:root {
  color-scheme: light;
  --paper: #f7f7f4;
  --paper-strong: #ffffff;
  --ink: #18181b;
  --muted: #64646b;
  --line: rgba(24, 24, 27, 0.14);
  --line-strong: rgba(24, 24, 27, 0.28);
  --night: #15161a;
  --night-raised: #222329;
  /* 键帽：浅色卡片上的一颗实体按键 */
  --key-cap: #2a2b31;
  /* 键帽上的两种强调色，和状态色同源 */
  --key-send: #5ed289;
  --key-send-ink: #0c3a20;
  /* 提示块的蓝色浅底 */
  --blue-tint: #eef3ff;
  --night-text: #f7f7f4;
  --blue: #1769ff;
  --blue-deep: #0d47bd;
  --red: #ee3f45;
  --green: #2da95f;
  /* 字阶：1.25 模数。全站只用这五级 —— 之前有 18 种字号/字重组合，
     其中正文占了 15/16/17/18/19/20px 六种。相差 1px 不构成层级，
     只让页面读起来"没对齐"。 */
  --text-display: clamp(38px, 6.4vw, 64px);   /* 首屏主标题 */
  --text-title: clamp(27px, 3.4vw, 40px);     /* 区块标题 */
  --text-lead: clamp(18px, 1.6vw, 20px);      /* 区块导语、卡片标题 */
  --text-body: 17px;      /* 正文 */
  --text-meta: 14px;      /* 标签、注释、次要信息 */
  --header-height: 72px;
  --shell: min(1180px, calc(100vw - 48px));
  --shadow: 0 24px 80px rgba(8, 10, 18, 0.22), 0 4px 18px rgba(8, 10, 18, 0.12);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Helvetica Neue", sans-serif;
  font-synthesis: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
}

body {
  margin: 0;
  min-width: 320px;
  /* 没有显式字号的元素原来落在浏览器默认的 16px 上，和正文的 17px 差一格，
     页面里因此一直混着两种正文。基线并进字阶。 */
  font-size: var(--text-body);
  line-height: 1.7;
  color: var(--ink);
  background: var(--paper);
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
}

body.nav-open {
  overflow: hidden;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

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

button,
summary {
  font: inherit;
}

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

:focus-visible {
  outline: 3px solid rgba(23, 105, 255, 0.45);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  color: var(--ink);
  background: var(--paper);
  transform: translateY(-160%);
}

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

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

/* 节奏分三档。原来 10 个区块全是 124px 上下留白 —— 完全均匀等于没有轻重，
   读者拿不到"哪里是重点、哪里是过渡"的信号。 */
.section-pad {
  padding: 104px 0;
}

/* 转折处拉开：进入论述、进入行动召唤 */
.problem,
.download {
  padding: 140px 0;
}

/* 相关的靠近：产品界面是工作流的另一种讲法，让它跟得紧一些 */
.product {
  padding-top: 72px;
}

/* 标题行长统一。原来从 283px 到 860px 都有，折行位置完全不受控。
   用 em 不用 ch：ch 按 "0" 的宽度算，一个汉字约合两个 ch，
   拿 ch 限宽会把中文标题挤成一半长度。 */
.section-heading h2,
.section-heading > div > h2 {
  max-width: 14em;
}


.section-heading > p,
.section-heading > div + p {
  max-width: 30em;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--blue);
  font-size: var(--text-meta);
  font-weight: 720;
  line-height: 1.35;
  text-transform: uppercase;
}

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

h1,
h2,
h3 {
  letter-spacing: 0;
}

h2 {
  max-width: 860px;
  margin-bottom: 22px;
  font-size: var(--text-display);
  font-weight: 680;
  line-height: 1.05;
}

.section-heading {
  margin-bottom: 64px;
}

.section-heading > p:last-child {
  max-width: 620px;
  margin: 0;
  color: var(--muted);
  font-size: var(--text-body);
  line-height: 1.75;
}

.section-heading-row {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(260px, 0.6fr);
  align-items: end;
  gap: 64px;
}

.section-heading-row h2 {
  margin-bottom: 0;
}

.section-heading-row > p {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: var(--text-body);
  line-height: 1.7;
}

.button {
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 7px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-size: var(--text-meta);
  font-weight: 680;
  line-height: 1;
  cursor: pointer;
  transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: white;
  background: var(--blue);
}

