:root {
  --ink: #24323b;
  --muted: #65717a;
  --paper: #fff8f3;
  --white: #ffffff;
  --coral: #e85d75;
  --coral-dark: #c8415b;
  --orange: #ffb84c;
  --teal: #3d8b7d;
  --line: #e8ddd6;
  --soft-pink: #fff0f2;
  --soft-teal: #eaf6f3;
  --shadow: 0 18px 45px rgba(36, 50, 59, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

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

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

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

button {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 8px 12px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-150%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: 72px;
  border-bottom: 1px solid rgba(36, 50, 59, 0.09);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1180px, calc(100% - 40px));
  height: 100%;
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  min-width: 154px;
  font-size: 20px;
  font-weight: 800;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 8px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.main-nav a:not(.button) {
  position: relative;
  padding: 8px 0;
  color: #40505a;
  font-size: 14px;
  font-weight: 700;
}

.main-nav a:not(.button)::after {
  position: absolute;
  right: 0;
  bottom: 2px;
  left: 0;
  height: 2px;
  background: var(--coral);
  content: "";
  transform: scaleX(0);
  transition: transform 180ms ease;
}

.main-nav a[aria-current="page"]::after,
.main-nav a:not(.button):hover::after {
  transform: scaleX(1);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: var(--white);
  cursor: pointer;
}

.nav-toggle span,
.nav-toggle::before,
.nav-toggle::after {
  display: block;
  width: 20px;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
  content: "";
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 10px 22px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  color: var(--white);
  background: var(--coral);
  box-shadow: 4px 4px 0 var(--ink);
  font-size: 15px;
  font-weight: 800;
  transition: transform 150ms ease, box-shadow 150ms ease, background 150ms ease;
}

.button:hover,
.button:focus-visible {
  background: var(--coral-dark);
  box-shadow: 2px 2px 0 var(--ink);
  transform: translate(2px, 2px);
}

.button-secondary {
  color: var(--ink);
  background: var(--orange);
}

.button-secondary:hover,
.button-secondary:focus-visible {
  background: #f3a72f;
}

.button-small {
  min-height: 40px;
  padding: 7px 17px;
  border-width: 1px;
  box-shadow: 3px 3px 0 var(--ink);
  font-size: 14px;
}

.container {
  width: min(1120px, calc(100% - 40px));
  margin: 0 auto;
}

.section {
  padding: 84px 0;
}

.section-compact {
  padding: 58px 0;
}

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

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

.section-label {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 10px;
  color: var(--coral-dark);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.section-label::before {
  width: 28px;
  height: 4px;
  background: var(--orange);
  content: "";
}

.section h2,
.page-hero h1 {
  margin: 0 0 30px;
  font-size: 38px;
  line-height: 1.28;
  letter-spacing: 0;
}

.section-dark .section-label {
  color: #ffc9d2;
}

.home-hero {
  position: relative;
  overflow: hidden;
  min-height: 610px;
  background: var(--paper);
}

.home-hero::before,
.home-hero::after {
  position: absolute;
  width: 120px;
  height: 120px;
  border: 3px solid var(--ink);
  content: "";
  opacity: 0.12;
  transform: rotate(12deg);
}

.home-hero::before {
  top: 95px;
  left: -58px;
}

.home-hero::after {
  right: -55px;
  bottom: 42px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(410px, 0.9fr);
  gap: 72px;
  align-items: center;
  min-height: 610px;
  padding: 48px 0 60px;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  padding: 5px 11px;
  border: 1px solid var(--ink);
  border-radius: 4px;
  color: var(--ink);
  background: var(--orange);
  font-size: 13px;
  font-weight: 800;
}

.hero-copy h1 {
  max-width: 680px;
  margin: 0 0 20px;
  font-size: 62px;
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-copy > p {
  max-width: 640px;
  margin: 0 0 28px;
  color: #4d5b64;
  font-size: 18px;
  line-height: 1.9;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

.hero-note {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.phone-stage {
  position: relative;
  height: 475px;
}

