:root {
  --ink: #211d36;
  --ink-soft: #5f5a70;
  --paper: #f7f7fb;
  --white: #ffffff;
  --violet: #6b4eff;
  --violet-dark: #5038db;
  --coral: #ff6278;
  --cyan: #5dc8d7;
  --line: #dedce8;
  --shadow: 0 18px 48px rgba(33, 29, 54, 0.12);
  --radius: 8px;
  --content: 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;
  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;
}

.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);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(222, 220, 232, 0.86);
  background: rgba(247, 247, 251, 0.94);
  backdrop-filter: blur(14px);
}

.nav-shell {
  width: min(calc(100% - 40px), var(--content));
  min-height: 74px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.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: 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: 22px 0;
  color: var(--ink-soft);
}

.site-nav a:not(.download-btn)::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 16px;
  left: 0;
  height: 2px;
  background: var(--coral);
  transform: scaleX(0);
  transition: transform 180ms ease;
}

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

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

.download-btn,
.secondary-btn {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid var(--violet);
  border-radius: 6px;
  color: var(--white);
  background: var(--violet);
  box-shadow: 0 8px 20px rgba(107, 78, 255, 0.22);
  font-weight: 800;
  transition: transform 180ms ease, background 180ms ease;
}

.download-btn:hover,
.secondary-btn:hover {
  background: var(--violet-dark);
  transform: translateY(-2px);
}

.secondary-btn {
  border-color: var(--ink);
  color: var(--ink);
  background: transparent;
  box-shadow: none;
}

.secondary-btn:hover {
  color: var(--white);
  background: var(--ink);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  cursor: pointer;
}

.menu-toggle span,
.menu-toggle::before,
.menu-toggle::after {
  display: block;
  width: 20px;
  height: 2px;
  margin: 4px auto;
  background: var(--ink);
  content: "";
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 670px;
  color: var(--white);
  background: var(--ink);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.13;
  background-image: linear-gradient(rgba(255, 255, 255, 0.25) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.25) 1px, transparent 1px);
  background-size: 46px 46px;
}

.hero-shell {
  position: relative;
  width: min(calc(100% - 40px), var(--content));
  min-height: 670px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 0.92fr 1.08fr;
  align-items: center;
  gap: 78px;
  padding: 64px 0;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--cyan);
  font-size: 14px;
  font-weight: 800;
}

.hero h1 {
  max-width: 660px;
  margin: 0;
  font-size: clamp(44px, 6vw, 76px);
  line-height: 1.1;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 600px;
  margin: 24px 0 32px;
  color: #d7d4e1;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero .download-btn,
.hero .secondary-btn {
  min-width: 148px;
}

.hero .secondary-btn {
  border-color: #9c97ae;
  color: var(--white);
}

.hero-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 26px 0 0;
  padding: 0;
  color: #bdb8ce;
  font-size: 13px;
  list-style: none;
}

.hero-notes li::before {
  content: "•";
  margin-right: 8px;
  color: var(--coral);
}

.phone-stage {
  position: relative;
  min-height: 530px;
}

.phone {
  position: absolute;
  width: min(37vw, 270px);
  padding: 9px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 30px;
  background: #0f0d18;
  box-shadow: 0 32px 70px rgba(0, 0, 0, 0.45);
}

.phone img {
  width: 100%;
  max-width: 400px;
  border-radius: 22px;
}

.phone.front {
  z-index: 2;
  right: 12%;
  bottom: -90px;
}

.phone.back {
  top: -74px;
  left: 2%;
  transform: rotate(-6deg);
}

.section {
  padding: 96px 0;
}

.section.compact {
  padding: 68px 0;
}

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

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

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

.section-kicker {
  margin: 0 0 8px;
  color: var(--coral);
  font-size: 13px;
  font-weight: 900;
}

.section h2 {
  margin: 0 0 40px;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.25;
  letter-spacing: 0;
}

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

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

.feature-item {
  min-height: 210px;
  padding: 38px 30px;
  border-right: 1px solid var(--line);
}

.feature-item:first-child {
  border-left: 1px solid var(--line);
}

.feature-number {
  display: block;
  margin-bottom: 34px;
  color: var(--violet);
  font-family: Georgia, serif;
  font-size: 30px;
  font-weight: 700;
}

.feature-item h3 {
  margin: 0 0 8px;
  font-size: 20px;
}

.feature-item p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 22px;
}

.shot {
  margin: 0;
}

.shot-frame {
  overflow: hidden;
  max-width: 400px;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: var(--shadow);
}

.shot img {
  width: 100%;
  max-width: 400px;
  transition: transform 240ms ease;
}

