:root {
  --ink: #282329;
  --muted: #6f666c;
  --paper: #fffdf9;
  --cream: #fff4e8;
  --rose: #ed4b69;
  --rose-dark: #c92f50;
  --orange: #ff8a4c;
  --aqua: #35b7aa;
  --line: #eadde0;
  --white: #ffffff;
  --shadow: 0 16px 38px rgba(73, 43, 51, 0.12);
  --max: 1160px;
}

* {
  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;
  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;
}

.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);
}

.container {
  width: min(calc(100% - 40px), var(--max));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(234, 221, 224, 0.9);
  background: rgba(255, 253, 249, 0.95);
  backdrop-filter: blur(14px);
}

.nav-wrap {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  flex: none;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 800;
}

.brand img {
  width: 42px;
  height: 42px;
}

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

.site-nav a {
  padding: 8px 13px;
  border-bottom: 2px solid transparent;
  color: var(--muted);
  font-size: 15px;
  font-weight: 700;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  border-color: var(--rose);
  color: var(--ink);
}

.site-nav .nav-download {
  margin-left: 8px;
  padding: 9px 18px;
  border: 0;
  border-radius: 4px;
  color: var(--white);
  background: var(--rose);
}

.site-nav .nav-download:hover {
  color: var(--white);
  background: var(--rose-dark);
}

.menu-button {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--ink);
  background: var(--white);
  font-size: 23px;
  cursor: pointer;
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 640px;
  border-bottom: 1px solid var(--line);
  background: var(--cream);
}

.hero::before {
  position: absolute;
  inset: 32px 0 auto;
  height: 1px;
  background: repeating-linear-gradient(90deg, transparent 0 28px, rgba(40, 35, 41, 0.14) 28px 48px);
  content: "";
}

.hero-grid {
  display: grid;
  min-height: 640px;
  align-items: center;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 70px;
  padding-block: 72px 64px;
}

.eyebrow,
.chapter-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  color: var(--rose-dark);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0;
}

.chapter-label::before {
  width: 26px;
  height: 4px;
  background: var(--orange);
  content: "";
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.2;
  letter-spacing: 0;
  overflow-wrap: anywhere;
}

h1 {
  margin-bottom: 22px;
  font-size: clamp(42px, 6vw, 72px);
  font-weight: 900;
}

.hero-copy > p {
  max-width: 600px;
  margin: 0 0 26px;
  color: #544a50;
  font-size: 18px;
}

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

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 11px 24px;
  border: 2px solid var(--rose);
  border-radius: 4px;
  font-weight: 800;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

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

.button-primary {
  color: var(--white);
  background: var(--rose);
  box-shadow: 6px 6px 0 var(--ink);
}

.button-primary:hover {
  background: var(--rose-dark);
}

.button-secondary {
  background: transparent;
}

.hero-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 22px;
  margin: 28px 0 0;
  padding: 0;
  color: var(--muted);
  font-size: 14px;
  list-style: none;
}

.hero-notes li::before {
  margin-right: 7px;
  color: var(--aqua);
  content: "●";
}

.hero-visual {
  position: relative;
  min-height: 510px;
}

.screen {
  position: absolute;
  overflow: hidden;
  width: min(53%, 280px);
  border: 8px solid var(--ink);
  border-radius: 30px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.screen img,
.preview-frame img {
  width: 100%;
  max-width: 399px;
  height: auto;
}

.screen-back {
  top: 0;
  right: 7%;
  transform: rotate(5deg);
}

.screen-front {
  bottom: 0;
  left: 10%;
  transform: rotate(-5deg);
}

.speech-mark {
  position: absolute;
  top: 40px;
  left: 0;
  width: 132px;
  padding: 14px;
  border: 3px solid var(--ink);
  background: var(--white);
  box-shadow: 6px 6px 0 var(--orange);
  font-weight: 900;
  line-height: 1.25;
  transform: rotate(-4deg);
}

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

.stats-list {
  display: grid;
  margin: 0;
  padding: 28px 0;
  grid-template-columns: repeat(4, 1fr);
  list-style: none;
}

