:root {
  color-scheme: light;
  font-family: Inter, "Segoe UI", "Microsoft YaHei UI", "PingFang SC", system-ui, sans-serif;
  --ink: #15181d;
  --muted: #626973;
  --soft: #f5f6f7;
  --soft-blue: #edf4ff;
  --line: #dde1e6;
  --line-strong: #cbd1d9;
  --blue: #2667d8;
  --blue-dark: #174b9a;
  --green: #15745b;
  --green-soft: #e9f7f1;
  --charcoal: #161a20;
  --white: #ffffff;
  --header-height: 68px;
}

* {
  box-sizing: border-box;
  letter-spacing: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 18px);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-size: 15px;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

body.menu-open {
  overflow: hidden;
}

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

button,
input,
textarea,
select {
  font: inherit;
}

button {
  border: 0;
}

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

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

h1,
h2,
h3,
p,
figure,
dl,
dd {
  margin: 0;
}

h1,
h2,
h3,
strong {
  font-weight: 750;
}

.shell {
  width: min(1180px, calc(100% - 48px));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 9px 12px;
  color: var(--white);
  background: var(--charcoal);
  transform: translateY(-160%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  border-bottom: 1px solid rgba(221, 225, 230, 0.9);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
}

.site-header.scrolled {
  box-shadow: 0 7px 24px rgba(21, 24, 29, 0.08);
}

.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand,
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.brand img {
  width: 38px;
  height: 38px;
  border-radius: 8px;
}

.brand span,
.footer-brand span {
  display: grid;
  line-height: 1.1;
}

.brand strong {
  font-size: 17px;
}

.brand small {
  margin-top: 4px;
  color: var(--muted);
  font-size: 10px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav a {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  padding: 0 13px;
  border-radius: 6px;
  color: #424852;
  font-size: 13px;
  font-weight: 650;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--blue-dark);
  background: var(--soft-blue);
  outline: none;
}

.site-nav .nav-download {
  margin-left: 8px;
  color: var(--white);
  background: var(--charcoal);
}

.site-nav .nav-download:hover,
.site-nav .nav-download:focus-visible {
  color: var(--white);
  background: #2c323b;
}

.menu-button {
  width: 40px;
  height: 40px;
  display: none;
  place-items: center;
  padding: 9px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  cursor: pointer;
}

.menu-button span {
  width: 18px;
  height: 2px;
  display: block;
  margin: 2px 0;
  background: var(--ink);
  transition: transform 160ms ease, opacity 160ms ease;
}

.menu-button[aria-expanded="true"] span:first-child {
  transform: translateY(4px) rotate(45deg);
}

.menu-button[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-button[aria-expanded="true"] span:last-child {
  transform: translateY(-4px) rotate(-45deg);
}

.hero {
  position: relative;
  height: calc(100svh - 112px);
  min-height: 560px;
  max-height: 720px;
  overflow: hidden;
  color: var(--white);
  background: var(--charcoal);
}

.hero-media,
.hero-overlay {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-media {
  object-fit: cover;
  object-position: center top;
  filter: brightness(0.42) saturate(0.72);
  transform: scale(1.015);
}

.hero-overlay {
  background: rgba(12, 15, 19, 0.28);
}

.hero-content {
  position: relative;
  z-index: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding-block: 44px;
}

.hero-kicker,
.section-label {
  color: var(--blue-dark);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.hero-kicker {
  color: #dbe8ff;
}

.hero h1 {
  max-width: 720px;
  margin-top: 10px;
  font-size: 58px;
  line-height: 1.08;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.35);
}

.hero-lead {
  max-width: 670px;
  margin-top: 18px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 18px;
  line-height: 1.8;
  text-shadow: 0 2px 14px rgba(0, 0, 0, 0.32);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 19px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 750;
  transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.button-primary {
  color: var(--white);
  background: var(--blue);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.2);
}

.button-primary:hover,
.button-primary:focus-visible {
  background: #1f59be;
  transform: translateY(-1px);
  outline: none;
}

.button-disabled {
  border: 1px solid rgba(255, 255, 255, 0.28);
  color: rgba(255, 255, 255, 0.72);
  background: rgba(255, 255, 255, 0.1);
  cursor: not-allowed;
}

.hero-points {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin: 24px 0 0;
  padding: 0;
  color: rgba(255, 255, 255, 0.72);
  font-size: 12px;
  list-style: none;
}

.hero-points li {
  position: relative;
  padding-left: 15px;
}

.hero-points li::before {
  content: "";
  position: absolute;
  top: 0.68em;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #54cf9f;
}

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

.intro-grid {
  min-height: 112px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

.intro-grid > div {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 22px 34px;
  border-right: 1px solid var(--line);
}

.intro-grid > div:first-child {
  padding-left: 0;
}

.intro-grid > div:last-child {
  border-right: 0;
}

.intro-grid strong {
  font-size: 18px;
}

.intro-grid span {
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
}

.section {
  padding: 92px 0;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 40px;
}

.section-heading h2,
.section-copy h2,
.security-layout h2,
.download-layout h2 {
  margin-top: 9px;
  font-size: 38px;
  line-height: 1.2;
}