.button-primary:hover {
  background: var(--blue-deep);
}

.button-quiet {
  color: var(--ink);
  border-color: var(--line-strong);
  background: rgba(255, 255, 255, 0.48);
}

.button-outline {
  color: white;
  border-color: rgba(255, 255, 255, 0.36);
  background: transparent;
}

.button-light {
  color: var(--ink);
  background: white;
}

.button-light:hover {
  background: var(--paper);
}

.icon-button {
  width: 42px;
  height: 42px;
  padding: 0;
  border: 0;
  border-radius: 6px;
  display: grid;
  place-items: center;
  color: inherit;
  background: transparent;
  cursor: pointer;
}

.site-header {
  position: fixed;
  z-index: 40;
  inset: 0 0 auto;
  height: var(--header-height);
  padding: 0 max(24px, calc((100vw - 1320px) / 2));
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 40px;
  color: var(--ink);
  background: rgba(247, 247, 244, 0.88);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(20px) saturate(150%);
  transition: border-color 180ms ease, background-color 180ms ease;
}

.site-header.is-scrolled {
  border-color: var(--line);
  background: rgba(247, 247, 244, 0.96);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-size: var(--text-body);
  font-weight: 740;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 9px;
}

.site-nav {
  justify-self: center;
  display: flex;
  align-items: center;
  gap: 30px;
}

.site-nav a {
  color: #424249;
  font-size: var(--text-meta);
  font-weight: 560;
  transition: color 150ms ease;
}

.site-nav a:hover {
  color: var(--blue);
}

.header-cta {
  min-height: 38px;
  padding: 0 16px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  color: white;
  background: var(--ink);
  font-size: var(--text-meta);
  font-weight: 680;
}

.nav-toggle {
  display: none;
}

.hero {
  position: relative;
  min-height: max(720px, calc(100svh - 36px));
  padding: calc(var(--header-height) + 68px) max(24px, calc((100vw - 1320px) / 2)) 76px;
  display: grid;
  grid-template-columns: minmax(440px, 0.86fr) minmax(540px, 1.14fr);
  align-items: center;
  gap: 40px;
  overflow: hidden;
  background: var(--paper);
}

.hero::before {
  content: "";
  position: absolute;
  top: 20%;
  right: 0;
  width: 44%;
  height: 58%;
  border: 1px solid rgba(23, 105, 255, 0.2);
  border-right: 0;
  pointer-events: none;
}

.hero-copy {
  position: relative;
  z-index: 3;
  padding-bottom: 38px;
}

.hero h1 {
  max-width: 700px;
  margin: 0 0 30px;
  font-size: var(--text-display);
  font-weight: 710;
  line-height: 0.94;
}

.hero-lead {
  max-width: 610px;
  margin-bottom: 34px;
  color: #505058;
  font-size: var(--text-lead);
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-note {
  margin: 19px 0 0;
  color: #727278;
  font-size: var(--text-meta);
  line-height: 1.5;
}

.hero-media {
  position: relative;
  z-index: 2;
  min-width: 0;
  height: min(630px, calc(100svh - 150px));
  align-self: end;
}

.hero-window {
  position: absolute;
  z-index: 1;
  top: 2%;
  left: 0;
  width: min(760px, 58vw);
  max-width: none;
  border-radius: 17px;
  box-shadow: var(--shadow);
}

.hero-controllers {
  position: absolute;
  z-index: 2;
  right: -12%;
  bottom: -4%;
  width: min(630px, 50vw);
  max-width: none;
  filter: drop-shadow(0 32px 32px rgba(5, 7, 15, 0.28));
  transform: rotate(-4deg);
}

.hero-scroll {
  position: absolute;
  z-index: 3;
  bottom: 28px;
  left: max(24px, calc((100vw - 1320px) / 2));
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: var(--text-meta);
  font-weight: 650;
}

.promise {
  min-height: 116px;
  padding: 24px max(24px, calc((100vw - 1320px) / 2));
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  align-items: stretch;
  color: var(--ink);
  background: var(--paper-strong);
}

.promise p {
  margin: 0;
  padding: 4px 34px;
  border-left: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 7px;
}

.promise p:first-child {
  padding-left: 0;
  border-left: 0;
}

.promise strong {
  font-size: var(--text-body);
}

.promise span {
  color: var(--muted);
  font-size: var(--text-meta);
  line-height: 1.5;
}

.problem {
  background: var(--paper);
}

.problem-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1fr);
  gap: 72px;
  align-items: start;
}