.phone-stage::before {
  position: absolute;
  top: 32px;
  right: 14px;
  bottom: 38px;
  left: 66px;
  border: 3px solid var(--ink);
  background: var(--teal);
  content: "";
  transform: rotate(4deg);
}

.phone {
  position: absolute;
  overflow: hidden;
  width: 230px;
  border: 8px solid var(--ink);
  border-radius: 28px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.phone img {
  width: 100%;
  max-width: 400px;
  height: auto;
}

.phone-main {
  top: 4px;
  left: 38px;
  z-index: 2;
  transform: rotate(-4deg);
}

.phone-side {
  right: 8px;
  bottom: 0;
  z-index: 3;
  width: 205px;
  transform: rotate(5deg);
}

.issue-stamp {
  position: absolute;
  top: 25px;
  right: 10px;
  z-index: 4;
  display: grid;
  width: 82px;
  height: 82px;
  place-items: center;
  border: 3px solid var(--ink);
  border-radius: 50%;
  color: var(--white);
  background: var(--coral);
  font-size: 13px;
  font-weight: 900;
  line-height: 1.25;
  text-align: center;
  transform: rotate(8deg);
}

.stats-strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

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

.stat {
  padding: 27px 24px;
  border-right: 1px solid var(--line);
}

.stat:last-child {
  border-right: 0;
}

.stat strong {
  display: block;
  color: var(--coral-dark);
  font-size: 24px;
  line-height: 1.3;
}

.stat span {
  color: var(--muted);
  font-size: 13px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.feature-item {
  min-height: 245px;
  padding: 30px;
  background: var(--white);
}

.feature-number {
  display: inline-grid;
  width: 42px;
  height: 42px;
  margin-bottom: 35px;
  place-items: center;
  border: 2px solid var(--ink);
  color: var(--ink);
  background: var(--orange);
  font-size: 13px;
  font-weight: 900;
}

.feature-item:nth-child(2) .feature-number,
.feature-item:nth-child(5) .feature-number {
  color: var(--white);
  background: var(--teal);
}

.feature-item h3 {
  margin: 0 0 9px;
  font-size: 20px;
}

.feature-item p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.screens-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 22px;
}

.screen-figure {
  margin: 0;
}

.screen-frame {
  overflow: hidden;
  max-width: 320px;
  margin: 0 auto;
  border: 3px solid var(--ink);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 7px 7px 0 rgba(36, 50, 59, 0.16);
}

.screen-frame img {
  width: 100%;
  max-width: 400px;
  height: auto;
}

.screen-figure figcaption {
  margin-top: 14px;
  font-size: 14px;
  font-weight: 800;
  text-align: center;
}

.screen-figure figcaption span {
  display: block;
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
}

.path-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.path-link {
  position: relative;
  min-height: 290px;
  padding: 34px;
  border: 2px solid var(--ink);
  border-radius: 8px;
  background: var(--soft-pink);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.path-link:nth-child(2) {
  background: var(--soft-teal);
}

.path-link:hover,
.path-link:focus-visible {
  box-shadow: 8px 8px 0 var(--ink);
  transform: translate(-3px, -3px);
}

.path-tag {
  display: inline-block;
  margin-bottom: 38px;
  padding: 4px 9px;
  border: 1px solid var(--ink);
  background: var(--white);
  font-size: 12px;
  font-weight: 800;
}

.path-link h3 {
  max-width: 430px;
  margin: 0 0 12px;
  font-size: 29px;
  line-height: 1.35;
}

.path-link p {
  max-width: 470px;
  margin: 0;
  color: #52616a;
}

.path-arrow {
  position: absolute;
  right: 28px;
  bottom: 24px;
  font-size: 30px;
  font-weight: 900;
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review {
  margin: 0;
  padding: 27px;
  border-top: 4px solid var(--orange);
  background: #31414b;
}

