/*!
 * OSGKeyboard 主页设计系统（2026-10 动效版）
 * 方向：Apple 式产品页 —— 深色产品舞台 + 实机画面优先 + 滚动叙事。
 * 动效母题：「声音变成文字」—— 声波、涟漪、逐字浮现、流式转写。
 * 主题跟随系统（site.js 可手动覆盖）；Hero / 隐私 / 下载区块在两种
 * 主题下都使用固定的深色「舞台」调色板，与新应用图标同一语言。
 *
 * 渐进增强约定：所有「先隐藏、再显现」的初始态都挂在 html.js 之下；
 * 无 JavaScript 或开启「减弱动态效果」时，页面以完整静态形态呈现。
 */

/* --------------------------------------------------------------------------
 * 1. 设计令牌
 * -------------------------------------------------------------------------- */
:root {
  color-scheme: light dark;
  --canvas: #f3f5f7;
  --surface: #ffffff;
  --surface-soft: #eceff3;
  --surface-strong: #e4e9ee;
  --ink: #0f1214;
  --ink-2: #55606a;
  --ink-3: #8a939c;
  --line: rgba(15, 18, 20, 0.09);
  --line-strong: rgba(15, 18, 20, 0.16);
  --accent: #2c8a52;
  --accent-strong: #217142;
  --accent-soft: rgba(44, 138, 82, 0.12);
  /* 深色舞台：Hero / 隐私 / 下载共用，两种主题下保持一致 */
  --stage-1: #272d35;
  --stage-2: #14171c;
  --stage-3: #0c0e12;
  --stage-ink: #f4f6f7;
  --stage-ink-2: #a7b0b9;
  --stage-line: rgba(255, 255, 255, 0.1);
  --stage-accent: #6fc491;
  --content: min(1120px, calc(100vw - 48px));
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 14px;
  --shadow-card: 0 28px 56px -28px rgba(16, 20, 24, 0.25);
  --shadow-media: 0 32px 64px -32px rgba(16, 20, 24, 0.35);

  /* 动效令牌：统一的缓动曲线与时长，所有组件只引用这里 */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  /* 物理弹簧（linear() 采样），用于需要「落定感」的元素：气泡、芯片、胶囊 */
  --ease-spring: linear(
    0, 0.009, 0.035 2.1%, 0.141, 0.281 6.7%, 0.723 12.9%, 0.938 16.7%, 1.017,
    1.077, 1.121, 1.149 24.3%, 1.159, 1.163, 1.161, 1.154 29.9%, 1.129 32.8%,
    1.051 39.6%, 1.017 43.1%, 0.991, 0.977 51%, 0.974 53.8%, 0.975 57.1%,
    0.997 69.8%, 1.003 76.9%, 1.004 83.8%, 1
  );
  --dur-fast: 0.22s;
  --dur-base: 0.5s;
  --dur-slow: 0.95s;

  /* 嵌入式手机演示的配色（随主题切换） */

  /* 键盘复刻色：取自 App 源码 ColorLibrary（brandAccent / aiTeal / recordRed）与原生键面色 */
  --kb-accent: #3aa05a;
  --kb-teal: #2bafa4;
  --kb-red: #ff3b30;
}

html[data-theme="dark"] {
  --canvas: #0e1013;
  --surface: #16191d;
  --surface-soft: #12151a;
  --surface-strong: #20252b;
  --ink: #f2f4f5;
  --ink-2: #a4adb5;
  --ink-3: #7c858d;
  --line: rgba(255, 255, 255, 0.09);
  --line-strong: rgba(255, 255, 255, 0.16);
  --accent: #68bf8d;
  --accent-strong: #7dcd9e;
  --accent-soft: rgba(104, 191, 141, 0.14);
  --shadow-card: 0 28px 56px -28px rgba(0, 0, 0, 0.6);
  --shadow-media: 0 32px 64px -32px rgba(0, 0, 0, 0.65);

}

/* --------------------------------------------------------------------------
 * 2. 基础排版
 * -------------------------------------------------------------------------- */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  background: var(--canvas);
}

body {
  margin: 0;
  /* clip 不会生成滚动容器，滚动叙事的 position: sticky 才能正常工作 */
  overflow-x: hidden;
  overflow-x: clip;
  background: var(--canvas);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

html[data-lang="en"] body {
  font-family: "Outfit", -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Helvetica Neue", Arial, sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
  font: inherit;
}

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

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  text-wrap: balance;
}

html[data-lang="zh"] h1,
html[data-lang="zh"] h2,
html[data-lang="zh"] h3 {
  overflow-wrap: normal;
  word-break: keep-all;
}

::selection {
  background: var(--accent);
  color: #fff;
}

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

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 9px 14px;
  border-radius: 999px;
  background: var(--ink);
  color: var(--canvas);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

/* 仅供读屏：逐字拆分的标题由它提供完整句子 */
.sr-only {
  position: absolute;
  overflow: hidden;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* 内联 SVG 图标库容器：不可见但可被 <use> 引用 */
.svg-defs {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

/* 内联 SVG 图标系统：currentColor 描边，随主题变色 */
.i {
  width: 1.25em;
  height: 1.25em;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
  vertical-align: -0.28em;
}

/* 页面滚动进度条：由 site.js 直接写 transform，避免每帧触发全局样式重算 */
.scroll-progress {
  position: fixed;
  z-index: 60;
  top: 0;
  right: 0;
  left: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--stage-accent), #b5ecc9 60%, var(--stage-accent));
  box-shadow: 0 0 12px rgba(111, 196, 145, 0.6);
  pointer-events: none;
  transform: scaleX(0);
  transform-origin: 0 50%;
}

/* --------------------------------------------------------------------------
 * 3. 导航
 * -------------------------------------------------------------------------- */
/* Hero 是深色舞台：导航在页面顶部时按深色舞台配色，滚动后切换为主题色 */
.site-nav {
  position: fixed;
  z-index: 50;
  top: 0;
  right: 0;
  left: 0;
  border-bottom: 1px solid transparent;
  color: var(--stage-ink);
  transition: background 0.35s ease, border-color 0.35s ease, color 0.35s ease;
}

.site-nav.is-scrolled {
  border-bottom-color: var(--line);
  background: color-mix(in srgb, var(--canvas) 78%, transparent);
  color: var(--ink);
  -webkit-backdrop-filter: blur(20px) saturate(1.6);
  backdrop-filter: blur(20px) saturate(1.6);
}

.nav-shell {
  display: flex;
  width: var(--content);
  height: 64px;
  align-items: center;
  justify-content: space-between;
  margin: 0 auto;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.98rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.brand img {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  transition: transform var(--dur-base) var(--ease-spring);
}

.brand:hover img {
  transform: rotate(-8deg) scale(1.06);
}

.nav-links {
  position: relative;
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  position: relative;
  z-index: 1;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.92rem;
  opacity: 0.72;
  transition: opacity 0.2s ease;
}

