:root {
  --ink: #17213b;
  --ink-soft: #44506a;
  --sky: #36bffa;
  --sky-dark: #168fc6;
  --leaf: #54d69d;
  --sun: #ffd45c;
  --paper: #f6fbfd;
  --white: #ffffff;
  --line: #dce8ee;
  --shadow: 0 18px 50px rgba(23, 33, 59, 0.1);
  --max: 1180px;
}

* {
  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;
  line-height: 1.75;
}

body.nav-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: 12px;
  left: 12px;
  z-index: 100;
  padding: 8px 14px;
  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(220, 232, 238, 0.82);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(16px);
}

.nav-wrap {
  display: flex;
  align-items: center;
  min-height: 76px;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex-shrink: 0;
  font-size: 20px;
  font-weight: 800;
}

.brand img {
  width: 44px;
  height: 44px;
  border-radius: 10px;
}

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

.site-nav a {
  position: relative;
  padding: 8px 0;
  font-size: 15px;
  font-weight: 650;
}

.site-nav a:not(.btn)::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 2px;
  background: var(--sky-dark);
  content: "";
  transform: scaleX(0);
  transition: transform 0.2s ease;
}

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

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  margin-left: auto;
  padding: 9px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 21px;
  height: 2px;
  margin: 4px auto;
  background: var(--ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  gap: 9px;
  border: 1px solid var(--ink);
  border-radius: 6px;
  color: var(--white);
  background: var(--ink);
  box-shadow: 0 8px 0 rgba(23, 33, 59, 0.12);
  font-weight: 750;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  box-shadow: 0 4px 0 rgba(23, 33, 59, 0.12);
  transform: translateY(2px);
}

.btn-sky {
  border-color: var(--sky-dark);
  color: #08293b;
  background: var(--sky);
}

.btn-light {
  border-color: rgba(255, 255, 255, 0.42);
  color: var(--white);
  background: transparent;
}

.btn svg {
  width: 19px;
  height: 19px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 660px;
  background: var(--paper);
}

.hero::before {
  position: absolute;
  top: 0;
  right: 0;
  width: 34%;
  height: 100%;
  background: var(--leaf);
  content: "";
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.82fr);
  align-items: center;
  min-height: 660px;
  gap: 70px;
  padding-block: 64px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  color: var(--sky-dark);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0;
}

.eyebrow::before {
  width: 28px;
  height: 3px;
  background: var(--sun);
  content: "";
}

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

h1,
h2,
h3 {
  line-height: 1.25;
  letter-spacing: 0;
}

h1 {
  max-width: 700px;
  margin-bottom: 24px;
  font-size: clamp(42px, 6vw, 76px);
}

.hero-lead {
  max-width: 650px;
  margin-bottom: 28px;
  color: var(--ink-soft);
  font-size: 18px;
}

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

.hero-notes {
  display: flex;
  flex-wrap: wrap;
  margin: 28px 0 0;
  padding: 0;
  gap: 14px 24px;
  list-style: none;
  color: var(--ink-soft);
  font-size: 14px;
}

.hero-notes li::before {
  margin-right: 7px;
  color: #16875c;
  content: "✓";
  font-weight: 900;
}

.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
}

.phone-stack {
  position: relative;
  width: min(100%, 470px);
  min-height: 520px;
}

.phone {
  position: absolute;
  width: 270px;
  max-width: 400px;
  overflow: hidden;
  border: 9px solid var(--ink);
  border-radius: 28px;
  background: var(--ink);
  box-shadow: var(--shadow);
}

.phone img {
  width: 100%;
  height: auto;
}

.phone-main {
  right: 16px;
  z-index: 2;
  transform: rotate(2deg);
}

.phone-back {
  top: 44px;
  left: 8px;
  z-index: 1;
  transform: rotate(-5deg) scale(0.88);
}

.hero-badge {
  position: absolute;
  right: -8px;
  bottom: 22px;
  z-index: 3;
  width: 138px;
  padding: 15px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--sun);
  box-shadow: 8px 8px 0 var(--ink);
  font-size: 13px;
  font-weight: 800;
  line-height: 1.45;
}

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

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

.trust-item {
  min-height: 112px;
  padding: 24px;
  border-right: 1px solid rgba(255, 255, 255, 0.14);
}

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

.trust-item strong {
  display: block;
  color: var(--sun);
  font-size: 24px;
}

.trust-item span {
  font-size: 13px;
  opacity: 0.74;
}

.section {
  padding-block: 92px;
}

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

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

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  margin-bottom: 42px;
  gap: 24px;
}

.section-head h2 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(30px, 4vw, 48px);
}

.section-kicker {
  color: var(--sky-dark);
  font-size: 13px;
  font-weight: 850;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--sky-dark);
  font-weight: 750;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.feature {
  grid-column: span 4;
  min-height: 250px;
  padding: 34px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

