/*!
 * OSGKeyboard 主页设计系统（2026-10 亚克力版）
 * 方向：整页是一套「亚克力键帽」—— 与应用图标同一种材质：乳白、半透、顶边高光、底边厚度、柔和弥散投影。
 *   · 材质只有一种，分三档厚度：底板（页面）→ 面板（.acrylic 卡片）→ 键帽（.keycap 按钮 / .chip 标签）。
 *   · 形状只有四档圆角：标签 10 / 按钮 14 / 卡片 24 / 大面板 32；嵌套时内圆角 = 外圆角 − 内边距。
 *   · 品牌绿取自图标（#0B9019），只用于状态与指示，其余全部中性色。
 * 动效母题：「声音变成文字」—— 声波、逐字浮现、流式转写；另加一道跟随指针的亚克力反光。
 * 主题跟随系统（site.js 可手动覆盖），首屏与整页一起切换深浅。
 *
 * 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;

  /* 底板：图标乳白（#F0F2F1）略提亮 */
  --canvas: #eff1f0;
  --ink: #15181a;
  --ink-2: #596067;
  --ink-3: #8b9298;
  --line: rgba(21, 24, 26, 0.08);
  --line-strong: rgba(21, 24, 26, 0.14);

  /* 品牌绿：图标三个圆点的颜色；--accent-ink 用于小字，保证对比度 */
  --accent: #0f9124;
  --accent-ink: #0c7a1f;
  --accent-soft: rgba(15, 145, 36, 0.1);

  /* 底板背后的环境光：亚克力需要背后有东西才能透出质感 */
  --glow-1: rgba(255, 255, 255, 0.95);
  --glow-2: rgba(178, 222, 192, 0.5);
  --glow-3: rgba(196, 214, 232, 0.55);

  /* 面板：半透乳白 + 背景模糊；阴影四层 = 顶边高光 / 底边厚度 / 发丝描边 / 弥散投影 */
  --acrylic-fill: linear-gradient(180deg, rgba(255, 255, 255, 0.84), rgba(255, 255, 255, 0.6));
  --acrylic-edge: rgba(21, 24, 26, 0.07);
  --acrylic-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 1),
    inset 0 -1px 0 rgba(21, 24, 26, 0.04),
    0 0 0 1px var(--acrylic-edge),
    0 1px 2px rgba(21, 24, 26, 0.04),
    0 24px 48px -24px rgba(21, 24, 26, 0.18);
  --acrylic-blur: blur(28px) saturate(1.6);

  /* 键帽：比面板更实；按下时内阴影加深、整体下沉 1px */
  --key-fill: linear-gradient(180deg, #ffffff, #eef0ef);
  --key-shadow:
    inset 0 1px 0 #fff,
    inset 0 -2px 0 rgba(21, 24, 26, 0.06),
    0 0 0 1px rgba(21, 24, 26, 0.09),
    0 2px 3px rgba(21, 24, 26, 0.05),
    0 8px 18px -8px rgba(21, 24, 26, 0.22);
  --key-shadow-hover:
    inset 0 1px 0 #fff,
    inset 0 -2px 0 rgba(21, 24, 26, 0.06),
    0 0 0 1px rgba(21, 24, 26, 0.11),
    0 3px 5px rgba(21, 24, 26, 0.06),
    0 14px 26px -10px rgba(21, 24, 26, 0.26);
  --key-shadow-pressed:
    inset 0 1px 2px rgba(21, 24, 26, 0.14),
    0 0 0 1px rgba(21, 24, 26, 0.1),
    0 1px 1px rgba(21, 24, 26, 0.05);

  /* 指针反光：亚克力表面跟随光标的一块高光 */
  --sheen: rgba(255, 255, 255, 0.75);
  --sheen-edge: rgba(255, 255, 255, 0.95);

  /* 烟熏亚克力：整页唯一的深色时刻（隐私面板） */
  --smoke-fill: linear-gradient(165deg, rgba(34, 38, 41, 0.95), rgba(17, 19, 21, 0.97));
  --smoke-ink: #f2f4f3;
  --smoke-ink-2: #a5adb3;
  --smoke-line: rgba(255, 255, 255, 0.09);
  --smoke-accent: #4fcb68;

  /* 磨砂颗粒：约 5% 的灰噪点，叠在面板最上层 */
  --grain: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='1 0 0 0 0 1 0 0 0 0 1 0 0 0 0 0 0 0 0 .05'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");

  --shadow-device: rgba(21, 24, 26, 0.24);

  /* 四档圆角 */
  --r-chip: 10px;
  --r-btn: 14px;
  --r-card: 24px;
  --r-panel: 32px;

  --content: min(1120px, calc(100vw - 48px));

  /* 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：键帽、标签、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;