.nav-links a:hover,
.nav-links a.is-active {
  opacity: 1;
}

/* 导航滑块：位置与宽度由 site.js 写入，弹簧曲线让它「跟手」 */
.nav-indicator {
  position: absolute;
  top: 50%;
  left: 0;
  width: var(--iw, 0px);
  height: 34px;
  border-radius: 999px;
  background: color-mix(in srgb, currentColor 11%, transparent);
  opacity: 0;
  pointer-events: none;
  transform: translate3d(var(--ix, 0px), -50%, 0);
  transition: transform 0.55s var(--ease-spring), width 0.55s var(--ease-spring),
    opacity 0.3s ease;
}

.nav-links.has-indicator .nav-indicator {
  opacity: 1;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.icon-button,
.language-button {
  display: inline-grid;
  min-width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  opacity: 0.78;
  transition: opacity 0.2s ease, background 0.2s ease, transform 0.4s var(--ease-spring);
}

.language-button {
  font-size: 0.82rem;
  font-weight: 650;
  letter-spacing: 0.02em;
}

.icon-button:hover,
.language-button:hover {
  background: color-mix(in srgb, currentColor 9%, transparent);
  opacity: 1;
}

.icon-button:active,
.language-button:active {
  transform: scale(0.9);
}

.icon-button .i {
  width: 19px;
  height: 19px;
  transition: transform 0.6s var(--ease-spring);
}

#themeToggle:hover .i {
  transform: rotate(-24deg);
}

.mobile-menu-button {
  display: none;
}

.mobile-nav {
  display: none;
}

/* --------------------------------------------------------------------------
 * 4. Hero —— 深色产品舞台
 * -------------------------------------------------------------------------- */
.hero {
  position: relative;
  display: flex;
  min-height: 100svh;
  flex-direction: column;
  align-items: center;
  padding: 136px 0 0;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(120% 90% at 50% 110%, rgba(111, 196, 145, 0.14), transparent 55%),
    linear-gradient(180deg, var(--stage-1) 0%, var(--stage-2) 52%, var(--stage-3) 100%);
  color: var(--stage-ink);
  text-align: center;
}

/* 背景层：极光 + 声波涟漪 + 点阵 + 指针光斑 */
.hero-backdrop {
  position: absolute;
  z-index: -1;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.aurora {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  mix-blend-mode: screen;
  opacity: 0.6;
  will-change: transform;
}

.aurora-a {
  top: -220px;
  left: calc(50% - 640px);
  width: 640px;
  height: 640px;
  background: radial-gradient(circle, rgba(111, 196, 145, 0.5), transparent 66%);
  animation: aurora-a 24s ease-in-out infinite alternate;
}

.aurora-b {
  top: 40px;
  right: calc(50% - 660px);
  width: 560px;
  height: 560px;
  background: radial-gradient(circle, rgba(70, 150, 190, 0.42), transparent 66%);
  animation: aurora-b 28s ease-in-out infinite alternate;
}

.aurora-c {
  bottom: -220px;
  left: 50%;
  width: 900px;
  height: 460px;
  margin-left: -450px;
  background: radial-gradient(closest-side, rgba(111, 196, 145, 0.32), transparent);
  animation: aurora-c 19s ease-in-out infinite alternate;
}

@keyframes aurora-a {
  0% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(140px, 80px, 0) scale(1.18); }
  100% { transform: translate3d(60px, 160px, 0) scale(0.94); }
}

@keyframes aurora-b {
  0% { transform: translate3d(0, 0, 0) scale(1.05); }
  50% { transform: translate3d(-120px, 60px, 0) scale(0.9); }
  100% { transform: translate3d(-40px, -60px, 0) scale(1.15); }
}

@keyframes aurora-c {
  0% { transform: translate3d(-80px, 0, 0) scale(1); }
  100% { transform: translate3d(80px, -40px, 0) scale(1.12); }
}

/* 声波涟漪：三圈错相扩散，像一次持续的「开口」 */
.hero-rings i {
  position: absolute;
  top: 36%;
  left: 50%;
  width: 560px;
  height: 560px;
  margin: -280px 0 0 -280px;
  border: 1px solid rgba(111, 196, 145, 0.28);
  border-radius: 50%;
  opacity: 0;
  animation: ring-pulse 7.5s cubic-bezier(0.2, 0.6, 0.3, 1) infinite;
}

.hero-rings i:nth-child(2) { animation-delay: 2.5s; }
.hero-rings i:nth-child(3) { animation-delay: 5s; }

@keyframes ring-pulse {
  0% { opacity: 0; transform: scale(0.3); }
  14% { opacity: 0.9; }
  100% { opacity: 0; transform: scale(2); }
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(255, 255, 255, 0.09) 1px, transparent 1px);
  background-size: 28px 28px;
  -webkit-mask-image: radial-gradient(ellipse 70% 55% at 50% 28%, #000 25%, transparent 75%);
  mask-image: radial-gradient(ellipse 70% 55% at 50% 28%, #000 25%, transparent 75%);
}

/* 指针光斑：--hx / --hy 由 site.js 以插值方式写入，移动有「拖尾」 */
.hero-spot {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    560px circle at var(--hx, 50%) var(--hy, 30%),
    rgba(111, 196, 145, 0.13),
    transparent 62%
  );
}

/* 文字层随滚动轻微上移淡出（--hp 为 Hero 滚动进度 0 → 1） */
.hero-inner {
  position: relative;
  width: var(--content);
  opacity: calc(1 - var(--hp, 0) * 1.15);
  transform: translate3d(0, calc(var(--hp, 0) * -70px), 0);
}

.launch-pill {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 26px;
  padding: 8px 16px;
  border: 1px solid var(--stage-line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  color: var(--stage-ink-2);
  font-size: 0.82rem;
  font-weight: 550;
  letter-spacing: 0.01em;
}

.launch-dot {
  position: relative;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--stage-accent);
  box-shadow: 0 0 12px rgba(111, 196, 145, 0.9);
}

.launch-dot::after {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--stage-accent);
  content: "";
  animation: ping 2.4s cubic-bezier(0, 0, 0.2, 1) infinite;
}

@keyframes ping {
  0% { opacity: 0.8; transform: scale(1); }
  80%, 100% { opacity: 0; transform: scale(3); }
}

/* H1 承载品类关键词；视觉上是一行流光小标，主口号在其下方 */
.hero-kicker {
  margin: 0 auto 18px;
  background: linear-gradient(
    100deg,
    var(--stage-accent) 0%,
    var(--stage-accent) 38%,
    #e2f7ea 50%,
    var(--stage-accent) 62%,
    var(--stage-accent) 100%
  );
  background-size: 250% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: clamp(0.92rem, 1.4vw, 1.06rem);
  font-weight: 650;
  letter-spacing: 0.04em;
  line-height: 1.5;
  animation: shimmer 6.5s linear infinite;
}

@keyframes shimmer {
  from { background-position: 125% 0; }
  to { background-position: -125% 0; }
}

.hero-slogan {
  margin: 0 0 24px;
}

.slogan-main {
  display: block;
  font-size: clamp(3rem, 7.6vw, 5.7rem);
  font-weight: 700;
  letter-spacing: -0.045em;
  line-height: 1.02;
  text-shadow: 0 0 60px rgba(111, 196, 145, 0.18);
}

