/* ==========================================================================
   A.R.E · Adaptive Rewrite Engine 宣传站样式
   设计规范：/root/platform/DESIGN.md（参照 microsoft.com 产品页）
   不依赖任何外部字体或 CDN
   ========================================================================== */

/* ---------- 1. 令牌 ---------- */
:root {
  color-scheme: light;

  /* 站点外壳 */
  --ink: #171717;
  --ink-2: #4A4A4A;
  --ink-3: #616161;
  --line: #D2D2D2;
  --line-2: #E6E6E6;
  --surface: #FFFFFF;
  --surface-2: #F2F2F2;
  --accent: #0067B8;
  --accent-hover: #005DA6;
  --accent-pressed: #004E8C;
  --accent-tint: #EBF3FB;

  --font: "Segoe UI Variable Text", "Segoe UI", -apple-system, BlinkMacSystemFont,
          "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", "Hiragino Sans GB",
          "Noto Sans CJK SC", "Noto Sans SC", "Source Han Sans SC", sans-serif;
  --font-display: "Segoe UI Variable Display", "Segoe UI", -apple-system, BlinkMacSystemFont,
          "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --font-doc: "Times New Roman", "Songti SC", "Noto Serif CJK SC", "Source Han Serif SC", "SimSun", serif;

  --fs-display: clamp(36px, 4.4vw, 54px);
  --fs-h2: clamp(28px, 3vw, 38px);
  --fs-h3: clamp(22px, 2.1vw, 28px);
  --fs-lead: clamp(17px, 1.5vw, 20px);

  --section-y: clamp(64px, 8vw, 112px);
  --r-control: 4px;
  --r-card: 8px;
  --r-media: 12px;
  --elev-hover: 0 2px 4px rgba(0,0,0,.04), 0 8px 24px rgba(0,0,0,.08);
  --elev-window: 0 1px 3px rgba(0,0,0,.06), 0 16px 40px rgba(0,0,0,.12);
  --dur: 150ms;
  --ease: cubic-bezier(.33, 0, .67, 1);
  --ease-out: cubic-bezier(.1, .9, .2, 1);

  --maxw: 1240px;
  --gutter: clamp(16px, 4vw, 40px);
  --nav-h: 56px;

  /* 界面示意图（软件 UI）专用 */
  --brand: #0067B8;
  --brand-pressed: #004E8C;
  --brand-strong: #005A9E;
  --brand-50: #EBF3FB;
  --brand-300: #6CB0E6;
  --brand-400: #2B88D8;
  --fg-4: #707070;
  --stroke-1: #D1D1D1;
  --bg-soft: #F2F2F2;
  --select: rgba(0, 103, 184, .2);
  --protect: #FFF0A8;
  --bad: #C50F1F;
  --ok: #107C10;
  --ok-text: #0E700E;
  --ok-line: #13A10E;
  --ok-bg: #F1FAF1;
  --warn-bg: #FFF4CE;
  --warn-line: #FFB900;
  --warn-text: #835B00;
  --score-1: #13A10E;
  --score-2: #8CBD18;
  --score-3: #FFB900;
  --score-4: #F7630C;
  --score-5: #D13438;
  --shadow-2: 0 0 2px rgba(0,0,0,.12), 0 1px 2px rgba(0,0,0,.14);
  --shadow-16: 0 0 2px rgba(0,0,0,.12), 0 8px 16px rgba(0,0,0,.14);
}

/* ---------- 2. 基础 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
}
body {
  margin: 0;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img, svg, video { display: block; max-width: 100%; }
h1, h2, h3, h4, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
fieldset { margin: 0; padding: 0; border: 0; min-width: 0; }
legend { padding: 0; }
[hidden] { display: none !important; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--ink); outline-offset: 2px; }
h1, h2, h3 { text-wrap: balance; }
p { text-wrap: pretty; }
::selection { background: #CDE3F5; }

.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; }
.skip-link { position: absolute; left: 16px; top: -48px; z-index: 100; padding: 8px 16px; background: var(--ink); color: #fff; transition: top .2s var(--ease); }
.skip-link:focus { top: 8px; }

.container { width: 100%; max-width: calc(var(--maxw) + var(--gutter) * 2); margin-inline: auto; padding-inline: var(--gutter); }
.ph { display: inline-block; }
.keys { white-space: nowrap; }
.br-md { display: none; }

.i { width: 20px; height: 20px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }

kbd {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 22px; height: 22px; padding: 0 6px;
  border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 4px;
  background: #fff; color: var(--ink);
  font-family: var(--font); font-size: 12px; font-weight: 600; line-height: 1;
  vertical-align: 1px;
}

/* ---------- 3. 按钮与链接 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 40px; padding: 0 20px;
  border: 1px solid transparent; border-radius: var(--r-control);
  font-size: 15px; font-weight: 600; line-height: 1.2; white-space: nowrap;
  text-decoration: none !important;
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary:active { background: var(--accent-pressed); }
.btn-secondary { background: #fff; border-color: var(--ink); color: var(--ink); }
.btn-secondary:hover { background: var(--surface-2); }
.btn-secondary:active { background: #E6E6E6; }
.btn-sm { min-height: 32px; padding: 0 14px; font-size: 14px; }
.btn-lg { min-height: 48px; padding: 0 28px; font-size: 16px; }
.btn[disabled] { opacity: .6; pointer-events: none; }

.link-more { display: inline-flex; align-items: center; gap: 4px; color: var(--accent); font-size: 16px; font-weight: 600; }
.link-more .i { width: 16px; height: 16px; stroke-width: 2; transition: transform var(--dur) var(--ease); }
.link-more:hover .i { transform: translateX(3px); }

/* ---------- 4. 本地导航 ---------- */
.nav { position: sticky; top: 0; z-index: 50; background: #fff; border-bottom: 1px solid var(--line-2); }
.nav-inner { display: flex; align-items: center; gap: 28px; height: var(--nav-h); }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none !important; line-height: 1; }
.brand-logo { width: 30px; height: 30px; }
.brand-name { font-size: 18px; font-weight: 600; letter-spacing: .02em; }
.brand-sep { width: 1px; height: 20px; background: var(--line); }
.brand-full { color: var(--ink-3); font-size: 14px; }
.nav-links { display: flex; align-items: stretch; gap: 4px; height: 100%; }
.nav-links a { position: relative; display: flex; align-items: center; padding: 0 10px; color: var(--ink); font-size: 14px; }
.nav-links a:hover { text-decoration: underline; }
.nav-links a.is-active::after { content: ""; position: absolute; left: 10px; right: 10px; bottom: -1px; height: 2px; background: var(--ink); }
.nav-cta { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.nav-toggle { display: none; align-items: center; justify-content: center; width: 40px; height: 40px; border: 0; border-radius: var(--r-control); background: transparent; color: var(--ink); }
.nav-toggle:hover { background: var(--surface-2); }