.feature-wide {
  grid-column: span 8;
  color: var(--white);
  background: var(--sky-dark);
}

.feature-number {
  display: block;
  margin-bottom: 38px;
  color: var(--sky-dark);
  font-size: 13px;
  font-weight: 900;
}

.feature-wide .feature-number {
  color: var(--sun);
}

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

.feature p {
  margin-bottom: 0;
  color: var(--ink-soft);
}

.feature-wide p {
  max-width: 580px;
  color: rgba(255, 255, 255, 0.84);
}

.showcase-layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 44px;
}

.showcase-copy {
  position: sticky;
  top: 112px;
  align-self: start;
}

.showcase-copy h2 {
  margin-bottom: 22px;
  font-size: 42px;
}

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

.showcase-copy li {
  padding: 14px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
}

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

.screen-shot {
  margin: 0;
}

.screen-shot img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border: 7px solid #0c1325;
  border-radius: 22px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.28);
}

.screen-shot:nth-child(2) {
  margin-top: 44px;
}

.screen-shot figcaption {
  padding-top: 12px;
  color: rgba(255, 255, 255, 0.72);
  font-size: 13px;
}

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

.journey-card {
  position: relative;
  min-height: 310px;
  padding: 30px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.journey-card:nth-child(2) {
  background: #e5f9f0;
}

.journey-card:nth-child(3) {
  background: #fff7d9;
}

.journey-card .index {
  display: block;
  margin-bottom: 62px;
  color: var(--sky-dark);
  font-size: 50px;
  font-weight: 900;
  line-height: 1;
}

.journey-card h3 {
  margin-bottom: 12px;
  font-size: 24px;
}

.review-layout {
  display: grid;
  grid-template-columns: 0.72fr 1.28fr;
  align-items: start;
  gap: 70px;
}

.rating-block {
  padding: 36px;
  border-left: 8px solid var(--sun);
  background: var(--paper);
}

.rating-block strong {
  display: block;
  font-size: 68px;
  line-height: 1;
}

.stars {
  color: #e7a900;
  letter-spacing: 0;
}

.quote-list {
  display: grid;
  gap: 18px;
}

blockquote {
  margin: 0;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  font-size: 17px;
}

blockquote footer {
  margin-top: 10px;
  color: var(--ink-soft);
  font-size: 13px;
}

.faq-preview {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.faq-preview article {
  min-height: 180px;
  padding: 28px;
  background: var(--white);
}

.faq-preview h3 {
  margin-bottom: 10px;
  font-size: 19px;
}

.download-band {
  overflow: hidden;
  padding-block: 72px;
  color: var(--ink);
  background: var(--sky);
}

.download-band-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 34px;
}

.download-band h2 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(30px, 5vw, 52px);
}

.site-footer {
  padding: 60px 0 28px;
  color: rgba(255, 255, 255, 0.76);
  background: #0d1426;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.6fr 0.8fr;
  gap: 60px;
}

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

.footer-brand p {
  max-width: 440px;
  margin-top: 20px;
}

.footer-links h3 {
  color: var(--white);
  font-size: 15px;
}

.footer-links a {
  display: block;
  padding: 5px 0;
  font-size: 14px;
}

.disclaimer {
  margin: 44px 0 0;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 12px;
}

.copyright {
  margin: 10px 0 0;
  font-size: 12px;
}

.sub-hero {
  position: relative;
  overflow: hidden;
  padding: 92px 0 72px;
  background: var(--paper);
}

.sub-hero::after {
  position: absolute;
  top: 0;
  right: 0;
  width: 16px;
  height: 100%;
  background: repeating-linear-gradient(180deg, var(--sky) 0 48px, var(--leaf) 48px 96px, var(--sun) 96px 144px);
  content: "";
}

.sub-hero h1 {
  max-width: 900px;
  margin-bottom: 18px;
  font-size: clamp(38px, 6vw, 68px);
}

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

.breadcrumb {
  display: flex;
  margin-bottom: 26px;
  padding: 0;
  gap: 8px;
  list-style: none;
  color: var(--ink-soft);
  font-size: 13px;
}

.breadcrumb li + li::before {
  margin-right: 8px;
  content: "/";
}

.article-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  align-items: start;
  gap: 62px;
}

.side-nav {
  position: sticky;
  top: 104px;
  padding: 20px;
  border-left: 4px solid var(--sky);
  background: var(--paper);
}

.side-nav strong {
  display: block;
  margin-bottom: 10px;
  font-size: 14px;
}

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

.article-content {
  max-width: 790px;
}

.article-content > section {
  scroll-margin-top: 110px;
  margin-bottom: 72px;
}

