:root {
  --ink: #12141a;
  --paper: #f4f6f8;
  --white: #ffffff;
  --cyan: #18c7c2;
  --coral: #ff4f70;
  --yellow: #f6c85f;
  --muted: #606672;
  --line: #d9dde3;
  --shadow: 7px 7px 0 #12141a;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
}

body.menu-open {
  overflow: hidden;
}

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

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

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

button,
input {
  font: inherit;
}

:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 1000;
  padding: 8px 12px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-150%);
}

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

.container {
  width: min(calc(100% - 36px), var(--container));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 3px solid var(--ink);
}

.nav-wrap {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  gap: 10px;
  font-size: 24px;
  font-weight: 900;
  line-height: 1;
}

.brand img {
  width: 44px;
  height: 44px;
  border: 2px solid var(--ink);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.site-nav > a:not(.download-btn) {
  position: relative;
  font-weight: 700;
}

.site-nav > a:not(.download-btn)::after {
  position: absolute;
  right: 0;
  bottom: -7px;
  left: 0;
  height: 3px;
  content: "";
  background: var(--coral);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}

.site-nav > a:hover::after,
.site-nav > a[aria-current="page"]::after {
  transform: scaleX(1);
}

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  color: var(--white);
  background: var(--ink);
  border: 0;
  cursor: pointer;
}

.menu-button span,
.menu-button::before,
.menu-button::after {
  display: block;
  width: 22px;
  height: 2px;
  margin: 5px auto;
  content: "";
  background: currentColor;
}

.download-btn {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  color: var(--ink);
  background: var(--yellow);
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 var(--ink);
  font-weight: 900;
  transition: transform 150ms ease, box-shadow 150ms ease;
}

.download-btn::before {
  margin-right: 9px;
  content: "\2193";
  font-size: 20px;
  line-height: 1;
}

.download-btn:hover {
  box-shadow: 2px 2px 0 var(--ink);
  transform: translate(2px, 2px);
}

.download-btn.dark {
  color: var(--white);
  background: var(--ink);
  border-color: var(--white);
  box-shadow: 4px 4px 0 var(--white);
}

.hero {
  position: relative;
  overflow: hidden;
  color: var(--white);
  background: var(--ink);
  border-bottom: 3px solid var(--ink);
}

.hero::before,
.hero::after {
  position: absolute;
  content: "";
  pointer-events: none;
}

.hero::before {
  top: 0;
  right: 7%;
  width: 118px;
  height: 100%;
  background: var(--coral);
  transform: skewX(-10deg);
}

.hero::after {
  right: 0;
  bottom: 28px;
  width: 31%;
  height: 34px;
  background: var(--yellow);
}

.hero-grid {
  position: relative;
  z-index: 1;
  min-height: 650px;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  align-items: center;
  gap: 64px;
  padding-block: 64px 70px;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 18px;
  padding: 5px 10px;
  color: var(--ink);
  background: var(--cyan);
  border: 2px solid var(--white);
  font-weight: 900;
}

.hero h1,
.inner-hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(44px, 7vw, 84px);
  line-height: 1.05;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 650px;
  margin: 26px 0 0;
  color: #dfe2e8;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-top: 32px;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding-block: 7px;
  border-bottom: 2px solid currentColor;
  font-weight: 900;
}

.text-link::after {
  content: "\2192";
  transition: transform 150ms ease;
}

.text-link:hover::after {
  transform: translateX(4px);
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.hero-tags li {
  padding: 5px 10px;
  color: var(--white);
  border: 1px solid #656b77;
  font-size: 14px;
}

.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 520px;
}

.hero-visual::before {
  position: absolute;
  width: 330px;
  height: 455px;
  content: "";
  background: var(--cyan);
  border: 3px solid var(--white);
  box-shadow: 14px 14px 0 var(--coral);
  transform: rotate(6deg);
}