/* ---------- 5. 首屏 ---------- */
.hero { position: relative; isolation: isolate; padding-top: clamp(48px, 6.5vw, 88px); }
.hero::after { content: ""; position: absolute; z-index: -1; left: 0; right: 0; bottom: 0; height: clamp(96px, 16vw, 240px); background: var(--surface-2); }
.hero-top { display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: clamp(32px, 5vw, 80px); }
.hero-copy { max-width: 760px; }
.hero-logo { display: flex; justify-content: center; padding-right: clamp(0px, 3vw, 56px); }
.hero-logo img { width: clamp(220px, 22vw, 300px); height: auto; }
.eyebrow { color: var(--ink); font-size: 16px; font-weight: 600; }
.hero h1 { margin-top: 14px; font-family: var(--font-display); font-size: var(--fs-display); font-weight: 600; line-height: 1.15; }
.hero .lead { max-width: 660px; margin-top: 20px; color: var(--ink-2); font-size: var(--fs-lead); line-height: 1.65; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 16px 28px; margin-top: 32px; }
.hero-meta { margin-top: 24px; color: var(--ink-3); font-size: 14px; }
.hero-meta span + span::before { content: "·"; margin: 0 10px; color: var(--line); }
.hero-media { margin-top: clamp(40px, 5.5vw, 64px); }
.stage-frame { overflow: hidden; border-radius: var(--r-card); background: #fff; box-shadow: 0 0 0 1px rgba(0,0,0,.08), var(--elev-window); }
.stage-video { width: 100%; height: auto; aspect-ratio: 16 / 10; object-fit: cover; }

/* ---------- 6. 等比缩放容器 ---------- */
.scaler { position: relative; width: 100%; aspect-ratio: var(--w) / var(--h); overflow: hidden; }
.scaler-inner { position: absolute; left: 0; top: 0; width: calc(var(--w) * 1px); height: calc(var(--h) * 1px); transform: scale(var(--s, 1)); transform-origin: 0 0; }
.js .scaler:not(.is-ready) .scaler-inner { visibility: hidden; }

/* ---------- 7. 板块通用 ---------- */
.section { padding-block: var(--section-y); }
.section--alt { background: var(--surface-2); }
.section-head { max-width: 820px; margin: 0 auto clamp(40px, 5vw, 64px); text-align: center; }
.section-head.is-left { margin-left: 0; text-align: left; }
.h2 { font-family: var(--font-display); font-size: var(--fs-h2); font-weight: 600; line-height: 1.25; }
.section-sub { margin-top: 16px; color: var(--ink-2); font-size: 18px; line-height: 1.7; }

.js .reveal { opacity: 0; transform: translateY(12px); transition: opacity .6s var(--ease-out), transform .6s var(--ease-out); transition-delay: var(--delay, 0ms); }
.js .reveal.is-in { opacity: 1; transform: none; }

/* ---------- 8. 功能模块（图文交替） ---------- */
.feature { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: clamp(32px, 6vw, 88px); align-items: center; }
.feature + .feature { margin-top: clamp(72px, 9vw, 120px); }
.feature.is-reverse { grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); }
.feature.is-reverse .feature-copy { order: 2; }
.feature-copy h3 { font-family: var(--font-display); font-size: var(--fs-h3); font-weight: 600; line-height: 1.35; }
.feature-copy > p { margin-top: 16px; color: var(--ink-2); font-size: 17px; line-height: 1.75; }
.bullets { margin-top: 20px; padding-left: 1.2em; list-style: disc; }
.bullets li { color: var(--ink-2); font-size: 15.5px; line-height: 1.75; }
.bullets li + li { margin-top: 6px; }
.bullets li::marker { color: var(--ink-3); }
.feature-copy > .meta-line { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; margin-top: 24px; color: var(--ink-3); font-size: 14px; }
.meta-line .keys { display: inline-flex; align-items: center; gap: 4px; }
.meta-line .plus { color: var(--ink-3); font-size: 12px; }
.feature-copy > .feature-note { margin-top: 16px; color: var(--ink-3); font-size: 13px; line-height: 1.7; }
.media { overflow: hidden; border-radius: var(--r-media); background: var(--surface-2); }
.visual { overflow: hidden; border-radius: var(--r-media); background: var(--surface-2); }

/* ---------- 9. 界面示意图（软件 UI，固定虚拟尺寸，由 .scaler 等比缩放） ---------- */
.v { position: relative; width: 100%; height: 100%; color: #242424; font-family: var(--font); line-height: 1.6; }
.v > .abs { position: absolute; }

.v-page {
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 0 0 1px rgba(0,0,0,.04), 0 6px 18px rgba(0,0,0,.06);
  padding: 26px 30px;
  font-family: var(--font-doc);
  font-size: 15px;
  line-height: 1.95;
  color: #1F1F1F;
}
.v-h { font-family: var(--font); font-size: 15px; font-weight: 700; line-height: 1.6; margin-bottom: 8px; }
.v-p { position: relative; text-indent: 2em; text-align: justify; }
.v-p + .v-p { margin-top: 10px; }

.v-card {
  background: #fff;
  border: 1px solid rgba(0,0,0,.05);
  border-radius: 10px;
  box-shadow: 0 0 2px rgba(0,0,0,.10), 0 14px 32px rgba(0,0,0,.12);
  padding: 16px;
  font-size: 13px;
  line-height: 1.6;
}
.v-card-title { display: flex; align-items: center; gap: 8px; font-size: 13.5px; font-weight: 600; }
.v-card-title .i { width: 16px; height: 16px; color: var(--brand); }
.v-card-title .muted { margin-left: auto; color: var(--fg-4); font-weight: 400; font-size: 12px; }

.m-sel { background: var(--select); -webkit-box-decoration-break: clone; box-decoration-break: clone; }
.m-prot {
  background: var(--protect);
  border-radius: 3px;
  padding: 1px 3px;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}
.m-prot .lk {
  display: inline-block;
  width: 11px; height: 11px;
  margin-right: 2px;
  vertical-align: -1px;
  color: #8A6D00;
  stroke-width: 2;
}
.m-del { color: var(--bad); text-decoration: line-through; text-decoration-color: rgba(209,52,56,.85); }
.m-ins {
  color: var(--ok-text);
  text-decoration: underline;
  text-decoration-color: var(--ok-line);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 4px;
}
.m-check {
  background: var(--warn-bg);
  box-shadow: inset 0 -2px 0 var(--warn-line);
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

/* 小按钮（示意图内） */
.ab {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 28px;
  padding: 0 10px;
  border: 1px solid var(--stroke-1);
  border-radius: 4px;
  background: #fff;
  color: #242424;
  font-family: var(--font);
  font-size: 12px;
  line-height: 1;
  white-space: nowrap;
  transition: background-color .15s, transform .15s, border-color .15s;
}
.ab .i { width: 14px; height: 14px; }
.ab-primary { border-color: var(--brand); background: var(--brand); color: #fff; }
.ab-icon { padding: 0 7px; }

