:root {
  --ink: #121719;
  --steel: #334047;
  --muted: #68757a;
  --line: #c6ced0;
  --paper: #eef1ef;
  --panel: #f8faf8;
  --signal: #e54b22;
  --signal-dark: #b93212;
  --white: #ffffff;
  --deep: #182126;
  --display: "Arial Narrow", "Microsoft YaHei UI", sans-serif;
  --body: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  --mono: Consolas, "SFMono-Regular", monospace;
  --max: 1440px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: var(--body); line-height: 1.65; }
body::before { content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none; opacity: .32; background-image: linear-gradient(rgba(18,23,25,.04) 1px, transparent 1px), linear-gradient(90deg, rgba(18,23,25,.04) 1px, transparent 1px); background-size: 28px 28px; }
img { max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
:focus-visible { outline: 3px solid var(--signal); outline-offset: 4px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; }
.skip-link { position: fixed; left: 16px; top: -80px; z-index: 100; padding: 10px 16px; background: var(--ink); color: var(--white); }
.skip-link:focus { top: 16px; }

.site-header { width: min(calc(100% - 32px), var(--max)); min-height: 76px; margin: 18px auto 0; padding: 0 12px 0 18px; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 24px; background: rgba(248,250,248,.95); border: 1px solid var(--line); position: relative; z-index: 20; }
.brand { display: inline-flex; align-items: center; gap: 10px; font: 800 18px/1 var(--display); letter-spacing: .02em; white-space: nowrap; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border: 2px solid currentColor; font: 900 19px/1 var(--mono); position: relative; }
.brand-mark::after { content: ""; width: 5px; height: 5px; background: var(--signal); position: absolute; right: -3px; top: -3px; }
.site-nav { display: flex; justify-content: center; align-items: center; gap: clamp(12px, 1.4vw, 26px); font-size: 13px; font-weight: 700; }
.site-nav a { border-bottom: 2px solid transparent; padding: 25px 0 23px; white-space: nowrap; }
.site-nav a:hover { color: var(--signal-dark); border-color: var(--signal); }
.header-cta, .button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 24px; border: 1px solid var(--ink); font-size: 14px; font-weight: 800; transition: background .2s ease, color .2s ease, transform .2s ease; }
.header-cta { background: var(--ink); color: var(--white); min-width: 116px; }
.header-cta:hover, .button.primary:hover { background: var(--signal-dark); border-color: var(--signal-dark); transform: translateY(-2px); }
.nav-toggle { display: none; border: 0; background: none; padding: 12px; }
.nav-toggle span { display: block; width: 24px; height: 2px; margin: 5px; background: var(--ink); }

.hero { width: min(calc(100% - 32px), var(--max)); min-height: 720px; margin: 0 auto; display: grid; grid-template-columns: minmax(0, .88fr) minmax(480px, 1.12fr); align-items: center; border: 1px solid var(--line); border-top: 0; background: var(--panel); }
.hero-copy { padding: clamp(48px, 7vw, 104px); }
.instrument-label, .kicker { margin: 0 0 24px; color: var(--muted); font: 700 11px/1.4 var(--mono); letter-spacing: .14em; text-transform: uppercase; }
.instrument-label span { color: var(--signal-dark); }
.hero h1 { margin: 0; font: 900 clamp(48px, 6.1vw, 92px)/.96 var(--display); letter-spacing: -.055em; }
.hero h1 em { color: transparent; font-style: normal; -webkit-text-stroke: 1.5px var(--ink); }
.hero-lead { max-width: 630px; margin: 34px 0 0; color: var(--steel); font-size: 17px; }
.hero-actions { display: flex; align-items: center; gap: 26px; margin-top: 40px; }
.button.primary { color: var(--white); background: var(--signal); border-color: var(--signal); }
.text-link, .inline-route { font-size: 14px; font-weight: 800; border-bottom: 1px solid currentColor; }
.signal-strip { display: grid; grid-template-columns: 1.3fr 1fr 1fr; gap: 0; margin-top: 54px; border-block: 1px solid var(--line); }
.signal-strip > div { padding: 15px 12px 15px 0; border-right: 1px solid var(--line); }
.signal-strip > div + div { padding-left: 16px; }
.signal-strip > div:last-child { border-right: 0; }
.signal-strip b, .signal-strip small { display: block; }
.signal-strip b { font: 800 13px var(--mono); }
.signal-strip small { margin-top: 4px; color: var(--muted); font-size: 11px; }
.signal-dot { float: left; width: 8px; height: 8px; margin: 5px 8px 0 0; border-radius: 50%; background: #3b9e63; box-shadow: 0 0 0 5px rgba(59,158,99,.12); }
.hero-media { position: relative; background: #d7ddda; border-left: 1px solid var(--line); align-self: center; }
.hero-media::before, .hero-media::after { content: ""; position: absolute; z-index: 2; width: 46px; height: 46px; pointer-events: none; }
.hero-media::before { left: 14px; top: 46px; border-left: 1px solid var(--signal); border-top: 1px solid var(--signal); }
.hero-media::after { right: 14px; bottom: 14px; border-right: 1px solid var(--signal); border-bottom: 1px solid var(--signal); }
.media-calibration { height: 32px; padding: 0 14px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid var(--line); color: var(--steel); font: 700 10px var(--mono); letter-spacing: .08em; }
.section-shell { width: min(calc(100% - 32px), var(--max)); margin: 0 auto; padding: clamp(78px, 9vw, 132px) clamp(24px, 6vw, 92px); border-inline: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 50px; margin-bottom: 48px; }
.section-heading > p { max-width: 560px; margin: 0; color: var(--muted); }
.section-heading h2, .feature-intro h2, .partner-copy h2, .faq-aside h2, .contact-line h2 { margin: 0; font: 900 clamp(38px, 4.5vw, 68px)/1 var(--display); letter-spacing: -.04em; }
.section-heading .kicker { margin-bottom: 12px; }