.stats-list li {
  padding: 0 28px;
  border-right: 1px solid var(--line);
}

.stats-list li:first-child {
  padding-left: 0;
}

.stats-list li:last-child {
  border-right: 0;
}

.stats-list strong,
.stats-list span {
  display: block;
}

.stats-list strong {
  margin-bottom: 2px;
  font-size: 22px;
}

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

.section {
  padding-block: 88px;
}

.section-tint {
  border-block: 1px solid var(--line);
  background: #f2fbf8;
}

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

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 40px;
}

.section-heading h2 {
  max-width: 680px;
  margin-bottom: 0;
  font-size: clamp(32px, 4vw, 48px);
}

.text-link {
  flex: none;
  border-bottom: 2px solid var(--rose);
  color: var(--rose-dark);
  font-weight: 800;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.feature-card {
  min-height: 240px;
  padding: 26px;
  border: 1px solid var(--line);
  border-top: 5px solid var(--rose);
  border-radius: 6px;
  background: var(--white);
}

.feature-card:nth-child(2) {
  border-top-color: var(--orange);
}

.feature-card:nth-child(3) {
  border-top-color: var(--aqua);
}

.feature-card:nth-child(4) {
  border-top-color: var(--ink);
}

.feature-number {
  display: block;
  margin-bottom: 24px;
  color: var(--rose);
  font-size: 13px;
  font-weight: 900;
}

.feature-card h3 {
  margin-bottom: 12px;
  font-size: 22px;
}

.feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

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

.preview-item {
  margin: 0;
}

.preview-frame {
  overflow: hidden;
  border: 5px solid var(--ink);
  border-radius: 22px;
  background: var(--white);
  box-shadow: 7px 7px 0 rgba(237, 75, 105, 0.22);
  cursor: zoom-in;
}

.preview-item:nth-child(even) .preview-frame {
  box-shadow: 7px 7px 0 rgba(53, 183, 170, 0.22);
}

.preview-item figcaption {
  padding: 15px 4px 0;
  font-size: 15px;
  font-weight: 800;
}

.routes-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.route-block {
  display: grid;
  min-height: 300px;
  align-content: end;
  padding: 34px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--white);
  box-shadow: 8px 8px 0 var(--orange);
}

.route-block:last-child {
  box-shadow: 8px 8px 0 var(--aqua);
}

.route-kicker {
  margin-bottom: auto;
  color: var(--rose-dark);
  font-size: 13px;
  font-weight: 900;
}

.route-block h3 {
  margin: 34px 0 12px;
  font-size: 30px;
}

.route-block p {
  margin: 0 0 18px;
  color: var(--muted);
}

.review-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 70px;
}

.review-feature blockquote {
  margin: 0;
  font-size: clamp(26px, 3vw, 38px);
  font-weight: 800;
  line-height: 1.45;
}

.review-feature cite {
  display: block;
  margin-top: 22px;
  color: #d3c9ce;
  font-size: 14px;
  font-style: normal;
}

.review-list {
  display: grid;
  gap: 20px;
}

.mini-review {
  padding-left: 20px;
  border-left: 3px solid var(--orange);
}

.mini-review:nth-child(2) {
  border-color: var(--aqua);
}

.mini-review p {
  margin: 0 0 7px;
}

.mini-review span {
  color: #d3c9ce;
  font-size: 13px;
}

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

.faq-row {
  display: grid;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  grid-template-columns: 58px 0.7fr 1.3fr;
  gap: 24px;
}

.faq-row strong {
  color: var(--rose);
}

.faq-row h3,
.faq-row p {
  margin: 0;
}

.faq-row h3 {
  font-size: 18px;
}

.faq-row p {
  color: var(--muted);
}

.download-band {
  padding-block: 70px;
  color: var(--white);
  background: var(--rose);
}

.download-grid {
  display: grid;
  align-items: center;
  grid-template-columns: 1fr auto;
  gap: 40px;
}

