:root {
  --ink: #121826;
  --muted: #5f6878;
  --line: #dfe5ec;
  --paper: #f6f8fb;
  --white: #ffffff;
  --blue: #1677ff;
  --blue-deep: #075dcc;
  --cyan: #25c9b7;
  --orange: #ff7a2f;
  --yellow: #ffd75a;
  --shadow: 0 18px 50px rgba(18, 24, 38, 0.12);
  --container: 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: 1.7;
}

body.menu-open {
  overflow: hidden;
}

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

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

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

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

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  border-bottom: 1px solid rgba(223, 229, 236, 0.86);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
}

.nav-shell {
  display: flex;
  min-height: 72px;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 900;
}

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

.nav-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.nav-links > a:not(.button) {
  padding: 9px 13px;
  color: #3f4858;
  font-size: 15px;
  font-weight: 700;
}

.nav-links > a:not(.button):hover,
.nav-links > a[aria-current="page"]:not(.button) {
  color: var(--blue-deep);
}

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

.menu-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  margin: 4px 0;
  background: var(--ink);
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: var(--blue);
  color: var(--white);
  font-weight: 800;
  line-height: 1;
  box-shadow: 0 10px 24px rgba(22, 119, 255, 0.22);
  transition: transform 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
  background: var(--blue-deep);
  box-shadow: 0 14px 28px rgba(22, 119, 255, 0.28);
}

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

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

.hero {
  position: relative;
  overflow: hidden;
  min-height: 700px;
  background:
    linear-gradient(90deg, rgba(18, 24, 38, 0.035) 1px, transparent 1px),
    linear-gradient(rgba(18, 24, 38, 0.035) 1px, transparent 1px),
    var(--paper);
  background-size: 32px 32px;
}

.hero::before {
  position: absolute;
  top: 86px;
  right: -120px;
  width: 520px;
  height: 260px;
  border: 26px solid var(--yellow);
  border-right: 0;
  content: "";
  transform: rotate(-9deg);
}

.hero-grid {
  position: relative;
  display: grid;
  min-height: 700px;
  grid-template-columns: minmax(0, 1.02fr) minmax(380px, 0.98fr);
  align-items: center;
  gap: 70px;
  padding: 76px 0 66px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 18px;
  color: var(--blue-deep);
  font-size: 14px;
  font-weight: 900;
}

.eyebrow::before {
  width: 28px;
  height: 5px;
  background: var(--orange);
  content: "";
}

.hero h1 {
  max-width: 620px;
  margin: 0 0 22px;
  font-size: clamp(48px, 7vw, 82px);
  line-height: 1.04;
  letter-spacing: 0;
}

.hero h1 + p {
  max-width: 630px;
  margin: 0;
  color: #454f60;
  font-size: 18px;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 30px;
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
}

.trust-row li {
  display: grid;
  gap: 1px;
}

.trust-row strong {
  font-size: 21px;
}

.trust-row span {
  color: var(--muted);
  font-size: 13px;
}

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

.phone-frame {
  position: relative;
  z-index: 2;
  width: min(330px, 76vw);
  padding: 10px;
  border: 8px solid var(--ink);
  border-radius: 34px;
  background: var(--ink);
  box-shadow: var(--shadow);
  transform: rotate(2deg);
}

.phone-frame::before {
  position: absolute;
  z-index: 3;
  top: 5px;
  left: 50%;
  width: 84px;
  height: 18px;
  border-radius: 0 0 12px 12px;
  background: var(--ink);
  content: "";
  transform: translateX(-50%);
}

.phone-frame img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: 20px;
}

.visual-tag {
  position: absolute;
  z-index: 4;
  right: 0;
  bottom: 76px;
  max-width: 190px;
  padding: 14px 16px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--cyan);
  font-size: 14px;
  font-weight: 900;
  box-shadow: 8px 8px 0 var(--ink);
}

.section {
  padding: 92px 0;
}

.section.alt {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

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

.section-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 30px;
  margin-bottom: 38px;
}

.section-heading h2,
.content-section h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 46px);
  line-height: 1.2;
  letter-spacing: 0;
}

.section-index {
  flex: 0 0 auto;
  color: var(--orange);
  font-size: 15px;
  font-weight: 900;
}

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

.feature-card {
  min-height: 240px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.feature-card:nth-child(2) {
  border-top: 5px solid var(--orange);
}

.feature-card:nth-child(3) {
  border-top: 5px solid var(--cyan);
}

.feature-card:nth-child(4) {
  border-top: 5px solid var(--yellow);
}

.feature-number {
  display: inline-grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 50%;
  background: var(--ink);
  color: var(--white);
  font-size: 13px;
  font-weight: 900;
}

.feature-card h3 {
  margin: 22px 0 10px;
  font-size: 21px;
}

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

.shot-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.shot {
  margin: 0;
}