.slogan-sub {
  display: block;
  margin-top: 14px;
  color: var(--stage-ink-2);
  font-size: clamp(1.35rem, 2.8vw, 2.1rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.hero-copy {
  max-width: 640px;
  margin: 0 auto 34px;
  color: var(--stage-ink-2);
  font-size: 1.08rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 28px;
}

.store-badge {
  display: inline-flex;
  border-radius: 12px;
  transition: transform 0.5s var(--ease-spring), filter 0.3s ease;
}

.store-badge:hover {
  filter: drop-shadow(0 10px 24px rgba(111, 196, 145, 0.25));
}

.store-badge img {
  width: 171px;
  height: 48px;
}

.ghost-action {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid var(--stage-line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
  color: var(--stage-ink);
  font-size: 0.95rem;
  font-weight: 600;
  transition: background 0.25s ease, border-color 0.25s ease, transform 0.5s var(--ease-spring);
}

.ghost-action:hover {
  border-color: rgba(111, 196, 145, 0.45);
  background: rgba(111, 196, 145, 0.12);
}

.ghost-action .i {
  width: 17px;
  height: 17px;
  transition: transform 0.5s var(--ease-spring);
}

.ghost-action:hover .i {
  transform: translate(3px, -3px) rotate(-8deg);
}

.text-action {
  color: var(--stage-ink-2);
  font-size: 0.95rem;
  font-weight: 550;
  text-decoration: underline;
  text-decoration-color: var(--stage-line);
  text-underline-offset: 5px;
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

.text-action:hover {
  color: var(--stage-ink);
  text-decoration-color: var(--stage-accent);
}

.hero-trust {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 0 0 44px;
  padding: 0;
  color: var(--stage-ink-2);
  font-size: 0.86rem;
  list-style: none;
}

.hero-trust li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.hero-trust .i {
  width: 16px;
  height: 16px;
  color: var(--stage-accent);
}

/* 主视觉舞台：透视容器，内部设备图随滚动从后仰 14° 立到正视 */
.hero-stage {
  position: relative;
  width: min(1060px, 94vw);
  margin: auto 0 0;
  perspective: 1600px;
}

.hero-devices {
  transform: rotateX(calc((1 - var(--hp, 0)) * 14deg)) scale(calc(0.92 + var(--hp, 0) * 0.08));
  transform-origin: 50% 100%;
  will-change: transform;
}

.hero-devices img {
  width: 100%;
  height: auto;
  filter: drop-shadow(0 48px 80px rgba(0, 0, 0, 0.5));
}

/* 语音胶囊：毛玻璃深色药丸，悬浮在 Mac 屏幕下沿 */
.voice-capsule {
  position: absolute;
  z-index: 2;
  bottom: 22%;
  left: 50%;
  display: flex;
  max-width: 92%;
  align-items: center;
  gap: 14px;
  padding: 9px 22px 9px 10px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 999px;
  background: rgba(14, 16, 19, 0.74);
  -webkit-backdrop-filter: blur(18px) saturate(1.6);
  backdrop-filter: blur(18px) saturate(1.6);
  box-shadow: 0 28px 60px -18px rgba(0, 0, 0, 0.75), inset 0 1px 0 rgba(255, 255, 255, 0.08);
  color: var(--stage-ink);
  translate: -50% 0;
}

/*
 * 麦克风胶囊：与键盘真实组件同色同形（156×60pt 的胶囊按比例缩小）。
 * 待机 = 品牌绿 + 麦克风；录音 = 红色 + 7 条声波；长按问 AI = 青色 + 声波；
 * 处理中 = 半透明红 + 转圈；插入成功 = 品牌绿 + 对勾。状态类由 site.js 切换。
 */
.capsule-mic {
  position: relative;
  display: grid;
  width: 78px;
  height: 32px;
  flex: none;
  place-items: center;
  border-radius: 999px;
  background: var(--kb-accent);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.28), 0 6px 18px -6px color-mix(in srgb, var(--kb-accent) 80%, transparent);
  color: #fff;
  transition: background-color 0.35s ease, box-shadow 0.35s ease, transform 0.5s var(--ease-spring);
}

.capsule-mic > * {
  grid-area: 1 / 1;
  transition: opacity 0.25s ease, transform 0.45s var(--ease-spring);
}

.cap-mic {
  width: 17px;
  height: 17px;
  stroke-width: 2.2;
}

.cap-check {
  width: 18px;
  height: 18px;
  stroke-width: 3;
}

.capsule-wave,
.capsule-spin,
.cap-check {
  opacity: 0;
  transform: scale(0.6);
}

.voice-capsule.is-rec .capsule-mic {
  background: var(--kb-red);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.28), 0 6px 22px -6px color-mix(in srgb, var(--kb-red) 85%, transparent);
}

.voice-capsule.is-ai .capsule-mic {
  background: var(--kb-teal);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.28), 0 6px 22px -6px color-mix(in srgb, var(--kb-teal) 85%, transparent);
  transform: scale(1.04);
}

.voice-capsule.is-busy .capsule-mic {
  background: color-mix(in srgb, var(--kb-red) 72%, #2a2d31);
}

.voice-capsule:is(.is-rec, .is-ai, .is-busy, .is-done) .cap-mic {
  opacity: 0;
  transform: scale(0.6);
}

.voice-capsule:is(.is-rec, .is-ai) .capsule-wave,
.voice-capsule.is-busy .capsule-spin,
.voice-capsule.is-done .cap-check {
  opacity: 1;
  transform: none;
}

/* 声波条：site.js 每帧写 scaleY，只动 transform，不触发布局 */
.capsule-wave,
.mic-wave {
  display: flex;
  align-items: center;
}

.capsule-wave {
  height: 16px;
  gap: 2.5px;
}

.capsule-wave i {
  width: 2.5px;
  height: 100%;
  border-radius: 2px;
  background: #ffc7c7;
  transform: scaleY(0.14);
}

.voice-capsule.is-ai .capsule-wave i {
  background: #fff;
}

/* 系统风格的转圈：处理中状态 */
.capsule-spin,
.mic-spin {
  width: 15px;
  height: 15px;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { rotate: 1turn; }
}

.capsule-body {
  display: flex;
  min-width: min(400px, 52vw);
  align-items: center;
  gap: 10px;
  font-size: 0.98rem;
  text-align: left;
  white-space: nowrap;
}

.capsule-tag {
  flex: none;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(111, 196, 145, 0.16);
  color: var(--stage-accent);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: background 0.3s ease, color 0.3s ease;
}

/* 标签颜色跟随胶囊状态：问 AI 用青色，与麦克风胶囊呼应 */
.voice-capsule:is(.is-ai, .is-ai-busy) .capsule-tag {
  background: color-mix(in srgb, var(--kb-teal) 22%, transparent);
  color: #7fded4;
}

