:root {
  --ink: #17243a;
  --ink-soft: #526176;
  --paper: #ffffff;
  --mist: #f3f6f8;
  --coral: #ff5c57;
  --coral-dark: #d93f3b;
  --cyan: #17b6b2;
  --yellow: #ffd447;
  --line: #dce3e8;
  --shadow: 0 16px 40px rgba(23, 36, 58, 0.12);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0;
}

body.menu-open {
  overflow: hidden;
}

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

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: 1000;
  padding: 8px 12px;
  color: #fff;
  background: var(--ink);
  transform: translateY(-150%);
}

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

.container {
  width: min(1160px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 72px;
  border-bottom: 1px solid rgba(220, 227, 232, 0.86);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  font-size: 20px;
  font-weight: 800;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 6px;
}

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

.site-nav > a:not(.button) {
  padding: 9px 12px;
  border-bottom: 2px solid transparent;
  color: var(--ink-soft);
  font-size: 15px;
  font-weight: 700;
}

.site-nav > a:not(.button):hover,
.site-nav > a[aria-current="page"] {
  border-color: var(--coral);
  color: var(--ink);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: #fff;
  cursor: pointer;
}

.nav-toggle svg {
  width: 22px;
  height: 22px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 11px 20px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  color: #fff;
  background: var(--coral);
  box-shadow: 4px 4px 0 var(--ink);
  font-weight: 800;
  cursor: pointer;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

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

.button:focus-visible,
.nav-toggle:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: 3px;
}

.button svg {
  width: 18px;
  height: 18px;
  flex: 0 0 auto;
}

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

.button-secondary:hover {
  background: var(--mist);
}

.button-small {
  min-height: 40px;
  padding: 8px 14px;
  box-shadow: 3px 3px 0 var(--ink);
  font-size: 14px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 14px;
  color: var(--coral-dark);
  font-size: 13px;
  font-weight: 900;
}

.eyebrow::before {
  width: 24px;
  height: 4px;
  background: var(--coral);
  content: "";
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.22;
  letter-spacing: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: 52px;
}

h2 {
  margin-bottom: 28px;
  font-size: 34px;
}

h3 {
  margin-bottom: 10px;
  font-size: 20px;
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 650px;
  border-bottom: 1px solid var(--line);
  background-color: #fff;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 42px 42px;
}

.hero::before {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.86);
  content: "";
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.86fr);
  gap: 64px;
  align-items: center;
  min-height: 650px;
  padding-block: 54px;
}

.hero-copy > p:first-of-type {
  max-width: 660px;
  margin: 0 0 24px;
  color: var(--ink-soft);
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 26px;
}

.hero-proof {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 700;
}

.hero-proof li {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.hero-proof li::before {
  width: 9px;
  height: 9px;
  border: 2px solid var(--ink);
  background: var(--cyan);
  content: "";
}

.hero-media {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 520px;
}

.hero-screen {
  position: absolute;
  width: 210px;
  max-width: 400px;
  border: 7px solid var(--ink);
  border-radius: 28px;
  background: #fff;
  box-shadow: var(--shadow);
}

.hero-screen-main {
  z-index: 3;
  width: 236px;
}

.hero-screen-left {
  left: 12px;
  z-index: 1;
  transform: rotate(-7deg) translateY(10px);
}

.hero-screen-right {
  right: 4px;
  z-index: 2;
  transform: rotate(7deg) translateY(-4px);
}

.media-stamp {
  position: absolute;
  right: 6px;
  bottom: 42px;
  z-index: 5;
  width: 112px;
  padding: 11px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--yellow);
  box-shadow: 4px 4px 0 var(--ink);
  font-size: 13px;
  font-weight: 900;
  line-height: 1.35;
  text-align: center;
  transform: rotate(-4deg);
}

.signal-strip {
  border-bottom: 1px solid var(--line);
  background: var(--ink);
  color: #fff;
}