.chip {
  display: inline-flex;
  align-items: center;
  padding: 1px 8px;
  border-radius: 999px;
  background: #F0F0F0;
  color: #424242;
  font-size: 11.5px;
  line-height: 1.7;
  white-space: nowrap;
}
.chip.ok { background: #E7F5E6; color: var(--ok); }
.chip.brand { background: var(--brand-50); color: var(--brand-strong); }

/* 浮动工具条（示意图内） */
.mini {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  border: 1px solid rgba(0,0,0,.06);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow-16);
  font-family: var(--font);
  line-height: 1;
  text-indent: 0;
  white-space: nowrap;
}
.mini .mb-ai {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 30px;
  padding: 0 12px;
  border-radius: 5px;
  background: var(--brand);
  color: #fff;
  font-size: 12.5px;
  font-weight: 600;
  transition: background-color .15s, transform .15s;
}
.mini .mb-ai .i { width: 16px; height: 16px; }
.mini .mb {
  display: grid;
  place-items: center;
  width: 30px; height: 30px;
  border-radius: 5px;
  color: #424242;
  font-size: 13px;
  font-weight: 600;
}
.mini .mb .i { width: 16px; height: 16px; }
.mini .msep { width: 1px; height: 18px; margin: 0 3px; background: #E0E0E0; }
.mini .mkbd { padding: 0 8px 0 6px; color: #707070; font-size: 11px; }

/* 鼠标指针（示意图内） */
.cursor {
  position: absolute;
  width: 16px; height: 22px;
  fill: #fff;
  stroke: #1B1B1B;
  stroke-width: 1.2;
  stroke-linejoin: round;
  filter: drop-shadow(0 1px 1.5px rgba(0,0,0,.3));
  pointer-events: none;
}

/* 段落颜色条 */
.bar {
  position: absolute;
  left: -20px; top: 7px; bottom: 7px;
  width: 4px;
  border-radius: 2px;
  background: var(--c);
}

/* 环形仪表 */
.gauge { position: relative; }
.gauge svg { width: 100%; height: 100%; transform: rotate(-90deg); }
.gauge .g-track { fill: none; stroke: #EDEDED; }
.gauge .g-val { fill: none; stroke: var(--c, var(--score-4)); stroke-linecap: round; }
.gauge .g-text { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; line-height: 1.15; }
.gauge .g-text b { font-family: var(--font-display); font-weight: 600; color: #1B1B1B; font-variant-numeric: tabular-nums; }
.gauge .g-text span { color: #707070; }

/* 分数列表 */
.score-list li {
  display: grid;
  grid-template-columns: 4px 44px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 7px 8px;
  border-radius: 6px;
  font-size: 12.5px;
  line-height: 1.5;
}
.score-list li.is-hover { background: #F3F7FC; }
.score-list .sw-c { width: 4px; height: 22px; border-radius: 2px; background: var(--c); }
.score-list .nm { color: #424242; font-weight: 600; white-space: nowrap; }
.score-list .sn { color: #707070; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.score-list b { color: #242424; font-weight: 600; font-variant-numeric: tabular-nums; }

/* 分段控件 */
.seg { display: flex; gap: 2px; padding: 2px; border-radius: 6px; background: #F3F3F3; }
.seg i {
  flex: 1;
  padding: 4px 0;
  border-radius: 4px;
  color: #424242;
  font-size: 12.5px;
  font-style: normal;
  line-height: 1.5;
  text-align: center;
}
.seg i.on { background: #fff; color: var(--brand-strong); font-weight: 600; box-shadow: 0 1px 2px rgba(0,0,0,.14); }

.switch { position: relative; flex: none; width: 36px; height: 20px; border-radius: 10px; background: var(--brand); }
.switch::after { content: ""; position: absolute; right: 3px; top: 3px; width: 14px; height: 14px; border-radius: 50%; background: #fff; }

.cb {
  display: grid; place-items: center;
  flex: none;
  width: 16px; height: 16px;
  border-radius: 3px;
  background: var(--brand);
  color: #fff;
}
.cb .i { width: 12px; height: 12px; stroke-width: 2.4; }

/* ---------- 10a. 视觉 1：选区改写 ---------- */
.v1 .v-page { left: 36px; top: 36px; width: 528px; }
.v1 .mini { position: absolute; left: 22px; top: 66px; z-index: 2; }
.v1 .cursor { left: 74px; top: 88px; z-index: 3; }
.v1 .opts { right: 30px; bottom: 30px; width: 292px; }
.v1 .opt-row { display: grid; grid-template-columns: 40px 1fr; gap: 10px; align-items: center; margin-top: 10px; }
.v1 .opt-row > span { color: #616161; font-size: 12.5px; }
.v1 .opt-switch { display: flex; align-items: center; justify-content: space-between; margin-top: 12px; padding-top: 12px; border-top: 1px solid #F0F0F0; color: #424242; font-size: 12.5px; }
.v1 .expand { left: 36px; bottom: 30px; width: 226px; }
.v1 .expand p { margin-top: 6px; color: #5C5C5C; font-size: 12.5px; line-height: 1.7; }

/* ---------- 10b. 视觉 2：引用保护 ---------- */
.v2 .v-page { left: 32px; top: 32px; width: 300px; padding: 22px 24px; font-size: 14.5px; }
.v2 .v-p { text-align: left; }
.v2 .plist { right: 28px; top: 32px; width: 236px; padding: 14px 14px 12px; }
.v2 .plist ul { margin-top: 10px; }
.v2 .plist li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) 16px;
  gap: 8px;
  align-items: center;
  padding: 6px 4px;
  border-top: 1px solid #F3F3F3;
  font-size: 12.5px;
}
.v2 .plist .t { color: #707070; font-size: 11.5px; }
.v2 .plist .x { color: #242424; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-family: var(--font-doc); }
.v2 .plist .foot { display: flex; gap: 6px; margin-top: 10px; }
.v2 .note { right: 28px; bottom: 28px; width: 236px; padding: 10px 14px; font-size: 12.5px; color: #424242; }
.v2 .note .row { display: flex; align-items: center; gap: 10px; }
.v2 .note .row + .row { margin-top: 6px; }
.v2 .note .i { width: 14px; height: 14px; margin-inline: 4px; color: #8A6D00; }
.v2 .note .sw-p { flex: none; width: 22px; height: 14px; border-radius: 3px; background: var(--protect); box-shadow: inset 0 0 0 1px rgba(138,109,0,.15); }

/* ---------- 10c. 视觉 3：逐句审阅 ---------- */
.v3 .v-page { left: 32px; top: 32px; width: 536px; }
.v3 .review { right: 28px; bottom: 28px; width: 352px; }
.v3 .review .meta { display: flex; align-items: center; justify-content: space-between; color: #616161; font-size: 12px; }
.v3 .review .old, .v3 .review .new { margin-top: 8px; font-family: var(--font-doc); font-size: 13px; line-height: 1.75; }
.v3 .review .old { color: var(--bad); text-decoration: line-through; }
.v3 .review .new { color: var(--ok-text); }
.v3 .review .acts { position: relative; display: flex; gap: 6px; margin-top: 12px; }
.v3 .review .ab { padding: 0 9px; }
.v3 .warn { left: 32px; bottom: 28px; width: 180px; border-left: 3px solid var(--warn-line); }
.v3 .warn b { display: flex; align-items: center; gap: 6px; color: var(--warn-text); font-size: 12.5px; }
.v3 .warn b .i { width: 15px; height: 15px; }
.v3 .warn p { margin-top: 6px; color: #5C5C5C; font-size: 12px; line-height: 1.7; }
.v3 .acts .cursor { left: 36px; top: 15px; }