.problem h2 {
  margin-bottom: 0;
}

.problem-detail {
  padding-top: 16px;
  max-width: 620px;
}

.problem-detail p {
  color: var(--muted);
  font-size: var(--text-lead);
  line-height: 1.75;
}

.problem-detail p:last-child {
  margin-bottom: 0;
  color: var(--ink);
}

.problem-detail .definition-copy {
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
  color: var(--ink);
}

.definition-copy strong {
  display: block;
}

.workflow {
  color: var(--ink);
  background: var(--paper-strong);
}

.workflow .eyebrow {
  color: var(--blue);
}

.workflow .section-heading > p:last-child {
  color: var(--muted);
}

.workflow-track {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: stretch;
  gap: 18px;
}

.workflow-step {
  min-height: 300px;
  padding: 34px;
  border: 1px solid var(--line);
  border-radius: 8px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: var(--paper);
}

.workflow-key {
  width: 78px;
  height: 78px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: white;
  background: var(--key-cap);
  box-shadow: inset 0 -7px 12px rgba(0, 0, 0, 0.3), inset 0 2px 4px rgba(255, 255, 255, 0.24);
  font-size: var(--text-lead);
  font-weight: 760;
}

.key-trigger {
  border: 2px solid #6f9fff;
}

.key-plus {
  border: 2px solid #ff767a;
}

.key-send {
  color: white;
  background: var(--key-cap);
  border: 2px solid #6f9fff;
}

.step-meta {
  margin: 0 0 12px;
  color: #8db5ff;
  font-size: var(--text-meta);
  font-weight: 700;
}

.workflow-step h3 {
  margin-bottom: 12px;
  font-size: var(--text-lead);
  line-height: 1.2;
}

.workflow-step p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: var(--text-meta);
  line-height: 1.7;
}

.workflow-arrow {
  align-self: center;
  color: var(--line-strong);
  font-size: var(--text-lead);
}

.product {
  background: var(--paper);
}

.product-viewer {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 44px;
  align-items: start;
}

.product-tabs {
  display: grid;
  gap: 2px;
  position: sticky;
  top: calc(var(--header-height) + 30px);
}

.product-tabs button {
  min-height: 64px;
  padding: 0 14px;
  border: 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 34px 1fr;
  align-items: center;
  gap: 6px;
  color: var(--muted);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.product-tabs button:last-child {
  border-bottom: 1px solid var(--line);
}

.product-tabs button[aria-selected="true"] {
  color: var(--ink);
  background: white;
  box-shadow: inset 3px 0 var(--blue);
}

.product-tabs span {
  color: var(--blue);
  font-size: var(--text-meta);
  font-weight: 720;
}

.product-panel {
  min-width: 0;
  margin: 0;
}

.product-panel img {
  width: 100%;
  border-radius: 16px;
  box-shadow: 0 18px 60px rgba(29, 32, 42, 0.18);
  background: var(--night-raised);
  aspect-ratio: 1180 / 780;
  object-fit: cover;
}

.product-panel.is-changing img {
  opacity: 0.25;
  transform: translateY(4px);
}

.product-panel img {
  transition: opacity 170ms ease, transform 170ms ease;
}

.product-panel figcaption {
  padding: 22px 2px 0;
  display: grid;
  grid-template-columns: minmax(210px, 0.45fr) 1fr;
  gap: 32px;
}

.product-panel strong {
  font-size: var(--text-body);
}

.product-panel span {
  color: var(--muted);
  font-size: var(--text-meta);
  line-height: 1.65;
}

.benefits {
  background: var(--paper-strong);
}

.benefit-grid {
  min-height: 640px;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  grid-template-rows: 1fr 1fr;
  gap: 16px;
}

.benefit-item {
  position: relative;
  min-height: 280px;
  padding: 40px;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--paper);
}

.benefit-item-large {
  grid-row: 1 / 3;
  min-height: 640px;
  color: white;
  background: var(--blue);
}

.benefit-item-dark {
  color: var(--ink);
  background: var(--paper);
}

.benefit-index {
  color: currentColor;
  opacity: 0.58;
  font-size: var(--text-meta);
  font-weight: 760;
}

.benefit-item h3 {
  max-width: 520px;
  margin: 30px 0 16px;
  font-size: var(--text-title);
  line-height: 1.08;
}

.benefit-item p {
  position: relative;
  z-index: 2;
  max-width: 520px;
  margin: 0;
  color: var(--muted);
  font-size: var(--text-body);
  line-height: 1.7;
}