.shot:hover img {
  transform: scale(1.018);
}

.shot figcaption {
  padding: 14px 2px 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.shot strong {
  display: block;
  color: var(--ink);
  font-size: 16px;
}

.journey {
  display: grid;
  grid-template-columns: 0.78fr 1.22fr;
  gap: 80px;
  align-items: start;
}

.journey-copy {
  position: sticky;
  top: 118px;
}

.journey-copy p,
.journey-copy .journey-intro {
  color: #c6c2d1;
}

.journey-list {
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.journey-step {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 22px;
  padding: 32px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}

.journey-step span {
  color: var(--coral);
  font-family: Georgia, serif;
  font-size: 28px;
}

.journey-step h3 {
  margin: 0 0 8px;
  font-size: 24px;
}

.journey-step p {
  margin: 0;
  color: #c6c2d1;
}

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

.deep-card {
  min-height: 330px;
  padding: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.deep-card:nth-child(2) {
  color: var(--white);
  border-color: var(--violet);
  background: var(--violet);
}

.deep-card .label {
  display: inline-block;
  margin-bottom: 70px;
  color: var(--coral);
  font-weight: 800;
}

.deep-card:nth-child(2) .label {
  color: #baf5ff;
}

.deep-card h3 {
  margin: 0 0 14px;
  font-size: 30px;
}

.deep-card p {
  margin: 0 0 24px;
  color: var(--ink-soft);
}

.deep-card:nth-child(2) p {
  color: #e5e1ff;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-bottom: 2px solid currentColor;
  font-weight: 900;
}

.review-grid {
  display: grid;
  grid-template-columns: 0.65fr 1.35fr;
  gap: 60px;
}

.score {
  font-family: Georgia, serif;
  font-size: 72px;
  font-weight: 700;
  line-height: 1;
}

.score-note {
  color: var(--ink-soft);
}

.quotes {
  display: grid;
  gap: 18px;
}

blockquote {
  margin: 0;
  padding: 24px 0 24px 28px;
  border-left: 4px solid var(--cyan);
  font-size: 18px;
}

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

.faq-list {
  max-width: 880px;
  margin: 0 auto;
  border-top: 1px solid var(--line);
}

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

summary {
  position: relative;
  padding: 24px 48px 24px 0;
  cursor: pointer;
  font-size: 18px;
  font-weight: 800;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  content: "+";
  position: absolute;
  top: 18px;
  right: 4px;
  color: var(--violet);
  font-size: 28px;
  font-weight: 400;
}

details[open] summary::after {
  content: "−";
}

.faq-answer {
  padding: 0 40px 24px 0;
  color: var(--ink-soft);
}

.faq-answer p {
  margin: 0 0 10px;
}

.cta-band {
  color: var(--white);
  background: var(--coral);
}

.cta-shell {
  min-height: 270px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.cta-shell h2 {
  max-width: 720px;
  margin: 0;
}

.cta-band .download-btn {
  min-width: 150px;
  border-color: var(--ink);
  color: var(--white);
  background: var(--ink);
  box-shadow: none;
}

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

.inner-hero .container {
  min-height: 400px;
  padding: 84px 0 72px;
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 70px;
  align-items: end;
}

.inner-hero h1 {
  max-width: 800px;
  margin: 0 0 20px;
  font-size: clamp(40px, 6vw, 68px);
  line-height: 1.12;
  letter-spacing: 0;
}

.inner-hero p {
  max-width: 700px;
  margin: 0;
  color: #c9c5d5;
  font-size: 18px;
}

.hero-index {
  display: grid;
  gap: 10px;
  padding: 22px;
  border-left: 3px solid var(--coral);
  background: rgba(255, 255, 255, 0.06);
}

.hero-index a {
  color: #ddd9e8;
  font-size: 14px;
}

.hero-index a:hover {
  color: var(--white);
}

.content-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 70px;
  align-items: start;
}

.prose {
  min-width: 0;
}

.prose section {
  padding: 0 0 60px;
  scroll-margin-top: 100px;
}

.prose h2 {
  margin: 0 0 26px;
  font-size: 32px;
}

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

.prose p {
  margin: 0 0 18px;
  color: #4f4a60;
}

.prose a:not(.download-btn) {
  color: var(--violet-dark);
  border-bottom: 1px solid currentColor;
  font-weight: 700;
}

.step-list {
  display: grid;
  gap: 18px;
  counter-reset: guide;
}

.step-card {
  position: relative;
  padding: 30px 30px 30px 92px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  counter-increment: guide;
}

.step-card::before {
  content: counter(guide, decimal-leading-zero);
  position: absolute;
  top: 26px;
  left: 28px;
  color: var(--coral);
  font-family: Georgia, serif;
  font-size: 28px;
  font-weight: 700;
}

