:root {
  color-scheme: light;
  --ink: #111216;
  --ink-soft: #545861;
  --line: #dfe1e6;
  --paper: #ffffff;
  --paper-soft: #f5f6f8;
  --dark: #0c0d10;
  --dark-soft: #17191f;
  --blue: #5b7cfa;
  --blue-dark: #3f5fd6;
  --coral: #ff6b5f;
  --mint: #43cfa3;
  --max: 1200px;
  --header: 64px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei UI", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: 0;
}

img {
  max-width: 100%;
}

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

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

button,
input {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--header);
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.header-inner {
  width: min(var(--max), calc(100% - 40px));
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

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

.brand span,
.footer-brand span {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.brand strong,
.footer-brand strong {
  font-size: 16px;
  font-weight: 760;
}

.brand small,
.footer-brand small {
  margin-top: 4px;
  color: var(--ink-soft);
  font-size: 11px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 26px;
  margin-left: auto;
}

.main-nav a {
  color: #353840;
  font-size: 14px;
}

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

.header-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 16px;
  color: #fff;
  background: var(--ink);
  border: 1px solid var(--ink);
  border-radius: 6px;
  font-size: 14px;
  font-weight: 700;
}

.header-action:hover {
  background: #2b2e35;
}

.hero {
  position: relative;
  height: calc(100svh - 108px);
  min-height: 540px;
  max-height: 760px;
  overflow: hidden;
  color: #fff;
  background: var(--dark);
}

.hero-product {
  position: absolute;
  z-index: 1;
  top: 0;
  right: 0;
  width: 64%;
  height: 100%;
  object-fit: cover;
  object-position: 46% center;
  opacity: 0.92;
}

.hero-shade {
  position: absolute;
  z-index: 2;
  inset: 0;
  background: rgba(12, 13, 16, 0.28);
}

.hero-shade::before {
  content: "";
  position: absolute;
  inset: 0 42% 0 0;
  background: rgba(12, 13, 16, 0.94);
}

.hero-inner {
  position: relative;
  z-index: 3;
  width: min(var(--max), calc(100% - 40px));
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
}

.hero-copy {
  width: 56%;
  max-width: 680px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.hero .eyebrow,
.heading-on-dark .eyebrow,
.section-dark .eyebrow {
  color: #98abff;
}

.hero h1 {
  margin: 0;
  font-size: 68px;
  line-height: 1;
  font-weight: 800;
}

.hero-lead {
  max-width: 600px;
  margin: 24px 0 0;
  color: #e2e4e9;
  font-size: 22px;
  line-height: 1.55;
}

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

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 750;
  line-height: 1.2;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  color: #fff;
  background: var(--blue);
  border-color: var(--blue);
}

.button-primary:hover {
  background: var(--blue-dark);
  border-color: var(--blue-dark);
}

.button-secondary {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.36);
}

.button-secondary:hover {
  background: rgba(255, 255, 255, 0.16);
}

.button-outline {
  color: var(--ink);
  background: var(--paper);
  border-color: #bfc3cc;
}

.button-outline:hover {
  border-color: var(--ink);
}

.button:disabled {
  color: #9297a1;
  background: #eceef2;
  border-color: #d8dbe1;
  cursor: not-allowed;
  transform: none;
}

.button-wide {
  width: 100%;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  margin-top: 28px;
  color: #aeb2bc;
  font-size: 13px;
}

.hero-meta span {
  padding: 0 14px;
  border-left: 1px solid #434650;
}

.hero-meta span:first-child {
  padding-left: 0;
  border-left: 0;
}

.hero-meta b {
  color: #fff;
}

.trust-strip {
  min-height: 54px;
  color: #d7dae0;
  background: #181a20;
  border-top: 1px solid #2a2d35;
}

.trust-inner {
  width: min(var(--max), calc(100% - 40px));
  min-height: 54px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  align-items: center;
}

.trust-inner span {
  padding: 0 20px;
  border-left: 1px solid #333640;
  text-align: center;
  font-size: 13px;
}

.trust-inner span:first-child {
  border-left: 0;
}

.section {
  padding: 92px 0;
}

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

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

.section-dark {
  color: #fff;
  background: var(--dark);
}

.section-accent {
  color: #fff;
  background: #21232a;
  border-top: 4px solid var(--coral);
}

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

.section-heading {
  max-width: 720px;
  margin-bottom: 48px;
}

.section-heading h2,
.privacy-layout h2,
.download-copy h2,
.purchase-process h2,
.contact-panel h2,
.safety-layout h2,
.buy-download h2 {
  margin: 0;
  font-size: 42px;
  line-height: 1.18;
}

.section-heading > p:last-child,
.download-copy > p,
.buy-download > div > p,
.subhero p,
.contact-note {
  color: var(--ink-soft);
}

.heading-on-dark > p:last-child,
.section-dark .contact-note {
  color: #aeb3bd;
}

.compact-heading {
  margin: 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 44px 34px;
}

