h1, .legal h1, .notfound h1 { font-size: clamp(32px, 9vw, 44px); }
  .plan-grid { grid-template-columns: minmax(0, 1fr); }
  .feature-hero-actions .btn { flex: 1 1 auto; }
  .k-band .k-actions .btn, .k-band .k-actions .k-btn { flex: 1 1 auto; }
}

@media (max-width: 420px) {
  .k-actions .k-btn-text { flex-basis: 100%; justify-content: flex-start; }
  .k-foot-langs { gap: 6px 16px; }
}

/* 无 JS：大字直接静态显示 */
html:not(.js) .k-glyph span:not([data-icon]):not(.k-word) { color: rgb(var(--fg-rgb) / .1); -webkit-text-stroke: 1px rgb(var(--fg-rgb) / .3); }
html:not(.js) .k-glyph span[data-icon] svg { stroke: rgb(var(--fg-rgb) / .5); stroke-width: 2px; }

/* ==========================================================================
   减少动效：不做入场动画，大字静态显示；所有内容直接可读
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html.js .k-glyph-hero span, html.js .k-hero.is-lit .k-glyph-hero span { opacity: 1; }
  .k-glyph span:not([data-icon]):not(.k-word) { color: rgb(var(--fg-rgb) / .1); -webkit-text-stroke: 1px rgb(var(--fg-rgb) / .3); }
  .k-glyph span[data-icon] svg { stroke: rgb(var(--fg-rgb) / .5); stroke-width: 2px; }
  html.js .k-hero .k-c, html.js .k-hero :is(.k-eyebrow, .k-lead, .k-actions, .k-meta, .k-phone, .k-cue) { opacity: 1 !important; filter: none !important; transform: none !important; transition: none !important; }
  html.js .k-hero .k-cue { transform: translateX(-50%) !important; }
  html.js .k-rv { opacity: 1; transform: none; transition: none; }
  html.js .k-gw span { opacity: 1; transition: none; }
  html.js .k-scroll-wrap.k-rv .k-scroll { clip-path: none; }
  html.js .k-demo [data-scene]:not([hidden]) .fx-frame, html.js .k-demo [data-scene]:not([hidden]) .capture-description { animation: none; }
  .k-cue i::after { animation: none; }
  .k-toc-dot, .k-stick, .k-btn, .btn, .k-link, .k-link i, .text-link, .card, .plan-card { transition: none; }
  .k-stick:hover { transform: none; }
  .k-qa::details-content, .faq details::details-content { transition: none !important; }
}