:root {
  --paper: #fffaf2;
  --paper-deep: #f3eee4;
  --ink: #15171a;
  --muted: #62666d;
  --coral: #ff5a36;
  --coral-dark: #d83e20;
  --teal: #28b7a0;
  --yellow: #ffd65a;
  --white: #ffffff;
  --line: 2px solid var(--ink);
  --radius: 6px;
  --content: 1180px;
}

* {
  box-sizing: border-box;
  letter-spacing: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  line-height: 1.7;
}

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: 1000;
  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: 100;
  border-bottom: var(--line);
  background: rgba(255, 250, 242, 0.96);
  backdrop-filter: blur(12px);
}

.nav-shell {
  width: min(calc(100% - 32px), var(--content));
  min-height: 76px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  gap: 11px;
  font-size: 1.2rem;
  font-weight: 900;
}

.brand img {
  width: 44px;
  height: 44px;
  border: 2px solid var(--ink);
  border-radius: 7px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
}

.nav-links a:not(.button) {
  position: relative;
  padding: 8px 0;
  font-weight: 700;
}

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

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

.menu-toggle {
  width: 44px;
  height: 44px;
  display: none;
  align-items: center;
  justify-content: center;
  border: var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  background: var(--white);
  font-size: 1.4rem;
  font-weight: 900;
  cursor: pointer;
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 11px 22px;
  border: var(--line);
  border-radius: var(--radius);
  color: var(--white);
  background: var(--coral);
  box-shadow: 4px 4px 0 var(--ink);
  font-weight: 900;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.button::before {
  content: "↓";
  font-size: 1.15rem;
  line-height: 1;
}

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

.button:focus-visible,
.menu-toggle:focus-visible,
.faq-question:focus-visible,
a:focus-visible {
  outline: 3px solid var(--teal);
  outline-offset: 3px;
}

.button.small {
  min-height: 42px;
  padding: 8px 18px;
}

.hero {
  position: relative;
  overflow: hidden;
  border-bottom: var(--line);
  background: var(--yellow);
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  width: 180px;
  height: 2px;
  background: var(--ink);
  opacity: 0.18;
}

.hero::before {
  top: 90px;
  right: -20px;
  transform: rotate(-28deg);
}

.hero::after {
  bottom: 90px;
  left: -30px;
  transform: rotate(22deg);
}

.hero-shell {
  width: min(calc(100% - 32px), var(--content));
  min-height: 640px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.86fr);
  align-items: center;
  gap: 72px;
  padding: 70px 0 58px;
}

.eyebrow {
  width: fit-content;
  margin: 0 0 20px;
  padding: 6px 11px;
  border: var(--line);
  color: var(--white);
  background: var(--ink);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

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

h1,
h2,
h3 {
  line-height: 1.18;
}

h1 {
  max-width: 760px;
  margin-bottom: 22px;
  font-size: 3.65rem;
  font-weight: 950;
}

.hero-copy > p {
  max-width: 660px;
  margin-bottom: 26px;
  font-size: 1.08rem;
}

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

.text-link {
  padding: 8px 2px;
  border-bottom: 3px solid var(--ink);
  font-weight: 900;
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 34px;
  padding: 0;
  list-style: none;
}

.trust-row li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 800;
}

.trust-row li::before {
  content: "✓";
  width: 25px;
  height: 25px;
  display: grid;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--teal);
  font-size: 0.78rem;
}

.phone-stage {
  min-height: 510px;
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}

.phone-frame {
  position: relative;
  width: 270px;
  padding: 12px;
  border: 3px solid var(--ink);
  border-radius: 28px;
  background: var(--ink);
  box-shadow: 14px 14px 0 var(--coral);
  transform: rotate(2deg);
}

.phone-frame::before {
  content: "";
  position: absolute;
  z-index: 2;
  top: 5px;
  left: 50%;
  width: 72px;
  height: 8px;
  border-radius: 6px;
  background: var(--ink);
  transform: translateX(-50%);
}

.phone-frame img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: 17px;
}

.mini-frame {
  position: absolute;
  right: 0;
  bottom: 28px;
  width: 158px;
  padding: 7px;
  border: var(--line);
  border-radius: 18px;
  background: var(--ink);
  box-shadow: 8px 8px 0 var(--teal);
  transform: rotate(-5deg);
}