.capsule-line {
  overflow: hidden;
  min-width: 0;
  text-overflow: ellipsis;
}

.caret {
  display: inline-block;
  width: 2px;
  height: 1.1em;
  flex: none;
  margin-left: 1px;
  border-radius: 1px;
  background: var(--stage-accent);
  vertical-align: -0.18em;
  animation: caret-blink 1.05s steps(1) infinite;
}

@keyframes caret-blink {
  50% { opacity: 0; }
}

.scroll-cue {
  position: absolute;
  z-index: 3;
  right: 32px;
  bottom: 30px;
  display: grid;
  width: 24px;
  height: 38px;
  justify-items: center;
  padding-top: 7px;
  border: 1.5px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  opacity: calc(1 - var(--hp, 0) * 4);
}

.scroll-cue span {
  width: 3px;
  height: 8px;
  border-radius: 3px;
  background: var(--stage-ink);
  animation: cue 2s var(--ease-in-out) infinite;
}

@keyframes cue {
  0% { opacity: 0; transform: translateY(-3px); }
  30% { opacity: 1; }
  100% { opacity: 0; transform: translateY(12px); }
}

/* 首屏进场：Hero 元素按 --d 错峰「浮现 + 去模糊」 */
html.js .hero-in {
  animation: rise-in 1.1s var(--ease-out) var(--d, 0s) both;
}

@keyframes rise-in {
  from { opacity: 0; filter: blur(8px); translate: 0 26px; }
  to { opacity: 1; filter: none; translate: 0 0; }
}

html.js .voice-capsule {
  animation: capsule-in 1.1s var(--ease-spring) 1.6s both;
}

@keyframes capsule-in {
  from { opacity: 0; transform: translateY(24px) scale(0.86); }
  to { opacity: 1; transform: none; }
}

/* --------------------------------------------------------------------------
 * 5. 逐字动效（data-split）
 * site.js 把文字拆成 .w（词，防止英文断词）与 .ch（字符），
 * 每个字符带 --ci 序号，延迟 = 基础延迟 + 序号 × 步长。
 * -------------------------------------------------------------------------- */
[data-split] .w {
  display: inline-block;
  white-space: nowrap;
}

[data-split] .ch {
  display: inline-block;
}

/* 拆分完成前先隐藏，避免「整句出现 → 被拆开重播」的闪烁 */
html.js [data-split]:not(.is-split) {
  opacity: 0;
}

/* Hero 口号：页面加载即播放 */
html.js .hero-slogan .ch {
  animation: char-in 1s var(--ease-out) both;
  animation-delay: calc(var(--base, 0.2s) + var(--ci) * var(--step, 45ms));
}

.slogan-main { --base: 0.22s; --step: 52ms; }
.slogan-sub { --base: 0.52s; --step: 24ms; }

@keyframes char-in {
  from { opacity: 0; filter: blur(10px); transform: translateY(0.55em) rotate(3deg); }
  to { opacity: 1; filter: none; transform: none; }
}

/* 区块标题：所在 .reveal 进入视口时播放 */
html.js .reveal [data-split] .ch {
  opacity: 0;
  filter: blur(8px);
  transform: translateY(0.5em);
  transition: opacity 0.7s ease-out, filter 0.7s ease-out, transform 0.95s var(--ease-out);
  transition-delay: calc(var(--d, 0s) + 0.08s + var(--ci) * 24ms);
}

html.js .reveal.is-visible [data-split] .ch {
  opacity: 1;
  filter: blur(0);
  transform: none;
}

/* --------------------------------------------------------------------------
 * 6. 能力跑马灯
 * -------------------------------------------------------------------------- */
.marquee {
  overflow: hidden;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  background: var(--canvas);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 9%, #000 91%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 9%, #000 91%, transparent);
}

.marquee-track {
  display: flex;
  width: max-content;
  animation: marquee 52s linear infinite;
}

.marquee:hover .marquee-track {
  animation-play-state: paused;
}

.marquee ul {
  display: flex;
  margin: 0;
  padding: 0;
  list-style: none;
}

.marquee li {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-right: 16px;
  color: var(--ink-3);
  font-size: clamp(0.6rem, 0.9vw, 0.72rem);
  font-weight: 650;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.marquee li:nth-child(-n + 3) {
  color: var(--ink);
}

.marquee li::after {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--accent);
  content: "";
  opacity: 0.55;
}

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

/* --------------------------------------------------------------------------
 * 7. 通用区块节奏
 * -------------------------------------------------------------------------- */
.section {
  padding: clamp(88px, 11vw, 136px) 0;
}

.section-alt {
  background: var(--surface-soft);
}

.section-inner {
  width: var(--content);
  margin: 0 auto;
}

.eyebrow {
  margin-bottom: 14px;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 650;
  letter-spacing: 0.06em;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(1.9rem, 3.8vw, 2.8rem);
  font-weight: 700;
  letter-spacing: -0.024em;
  line-height: 1.14;
}

h3 {
  font-size: 1.12rem;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.center-heading {
  max-width: 700px;
  margin: 0 auto clamp(48px, 6vw, 72px);
  text-align: center;
}

.center-heading p:not(.eyebrow) {
  color: var(--ink-2);
  font-size: 1.05rem;
}

/* 分栏布局：文案 + 媒体 */
.split-layout {
  display: grid;
  align-items: center;
  gap: clamp(40px, 6vw, 88px);
  grid-template-columns: 1.02fr 1fr;
}

/* 账号段落只保留文字，限制行宽保证可读性 */
.account-layout .feature-copy {
  max-width: 760px;
}

.split-layout.reverse .feature-copy {
  order: 2;
}

.split-layout.reverse .media-frame,
.split-layout.reverse .device-stage {
  order: 1;
}

.feature-copy > p:not(.eyebrow) {
  color: var(--ink-2);
  font-size: 1.05rem;
}

.feature-note {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--ink-3);
  font-size: 0.92rem;
}

/* 实机媒体框：边框 + 定向长投影，呼应 iOS 端 2.1 的卡片层次 */
.media-frame {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface-strong);
  box-shadow: var(--shadow-media);
}

.media-frame video,
.media-frame img {
  width: 100%;
  height: auto;
}

/* --------------------------------------------------------------------------
 * 8. 四种输入方式速览
 * -------------------------------------------------------------------------- */
.ways-section {
  padding: clamp(64px, 8vw, 96px) 0;
}

.ways-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(4, 1fr);
}

.way-card {
  display: block;
  padding: 26px 24px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  transition: transform 0.5s var(--ease-out), box-shadow 0.35s ease, border-color 0.35s ease;
}

.way-card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-card);
}

.way-icon {
  position: relative;
  display: inline-grid;
  width: 46px;
  height: 46px;
  margin-bottom: 18px;
  place-items: center;
  border-radius: 14px;
  background: var(--accent-soft);
  color: var(--accent);
}

.way-icon .i {
  width: 23px;
  height: 23px;
}

/* 图标微动效：每张卡片一个与功能对应的小动作 */
.way-icon-mic::after {
  position: absolute;
  inset: 0;
  border: 1.5px solid var(--accent);
  border-radius: inherit;
  content: "";
  opacity: 0;
}