  /* 键盘复刻色：取自 App 源码 ColorLibrary（brandAccent / aiTeal / recordRed），只用于首屏语音胶囊 */
  --kb-accent: #3aa05a;
  --kb-teal: #2bafa4;
  --kb-red: #ff3b30;
}

html[data-theme="dark"] {
  --canvas: #0e1011;
  --ink: #eef1f0;
  --ink-2: #a3abb1;
  --ink-3: #79828a;
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.14);

  --accent: #3ec45a;
  --accent-ink: #5fd178;
  --accent-soft: rgba(62, 196, 90, 0.14);

  --glow-1: rgba(255, 255, 255, 0.05);
  --glow-2: rgba(62, 196, 90, 0.1);
  --glow-3: rgba(90, 130, 170, 0.13);

  --acrylic-fill: linear-gradient(180deg, rgba(46, 50, 54, 0.64), rgba(28, 31, 34, 0.52));
  --acrylic-edge: rgba(255, 255, 255, 0.07);
  --acrylic-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.09),
    inset 0 -1px 0 rgba(0, 0, 0, 0.3),
    0 0 0 1px var(--acrylic-edge),
    0 24px 48px -24px rgba(0, 0, 0, 0.6);

  --key-fill: linear-gradient(180deg, #2d3135, #222528);
  --key-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.1),
    inset 0 -2px 0 rgba(0, 0, 0, 0.35),
    0 0 0 1px rgba(255, 255, 255, 0.07),
    0 8px 18px -8px rgba(0, 0, 0, 0.7);
  --key-shadow-hover:
    inset 0 1px 0 rgba(255, 255, 255, 0.12),
    inset 0 -2px 0 rgba(0, 0, 0, 0.35),
    0 0 0 1px rgba(255, 255, 255, 0.1),
    0 14px 26px -10px rgba(0, 0, 0, 0.8);
  --key-shadow-pressed:
    inset 0 1px 3px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.06);

  --sheen: rgba(255, 255, 255, 0.07);
  --sheen-edge: rgba(255, 255, 255, 0.28);

  /* 深色主题下底板已经是深色，烟熏面板略微提亮、带一点绿光，仍是整页最「重」的一块 */
  --smoke-fill: linear-gradient(165deg, rgba(40, 45, 48, 0.86), rgba(20, 23, 25, 0.9));

  --shadow-device: rgba(0, 0, 0, 0.6);
}

/* 支持连续曲率圆角的浏览器：换成与图标一致的「方圆」，半径相应放大以保持视觉大小 */
@supports (corner-shape: squircle) {
  :root {
    --r-chip: 15px;
    --r-btn: 21px;
    --r-card: 38px;
    --r-panel: 50px;
  }

  .acrylic,
  .acrylic-smoke,
  .keycap,
  .chip,
  .language-button,
  .nav-shell,
  .nav-indicator,
  .mobile-nav,
  .media-inset,
  .story-act {
    corner-shape: squircle;
  }
}

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

/* 底色挂在 html 上，body 保持透明，固定的环境光层（body::before）才能透出来 */
html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  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;
  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: var(--r-btn);
  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;
}

/* --------------------------------------------------------------------------
 * 3. 底板：固定的环境光，滚动时面板「滑过」柔光，模糊才有东西可透
 * -------------------------------------------------------------------------- */
body::before {
  position: fixed;
  z-index: -1;
  inset: 0;
  background:
    radial-gradient(55% 45% at 12% 6%, var(--glow-1), transparent 70%),
    radial-gradient(45% 40% at 92% 30%, var(--glow-2), transparent 72%),
    radial-gradient(55% 45% at 30% 100%, var(--glow-3), transparent 72%);
  content: "";
  pointer-events: none;
}

/* --------------------------------------------------------------------------
 * 4. 材质：面板 / 烟熏面板 / 键帽 / 标签
 * -------------------------------------------------------------------------- */
.acrylic {
  border-radius: var(--r-card);
  background: var(--grain), var(--acrylic-fill);
  box-shadow: var(--acrylic-shadow);
  -webkit-backdrop-filter: var(--acrylic-blur);
  backdrop-filter: var(--acrylic-blur);
}

.acrylic-smoke {
  --sheen: rgba(255, 255, 255, 0.06);
  --sheen-edge: rgba(255, 255, 255, 0.3);
  border-radius: var(--r-panel);
  background: var(--grain), var(--smoke-fill);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.12),
    inset 0 -1px 0 rgba(0, 0, 0, 0.4),
    0 0 0 1px rgba(0, 0, 0, 0.08),
    0 40px 80px -36px rgba(10, 14, 16, 0.55);
  color: var(--smoke-ink);
}

/* 键帽：所有按钮统一为圆角长方形（App Store 官方徽章除外） */
.keycap {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 20px;
  border: 0;
  border-radius: var(--r-btn);
  background: var(--key-fill);
  box-shadow: var(--key-shadow);
  color: var(--ink);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  white-space: nowrap;
  transition: box-shadow 0.25s ease, translate 0.25s var(--ease-out), transform 0.5s var(--ease-spring);
}