.download-bay { background: #e2e6e3; }
.platform-rail { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--steel); }
.platform-card { min-width: 0; min-height: 350px; padding: 26px; display: flex; flex-direction: column; background: var(--panel); border-right: 1px solid var(--steel); }
.platform-card:last-child { border-right: 0; }
.platform-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 44px; }
.os-code { font: 900 22px var(--mono); letter-spacing: -.08em; }
.status-tag { padding: 4px 7px; color: var(--signal-dark); border: 1px solid currentColor; font: 700 9px var(--mono); }
.platform-card h3 { margin: 0; font: 800 28px var(--display); }
.version { margin: 5px 0 12px; color: var(--muted); font: 700 11px var(--mono); }
.platform-card > p:last-of-type { color: var(--steel); font-size: 13px; }
.platform-button { width: 100%; min-width: 180px; margin-top: auto; background: var(--ink); color: var(--white); white-space: nowrap; word-break: keep-all; writing-mode: horizontal-tb; }
.download-bay > .inline-route { display: table; margin: 30px 0 0 auto; }

.feature-lab { display: grid; grid-template-columns: 180px 1fr 1.65fr; gap: clamp(28px, 5vw, 80px); background: var(--panel); }
.lab-index { border-right: 1px solid var(--line); }
.lab-index span { color: var(--muted); font-size: 12px; writing-mode: vertical-rl; letter-spacing: .2em; }
.feature-intro p { margin: 30px 0 0; color: var(--muted); }
.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.feature-grid article { min-height: 190px; padding: 25px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.feature-grid article > span { color: var(--signal-dark); font: 800 11px var(--mono); }
.feature-grid h3 { margin: 24px 0 8px; font: 800 20px var(--display); }
.feature-grid p { margin: 0; color: var(--muted); font-size: 13px; }

.pricing-rack { background: #dfe4e1; }
.price-grid { display: grid; grid-template-columns: 1fr 1.08fr 1fr; align-items: end; gap: 14px; }
.price-grid article { min-height: 500px; padding: 38px; display: flex; flex-direction: column; background: var(--panel); border: 1px solid var(--line); }
.price-grid .price-focus { min-height: 550px; background: var(--deep); color: var(--white); border-color: var(--deep); }
.recommend { margin: -38px -38px 34px; padding: 10px 38px; color: var(--ink); background: var(--signal); font: 800 10px var(--mono); letter-spacing: .1em; }
.price-name { margin: 0; font-size: 17px; font-weight: 800; }
.price { margin: 32px 0 14px; font: 900 62px/1 var(--display); }
.price sup { font-size: 18px; }
.price small { font-size: 13px; color: var(--muted); }
.price-focus .price small, .price-focus > p:nth-of-type(3) { color: #aeb9bd; }
.price-grid ul { margin: 28px 0 36px; padding: 25px 0 0; border-top: 1px solid var(--line); list-style: none; }
.price-grid li { margin: 9px 0; font-size: 13px; }
.price-grid li::before { content: "—"; margin-right: 9px; color: var(--signal); }
.price-grid .button { width: 100%; margin-top: auto; white-space: nowrap; word-break: keep-all; writing-mode: horizontal-tb; }
.button.ghost { background: transparent; }
.button.ghost:hover { color: var(--white); background: var(--ink); }
.button.light { color: var(--ink); background: var(--white); border-color: var(--white); }