.mini-frame img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: 11px;
}

.burst {
  position: absolute;
  top: 34px;
  right: 14px;
  width: 110px;
  height: 110px;
  display: grid;
  place-items: center;
  border: 3px solid var(--ink);
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 6px 6px 0 var(--ink);
  font-weight: 950;
  text-align: center;
  transform: rotate(7deg);
}

.section {
  padding: 86px 0;
}

.section.alt {
  border-top: var(--line);
  border-bottom: var(--line);
  background: var(--paper-deep);
}

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

.section-shell {
  width: min(calc(100% - 32px), var(--content));
  margin: 0 auto;
}

.section-kicker {
  margin-bottom: 8px;
  color: var(--coral-dark);
  font-size: 0.76rem;
  font-weight: 950;
  text-transform: uppercase;
}

.dark .section-kicker {
  color: var(--yellow);
}

h2 {
  max-width: 760px;
  margin-bottom: 34px;
  font-size: 2.35rem;
  font-weight: 950;
}

h3 {
  margin-bottom: 10px;
  font-size: 1.16rem;
  font-weight: 950;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: var(--line);
  border-left: var(--line);
}

.feature-item {
  min-height: 260px;
  padding: 28px;
  border-right: var(--line);
  border-bottom: var(--line);
  background: var(--white);
}

.feature-number {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  margin-bottom: 42px;
  border: var(--line);
  border-radius: 50%;
  background: var(--yellow);
  font-weight: 950;
}

.feature-item:nth-child(2) .feature-number,
.feature-item:nth-child(4) .feature-number {
  background: var(--teal);
}

.feature-item p {
  margin-bottom: 0;
  color: var(--muted);
}

.showcase-grid {
  display: grid;
  grid-template-columns: 0.78fr 1.22fr;
  align-items: center;
  gap: 68px;
}

.showcase-copy ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.showcase-copy li {
  padding: 16px 0;
  border-bottom: 1px solid #b9b3aa;
}

.showcase-copy strong {
  display: block;
  margin-bottom: 2px;
}

.screens-row {
  min-height: 540px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
}

.screen-shot {
  width: 245px;
  max-width: 400px;
  height: auto;
  border: 3px solid var(--ink);
  border-radius: 22px;
  box-shadow: 9px 9px 0 var(--ink);
}

.screen-shot:first-child {
  transform: rotate(-3deg) translateY(22px);
}

.screen-shot:last-child {
  transform: rotate(3deg) translateY(-18px);
}

.route-strip {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr 0.9fr;
  gap: 22px;
  align-items: stretch;
}

.route-intro {
  padding: 30px 32px;
  border: var(--line);
  background: var(--yellow);
  box-shadow: 7px 7px 0 var(--ink);
}

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

.route-shot {
  min-height: 310px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 22px;
  border: var(--line);
  background: var(--white);
}

.route-shot img {
  width: 175px;
  max-width: 400px;
  height: auto;
  border: 2px solid var(--ink);
}

.deep-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.deep-card {
  min-height: 270px;
  display: flex;
  flex-direction: column;
  padding: 30px;
  border: 2px solid var(--white);
  border-radius: var(--radius);
  background: #22252a;
}

.deep-card .tag {
  width: fit-content;
  margin-bottom: 48px;
  padding: 4px 9px;
  color: var(--ink);
  background: var(--teal);
  font-size: 0.74rem;
  font-weight: 950;
}

.deep-card:nth-child(2) .tag {
  background: var(--yellow);
}

.deep-card p {
  color: #d9d9d9;
}

.deep-card .text-link {
  width: fit-content;
  margin-top: auto;
  border-color: var(--coral);
}

.quote-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
}

.quote-card {
  min-height: 230px;
  padding: 28px;
  border: var(--line);
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: 6px 6px 0 var(--ink);
}

.quote-card blockquote {
  margin: 0 0 24px;
  font-size: 1.03rem;
  font-weight: 700;
}

.quote-card cite {
  color: var(--muted);
  font-size: 0.86rem;
  font-style: normal;
}