.review:nth-child(2) {
  border-top-color: var(--coral);
}

.review:nth-child(3) {
  border-top-color: #69b3a7;
}

.review blockquote {
  margin: 0 0 24px;
  font-size: 15px;
}

.review cite {
  color: #b8c5cc;
  font-size: 13px;
  font-style: normal;
}

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

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

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 22px 0;
  border: 0;
  color: var(--ink);
  background: transparent;
  font-size: 17px;
  font-weight: 800;
  text-align: left;
  cursor: pointer;
}

.faq-question::after {
  flex: 0 0 auto;
  width: 30px;
  height: 30px;
  margin-left: 20px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  content: "+";
  font-size: 20px;
  line-height: 27px;
  text-align: center;
}

.faq-question[aria-expanded="true"]::after {
  content: "−";
}

.faq-answer {
  max-width: 880px;
  padding: 0 55px 22px 0;
  color: var(--muted);
}

.faq-answer p {
  margin: 0;
}

.text-link {
  display: inline-flex;
  margin-top: 24px;
  border-bottom: 2px solid var(--coral);
  color: var(--coral-dark);
  font-weight: 800;
}

.download-band {
  border-top: 3px solid var(--ink);
  border-bottom: 3px solid var(--ink);
  background: var(--orange);
}

.download-band-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 44px 0;
}

.download-band h2 {
  margin: 0 0 4px;
  font-size: 30px;
}

.download-band p,
.download-band .band-copy {
  margin: 0;
  color: #4d4a42;
}

.page-hero {
  position: relative;
  overflow: hidden;
  padding: 72px 0 68px;
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.page-hero .container {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 70px;
  align-items: center;
}

.page-hero h1 {
  margin-bottom: 18px;
  font-size: 48px;
}

.page-hero p {
  max-width: 740px;
  margin: 0;
  color: #53616a;
  font-size: 17px;
}

.page-marker {
  display: grid;
  width: 220px;
  height: 220px;
  place-items: center;
  border: 3px solid var(--ink);
  color: var(--white);
  background: var(--teal);
  box-shadow: 12px 12px 0 var(--orange);
  font-size: 76px;
  font-weight: 900;
  transform: rotate(4deg);
}

.breadcrumb {
  margin: 0 0 14px;
  color: var(--coral-dark);
  font-size: 13px;
  font-weight: 800;
}

.breadcrumb a {
  border-bottom: 1px solid currentColor;
}

.article-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: 68px;
}

.toc {
  position: sticky;
  top: 96px;
  align-self: start;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--paper);
}

.toc strong {
  display: block;
  margin-bottom: 12px;
  font-size: 14px;
}

.toc a {
  display: block;
  padding: 7px 0;
  color: var(--muted);
  font-size: 13px;
}

.toc a:hover {
  color: var(--coral-dark);
}

.article h2 {
  margin: 58px 0 20px;
  padding-bottom: 12px;
  border-bottom: 3px solid var(--ink);
  font-size: 30px;
}

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

.article h3 {
  margin: 30px 0 10px;
  font-size: 21px;
}

.article p {
  margin: 0 0 16px;
  color: #495861;
}

.article ul,
.article ol {
  margin: 0 0 20px;
  padding-left: 22px;
  color: #495861;
}

.steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: steps;
}

.step {
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr);
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
  counter-increment: steps;
}

.step::before {
  display: grid;
  width: 58px;
  height: 58px;
  place-items: center;
  border: 2px solid var(--ink);
  background: var(--orange);
  content: "0" counter(steps);
  font-weight: 900;
}

.step h3 {
  margin: 0 0 8px;
}

.step p {
  margin-bottom: 10px;
}

.notice {
  margin: 24px 0;
  padding: 18px 20px;
  border-left: 5px solid var(--coral);
  background: var(--soft-pink);
  color: #495861;
}

.check-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  padding: 14px 16px 14px 44px;
  border: 1px solid var(--line);
  background: var(--white);
  position: relative;
}

.check-list li::before {
  position: absolute;
  top: 14px;
  left: 15px;
  color: var(--teal);
  content: "✓";
  font-weight: 900;
}

.feature-detail {
  display: grid;
  grid-template-columns: 150px minmax(0, 1fr);
  gap: 24px;
  padding: 26px 0;
  border-bottom: 1px solid var(--line);
}