.section-heading > p:last-child,
.section-copy > p:not(.section-label),
.download-layout > div > p:last-child {
  margin-top: 14px;
  color: var(--muted);
  line-height: 1.8;
}

.product-layout,
.preview-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  align-items: center;
  gap: 64px;
}

.product-facts {
  margin-top: 30px;
  border-top: 1px solid var(--line);
}

.product-facts > div {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 18px;
  padding: 17px 0;
  border-bottom: 1px solid var(--line);
}

.product-facts dt {
  font-weight: 750;
}

.product-facts dd {
  color: var(--muted);
  font-size: 13px;
}

.product-figure,
.tutorial-figure {
  min-width: 0;
}

.product-figure img,
.tutorial-figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  box-shadow: 0 24px 54px rgba(35, 42, 52, 0.14);
}

.product-figure figcaption {
  margin-top: 12px;
  color: var(--muted);
  font-size: 12px;
}

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

.capability-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.capability-grid article {
  min-height: 190px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
}

.capability-grid article > span {
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
}

.capability-grid h3 {
  margin-top: 28px;
  font-size: 18px;
}

.capability-grid p {
  margin-top: 9px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.75;
}

.tutorial-preview {
  padding-bottom: 76px;
}

.preview-layout {
  grid-template-columns: minmax(0, 1.25fr) minmax(300px, 0.75fr);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 24px;
  color: var(--blue-dark);
  font-weight: 750;
}

.text-link:hover,
.text-link:focus-visible {
  color: var(--blue);
  outline: none;
}

.tutorial-section {
  border-top: 1px solid var(--line);
  background: #fbfbfc;
}

.tutorial-heading {
  max-width: none;
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 40px;
}

.tutorial-heading > p {
  max-width: 470px;
  color: var(--muted);
}

.tutorial-workspace {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
  background: var(--white);
}

.tutorial-nav {
  display: flex;
  flex-direction: column;
  padding: 12px 0;
  border-right: 1px solid var(--line);
  background: var(--soft);
}

.tutorial-nav button {
  position: relative;
  min-height: 64px;
  display: grid;
  grid-template-columns: 34px 1fr;
  grid-template-rows: 1fr 1fr;
  align-items: center;
  gap: 0 10px;
  padding: 9px 18px;
  color: var(--ink);
  text-align: left;
  background: transparent;
  cursor: pointer;
}

.tutorial-nav button::after {
  content: "";
  position: absolute;
  top: 8px;
  right: 0;
  bottom: 8px;
  width: 3px;
  background: transparent;
}

.tutorial-nav button:hover,
.tutorial-nav button:focus-visible {
  background: #e9edf1;
  outline: none;
}

.tutorial-nav button.active {
  color: var(--blue-dark);
  background: var(--white);
}

.tutorial-nav button.active::after {
  background: var(--blue);
}

.tutorial-nav button > span {
  grid-row: 1 / 3;
  color: #88909b;
  font-size: 12px;
  font-weight: 800;
}

.tutorial-nav button.active > span {
  color: var(--blue);
}

.tutorial-nav strong {
  align-self: end;
  overflow: hidden;
  font-size: 14px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tutorial-nav small {
  align-self: start;
  color: var(--muted);
  font-size: 11px;
}

.tutorial-panels {
  min-width: 0;
  min-height: 590px;
}

.tutorial-panel {
  min-height: 590px;
  padding: 46px 52px;
}

.tutorial-panel[hidden] {
  display: none;
}

.panel-route {
  color: var(--blue-dark);
  font-size: 12px;
  font-weight: 800;
}

.tutorial-panel h3 {
  margin-top: 8px;
  font-size: 28px;
}

.panel-summary {
  margin-top: 10px;
  color: var(--muted);
}

.editable-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 24px;
}

.editable-list span {
  padding: 6px 9px;
  border: 1px solid #d7dde6;
  border-radius: 5px;
  color: #46505d;
  background: #f7f8fa;
  font-size: 11px;
}

.tutorial-panel ol {
  display: grid;
  gap: 13px;
  margin: 30px 0 0;
  padding-left: 24px;
}

.tutorial-panel li {
  padding-left: 6px;
  color: #3e4651;
  line-height: 1.7;
}

.tutorial-panel li::marker {
  color: var(--blue);
  font-weight: 800;
}

.success-line,
.note-line {
  margin-top: 28px;
  padding: 14px 16px;
  border-left: 3px solid var(--green);
  color: #285746;
  background: var(--green-soft);
  font-size: 13px;
}

.success-line strong {
  margin-right: 8px;
}

.note-line {
  margin-top: 10px;
  border-left-color: #c38b29;
  color: #74531e;
  background: #fff7e8;
}

.security-band {
  padding: 82px 0;
  color: var(--white);
  background: var(--charcoal);
}

.security-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 76px;
}

.security-layout h2 {
  max-width: 520px;
}

.light-label {
  color: #9bc2ff;
}

.security-points {
  border-top: 1px solid #3b414a;
}

.security-points p {
  display: grid;
  grid-template-columns: 118px 1fr;
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid #3b414a;
}