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

.signal-item {
  padding: 22px 24px;
  border-right: 1px solid rgba(255, 255, 255, 0.2);
}

.signal-item:last-child {
  border-right: 0;
}

.signal-item strong,
.signal-item span {
  display: block;
}

.signal-item strong {
  margin-bottom: 2px;
  color: var(--yellow);
  font-size: 22px;
}

.signal-item span {
  color: rgba(255, 255, 255, 0.78);
  font-size: 13px;
}

.section {
  padding-block: 88px;
}

.section-muted {
  border-block: 1px solid var(--line);
  background: var(--mist);
}

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

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 34px;
}

.section-heading h2 {
  margin: 0;
}

.section-heading .text-link {
  flex: 0 0 auto;
}

.text-link {
  color: var(--coral-dark);
  font-weight: 800;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 5px;
}

.screen-gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.screen-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}

.screen-card figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  margin: 0;
}

.screen-card .screen-stage {
  display: grid;
  place-items: center;
  width: 100%;
  min-height: 460px;
  padding: 28px;
  background: #e9f7f6;
}

.screen-card:nth-child(2) .screen-stage {
  background: #fff0ef;
}

.screen-card:nth-child(3) .screen-stage {
  background: #fff8d8;
}

.screen-card img {
  width: auto;
  max-width: min(100%, 400px);
  max-height: 404px;
  border: 5px solid var(--ink);
  border-radius: 20px;
  object-fit: contain;
  box-shadow: 8px 8px 0 rgba(23, 36, 58, 0.12);
}

.screen-card figcaption {
  width: 100%;
  padding: 20px 22px 22px;
}

.screen-card figcaption strong {
  display: block;
  margin-bottom: 6px;
  font-size: 18px;
}

.screen-card figcaption span {
  color: var(--ink-soft);
  font-size: 14px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.feature-item {
  min-height: 206px;
  padding: 30px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.feature-number {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  margin-bottom: 24px;
  border: 2px solid var(--ink);
  border-radius: 50%;
  color: var(--ink);
  background: var(--yellow);
  font-weight: 900;
}

.feature-item:nth-child(2) .feature-number,
.feature-item:nth-child(3) .feature-number {
  background: var(--cyan);
}

.feature-item:nth-child(4) .feature-number {
  color: #fff;
  background: var(--coral);
}

.feature-item p,
.topic-card p,
.review-card p {
  margin: 0;
  color: var(--ink-soft);
}

.route {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  counter-reset: route;
}

.route-step {
  position: relative;
  padding: 24px 24px 8px 0;
  counter-increment: route;
}

.route-step::before {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: 24px;
  border: 2px solid #fff;
  border-radius: 50%;
  color: var(--ink);
  background: var(--yellow);
  content: counter(route, decimal-leading-zero);
  font-weight: 900;
}

.route-step::after {
  position: absolute;
  top: 45px;
  left: 54px;
  width: calc(100% - 64px);
  height: 2px;
  background: rgba(255, 255, 255, 0.3);
  content: "";
}

.route-step:last-child::after {
  display: none;
}

.route-step p {
  margin: 0;
  color: rgba(255, 255, 255, 0.68);
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.topic-card {
  display: flex;
  gap: 22px;
  align-items: flex-start;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}

.topic-card .topic-mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 52px;
  height: 52px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--cyan);
  font-weight: 900;
}

.topic-card:nth-child(2) .topic-mark {
  background: var(--yellow);
}

.topic-card a {
  display: inline-block;
  margin-top: 14px;
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.review-card {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}

.review-card blockquote {
  margin: 0 0 20px;
  font-size: 17px;
  font-weight: 700;
}

.review-card footer {
  color: var(--ink-soft);
  font-size: 13px;
}

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

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

.faq-list summary {
  position: relative;
  padding: 22px 52px 22px 0;
  cursor: pointer;
  font-size: 18px;
  font-weight: 800;
  list-style: none;
}