.shot-image {
  overflow: hidden;
  aspect-ratio: 9 / 16;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #eef2f6;
}

.shot img {
  width: 100%;
  max-width: 400px;
  height: 100%;
  object-fit: cover;
  transition: transform 260ms ease;
}

.shot:hover img {
  transform: scale(1.025);
}

.shot figcaption {
  padding: 12px 2px 0;
  font-size: 14px;
  font-weight: 800;
}

.flow-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid rgba(255, 255, 255, 0.22);
}

.flow-step {
  position: relative;
  padding: 34px 34px 10px 0;
}

.flow-step:not(:last-child) {
  border-right: 1px solid rgba(255, 255, 255, 0.22);
  margin-right: 34px;
}

.flow-step span {
  color: var(--yellow);
  font-size: 13px;
  font-weight: 900;
}

.flow-step h3 {
  margin: 10px 0;
  font-size: 26px;
}

.flow-step p {
  margin: 0;
  color: #bfc7d3;
}

.deep-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.deep-card {
  position: relative;
  min-height: 290px;
  padding: 34px;
  overflow: hidden;
  border: 2px solid var(--ink);
  border-radius: 8px;
  background: var(--white);
}

.deep-card:first-child {
  background: var(--yellow);
}

.deep-card:last-child {
  background: var(--cyan);
}

.deep-card::after {
  position: absolute;
  right: -28px;
  bottom: -52px;
  color: rgba(18, 24, 38, 0.13);
  content: attr(data-mark);
  font-size: 170px;
  font-weight: 900;
  line-height: 1;
}

.deep-card h3 {
  position: relative;
  z-index: 1;
  max-width: 420px;
  margin: 0 0 14px;
  font-size: 30px;
}

.deep-card p {
  position: relative;
  z-index: 1;
  max-width: 470px;
  margin: 0 0 26px;
}

.text-link {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  border-bottom: 2px solid currentColor;
  font-weight: 900;
}

.review-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.9fr 0.9fr;
  gap: 16px;
}

.review {
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.review blockquote {
  margin: 0 0 22px;
  font-size: 16px;
}

.review:first-child blockquote {
  font-size: 20px;
}

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

.faq-list {
  display: grid;
  gap: 10px;
}

.faq-list details {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.faq-list summary {
  display: flex;
  min-height: 58px;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 18px;
  cursor: pointer;
  font-weight: 800;
  list-style: none;
}

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

.faq-list summary::after {
  flex: 0 0 auto;
  content: "+";
  color: var(--blue);
  font-size: 24px;
  line-height: 1;
}

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

.faq-list details p {
  margin: 0;
  padding: 0 18px 18px;
  color: var(--muted);
}

.download-band {
  background: var(--blue);
  color: var(--white);
}

.download-shell {
  display: flex;
  min-height: 250px;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 48px 0;
}

.download-shell h2 {
  max-width: 690px;
  margin: 0 0 12px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.2;
}

.download-shell p {
  margin: 0;
  color: #dbeaff;
}

.download-shell .button {
  flex: 0 0 auto;
  background: var(--yellow);
  color: var(--ink);
  box-shadow: 8px 8px 0 var(--ink);
}

.page-hero {
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(90deg, rgba(18, 24, 38, 0.04) 1px, transparent 1px),
    var(--paper);
  background-size: 30px 30px;
}

.page-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(300px, 0.65fr);
  align-items: center;
  gap: 70px;
  padding: 76px 0;
}

.page-hero h1 {
  max-width: 780px;
  margin: 0 0 20px;
  font-size: clamp(40px, 5vw, 64px);
  line-height: 1.12;
  letter-spacing: 0;
}

.page-hero p {
  max-width: 720px;
  margin: 0;
  color: var(--muted);
  font-size: 17px;
}

.page-hero img {
  width: min(100%, 310px);
  max-width: 400px;
  margin: 0 auto;
  border: 7px solid var(--ink);
  border-radius: 26px;
  box-shadow: 12px 12px 0 var(--orange);
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 270px;
  align-items: start;
  gap: 70px;
  padding: 80px 0 96px;
}

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

.content-section {
  padding: 0 0 62px;
}

.content-section + .content-section {
  padding-top: 62px;
  border-top: 1px solid var(--line);
}

.content-section h2 {
  margin-bottom: 26px;
  font-size: 34px;
}

.content-section h3 {
  margin: 30px 0 8px;
  font-size: 22px;
}

.content-section p {
  margin: 0 0 16px;
  color: #434d5d;
}

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

.step-list li {
  position: relative;
  padding: 24px 24px 24px 82px;
  border: 1px solid var(--line);
  border-radius: 8px;
  counter-increment: guide-step;
}

.step-list li::before {
  position: absolute;
  top: 24px;
  left: 24px;
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: 50%;
  background: var(--ink);
  color: var(--white);
  content: counter(guide-step, decimal-leading-zero);
  font-size: 12px;
  font-weight: 900;
}

