:root {
  --ink: #0d1628;
  --muted: #566176;
  --line: #cfd6e4;
  --paper: #f7f9fc;
  --white: #ffffff;
  --blue: #175cf4;
  --blue-dark: #0b3fb4;
  --green: #a8f03a;
  --coral: #ff625d;
  --rail: min(1160px, calc(100% - 48px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif; line-height: 1.72; letter-spacing: 0; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }
button, a { -webkit-tap-highlight-color: transparent; }

.site-header { position: sticky; top: 0; z-index: 50; background: rgba(247, 249, 252, .96); border-bottom: 1px solid var(--line); }
.header-inner { width: var(--rail); min-height: 74px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-size: 23px; font-weight: 800; }
.brand img { width: 40px; height: 40px; border-radius: 6px; }
.main-nav { display: flex; align-items: center; gap: 30px; font-size: 15px; font-weight: 650; }
.main-nav > a:not(.nav-download) { padding: 22px 0 18px; border-bottom: 3px solid transparent; }
.main-nav > a.active, .main-nav > a:not(.nav-download):hover { border-color: var(--blue); }
.nav-download { background: var(--ink); color: var(--white); padding: 10px 18px; border: 1px solid var(--ink); }
.menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); background: var(--white); color: var(--ink); font-size: 24px; line-height: 1; }

.hero { overflow: hidden; background: var(--paper); border-bottom: 1px solid var(--line); }
.hero-inner { width: var(--rail); min-height: 690px; margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1fr) minmax(440px, .9fr); align-items: center; gap: 72px; padding: 44px 0 48px; }
.hero-copy { position: relative; z-index: 2; }
.eyebrow { display: inline-flex; align-items: center; gap: 9px; color: var(--blue-dark); font-size: 13px; font-weight: 800; text-transform: uppercase; }
.pulse { width: 9px; height: 9px; background: var(--green); border: 2px solid var(--ink); border-radius: 50%; box-shadow: 12px 0 0 var(--coral); margin-right: 12px; }
h1, h2, h3, p { margin-top: 0; }
.hero h1 { max-width: 640px; margin: 14px 0 20px; font-size: clamp(46px, 4.4vw, 64px); line-height: 1.08; font-weight: 900; }
.hero-copy > p { max-width: 610px; margin-bottom: 26px; color: var(--muted); font-size: 17px; }
.hero-actions { display: flex; align-items: center; gap: 25px; }
.button { display: inline-flex; min-height: 48px; padding: 11px 24px; align-items: center; justify-content: center; border: 2px solid transparent; font-weight: 800; }
.button-primary { color: var(--white); background: var(--blue); border-color: var(--blue); box-shadow: 7px 7px 0 var(--ink); }
.button-primary:hover { transform: translate(2px, 2px); box-shadow: 5px 5px 0 var(--ink); }
.text-link { color: var(--ink); font-weight: 800; border-bottom: 2px solid var(--green); }
.signal-list { display: grid; grid-template-columns: repeat(3, 1fr); max-width: 520px; margin: 42px 0 0; padding: 0; border-top: 1px solid var(--line); }
.signal-list div { padding: 15px 12px 0 0; }
.signal-list dt { color: var(--blue); font-size: 12px; font-weight: 900; }
.signal-list dd { margin: 2px 0 0; font-size: 14px; font-weight: 750; }
.hero-media { position: relative; min-height: 590px; display: flex; align-items: center; justify-content: center; }
.phone-frame { position: relative; z-index: 3; width: 320px; margin: 0; padding: 10px; background: var(--white); border: 2px solid var(--ink); box-shadow: 16px 18px 0 rgba(23, 92, 244, .18); transform: rotate(1.3deg); }
.phone-frame img { width: 100%; max-width: 400px; }
.signal-band { position: absolute; z-index: 1; width: 410px; height: 98px; border: 1px solid var(--ink); display: flex; align-items: center; padding: 0 20px; font-size: 12px; font-weight: 900; }
.signal-band span { writing-mode: vertical-rl; }
.band-a { top: 94px; right: 0; background: var(--green); transform: rotate(-4deg); }
.band-b { bottom: 92px; left: 0; color: var(--white); background: var(--coral); transform: rotate(4deg); justify-content: flex-end; }
.capability-strip { position: absolute; z-index: 4; right: -8px; bottom: 38px; display: flex; border: 2px solid var(--ink); background: var(--white); transform: rotate(-2deg); }
.capability-strip span { padding: 8px 10px; border-right: 1px solid var(--ink); font-size: 11px; font-weight: 800; white-space: nowrap; }
.capability-strip span:last-child { border-right: 0; }