.way-card:hover .way-icon-mic::after {
  animation: orb-ripple 1.4s cubic-bezier(0.2, 0.6, 0.3, 1) infinite;
}

.way-card:hover .way-icon-sparkle .i {
  animation: twinkle 0.9s var(--ease-spring);
}

.way-card:hover .way-icon-bubble .i {
  animation: bob 0.9s var(--ease-spring);
}

.way-card:hover .way-icon-paste .i {
  animation: drop 0.9s var(--ease-spring);
}

@keyframes twinkle {
  0% { transform: scale(1) rotate(0); }
  40% { transform: scale(0.7) rotate(-40deg); }
  100% { transform: scale(1) rotate(0); }
}

@keyframes bob {
  0% { transform: translateY(0); }
  35% { transform: translateY(-5px) rotate(-6deg); }
  100% { transform: translateY(0); }
}

@keyframes drop {
  0% { transform: translateY(0); }
  35% { transform: translateY(4px) scale(0.92); }
  100% { transform: translateY(0); }
}

.way-card h3 {
  margin-bottom: 6px;
}

.way-card p {
  margin: 0;
  color: var(--ink-2);
  font-size: 0.92rem;
  line-height: 1.55;
}

/* --------------------------------------------------------------------------
 * 9. 滚动叙事（三幕剧）
 * 滚动进度决定当前幕；手机里播放这一幕的真机录屏，幕内进度条跟随播放进度（--ap）。
 * 无 JavaScript 时三幕文案平铺，手机停在第一幕的首帧。
 * -------------------------------------------------------------------------- */
.story-section {
  padding-bottom: 0;
}

.story-section .center-heading {
  margin-bottom: 0;
}

.story {
  position: relative;
  height: 430vh;
}

.story-sticky {
  position: sticky;
  top: 0;
  display: flex;
  height: 100vh;
  height: 100svh;
  align-items: center;
  padding-top: 64px;
}

.story-layout {
  display: grid;
  width: var(--content);
  align-items: center;
  gap: clamp(40px, 7vw, 120px);
  margin: 0 auto;
  grid-template-columns: 1fr auto;
}

.story-acts {
  display: grid;
  max-width: 540px;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.story-act {
  display: flex;
  gap: 22px;
  padding: 22px 24px;
  border-radius: var(--radius-lg);
  opacity: 0.36;
  transition: opacity 0.5s ease, background 0.5s ease, box-shadow 0.5s ease,
    transform 0.7s var(--ease-out);
}

.story-act.is-active {
  background: var(--surface);
  box-shadow: var(--shadow-card), inset 0 0 0 1px var(--line);
  opacity: 1;
  transform: translateX(6px);
}

.act-index {
  padding-top: 3px;
  color: var(--accent);
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.act-body {
  flex: 1;
}

.act-kicker {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.act-body h3 {
  margin-bottom: 8px;
  font-size: clamp(1.22rem, 2vw, 1.55rem);
  letter-spacing: -0.02em;
}

.act-body > p:not(.act-kicker) {
  margin: 0;
  color: var(--ink-2);
  font-size: 0.97rem;
}

/* 幕内进度条：--ap 由 site.js 写入（0 → 1） */
.act-bar {
  display: block;
  overflow: hidden;
  height: 2px;
  margin-top: 16px;
  border-radius: 2px;
  background: var(--line);
}

.act-bar i {
  display: block;
  height: 100%;
  background: var(--accent);
  transform: scaleX(var(--ap, 0));
  transform-origin: left;
  transition: transform 0.3s linear;
}

/* 舞台：真机 + 背后呼吸光晕 */
.story-device {
  position: relative;
  display: grid;
  place-items: center;
}

.story-device::before {
  position: absolute;
  width: 140%;
  height: 80%;
  border-radius: 50%;
  background: radial-gradient(closest-side, color-mix(in srgb, var(--accent) 26%, transparent), transparent);
  content: "";
  filter: blur(30px);
  animation: device-glow 6s ease-in-out infinite;
}

@keyframes device-glow {
  0%, 100% { opacity: 0.45; transform: scale(1); }
  50% { opacity: 0.85; transform: scale(1.08); }
}

/* --------------------------------------------------------------------------
 * 真机外框：Apple 官方 iPhone 17 Pro 机框图（原图 1350 × 2760）。
 * 屏幕开口为 1206 × 2622、起点 (72, 69)，换算成百分比后放置录屏；
 * 模拟器录屏正是这个分辨率，像素一一对应。机框自带灵动岛与圆角，叠在录屏之上。
 * -------------------------------------------------------------------------- */
.iphone {
  --w: min(330px, calc((100svh - 150px) * 0.489));
  position: relative;
  width: var(--w);
  aspect-ratio: 1350 / 2760;
  filter: drop-shadow(0 40px 48px rgba(8, 12, 16, 0.26)) drop-shadow(0 12px 16px rgba(8, 12, 16, 0.14));
}

.iphone-screen {
  position: absolute;
  top: 2.5%;
  left: 5.333%;
  width: 89.333%;
  height: 95%;
  overflow: hidden;
  /* 开口圆角约 230px：230 / 1206 与 230 / 2622 */
  border-radius: 19% / 8.8%;
  background: #000;
}

/* 同一屏幕里叠放多段录屏，当前一段淡入 */
.iphone-clip {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.5s var(--ease-out);
}

.iphone-clip.is-on {
  opacity: 1;
}

.iphone-bezel {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  user-select: none;
}

/* 分栏区块里的真机：与文案并排居中 */
.device-stage {
  display: grid;
  margin: 0;
  place-items: center;
}

.device-stage .iphone {
  --w: min(320px, 76vw);
}

/* --------------------------------------------------------------------------
 * 10. 数字带
 * -------------------------------------------------------------------------- */
.numbers-section {
  padding: clamp(64px, 8vw, 104px) 0;
}

.numbers-grid {
  display: grid;
  gap: 28px;
  grid-template-columns: repeat(4, 1fr);
}

.number {
  position: relative;
  padding-top: 24px;
}

/* 顶部细线随进场从左向右「画」出 */
.number::before {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--accent), var(--line-strong) 40%);
  content: "";
  transform-origin: 0 50%;
  transition: transform 1.3s var(--ease-out) var(--d, 0s);
}

html.js .number:not(.is-visible)::before {
  transform: scaleX(0);
}

.number strong {
  display: block;
  margin-bottom: 12px;
  background: linear-gradient(180deg, var(--ink) 30%, color-mix(in srgb, var(--ink) 50%, var(--accent)));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: clamp(2.4rem, 4.8vw, 3.7rem);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: -0.045em;
  line-height: 1;
}

.number span {
  display: block;
  max-width: 24ch;
  color: var(--ink-2);
  font-size: 0.94rem;
}

/* --------------------------------------------------------------------------
 * 11. 功能区块细节
 * -------------------------------------------------------------------------- */
.step-list {
  display: grid;
  gap: 20px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.step-list li {
  display: flex;
  align-items: flex-start;
  gap: 18px;
}

.step-index {
  padding-top: 2px;
  color: var(--accent);
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.step-list h3 {
  margin-bottom: 4px;
}