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

.faq-list summary::after {
  position: absolute;
  top: 20px;
  right: 8px;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--ink);
  border-radius: 50%;
  content: "+";
}

.faq-list details[open] summary::after {
  content: "−";
}

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

.faq-answer p {
  margin: 0;
}

.download-band {
  overflow: hidden;
  padding-block: 62px;
  border-block: 1px solid var(--ink);
  background: var(--yellow);
}

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

.download-band h2 {
  margin-bottom: 8px;
}

.download-band p {
  margin: 0;
  color: #4f4a32;
}

.page-hero {
  border-bottom: 1px solid var(--line);
  background: var(--mist);
}

.page-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 70px;
  align-items: center;
  min-height: 410px;
  padding-block: 64px;
}

.page-hero h1 {
  max-width: 800px;
  font-size: 44px;
}

.page-hero p {
  max-width: 760px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 18px;
}

.page-index {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 2px solid var(--ink);
  background: #fff;
  box-shadow: 8px 8px 0 var(--cyan);
}

.page-index span {
  display: grid;
  place-items: center;
  min-height: 76px;
  padding: 10px;
  border-right: 1px solid var(--line);
  font-weight: 900;
  text-align: center;
}

.page-index span:last-child {
  border-right: 0;
}

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 270px;
  gap: 64px;
  align-items: start;
}

.article-content h2 {
  margin-top: 70px;
  padding-top: 8px;
  font-size: 30px;
}

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

.article-content h3 {
  margin-top: 28px;
}

.article-content p,
.article-content li {
  color: #3f4e62;
}

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

.article-content ul,
.article-content ol {
  padding-left: 22px;
}

.step-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.step-block {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 22px;
  padding: 30px 0;
  border-bottom: 1px solid var(--line);
}

.step-num {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border: 2px solid var(--ink);
  border-radius: 50%;
  background: var(--yellow);
  font-weight: 900;
}

.step-block:nth-child(even) .step-num {
  background: var(--cyan);
}

.step-block p {
  margin: 0;
}

.check-panel,
.notice-panel {
  margin-block: 28px;
  padding: 24px 26px;
  border-left: 5px solid var(--cyan);
  background: #e9f7f6;
}

.notice-panel {
  border-color: var(--coral);
  background: #fff0ef;
}

.check-panel h3,
.notice-panel h3 {
  margin: 0 0 10px;
}

.sticky-nav {
  position: sticky;
  top: 100px;
  border-left: 3px solid var(--coral);
  padding-left: 20px;
}

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

.sticky-nav a {
  display: block;
  padding: 7px 0;
  color: var(--ink-soft);
  font-size: 14px;
}

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

.feature-detail {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 28px;
  padding: 30px 0;
  border-top: 1px solid var(--line);
}

.feature-detail:last-child {
  border-bottom: 1px solid var(--line);
}

.feature-detail h3 {
  margin: 0;
}

.feature-detail p {
  margin: 0;
}

.site-footer {
  padding-block: 52px 30px;
  color: rgba(255, 255, 255, 0.76);
  background: #0e1828;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: start;
  padding-bottom: 34px;
}

.site-footer .brand {
  margin-bottom: 14px;
  color: #fff;
}

.footer-summary {
  max-width: 620px;
  margin: 0;
  font-size: 14px;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: 12px 26px;
}

.footer-links a {
  color: #fff;
  font-weight: 700;
}

.footer-bottom {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 30px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
  font-size: 12px;
}

.footer-bottom p {
  margin: 0;
}

.disclaimer {
  max-width: 760px;
}

.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 80;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 2px solid var(--ink);
  border-radius: 50%;
  color: var(--ink);
  background: var(--yellow);
  box-shadow: 3px 3px 0 var(--ink);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 160ms ease, transform 160ms ease;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}

@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1fr) 390px;
    gap: 24px;
  }