.section { padding: 88px 0; }
.section-inner { width: var(--rail); margin: 0 auto; }
.section-functions { background: var(--white); }
.section-heading { display: grid; grid-template-columns: 160px minmax(200px, .8fr) minmax(260px, 1fr); align-items: end; gap: 28px; margin-bottom: 44px; }
.section-index { color: var(--blue); font-size: 12px; font-weight: 900; }
.section-heading h2 { margin: 0; font-size: 38px; line-height: 1.15; }
.section-note { color: var(--muted); font-size: 15px; }
.function-grid { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 2px solid var(--ink); border-bottom: 2px solid var(--ink); }
.function-item { min-width: 0; padding: 28px 24px 30px; border-right: 1px solid var(--line); }
.function-item:last-child { border-right: 0; }
.function-item > span { display: block; color: var(--blue); font-size: 12px; font-weight: 900; }
.function-item h3 { margin: 14px 0 9px; font-size: 21px; }
.function-item p { margin: 0; color: var(--muted); font-size: 14px; }

.section-gallery { background: var(--ink); color: var(--white); }
.section-gallery .section-heading { grid-template-columns: 160px 1fr; }
.section-gallery .section-index { color: var(--green); }
.gallery-layout { display: grid; grid-template-columns: 1.2fr .8fr; gap: 34px; align-items: end; }
.gallery-layout figure { margin: 0; }
.image-stage { min-height: 560px; display: flex; align-items: center; justify-content: center; padding: 28px; background: #151f34; border: 1px solid #34415a; overflow: hidden; }
.gallery-side .image-stage { min-height: 490px; background: var(--green); }
.image-stage img { width: auto; max-width: 100%; max-height: 610px; object-fit: contain; box-shadow: 0 20px 48px rgba(0,0,0,.34); }
.gallery-layout figcaption { display: flex; justify-content: space-between; gap: 20px; padding-top: 16px; font-size: 14px; }
.gallery-layout figcaption span { color: #aeb8cb; }
.gallery-side figcaption span { color: #aeb8cb; }

.section-path { background: var(--paper); }
.path-layout { display: grid; grid-template-columns: .72fr 1.28fr; gap: 80px; }
.path-layout .section-heading { display: block; margin: 0; }
.path-layout .section-heading h2 { margin-top: 14px; }
.path-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink); }
.path-list li { display: grid; grid-template-columns: 72px 1fr; gap: 18px; padding: 25px 0; border-bottom: 1px solid var(--line); }
.path-list > li > span { color: var(--blue); font-size: 13px; font-weight: 900; }
.path-list h3 { margin-bottom: 5px; font-size: 20px; }
.path-list p { margin: 0; color: var(--muted); }
.section-deep { padding-top: 0; }
.deep-grid { display: grid; grid-template-columns: 1fr 1fr; border: 2px solid var(--ink); }
.deep-link { position: relative; min-height: 270px; padding: 34px; background: var(--green); border-right: 2px solid var(--ink); }
.deep-link:last-child { border-right: 0; }
.deep-link-dark { color: var(--white); background: var(--blue); }
.deep-link > span { font-size: 12px; font-weight: 900; }
.deep-link h2 { margin: 42px 0 9px; font-size: 34px; }
.deep-copy { max-width: 420px; }
.deep-link b { position: absolute; right: 30px; top: 26px; font-size: 34px; }