.stats-band {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 42px;
  border: var(--line);
  background: var(--teal);
}

.stat {
  padding: 24px;
  border-right: var(--line);
  text-align: center;
}

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

.stat strong {
  display: block;
  font-size: 1.8rem;
  font-weight: 950;
}

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

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

.faq-question {
  width: 100%;
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 0;
  border: 0;
  color: var(--ink);
  background: transparent;
  font: inherit;
  font-weight: 900;
  text-align: left;
  cursor: pointer;
}

.faq-question::after {
  content: "+";
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  display: grid;
  place-items: center;
  border: var(--line);
  border-radius: 50%;
  background: var(--white);
  font-size: 1.25rem;
}

.faq-question[aria-expanded="true"]::after {
  content: "−";
  background: var(--yellow);
}

.faq-answer {
  max-width: 880px;
  padding: 0 52px 22px 0;
  color: var(--muted);
}

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

.download-band {
  border-top: var(--line);
  border-bottom: var(--line);
  background: var(--coral);
}

.download-shell {
  width: min(calc(100% - 32px), var(--content));
  min-height: 250px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  padding: 42px 0;
}

.download-shell h2 {
  margin: 0;
  max-width: 640px;
}

.download-shell .button {
  flex: 0 0 auto;
  color: var(--ink);
  background: var(--yellow);
}

.site-footer {
  color: #d4d6d8;
  background: var(--ink);
}

.footer-shell {
  width: min(calc(100% - 32px), var(--content));
  margin: 0 auto;
  padding: 54px 0 28px;
}

.footer-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 40px;
  padding-bottom: 36px;
  border-bottom: 1px solid #42454a;
}

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

.footer-brand p {
  max-width: 520px;
  margin: 16px 0 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

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

.disclaimer {
  margin: 24px 0 0;
  color: #aeb1b5;
  font-size: 0.82rem;
}

.copyright {
  margin: 8px 0 0;
  color: #858990;
  font-size: 0.78rem;
}

.page-hero {
  border-bottom: var(--line);
  background: var(--yellow);
}

.page-hero .section-shell {
  min-height: 390px;
  display: grid;
  grid-template-columns: 1fr 260px;
  align-items: center;
  gap: 70px;
  padding: 64px 0;
}

.page-hero h1 {
  max-width: 850px;
  margin-bottom: 18px;
  font-size: 3.1rem;
}

.page-hero p {
  max-width: 760px;
  margin-bottom: 0;
  font-size: 1.04rem;
}

.page-mark {
  width: 210px;
  height: 210px;
  display: grid;
  place-items: center;
  justify-self: end;
  border: 3px solid var(--ink);
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 10px 10px 0 var(--ink);
  font-size: 4.4rem;
  font-weight: 950;
  transform: rotate(5deg);
}

.article-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 64px;
  align-items: start;
}

.article-nav {
  position: sticky;
  top: 106px;
  padding: 20px;
  border: var(--line);
  background: var(--white);
  box-shadow: 5px 5px 0 var(--ink);
}

.article-nav strong {
  display: block;
  margin-bottom: 12px;
}

.article-nav a {
  display: block;
  padding: 9px 0;
  border-top: 1px solid #d6d0c7;
  color: var(--muted);
  font-size: 0.9rem;
}

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

.article-body {
  min-width: 0;
}

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

.article-section + .article-section {
  padding-top: 58px;
  border-top: var(--line);
}

.article-section h2 {
  margin-bottom: 24px;
  font-size: 2rem;
}

.article-section > p,
.article-section li {
  color: #3f4349;
}

.step-list {
  display: grid;
  gap: 26px;
}

.step-card {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr);
  gap: 24px;
  padding: 26px;
  border: var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.step-index {
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  border: var(--line);
  border-radius: 50%;
  background: var(--coral);
  font-size: 1.35rem;
  font-weight: 950;
}

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

.notice {
  padding: 22px 24px;
  border-left: 8px solid var(--teal);
  background: #e6f8f4;
}

.notice strong {
  display: block;
  margin-bottom: 6px;
}

.check-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.check-list li {
  padding: 16px 18px 16px 48px;
  position: relative;
  border: var(--line);
  background: var(--white);
}