.keycap:hover {
  box-shadow: var(--key-shadow-hover);
  translate: 0 -1px;
}

.keycap:active {
  box-shadow: var(--key-shadow-pressed);
  translate: 0 1px;
}

.keycap .i {
  width: 17px;
  height: 17px;
  color: var(--ink-2);
  transition: transform 0.5s var(--ease-spring);
}

.keycap:hover .i {
  transform: translate(2px, -2px);
}

/* 标签：小一号的键帽，不可按，只有一层高光和发丝描边 */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 13px;
  border-radius: var(--r-chip);
  background: var(--key-fill);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.9),
    0 0 0 1px var(--line),
    0 4px 10px -6px rgba(21, 24, 26, 0.18);
  color: var(--ink-2);
  font-size: 0.86rem;
  font-weight: 560;
}

html[data-theme="dark"] .chip {
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.08),
    0 0 0 1px var(--line),
    0 4px 10px -6px rgba(0, 0, 0, 0.6);
}

/* --------------------------------------------------------------------------
 * 5. 导航：悬浮的亚克力条
 * -------------------------------------------------------------------------- */
/* 页面滚动进度：导航条底边的一根细线，由 site.js 直接写 transform */
.scroll-progress {
  position: absolute;
  right: 18px;
  bottom: 0;
  left: 18px;
  height: 1.5px;
  border-radius: 2px;
  background: var(--accent);
  opacity: 0.7;
  pointer-events: none;
  transform: scaleX(0);
  transform-origin: 0 50%;
}

.site-nav {
  position: fixed;
  z-index: 50;
  top: 12px;
  right: 0;
  left: 0;
  pointer-events: none;
}

.nav-shell {
  position: relative;
  display: flex;
  width: var(--content);
  height: 58px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 0 auto;
  padding: 0 10px 0 14px;
  overflow: hidden;
  border-radius: 18px;
  background: var(--grain), var(--acrylic-fill);
  box-shadow: var(--acrylic-shadow);
  pointer-events: auto;
  -webkit-backdrop-filter: var(--acrylic-blur);
  backdrop-filter: var(--acrylic-blur);
}

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

.brand img {
  width: 32px;
  height: 32px;
  filter: drop-shadow(0 3px 5px rgba(21, 24, 26, 0.16));
  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;
  color: var(--ink-2);
  font-size: 0.92rem;
  transition: color 0.2s ease;
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--ink);
}

/* 导航滑块：一颗小键帽，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: 36px;
  border-radius: var(--r-chip);
  background: var(--key-fill);
  box-shadow: var(--key-shadow);
  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: 6px;
}

/* 图标按钮保持圆形；语言按钮是文字按钮，与其他按钮一样用圆角长方形 */
.icon-button,
.language-button {
  display: inline-grid;
  min-width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--ink-2);
  cursor: pointer;
  transition: color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease,
    transform 0.4s var(--ease-spring);
}

.icon-button {
  border-radius: 50%;
}

.language-button {
  padding: 0 10px;
  border-radius: var(--r-chip);
  font-size: 0.82rem;
  font-weight: 650;
  letter-spacing: 0.02em;
}

.icon-button:hover,
.language-button:hover {
  background: var(--key-fill);
  box-shadow: var(--key-shadow);
  color: var(--ink);
}

.icon-button:active,
.language-button:active {
  transform: scale(0.92);
}

.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;
}

/* --------------------------------------------------------------------------
 * 6. Hero：乳白（或烟熏）底板上的一颗亚克力键帽
 * -------------------------------------------------------------------------- */
.hero {
  position: relative;
  display: flex;
  min-height: 100svh;
  flex-direction: column;
  align-items: center;
  padding: 128px 0 0;
  overflow: hidden;
  isolation: isolate;
  text-align: center;
}

/* 背景层：柔光 + 声波涟漪 + 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(80px);
  opacity: 0.9;
  will-change: transform;
}

.aurora-a {
  top: -240px;
  left: calc(50% - 680px);
  width: 640px;
  height: 640px;
  background: radial-gradient(circle, var(--glow-2), transparent 66%);
  animation: aurora-a 26s ease-in-out infinite alternate;
}

.aurora-b {
  top: 60px;
  right: calc(50% - 700px);
  width: 580px;
  height: 580px;
  background: radial-gradient(circle, var(--glow-3), transparent 66%);
  animation: aurora-b 30s ease-in-out infinite alternate;
}

.aurora-c {
  top: 26%;
  left: 50%;
  width: 760px;
  height: 420px;
  margin-left: -380px;
  background: radial-gradient(closest-side, var(--glow-1), transparent);
  animation: aurora-c 21s 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(-60px, 0, 0) scale(1); }
  100% { transform: translate3d(60px, -30px, 0) scale(1.1); }
}