.data-console { width: min(calc(100% - 32px), var(--max)); margin: 0 auto; display: grid; grid-template-columns: 280px 1fr; color: var(--white); background: var(--deep); border-bottom: 5px solid var(--signal); }
.console-title { padding: 32px; display: flex; flex-direction: column; justify-content: space-between; border-right: 1px solid #3c494f; }
.console-title span { color: #9aa7ac; font: 700 10px var(--mono); }
.console-title b { font: 800 18px var(--display); }
.data-console dl { margin: 0; display: grid; grid-template-columns: repeat(4, 1fr); }
.data-console dl > div { padding: 36px 24px; border-right: 1px solid #3c494f; }
.data-console dl > div:last-child { border-right: 0; }
.data-console dt { font: 900 clamp(28px, 3vw, 46px) var(--display); }
.data-console dd { margin: 5px 0 0; color: #9aa7ac; font-size: 12px; }

.news-panel { display: grid; grid-template-columns: .85fr 1.15fr; gap: clamp(40px, 7vw, 100px); background: var(--panel); }
.news-visual { align-self: center; border: 1px solid var(--line); }
.news-visual img { display: block; width: 100%; height: auto; }
.news-visual p { margin: 0; padding: 12px 16px; display: flex; justify-content: space-between; gap: 10px; color: var(--muted); font-size: 11px; }
.news-visual p span { font-family: var(--mono); }
.section-heading.compact { margin-bottom: 20px; }
.news-list article { padding: 25px 0; display: grid; grid-template-columns: 105px 1fr; gap: 20px; border-top: 1px solid var(--line); }
.news-list time { color: var(--signal-dark); font: 700 11px var(--mono); }
.news-list h3 { margin: 0; font-size: 17px; line-height: 1.45; }
.news-list h3 a:hover { color: var(--signal-dark); }
.news-list p { margin: 7px 0 0; color: var(--muted); font-size: 13px; }

.partner-module { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(50px, 9vw, 150px); color: var(--white); background: var(--signal-dark); }
.partner-copy .kicker { color: #ffd4c9; }
.partner-copy p:not(.kicker) { max-width: 570px; margin: 28px 0 38px; color: #ffd4c9; }
.partner-meter { display: flex; flex-direction: column; justify-content: center; }
.partner-meter > div { padding: 25px 0; display: grid; grid-template-columns: 1fr auto; gap: 10px; border-bottom: 1px solid rgba(255,255,255,.28); }
.partner-meter span { font-size: 13px; }
.partner-meter b { font: 800 26px var(--mono); }
.partner-meter i { grid-column: 1 / -1; width: 100%; height: 4px; background: rgba(255,255,255,.18); }
.partner-meter i::after { content: ""; display: block; width: var(--level); height: 100%; background: var(--white); }

.faq-deck { display: grid; grid-template-columns: .65fr 1.35fr; gap: clamp(45px, 8vw, 120px); background: #e1e5e2; }
.faq-aside { align-self: start; position: sticky; top: 24px; }
.faq-aside > p:not(.kicker) { color: var(--muted); }
.faq-aside img { display: block; width: 100%; height: auto; margin: 28px 0 20px; border: 1px solid var(--line); }
.faq-list details { border-top: 1px solid var(--steel); }
.faq-list details:last-child { border-bottom: 1px solid var(--steel); }
.faq-list summary { padding: 26px 45px 26px 0; cursor: pointer; list-style: none; font: 800 18px var(--display); position: relative; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; position: absolute; right: 5px; font: 400 28px/1 var(--mono); }
.faq-list details[open] summary::after { content: "−"; }
.faq-list details p { margin: -6px 50px 25px 0; color: var(--muted); font-size: 14px; }
.contact-line { padding-block: 55px; display: flex; align-items: center; justify-content: space-between; gap: 40px; background: var(--panel); }
.contact-line h2 { font-size: clamp(30px, 3vw, 46px); }
.contact-line p:not(.kicker) { margin: 12px 0 0; color: var(--muted); }