.article-content h2 {
  margin-bottom: 26px;
  padding-bottom: 14px;
  border-bottom: 3px solid var(--ink);
  font-size: 32px;
}

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

.step-list {
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  counter-reset: steps;
  list-style: none;
}

.step-list li {
  position: relative;
  min-height: 120px;
  padding: 24px 24px 24px 88px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  counter-increment: steps;
}

.step-list li::before {
  position: absolute;
  top: 24px;
  left: 24px;
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border-radius: 50%;
  color: var(--ink);
  background: var(--sun);
  content: counter(steps);
  font-weight: 900;
}

.step-list strong {
  display: block;
  margin-bottom: 5px;
  font-size: 18px;
}

.note-box {
  margin: 26px 0;
  padding: 22px 24px;
  border-left: 5px solid var(--leaf);
  background: #e9faf3;
}

.warning-box {
  border-left-color: #e4a900;
  background: #fff7d8;
}

.check-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.check-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 6px;
}

.check-item strong {
  display: block;
}

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

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

.accordion-button {
  display: grid;
  width: 100%;
  grid-template-columns: 34px 1fr 24px;
  align-items: center;
  padding: 22px 0;
  border: 0;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  font-family: inherit;
  font-size: 18px;
  font-weight: 750;
  text-align: left;
}

.accordion-button .number {
  color: var(--sky-dark);
  font-size: 13px;
}

.accordion-button .plus {
  font-size: 24px;
  font-weight: 400;
  transition: transform 0.2s ease;
}

.accordion-button[aria-expanded="true"] .plus {
  transform: rotate(45deg);
}

.accordion-panel {
  display: none;
  padding: 0 44px 24px 34px;
  color: var(--ink-soft);
}

.accordion-panel.is-open {
  display: block;
}

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

.function-blocks {
  display: grid;
  gap: 22px;
}

.function-block {
  display: grid;
  grid-template-columns: 170px 1fr;
  padding: 26px;
  gap: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.function-block h3 {
  margin: 0;
}

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

.related-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.related-link {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.related-link strong,
.related-link span {
  display: block;
}

.related-link span {
  margin-top: 5px;
  color: var(--ink-soft);
  font-size: 13px;
}

[data-reveal] {
  opacity: 1;
  transform: translateY(0);
  transition: transform 0.3s ease;
}

[data-reveal].visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 920px) {
  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    inset: 76px 0 auto;
    display: none;
    align-items: stretch;
    padding: 20px;
    gap: 6px;
    border-bottom: 1px solid var(--line);
    background: var(--white);
    box-shadow: var(--shadow);
  }

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

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

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .hero::before {
    top: auto;
    bottom: 0;
    width: 100%;
    height: 42%;
  }

  .hero-visual {
    min-height: 540px;
  }

  .feature {
    grid-column: span 6;
  }

  .feature-wide {
    grid-column: span 12;
  }

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

  .showcase-copy,
  .side-nav {
    position: static;
  }

  .review-layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }

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

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 680px) {
  .container {
    width: min(calc(100% - 28px), var(--max));
  }

  .brand {
    font-size: 17px;
  }

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

  h1 {
    font-size: 43px;
  }

  .hero-grid {
    padding-top: 50px;
  }

  .hero-lead,
  .sub-hero p {
    font-size: 16px;
  }

  .phone-stack {
    min-height: 455px;
  }

  .phone {
    width: min(66vw, 240px);
  }

  .phone-back {
    left: 0;
  }

  .phone-main {
    right: 0;
  }

  .hero-badge {
    right: 2px;
    bottom: 12px;
  }

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

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

  .trust-item:nth-child(-n + 2) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  }

  .section {
    padding-block: 68px;
  }

  .section-head {
    align-items: start;
    flex-direction: column;
    margin-bottom: 28px;
  }

  .feature {
    grid-column: span 12;
    min-height: 0;
  }

  .screenshots {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    padding-bottom: 16px;
  }

  .screen-shot {
    min-width: 76vw;
    scroll-snap-align: start;
  }

  .screen-shot:nth-child(2) {
    margin-top: 0;
  }

  .journey-grid,
  .faq-preview,
  .check-grid,
  .related-links {
    grid-template-columns: 1fr;
  }

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

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .footer-brand {
    grid-column: auto;
  }

  .sub-hero {
    padding: 64px 0 54px;
  }

  .sub-hero h1 {
    font-size: 40px;
  }

  .side-nav {
    display: flex;
    overflow-x: auto;
    gap: 16px;
    white-space: nowrap;
  }

  .side-nav strong {
    display: none;
  }

  .function-block {
    grid-template-columns: 1fr;
  }

  .accordion-button {
    grid-template-columns: 28px 1fr 22px;
    font-size: 16px;
  }

  .accordion-panel {
    padding-left: 28px;
  }
}

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

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