.feature-item {
  padding-top: 20px;
  border-top: 2px solid var(--line);
}

.feature-number {
  color: var(--blue);
  font-family: Consolas, monospace;
  font-size: 13px;
  font-weight: 800;
}

.feature-item:nth-child(2) .feature-number,
.feature-item:nth-child(5) .feature-number {
  color: var(--coral);
}

.feature-item:nth-child(3) .feature-number,
.feature-item:nth-child(6) .feature-number {
  color: #159e78;
}

.feature-item h3 {
  margin: 12px 0 8px;
  font-size: 21px;
}

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

.demo-layout {
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 36px;
  align-items: start;
}

.demo-controls {
  display: grid;
  gap: 8px;
}

.demo-tab {
  min-height: 48px;
  padding: 0 16px;
  color: #c6cad3;
  background: transparent;
  border: 1px solid #3a3e48;
  border-radius: 6px;
  cursor: pointer;
  text-align: left;
  font-weight: 700;
}

.demo-tab:hover,
.demo-tab.is-active {
  color: #fff;
  background: #23262e;
  border-color: #8298f5;
}

.demo-figure {
  margin: 0;
}

.demo-window {
  overflow: hidden;
  background: #f3f4f6;
  border: 1px solid #343740;
  border-radius: 8px;
  box-shadow: 0 28px 70px rgba(0, 0, 0, 0.34);
}

.window-bar {
  height: 38px;
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 0 14px;
  color: #a8adb8;
  background: #1b1d23;
  border-bottom: 1px solid #30333b;
}

.window-bar i {
  width: 9px;
  height: 9px;
  background: #525762;
  border-radius: 50%;
}

.window-bar i:first-child {
  background: var(--coral);
}

.window-bar i:nth-child(2) {
  background: #e2b447;
}

.window-bar i:nth-child(3) {
  background: var(--mint);
}

.window-bar span {
  margin-left: 8px;
  font-size: 12px;
}

.demo-window img {
  display: block;
  width: 100%;
  height: 610px;
  object-fit: contain;
  background: #101114;
}

.demo-figure figcaption {
  margin-top: 14px;
  color: #aeb3bd;
  font-size: 14px;
}

.workflow-layout {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 80px;
}

.workflow-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.workflow-list li {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 24px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.workflow-list b {
  font-size: 18px;
}

.workflow-list span {
  color: var(--ink-soft);
}

.privacy-layout {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 80px;
  align-items: center;
}

.privacy-layout p:last-child {
  margin: 0;
  color: #d8dbe2;
  font-size: 18px;
}

.download-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 80px;
  align-items: center;
}

.download-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 24px;
  color: var(--ink-soft);
  font-size: 14px;
}

.download-facts b {
  color: var(--ink);
}

.download-actions {
  display: grid;
  gap: 10px;
}

.download-actions small {
  color: #767b85;
  line-height: 1.5;
}

.faq-layout {
  display: grid;
  grid-template-columns: 0.65fr 1.35fr;
  gap: 80px;
}

.faq-list {
  border-top: 1px solid #cfd2d9;
}

.faq-list details {
  border-bottom: 1px solid #cfd2d9;
}

.faq-list summary {
  padding: 22px 36px 22px 0;
  cursor: pointer;
  font-size: 18px;
  font-weight: 750;
}

.faq-list p {
  margin: -6px 0 22px;
  color: var(--ink-soft);
}

.subhero {
  padding: 76px 0 68px;
  color: #fff;
  background: var(--dark);
  border-bottom: 4px solid var(--blue);
}

.subhero-inner {
  max-width: var(--max);
}

.subhero h1 {
  margin: 0;
  font-size: 52px;
  line-height: 1.15;
}

.subhero p:last-child {
  max-width: 720px;
  margin: 18px 0 0;
  color: #c3c7d0;
  font-size: 19px;
}

.buy-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 44px;
  align-items: stretch;
}

.contact-panel {
  padding: 36px;
  background: var(--paper-soft);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.group-display {
  margin: 26px 0 18px;
  padding: 24px 0;
  border-top: 1px solid #cfd2d9;
  border-bottom: 1px solid #cfd2d9;
}

.group-display span {
  display: block;
  color: var(--ink-soft);
  font-size: 14px;
}

.group-display strong {
  display: block;
  margin-top: 6px;
  overflow-wrap: anywhere;
  font-family: Consolas, "Microsoft YaHei UI", sans-serif;
  font-size: 30px;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.copy-status {
  min-height: 24px;
  margin: 12px 0 0;
  color: #147b5e;
  font-size: 14px;
}

.purchase-process {
  padding: 36px 0 36px 22px;
}

.purchase-process ol {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.purchase-process li {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 16px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.purchase-process li > span {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--ink);
  border-radius: 50%;
  font-family: Consolas, monospace;
  font-size: 13px;
}