.benefit-item-large p,
.benefit-item-dark p {
  color: rgba(255, 255, 255, 0.72);
}

.benefit-item-large img {
  position: absolute;
  right: -4%;
  bottom: -30%;
  width: 54%;
  max-width: 330px;
  transform: rotate(12deg);
  filter: drop-shadow(0 28px 28px rgba(0, 0, 0, 0.28));
}

.scenes {
  background: var(--paper);
}

/* 标题跨整行、内容在下 —— 原来标题挤在 330px 的窄列里，
   「只要你习惯开口表达，它就有用。」被断成三行。 */
.scenes-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

.scenes-heading {
  max-width: 32em;
}

.scenes-heading {
  position: relative;
  top: auto;
  align-self: start;
  margin-bottom: 0;
}

.scenes-heading h2 {
  font-size: var(--text-display);
}

.scene-list {
  border-top: 1px solid var(--line-strong);
}

.scene-list article {
  min-height: 210px;
  padding: 36px 0;
  border-bottom: 1px solid var(--line-strong);
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 28px;
}

.scene-list > article > span {
  color: var(--blue);
  font-size: var(--text-meta);
  font-weight: 720;
}

.scene-list h3 {
  margin-bottom: 14px;
  font-size: var(--text-title);
  line-height: 1.15;
}

.scene-list p {
  max-width: 560px;
  margin: 0;
  color: var(--muted);
  font-size: var(--text-body);
  line-height: 1.7;
}

.privacy {
  color: var(--ink);
  background: var(--paper-strong);
}

.privacy-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 70px;
  align-items: center;
}

.privacy-mark {
  width: 200px;
  aspect-ratio: 1;
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
}

.privacy-mark img {
  border-radius: 24px;
}

.privacy .eyebrow {
  color: var(--blue);
}

.privacy h2 {
  max-width: 930px;
}

.privacy-layout > div:last-child > p:last-child {
  max-width: 780px;
  margin: 0;
  color: var(--muted);
  font-size: var(--text-body);
  line-height: 1.75;
}

.setup {
  background: var(--paper);
}

.setup-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.setup-list li {
  min-height: 170px;
  padding: 34px 0;
  border-bottom: 1px solid var(--line-strong);
  display: grid;
  grid-template-columns: 110px 1fr;
  align-items: start;
  gap: 38px;
}

.setup-list > li > span {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: white;
  background: var(--ink);
  font-size: var(--text-body);
  font-weight: 700;
}

.setup-list h3 {
  margin-bottom: 10px;
  font-size: var(--text-title);
}

.setup-list p {
  max-width: 720px;
  margin: 0;
  color: var(--muted);
  font-size: var(--text-body);
  line-height: 1.7;
}

.download {
  color: white;
  background: var(--night);
}

.download-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 90px;
  align-items: center;
}

.download .eyebrow {
  color: #89b3ff;
}

.download h2 {
  max-width: 780px;
}

.download-lead {
  max-width: 680px;
  margin-bottom: 32px;
  color: #b8b8c1;
  font-size: var(--text-body);
  line-height: 1.72;
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.download-note {
  margin-top: 18px;
  max-width: 46ch;
  font-size: var(--text-meta);
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.62);
}


.download-product {
  padding: 42px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: var(--night-raised);
}

.download-product img {
  width: 110px;
  height: 110px;
  margin-bottom: 40px;
  border-radius: 24px;
}

.download-product dl {
  margin: 0;
}

.download-product dl > div {
  padding: 16px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  display: grid;
  grid-template-columns: 82px 1fr;
  gap: 20px;
}

.download-product dt {
  color: #8f8f99;
  font-size: var(--text-meta);
}

.download-product dd {
  margin: 0;
  font-size: var(--text-meta);
}

.requirements {
  background: var(--paper-strong);
}

/* 同上：「你需要这些。」六个字原来也能断成两行。 */
.requirements-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.requirements h2 {
  margin: 0;
}

.requirements ul {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-strong);
  list-style: none;
}

.requirements li {
  min-height: 92px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-strong);
  display: grid;
  grid-template-columns: minmax(170px, 0.45fr) 1fr;
  align-items: center;
  gap: 30px;
}

.requirements strong {
  font-size: var(--text-body);
}

.requirements span {
  color: var(--muted);
  font-size: var(--text-meta);
  line-height: 1.6;
}

