:root {
  --blue: #0a66df;
  --blue-dark: #084ca8;
  --blue-soft: #eaf3ff;
  --ink: #101828;
  --muted: #5c6678;
  --line: #dce4ee;
  --surface: #f5f7fa;
  --white: #ffffff;
  --green: #13795b;
  --black: #161616;
  --yellow: #ffe968;
  --shadow: 0 16px 48px rgba(16, 40, 80, 0.12);
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  min-width: 320px;
  background: var(--white);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
}

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

button {
  font: inherit;
}

:focus-visible {
  outline: 3px solid var(--yellow);
  outline-offset: 3px;
}

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

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 1000;
  padding: 10px 14px;
  border-radius: 6px;
  background: var(--black);
  color: var(--white);
  text-decoration: none;
  transform: translateY(-160%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 72px;
  border-bottom: 1px solid rgba(220, 228, 238, 0.86);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: var(--ink);
  font-size: 18px;
  font-weight: 750;
  text-decoration: none;
  white-space: nowrap;
}

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

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

.main-nav a,
.footer-links a {
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
}

.main-nav a:hover,
.footer-links a:hover {
  color: var(--blue);
}

.header-download {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 104px;
  min-height: 42px;
  padding: 0 18px;
  border-radius: 7px;
  background: var(--blue);
  color: var(--white);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.header-download:hover {
  background: var(--blue-dark);
}

.hero-section {
  position: relative;
  min-height: 580px;
  overflow: hidden;
  background: var(--blue);
  color: var(--white);
}

.hero-visual {
  position: absolute;
  inset: 0 0 0 auto;
  width: min(49vw, 690px);
  overflow: hidden;
  background: #0877f2;
}

.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(10, 102, 223, 0.12);
}

.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 24%;
}

.hero-content {
  position: relative;
  z-index: 2;
  min-height: 580px;
  display: flex;
  align-items: center;
  padding-block: 54px;
}

.hero-copy {
  width: min(590px, 54%);
}

.hero-brandline {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.hero-brandline img {
  border: 1px solid rgba(255, 255, 255, 0.45);
  border-radius: 18px;
  box-shadow: 0 12px 28px rgba(0, 38, 102, 0.24);
}

.hero-brandline span {
  padding: 6px 10px;
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  font-size: 13px;
  font-weight: 650;
}

.eyebrow,
.section-label {
  margin: 0 0 10px;
  color: var(--yellow);
  font-size: 14px;
  font-weight: 750;
}

.hero-copy h1 {
  margin: 0;
  font-size: 58px;
  line-height: 1.1;
  letter-spacing: 0;
}

.hero-description {
  max-width: 570px;
  margin: 20px 0 26px;
  color: rgba(255, 255, 255, 0.9);
  font-size: 18px;
  line-height: 1.75;
}

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

.download-button {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 750;
  text-decoration: none;
  white-space: nowrap;
  transition: transform 160ms ease, background-color 160ms ease, box-shadow 160ms ease;
}

.download-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(0, 24, 72, 0.22);
}

.download-button img {
  object-fit: contain;
}

.download-button.apple {
  background: var(--black);
  color: var(--white);
}

.download-button.android {
  background: var(--green);
  color: var(--white);
}

.download-button.backup {
  border-color: rgba(255, 255, 255, 0.62);
  background: rgba(255, 255, 255, 0.1);
  color: var(--white);
}

.hero-note {
  margin: 18px 0 0;
  color: rgba(255, 255, 255, 0.68);
  font-size: 12px;
}

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

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

.proof-grid div {
  min-height: 112px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 22px 30px;
  border-left: 1px solid var(--line);
}

.proof-grid div:last-child {
  border-right: 1px solid var(--line);
}

.proof-grid strong {
  color: var(--blue);
  font-size: 22px;
  line-height: 1.3;
}

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

.section {
  padding-block: 96px;
}

.section-label {
  color: var(--blue);
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 42px;
}

.section-heading h2 {
  max-width: 720px;
  margin: 0;
  font-size: 38px;
  line-height: 1.25;
  letter-spacing: 0;
}

.section-heading p {
  max-width: 410px;
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.feature-list article {
  min-height: 220px;
  padding: 30px 26px 28px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.feature-index {
  display: block;
  margin-bottom: 28px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
}

.feature-list h3 {
  margin: 0 0 10px;
  font-size: 20px;
}

.feature-list p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.screenshots-section {
  background: var(--surface);
}

.screenshot-gallery {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: center;
  gap: 20px;
  padding: 4px;
}

.screenshot-gallery figure {
  flex: 0 1 calc((100% - 40px) / 3);
  min-width: 0;
  max-width: 380px;
  margin: 0;
  padding: 8px 8px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 12px 34px rgba(32, 57, 92, 0.08);
}

.screenshot-gallery img {
  width: 100%;
  height: auto;
  border-radius: 6px;
  object-fit: contain;
}

.screenshot-gallery figcaption {
  padding: 11px 4px 0;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
  text-align: center;
}

.download-section {
  background: #eef5ff;
}

.download-heading {
  margin-bottom: 32px;
}

.download-options {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.download-option {
  min-height: 112px;
  display: grid;
  grid-template-columns: 44px 1fr 24px;
  align-items: center;
  gap: 16px;
  padding: 24px;
  border: 1px solid transparent;
  border-radius: 8px;
  text-decoration: none;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.download-option:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.download-option > img {
  width: 42px;
  height: 42px;
  object-fit: contain;
}

.download-option span {
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.download-option strong {
  font-size: 17px;
}

.download-option small {
  margin-top: 3px;
  font-size: 12px;
  opacity: 0.72;
}