/* ---------- 10d. 视觉 4：AI 率检测 ---------- */
.v4 .v-page { left: 32px; top: 32px; width: 318px; padding: 22px 26px 22px 34px; font-size: 13.5px; line-height: 1.9; }
.v4 .v-p + .v-p { margin-top: 12px; }
.v4 .bar { left: -16px; }
.v4 .panel { right: 28px; top: 50px; width: 224px; padding: 14px; }
.v4 .gauge { width: 116px; height: 116px; margin: 8px auto 6px; }
.v4 .gauge .g-text b { font-size: 24px; }
.v4 .gauge .g-text span { font-size: 11px; margin-top: 2px; }
.v4 .score-list { margin-top: 6px; }
.v4 .score-list li { grid-template-columns: 4px 40px minmax(0,1fr) auto; gap: 8px; padding: 6px; }
.v4 .legend {
  right: 28px; top: 382px;
  width: 224px;
  display: flex; align-items: center; justify-content: center; gap: 10px;
  padding: 8px 12px;
  font-size: 12px;
  color: #5C5C5C;
}
.v4 .legend .ramp { width: 120px; height: 6px; border-radius: 3px; background: linear-gradient(90deg, var(--score-1), var(--score-2), var(--score-3), var(--score-4), var(--score-5)); }

/* ---------- 10e. 视觉 5：Word 导入导出 ---------- */
.v5 .file {
  width: 118px;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  text-align: center;
  font-size: 12.5px;
  line-height: 1.5;
}
.v5 .file .doc {
  position: relative;
  width: 72px; height: 90px;
  border-radius: 6px;
  background: #fff;
  box-shadow: 0 0 0 1px rgba(0,0,0,.06), 0 8px 20px rgba(0,0,0,.10);
}
.v5 .file .doc::before {
  content: "";
  position: absolute; right: 0; top: 0;
  width: 18px; height: 18px;
  border-bottom-left-radius: 5px;
  background: linear-gradient(225deg, var(--bg-soft) 50%, #E3E7EE 50%);
}
.v5 .file .doc i { position: absolute; left: 12px; height: 3px; border-radius: 2px; background: #E3E6EA; }
.v5 .file .doc .tag {
  position: absolute; left: 0; right: 0; bottom: 0;
  height: 22px;
  border-radius: 0 0 6px 6px;
  background: #185ABD;
  color: #fff;
  font-size: 11px; font-weight: 700; letter-spacing: .08em;
  line-height: 22px;
}
.v5 .file .fn { font-weight: 600; color: #242424; }
.v5 .file .fs { color: #707070; font-size: 11.5px; }
.v5 .file-in { left: 22px; top: 120px; }
.v5 .file-out { right: 22px; top: 120px; }
.v5 .arrow { top: 150px; width: 36px; height: 20px; color: var(--brand-300); }
.v5 .arrow-1 { left: 140px; }
.v5 .arrow-2 { right: 140px; }
.v5 .ed { left: 184px; top: 44px; width: 232px; padding: 0; overflow: hidden; }
.v5 .ed-bar { display: flex; align-items: center; gap: 6px; height: 28px; padding: 0 10px; background: #F0F4F9; font-size: 11px; color: #424242; }
.v5 .ed-bar img { width: 14px; height: 14px; }
.v5 .ed-body { padding: 12px 14px 14px; font-family: var(--font-doc); font-size: 11.5px; line-height: 1.7; color: #1F1F1F; }
.v5 .ed-body h5 { margin: 0; font-family: var(--font); font-size: 12.5px; font-weight: 700; }
.v5 .ed-body p { margin-top: 4px; }
.v5 .ed-body ul { margin-top: 4px; padding-left: 14px; list-style: disc; }
.v5 .ed-body a { color: var(--brand); text-decoration: underline; }
.v5 .ed-tbl { display: grid; grid-template-columns: 1.2fr 1fr 1fr; margin-top: 8px; border: 1px solid #D6D6D6; font-family: var(--font); font-size: 10.5px; }
.v5 .ed-tbl span { padding: 2px 6px; border-right: 1px solid #E3E3E3; border-bottom: 1px solid #E3E3E3; }
.v5 .ed-tbl span:nth-child(3n) { border-right: 0; }
.v5 .ed-tbl span:nth-last-child(-n+3) { border-bottom: 0; }
.v5 .ed-tbl .th { background: #F3F6FA; font-weight: 600; }
.v5 .ed-img { display: flex; align-items: center; justify-content: center; height: 52px; margin-top: 8px; border-radius: 4px; background: linear-gradient(135deg, #DCEBFA, #E3F4F2); color: #5B8DB8; }
.v5 .ed-img .i { width: 22px; height: 22px; }
.v5 .formats { left: 22px; right: 22px; bottom: 28px; display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.v5 .formats span {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px;
  border-radius: 999px;
  background: #fff;
  box-shadow: var(--shadow-2);
  color: #424242;
  font-size: 12.5px;
  line-height: 1.5;
}
.v5 .formats .i { width: 14px; height: 14px; color: var(--brand); }

/* ---------- 11. 首屏界面演示（1280×800 虚拟画布） ---------- */
.app {
  position: relative;
  display: flex;
  flex-direction: column;
  width: 1280px;
  height: 800px;
  overflow: hidden;
  background: #EEF2F7;
  color: #242424;
  font-family: var(--font);
  font-size: 13px;
  line-height: 1.5;
  cursor: default;
  -webkit-user-select: none;
  user-select: none;
}

.a-title { flex: none; display: flex; align-items: center; justify-content: space-between; height: 40px; padding-left: 14px; }
.a-title-l, .a-title-r { display: flex; align-items: center; width: 400px; height: 100%; }
.a-title-l { gap: 10px; }
.a-title-r { justify-content: flex-end; }
.a-icon { width: 18px; height: 18px; }
.a-fname { color: #1B1B1B; font-size: 13px; }
.a-saved { padding-left: 10px; border-left: 1px solid #D6D6D6; color: #707070; font-size: 12px; }
.a-search {
  display: flex; align-items: center; gap: 8px;
  width: 340px; height: 28px;
  padding: 0 10px;
  border: 1px solid #E1E4E8;
  border-radius: 6px;
  background: rgba(255,255,255,.8);
  color: #8A8A8A;
  font-size: 12.5px;
}
.a-search .i { width: 15px; height: 15px; }
.a-avatar {
  display: grid; place-items: center;
  width: 26px; height: 26px;
  margin-right: 10px;
  border-radius: 50%;
  background: #C7DDF4;
  color: var(--brand-strong);
  font-size: 12px;
  font-weight: 600;
}
.a-cap { display: grid; place-items: center; width: 46px; height: 100%; }
.a-cap svg { width: 10px; height: 10px; fill: none; stroke: #1B1B1B; stroke-width: 1; }