.faq {
  background: var(--paper);
}

.faq-layout {
  display: grid;
  grid-template-columns: minmax(280px, 0.64fr) minmax(520px, 1.36fr);
  gap: 100px;
}

.faq-heading h2 {
  font-size: var(--text-display);
}

.faq-list {
  border-top: 1px solid var(--line-strong);
}

.faq-list details {
  border-bottom: 1px solid var(--line-strong);
}

.faq-list summary {
  position: relative;
  min-height: 86px;
  padding: 26px 54px 26px 0;
  display: flex;
  align-items: center;
  font-size: var(--text-body);
  font-weight: 650;
  cursor: pointer;
  list-style: none;
}

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

.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  color: var(--muted);
  transform: translateY(-50%);
  transition: transform 150ms ease;
}

.faq-list details[open] summary::after {
  transform: translateY(-50%) rotate(45deg);
}

.faq-list details p {
  max-width: 700px;
  margin: -8px 54px 28px 0;
  color: var(--muted);
  font-size: var(--text-meta);
  line-height: 1.72;
}

.site-footer {
  padding: 72px max(24px, calc((100vw - 1320px) / 2)) 28px;
  color: white;
  background: var(--night);
}

/* 品牌和那句话是一件事，放在一起；链接成行排在右侧。
   原来是 1fr 1fr auto 三栏：标语被挤在中间孤零零一列，链接竖着贴右边缘，
   中间空一大片。三块东西互相没有关系，看着就是散的。 */
.footer-main {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 32px 56px;
}

.footer-main > .footer-brand {
  margin-bottom: 10px;
}

.footer-identity {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.footer-identity p {
  margin: 0;
  color: #9a9aa4;
  font-size: var(--text-meta);
}

.footer-main nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 12px 26px;
}

.footer-main nav a {
  color: #c8c8cf;
  font-size: var(--text-meta);
  text-decoration: none;
  transition: color 0.15s ease;
}

.footer-main nav a:hover {
  color: white;
}

.footer-brand {
  font-size: var(--text-body);
}



.footer-meta {
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  display: flex;
  justify-content: space-between;
  gap: 24px;
  color: #76767f;
  font-size: var(--text-meta);
}

.release-dialog {
  width: min(520px, calc(100vw - 32px));
  padding: 0;
  border: 0;
  border-radius: 8px;
  color: var(--ink);
  background: white;
  box-shadow: var(--shadow);
}

.release-dialog::backdrop {
  background: rgba(9, 10, 14, 0.62);
  backdrop-filter: blur(8px);
}

.release-dialog form {
  position: relative;
  padding: 46px;
}

.release-dialog form > img {
  margin-bottom: 24px;
  border-radius: 16px;
}

.release-dialog h2 {
  margin-bottom: 18px;
  font-size: var(--text-title);
  line-height: 1.08;
}

.info-main {
  padding-top: var(--header-height);
  background: var(--paper-strong);
}

.info-hero {
  min-height: 520px;
  padding: 110px 0 80px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.info-hero h1 {
  max-width: 980px;
  margin: 0 0 28px;
  font-size: var(--text-display);
  font-weight: 700;
  line-height: 0.98;
}

.info-hero > p:last-child {
  max-width: 740px;
  margin: 0;
  color: var(--muted);
  font-size: var(--text-lead);
  line-height: 1.72;
}

.info-body {
  padding: 0 0 120px;
  display: grid;
  grid-template-columns: 220px minmax(0, 760px);
  justify-content: space-between;
  gap: 80px;
}

.info-toc {
  position: sticky;
  top: calc(var(--header-height) + 36px);
  align-self: start;
  padding-top: 22px;
  border-top: 2px solid var(--ink);
  display: grid;
  gap: 0;
}

.info-toc strong {
  margin-bottom: 16px;
  font-size: var(--text-meta);
}

.info-toc a {
  min-height: 38px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  color: var(--muted);
  font-size: var(--text-meta);
}

.info-toc a:hover {
  color: var(--blue);
}

.info-content > section {
  padding: 76px 0;
  border-top: 1px solid var(--line-strong);
}

.info-content > section:first-child {
  border-top: 2px solid var(--ink);
}

.info-content h2 {
  margin-bottom: 24px;
  font-size: var(--text-title);
  line-height: 1.08;
}

.info-content h3 {
  margin-bottom: 16px;
  font-size: var(--text-lead);
}

.info-content p,
.info-content li {
  color: #505058;
  font-size: var(--text-body);
  line-height: 1.78;
}