/* 声波涟漪：三圈错相扩散，像一次持续的「开口」；中性色，只做气氛 */
.hero-rings i {
  position: absolute;
  top: 24%;
  left: 50%;
  width: 520px;
  height: 520px;
  margin: -260px 0 0 -260px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  opacity: 0;
  animation: ring-pulse 8s cubic-bezier(0.2, 0.6, 0.3, 1) infinite;
}

.hero-rings i:nth-child(2) { animation-delay: 2.66s; }
.hero-rings i:nth-child(3) { animation-delay: 5.33s; }

@keyframes ring-pulse {
  0% { opacity: 0; transform: scale(0.25); }
  14% { opacity: 0.9; }
  100% { opacity: 0; transform: scale(2); }
}

/* 指针光斑：--hx / --hy 由 site.js 以插值方式写入，像一盏灯照在亚克力上 */
.hero-spot {
  position: absolute;
  inset: 0;
  background: radial-gradient(
    520px circle at var(--hx, 50%) var(--hy, 26%),
    var(--sheen),
    transparent 62%
  );
  opacity: 0.8;
}

/* 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);
}

/* 主视觉的第一眼：放大的应用图标，本身就是一颗亚克力键帽；缓慢悬浮，一道反光定期扫过 */
.hero-mark {
  position: relative;
  width: 96px;
  height: 96px;
  margin: 0 auto 26px;
}

.hero-mark img {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 18px 22px rgba(21, 24, 26, 0.16)) drop-shadow(0 4px 6px rgba(21, 24, 26, 0.1));
  animation: mark-float 7s ease-in-out infinite;
}

/* 反光只落在图标自身的形状里（用图标本身做遮罩） */
.hero-mark::after {
  position: absolute;
  inset: 0;
  background: linear-gradient(115deg, transparent 38%, rgba(255, 255, 255, 0.85) 50%, transparent 62%);
  background-size: 300% 100%;
  content: "";
  -webkit-mask: url("app-icon.png?v=20260927b") center / contain no-repeat;
  mask: url("app-icon.png?v=20260927b") center / contain no-repeat;
  mix-blend-mode: soft-light;
  animation: mark-float 7s ease-in-out infinite, mark-sheen 7s ease-in-out infinite;
}

@keyframes mark-float {
  0%, 100% { translate: 0 0; rotate: 0deg; }
  50% { translate: 0 -7px; rotate: -2deg; }
}

@keyframes mark-sheen {
  0%, 55% { background-position: 100% 0; }
  80%, 100% { background-position: 0 0; }
}

html[data-theme="dark"] .hero-mark img {
  filter: drop-shadow(0 18px 26px rgba(0, 0, 0, 0.55)) drop-shadow(0 0 30px rgba(255, 255, 255, 0.06));
}

.launch-pill {
  margin-bottom: 20px;
  font-size: 0.8rem;
}

/* 版本标签上的绿点：整屏唯一的绿色，表示「已上线」 */
.launch-dot {
  position: relative;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

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

@keyframes ping {
  0% { opacity: 0.7; transform: scale(1); }
  80%, 100% { opacity: 0; transform: scale(3); }
}

/* H1 承载品类关键词；视觉上是一行小标，一道银色反光缓慢扫过 */
.hero-kicker {
  margin: 0 auto 16px;
  background: linear-gradient(
    100deg,
    var(--ink-2) 0%,
    var(--ink-2) 40%,
    var(--ink-3) 50%,
    var(--ink-2) 60%,
    var(--ink-2) 100%
  );
  background-size: 250% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-size: clamp(0.9rem, 1.3vw, 1.02rem);
  font-weight: 600;
  letter-spacing: 0.03em;
  line-height: 1.5;
  animation: shimmer 7s linear infinite;
}

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

.hero-slogan {
  margin: 0 0 22px;
}

.slogan-main {
  display: block;
  font-size: clamp(2.9rem, 7.2vw, 5.4rem);
  font-weight: 680;
  letter-spacing: -0.045em;
  line-height: 1.04;
}

.slogan-sub {
  display: block;
  margin-top: 12px;
  color: var(--ink-2);
  font-size: clamp(1.3rem, 2.6vw, 1.95rem);
  font-weight: 560;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.hero-copy {
  max-width: 620px;
  margin: 0 auto 32px;
  color: var(--ink-2);
  font-size: 1.06rem;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 26px;
}

/* App Store / Mac 官方徽章：按 Apple 营销规范原样使用，只加一层悬停浮起 */
.store-badge {
  display: inline-flex;
  border-radius: 10px;
  transition: transform 0.5s var(--ease-spring), filter 0.3s ease;
}

.store-badge:hover {
  filter: drop-shadow(0 10px 18px rgba(21, 24, 26, 0.22));
}