.hero-visual img {
  position: relative;
  z-index: 2;
  width: min(288px, 78vw);
  max-width: 400px;
  height: auto;
  border: 8px solid var(--white);
  box-shadow: 10px 10px 0 var(--ink);
  transform: rotate(-3deg);
}

.hero-note {
  position: absolute;
  right: 0;
  bottom: 30px;
  z-index: 3;
  width: 160px;
  padding: 12px;
  color: var(--ink);
  background: var(--yellow);
  border: 2px solid var(--ink);
  font-weight: 900;
  line-height: 1.35;
  transform: rotate(3deg);
}

.fact-strip {
  background: var(--white);
  border-bottom: 3px solid var(--ink);
}

.facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.fact {
  min-height: 116px;
  padding: 22px;
  border-left: 2px solid var(--ink);
}

.fact:last-child {
  border-right: 2px solid var(--ink);
}

.fact strong {
  display: block;
  font-size: 22px;
  line-height: 1.25;
}

.fact span {
  color: var(--muted);
  font-size: 14px;
}

.section {
  padding-block: 88px;
}

.section.compact {
  padding-block: 64px;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 38px;
}

.section h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 50px);
  line-height: 1.15;
  letter-spacing: 0;
}

.section-kicker {
  color: var(--coral);
  font-family: Arial, sans-serif;
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 3px solid var(--ink);
  border-left: 3px solid var(--ink);
}

.feature-item {
  min-height: 245px;
  padding: 28px;
  background: var(--white);
  border-right: 3px solid var(--ink);
  border-bottom: 3px solid var(--ink);
}

.feature-item:nth-child(2) {
  background: var(--cyan);
}

.feature-item:nth-child(5) {
  background: var(--yellow);
}

.feature-number {
  display: block;
  margin-bottom: 32px;
  font: 900 15px/1 Arial, sans-serif;
}

.feature-item h3 {
  margin: 0 0 12px;
  font-size: 23px;
  line-height: 1.25;
}

.feature-item p {
  margin: 0;
  color: #3e434d;
}

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

.showcase .section-kicker {
  color: var(--cyan);
}

.shot-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  align-items: start;
  gap: 20px;
}

.shot {
  margin: 0;
}

.shot:nth-child(even) {
  padding-top: 38px;
}

.shot-button {
  width: 100%;
  padding: 0;
  background: transparent;
  border: 0;
  cursor: zoom-in;
}

.app-shot {
  width: 100%;
  max-width: 400px;
  height: auto;
  aspect-ratio: 3 / 5;
  object-fit: cover;
  background: #e8eaee;
  border: 4px solid var(--white);
  transition: transform 180ms ease;
}

.shot-button:hover .app-shot {
  transform: translateY(-7px);
}

.shot figcaption {
  padding-top: 12px;
  color: #c7cbd3;
  font-size: 14px;
}

.shot figcaption strong {
  display: block;
  color: var(--white);
  font-size: 16px;
}

.reader-flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  counter-reset: flow;
}

.flow-step {
  position: relative;
  min-height: 230px;
  padding: 30px 28px;
  background: var(--white);
  border-top: 3px solid var(--ink);
  border-bottom: 3px solid var(--ink);
  border-left: 3px solid var(--ink);
  counter-increment: flow;
}

.flow-step:last-child {
  border-right: 3px solid var(--ink);
}

.flow-step::before {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  margin-bottom: 24px;
  content: counter(flow, decimal-leading-zero);
  color: var(--white);
  background: var(--ink);
  font: 900 15px/1 Arial, sans-serif;
}

.flow-step:nth-child(2)::before {
  color: var(--ink);
  background: var(--cyan);
}

.flow-step:nth-child(3)::before {
  color: var(--ink);
  background: var(--coral);
}

.flow-step:nth-child(4)::before {
  color: var(--ink);
  background: var(--yellow);
}

.flow-step h3 {
  margin: 0 0 10px;
  font-size: 21px;
}

.flow-step p {
  margin: 0;
  color: var(--muted);
}

.deep-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 26px;
}

.deep-link {
  position: relative;
  min-height: 285px;
  padding: 36px;
  overflow: hidden;
  background: var(--white);
  border: 3px solid var(--ink);
  box-shadow: var(--shadow);
}