.info-content ol,
.info-content ul {
  padding-left: 24px;
}

.info-content li + li {
  margin-top: 10px;
}

.info-step-label {
  margin-bottom: 14px;
  color: var(--blue) !important;
  font-size: var(--text-meta) !important;
  font-weight: 740;
  text-transform: uppercase;
}

.check-list {
  margin: 26px 0 0;
  padding: 0 !important;
  list-style: none;
}

.check-list li {
  position: relative;
  padding: 14px 0 14px 34px;
  border-bottom: 1px solid var(--line);
}

.check-list li::before {
  content: "✓";
  position: absolute;
  left: 2px;
  color: var(--green);
  font-weight: 760;
}

.fact-table {
  margin: 30px 0;
  border-top: 1px solid var(--line-strong);
}

.fact-table > div {
  min-height: 72px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: minmax(140px, 0.42fr) 1fr;
  align-items: center;
  gap: 24px;
}

.fact-table strong {
  color: var(--ink);
  font-size: var(--text-meta);
}

.fact-table span {
  color: var(--muted);
  font-size: var(--text-meta);
  line-height: 1.6;
}

kbd {
  min-width: 25px;
  min-height: 23px;
  padding: 2px 7px;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: 5px;
  display: inline-grid;
  place-items: center;
  color: var(--ink);
  background: var(--paper);
  font: 600 13px/1 -apple-system, BlinkMacSystemFont, sans-serif;
}

.info-figure {
  margin: 44px 0 0;
}

.info-figure img {
  width: 100%;
  border-radius: 10px;
  box-shadow: 0 16px 48px rgba(16, 18, 26, 0.14);
}

.info-figure figcaption {
  margin-top: 13px;
  color: var(--muted);
  font-size: var(--text-meta);
  line-height: 1.55;
}

.callout {
  margin: 30px 0;
  padding: 22px 24px;
  border-left: 3px solid var(--blue);
  color: var(--ink) !important;
  background: var(--blue-tint);
}

.info-complete {
  padding: 58px !important;
  border: 0 !important;
  color: white;
  background: var(--night);
}

.info-complete h2 {
  color: white;
}

.info-complete .check-list li {
  color: #c1c1c9;
  border-color: rgba(255, 255, 255, 0.14);
}

.info-actions {
  margin-top: 34px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.compact-footer .footer-main {
  min-height: 140px;
}







.not-found-page {
  min-height: 100svh;
  display: grid;
  place-items: center;
  background: var(--paper);
}

.not-found-page main {
  width: min(680px, calc(100vw - 32px));
  text-align: center;
}

.not-found-page main > img {
  margin: 0 auto 28px;
  border-radius: 20px;
}

.not-found-page h1 {
  margin-bottom: 18px;
  font-size: var(--text-display);
  line-height: 1;
}

.not-found-page main > p:not(.eyebrow) {
  margin-bottom: 30px;
  color: var(--muted);
  font-size: var(--text-body);
}

.release-dialog form > p:not(.eyebrow) {
  margin-bottom: 28px;
  color: var(--muted);
  font-size: var(--text-meta);
  line-height: 1.72;
}

.dialog-close {
  position: absolute;
  top: 12px;
  right: 12px;
  font-size: var(--text-lead);
  font-weight: 300;
}

@media (max-width: 1100px) {
  :root {
    --shell: min(100% - 40px, 940px);
  }

  .site-header {
    padding-inline: 20px;
  }

  .site-nav {
    gap: 20px;
  }

  .hero {
    min-height: max(720px, calc(100svh - 36px));
    padding-inline: 28px;
    grid-template-columns: minmax(340px, 0.8fr) minmax(0, 1.2fr);
    align-items: center;
  }

  .hero-copy {
    max-width: 520px;
    padding-top: 0;
  }

  .hero h1 {
    font-size: var(--text-display);
  }

  .hero-media {
    position: relative;
    right: auto;
    bottom: auto;
    width: auto;
    height: 490px;
  }

  .hero-window {
    width: 720px;
  }

  .hero-controllers {
    right: -12%;
    width: 410px;
  }

  .problem-layout,
  .scenes-layout,
  .faq-layout {
    gap: 56px;
  }

  .workflow-track {
    grid-template-columns: 1fr;
  }

  .workflow-step {
    min-height: 250px;
  }

  .workflow-arrow {
    transform: rotate(90deg);
  }

  .privacy-layout {
    grid-template-columns: 170px 1fr;
    gap: 48px;
  }

  .privacy-mark {
    width: 160px;
  }
}

@media (max-width: 820px) {
  :root {
    --header-height: 64px;
    --shell: calc(100% - 32px);
  }