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

.hero-trust {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px 26px;
  margin: 0 0 40px;
  padding: 0;
  color: var(--ink-3);
  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;
}

/* 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 40px 60px var(--shadow-device));
}

/*
 * 语音胶囊：一块悬浮的亚克力面板（圆角长方形），里面的麦克风胶囊与键盘真实组件同色同形。
 * 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。
 */
.voice-capsule {
  position: absolute;
  z-index: 2;
  bottom: 22%;
  left: 50%;
  display: flex;
  max-width: 92%;
  align-items: center;
  gap: 14px;
  padding: 9px 20px 9px 9px;
  border-radius: 18px;
  translate: -50% 0;
}

.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 {
  display: flex;
  height: 16px;
  align-items: center;
  gap: 2.5px;
}

.capsule-wave i {
  width: 2.5px;
  height: 100%;
  border-radius: 2px;
  background: #ffd6d6;
  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 {
  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 9px;
  border-radius: 7px;
  background: var(--line);
  color: var(--ink-2);
  font-size: 0.74rem;
  font-weight: 650;
  letter-spacing: 0.03em;
  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) 16%, transparent);
  color: color-mix(in srgb, var(--kb-teal) 70%, var(--ink));
}

.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(--ink-2);
  vertical-align: -0.18em;
  animation: caret-blink 1.05s steps(1) infinite;
}

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

/* 向下滚动提示：圆角长方形的「鼠标」轮廓 */
.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 var(--line-strong);
  border-radius: 12px;
  opacity: calc(1 - var(--hp, 0) * 4);
}

.scroll-cue span {
  width: 3px;
  height: 8px;
  border-radius: 3px;
  background: var(--ink-3);
  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; }
}

/* --------------------------------------------------------------------------
 * 7. 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: 0.3s; --step: 52ms; }
.slogan-sub { --base: 0.6s; --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;
}

/* --------------------------------------------------------------------------
 * 8. 能力跑马灯：一行安静的中性色小字
 * -------------------------------------------------------------------------- */
.marquee {
  overflow: hidden;
  padding: 14px 0;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
}

.marquee-track {
  display: flex;
  width: max-content;
  animation: marquee 56s 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: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.marquee li:nth-child(-n + 3) {
  color: var(--ink-2);
}

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

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

/* --------------------------------------------------------------------------
 * 9. 区块节奏：所有区块共用同一块底板，靠留白而不是色带分隔
 * -------------------------------------------------------------------------- */
.section {
  padding: clamp(80px, 10vw, 128px) 0;
}

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

.eyebrow {
  margin-bottom: 14px;
  color: var(--ink-3);
  font-size: 0.8rem;
  font-weight: 650;
  letter-spacing: 0.08em;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(1.9rem, 3.7vw, 2.75rem);
  font-weight: 680;
  letter-spacing: -0.026em;
  line-height: 1.14;
}

h3 {
  font-size: 1.1rem;
  font-weight: 640;
  letter-spacing: -0.01em;
}

.center-heading {
  max-width: 700px;
  margin: 0 auto clamp(44px, 6vw, 68px);
  text-align: center;
}

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

/* 分栏布局：文案 + 真机 */
.split-layout {
  display: grid;
  align-items: center;
  gap: clamp(40px, 6vw, 88px);
  grid-template-columns: 1.05fr 1fr;
}

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

.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;
}

/* 嵌在面板里的小画面（截图 / 录屏）：同心圆角 = 卡片圆角 − 内边距 */
.media-inset {
  overflow: hidden;
  border-radius: calc(var(--r-card) - 12px);
  background: var(--canvas);
  box-shadow: 0 0 0 1px var(--line);
}

/* --------------------------------------------------------------------------
 * 10. 滚动叙事（四幕）
 * 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 时四幕文案平铺，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: 520vh;
}

.story-sticky {
  position: sticky;
  top: 0;
  display: flex;
  height: 100vh;
  height: 100svh;
  align-items: center;
  padding-top: 70px;
}

.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: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* 未激活的幕只是文字；激活的幕浮起成一块亚克力面板 */
.story-act {
  display: flex;
  gap: 20px;
  padding: 18px 22px;
  border-radius: var(--r-card);
  opacity: 0.42;
  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(--grain), var(--acrylic-fill);
  box-shadow: var(--acrylic-shadow);
  opacity: 1;
  transform: translateX(6px);
  -webkit-backdrop-filter: var(--acrylic-blur);
  backdrop-filter: var(--acrylic-blur);
}

.act-index {
  padding-top: 2px;
  color: var(--ink-3);
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: 0.04em;
  transition: color 0.4s ease;
}

.story-act.is-active .act-index {
  color: var(--accent-ink);
}

.act-body {
  flex: 1;
}

.act-kicker {
  margin: 0 0 4px;
  color: var(--ink-3);
  font-size: 0.78rem;
  font-weight: 650;
  letter-spacing: 0.06em;
}