.step-list p {
  margin: 0;
  color: var(--ink-2);
  font-size: 0.95rem;
}

.mini-feature {
  margin-top: 24px;
}

.mini-feature h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}

.mini-feature h3 .i {
  width: 19px;
  height: 19px;
  color: var(--accent);
}

.mini-feature p {
  margin: 0;
  color: var(--ink-2);
  font-size: 0.97rem;
}

.skill-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 26px 0 4px;
}

.skill-chips > span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  font-size: 0.88rem;
  font-weight: 550;
  transition: transform 0.5s var(--ease-spring), border-color 0.25s ease, color 0.25s ease;
}

.skill-chips > span:hover {
  border-color: color-mix(in srgb, var(--accent) 50%, transparent);
  color: var(--accent);
  transform: translateY(-3px);
}

.skill-chips .i {
  width: 15px;
  height: 15px;
  color: var(--accent);
}

/* 进场用 animation 而非 transition，避免进场延迟拖慢之后的悬停反馈 */
html.js .reveal:not(.is-visible) .skill-chips > span {
  opacity: 0;
}

html.js .reveal.is-visible .skill-chips > span {
  animation: chip-in 0.8s var(--ease-spring) both;
  animation-delay: calc(0.3s + var(--ci, 0) * 60ms);
}

@keyframes chip-in {
  from { opacity: 0; transform: translateY(12px) scale(0.85); }
  to { opacity: 1; transform: none; }
}

.quiet-list {
  display: grid;
  gap: 12px;
  margin: 24px 0 0;
  padding: 0;
  color: var(--ink-2);
  font-size: 0.95rem;
  list-style: none;
}

.quiet-list li {
  position: relative;
  padding-left: 26px;
}

.quiet-list li::before {
  position: absolute;
  top: 2px;
  left: 0;
  width: 16px;
  height: 16px;
  color: var(--accent);
  /* 内联 check 图标，避免外部字体依赖 */
  content: "";
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E") center / contain no-repeat;
  background: currentColor;
}

/* --------------------------------------------------------------------------
 * 12. 嘴替输入法（2.1 卖点）
 * -------------------------------------------------------------------------- */
.personal-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(3, 1fr);
}

.personal-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--surface);
  transition: transform 0.5s var(--ease-out), box-shadow 0.35s ease;
}

.personal-card:hover {
  box-shadow: var(--shadow-card);
  transform: translateY(-6px);
}

.personal-media {
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--surface-strong);
}

.personal-media img,
.personal-media video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  transition: transform 1.2s var(--ease-out);
}

.personal-card:hover .personal-media img,
.personal-card:hover .personal-media video {
  transform: scale(1.04);
}

.personal-card h3 {
  margin: 22px 24px 8px;
}

.personal-card p {
  margin: 0;
  padding: 0 24px 26px;
  color: var(--ink-2);
  font-size: 0.94rem;
}

/* --------------------------------------------------------------------------
 * 13. 隐私：三种服务路径（深色舞台）
 * -------------------------------------------------------------------------- */
.privacy-section {
  --spot-color: var(--stage-accent);
  background: linear-gradient(180deg, var(--stage-2), var(--stage-3));
  color: var(--stage-ink);
}

.center-heading.inverse p:not(.eyebrow) {
  color: var(--stage-ink-2);
}

.privacy-section .eyebrow {
  color: var(--stage-accent);
}

/* 端侧徽记：声波在设备轮廓内跳动，轨道粒子绕行但从不越界 */
.device-emblem {
  position: relative;
  width: 124px;
  height: 124px;
  margin: 0 auto 26px;
}

.device-emblem::before {
  position: absolute;
  inset: -20%;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(111, 196, 145, 0.28), transparent);
  content: "";
  animation: breathe 4s ease-in-out infinite;
}

@keyframes breathe {
  50% { opacity: 0.45; transform: scale(0.9); }
}

.device-emblem svg {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.emblem-orbit {
  fill: none;
  stroke: rgba(111, 196, 145, 0.4);
  stroke-dasharray: 2 6;
  stroke-width: 1;
}

.emblem-spin {
  fill: var(--stage-accent);
  transform-origin: 80px 80px;
  animation: spin 10s linear infinite;
}

.emblem-spin-rev {
  opacity: 0.6;
  animation-direction: reverse;
  animation-duration: 15s;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.emblem-device {
  fill: rgba(255, 255, 255, 0.04);
  stroke: rgba(255, 255, 255, 0.42);
  stroke-width: 1.5;
}

.emblem-wave rect {
  fill: var(--stage-accent);
  transform-box: fill-box;
  transform-origin: center;
  animation: eq 1.3s ease-in-out infinite;
}

.emblem-wave rect:nth-child(2) { animation-delay: -0.2s; }
.emblem-wave rect:nth-child(3) { animation-delay: -0.45s; }
.emblem-wave rect:nth-child(4) { animation-delay: -0.7s; }
.emblem-wave rect:nth-child(5) { animation-delay: -0.95s; }

@keyframes eq {
  0%, 100% { transform: scaleY(0.45); }
  50% { transform: scaleY(1); }
}

.service-paths {
  display: grid;
  align-items: stretch;
  gap: 18px;
  grid-template-columns: 1.25fr 1fr 1fr;
}

.service-paths article {
  position: relative;
  padding: 30px 28px 26px;
  border: 1px solid var(--stage-line);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.045);
}

.service-paths .path-primary {
  border-color: rgba(111, 196, 145, 0.35);
  background: rgba(111, 196, 145, 0.08);
}

.path-badge {
  position: absolute;
  top: 22px;
  right: 24px;
  padding: 4px 11px;
  border-radius: 999px;
  background: var(--stage-accent);
  color: #0c0e12;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.path-icon {
  width: 26px;
  height: 26px;
  margin-bottom: 18px;
  color: var(--stage-accent);
}

.service-paths h3 {
  margin-bottom: 10px;
  font-size: 1.25rem;
}

.service-paths p {
  color: var(--stage-ink-2);
  font-size: 0.95rem;
}

.path-note {
  display: block;
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--stage-line);
  color: var(--stage-ink-2);
  font-size: 0.82rem;
  letter-spacing: 0.01em;
}

.privacy-proof {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  margin-top: 22px;
  padding: 26px 30px;
  border: 1px solid var(--stage-line);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.045);
}

.privacy-proof > div {
  display: flex;
  align-items: center;
  gap: 16px;
}

.privacy-proof .i {
  width: 26px;
  height: 26px;
  flex: none;
  color: var(--stage-accent);
}

.privacy-proof h3 {
  margin: 0;
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: 0;
}

.inverse-link {
  display: inline-flex;
  flex: none;
  align-items: center;
  gap: 7px;
  color: var(--stage-ink);
  font-size: 0.92rem;
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--stage-line);
  text-underline-offset: 5px;
  transition: text-decoration-color 0.2s ease;
}

.inverse-link:hover {
  text-decoration-color: var(--stage-ink);
}

.inverse-link .i {
  width: 15px;
  height: 15px;
  transition: transform 0.5s var(--ease-spring);
}