.site-footer { width: min(calc(100% - 32px), var(--max)); margin: 0 auto 28px; padding: 62px clamp(24px, 6vw, 92px) 24px; color: #c4cdd0; background: #0f1518; }
.brand.inverse { color: var(--white); }
.footer-brand { display: flex; align-items: center; justify-content: space-between; gap: 30px; padding-bottom: 46px; border-bottom: 1px solid #334047; }
.footer-brand p { margin: 0; color: #7f8c91; }
.footer-map { padding: 48px 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.footer-map h2 { margin: 0 0 17px; color: #7f8c91; font: 700 11px var(--mono); letter-spacing: .1em; }
.footer-map a { display: block; margin: 9px 0; font-size: 13px; }
.footer-map a:hover { color: var(--signal); }
.footer-base { padding-top: 22px; display: flex; justify-content: space-between; gap: 20px; border-top: 1px solid #334047; color: #66747a; font-size: 11px; }

/* inner pages */
.inner-hero { width: min(calc(100% - 32px), var(--max)); margin: 0 auto; padding: clamp(70px, 9vw, 130px) clamp(24px, 6vw, 92px); display: grid; grid-template-columns: 1.2fr .8fr; gap: 70px; align-items: center; border-inline: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--panel); }
.inner-hero h1 { max-width: 850px; margin: 0; font: 900 clamp(46px, 6vw, 86px)/.98 var(--display); letter-spacing: -.055em; }
.inner-hero p:not(.kicker) { max-width: 700px; color: var(--muted); font-size: 17px; }
.inner-plate { padding: 24px; border: 1px solid var(--steel); background: #dfe4e1; }
.inner-plate img { display: block; width: 100%; height: auto; }
.inner-plate span { display: flex; justify-content: space-between; margin-top: 15px; font: 700 10px var(--mono); }
.download-table { background: #e1e5e2; }
.download-row { padding: 28px 0; display: grid; grid-template-columns: 120px 1fr 1.3fr auto; align-items: center; gap: 28px; border-top: 1px solid var(--steel); }
.download-row:last-child { border-bottom: 1px solid var(--steel); }
.download-row .os-code { font-size: 28px; }
.download-row h2 { margin: 0; font: 800 25px var(--display); }
.download-row p { margin: 5px 0 0; color: var(--muted); font-size: 13px; }
.requirements { font: 700 11px var(--mono); color: var(--steel); }
.download-row .button { min-width: 190px; white-space: nowrap; word-break: keep-all; writing-mode: horizontal-tb; }
.steps-line { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); }
.steps-line article { padding: 32px; border-right: 1px solid var(--line); }
.steps-line article:last-child { border-right: 0; }
.steps-line span { color: var(--signal-dark); font: 800 11px var(--mono); }
.steps-line h3 { margin: 32px 0 8px; font: 800 21px var(--display); }
.steps-line p { margin: 0; color: var(--muted); font-size: 13px; }
.help-layout { display: grid; grid-template-columns: 290px 1fr; gap: 70px; background: #e1e5e2; }
.help-index { align-self: start; position: sticky; top: 24px; padding: 26px; background: var(--deep); color: var(--white); }
.help-index h2 { margin: 0 0 22px; font: 800 18px var(--display); }
.help-index a { display: block; padding: 11px 0; border-top: 1px solid #415057; color: #c0c9cc; font-size: 13px; }
.help-index a:hover { color: var(--signal); }
.help-content article { padding: 36px 0; border-top: 1px solid var(--steel); }
.help-content article:last-child { border-bottom: 1px solid var(--steel); }
.help-content h2 { margin: 0 0 16px; font: 800 clamp(25px, 3vw, 38px) var(--display); }
.help-content h3 { margin: 25px 0 9px; font-size: 16px; }
.help-content p, .help-content li { color: var(--steel); }
.help-content ol, .help-content ul { padding-left: 20px; }
.support-box { margin-top: 26px; padding: 24px; display: flex; align-items: center; justify-content: space-between; gap: 30px; color: var(--white); background: var(--signal-dark); }