.act-body h3 {
  margin-bottom: 6px;
  font-size: clamp(1.16rem, 1.8vw, 1.42rem);
  letter-spacing: -0.02em;
}

.act-body > p:not(.act-kicker) {
  margin: 0;
  color: var(--ink-2);
  font-size: 0.95rem;
}

/* 未激活的幕收起正文，只留标题，四幕才放得进一屏 */
html.js .story-act:not(.is-active) .act-body > p:not(.act-kicker),
html.js .story-act:not(.is-active) .act-bar {
  display: none;
}

/* 幕内进度条：--ap 由 site.js 写入（0 → 1）；绿色只用在这根指示线上 */
.act-bar {
  display: block;
  overflow: hidden;
  height: 2px;
  margin-top: 14px;
  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 + 背后一团呼吸的白光 */
.story-device {
  position: relative;
  display: grid;
  place-items: center;
}

.story-device::before,
.device-stage::before {
  position: absolute;
  width: 130%;
  height: 76%;
  border-radius: 50%;
  background: radial-gradient(closest-side, var(--glow-1), transparent);
  content: "";
  filter: blur(30px);
  animation: device-glow 6s ease-in-out infinite;
}

@keyframes device-glow {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.06); }
}

/* --------------------------------------------------------------------------
 * 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 var(--shadow-device)) drop-shadow(0 12px 16px rgba(8, 12, 16, 0.12));
}

.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 {
  position: relative;
  display: grid;
  margin: 0;
  place-items: center;
}

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

/* --------------------------------------------------------------------------
 * 11. 嘴替输入法：三块面板
 * -------------------------------------------------------------------------- */
.personal-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(3, 1fr);
}

.personal-card {
  display: flex;
  flex-direction: column;
  padding: 12px;
}

/* 截图本身就是一张带底色的卡片：完整显示（contain），像一张小卡片浮在面板里 */
.personal-media {
  display: grid;
  aspect-ratio: 4 / 3;
  place-items: center;
  padding: 14px;
}

.personal-media img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: drop-shadow(0 8px 14px rgba(21, 24, 26, 0.1));
  transition: transform 1.2s var(--ease-out);
}

.personal-media.is-video {
  padding: 0;
}

.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(1.03);
}

.personal-card h3 {
  margin: 20px 12px 8px;
}

.personal-card p {
  margin: 0;
  padding: 0 12px 14px;
  color: var(--ink-2);
  font-size: 0.94rem;
}

/* --------------------------------------------------------------------------
 * 12. 功能区块：技能 / 打字
 * -------------------------------------------------------------------------- */
.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(--ink-3);
}

.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 .chip {
  color: var(--ink);
  transition: transform 0.5s var(--ease-spring), box-shadow 0.25s ease;
}

.skill-chips .chip:hover {
  transform: translateY(-3px);
}

.skill-chips .i {
  width: 15px;
  height: 15px;
  color: var(--ink-3);
}

/* 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 .chip {
  opacity: 0;
}

html.js .reveal.is-visible .skill-chips .chip {
  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: 3px;
  left: 0;
  width: 16px;
  height: 16px;
  color: var(--ink-3);
  /* 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;
}

/* 数字：进入视口时滚动计数（无 JS 时直接显示最终数值） */
.stat-row {
  display: grid;
  gap: 12px;
  margin-top: 28px;
  grid-template-columns: 1fr 1fr;
}

.stat {
  padding: 18px 20px;
}

.stat strong {
  display: block;
  margin-bottom: 4px;
  font-size: clamp(1.9rem, 3.4vw, 2.5rem);
  font-variant-numeric: tabular-nums;
  font-weight: 680;
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.stat span {
  display: block;
  color: var(--ink-2);
  font-size: 0.88rem;
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
 * 13. 隐私：整页唯一的烟熏亚克力面板（含可选账号）
 * -------------------------------------------------------------------------- */
.privacy-panel {
  position: relative;
  padding: clamp(36px, 6vw, 72px) clamp(20px, 5vw, 56px) clamp(24px, 4vw, 40px);
  overflow: hidden;
  isolation: isolate;
}

/* 面板顶部一团极淡的光，像灯从上方照进烟熏亚克力 */
.privacy-panel::before {
  position: absolute;
  z-index: -1;
  top: -40%;
  left: 50%;
  width: 760px;
  height: 520px;
  margin-left: -380px;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(255, 255, 255, 0.08), transparent);
  content: "";
}

.privacy-panel .center-heading p:not(.eyebrow) {
  color: var(--smoke-ink-2);
}

.privacy-panel .eyebrow {
  color: var(--smoke-ink-2);
}

/* 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: 112px;
  height: 112px;
  margin: 0 auto 24px;
}

.device-emblem::before {
  position: absolute;
  inset: -20%;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(79, 203, 104, 0.2), 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(255, 255, 255, 0.22);
  stroke-dasharray: 2 6;
  stroke-width: 1;
}

