:root {
  color-scheme: light;
  font-family: Inter, "SF Pro Display", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --blue: #176cf0;
  --blue-deep: #0e55c5;
  --blue-soft: #edf4ff;
  --green: #0caf67;
  --green-soft: #eaf8f1;
  --ink: #0b1733;
  --body: #3f4e68;
  --muted: #738098;
  --line: #dce4ef;
  --surface: #ffffff;
  --soft: #f6f8fb;
  --shadow: 0 20px 55px rgba(33, 62, 105, 0.14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body { min-width: 320px; margin: 0; color: var(--ink); background: var(--surface); }
body.nav-open { overflow: hidden; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
button { color: inherit; font: inherit; letter-spacing: 0; }
img { display: block; max-width: 100%; }
svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.9; stroke-linecap: round; stroke-linejoin: round; }
.icon-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.section-inner { width: min(1180px, calc(100% - 48px)); margin: 0 auto; }

.site-header {
  position: sticky;
  z-index: 50;
  top: 0;
  height: 72px;
  border-bottom: 1px solid rgba(220, 228, 239, 0.9);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
}
.header-inner { width: min(1380px, calc(100% - 48px)); height: 100%; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.brand { display: inline-flex; align-items: center; gap: 11px; font-size: 21px; font-weight: 800; white-space: nowrap; }
.brand img { width: 42px; height: 42px; border-radius: 8px; }
.site-nav { display: flex; align-items: center; gap: 38px; margin-left: auto; }
.site-nav a { position: relative; padding: 25px 0 23px; color: #263650; font-size: 15px; font-weight: 650; }
.site-nav a::after { position: absolute; right: 0; bottom: 18px; left: 0; height: 2px; background: var(--blue); content: ""; transform: scaleX(0); transition: transform 160ms ease; }
.site-nav a:hover::after, .site-nav a:focus-visible::after { transform: scaleX(1); }
.header-actions { display: flex; align-items: center; gap: 10px; }
.icon-button.nav-toggle { display: none; }

.button {
  min-height: 44px;
  padding: 0 19px;
  border: 1px solid transparent;
  border-radius: 7px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 750;
  transition: border-color 160ms ease, background 160ms ease, color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}
.button:hover { transform: translateY(-1px); }
.button:focus-visible, .icon-button:focus-visible, a:focus-visible { outline: 3px solid rgba(23, 108, 240, 0.22); outline-offset: 3px; }
.button.primary { background: var(--blue); color: #fff; box-shadow: 0 10px 24px rgba(23, 108, 240, 0.2); }
.button.primary:hover { background: var(--blue-deep); box-shadow: 0 12px 28px rgba(23, 108, 240, 0.27); }
.button.secondary { border-color: #a9c8fa; background: #fff; color: var(--blue); }
.button.secondary:hover { border-color: var(--blue); background: #f8fbff; }
.button.large { min-height: 52px; padding: 0 23px; font-size: 16px; }
.icon-button { width: 44px; height: 44px; padding: 0; border: 1px solid var(--line); border-radius: 7px; display: grid; place-items: center; background: #fff; cursor: pointer; }

.hero { min-height: min(700px, calc(100svh - 120px)); display: flex; align-items: center; overflow: hidden; background: #fff; }
.hero-grid { min-height: 0; padding: 56px 0 58px; display: grid; grid-template-columns: minmax(360px, 0.76fr) minmax(600px, 1.24fr); gap: 62px; align-items: center; }
.hero-copy { position: relative; z-index: 2; }
.hero-copy h1 { margin: 0; max-width: 560px; font-size: 72px; line-height: 1.04; letter-spacing: 0; font-weight: 850; }
.hero-copy > p { max-width: 560px; margin: 26px 0 0; color: var(--body); font-size: 23px; line-height: 1.65; }
.hero-actions { margin-top: 38px; display: flex; flex-wrap: wrap; gap: 14px; }
.availability { margin-top: 27px; display: flex; align-items: center; flex-wrap: wrap; gap: 9px; color: var(--muted); font-size: 13px; }
.status-dot { width: 9px; height: 9px; border-radius: 50%; background: #a8b2c3; }
.status-dot.online { background: var(--green); box-shadow: 0 0 0 4px rgba(12, 175, 103, 0.11); }
.status-dot.offline { background: #d94a51; }
.separator { width: 1px; height: 15px; margin: 0 5px; background: var(--line); }