.a-tabs { flex: none; display: flex; align-items: flex-end; gap: 2px; height: 34px; padding: 0 10px; }
.a-tabs span { position: relative; height: 30px; padding: 0 12px; color: #424242; font-size: 13px; line-height: 30px; }
.a-tabs .on { color: var(--brand); font-weight: 600; }
.a-tabs .on::after { content: ""; position: absolute; left: 12px; right: 12px; bottom: 2px; height: 3px; border-radius: 2px; background: var(--brand); }

.a-ribbon {
  flex: none;
  display: flex;
  height: 100px;
  margin: 0 8px 8px;
  padding: 8px 4px 0;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 0 2px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.08);
}
.rg { display: flex; flex-direction: column; padding: 0 8px; border-right: 1px solid #EBEBEB; }
.rg-items { flex: 1; display: flex; gap: 4px; }
.rg-label { height: 22px; color: #707070; font-size: 11.5px; line-height: 22px; text-align: center; }
.rb-lg {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
  min-width: 64px;
  padding: 0 8px;
  border-radius: 4px;
  font-size: 12px;
  white-space: nowrap;
}
.rb-lg .i { width: 30px; height: 30px; stroke-width: 1.2; color: #424242; }
.rb-lg.is-brand .i { color: var(--brand); }
.rb-lg.is-hot { background: #F0F6FC; }
.rb-col { display: flex; flex-direction: column; justify-content: center; gap: 1px; }
.rb { display: flex; align-items: center; gap: 6px; height: 23px; padding: 0 8px; border-radius: 4px; font-size: 12px; white-space: nowrap; }
.rb .i { width: 16px; height: 16px; color: #424242; }
.rg-quota { margin-left: auto; border-right: 0; justify-content: center; padding-right: 14px; }
.quota { width: 170px; }
.quota-top { display: flex; justify-content: space-between; color: #616161; font-size: 11.5px; }
.quota-top b { color: #242424; font-weight: 600; }
.quota-bar { height: 4px; margin-top: 6px; border-radius: 2px; background: #EDEDED; overflow: hidden; }
.quota-bar i { display: block; width: 72%; height: 100%; border-radius: 2px; background: var(--brand); }
.quota-sub { margin-top: 6px; color: #8A8A8A; font-size: 11px; }

.a-body { flex: 1; min-height: 0; display: flex; gap: 8px; padding: 0 8px; }
.a-canvas { position: relative; flex: 1; min-width: 0; overflow: hidden; padding-top: 22px; border-radius: 8px 8px 0 0; background: #E3E7ED; }
.a-page {
  position: relative;
  width: 680px;
  min-height: 900px;
  margin: 0 auto;
  padding: 50px 76px;
  background: #fff;
  box-shadow: 0 0 0 1px rgba(0,0,0,.03), 0 2px 8px rgba(0,0,0,.08);
  color: #1F1F1F;
  font-family: var(--font-doc);
  font-size: 14.5px;
  line-height: 1.95;
  transition: opacity .45s var(--ease);
}
.d-title { font-family: var(--font); font-size: 21px; font-weight: 700; line-height: 1.4; text-align: center; color: #111; }
.d-sub { margin-top: 4px; color: #616161; font-family: var(--font); font-size: 13px; text-align: center; }
.d-h { margin: 22px 0 6px; font-family: var(--font); font-size: 15px; font-weight: 700; }
.d-p { position: relative; margin-bottom: 8px; text-align: justify; text-indent: 2em; }

.app .bar { left: -26px; transform: scaleY(0); transform-origin: 50% 0; transition: transform .7s var(--ease-out) var(--d, 0ms), background-color .9s var(--ease); }
.app.s1 .bar { transform: scaleY(1); }
.app.s7 .d-p[data-p="1"] { --c: var(--score-2); }

.t-target {
  background-image: linear-gradient(var(--select), var(--select));
  background-repeat: no-repeat;
  background-size: 0% 100%;
  transition: background-size 1s var(--ease), color .3s var(--ease);
}
.app.s2 .t-target { background-size: 100% 100%; }
.app.s4:not(.s5) .t-target { animation: busy 1.1s ease-in-out infinite; }
.app.s5 .t-target { background-image: none; color: var(--bad); text-decoration: line-through; text-decoration-color: rgba(209,52,56,.85); }
.app.s7 .t-target { display: none; }

.t-new {
  display: none;
  color: var(--ok-text);
  text-decoration: underline;
  text-decoration-color: var(--ok-line);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 4px;
  transition: color .6s var(--ease), text-decoration-color .6s var(--ease);
}
.app.s5 .t-new { display: inline; animation: fadeIn .6s var(--ease-out); }
.app.s7 .t-new { color: inherit; text-decoration-color: transparent; }

.app .mini { position: absolute; left: 20px; top: -50px; z-index: 3; opacity: 0; transform: translateY(6px); transition: opacity .25s var(--ease), transform .35s var(--ease-out); }
.app.s3 .mini { opacity: 1; transform: none; }
.app.s4 .mini { opacity: 0; transform: translateY(4px); transition-delay: .45s; }
.app.s4 .mb-ai { background: var(--brand-pressed); transform: scale(.95); }

.app .cursor { opacity: 0; transition: opacity .25s var(--ease), transform .8s var(--ease-out); }
.app .cur-1 { left: 66px; top: 18px; transform: translate(60px, 46px); }
.app.s3 .cur-1 { opacity: 1; transform: none; transition-delay: .2s; }
.app.s4 .cur-1 { transform: scale(.88); transition-duration: .15s; transition-delay: 0s; }

.a-toast {
  position: absolute;
  left: 50%; bottom: 24px;
  display: flex; align-items: center; gap: 10px;
  padding: 8px 14px;
  border-radius: 6px;
  background: #2B2B2B;
  box-shadow: var(--shadow-16);
  color: #fff;
  font-size: 12.5px;
  white-space: nowrap;
  opacity: 0;
  transform: translate(-50%, 8px);
  transition: opacity .25s var(--ease), transform .35s var(--ease-out);
}
.a-toast kbd { height: 20px; min-width: 20px; border-color: #555; background: #3A3A3A; color: #fff; font-size: 11px; }
.a-toast .spin { width: 14px; height: 14px; border: 2px solid rgba(255,255,255,.3); border-top-color: #fff; border-radius: 50%; animation: spin .8s linear infinite; }
.app.s1:not(.s2) .a-toast { opacity: 1; transform: translate(-50%, 0); }