.download-band { padding: 62px 0; color: var(--white); background: var(--blue); }
.download-band-inner { display: flex; align-items: center; justify-content: space-between; gap: 40px; }
.download-band h2 { margin: 7px 0 4px; font-size: 36px; }
.download-copy { color: #dfe8ff; }
.download-band .eyebrow { color: var(--green); }
.button-light { color: var(--ink); background: var(--white); border-color: var(--white); box-shadow: 7px 7px 0 var(--ink); white-space: nowrap; }

.inner-hero { position: relative; overflow: hidden; min-height: 430px; display: flex; align-items: center; color: var(--white); background: var(--ink); border-bottom: 10px solid var(--green); }
.inner-hero-faq { border-color: var(--coral); }
.inner-hero-bg { position: absolute; right: -20px; bottom: -85px; color: rgba(255,255,255,.055); font-size: 170px; line-height: 1; font-weight: 900; white-space: nowrap; }
.inner-hero-content { position: relative; padding: 62px 0; }
.inner-hero-content h1 { max-width: 900px; margin: 13px 0 16px; font-size: clamp(42px, 4.2vw, 60px); line-height: 1.12; }
.inner-hero-content p { max-width: 700px; color: #c2cada; font-size: 17px; }
.inner-hero-content .button { margin-top: 8px; }
.guide-section { background: var(--white); }
.guide-layout { display: grid; grid-template-columns: 220px 1fr; gap: 70px; align-items: start; }
.guide-nav { position: sticky; top: 105px; display: grid; gap: 8px; padding: 20px 0; border-top: 2px solid var(--ink); border-bottom: 1px solid var(--line); }
.guide-nav strong { margin-bottom: 9px; }
.guide-nav a { color: var(--muted); font-size: 14px; }
.guide-nav a:hover { color: var(--blue); }
.guide-content { max-width: 790px; }
.guide-block { position: relative; padding: 0 0 48px 70px; scroll-margin-top: 100px; }
.guide-block + .guide-block { padding-top: 42px; border-top: 1px solid var(--line); }
.guide-number { position: absolute; left: 0; top: 3px; color: var(--blue); font-size: 13px; font-weight: 900; }
.guide-block h2 { margin-bottom: 16px; font-size: 30px; }
.guide-block p { color: #3e495d; }
.guide-block a { color: var(--blue-dark); font-weight: 750; border-bottom: 1px solid var(--blue); }
.mode-table { margin: 20px 0 24px; border-top: 2px solid var(--ink); }
.mode-table > div { display: grid; grid-template-columns: 140px 1fr; gap: 24px; padding: 16px; border-bottom: 1px solid var(--line); }
.mode-table b { color: var(--blue); }

.faq-section { background: var(--white); }
.faq-layout { display: grid; grid-template-columns: 320px 1fr; gap: 70px; align-items: start; }
.faq-intro { position: sticky; top: 105px; }
.faq-intro h2 { margin: 12px 0 16px; font-size: 40px; }
.faq-intro p { color: var(--muted); }
.faq-list { border-top: 2px solid var(--ink); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { position: relative; list-style: none; cursor: pointer; padding: 24px 52px 24px 0; font-size: 18px; font-weight: 800; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: '+'; position: absolute; right: 8px; top: 18px; color: var(--blue); font-size: 29px; line-height: 1; }
.faq-list details[open] summary::after { content: '−'; }
.faq-list details div { padding: 0 52px 20px 0; color: var(--muted); }
.faq-list details p { margin-bottom: 0; }
.support-rail { background: var(--green); border-top: 2px solid var(--ink); border-bottom: 2px solid var(--ink); }
.support-rail-inner { display: grid; grid-template-columns: repeat(3, 1fr); }
.support-rail-inner div { display: flex; align-items: center; gap: 15px; padding: 23px; border-right: 1px solid var(--ink); }
.support-rail-inner div:last-child { border-right: 0; }
.support-rail-inner span { font-size: 12px; font-weight: 900; }