.product-visual { position: relative; min-width: 0; }
.window-frame { overflow: hidden; border: 1px solid #cbd8ea; border-radius: 8px; background: #fff; box-shadow: var(--shadow); transform: perspective(1600px) rotateY(-2deg); transform-origin: center right; }
.window-bar { height: 46px; padding: 0 14px; border-bottom: 1px solid #e1e7f0; display: flex; align-items: center; justify-content: space-between; color: #36445a; background: #fafcff; font-size: 12px; font-weight: 700; }
.window-mark { display: inline-flex; align-items: center; gap: 8px; }
.window-mark img { width: 24px; height: 24px; border-radius: 5px; }
.window-controls { display: flex; align-items: center; gap: 13px; }
.window-controls i { width: 10px; height: 10px; border: 1px solid #91a0b5; display: block; }
.window-controls i:first-child { height: 1px; border-width: 1px 0 0; }
.window-controls i:last-child { position: relative; border: 0; }
.window-controls i:last-child::before, .window-controls i:last-child::after { position: absolute; top: 5px; left: 0; width: 11px; height: 1px; background: #91a0b5; content: ""; transform: rotate(45deg); }
.window-controls i:last-child::after { transform: rotate(-45deg); }
.window-frame > img { width: 100%; aspect-ratio: 1.6 / 1; object-fit: cover; object-position: top left; }
.connection-note { position: absolute; right: 22px; bottom: -24px; min-height: 46px; padding: 0 16px; border: 1px solid #cde9da; border-radius: 7px; display: flex; align-items: center; gap: 9px; background: #fff; color: #23724f; box-shadow: 0 12px 30px rgba(31, 62, 95, 0.14); font-size: 13px; font-weight: 700; }
.connection-note span { width: 9px; height: 9px; border-radius: 50%; background: var(--green); }

.role-section { padding: 92px 0 94px; border-top: 1px solid #e7ecf3; background: var(--soft); }
.section-heading h2, .download-copy h2, .check-copy h2 { margin: 0; font-size: 38px; line-height: 1.24; letter-spacing: 0; }
.section-heading p, .download-copy p, .check-copy p { margin: 13px 0 0; color: var(--muted); font-size: 17px; line-height: 1.7; }
.split-heading { display: flex; align-items: flex-end; justify-content: space-between; gap: 32px; }
.text-link { display: inline-flex; align-items: center; gap: 8px; color: var(--blue); font-size: 14px; font-weight: 750; white-space: nowrap; }
.text-link svg { width: 17px; height: 17px; }
.role-grid { margin-top: 48px; display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.role-item { min-width: 0; padding: 30px; border: 1px solid var(--line); border-radius: 8px; display: grid; grid-template-columns: 56px minmax(0, 1fr); gap: 20px; background: #fff; }
.role-icon { width: 56px; height: 56px; border-radius: 8px; display: grid; place-items: center; color: var(--blue); background: var(--blue-soft); }
.role-icon svg { width: 28px; height: 28px; }
.candidate-role .role-icon { color: #087b4a; background: var(--green-soft); }
.role-item h3 { margin: 3px 0 0; font-size: 23px; }
.role-item p { margin: 9px 0 0; color: var(--body); font-size: 15px; line-height: 1.7; }
.role-item ul { grid-column: 1 / -1; margin: 9px 0 0; padding: 20px 0 0; border-top: 1px solid #e7ecf3; display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; list-style: none; }
.role-item li { display: flex; align-items: flex-start; gap: 7px; color: #56637a; font-size: 13px; line-height: 1.5; }
.role-item li svg { width: 16px; height: 16px; flex: 0 0 auto; margin-top: 2px; color: var(--green); stroke-width: 2.4; }

.workflow-section { padding: 100px 0; background: #fff; }
.centered { max-width: 720px; margin: 0 auto; text-align: center; }
.workflow-list { margin: 58px 0 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); list-style: none; }
.workflow-list li { position: relative; min-width: 0; padding: 0 44px; text-align: center; }
.workflow-list li + li { border-left: 1px solid var(--line); }
.step-number { position: absolute; top: -10px; left: 45px; color: #dbe9ff; font-size: 60px; line-height: 1; font-weight: 850; }
.step-icon { position: relative; width: 74px; height: 74px; margin: 0 auto; border-radius: 50%; display: grid; place-items: center; color: var(--blue); background: var(--blue-soft); }
.step-icon.green { color: var(--green); background: var(--green-soft); }
.step-icon svg { width: 30px; height: 30px; }
.workflow-list h3 { margin: 23px 0 0; font-size: 20px; }
.workflow-list p { max-width: 250px; margin: 10px auto 0; color: var(--muted); font-size: 14px; line-height: 1.7; }