@media (max-width: 1180px) {
  .site-header { grid-template-columns: auto auto 1fr; }
  .nav-toggle { display: block; grid-column: 3; justify-self: end; }
  .header-cta { grid-column: 2; grid-row: 1; }
  .site-nav { display: none; position: absolute; left: 0; right: 0; top: calc(100% + 1px); padding: 14px 20px 20px; grid-template-columns: repeat(2, 1fr); background: var(--panel); border: 1px solid var(--line); }
  .site-nav.open { display: grid; }
  .site-nav a { padding: 11px 0; }
  .hero { grid-template-columns: 1fr 1fr; }
  .hero-copy { padding: 56px; }
  .platform-rail { grid-template-columns: repeat(2, 1fr); }
  .platform-card:nth-child(2) { border-right: 0; }
  .platform-card:nth-child(-n+2) { border-bottom: 1px solid var(--steel); }
  .feature-lab { grid-template-columns: 100px 1fr; }
  .feature-grid { grid-column: 1 / -1; }
  .data-console { grid-template-columns: 1fr; }
  .console-title { min-height: 110px; border-right: 0; border-bottom: 1px solid #3c494f; }
}

@media (max-width: 820px) {
  .site-header { min-height: 68px; margin-top: 8px; }
  .header-cta { display: none; }
  .nav-toggle { grid-column: 3; }
  .hero, .inner-hero { grid-template-columns: 1fr; min-height: 0; }
  .hero-copy { padding: 60px 28px 45px; }
  .hero-media { border-left: 0; border-top: 1px solid var(--line); }
  .hero-actions, .section-heading, .footer-brand, .contact-line { align-items: flex-start; flex-direction: column; }
  .section-heading { display: flex; }
  .signal-strip { margin-top: 40px; }
  .section-shell { padding: 72px 26px; }
  .platform-rail, .price-grid, .data-console dl, .news-panel, .partner-module, .faq-deck, .footer-map, .steps-line { grid-template-columns: 1fr; }
  .platform-card { border-right: 0; border-bottom: 1px solid var(--steel); }
  .platform-card:last-child { border-bottom: 0; }
  .feature-lab { grid-template-columns: 1fr; }
  .lab-index { padding-bottom: 20px; border-right: 0; border-bottom: 1px solid var(--line); }
  .lab-index span { writing-mode: horizontal-tb; }
  .price-grid article, .price-grid .price-focus { min-height: 0; }
  .data-console dl > div { border-right: 0; border-bottom: 1px solid #3c494f; }
  .news-panel { gap: 50px; }
  .partner-module { gap: 60px; }
  .faq-aside, .help-index { position: static; }
  .footer-map { gap: 30px; }
  .footer-base { flex-direction: column; }
  .download-row { grid-template-columns: 80px 1fr; }
  .download-row .requirements, .download-row .button { grid-column: 2; }
  .steps-line article { border-right: 0; border-bottom: 1px solid var(--line); }
  .steps-line article:last-child { border-bottom: 0; }
  .help-layout { grid-template-columns: 1fr; gap: 45px; }
}

@media (max-width: 520px) {
  .site-header, .hero, .section-shell, .data-console, .inner-hero, .site-footer { width: calc(100% - 16px); }
  .brand { font-size: 15px; }
  .brand-mark { width: 30px; height: 30px; }
  .hero h1 { font-size: 48px; }
  .hero-actions { gap: 18px; }
  .button { width: 100%; }
  .signal-strip { grid-template-columns: 1fr; }
  .signal-strip > div { border-right: 0; border-bottom: 1px solid var(--line); padding: 14px 0; }
  .signal-strip > div + div { padding-left: 0; }
  .signal-strip > div:last-child { border-bottom: 0; }
  .feature-grid { grid-template-columns: 1fr; }
  .news-list article { grid-template-columns: 1fr; gap: 8px; }
  .download-row { grid-template-columns: 1fr; }
  .download-row .requirements, .download-row .button { grid-column: 1; }
  .support-box { align-items: flex-start; flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

/* Hero media requirements: keep this final override authoritative. */
.hero { align-items: center !important; }
.hero-media { align-self: center !important; height: auto !important; padding: 0 !important; margin-top: 0 !important; margin-bottom: 0 !important; overflow: visible !important; transform: none !important; clip-path: none !important; }
.hero-media > img { display: block !important; width: 100% !important; height: auto !important; min-height: 0 !important; max-height: none !important; margin: 0 !important; padding: 0 !important; object-fit: contain !important; object-position: center !important; transform: none !important; clip-path: none !important; }