.inverse-link:hover .i {
  transform: translate(3px, -3px);
}

/* --------------------------------------------------------------------------
 * 14. 平台
 * -------------------------------------------------------------------------- */
.platform-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr 1fr;
}

.platform-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--surface);
  transition: box-shadow 0.35s ease;
}

.platform-card:hover {
  box-shadow: var(--shadow-card);
}

.platform-card .media-frame {
  margin: 14px 14px 0;
  aspect-ratio: 4 / 3;
  border-radius: var(--radius-md);
  box-shadow: none;
}

.platform-card .media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
  transition: transform 1.4s var(--ease-out);
}

.platform-card:hover .media-frame img {
  transform: scale(1.035);
}

.platform-label {
  display: block;
  margin: 24px 28px 8px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.07em;
}

.platform-card h3 {
  margin: 0 28px 10px;
}

.platform-card > p {
  margin: 0;
  padding: 0 28px 30px;
  color: var(--ink-2);
  font-size: 0.95rem;
}

.platform-footnote {
  max-width: 720px;
  margin: 28px auto 0;
  color: var(--ink-3);
  font-size: 0.88rem;
  text-align: center;
}

/* --------------------------------------------------------------------------
 * 15. 稳定性信任条
 * -------------------------------------------------------------------------- */
.reliability-section {
  padding: clamp(48px, 6vw, 72px) 0;
}

.reliability-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px 40px;
  padding: 26px 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--surface);
}

.strip-title {
  flex: none;
  font-size: 0.95rem;
  font-weight: 650;
}

.reliability-strip ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  margin: 0;
  padding: 0;
  color: var(--ink-2);
  font-size: 0.88rem;
  list-style: none;
}

.reliability-strip li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.reliability-strip li::before {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  content: "";
}

/* --------------------------------------------------------------------------
 * 16. FAQ（展开高度由 site.js 用 Web Animations 过渡）
 * -------------------------------------------------------------------------- */
.faq-layout {
  display: grid;
  align-items: start;
  gap: clamp(40px, 6vw, 80px);
  grid-template-columns: 1fr 1.4fr;
}

.faq-heading {
  position: sticky;
  top: 100px;
}

.faq-item {
  overflow: hidden;
  border-top: 1px solid var(--line);
}

.faq-item:last-child {
  border-bottom: 1px solid var(--line);
}

.faq-item summary {
  position: relative;
  padding: 20px 40px 20px 0;
  cursor: pointer;
  font-size: 1.02rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  list-style: none;
  transition: color 0.2s ease;
}

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

.faq-item summary::after {
  position: absolute;
  top: 22px;
  right: 4px;
  width: 18px;
  height: 18px;
  color: var(--ink-3);
  content: "";
  -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9.5l6 6 6-6'/%3E%3C/svg%3E") center / contain no-repeat;
  mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9.5l6 6 6-6'/%3E%3C/svg%3E") center / contain no-repeat;
  background: currentColor;
  transition: transform 0.5s var(--ease-spring);
}

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

.faq-item summary:hover {
  color: var(--accent);
}

.faq-item p {
  margin: 0;
  padding: 0 32px 22px 0;
  color: var(--ink-2);
  font-size: 0.95rem;
}

.faq-item[open] p {
  animation: faq-in 0.5s var(--ease-out);
}

@keyframes faq-in {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

/* --------------------------------------------------------------------------
 * 17. 下载 CTA（深色舞台，与 Hero 呼应）
 * -------------------------------------------------------------------------- */
.download-section {
  padding-top: 0;
}

.faq-section + .download-section {
  padding-top: clamp(72px, 9vw, 120px);
}

.download-panel {
  position: relative;
  display: flex;
  overflow: hidden;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  padding: clamp(40px, 6vw, 80px);
  border-radius: calc(var(--radius-xl) + 4px);
  isolation: isolate;
  background:
    radial-gradient(110% 130% at 90% 120%, rgba(111, 196, 145, 0.16), transparent 55%),
    linear-gradient(160deg, var(--stage-1), var(--stage-3));
  color: var(--stage-ink);
}

.download-backdrop {
  position: absolute;
  z-index: -1;
  inset: 0;
  pointer-events: none;
}

.download-backdrop .aurora-a {
  top: -60%;
  left: -12%;
  width: 520px;
  height: 520px;
}

.download-backdrop .aurora-b {
  top: auto;
  right: -14%;
  bottom: -70%;
  width: 520px;
  height: 520px;
}

/* 声波路径：虚线沿曲线流动，两条反向错速 */
.download-wave {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 55%;
  opacity: 0.45;
}

.download-wave path {
  fill: none;
  stroke: var(--stage-accent);
  stroke-dasharray: 6 12;
  stroke-width: 1.5;
  vector-effect: non-scaling-stroke;
  animation: dash-flow 5s linear infinite;
}

.download-wave path:nth-child(2) {
  opacity: 0.5;
  animation-direction: reverse;
  animation-duration: 8s;
}

@keyframes dash-flow {
  to { stroke-dashoffset: -180; }
}

.download-copy h2 {
  margin-bottom: 12px;
  font-size: clamp(2rem, 4.2vw, 3.1rem);
}

.download-copy p {
  max-width: 460px;
  margin: 0;
  color: var(--stage-ink-2);
}

.download-panel .eyebrow {
  color: var(--stage-accent);
}

.download-actions {
  display: flex;
  flex: none;
  flex-direction: column;
  align-items: stretch;
  gap: 14px;
}

.outline-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 13px 22px;
  border: 1px solid var(--stage-line);
  border-radius: 999px;
  color: var(--stage-ink);
  font-size: 0.92rem;
  font-weight: 600;
  transition: background 0.25s ease, border-color 0.25s ease, transform 0.5s var(--ease-spring);
}

.outline-action:hover {
  border-color: rgba(111, 196, 145, 0.45);
  background: rgba(255, 255, 255, 0.08);
}

.outline-action .i {
  width: 16px;
  height: 16px;
}

/* --------------------------------------------------------------------------
 * 18. 页脚
 * -------------------------------------------------------------------------- */
.site-footer {
  padding: 44px 0 52px;
}

.footer-inner {
  display: flex;
  width: var(--content);
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin: 0 auto;
  color: var(--ink-3);
  font-size: 0.86rem;
}

.footer-links {
  display: flex;
  gap: 26px;
}

.footer-links a {
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--ink);
}

/* --------------------------------------------------------------------------
 * 19. 动效系统：滚动显现 / 遮罩揭示 / 光斑 / 倾斜 / 磁吸 / 主题过渡
 * -------------------------------------------------------------------------- */
/*
 * 进场只动 opacity + translate（独立属性），把 transform 留给悬停倾斜与视差，
 * 两套动效互不覆盖。进场延迟只作用在进场属性上，悬停反馈始终即时。
 */
html.js .reveal {
  opacity: 0;
  translate: 0 30px;
  transition-delay: var(--d, 0s), var(--d, 0s), 0s, 0s, 0s, var(--d, 0s);
  transition-duration: 0.9s, 1.05s, 0.5s, 0.35s, 0.35s, 1.25s;
  transition-property: opacity, translate, transform, box-shadow, border-color, clip-path;
  transition-timing-function: ease-out, var(--ease-out), var(--ease-out), ease, ease, var(--ease-out);
}

html.js .reveal.is-visible {
  opacity: 1;
  translate: 0 0;
}

/* 视差元素的 transform 每帧由脚本写入，不再叠加过渡 */
html.js .reveal[data-parallax] {
  transition-duration: 0.9s, 1.05s, 0s, 0.35s, 0.35s, 1.25s;
}