.deep-link:nth-child(2) {
  background: var(--coral);
}

.deep-link::after {
  position: absolute;
  right: 18px;
  bottom: -18px;
  content: "\2192";
  font: 900 120px/1 Arial, sans-serif;
  opacity: 0.14;
}

.deep-link h3 {
  margin: 24px 0 12px;
  font-size: 30px;
  line-height: 1.2;
}

.deep-link p {
  max-width: 520px;
  margin: 0 0 24px;
}

.label {
  display: inline-block;
  padding: 3px 8px;
  color: var(--white);
  background: var(--ink);
  font: 900 13px/1.6 Arial, sans-serif;
}

.proof-band {
  background: var(--cyan);
  border-block: 3px solid var(--ink);
}

.proof-grid {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 50px;
  align-items: start;
}

.score {
  padding: 34px;
  color: var(--white);
  background: var(--ink);
  border: 3px solid var(--white);
  box-shadow: 10px 10px 0 var(--coral);
}

.score strong {
  display: block;
  font: 900 76px/1 Arial, sans-serif;
}

.score span {
  display: block;
  margin-top: 12px;
  color: #dce0e7;
}

.quotes {
  display: grid;
  gap: 18px;
}

.quote {
  margin: 0;
  padding: 24px;
  background: var(--white);
  border: 2px solid var(--ink);
}

.quote p {
  margin: 0 0 10px;
  font-weight: 700;
}

.quote cite {
  color: var(--muted);
  font-style: normal;
  font-size: 14px;
}

.faq-list {
  border-top: 3px solid var(--ink);
}

.faq-list details {
  background: var(--white);
  border-right: 3px solid var(--ink);
  border-bottom: 3px solid var(--ink);
  border-left: 3px solid var(--ink);
}

.faq-list summary {
  position: relative;
  padding: 21px 58px 21px 22px;
  cursor: pointer;
  font-size: 18px;
  font-weight: 900;
  list-style: none;
}

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

.faq-list summary::after {
  position: absolute;
  top: 50%;
  right: 22px;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  content: "+";
  color: var(--white);
  background: var(--ink);
  transform: translateY(-50%);
}

.faq-list details[open] summary::after {
  content: "\2212";
  background: var(--coral);
}

.faq-answer {
  padding: 0 22px 22px;
  color: #454b55;
}

.faq-answer p {
  margin: 0;
}

.faq-answer a {
  color: #006d70;
  border-bottom: 1px solid currentColor;
  font-weight: 700;
}

.download-band {
  padding-block: 54px;
  color: var(--white);
  background: var(--coral);
  border-block: 3px solid var(--ink);
}

.download-band .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
}

.download-band h2 {
  margin: 0 0 6px;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.15;
}

.download-band p,
.download-band .band-copy {
  margin: 0;
  color: #fff2f5;
}

.site-footer {
  padding-block: 45px 24px;
  color: #bec3cc;
  background: var(--ink);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 1fr;
  gap: 44px;
}

.footer-brand {
  color: var(--white);
}

.footer-brand .brand {
  margin-bottom: 16px;
}

.footer-brand p,
.disclaimer {
  margin: 0;
  font-size: 14px;
}

.footer-links strong {
  display: block;
  margin-bottom: 12px;
  color: var(--white);
}

.footer-links a {
  display: block;
  width: max-content;
  margin-block: 7px;
}

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

.copyright {
  margin-top: 34px;
  padding-top: 22px;
  border-top: 1px solid #343842;
  font-size: 13px;
}

.inner-hero {
  position: relative;
  overflow: hidden;
  padding-block: 74px 82px;
  color: var(--white);
  background: var(--ink);
  border-bottom: 3px solid var(--ink);
}

.inner-hero::after {
  position: absolute;
  top: 0;
  right: 8%;
  width: 88px;
  height: 100%;
  content: "";
  background: var(--cyan);
  transform: skewX(-13deg);
}