  .section-pad {
    padding: 86px 0;
  }

  h2 {
    font-size: var(--text-title);
  }

  .section-heading,
  .section-heading-row {
    margin-bottom: 44px;
  }

  .section-heading-row {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .site-header {
    grid-template-columns: 1fr auto;
  }

  .header-cta {
    display: none;
  }

  .nav-toggle {
    display: grid;
  }

  .nav-toggle span {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 1.5px;
    background: currentColor;
    transition: transform 160ms ease;
  }

  .nav-toggle span:first-child {
    transform: translate(-50%, calc(-50% - 4px));
  }

  .nav-toggle span:last-child {
    transform: translate(-50%, calc(-50% + 4px));
  }

  .nav-toggle[aria-expanded="true"] span:first-child {
    transform: translate(-50%, -50%) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] span:last-child {
    transform: translate(-50%, -50%) rotate(-45deg);
  }

  .site-nav {
    position: fixed;
    z-index: 39;
    inset: var(--header-height) 0 auto;
    width: 100%;
    height: calc(100svh - var(--header-height));
    padding: 40px 20px;
    display: none;
    align-content: start;
    justify-self: stretch;
    background: var(--paper);
  }

  .site-nav.is-open {
    display: grid;
    gap: 0;
  }

  .site-nav a {
    min-height: 62px;
    border-bottom: 1px solid var(--line);
    display: flex;
    align-items: center;
    font-size: var(--text-lead);
  }

  .hero {
    min-height: calc(100svh - 32px);
    padding: calc(var(--header-height) + 42px) 16px 54px;
    display: block;
  }

  .hero::before {
    top: auto;
    bottom: 0;
    width: 82%;
    height: 45%;
  }

  .hero h1 {
    margin-bottom: 24px;
    font-size: var(--text-display);
  }

  .hero-lead {
    font-size: var(--text-body);
  }

  .hero-note {
    max-width: 310px;
  }

  .hero-media {
    right: 0;
    bottom: 0;
    width: 100%;
    height: 250px;
  }

  .hero-window {
    top: 18px;
    left: 14%;
    width: 620px;
    border-radius: 11px;
  }

  .hero-controllers {
    right: -2%;
    bottom: -2%;
    width: 180px;
  }

  .hero-scroll {
    display: none;
  }

  .promise {
    padding: 14px 16px;
    grid-template-columns: 1fr;
  }

  .promise p,
  .promise p:first-child {
    min-height: 86px;
    padding: 16px 4px;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .promise p:first-child {
    border-top: 0;
  }

  .problem-layout,
  .scenes-layout,
  .privacy-layout,
  .download-layout,
  .requirements-layout,
  .faq-layout {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .problem-detail {
    padding-top: 0;
  }

  .problem-detail p {
    font-size: var(--text-body);
  }

  .workflow-step {
    min-height: 290px;
    padding: 28px;
  }

  .product-viewer {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .product-tabs {
    position: static;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    overflow: hidden;
  }

  .product-tabs button {
    min-height: 70px;
    padding: 10px 8px;
    border: 0;
    border-left: 1px solid var(--line);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 5px;
    white-space: normal;
  }

  .product-tabs button:first-child {
    border-left: 0;
  }

  .product-tabs button:last-child {
    border-bottom: 0;
  }

  .product-tabs button[aria-selected="true"] {
    box-shadow: inset 0 3px var(--blue);
  }

  .product-panel img {
    border-radius: 9px;
  }

  .product-panel figcaption {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .benefit-grid {
    min-height: 0;
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }

  .benefit-item,
  .benefit-item-large {
    grid-row: auto;
    min-height: 380px;
    padding: 30px;
  }

  .benefit-item-large {
    min-height: 580px;
  }

  .benefit-item-large img {
    right: 2%;
    bottom: -24%;
    width: 55%;
  }

  .scenes-heading {
    position: static;
  }

  .privacy-mark {
    width: 150px;
  }

  .setup-list li {
    grid-template-columns: 64px 1fr;
    gap: 20px;
  }

  .download-product {
    padding: 30px;
  }

  .requirements li {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .footer-main {
    flex-direction: column;
    align-items: flex-start;
    gap: 24px;
  }

