:root {
  --ink: #163b4b;
  --ink-soft: #41616d;
  --sky: #23a8c7;
  --leaf: #43b883;
  --coral: #ff6b5e;
  --paper: #f7fbf9;
  --white: #ffffff;
  --line: #d7e7e5;
  --night: #102a36;
  --shadow: 0 18px 44px rgba(16, 42, 54, 0.12);
}

* {
  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;
  font-size: 16px;
  line-height: 1.8;
}

body.menu-open {
  overflow: hidden;
}

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

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(215, 231, 229, 0.9);
  background: rgba(247, 251, 249, 0.96);
  backdrop-filter: blur(14px);
}

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

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

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

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  font-size: 15px;
  font-weight: 700;
}

.site-nav > a:not(.download-btn) {
  position: relative;
  padding: 21px 0;
}

.site-nav > a:not(.download-btn)::after {
  position: absolute;
  right: 0;
  bottom: 15px;
  left: 0;
  height: 2px;
  background: var(--coral);
  content: "";
  transform: scaleX(0);
  transition: transform 180ms ease;
}

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

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: var(--white);
  font-size: 24px;
  cursor: pointer;
}

.download-btn {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 10px 20px;
  border: 0;
  border-radius: 6px;
  color: var(--white);
  background: var(--coral);
  box-shadow: 0 10px 24px rgba(255, 107, 94, 0.24);
  font-weight: 800;
  line-height: 1.2;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.download-btn:hover {
  box-shadow: 0 14px 28px rgba(255, 107, 94, 0.32);
  transform: translateY(-2px);
}

.download-btn .icon {
  font-size: 20px;
  line-height: 1;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-bottom: 2px solid var(--sky);
  font-weight: 800;
}

.eyebrow {
  margin: 0 0 16px;
  color: var(--sky);
  font-size: 14px;
  font-weight: 900;
}

.hero {
  position: relative;
  min-height: 650px;
  overflow: hidden;
  background: var(--white);
}

.hero::before,
.hero::after {
  position: absolute;
  right: 0;
  left: 0;
  height: 1px;
  background: var(--line);
  content: "";
}

.hero::before {
  top: 28%;
}

.hero::after {
  top: 63%;
}

.hero-grid {
  position: relative;
  z-index: 2;
  min-height: 650px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 0.85fr);
  align-items: center;
  gap: 72px;
  padding: 54px 0 70px;
}

.hero-copy h1 {
  max-width: 650px;
  margin: 0 0 22px;
  color: var(--night);
  font-size: clamp(42px, 6vw, 76px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-copy .lead {
  max-width: 620px;
  margin: 0 0 28px;
  color: var(--ink-soft);
  font-size: 18px;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 30px;
}

.trust-row span {
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--ink-soft);
  background: var(--paper);
  font-size: 13px;
  font-weight: 700;
}

.hero-visual {
  position: relative;
  min-height: 530px;
  display: grid;
  place-items: center;
}

.hero-visual::before {
  position: absolute;
  width: 390px;
  height: 390px;
  border: 2px solid var(--sky);
  border-radius: 50%;
  content: "";
  opacity: 0.34;
}

.hero-visual::after {
  position: absolute;
  width: 470px;
  height: 150px;
  border-top: 14px solid var(--leaf);
  border-bottom: 14px solid var(--coral);
  content: "";
  opacity: 0.16;
  transform: rotate(-8deg);
}

.phone-frame {
  position: relative;
  z-index: 2;
  width: 292px;
  padding: 10px;
  border: 3px solid var(--night);
  border-radius: 26px;
  background: var(--night);
  box-shadow: var(--shadow);
  transform: rotate(3deg);
}

.phone-frame::before {
  position: absolute;
  top: 16px;
  left: 50%;
  width: 54px;
  height: 5px;
  border-radius: 4px;
  background: #62747b;
  content: "";
  transform: translateX(-50%);
}

.phone-frame img {
  width: 100%;
  max-width: 400px;
  border-radius: 16px;
}

.floating-note {
  position: absolute;
  z-index: 3;
  right: 0;
  bottom: 82px;
  width: 174px;
  padding: 14px 16px;
  border-left: 4px solid var(--coral);
  background: var(--white);
  box-shadow: var(--shadow);
  font-size: 14px;
  font-weight: 800;
  line-height: 1.5;
}

.signal-band {
  color: var(--white);
  background: var(--night);
}

.signal-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  min-height: 116px;
  align-items: center;
}

.signal-item {
  padding: 22px 28px;
  border-left: 1px solid rgba(255, 255, 255, 0.15);
}

.signal-item:last-child {
  border-right: 1px solid rgba(255, 255, 255, 0.15);
}

.signal-item strong {
  display: block;
  color: #83dfb7;
  font-size: 20px;
}

.signal-item span {
  color: #d8e7e8;
  font-size: 14px;
}

.section {
  padding: 92px 0;
}

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

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

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 38px;
}

.section-heading h2,
.section > .container > h2 {
  margin: 0;
  color: var(--night);
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.18;
  letter-spacing: 0;
}

.section-dark .section-heading h2,
.section-dark > .container > h2 {
  color: var(--white);
}