.inner-hero.coral::after {
  background: var(--coral);
}

.inner-hero .container {
  position: relative;
  z-index: 1;
}

.inner-hero h1 {
  font-size: clamp(42px, 6vw, 72px);
}

.inner-hero p {
  max-width: 720px;
  margin: 24px 0 0;
  color: #d8dce4;
  font-size: 18px;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  color: #b9bec8;
  font-size: 14px;
}

.breadcrumb a:hover {
  color: var(--cyan);
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 58px;
  align-items: start;
}

.article-main h2 {
  margin: 70px 0 24px;
  padding-bottom: 12px;
  border-bottom: 3px solid var(--ink);
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.2;
}

.article-main h2:first-child {
  margin-top: 0;
}

.article-main h3 {
  margin: 0 0 10px;
  font-size: 22px;
  line-height: 1.3;
}

.article-main p {
  margin: 0 0 16px;
  color: #404650;
}

.article-main a:not(.download-btn) {
  color: #006d70;
  border-bottom: 1px solid currentColor;
  font-weight: 700;
}

.article-aside {
  position: sticky;
  top: 104px;
  padding: 24px;
  background: var(--white);
  border: 3px solid var(--ink);
  box-shadow: 6px 6px 0 var(--cyan);
}

.article-aside strong {
  display: block;
  margin-bottom: 12px;
  font-size: 18px;
}

.article-aside a:not(.download-btn) {
  display: block;
  padding-block: 8px;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.article-aside .download-btn {
  width: 100%;
  margin-top: 20px;
}

.step-list {
  display: grid;
  gap: 18px;
  counter-reset: guide;
}

.guide-step {
  display: grid;
  grid-template-columns: 74px 1fr;
  gap: 22px;
  padding: 25px;
  background: var(--white);
  border: 2px solid var(--ink);
  counter-increment: guide;
}

.guide-step::before {
  display: grid;
  width: 56px;
  height: 56px;
  place-items: center;
  content: counter(guide, decimal-leading-zero);
  color: var(--white);
  background: var(--ink);
  font: 900 17px/1 Arial, sans-serif;
}

.guide-step:nth-child(3n + 2)::before {
  color: var(--ink);
  background: var(--cyan);
}

.guide-step:nth-child(3n)::before {
  color: var(--ink);
  background: var(--yellow);
}

.guide-step p:last-child {
  margin-bottom: 0;
}

.info-table-wrap {
  overflow-x: auto;
  border: 3px solid var(--ink);
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
}

.info-table th,
.info-table td {
  padding: 15px 18px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.info-table th {
  color: var(--white);
  background: var(--ink);
}

.info-table tr:last-child td {
  border-bottom: 0;
}

.check-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  position: relative;
  padding: 16px 16px 16px 50px;
  background: var(--white);
  border: 2px solid var(--ink);
}

.check-list li::before {
  position: absolute;
  top: 15px;
  left: 16px;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  content: "\2713";
  color: var(--ink);
  background: var(--cyan);
  font-weight: 900;
}

.feature-detail {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 24px;
  padding: 26px;
  background: var(--white);
  border: 2px solid var(--ink);
  border-bottom: 0;
}

.feature-detail:last-child {
  border-bottom: 2px solid var(--ink);
}

.feature-mark {
  display: grid;
  width: 70px;
  height: 70px;
  place-items: center;
  color: var(--white);
  background: var(--ink);
  border: 4px solid var(--coral);
  font: 900 22px/1 Arial, sans-serif;
}

.feature-detail:nth-child(even) .feature-mark {
  color: var(--ink);
  background: var(--yellow);
  border-color: var(--cyan);
}

.callout {
  padding: 24px;
  background: var(--yellow);
  border: 3px solid var(--ink);
  box-shadow: 6px 6px 0 var(--ink);
}