.download-grid h2 {
  margin-bottom: 12px;
  font-size: clamp(32px, 4vw, 48px);
}

.download-grid p {
  max-width: 700px;
  margin: 0;
}

.download-band .button {
  border-color: var(--white);
  color: var(--rose-dark);
  background: var(--white);
  box-shadow: 6px 6px 0 var(--ink);
}

.site-footer {
  padding-block: 44px 30px;
  color: #d4cbd0;
  background: #211d21;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
}

.footer-brand .brand {
  margin-bottom: 14px;
  color: var(--white);
}

.footer-brand p {
  max-width: 650px;
  margin: 0;
  font-size: 13px;
}

.footer-links {
  display: flex;
  align-items: start;
  gap: 20px;
  font-size: 14px;
  font-weight: 700;
}

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

.copyright {
  margin: 28px 0 0;
  padding-top: 20px;
  border-top: 1px solid #3f373e;
  font-size: 12px;
}

.subhero {
  position: relative;
  overflow: hidden;
  padding-block: 88px 76px;
  border-bottom: 1px solid var(--line);
  background: var(--cream);
}

.subhero::after {
  position: absolute;
  right: -70px;
  bottom: -80px;
  width: 360px;
  height: 210px;
  border: 22px solid rgba(237, 75, 105, 0.15);
  content: "";
  transform: rotate(-12deg);
}

.breadcrumbs {
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 13px;
}

.breadcrumbs a {
  border-bottom: 1px solid var(--rose);
}

.subhero h1 {
  max-width: 850px;
  margin-bottom: 20px;
  font-size: clamp(40px, 6vw, 66px);
}

.subhero p {
  max-width: 780px;
  margin: 0;
  color: var(--muted);
  font-size: 18px;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 70px;
}

.article-main h2 {
  margin: 70px 0 24px;
  padding-bottom: 14px;
  border-bottom: 3px solid var(--ink);
  font-size: 34px;
}

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

.article-main h3 {
  margin: 32px 0 12px;
  font-size: 22px;
}

.article-main p {
  margin: 0 0 18px;
  color: #524a4f;
}

.article-main strong {
  color: var(--ink);
}

.article-aside {
  position: sticky;
  top: 102px;
  align-self: start;
  padding-left: 22px;
  border-left: 3px solid var(--rose);
}

.article-aside strong {
  display: block;
  margin-bottom: 14px;
}

.article-aside a {
  display: block;
  padding: 7px 0;
  color: var(--muted);
  font-size: 14px;
}

.article-aside a:hover {
  color: var(--rose-dark);
}

.step-list {
  display: grid;
  gap: 46px;
  margin-top: 30px;
}

.step {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 24px;
}

.step-number {
  display: grid;
  width: 62px;
  height: 62px;
  place-items: center;
  border: 3px solid var(--ink);
  border-radius: 50%;
  color: var(--white);
  background: var(--rose);
  box-shadow: 4px 4px 0 var(--orange);
  font-size: 22px;
  font-weight: 900;
}

.step h3 {
  margin-top: 2px;
}

.tip-box,
.warning-box {
  margin: 28px 0;
  padding: 20px 22px;
  border-left: 5px solid var(--aqua);
  background: #effaf7;
}

.warning-box {
  border-left-color: var(--orange);
  background: #fff5ed;
}

.check-list,
.plain-list {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.check-list li,
.plain-list li {
  position: relative;
  padding: 8px 0 8px 28px;
  border-bottom: 1px solid var(--line);
}

.check-list li::before {
  position: absolute;
  left: 0;
  color: var(--aqua);
  content: "✓";
  font-weight: 900;
}

.plain-list li::before {
  position: absolute;
  left: 4px;
  color: var(--rose);
  content: "•";
  font-weight: 900;
}

.feature-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.feature-detail {
  min-height: 220px;
  padding: 25px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

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

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

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

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

.faq-question {
  display: grid;
  width: 100%;
  padding: 22px 0;
  border: 0;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  font: inherit;
  font-size: 18px;
  font-weight: 800;
  text-align: left;
  grid-template-columns: 1fr 28px;
  gap: 18px;
}