.step-card h3 {
  margin: 0 0 8px;
}

.step-card p {
  margin: 0;
}

.check-grid,
.function-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.check-item,
.function-card {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.check-item strong,
.function-card strong {
  display: block;
  margin-bottom: 8px;
  color: var(--ink);
  font-size: 18px;
}

.check-item p,
.function-card p {
  margin: 0;
}

.inline-shot {
  display: grid;
  grid-template-columns: minmax(220px, 330px) 1fr;
  gap: 38px;
  align-items: center;
  margin: 28px 0;
}

.inline-shot img {
  width: 100%;
  max-width: 400px;
  border: 8px solid var(--white);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.side-nav {
  position: sticky;
  top: 106px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

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

.side-nav a {
  display: block;
  padding: 8px 0;
  color: var(--ink-soft);
  font-size: 14px;
}

.side-nav a:hover {
  color: var(--violet);
}

.notice {
  padding: 22px 24px;
  border-left: 4px solid var(--cyan);
  background: #edfafa;
}

.notice p {
  margin: 0;
  color: #375a5f;
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.related-links a {
  padding: 11px 16px;
  border: 1px solid var(--line) !important;
  border-radius: 6px;
  color: var(--ink) !important;
  background: var(--white);
}

.site-footer {
  padding: 56px 0 90px;
  color: #cbc7d6;
  background: #171422;
}

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

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

.footer-brand img {
  width: 40px;
  height: 40px;
  border-radius: 8px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 14px;
}

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

.disclaimer {
  max-width: 820px;
  margin: 26px 0 10px;
  color: #9892a8;
  font-size: 13px;
}

.copyright {
  margin: 0;
  color: #7f798e;
  font-size: 13px;
}

.mobile-download {
  display: none;
}

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

  .site-nav {
    position: fixed;
    top: 74px;
    right: 0;
    left: 0;
    display: none;
    padding: 24px 20px 30px;
    border-bottom: 1px solid var(--line);
    background: var(--paper);
    box-shadow: var(--shadow);
  }

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

  .site-nav a:not(.download-btn) {
    padding: 10px 0;
  }

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

  .hero-shell {
    grid-template-columns: 1fr 0.9fr;
    gap: 28px;
  }

  .phone.back {
    display: none;
  }

  .phone.front {
    right: 0;
    bottom: -40px;
    width: min(35vw, 260px);
  }

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

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

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

  .inner-hero .container {
    grid-template-columns: 1fr;
    gap: 34px;
  }

  .side-nav {
    display: none;
  }
}

@media (max-width: 640px) {
  .nav-shell,
  .container,
  .hero-shell {
    width: min(calc(100% - 28px), var(--content));
  }

  .hero,
  .hero-shell {
    min-height: 720px;
  }

  .hero-shell {
    display: block;
    padding: 62px 0 0;
  }

  .hero h1 {
    font-size: 44px;
  }

  .hero-copy {
    margin: 18px 0 24px;
    font-size: 16px;
  }

  .phone-stage {
    min-height: 305px;
    margin-top: 32px;
  }

  .phone.front {
    right: 5%;
    bottom: -186px;
    width: 186px;
  }

  .phone.back {
    display: block;
    top: 16px;
    left: 4%;
    width: 174px;
    transform: rotate(-4deg);
  }

  .section {
    padding: 70px 0;
  }

  .section h2 {
    margin-bottom: 30px;
  }

  .feature-grid,
  .gallery-grid,
  .deep-grid,
  .review-grid,
  .check-grid,
  .function-grid,
  .inline-shot,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .feature-item {
    min-height: auto;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    border-left: 1px solid var(--line);
  }

  .gallery-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .shot figcaption {
    font-size: 12px;
  }

  .shot strong {
    font-size: 14px;
  }

  .journey {
    gap: 26px;
  }

  .deep-card {
    min-height: 290px;
    padding: 30px;
  }

  .cta-shell {
    min-height: 310px;
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
  }

  .inner-hero .container {
    min-height: 430px;
    padding: 70px 0 50px;
  }

  .inner-hero h1 {
    font-size: 42px;
  }

  .step-card {
    padding: 78px 24px 24px;
  }

  .step-card::before {
    top: 20px;
    left: 24px;
  }

  .inline-shot {
    justify-items: center;
  }

  .footer-links {
    gap: 12px;
  }

  .mobile-download {
    position: fixed;
    right: 14px;
    bottom: 14px;
    left: 14px;
    z-index: 45;
    display: flex;
    min-height: 50px;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    color: var(--white);
    background: var(--violet);
    box-shadow: 0 12px 30px rgba(33, 29, 54, 0.35);
    font-weight: 900;
  }
}

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

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