.a-pane { flex: none; display: flex; flex-direction: column; width: 340px; overflow: hidden; border-radius: 8px 8px 0 0; background: #fff; box-shadow: 0 0 2px rgba(0,0,0,.08), 0 1px 2px rgba(0,0,0,.08); }
.a-ptabs { flex: none; display: flex; gap: 2px; padding: 4px 10px 0; border-bottom: 1px solid #EDEDED; }
.a-ptabs span { position: relative; padding: 9px 10px; color: #616161; font-size: 13px; transition: color .3s; }
.a-ptabs span::after { content: ""; position: absolute; left: 10px; right: 10px; bottom: -1px; height: 3px; border-radius: 2px; background: var(--brand); opacity: 0; transition: opacity .3s; }
.a-ptabs .pt-detect { color: #1B1B1B; }
.a-ptabs .pt-detect::after { opacity: 1; }
.app.s4 .pt-detect { color: #616161; }
.app.s4 .pt-detect::after { opacity: 0; }
.app.s4 .pt-review { color: #1B1B1B; }
.app.s4 .pt-review::after { opacity: 1; }

.a-pbody { position: relative; flex: 1; transition: opacity .45s var(--ease); }
.view { position: absolute; inset: 0; padding: 16px 18px; transition: opacity .35s var(--ease), transform .4s var(--ease-out); }
.view-review { opacity: 0; transform: translateX(14px); }
.app.s4 .view-detect { opacity: 0; transform: translateX(-14px); }
.app.s4 .view-review { opacity: 1; transform: none; }

.view-detect .gauge { width: 150px; height: 150px; margin: 6px auto 0; }
.view-detect .g-track, .view-detect .g-val { stroke-width: 11; }
.view-detect .g-val { stroke-dasharray: 314.16; stroke-dashoffset: 314.16; transition: stroke-dashoffset 1.3s var(--ease-out) .25s; }
.app.s1 .view-detect .g-val { stroke-dashoffset: 169.65; }
.view-detect .g-text b { font-size: 30px; opacity: 0; transition: opacity .4s var(--ease) .6s; }
.view-detect .g-text span { font-size: 12px; margin-top: 2px; }
.app.s1 .view-detect .g-text b { opacity: 1; }
.d-empty { margin-top: 18px; color: #707070; font-size: 12.5px; text-align: center; transition: opacity .3s; }
.app.s1 .d-empty { opacity: 0; }
.d-list-head { display: flex; justify-content: space-between; margin-top: -20px; padding-bottom: 6px; border-bottom: 1px solid #F0F0F0; color: #707070; font-size: 12px; opacity: 0; transition: opacity .3s .3s; }
.app.s1 .d-list-head { opacity: 1; }
.view-detect .score-list { margin-top: 6px; }
.view-detect .score-list li { opacity: 0; transform: translateY(4px); transition: opacity .4s var(--ease), transform .4s var(--ease-out), background-color .3s; transition-delay: calc(var(--i) * 90ms + 500ms); }
.app.s1 .view-detect .score-list li { opacity: 1; transform: none; }
.app.s2 .view-detect .score-list li:first-child { background: #F0F6FC; }

.rv-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 12px; }
.rv-head b { font-size: 14px; font-weight: 600; }
.rv-head .lnk { color: var(--brand); font-size: 12px; }
.rv-card { position: relative; padding: 14px; border: 1px solid #E6E6E6; border-radius: 8px; box-shadow: 0 1px 2px rgba(0,0,0,.05); transition: border-color .4s var(--ease), background-color .4s var(--ease); }
.rv-meta { display: flex; align-items: center; justify-content: space-between; color: #616161; font-size: 12px; }
.rv-busy { margin-top: 12px; color: #424242; font-size: 12.5px; }
.rv-busy .row { display: flex; justify-content: space-between; }
.rv-busy .lnk { color: var(--brand); font-size: 12px; }
.progress { position: relative; height: 3px; margin-top: 10px; overflow: hidden; border-radius: 2px; background: var(--brand-50); }
.progress i { position: absolute; top: 0; bottom: 0; left: -40%; width: 40%; border-radius: 2px; background: var(--brand); animation: indet 1.4s var(--ease) infinite; }
.rv-result { display: none; }
.app.s5 .rv-busy { display: none; }
.app.s5 .rv-result { display: block; animation: fadeIn .45s var(--ease-out); }
.rv-old, .rv-new { font-family: var(--font-doc); font-size: 13px; line-height: 1.75; }
.rv-old { margin-top: 10px; color: var(--bad); text-decoration: line-through; text-decoration-color: rgba(209,52,56,.7); }
.rv-new { margin-top: 6px; color: var(--ok-text); }
.rv-score { display: flex; align-items: center; justify-content: space-between; margin-top: 10px; padding: 7px 10px; border-radius: 6px; background: var(--ok-bg); color: #424242; font-size: 12px; }
.rv-score b { color: var(--ok); font-weight: 600; }
.rv-actions { position: relative; display: flex; gap: 6px; margin-top: 12px; }
.app.s6 .rv-actions .ab-primary { background: var(--brand-pressed); transform: scale(.95); }
.app.s7 .rv-actions { display: none; }
.rv-done { display: none; align-items: center; gap: 6px; margin-top: 12px; color: var(--ok); font-size: 12.5px; font-weight: 600; }
.rv-done .i { width: 16px; height: 16px; stroke-width: 2; }
.app.s7 .rv-done { display: flex; animation: fadeIn .4s var(--ease-out); }
.app.s7 .rv-card { border-color: #BFE3BD; background: #FBFEFB; }
.app .cur-2 { left: 34px; top: 14px; transform: translate(70px, 40px); }
.app.s5 .cur-2 { opacity: 1; transform: none; transition-delay: 1.4s; }
.app.s6 .cur-2 { transform: scale(.88); transition-duration: .15s; transition-delay: 0s; }
.rv-tip { margin-top: 14px; padding: 10px 12px; border-radius: 6px; background: #F7F7F7; color: #616161; font-size: 12px; line-height: 1.65; }
.rv-tip b { color: #424242; font-weight: 600; }

.a-status { flex: none; display: flex; align-items: center; justify-content: space-between; height: 28px; padding: 0 16px; color: #5C5C5C; font-size: 12px; }
.a-status .l, .a-status .r { display: flex; align-items: center; gap: 20px; }
.zoom { display: flex; align-items: center; gap: 8px; }
.zoom .zl { position: relative; display: block; width: 100px; height: 2px; border-radius: 1px; background: #A0A0A0; }
.zoom .zl::after { content: ""; position: absolute; left: 50%; top: -5px; width: 4px; height: 12px; border-radius: 2px; background: #424242; transform: translateX(-50%); }

.app.is-fading .a-page, .app.is-fading .a-pbody { opacity: 0; }
.app.no-tr *, .app.no-tr *::before, .app.no-tr *::after { transition: none !important; animation: none !important; }

@keyframes busy { 0%, 100% { opacity: 1; } 50% { opacity: .42; } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes fadeUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
@keyframes indet { from { left: -40%; } to { left: 100%; } }
@keyframes spin { to { transform: rotate(360deg); } }