.download-option b {
  font-size: 20px;
  text-align: right;
}

.apple-option {
  background: var(--black);
  color: var(--white);
}

.android-option {
  background: var(--green);
  color: var(--white);
}

.backup-option {
  border-color: #b6c9e5;
  background: var(--white);
  color: var(--blue-dark);
}

.support-section {
  padding-bottom: 76px;
}

.contact-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.contact-item {
  min-width: 0;
  min-height: 160px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 24px 30px;
  border-right: 1px solid var(--line);
  color: var(--ink);
  text-decoration: none;
}

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

.contact-item > span {
  color: var(--muted);
  font-size: 13px;
}

.contact-item strong {
  max-width: 100%;
  margin-top: 6px;
  font-size: 18px;
  word-break: break-all;
}

.contact-item small,
.copy-button {
  margin-top: 12px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
}

.copy-button {
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.copy-status {
  min-height: 24px;
  margin: 12px 0 0;
  color: var(--green);
  font-size: 13px;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.footer-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 32px;
  min-height: 132px;
  padding-block: 28px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 750;
  white-space: nowrap;
}

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

.footer-links {
  display: flex;
  justify-content: center;
  gap: 22px;
}

.footer-legal {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  color: var(--muted);
  font-size: 12px;
}

.footer-legal a {
  margin-top: 4px;
  text-decoration: none;
}

.footer-legal a:hover {
  color: var(--blue);
}

.legal-main {
  min-height: calc(100vh - 204px);
  background: var(--surface);
  padding-block: 64px 88px;
}

.legal-document {
  width: min(calc(100% - 40px), 860px);
  margin-inline: auto;
  padding: 48px 56px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.legal-back {
  display: inline-flex;
  margin-bottom: 24px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.legal-document h1 {
  margin: 0;
  font-size: 36px;
  line-height: 1.3;
}

.legal-updated {
  margin: 8px 0 34px;
  color: var(--muted);
  font-size: 13px;
}

.legal-document h2 {
  margin: 38px 0 12px;
  font-size: 22px;
}

.legal-document p,
.legal-document li {
  color: #374151;
  font-size: 15px;
  line-height: 1.9;
}

.legal-document ol,
.legal-document ul {
  padding-left: 24px;
}

.legal-contact {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

@media (max-width: 980px) {
  .hero-visual {
    inset: 0;
    width: 100%;
    opacity: 0.2;
  }

  .hero-visual::after {
    background: rgba(10, 102, 223, 0.42);
  }

  .hero-copy {
    width: min(650px, 100%);
  }

  .feature-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .screenshot-gallery figure {
    flex-basis: calc((100% - 20px) / 2);
    max-width: 360px;
  }

  .download-options {
    grid-template-columns: 1fr;
  }

  .download-option {
    min-height: 96px;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .footer-links {
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .footer-legal {
    align-items: flex-start;
  }
}

@media (max-width: 720px) {
  .container {
    width: min(calc(100% - 28px), var(--container));
  }

  .site-header {
    height: 64px;
  }

  .header-inner {
    gap: 14px;
  }

  .brand {
    font-size: 16px;
  }

  .brand img {
    width: 36px;
    height: 36px;
  }

  .main-nav {
    display: none;
  }

  .header-download {
    min-width: 90px;
    min-height: 38px;
    margin-left: auto;
    padding-inline: 14px;
  }

  .hero-section,
  .hero-content {
    min-height: 558px;
  }

  .hero-content {
    align-items: flex-start;
    padding-block: 38px 34px;
  }

  .hero-brandline {
    margin-bottom: 14px;
  }

  .hero-brandline img {
    width: 58px;
    height: 58px;
    border-radius: 14px;
  }

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

  .hero-description {
    margin-block: 14px 18px;
    font-size: 16px;
    line-height: 1.65;
  }

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

  .download-button {
    width: 100%;
    min-height: 48px;
    padding-inline: 12px;
    font-size: 14px;
  }

  .download-button.backup {
    grid-column: 1 / -1;
  }

  .hero-note {
    margin-top: 12px;
  }

  .proof-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .proof-grid div {
    min-height: 92px;
    padding: 16px 20px;
    border-bottom: 1px solid var(--line);
  }

  .proof-grid div:nth-child(2n) {
    border-right: 1px solid var(--line);
  }

  .section {
    padding-block: 68px;
  }

  .section-heading {
    display: block;
    margin-bottom: 30px;
  }

  .section-heading h2 {
    font-size: 30px;
  }

  .section-heading p {
    margin-top: 10px;
  }

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

  .feature-list article,
  .feature-list article:first-child {
    min-height: 0;
    padding: 24px 20px;
  }

  .feature-index {
    margin-bottom: 16px;
  }

  .screenshot-gallery {
    display: grid;
    grid-template-columns: minmax(0, 280px);
    gap: 18px;
    justify-content: center;
  }

  .screenshot-gallery figure {
    width: 100%;
    max-width: 280px;
  }

  .contact-list {
    grid-template-columns: 1fr;
  }

  .contact-item,
  .contact-item:first-child {
    min-height: 130px;
    padding: 22px 20px;
    border-right: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    border-left: 1px solid var(--line);
  }

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

  .footer-inner {
    min-height: 0;
    padding-block: 36px;
  }

  .footer-links {
    gap: 14px 18px;
  }

  .legal-main {
    padding-block: 28px 56px;
  }

  .legal-document {
    width: min(calc(100% - 28px), 860px);
    padding: 30px 22px;
  }

  .legal-document h1 {
    font-size: 28px;
  }

  .legal-document h2 {
    font-size: 20px;
  }
}

@media (max-width: 380px) {
  .hero-section,
  .hero-content {
    min-height: 570px;
  }

  .hero-brandline span {
    font-size: 12px;
  }

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

  .download-button {
    font-size: 13px;
  }
}

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

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