.step-list h3 {
  margin: 0 0 8px;
  font-size: 20px;
}

.step-list p {
  margin: 0;
}

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

.check-item {
  padding: 20px;
  border-left: 5px solid var(--cyan);
  background: var(--paper);
}

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

.check-item p {
  margin: 0;
  font-size: 14px;
}

.article-aside {
  position: sticky;
  top: 98px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.article-aside strong {
  display: block;
  margin-bottom: 10px;
}

.article-aside a:not(.button) {
  display: block;
  padding: 8px 0;
  color: var(--muted);
  font-size: 14px;
}

.article-aside .button {
  width: 100%;
  margin-top: 16px;
}

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

.feature-detail {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.feature-detail h3 {
  margin: 0 0 8px;
}

.feature-detail p {
  margin: 0;
}

.notice {
  padding: 22px;
  border: 1px solid #f1c21b;
  border-left-width: 6px;
  border-radius: 6px;
  background: #fff9db;
}

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

.site-footer {
  padding: 46px 0 26px;
  background: #0b101a;
  color: #b8c1cf;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 50px;
  padding-bottom: 32px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  color: var(--white);
  font-size: 20px;
  font-weight: 900;
}

.footer-brand img {
  width: 38px;
  height: 38px;
  border-radius: 7px;
}

.site-footer p {
  margin: 0;
  font-size: 13px;
}

.footer-links strong {
  display: block;
  margin-bottom: 10px;
  color: var(--white);
}

.footer-links a {
  display: block;
  padding: 4px 0;
  font-size: 14px;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 500ms ease, transform 500ms ease;
}

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media (max-width: 980px) {
  .feature-grid,
  .shot-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-grid {
    grid-template-columns: 1fr 0.78fr;
    gap: 34px;
  }

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

  .review:first-child {
    grid-column: 1 / -1;
  }

  .article-layout {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .article-aside {
    position: static;
    order: -1;
  }
}

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

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

  .menu-toggle {
    display: block;
  }

  .nav-links {
    position: fixed;
    top: 64px;
    right: 0;
    left: 0;
    display: none;
    align-items: stretch;
    padding: 16px 20px 24px;
    border-bottom: 1px solid var(--line);
    background: var(--white);
    box-shadow: var(--shadow);
  }

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

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

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

  .hero-grid,
  .page-hero-grid {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    gap: 42px;
    padding: 58px 0 64px;
  }

  .hero h1 {
    font-size: 52px;
  }

  .hero h1 + p {
    font-size: 16px;
  }

  .hero-visual {
    min-height: 460px;
  }

  .visual-tag {
    right: 4px;
  }

  .section {
    padding: 68px 0;
  }

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

  .flow-grid,
  .deep-links,
  .footer-grid,
  .feature-detail-grid,
  .check-grid {
    grid-template-columns: 1fr;
  }

  .flow-step:not(:last-child) {
    margin-right: 0;
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.22);
    padding-bottom: 30px;
  }

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

  .page-hero-grid {
    gap: 42px;
    padding: 58px 0 70px;
  }

  .article-layout {
    padding: 58px 0 72px;
  }

  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 520px) {
  .brand {
    font-size: 18px;
  }

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

  .hero h1 {
    margin-bottom: 14px;
    font-size: 42px;
  }

  .feature-grid,
  .shot-strip,
  .review-grid {
    grid-template-columns: 1fr;
  }

  .review:first-child {
    grid-column: auto;
  }

  .shot-strip {
    width: min(100%, 330px);
    margin: 0 auto;
  }

  .hero-grid {
    gap: 16px;
    padding: 42px 0 24px;
  }

  .hero h1 + p {
    font-size: 15px;
    line-height: 1.7;
  }

  .hero-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    margin-top: 20px;
  }

  .hero-actions .button {
    width: auto;
    padding: 0 12px;
  }

  .trust-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 22px;
  }

  .trust-row strong {
    font-size: 18px;
  }

  .trust-row span {
    font-size: 11px;
  }

  .hero-visual {
    min-height: 190px;
    align-items: flex-start;
    justify-content: flex-end;
    padding-right: 28px;
  }

  .phone-frame {
    width: 126px;
    padding: 4px;
    border-width: 4px;
    border-radius: 18px;
  }

  .phone-frame::before {
    top: 1px;
    width: 44px;
    height: 9px;
    border-radius: 0 0 6px 6px;
  }

  .phone-frame img {
    border-radius: 10px;
  }

  .visual-tag {
    right: auto;
    bottom: 36px;
    left: 8px;
    max-width: 185px;
    padding: 10px 12px;
    font-size: 12px;
    box-shadow: 5px 5px 0 var(--ink);
  }

  .section {
    padding: 48px 0;
  }

  .step-list li {
    padding: 76px 20px 22px;
  }

  .step-list li::before {
    top: 20px;
    left: 20px;
  }
}