.download-section { padding: 98px 0; border-top: 1px solid #e5ebf3; border-bottom: 1px solid #e5ebf3; background: var(--soft); }
.download-layout { display: grid; grid-template-columns: minmax(250px, 0.65fr) minmax(640px, 1.35fr); gap: 74px; align-items: start; }
.download-copy { padding-top: 22px; }
.download-table { border-top: 1px solid #cfd9e7; }
.download-row { min-height: 136px; padding: 25px 0; border-bottom: 1px solid #cfd9e7; display: grid; grid-template-columns: minmax(180px, 0.72fr) minmax(380px, 1.28fr); gap: 26px; align-items: center; }
.download-role { display: flex; align-items: center; gap: 15px; }
.download-role-icon { width: 48px; height: 48px; border: 1px solid #bed3f6; border-radius: 7px; display: grid; place-items: center; color: var(--blue); background: #fff; }
.download-role-icon.candidate { border-color: #bfe5d2; color: #07804c; }
.download-role-icon svg { width: 24px; height: 24px; }
.download-role strong { display: block; font-size: 18px; }
.download-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.download-button { min-height: 68px; padding: 0 17px; border: 1px solid #bfd0e7; border-radius: 7px; display: flex; align-items: center; justify-content: center; gap: 13px; background: #fff; color: #1c2b44; transition: border-color 160ms ease, color 160ms ease, transform 160ms ease, box-shadow 160ms ease; }
.download-button:hover { border-color: var(--blue); color: var(--blue); transform: translateY(-1px); box-shadow: 0 8px 20px rgba(31, 70, 123, 0.09); }
.download-button.recommended { order: -1; border-color: var(--blue); box-shadow: inset 0 -3px 0 var(--blue); }
.download-button svg { width: 25px; height: 25px; }
.download-button span, .download-button small { display: block; }
.download-button span { font-size: 14px; font-weight: 780; }
.download-button small { margin-top: 3px; color: var(--muted); font-size: 10px; font-weight: 600; }

.check-section { padding: 108px 0; background: #fff; }
.check-layout { display: grid; grid-template-columns: minmax(350px, 0.72fr) minmax(560px, 1.28fr); gap: 78px; align-items: center; }
.section-icon { width: 52px; height: 52px; margin-bottom: 24px; border-radius: 8px; display: grid; place-items: center; color: var(--blue); background: var(--blue-soft); }
.section-icon svg { width: 25px; height: 25px; }
.check-copy .button { margin-top: 30px; }
.check-preview { overflow: hidden; border: 1px solid #cbd8e8; border-radius: 8px; background: #fff; box-shadow: var(--shadow); }
.preview-header { height: 45px; padding: 0 14px; border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 16px; background: #fafcff; font-size: 12px; }
.preview-header > span { display: flex; gap: 6px; }
.preview-header i { width: 8px; height: 8px; border-radius: 50%; background: #a8b3c5; }
.preview-header i:first-child { background: #ef6a6a; }
.preview-header i:nth-child(2) { background: #efb93f; }
.preview-header i:nth-child(3) { background: var(--green); }
.preview-body { min-height: 310px; padding: 20px; display: grid; grid-template-columns: 1.38fr 0.62fr; gap: 15px; background: var(--soft); }
.preview-screen { min-width: 0; border: 1px solid #d4deeb; display: grid; place-items: center; align-content: center; gap: 11px; color: #8592a6; background: #152033; }
.preview-screen svg { width: 42px; height: 42px; color: #7faeff; }
.preview-screen span { font-size: 12px; }
.preview-stats { border: 1px solid #d4deeb; background: #fff; }
.preview-stats > div { min-height: 81px; padding: 13px; border-bottom: 1px solid #e5eaf1; display: flex; align-items: center; gap: 10px; }
.preview-stats > div:last-child { border-bottom: 0; }
.preview-ok { width: 24px; height: 24px; flex: 0 0 auto; border-radius: 50%; display: grid; place-items: center; color: #fff; background: var(--green); }
.preview-ok svg { width: 14px; height: 14px; stroke-width: 2.5; }
.preview-stats p { margin: 0; color: var(--muted); font-size: 10px; line-height: 1.45; }
.preview-stats strong { display: block; margin-top: 3px; color: var(--ink); font-size: 12px; }

.site-footer { border-top: 1px solid var(--line); background: var(--soft); }
.footer-inner { min-height: 126px; display: grid; grid-template-columns: 1fr auto auto; gap: 44px; align-items: center; }
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-brand img { width: 42px; height: 42px; border-radius: 8px; }
.footer-brand strong, .footer-brand span { display: block; }
.footer-brand strong { font-size: 17px; }
.footer-brand span { margin-top: 3px; color: var(--muted); font-size: 11px; }
.site-footer nav { display: flex; gap: 25px; color: #4a5870; font-size: 13px; }
.site-footer nav a:hover { color: var(--blue); }
.site-footer p { margin: 0; color: #8a95a8; font-size: 12px; }
.footer-meta { display: grid; gap: 6px; justify-items: end; color: #8a95a8; font-size: 12px; white-space: nowrap; }
.footer-meta a:hover { color: var(--blue); }