.section-index {
  color: var(--coral);
  font-size: 14px;
  font-weight: 900;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.feature-card {
  min-height: 270px;
  padding: 28px;
  border-top: 4px solid var(--sky);
  border-radius: 6px;
  background: var(--paper);
}

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

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

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

.feature-number {
  display: block;
  margin-bottom: 42px;
  color: var(--sky);
  font-size: 13px;
  font-weight: 900;
}

.feature-card h3 {
  margin: 0 0 12px;
  font-size: 21px;
}

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

.screenshot-rail {
  display: grid;
  grid-template-columns: repeat(5, minmax(210px, 1fr));
  gap: 22px;
  overflow-x: auto;
  padding: 6px 2px 24px;
  scrollbar-color: var(--sky) var(--line);
}

.screen-figure {
  min-width: 220px;
  margin: 0;
}

.screen-figure img {
  width: 100%;
  max-width: 300px;
  height: auto;
  border: 8px solid #26343d;
  border-radius: 24px;
  box-shadow: var(--shadow);
}

.screen-figure figcaption {
  padding: 14px 4px 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.content-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}

.content-link {
  position: relative;
  min-height: 260px;
  padding: 32px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  transition: border-color 180ms ease, transform 180ms ease;
}

.content-link:hover {
  border-color: var(--sky);
  transform: translateY(-3px);
}

.content-link .label {
  color: var(--coral);
  font-size: 13px;
  font-weight: 900;
}

.content-link h3 {
  max-width: 460px;
  margin: 42px 0 12px;
  font-size: 27px;
  line-height: 1.35;
}

.content-link p {
  max-width: 490px;
  margin: 0;
  color: var(--ink-soft);
}

.content-link .arrow {
  position: absolute;
  right: 28px;
  bottom: 22px;
  color: var(--sky);
  font-size: 34px;
}

.review-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr 1fr;
  gap: 18px;
}

.review {
  min-height: 230px;
  padding: 28px;
  border-radius: 6px;
  color: var(--ink);
  background: var(--white);
}

.review:first-child {
  background: #dff5ed;
}

.review .stars {
  color: var(--coral);
  font-size: 18px;
}

.review blockquote {
  margin: 24px 0 20px;
  font-size: 16px;
}

.review cite {
  color: var(--ink-soft);
  font-size: 13px;
  font-style: normal;
  font-weight: 800;
}

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

.faq-row {
  display: grid;
  grid-template-columns: 70px 1fr auto;
  align-items: center;
  gap: 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
}

.faq-row span {
  color: var(--coral);
  font-size: 13px;
  font-weight: 900;
}

.faq-row strong {
  font-size: 17px;
}

.faq-row a {
  color: var(--sky);
  font-weight: 800;
}

.bottom-cta {
  padding: 56px 0;
  color: var(--white);
  background: var(--sky);
}

.cta-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.cta-wrap h2 {
  margin: 0 0 8px;
  color: var(--white);
  font-size: clamp(28px, 4vw, 42px);
}

.cta-wrap p {
  margin: 0;
  color: #e8fbff;
}

.site-footer {
  padding: 48px 0 30px;
  color: #d6e2e5;
  background: var(--night);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 34px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  color: var(--white);
  font-size: 20px;
  font-weight: 900;
}

.footer-brand img {
  width: 40px;
  height: 40px;
  border-radius: 7px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-links strong {
  margin-bottom: 4px;
  color: var(--white);
}

.footer-note {
  margin: 0;
  color: #a8c0c7;
  font-size: 13px;
}

.copyright {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  color: #91abb3;
  font-size: 13px;
}

.page-hero {
  padding: 76px 0 66px;
  color: var(--white);
  background: var(--night);
}

.page-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  align-items: center;
  gap: 72px;
}

.page-hero h1 {
  max-width: 760px;
  margin: 0 0 20px;
  font-size: clamp(38px, 6vw, 66px);
  line-height: 1.12;
  letter-spacing: 0;
}

.page-hero p {
  max-width: 720px;
  margin: 0 0 24px;
  color: #c7dbdf;
  font-size: 18px;
}

.page-hero .mini-shot {
  width: 220px;
  max-width: 400px;
  margin: 0 auto;
  border: 7px solid #314954;
  border-radius: 22px;
  transform: rotate(4deg);
}

.article-layout {
  display: grid;
  grid-template-columns: 230px minmax(0, 1fr);
  align-items: start;
  gap: 62px;
}

.article-nav {
  position: sticky;
  top: 100px;
  padding: 20px 0;
  border-top: 3px solid var(--coral);
  border-bottom: 1px solid var(--line);
}

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

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

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

.article-content section {
  padding: 0 0 70px;
  scroll-margin-top: 100px;
}

.article-content h2 {
  margin: 0 0 24px;
  color: var(--night);
  font-size: 34px;
  line-height: 1.25;
}

.article-content h3 {
  margin: 28px 0 10px;
  color: var(--night);
  font-size: 21px;
}