  .footer-meta {
    flex-direction: column;
  }

  .release-dialog form {
    padding: 36px 24px 28px;
  }

  .info-hero {
    min-height: 420px;
    padding: 82px 0 60px;
  }

  .info-hero h1 {
    font-size: var(--text-title);
  }

  .info-hero > p:last-child {
    font-size: var(--text-body);
  }

  .info-body {
    padding-bottom: 84px;
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .info-toc {
    position: static;
  }

  .info-content > section {
    padding: 58px 0;
  }

  .info-complete {
    padding: 34px 24px !important;
  }

  .fact-table > div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .info-actions .button {
    width: 100%;
  }
}

@media (max-width: 460px) {
  .hero {
    min-height: calc(100svh - 32px);
  }

  .hero-actions {
    align-items: stretch;
  }

  .hero-actions .button {
    width: 100%;
  }

  .hero-media {
    right: 0;
    width: 100%;
    height: 210px;
  }

  .hero-window {
    left: 9%;
    width: 540px;
  }

  .hero-controllers {
    right: -8%;
    width: 160px;
  }

  .product-tabs button {
    font-size: var(--text-meta);
  }

  .scene-list article {
    grid-template-columns: 36px 1fr;
    gap: 14px;
  }

  .setup-list li {
    grid-template-columns: 1fr;
  }

  .download-actions .button {
    width: 100%;
  }
}

@media (max-width: 360px) {
  .hero {
    padding-top: calc(var(--header-height) + 22px);
    padding-bottom: 28px;
  }

  .hero h1 {
    font-size: var(--text-title);
  }

  .hero-lead {
    font-size: var(--text-meta);
  }

  .hero-note {
    font-size: var(--text-meta);
  }

  .hero-window {
    left: 5%;
  }

  .hero-media {
    height: 100px;
  }

  .hero-controllers {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* Homepage refinement: keep media fully visible and let the copy breathe. */
.hero-media { overflow: visible; }
.benefit-item-large { border-color: rgba(23,105,255,.28); }
.benefit-item-large img { opacity: .9; }
@media (max-width: 820px) { .hero-window { left: 4%; width: 92%; object-fit: contain; } .hero-media { height: 210px; } .problem-layout { gap: 34px; } .problem-copy { padding-bottom: 8px; } }
@media (max-width: 360px) { .hero-media { height: 100px; } }
/* Keep section headings on one intentional line where the sentence is short enough. */
.problem h2,
.product h2,
.benefits h2,
.scenes h2,
.privacy h2,
.setup h2,
.requirements h2,
.faq h2,
.download h2 {
  max-width: none;
  font-size: var(--text-title);
  line-height: 1.12;
}
.scenes-heading { max-width: none; }
@media (min-width: 821px) {
  .scenes-heading h2 { white-space: nowrap; }
}

/* 这几行曾经是 white-space: nowrap。
 *
 * 意图是"标题别断在奇怪的地方"，但 nowrap 不会让文字缩，只会让它溢出：
 * 首屏两栏布局下，左栏在 1024px 视口只有 365px 宽，而标题需要 704px，
 * 于是 339px 的字直接画到了右边的产品截图上。因为溢出的是字形、不是盒子，
 * 元素的 getBoundingClientRect 完全正常，遮挡检查也就查不出来。
 *
 * 换成给一个够宽的 measure：放得下就是一行，放不下就正常折行。
 * scripts/validate-site.js 里现在有一条断言专门盯着"文字画出盒子外"。 */
.hero h1 { text-wrap: balance; }
@media (min-width: 821px) {
  .hero h1 { max-width: 740px; }
  .hero-note { white-space: nowrap; }
}
/* 首屏两栏之间这一段，左栏只有约 365px，而 --text-display 到 1024px 就顶到
 * 64px 上限 —— 一行放不下 6 个汉字，标题被切成三段碎行。
 *
 * 这里降到字阶的下一档，而不是另写一个 clamp：站点的样式约束里有一条
 * "font-size 不得直接用 vw"（见 scripts/release-audit.js），自造尺寸会绕开
 * 那五级字阶，也确实被那条断言拦下来过。 */
@media (min-width: 821px) and (max-width: 1199px) {
  .hero h1 { font-size: var(--text-title); }
}
@media (max-width: 820px) { .hero-note { white-space: normal; } }