.emblem-spin {
  fill: var(--smoke-ink-2);
  transform-origin: 80px 80px;
  animation: orbit 10s linear infinite;
}

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

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

.emblem-device {
  fill: rgba(255, 255, 255, 0.05);
  stroke: rgba(255, 255, 255, 0.4);
  stroke-width: 1.5;
}

.emblem-wave rect {
  fill: var(--smoke-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); }
}

/* 烟熏面板里的子卡片：同一种材质再叠一层，靠高光和更亮的底区分 */
.service-paths {
  display: grid;
  align-items: stretch;
  gap: 14px;
  grid-template-columns: 1.2fr 1fr 1fr;
}

.smoke-card {
  position: relative;
  padding: 26px 24px 22px;
  border-radius: calc(var(--r-panel) - 12px);
  background: rgba(255, 255, 255, 0.045);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08), 0 0 0 1px var(--smoke-line);
}

.smoke-card.is-primary {
  background: rgba(255, 255, 255, 0.075);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.14), 0 0 0 1px rgba(255, 255, 255, 0.14);
}

/* 「默认」标签：烟熏面板里唯一的绿色 */
.path-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  padding: 4px 10px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--smoke-accent) 18%, transparent);
  color: var(--smoke-accent);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.path-icon {
  width: 24px;
  height: 24px;
  margin-bottom: 16px;
  color: var(--smoke-ink-2);
}

.smoke-card h3 {
  margin-bottom: 8px;
  font-size: 1.18rem;
}

.smoke-card p {
  color: var(--smoke-ink-2);
  font-size: 0.94rem;
}

.path-note {
  display: block;
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--smoke-line);
  color: var(--smoke-ink-2);
  font-size: 0.82rem;
  letter-spacing: 0.01em;
}

/* 可选账号：并入隐私面板，标题 + 两列要点 */
.account-row {
  display: grid;
  align-items: start;
  gap: 18px 40px;
  margin-top: 14px;
  padding: 26px 28px;
  grid-template-columns: minmax(200px, 0.8fr) 2fr;
}

.account-row h3 {
  margin: 0 0 6px;
  font-size: 1.12rem;
}

.account-row > div > p {
  margin: 0;
  color: var(--smoke-ink-2);
  font-size: 0.9rem;
}

.account-row .quiet-list {
  margin: 0;
  color: var(--smoke-ink-2);
  font-size: 0.92rem;
  grid-template-columns: 1fr 1fr;
  gap: 12px 28px;
}

.account-row .quiet-list li::before {
  color: rgba(255, 255, 255, 0.4);
}

.privacy-proof {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  margin-top: 14px;
  padding: 22px 28px;
}

.privacy-proof > div {
  display: flex;
  align-items: center;
  gap: 20px;
}

/* 「0」：0 个第三方追踪 SDK，从 99 倒数到 0 */
.privacy-proof strong {
  flex: none;
  font-size: 2.6rem;
  font-variant-numeric: tabular-nums;
  font-weight: 680;
  letter-spacing: -0.04em;
  line-height: 1;
}

.privacy-proof h3 {
  margin: 0;
  color: var(--smoke-ink);
  font-size: 1rem;
  font-weight: 560;
  letter-spacing: 0;
}

/* 烟熏面板里的键帽：深色版 */
.acrylic-smoke .keycap {
  flex: none;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.06));
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.16),
    inset 0 -2px 0 rgba(0, 0, 0, 0.3),
    0 0 0 1px rgba(255, 255, 255, 0.1),
    0 8px 18px -8px rgba(0, 0, 0, 0.6);
  color: var(--smoke-ink);
}

.acrylic-smoke .keycap:active {
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.acrylic-smoke .keycap .i {
  color: var(--smoke-ink-2);
}

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

.platform-card {
  padding: 12px;
}

.platform-card .media-inset {
  aspect-ratio: 4 / 3;
}

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

.platform-card:hover .media-inset img {
  transform: scale(1.03);
}

.platform-label {
  display: block;
  margin: 22px 16px 8px;
  color: var(--ink-3);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.07em;
}

.platform-card h3 {
  margin: 0 16px 10px;
}

.platform-card > p {
  margin: 0;
  padding: 0 16px 18px;
  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;
}

/* 稳定性：一行标签，挂在平台区末尾 */
.reliability {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.reliability-title {
  margin-right: 6px;
  color: var(--ink-2);
  font-size: 0.9rem;
  font-weight: 650;
}

.reliability .chip {
  font-size: 0.82rem;
}

/* --------------------------------------------------------------------------
 * 15. FAQ：居中单栏（展开高度由 site.js 用 Web Animations 过渡）
 * -------------------------------------------------------------------------- */
.faq-list {
  max-width: 780px;
  margin: 0 auto;
  padding: 8px 28px;
}