.article-content p {
  margin: 0 0 16px;
  color: var(--ink-soft);
}

.step-list {
  counter-reset: guide-step;
}

.guide-step {
  position: relative;
  padding: 28px 28px 28px 88px;
  border-top: 1px solid var(--line);
  counter-increment: guide-step;
}

.guide-step::before {
  position: absolute;
  top: 28px;
  left: 20px;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: var(--white);
  background: var(--sky);
  content: counter(guide-step, decimal-leading-zero);
  font-size: 13px;
  font-weight: 900;
}

.guide-step h3 {
  margin-top: 0;
}

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

.info-strip {
  margin: 24px 0;
  padding: 18px 20px;
  border-left: 4px solid var(--leaf);
  color: var(--ink-soft);
  background: #e8f7f1;
}

.check-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.check-item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--white);
}

.check-item strong {
  display: block;
  margin-bottom: 5px;
}

.split-feature {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  align-items: center;
  gap: 44px;
  padding: 34px 0;
  border-top: 1px solid var(--line);
}

.split-feature:nth-child(even) .split-feature-copy {
  order: 2;
}

.split-feature:nth-child(even) img {
  order: 1;
}

.split-feature img {
  width: 240px;
  max-width: 400px;
  border: 7px solid #26343d;
  border-radius: 22px;
}

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

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

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

.faq-question {
  width: 100%;
  display: grid;
  grid-template-columns: 42px 1fr 24px;
  align-items: center;
  gap: 12px;
  padding: 20px 0;
  border: 0;
  color: var(--ink);
  background: transparent;
  font: inherit;
  font-weight: 800;
  text-align: left;
  cursor: pointer;
}

.faq-question .count {
  color: var(--coral);
  font-size: 13px;
}

.faq-question .plus {
  font-size: 22px;
  transition: transform 180ms ease;
}

.faq-item.is-open .plus {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 240ms ease;
}

.faq-answer p {
  margin: 0;
  padding: 0 36px 22px 54px;
}

.related-band {
  padding: 42px 0;
  border-top: 1px solid var(--line);
  background: var(--white);
}

.related-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.related-wrap strong {
  font-size: 20px;
}

@media (max-width: 960px) {
  .hero-grid {
    grid-template-columns: 1fr 340px;
    gap: 28px;
  }

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

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

  .signal-item:nth-child(3) {
    border-top: 1px solid rgba(255, 255, 255, 0.15);
  }

  .signal-item:nth-child(4) {
    border-top: 1px solid rgba(255, 255, 255, 0.15);
  }

  .article-layout {
    grid-template-columns: 1fr;
    gap: 34px;
  }

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

  .article-nav strong {
    width: 100%;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(100% - 28px, 680px);
  }

  .nav-wrap {
    min-height: 64px;
  }

  .brand {
    font-size: 18px;
  }

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

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

  .site-nav {
    position: fixed;
    top: 64px;
    right: 0;
    bottom: 0;
    left: 0;
    display: none;
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    padding: 24px;
    background: var(--paper);
  }

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

  .site-nav > a:not(.download-btn) {
    padding: 16px 4px;
    border-bottom: 1px solid var(--line);
  }

  .site-nav > a:not(.download-btn)::after {
    display: none;
  }

  .site-nav .download-btn {
    margin-top: 22px;
  }

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

  .hero-grid {
    grid-template-columns: 1fr;
    padding: 56px 0 70px;
  }

  .hero-copy h1 {
    font-size: 48px;
  }

  .hero-visual {
    min-height: 480px;
  }

  .hero-visual::before {
    width: 300px;
    height: 300px;
  }

  .hero-visual::after {
    width: 100%;
  }

  .floating-note {
    right: 2px;
    bottom: 34px;
  }

  .signal-grid,
  .feature-grid,
  .content-links,
  .review-grid,
  .footer-grid,
  .page-hero-grid,
  .check-grid {
    grid-template-columns: 1fr;
  }

  .signal-item {
    border-right: 1px solid rgba(255, 255, 255, 0.15);
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  }

  .section {
    padding: 68px 0;
  }

  .section-heading {
    align-items: start;
    flex-direction: column;
  }

  .page-hero {
    padding: 58px 0;
  }

  .page-hero .mini-shot {
    margin-top: 24px;
  }

  .split-feature,
  .split-feature:nth-child(even) {
    grid-template-columns: 1fr;
  }

  .split-feature:nth-child(even) .split-feature-copy,
  .split-feature:nth-child(even) img {
    order: initial;
  }

  .split-feature img {
    width: min(260px, 100%);
    margin: 0 auto;
  }

  .cta-wrap,
  .related-wrap {
    align-items: flex-start;
    flex-direction: column;
  }

  .faq-row {
    grid-template-columns: 44px 1fr;
  }

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

@media (max-width: 420px) {
  .hero-copy h1 {
    font-size: 40px;
  }

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

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

  .hero-actions .download-btn {
    width: 100%;
  }

  .phone-frame {
    width: min(270px, 86vw);
  }

  .floating-note {
    width: 150px;
  }

  .guide-step {
    padding: 76px 18px 24px;
  }

  .guide-step::before {
    top: 18px;
    left: 18px;
  }
}

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

  *,
  *::before,
  *::after {
    transition: none !important;
  }
}