/* ---------- 12. 功能一览（Pivot） ---------- */
.pivot { display: flex; justify-content: center; gap: 4px; overflow-x: auto; border-bottom: 1px solid var(--line); scrollbar-width: none; }
.pivot::-webkit-scrollbar { display: none; }
.pivot [role="tab"] {
  position: relative; flex: none;
  padding: 12px 14px 14px;
  border: 0; background: none;
  color: var(--ink-2); font-size: 16px; line-height: 1.4;
  transition: color var(--dur) var(--ease);
}
.pivot [role="tab"]::before { content: attr(data-label); display: block; height: 0; overflow: hidden; visibility: hidden; font-weight: 600; }
.pivot [role="tab"]:hover { color: var(--ink); }
.pivot [role="tab"][aria-selected="true"] { color: var(--ink); font-weight: 600; }
.pivot [role="tab"][aria-selected="true"]::after { content: ""; position: absolute; left: 14px; right: 14px; bottom: -1px; height: 2px; background: var(--ink); }
.pivot [role="tab"]:focus-visible { outline-offset: -2px; }
.tab-panel { padding-top: 32px; }
.tab-panel:focus-visible { outline: none; }
.js .tab-panel:not(.is-active) { display: none; }
.js .tab-panel.is-active { animation: fadeIn .3s var(--ease); }

.spec-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.spec { padding: 28px; border-radius: var(--r-card); background: #fff; }
.spec > .i { width: 24px; height: 24px; color: var(--ink); stroke-width: 1.4; }
.spec h3 { margin-top: 16px; font-size: 18px; font-weight: 600; line-height: 1.5; }
.spec dl { display: grid; gap: 12px; margin-top: 12px; }
.spec dt { color: var(--ink-3); font-size: 13px; font-weight: 600; }
.spec dd { margin-top: 2px; color: var(--ink-2); font-size: 15px; line-height: 1.75; }
.spec kbd { height: 20px; min-width: 20px; font-size: 11px; }

/* ---------- 13. 使用流程 ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px 40px; counter-reset: step; }
.step { padding-top: 24px; border-top: 1px solid var(--line); }
.step-num { display: grid; place-items: center; width: 36px; height: 36px; border: 1.5px solid var(--ink); border-radius: 50%; font-size: 15px; font-weight: 600; line-height: 1; }
.step h3 { margin-top: 18px; font-size: 19px; font-weight: 600; line-height: 1.5; }
.step p { margin-top: 8px; color: var(--ink-2); font-size: 15.5px; line-height: 1.75; }
.step kbd { height: 20px; min-width: 20px; font-size: 11px; }

/* ---------- 14. 比较表 ---------- */
.compare-wrap { max-width: 1040px; margin: 0 auto; }
.compare { width: 100%; border-collapse: collapse; }
.compare th, .compare td { padding: 18px 20px; border-bottom: 1px solid var(--line); font-size: 15.5px; line-height: 1.7; text-align: left; vertical-align: top; }
.compare thead th { padding-top: 0; border-bottom: 2px solid var(--ink); color: var(--ink); font-size: 16px; font-weight: 600; vertical-align: middle; }
.compare thead th.ours .brand-cell { display: inline-flex; align-items: center; gap: 10px; }
.compare thead th.ours img { width: 32px; height: 32px; }
.compare tbody th { width: 18%; color: var(--ink); font-weight: 600; white-space: nowrap; }
.compare td.theirs { width: 38%; color: var(--ink-2); }
.compare td.ours { color: var(--ink); }
.compare td.ours .cell { display: flex; gap: 10px; align-items: flex-start; }
.compare td.ours .i { width: 18px; height: 18px; margin-top: 4px; stroke-width: 2; }
.compare-note { margin-top: 20px; color: var(--ink-3); font-size: 13px; }

/* ---------- 15. 隐私与数据 ---------- */
.privacy-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: clamp(40px, 6vw, 88px); align-items: center; }
.privacy-grid .section-head { margin-bottom: 32px; }
.pv-list li { display: grid; grid-template-columns: 28px 1fr; gap: 16px; padding: 22px 0; border-top: 1px solid var(--line); }
.pv-list li:last-child { border-bottom: 1px solid var(--line); }
.pv-list .i { width: 24px; height: 24px; margin-top: 2px; stroke-width: 1.4; }
.pv-list h3 { font-size: 17px; font-weight: 600; line-height: 1.5; }
.pv-list p { margin-top: 4px; color: var(--ink-2); font-size: 15.5px; line-height: 1.75; }

.pd { position: relative; width: 100%; height: 100%; color: var(--ink); font-family: var(--font); }
.pd > * { position: absolute; }
.pd-card { border-radius: 10px; background: #fff; box-shadow: 0 0 0 1px rgba(0,0,0,.06), 0 8px 24px rgba(0,0,0,.08); }
.pd-head { display: flex; align-items: center; gap: 8px; height: 40px; padding: 0 14px; border-bottom: 1px solid #EDEDED; color: #424242; font-size: 12.5px; }
.pd-head .i { width: 16px; height: 16px; }
.pd-head .muted { margin-left: auto; color: #8A8A8A; font-size: 11.5px; }
.pd-local { left: 28px; top: 30px; width: 250px; height: 292px; }
.pd-lines { padding: 16px 16px 0; }
.pd-line { display: flex; gap: 6px; height: 10px; margin-bottom: 13px; }
.pd-line i { display: block; height: 100%; border-radius: 3px; background: #E6E6E6; }
.pd-line i.sel { background: var(--accent); box-shadow: 0 0 0 3px rgba(0,103,184,.14); }
.pd-line i.pro { background: #F2C94C; }
.pd-remote { right: 28px; top: 88px; width: 176px; height: 192px; }
.pd-remote .pd-lines { padding-top: 18px; }
.pd-remote .rcv { padding: 0 16px; color: #616161; font-size: 11.5px; line-height: 1.6; }
.pd-flow { left: 0; top: 0; width: 100%; height: 100%; overflow: visible; pointer-events: none; }
.pd-flow path { fill: none; stroke: var(--accent); stroke-width: 1.6; stroke-dasharray: 5 5; animation: dash 1.6s linear infinite; }
.pd-flow .dot { fill: var(--accent); }
.pd-label { left: 290px; top: 46px; padding: 4px 10px; border: 1px solid var(--line); border-radius: 4px; background: #fff; color: var(--ink); font-size: 12px; line-height: 1.5; white-space: nowrap; }
.pd-legend { left: 28px; right: 28px; bottom: 22px; display: flex; flex-wrap: wrap; gap: 6px 18px; color: #4A4A4A; font-size: 12px; }
.pd-legend span { display: inline-flex; align-items: center; gap: 8px; }
.pd-legend i { width: 14px; height: 8px; border-radius: 2px; }
@keyframes dash { to { stroke-dashoffset: -20; } }