/* 遮罩揭示：媒体框从内缩的圆角矩形展开，内部画面同时从 112% 回落 */
html.js .unmask.reveal {
  clip-path: inset(9% 7% 9% 7% round var(--radius-lg));
}

html.js .unmask.reveal.is-visible {
  clip-path: inset(0 0 0 0 round var(--radius-lg));
}

html.js .unmask > video,
html.js .unmask > img {
  transform: scale(1.12);
  transition: transform 1.6s var(--ease-out) var(--d, 0s);
}

html.js .unmask.is-visible > video,
html.js .unmask.is-visible > img {
  transform: none;
}

/* 指针光斑：卡片内部高光 + 边框描光，--mx / --my 由脚本写入 */
.spot {
  position: relative;
  isolation: isolate;
}

.spot::before,
.spot::after {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  content: "";
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.spot::before {
  z-index: -1;
  background: radial-gradient(
    420px circle at var(--mx, 50%) var(--my, 50%),
    color-mix(in srgb, var(--spot-color, var(--accent)) 13%, transparent),
    transparent 46%
  );
}

.spot::after {
  z-index: 2;
  padding: 1px;
  background: radial-gradient(
    260px circle at var(--mx, 50%) var(--my, 50%),
    color-mix(in srgb, var(--spot-color, var(--accent)) 70%, transparent),
    transparent 62%
  );
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box exclude, linear-gradient(#000 0 0);
}

.spot:hover::before,
.spot:hover::after {
  opacity: 1;
}

/* 3D 倾斜：--rx / --ry 由脚本根据指针位置写入 */
.tilt {
  transform: perspective(900px) rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg))
    translateY(var(--lift, 0px));
  transform-style: preserve-3d;
}

.tilt:hover {
  --lift: -5px;
}

/* 主题切换：View Transitions 以按钮为圆心扩散（site.js 驱动 clip-path） */
html.vt-theme::view-transition-old(root),
html.vt-theme::view-transition-new(root) {
  animation: none;
  mix-blend-mode: normal;
}

html.vt-theme::view-transition-new(root) {
  z-index: 1;
}

/* --------------------------------------------------------------------------
 * 20. 减弱动态效果：所有持续动画停止，内容以最终态直接呈现
 * -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    animation-delay: 0s !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
  }

  html.js .reveal,
  html.js .hero-in {
    opacity: 1;
    translate: none;
    filter: none;
  }

  html.js .unmask.reveal {
    clip-path: none;
  }

  html.js .unmask > video,
  html.js .unmask > img {
    transform: none;
  }

  html.js .reveal [data-split] .ch {
    opacity: 1;
    filter: none;
    transform: none;
  }

  .hero-inner,
  .hero-devices {
    opacity: 1;
    transform: none;
  }

  .marquee-track {
    width: auto;
    flex-wrap: wrap;
    justify-content: center;
  }

  .marquee ul[aria-hidden="true"] {
    display: none;
  }

  .marquee ul {
    flex-wrap: wrap;
    justify-content: center;
  }

  .tilt {
    transform: none;
  }
}

/* --------------------------------------------------------------------------
 * 21. 响应式
 * -------------------------------------------------------------------------- */
@media (max-width: 960px) {
  .nav-links {
    display: none;
  }

  .mobile-menu-button {
    display: inline-grid;
  }

  .mobile-nav {
    display: block;
    padding: 8px 24px 18px;
    border-bottom: 1px solid var(--line);
    background: color-mix(in srgb, var(--canvas) 88%, transparent);
    -webkit-backdrop-filter: blur(20px) saturate(1.6);
    backdrop-filter: blur(20px) saturate(1.6);
    color: var(--ink);
  }

  .mobile-nav[hidden] {
    display: none;
  }

  .mobile-nav a {
    display: block;
    padding: 12px 8px;
    border-radius: 10px;
    font-size: 1rem;
  }

  .split-layout,
  .faq-layout {
    grid-template-columns: 1fr;
  }

  .faq-heading {
    position: static;
  }

  .split-layout.reverse .feature-copy {
    order: 1;
  }

  .split-layout.reverse .media-frame,
  .split-layout.reverse .device-stage {
    order: 2;
  }

  .ways-grid,
  .numbers-grid {
    grid-template-columns: 1fr 1fr;
  }

  .personal-grid {
    grid-template-columns: 1fr;
  }

  .service-paths {
    grid-template-columns: 1fr;
  }

  .platform-grid {
    grid-template-columns: 1fr;
  }

  .download-panel {
    flex-direction: column;
    align-items: flex-start;
  }

  .download-actions {
    align-items: flex-start;
  }

  .reliability-strip {
    flex-direction: column;
    align-items: flex-start;
  }

  /* 滚动叙事：手机在上，当前一幕的文案在下方叠放切换 */
  .story {
    height: 400vh;
  }

  .story-layout {
    align-content: center;
    gap: 22px;
    grid-template-columns: 1fr;
    justify-items: center;
  }

  .story-device {
    order: -1;
  }

  .iphone {
    --w: min(260px, calc((100svh - 360px) * 0.489));
  }

  .story-acts {
    position: relative;
    display: block;
    width: 100%;
    max-width: 520px;
    height: 196px;
  }

  .story-act {
    position: absolute;
    inset: 0;
    padding: 16px 20px;
    opacity: 0;
    pointer-events: none;
    transform: translateY(14px);
  }

  .story-act.is-active {
    opacity: 1;
    pointer-events: auto;
    transform: none;
  }

  .act-body > p:not(.act-kicker) {
    font-size: 0.92rem;
  }

  .scroll-cue {
    display: none;
  }
}

@media (max-width: 600px) {
  :root {
    --content: calc(100vw - 40px);
  }

  .hero {
    padding-top: 116px;
  }

  .ways-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    gap: 14px;
  }

  .voice-capsule {
    bottom: 12%;
    gap: 10px;
    padding: 6px 14px 6px 6px;
  }

  .capsule-mic {
    width: 62px;
    height: 28px;
  }

  .capsule-body {
    min-width: min(260px, 70vw);
    font-size: 0.84rem;
  }

  .privacy-proof {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* 无 JavaScript：滚动叙事退化为静态展示，不保留 430vh 的空白滚动距离 */
html.no-js .story {
  height: auto;
}

html.no-js .story-sticky {
  position: static;
  height: auto;
  padding: 48px 0 0;
}

html.no-js .story-act {
  position: static;
  opacity: 1;
  transform: none;
}

html.no-js .story-acts {
  height: auto;
}