@media (max-width: 1080px) {
  .site-nav { gap: 25px; }
  .hero { min-height: min(660px, calc(100svh - 120px)); }
  .hero-grid { grid-template-columns: 0.8fr 1.2fr; gap: 34px; }
  .hero-copy h1 { font-size: 58px; }
  .hero-copy > p { font-size: 19px; }
  .role-item ul { grid-template-columns: 1fr; }
  .download-layout { grid-template-columns: 1fr; gap: 34px; }
  .download-copy { max-width: 620px; padding-top: 0; }
  .check-layout { gap: 42px; }
}

@media (max-width: 820px) {
  .section-inner, .header-inner { width: min(100% - 32px, 680px); }
  .site-nav { position: absolute; z-index: 60; top: 100%; right: 0; left: 0; height: calc(100svh - 72px); padding: 18px 24px; display: none; overflow: auto; align-items: stretch; flex-direction: column; gap: 0; background: #fff; box-shadow: 0 20px 30px rgba(28, 48, 78, 0.08); }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 18px 8px; border-bottom: 1px solid var(--line); font-size: 17px; }
  .site-nav a::after { display: none; }
  .icon-button.nav-toggle { display: grid; }
  .header-download { display: none; }
  .hero { min-height: auto; }
  .hero-grid { min-height: auto; padding: 70px 0 76px; grid-template-columns: 1fr; gap: 54px; }
  .hero-copy { max-width: 620px; }
  .hero-copy h1 { font-size: 54px; }
  .product-visual { width: 100%; }
  .window-frame { transform: none; }
  .role-grid, .check-layout { grid-template-columns: 1fr; }
  .workflow-list li { padding: 0 22px; }
  .step-number { left: 20px; }
  .footer-inner { padding: 28px 0; grid-template-columns: 1fr auto; }
  .footer-meta { grid-column: 1 / -1; justify-items: start; }
}

@media (max-width: 620px) {
  .site-header { height: 64px; }
  .site-nav { height: calc(100svh - 64px); }
  .brand { font-size: 18px; }
  .brand img { width: 38px; height: 38px; }
  .hero-grid { padding: 30px 0 40px; gap: 28px; }
  .hero-copy h1 { font-size: 44px; }
  .hero-copy > p { margin-top: 20px; font-size: 18px; line-height: 1.6; }
  .hero-actions { margin-top: 29px; align-items: stretch; flex-direction: column; }
  .hero-actions .button { width: 100%; }
  .availability { align-items: flex-start; }
  .separator { display: none; }
  .availability span:last-child { width: 100%; padding-left: 18px; }
  .window-bar { height: 40px; }
  .window-frame > img { aspect-ratio: 1.5 / 1; }
  .connection-note { right: 12px; bottom: -23px; }
  .role-section, .workflow-section, .download-section, .check-section { padding: 72px 0; }
  .section-heading h2, .download-copy h2, .check-copy h2 { font-size: 31px; }
  .section-heading p, .download-copy p, .check-copy p { font-size: 15px; }
  .split-heading { align-items: flex-start; flex-direction: column; }
  .role-grid { margin-top: 34px; }
  .role-item { padding: 22px; grid-template-columns: 48px minmax(0, 1fr); gap: 15px; }
  .role-icon { width: 48px; height: 48px; }
  .role-item h3 { font-size: 20px; }
  .workflow-list { margin-top: 42px; grid-template-columns: 1fr; gap: 36px; }
  .workflow-list li { padding: 0 0 34px; }
  .workflow-list li + li { padding-top: 36px; border-top: 1px solid var(--line); border-left: 0; }
  .step-number { top: 2px; left: calc(50% - 74px); font-size: 48px; }
  .workflow-list li + li .step-number { top: 38px; }
  .download-row { grid-template-columns: 1fr; gap: 18px; }
  .download-actions { grid-template-columns: 1fr 1fr; }
  .download-button { min-height: 64px; padding: 0 10px; }
  .preview-body { min-height: 390px; grid-template-columns: 1fr; }
  .preview-screen { min-height: 190px; }
  .preview-stats { display: grid; grid-template-columns: repeat(3, 1fr); }
  .preview-stats > div { min-width: 0; padding: 10px 7px; border-right: 1px solid #e5eaf1; border-bottom: 0; align-items: center; flex-direction: column; text-align: center; }
  .preview-stats > div:last-child { border-right: 0; }
  .footer-inner { grid-template-columns: 1fr; gap: 24px; }
  .site-footer nav { flex-wrap: wrap; gap: 16px 22px; }
  .footer-meta { grid-column: auto; }
}

@media (max-width: 390px) {
  .section-inner, .header-inner { width: calc(100% - 24px); }
  .hero-copy h1 { font-size: 40px; }
  .download-actions { grid-template-columns: 1fr; }
  .preview-stats { grid-template-columns: 1fr; }
  .preview-stats > div { border-right: 0; border-bottom: 1px solid #e5eaf1; flex-direction: row; text-align: left; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}