.check-list li::before {
  content: "✓";
  position: absolute;
  top: 16px;
  left: 18px;
  color: var(--coral-dark);
  font-weight: 950;
}

.feature-detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.feature-detail {
  min-height: 250px;
  padding: 26px;
  border: var(--line);
  background: var(--white);
  box-shadow: 5px 5px 0 var(--ink);
}

.feature-detail .label {
  width: fit-content;
  margin-bottom: 32px;
  padding: 4px 9px;
  background: var(--yellow);
  font-size: 0.76rem;
  font-weight: 950;
}

.feature-detail:nth-child(even) .label {
  background: var(--teal);
}

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

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

.support-table th,
.support-table td {
  padding: 16px;
  border: var(--line);
  text-align: left;
  vertical-align: top;
}

.support-table th {
  width: 28%;
  background: var(--yellow);
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 420ms ease, transform 420ms ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

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

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

@media (max-width: 980px) {
  .menu-toggle {
    display: inline-flex;
  }

  .nav-links {
    position: fixed;
    top: 76px;
    right: 0;
    left: 0;
    display: none;
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    padding: 18px 24px 26px;
    border-bottom: var(--line);
    background: var(--paper);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a:not(.button) {
    padding: 15px 0;
    border-bottom: 1px solid #d5cfc6;
  }

  .nav-links .button {
    margin-top: 16px;
  }

  .hero-shell {
    grid-template-columns: minmax(0, 1fr) minmax(300px, 0.74fr);
    gap: 34px;
  }

  h1 {
    font-size: 2.9rem;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .showcase-copy {
    max-width: 760px;
  }

  .route-strip {
    grid-template-columns: 1fr 1fr;
  }

  .route-intro {
    grid-column: 1 / -1;
  }

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

  .article-nav {
    position: static;
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 16px;
  }

  .article-nav strong {
    grid-column: 1 / -1;
  }
}

@media (max-width: 720px) {
  .section {
    padding: 64px 0;
  }

  .hero-shell {
    min-height: auto;
    grid-template-columns: 1fr;
    padding-top: 52px;
  }

  h1 {
    font-size: 2.35rem;
  }

  h2 {
    font-size: 1.85rem;
  }

  .phone-stage {
    min-height: 490px;
  }

  .phone-frame {
    width: 240px;
    margin-right: 42px;
  }

  .mini-frame {
    right: 8px;
    width: 140px;
  }

  .burst {
    right: 8px;
    width: 92px;
    height: 92px;
    font-size: 0.84rem;
  }

  .feature-grid,
  .deep-grid,
  .quote-grid,
  .stats-band,
  .feature-detail-grid,
  .check-list {
    grid-template-columns: 1fr;
  }

  .feature-item {
    min-height: 220px;
  }

  .screens-row {
    min-height: 470px;
    gap: 8px;
  }

  .screen-shot {
    width: 46%;
  }

  .route-strip {
    grid-template-columns: 1fr;
  }

  .route-intro {
    grid-column: auto;
  }

  .route-shot {
    min-height: 260px;
  }

  .download-shell,
  .footer-top {
    align-items: flex-start;
    flex-direction: column;
  }

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

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

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

  .page-hero .section-shell {
    min-height: 350px;
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .page-hero h1 {
    font-size: 2.25rem;
  }

  .page-mark {
    width: 124px;
    height: 124px;
    justify-self: start;
    font-size: 2.8rem;
  }

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

  .step-card {
    grid-template-columns: 1fr;
  }

  .support-table,
  .support-table tbody,
  .support-table tr,
  .support-table th,
  .support-table td {
    display: block;
    width: 100%;
  }
}

@media (max-width: 420px) {
  .nav-shell,
  .hero-shell,
  .section-shell,
  .download-shell,
  .footer-shell {
    width: min(calc(100% - 22px), var(--content));
  }

  .brand {
    font-size: 1.05rem;
  }

  .brand img {
    width: 40px;
    height: 40px;
  }

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

  .text-link {
    text-align: center;
  }

  .phone-frame {
    margin-right: 30px;
  }

  .mini-frame {
    width: 126px;
  }

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