.callout strong {
  display: block;
  margin-bottom: 6px;
  font-size: 20px;
}

.callout p:last-child {
  margin-bottom: 0;
}

.related-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.related-item {
  padding: 24px;
  background: var(--white);
  border: 2px solid var(--ink);
}

.related-item h3 {
  margin: 0 0 8px;
}

.related-item p {
  margin: 0 0 12px;
}

.image-dialog {
  max-width: min(92vw, 520px);
  padding: 14px;
  background: var(--ink);
  border: 3px solid var(--white);
}

.image-dialog::backdrop {
  background: rgba(0, 0, 0, 0.84);
}

.image-dialog img {
  width: auto;
  max-width: 400px;
  max-height: 80vh;
  margin: auto;
}

.dialog-close {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 40px;
  height: 40px;
  padding: 0;
  color: var(--white);
  background: var(--coral);
  border: 2px solid var(--white);
  cursor: pointer;
  font-size: 24px;
  line-height: 1;
}

@media (max-width: 980px) {
  .site-nav {
    position: fixed;
    top: 76px;
    right: 0;
    bottom: 0;
    left: 0;
    display: none;
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    padding: 24px;
    background: var(--white);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav > a:not(.download-btn) {
    padding: 16px 6px;
    border-bottom: 1px solid var(--line);
    font-size: 20px;
  }

  .site-nav .download-btn {
    margin-top: 22px;
  }

  .menu-button {
    display: block;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 24px;
    padding-top: 54px;
  }

  .hero::before {
    right: -50px;
  }

  .hero-visual {
    min-height: 520px;
  }

  .facts,
  .feature-grid {
    grid-template-columns: 1fr 1fr;
  }

  .fact:nth-child(3) {
    border-top: 2px solid var(--ink);
  }

  .fact:nth-child(4) {
    border-top: 2px solid var(--ink);
  }

  .shot-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .reader-flow {
    grid-template-columns: 1fr 1fr;
  }

  .flow-step:nth-child(3) {
    border-top: 0;
  }

  .flow-step:nth-child(2) {
    border-right: 3px solid var(--ink);
  }

  .proof-grid,
  .article-layout {
    grid-template-columns: 1fr;
  }

  .article-aside {
    position: static;
    order: -1;
  }

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

@media (max-width: 680px) {
  .container {
    width: min(calc(100% - 24px), var(--container));
  }

  .hero h1,
  .inner-hero h1 {
    font-size: 42px;
  }

  .hero-grid {
    min-height: auto;
    padding-block: 46px 52px;
  }

  .hero-copy,
  .inner-hero p {
    font-size: 16px;
  }

  .hero-visual {
    min-height: 460px;
  }

  .hero-visual::before {
    width: 260px;
    height: 400px;
  }

  .hero-note {
    right: 4px;
    width: 136px;
    font-size: 13px;
  }

  .facts,
  .feature-grid,
  .reader-flow,
  .deep-links,
  .proof-grid,
  .footer-grid,
  .check-list,
  .related-grid {
    grid-template-columns: 1fr;
  }

  .fact,
  .fact:last-child {
    border-right: 2px solid var(--ink);
    border-bottom: 2px solid var(--ink);
  }

  .fact:nth-child(2) {
    border-top: 2px solid var(--ink);
  }

  .section {
    padding-block: 64px;
  }

  .section-head {
    align-items: start;
    flex-direction: column;
  }

  .feature-item {
    min-height: auto;
  }

  .shot-grid {
    grid-template-columns: 1fr 1fr;
    gap: 14px;
  }

  .shot:nth-child(even) {
    padding-top: 22px;
  }

  .flow-step,
  .flow-step:nth-child(2),
  .flow-step:nth-child(3),
  .flow-step:last-child {
    border-top: 0;
    border-right: 3px solid var(--ink);
  }

  .flow-step:first-child {
    border-top: 3px solid var(--ink);
  }

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

  .download-band .download-btn {
    width: 100%;
  }

  .guide-step,
  .feature-detail {
    grid-template-columns: 1fr;
  }

  .article-main h2 {
    margin-top: 54px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}