.security-points span {
  color: #b7bec8;
}

.download-section {
  background: var(--soft-blue);
}

.download-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 54px;
}

.download-layout > div:first-child {
  max-width: 700px;
}

.download-action {
  min-width: 270px;
  display: grid;
  justify-items: stretch;
  gap: 8px;
}

.button-download {
  min-height: 52px;
  color: #767e89;
  background: #dfe3e8;
  cursor: not-allowed;
}

.download-action small {
  color: var(--muted);
  text-align: center;
}

.site-footer {
  padding: 36px 0;
  border-top: 1px solid var(--line);
  background: var(--white);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 34px;
}

.footer-brand img {
  width: 32px;
  height: 32px;
  border-radius: 7px;
}

.footer-brand small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 10px;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

.site-footer nav a,
.site-footer > .shell > p {
  color: var(--muted);
  font-size: 12px;
}

.site-footer nav a:hover,
.site-footer nav a:focus-visible {
  color: var(--blue-dark);
  outline: none;
}

@media (max-width: 980px) {
  .section {
    padding: 76px 0;
  }

  .product-layout,
  .preview-layout,
  .security-layout {
    grid-template-columns: 1fr;
    gap: 42px;
  }

  .preview-layout .tutorial-figure {
    order: 2;
  }

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

  .tutorial-workspace {
    grid-template-columns: 230px minmax(0, 1fr);
  }

  .tutorial-panel {
    padding: 38px 34px;
  }

  .footer-inner {
    grid-template-columns: 1fr auto;
  }

  .footer-inner > p {
    grid-column: 1 / -1;
  }
}

@media (max-width: 760px) {
  :root {
    --header-height: 64px;
  }

  .shell {
    width: min(100% - 30px, 1180px);
  }

  .menu-button {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    left: 0;
    max-height: calc(100svh - var(--header-height));
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 12px 15px 18px;
    border-bottom: 1px solid var(--line);
    background: var(--white);
    overflow-y: auto;
  }

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

  .site-nav a {
    min-height: 46px;
    justify-content: space-between;
  }

  .site-nav .nav-download {
    margin: 6px 0 0;
    justify-content: center;
  }

  .hero {
    height: calc(100svh - 94px);
    min-height: 540px;
  }

  .hero-media {
    object-position: 34% top;
  }

  .hero-content {
    justify-content: flex-end;
    padding-bottom: 46px;
  }

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

  .hero-lead {
    max-width: 560px;
    font-size: 16px;
  }

  .hero-actions {
    width: 100%;
  }

  .hero-actions .button {
    flex: 1 1 220px;
  }

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

  .intro-grid > div,
  .intro-grid > div:first-child {
    padding: 18px 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .intro-grid > div:last-child {
    border-bottom: 0;
  }

  .section-heading h2,
  .section-copy h2,
  .security-layout h2,
  .download-layout h2 {
    font-size: 31px;
  }

  .product-facts > div {
    grid-template-columns: 1fr;
    gap: 4px;
  }

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

  .capability-grid article {
    min-height: 0;
  }

  .tutorial-heading {
    display: block;
  }

  .tutorial-heading > p {
    margin-top: 14px;
  }

  .tutorial-workspace {
    display: block;
  }

  .tutorial-nav {
    position: relative;
    display: grid;
    grid-template-columns: repeat(8, 184px);
    padding: 8px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    overflow-x: auto;
    overscroll-behavior-inline: contain;
    scrollbar-width: thin;
  }

  .tutorial-nav button {
    min-height: 62px;
    padding: 8px 12px;
  }

  .tutorial-nav button::after {
    top: auto;
    right: 8px;
    bottom: 0;
    left: 8px;
    width: auto;
    height: 3px;
  }

  .tutorial-panels,
  .tutorial-panel {
    min-height: 0;
  }

  .tutorial-panel {
    padding: 32px 20px 38px;
  }

  .tutorial-panel h3 {
    font-size: 24px;
  }

  .security-points p {
    grid-template-columns: 1fr;
    gap: 5px;
  }

  .download-layout {
    align-items: stretch;
    flex-direction: column;
  }

  .download-action {
    min-width: 0;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    align-items: start;
    gap: 22px;
  }

  .footer-inner > p {
    grid-column: auto;
  }
}

@media (max-width: 430px) {
  .shell {
    width: min(100% - 24px, 1180px);
  }

  .hero {
    min-height: 560px;
  }

  .hero h1 {
    font-size: 38px;
  }

  .hero-lead {
    font-size: 15px;
    line-height: 1.7;
  }

  .hero-points {
    gap: 8px 14px;
  }

  .section {
    padding: 64px 0;
  }

  .section-heading h2,
  .section-copy h2,
  .security-layout h2,
  .download-layout h2 {
    font-size: 28px;
  }

  .capability-grid article {
    padding: 20px;
  }

  .product-figure img,
  .tutorial-figure img {
    aspect-ratio: 4 / 3;
    object-position: left top;
  }

  .tutorial-panel {
    padding-inline: 16px;
  }

  .editable-list span {
    max-width: 100%;
    overflow-wrap: anywhere;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}