.purchase-process b {
  font-size: 18px;
}

.purchase-process p {
  margin: 4px 0 0;
  color: var(--ink-soft);
}

.safety-layout {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 80px;
}

.safety-layout ul {
  margin: 0;
  padding-left: 20px;
  color: #d1d4db;
}

.safety-layout li + li {
  margin-top: 12px;
}

.buy-download {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 70px;
  align-items: center;
}

.legal-main {
  min-height: calc(100vh - var(--header));
  padding: 70px 20px 96px;
  background: var(--paper-soft);
}

.legal-document {
  width: min(820px, 100%);
  margin: 0 auto;
  padding: 46px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.legal-document h1 {
  margin: 0 0 24px;
  font-size: 46px;
}

.legal-document h2 {
  margin: 36px 0 10px;
  font-size: 22px;
}

.legal-document p {
  color: #4c5058;
}

.site-footer {
  color: #b8bcc5;
  background: #121419;
  border-top: 1px solid #292c34;
}

.footer-inner {
  width: min(var(--max), calc(100% - 40px));
  min-height: 112px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 32px;
  align-items: center;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.footer-brand strong {
  color: #fff;
}

.footer-brand small {
  color: #9398a3;
}

.footer-inner nav {
  display: flex;
  gap: 22px;
  font-size: 13px;
}

.footer-inner a:hover {
  color: #fff;
}

.footer-inner > p {
  margin: 0;
  font-size: 12px;
}

@media (max-width: 980px) {
  .main-nav {
    gap: 18px;
  }

  .hero-copy {
    width: 65%;
  }

  .hero-product {
    width: 72%;
    opacity: 0.72;
  }

  .hero-shade::before {
    inset: 0 34% 0 0;
  }

  .hero h1 {
    font-size: 56px;
  }

  .hero-lead {
    font-size: 19px;
  }

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

  .workflow-layout,
  .privacy-layout,
  .download-layout,
  .faq-layout,
  .buy-layout,
  .safety-layout,
  .buy-download {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  .demo-layout {
    grid-template-columns: 1fr;
  }

  .demo-controls {
    display: flex;
  }

  .demo-tab {
    flex: 1 1 0;
    text-align: center;
  }

  .download-actions,
  .buy-download > .button {
    width: min(420px, 100%);
  }

  .purchase-process {
    padding: 10px 0 0;
  }
}

@media (max-width: 720px) {
  :root {
    --header: 60px;
  }

  body {
    font-size: 15px;
  }

  .header-inner,
  .hero-inner,
  .section-inner,
  .trust-inner,
  .footer-inner {
    width: min(100% - 28px, var(--max));
  }

  .brand small,
  .main-nav {
    display: none;
  }

  .header-inner {
    gap: 12px;
  }

  .header-action {
    margin-left: auto;
    min-height: 36px;
    padding: 0 12px;
  }

  .hero {
    height: calc(100svh - 96px);
    min-height: 510px;
    max-height: 650px;
  }

  .hero-product {
    width: 100%;
    opacity: 0.52;
    object-position: 43% center;
  }

  .hero-shade {
    background: rgba(12, 13, 16, 0.54);
  }

  .hero-shade::before {
    inset: 0;
    background: rgba(12, 13, 16, 0.48);
  }

  .hero-copy {
    width: 100%;
  }

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

  .hero-lead {
    max-width: 540px;
    font-size: 18px;
  }

  .hero-actions {
    display: grid;
    width: min(340px, 100%);
  }

  .hero-meta {
    gap: 8px 0;
  }

  .hero-meta span {
    padding: 0 10px;
  }

  .trust-inner {
    grid-template-columns: repeat(2, 1fr);
    padding: 8px 0;
  }

  .trust-inner span {
    min-height: 38px;
    display: grid;
    place-items: center;
    padding: 0 8px;
    border-left: 0;
    font-size: 12px;
  }

  .section {
    padding: 66px 0;
  }

  .section-heading {
    margin-bottom: 36px;
  }

  .section-heading h2,
  .privacy-layout h2,
  .download-copy h2,
  .purchase-process h2,
  .contact-panel h2,
  .safety-layout h2,
  .buy-download h2 {
    font-size: 32px;
  }

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

  .demo-controls {
    display: grid;
  }

  .demo-window img {
    height: 460px;
  }

  .workflow-list li {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .subhero {
    padding: 58px 0 52px;
  }

  .subhero h1 {
    font-size: 40px;
  }

  .contact-panel,
  .legal-document {
    padding: 28px 22px;
  }

  .group-display strong {
    font-size: 24px;
  }

  .contact-actions {
    display: grid;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 18px;
    padding: 28px 0;
  }

  .footer-inner nav {
    flex-wrap: wrap;
  }
}

@media (max-height: 640px) {
  .hero {
    height: 480px;
    min-height: 0;
  }

  .hero-lead {
    margin-top: 16px;
  }

  .hero-actions {
    margin-top: 20px;
  }

  .hero-meta {
    margin-top: 18px;
  }
}

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

  .button {
    transition: none;
  }
}