.feature-detail strong {
  color: var(--coral-dark);
  font-size: 16px;
}

.feature-detail h3 {
  margin-top: 0;
}

.site-footer {
  padding: 44px 0 26px;
  color: #d6dee2;
  background: #1b272e;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr 1fr;
  gap: 50px;
  padding-bottom: 30px;
}

.footer-brand {
  margin-bottom: 12px;
  color: var(--white);
}

.site-footer p {
  margin: 0;
  color: #aebcc3;
  font-size: 13px;
}

.footer-copy {
  color: #aebcc3;
  font-size: 13px;
}

.site-footer h2 {
  margin: 0 0 14px;
  color: var(--white);
  font-size: 15px;
}

.footer-links a {
  display: block;
  margin: 6px 0;
  color: #c9d4d9;
  font-size: 13px;
}

.disclaimer {
  padding-top: 20px;
  border-top: 1px solid #34444d;
}

.copyright {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  margin-top: 18px;
  color: #819198;
  font-size: 12px;
}

@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 30px;
  }

  .hero-copy h1 {
    font-size: 50px;
  }

  .phone {
    width: 205px;
  }

  .phone-side {
    width: 180px;
  }

  .screens-grid {
    grid-template-columns: repeat(2, 1fr);
    row-gap: 34px;
  }

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

  .toc {
    position: static;
    display: flex;
    flex-wrap: wrap;
    gap: 4px 18px;
  }

  .toc strong {
    width: 100%;
  }
}

@media (max-width: 760px) {
  .site-header {
    height: 64px;
  }

  .nav-wrap,
  .container {
    width: min(calc(100% - 28px), 1120px);
  }

  .nav-toggle {
    display: block;
  }

  .main-nav {
    position: absolute;
    top: 64px;
    right: 0;
    left: 0;
    display: none;
    padding: 14px;
    border-bottom: 1px solid var(--line);
    background: var(--white);
    box-shadow: 0 16px 30px rgba(36, 50, 59, 0.12);
  }

  .main-nav.is-open {
    display: grid;
  }

  .main-nav a:not(.button) {
    padding: 10px 8px;
  }

  .home-hero,
  .hero-grid {
    min-height: auto;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    padding: 42px 0 46px;
  }

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

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

  .phone-stage {
    height: 430px;
  }

  .phone-stage::before {
    left: 10%;
  }

  .phone-main {
    left: 12%;
  }

  .phone-side {
    right: 10%;
  }

  .stats-grid,
  .feature-grid,
  .path-grid,
  .review-grid,
  .footer-grid,
  .check-list {
    grid-template-columns: 1fr;
  }

  .stat {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .stat:last-child {
    border-bottom: 0;
  }

  .section {
    padding: 62px 0;
  }

  .section h2,
  .page-hero h1 {
    font-size: 34px;
  }

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

  .page-hero .container {
    grid-template-columns: 1fr;
  }

  .page-marker {
    width: 120px;
    height: 120px;
    font-size: 46px;
  }

  .feature-detail {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .copyright {
    flex-direction: column;
  }
}

@media (max-width: 430px) {
  .brand {
    min-width: 0;
    font-size: 17px;
  }

  .brand img {
    width: 36px;
    height: 36px;
  }

  .hero-copy h1 {
    font-size: 38px;
  }

  .phone-stage {
    height: 205px;
  }

  .phone-stage::before {
    top: 18px;
    right: 8%;
    bottom: 18px;
    left: 12%;
  }

  .phone {
    width: 112px;
    border-width: 5px;
    border-radius: 18px;
  }

  .phone-main {
    top: 0;
    left: 15%;
  }

  .phone-side {
    right: 13%;
    width: 98px;
  }

  .issue-stamp {
    top: 7px;
    right: 4%;
    width: 56px;
    height: 56px;
    font-size: 9px;
  }

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

  .section h2,
  .page-hero h1 {
    font-size: 30px;
  }

  .step {
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 15px;
  }

  .step::before {
    width: 48px;
    height: 48px;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}