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

.faq-item:first-child {
  border-top: 0;
}

.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(--ink-2);
}

.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; }
}

/* --------------------------------------------------------------------------
 * 16. 下载：一块大亚克力面板，与首屏的图标键帽首尾呼应
 * -------------------------------------------------------------------------- */
.download-section {
  padding-top: 0;
}

.download-panel {
  position: relative;
  display: flex;
  overflow: hidden;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  padding: clamp(36px, 6vw, 72px);
  border-radius: var(--r-panel);
  isolation: isolate;
}

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

.download-backdrop .aurora-a {
  top: -70%;
  left: -14%;
  width: 520px;
  height: 520px;
}

.download-backdrop .aurora-b {
  top: auto;
  right: -16%;
  bottom: -80%;
  width: 520px;
  height: 520px;
}

/* 声波路径：虚线沿曲线流动，两条反向错速；中性色 */
.download-wave {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 55%;
  opacity: 0.5;
}

.download-wave path {
  fill: none;
  stroke: var(--line-strong);
  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: 0.6;
  animation-direction: reverse;
  animation-duration: 8s;
}

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

.download-mark {
  width: 64px;
  height: 64px;
  margin-bottom: 22px;
  filter: drop-shadow(0 10px 14px rgba(21, 24, 26, 0.16));
}

.download-copy h2 {
  margin-bottom: 12px;
  font-size: clamp(1.9rem, 4vw, 2.9rem);
}

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

.download-actions {
  display: flex;
  flex: none;
  flex-direction: column;
  align-items: stretch;
  gap: 12px;
}

/* --------------------------------------------------------------------------
 * 17. 页脚
 * -------------------------------------------------------------------------- */
.site-footer {
  padding: 40px 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);
}

/* --------------------------------------------------------------------------
 * 18. 动效系统：滚动显现 / 遮罩揭示 / 亚克力反光 / 磁吸 / 主题过渡
 * -------------------------------------------------------------------------- */
/*
 * 进场只动 opacity + translate（独立属性），把 transform 留给悬停与视差，
 * 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, var(--d, 0s);
  transition-duration: 0.9s, 1.05s, 0.5s, 0.35s, 1.25s;
  transition-property: opacity, translate, transform, box-shadow, clip-path;
  transition-timing-function: ease-out, var(--ease-out), var(--ease-out), 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, 1.25s;
}

/* 遮罩揭示：画面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(--r-card));
}

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

/*
 * 亚克力反光：指针所在处一块柔和高光 + 边缘描光，像灯光照在亚克力上。
 * --mx / --my 由脚本写入；反光颜色由 --sheen / --sheen-edge 决定，随主题与材质变化。
 */
.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(
    380px circle at var(--mx, 50%) var(--my, 50%),
    var(--sheen),
    transparent 55%
  );
}

.spot::after {
  z-index: 2;
  padding: 1px;
  background: radial-gradient(
    240px circle at var(--mx, 50%) var(--my, 50%),
    var(--sheen-edge),
    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;
}

/* 可悬停的面板：轻微浮起 */
.lift {
  transition: transform 0.5s var(--ease-out), box-shadow 0.35s ease;
}

.lift:hover {
  transform: translateY(-4px);
}

/* 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;
}

/* --------------------------------------------------------------------------
 * 19. 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 .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;
  }

  .lift:hover {
    transform: none;
  }
}

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

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

  /* 移动端菜单：导航条下方再悬浮一块亚克力面板 */
  .mobile-nav {
    display: block;
    width: var(--content);
    margin: 8px auto 0;
    padding: 8px;
    border-radius: 18px;
    background: var(--grain), var(--acrylic-fill);
    box-shadow: var(--acrylic-shadow);
    pointer-events: auto;
    -webkit-backdrop-filter: var(--acrylic-blur);
    backdrop-filter: var(--acrylic-blur);
  }

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

  .mobile-nav a {
    display: block;
    padding: 12px 14px;
    border-radius: var(--r-chip);
    font-size: 1rem;
  }

  .mobile-nav a:active {
    background: var(--line);
  }

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

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

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

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

  .account-row {
    grid-template-columns: 1fr;
  }

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

  .download-actions {
    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: 480vh;
  }

  .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 - 32px);
  }

  .hero {
    padding-top: 112px;
  }

  .hero-mark {
    width: 80px;
    height: 80px;
  }

  /* 窄屏：商店徽章独占一行，两枚键帽平分下一行，避免二加一的参差 */
  .hero-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .hero-actions .store-badge {
    grid-column: 1 / -1;
    justify-self: center;
  }

  .hero-actions .keycap {
    padding-inline: 12px;
  }

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

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

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

  .account-row .quiet-list {
    grid-template-columns: 1fr;
  }

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

  .faq-list {
    padding: 4px 20px;
  }

  .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 520vh 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;
}