  .hero-screen {
    width: 180px;
  }

  .hero-screen-main {
    width: 210px;
  }

  .screen-card .screen-stage {
    min-height: 380px;
  }

  .screen-card img {
    max-height: 330px;
  }

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

  .sticky-nav {
    display: none;
  }
}

@media (max-width: 820px) {
  .site-header {
    height: 64px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: fixed;
    top: 64px;
    right: 0;
    left: 0;
    display: none;
    align-items: stretch;
    padding: 18px 20px 24px;
    border-bottom: 1px solid var(--line);
    background: #fff;
    box-shadow: var(--shadow);
  }

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

  .site-nav > a:not(.button) {
    padding: 12px 4px;
  }

  .site-nav .button {
    margin-top: 8px;
  }

  .hero,
  .hero-grid {
    min-height: 0;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    padding-block: 48px 38px;
  }

  .hero-copy {
    text-align: center;
  }

  .hero-copy > p:first-of-type {
    margin-inline: auto;
  }

  .hero-actions,
  .hero-proof {
    justify-content: center;
  }

  .hero-media {
    min-height: 330px;
  }

  .hero-screen {
    display: none;
  }

  .hero-screen-main {
    display: block;
    width: 184px;
  }

  .media-stamp {
    right: calc(50% - 150px);
    bottom: 28px;
  }

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

  .signal-item:nth-child(2) {
    border-right: 0;
  }

  .signal-item:nth-child(-n + 2) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  }

  .screen-gallery,
  .review-grid {
    grid-template-columns: 1fr;
  }

  .screen-card .screen-stage {
    min-height: 430px;
  }

  .screen-card img {
    max-height: 380px;
  }

  .page-hero-inner {
    grid-template-columns: 1fr;
    gap: 36px;
    min-height: 0;
  }

  .page-index {
    max-width: 340px;
  }
}

@media (max-width: 620px) {
  .container {
    width: min(100% - 28px, 1160px);
  }

  .brand {
    font-size: 18px;
  }

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

  h1 {
    font-size: 36px;
  }

  h2 {
    font-size: 28px;
  }

  .hero-copy > p:first-of-type,
  .page-hero p {
    font-size: 16px;
  }

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

  .hero-grid {
    padding-block: 36px 20px;
  }

  .hero-media {
    min-height: 150px;
  }

  .hero-screen-main {
    width: 88px;
  }

  .media-stamp {
    display: none;
  }

  .section {
    padding-block: 62px;
  }

  .section-heading {
    display: block;
  }

  .section-heading h2 {
    margin-bottom: 16px;
  }

  .signal-grid,
  .feature-grid,
  .topic-grid,
  .review-grid {
    grid-template-columns: 1fr;
  }

  .signal-item,
  .signal-item:nth-child(2) {
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  }

  .signal-item:last-child {
    border-bottom: 0;
  }

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

  .route-step {
    display: grid;
    grid-template-columns: 52px 1fr;
    gap: 18px;
    padding: 15px 0;
  }

  .route-step::before {
    width: 42px;
    height: 42px;
    margin: 0;
  }

  .route-step::after {
    top: 58px;
    left: 21px;
    width: 2px;
    height: calc(100% - 40px);
  }

  .route-step h3 {
    margin-bottom: 5px;
  }

  .topic-card {
    display: block;
  }

  .topic-mark {
    margin-bottom: 18px;
  }

  .download-band-inner,
  .footer-grid,
  .footer-bottom {
    display: block;
  }

  .download-band .button {
    width: 100%;
    margin-top: 24px;
  }

  .footer-links {
    grid-template-columns: 1fr;
    margin-top: 28px;
  }

  .footer-bottom .disclaimer {
    margin-bottom: 14px;
  }

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

  .page-index {
    grid-template-columns: 1fr;
    max-width: none;
  }

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

  .page-index span:last-child {
    border-bottom: 0;
  }

  .step-block,
  .feature-detail {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .article-content h2 {
    font-size: 26px;
  }
}

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

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