.faq-question span:last-child {
  color: var(--rose);
  font-size: 26px;
  transition: transform 160ms ease;
}

.faq-question[aria-expanded="true"] span:last-child {
  transform: rotate(45deg);
}

.faq-answer {
  padding: 0 52px 22px 0;
  color: var(--muted);
}

.faq-answer[hidden] {
  display: none;
}

.related-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.related-link {
  padding: 22px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--white);
  font-weight: 800;
}

.related-link:hover {
  box-shadow: 5px 5px 0 var(--orange);
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  padding: 24px;
  place-items: center;
  background: rgba(24, 20, 23, 0.92);
}

.lightbox[hidden] {
  display: none;
}

.lightbox img {
  width: auto;
  max-width: min(399px, 88vw);
  max-height: 84vh;
  border: 5px solid var(--white);
  border-radius: 18px;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 20px;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 50%;
  color: var(--white);
  background: transparent;
  font-size: 27px;
  cursor: pointer;
}

@media (max-width: 960px) {
  .hero-grid {
    gap: 28px;
    grid-template-columns: 0.95fr 1.05fr;
  }

  .feature-grid,
  .preview-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .review-grid,
  .article-layout {
    gap: 42px;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(calc(100% - 28px), var(--max));
  }

  .menu-button {
    display: grid;
    place-items: center;
  }

  .site-nav {
    position: fixed;
    inset: 73px 0 auto;
    display: none;
    padding: 18px 20px 24px;
    border-bottom: 1px solid var(--line);
    background: var(--paper);
    box-shadow: var(--shadow);
  }

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

  .site-nav a {
    padding: 12px;
  }

  .site-nav .nav-download {
    margin-left: 0;
    text-align: center;
  }

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

  .hero-grid {
    grid-template-columns: 1fr;
    padding-block: 62px 45px;
  }

  h1 {
    font-size: 43px;
  }

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

  .hero-visual {
    min-height: 430px;
  }

  .screen {
    width: min(55%, 220px);
    border-width: 6px;
    border-radius: 24px;
  }

  .speech-mark {
    top: 20px;
    width: 104px;
    font-size: 14px;
  }

  .stats-list {
    grid-template-columns: 1fr 1fr;
    gap: 22px 0;
  }

  .stats-list li,
  .stats-list li:first-child {
    padding: 0 16px;
  }

  .stats-list li:nth-child(2) {
    border-right: 0;
  }

  .section {
    padding-block: 64px;
  }

  .section-heading {
    display: block;
  }

  .section-heading .text-link {
    display: inline-block;
    margin-top: 18px;
  }

  .feature-grid,
  .routes-grid,
  .review-grid,
  .download-grid,
  .footer-grid,
  .article-layout,
  .feature-detail-grid,
  .related-links {
    grid-template-columns: 1fr;
  }

  .download-grid {
    justify-items: start;
  }

  .footer-links {
    flex-wrap: wrap;
  }

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

  .faq-row {
    grid-template-columns: 42px 1fr;
  }

  .faq-row p {
    grid-column: 2;
  }
}

@media (max-width: 480px) {
  .brand {
    font-size: 18px;
  }

  .brand img {
    width: 38px;
    height: 38px;
  }

  h1,
  .subhero h1 {
    font-size: 38px;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

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

  .hero-visual {
    min-height: 360px;
  }

  .screen {
    width: 57%;
  }

  .preview-grid {
    grid-template-columns: 1fr 1fr;
    gap: 15px;
  }

  .preview-frame {
    border-width: 3px;
    border-radius: 14px;
    box-shadow: 4px 4px 0 rgba(237, 75, 105, 0.22);
  }

  .preview-item figcaption {
    font-size: 13px;
  }

  .step {
    grid-template-columns: 48px 1fr;
    gap: 16px;
  }

  .step-number {
    width: 44px;
    height: 44px;
    font-size: 17px;
  }

  .faq-question {
    font-size: 16px;
  }
}

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

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