/* ---------- 16. 常见问题 ---------- */
.faq-wrap { max-width: 880px; margin: 0 auto; }
.faq-wrap .section-head { margin-bottom: 32px; }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 22px 0; font-size: 18px; font-weight: 600; line-height: 1.55; list-style: none; cursor: pointer; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary:hover { text-decoration: underline; text-underline-offset: 4px; }
.faq-list summary .i { color: var(--ink); transition: transform .2s var(--ease); }
.faq-list details[open] summary .i { transform: rotate(180deg); }
.faq-list .answer { padding: 0 48px 24px 0; color: var(--ink-2); font-size: 16px; line-height: 1.8; }
.faq-list .answer p + p { margin-top: 10px; }
.faq-list .answer kbd { height: 20px; min-width: 20px; font-size: 11px; }

/* ---------- 17. 预约内测 ---------- */
.cta-inner { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 520px); gap: clamp(40px, 6vw, 96px); align-items: center; }
.cta-copy > p { margin-top: 16px; color: var(--ink-2); font-size: 18px; line-height: 1.75; }
.cta-copy .bullets { margin-top: 24px; }
.form { padding: 32px; border-radius: var(--r-card); background: var(--surface-2); }
.field + .field { margin-top: 22px; }
.field > label, .field > legend { display: block; margin-bottom: 8px; font-size: 14px; font-weight: 600; }
.field .opt { color: var(--ink-3); font-weight: 400; }
.input-row { display: flex; gap: 8px; }
.input {
  flex: 1; min-width: 0; height: 44px; padding: 0 12px;
  border: 1px solid var(--line); border-bottom-color: #8A8A8A; border-radius: var(--r-control);
  background: #fff; font-size: 15px;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.input::placeholder { color: #8A8A8A; }
.input:hover { border-color: #B3B3B3; border-bottom-color: #616161; }
.input:focus { outline: none; border-bottom-color: var(--accent); box-shadow: inset 0 -1px 0 var(--accent); }
.input[aria-invalid="true"] { border-bottom-color: var(--bad); box-shadow: inset 0 -1px 0 var(--bad); }
.input-row .btn { min-height: 44px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip-opt { position: relative; }
.chip-opt input { position: absolute; inset: 0; margin: 0; opacity: 0; cursor: pointer; }
.chip-opt span { display: inline-flex; align-items: center; height: 40px; padding: 0 16px; border: 1px solid var(--line); border-radius: var(--r-control); background: #fff; color: var(--ink); font-size: 14px; transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease); }
.chip-opt input:hover + span { border-color: #8A8A8A; }
.chip-opt input:checked + span { border-color: var(--accent); background: var(--accent-tint); color: var(--accent-pressed); font-weight: 600; }
.chip-opt input:focus-visible + span { outline: 2px solid var(--ink); outline-offset: 2px; }
.hp { position: absolute !important; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form .spinner { display: none; width: 16px; height: 16px; border: 2px solid rgba(255,255,255,.45); border-top-color: #fff; border-radius: 50%; animation: spin .8s linear infinite; }
.form.is-loading .spinner { display: inline-block; }
.form-msg { margin-top: 12px; font-size: 14px; }
.form-msg:empty { display: none; }
.form-msg[data-type="error"] { color: var(--bad); }
.form-note { margin-top: 16px; color: var(--ink-3); font-size: 13px; line-height: 1.7; }
.form-done { display: none; padding: 16px 0; }
.form-done .i { width: 32px; height: 32px; color: var(--ok); stroke-width: 2; }
.form-done h3 { margin-top: 12px; font-size: 20px; font-weight: 600; }
.form-done p { margin-top: 6px; color: var(--ink-2); word-break: break-all; }
.form.is-done .form-body { display: none; }
.form.is-done .form-done { display: block; animation: fadeIn .3s var(--ease); }
.form-done:focus { outline: none; }

/* ---------- 18. 页脚 ---------- */
.footer { padding: 56px 0 32px; background: var(--surface-2); color: var(--ink-3); font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; }
.footer-tag { max-width: 360px; margin-top: 16px; line-height: 1.75; }
.footer h4 { margin-bottom: 14px; color: var(--ink); font-size: 14px; font-weight: 600; }
.footer ul { display: grid; gap: 10px; }
.footer a { color: var(--ink-3); }
.footer a:hover { color: var(--ink); }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 32px; margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--line); font-size: 13px; line-height: 1.8; }
.footer-legal { max-width: 780px; }

/* ---------- 19. 响应式 ---------- */
@media (min-width: 800px) { .br-md { display: inline; } }

@media (max-width: 1200px) {
  .brand-sep, .brand-full { display: none; }
}

@media (max-width: 960px) {
  .nav-toggle { display: inline-flex; }
  .nav-links {
    position: fixed; left: 0; right: 0; top: var(--nav-h);
    display: none; flex-direction: column; gap: 0; height: auto;
    padding: 8px var(--gutter) 16px;
    background: #fff; border-bottom: 1px solid var(--line-2);
    box-shadow: 0 16px 32px rgba(0,0,0,.08);
  }
  .nav.is-open .nav-links { display: flex; animation: fadeIn .2s var(--ease); }
  .nav-links a { padding: 14px 0; border-bottom: 1px solid var(--line-2); font-size: 16px; }
  .nav-links a:last-child { border-bottom: 0; }
  .nav-links a.is-active::after { display: none; }

  .hero-top { grid-template-columns: 1fr; }
  .hero-logo { display: none; }
  .feature, .feature.is-reverse, .privacy-grid, .cta-inner { grid-template-columns: 1fr; }
  .feature.is-reverse .feature-copy { order: 0; }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 720px) {
  .compare, .compare tbody, .compare tr, .compare th, .compare td { display: block; width: 100% !important; }
  .compare thead { display: none; }
  .compare tr { padding: 16px 0; border-bottom: 1px solid var(--line); }
  .compare tr:first-child { border-top: 2px solid var(--ink); }
  .compare tbody th, .compare td { padding: 4px 0; border: 0; }
  .compare tbody th { font-size: 17px; }
  .compare td { margin-top: 8px; }
  .compare td::before { content: attr(data-label); display: block; color: var(--ink-3); font-size: 13px; font-weight: 600; }
}

@media (max-width: 600px) {
  .hero-actions .btn { width: 100%; }
  .hero-meta span { display: block; }
  .hero-meta span + span::before { display: none; }
  .steps { grid-template-columns: 1fr; gap: 32px; }
  .spec-grid { grid-template-columns: 1fr; }
  .spec { padding: 24px; }
  .pivot { justify-content: flex-start; }
  .input-row { flex-direction: column; }
  .form { padding: 24px 20px; }
  .faq-list summary { font-size: 16.5px; padding: 18px 0; }
  .faq-list .answer { padding-right: 0; font-size: 15.5px; }
  .footer-grid { gap: 32px 20px; }
}

/* ---------- 20. 减少动态效果 / 打印 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; transition-delay: 0s !important; }
  .js .reveal { opacity: 1; transform: none; }
}
@media print {
  .nav, .hero-media, .cta, .feature-media, .pv-visual { display: none !important; }
}