.site-footer { padding: 46px 0 34px; color: #b9c1d1; background: var(--ink); }
.footer-inner { width: var(--rail); margin: 0 auto; text-align: center; }
.footer-brand { display: flex; justify-content: center; align-items: center; gap: 10px; color: var(--white); font-size: 20px; }
.footer-brand img { border-radius: 5px; }
.site-footer nav { display: flex; justify-content: center; gap: 25px; margin: 24px 0; font-size: 14px; }
.site-footer nav a:hover { color: var(--white); }
.disclaimer { margin: 0 auto 8px; text-align: center; font-size: 13px; }
.copyright { margin: 0; text-align: center; font-size: 12px; }

@media (max-width: 900px) {
  :root { --rail: min(100% - 32px, 680px); }
  .header-inner { min-height: 66px; }
  .brand img { width: 36px; height: 36px; }
  .menu-toggle { display: inline-grid; place-items: center; }
  .main-nav { position: absolute; top: 66px; left: 16px; right: 16px; display: none; padding: 12px; background: var(--white); border: 1px solid var(--ink); box-shadow: 8px 8px 0 rgba(13,22,40,.14); }
  .main-nav.is-open { display: grid; }
  .main-nav > a:not(.nav-download) { padding: 10px 8px; border: 0; }
  .nav-download { text-align: center; }
  .hero-inner { min-height: auto; grid-template-columns: 1fr; gap: 22px; padding: 34px 0 30px; }
  .hero h1 { max-width: 9em; margin: 11px 0 13px; font-size: 43px; }
  .hero-copy > p { margin-bottom: 19px; font-size: 15px; }
  .hero-actions { gap: 18px; }
  .signal-list { margin-top: 25px; }
  .hero-media { min-height: 345px; margin-top: 2px; }
  .phone-frame { width: 190px; padding: 6px; box-shadow: 9px 10px 0 rgba(23,92,244,.18); }
  .signal-band { width: 280px; height: 58px; }
  .band-a { top: 45px; right: 8px; }
  .band-b { bottom: 44px; left: 8px; }
  .capability-strip { right: 0; bottom: 11px; }
  .capability-strip span { padding: 5px 6px; font-size: 9px; }
  .section { padding: 62px 0; }
  .section-heading { grid-template-columns: 1fr; gap: 10px; margin-bottom: 30px; }
  .section-heading h2 { font-size: 32px; }
  .function-grid { grid-template-columns: 1fr 1fr; }
  .function-item:nth-child(2) { border-right: 0; }
  .function-item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .gallery-layout { grid-template-columns: 1fr 1fr; gap: 14px; }
  .image-stage, .gallery-side .image-stage { min-height: 360px; padding: 12px; }
  .image-stage img { max-height: 410px; }
  .gallery-layout figcaption { display: block; }
  .gallery-layout figcaption span { display: block; margin-top: 3px; }
  .path-layout { grid-template-columns: 1fr; gap: 30px; }
  .deep-grid { grid-template-columns: 1fr; }
  .deep-link { min-height: 230px; border-right: 0; border-bottom: 2px solid var(--ink); }
  .deep-link:last-child { border-bottom: 0; }
  .download-band-inner { align-items: flex-start; }
  .guide-layout, .faq-layout { grid-template-columns: 1fr; gap: 35px; }
  .guide-nav, .faq-intro { position: static; }
}

@media (max-width: 560px) {
  :root { --rail: calc(100% - 28px); }
  .hero-inner { padding-top: 27px; }
  .hero h1 { font-size: 38px; }
  .hero-copy > p { line-height: 1.65; }
  .button { min-height: 44px; padding: 9px 18px; }
  .hero-actions { flex-wrap: wrap; }
  .signal-list { font-size: 13px; }
  .hero-media { min-height: 310px; }
  .phone-frame { width: 172px; }
  .signal-band { width: 250px; }
  .section { padding: 52px 0; }
  .function-grid { grid-template-columns: 1fr; }
  .function-item { border-right: 0; border-bottom: 1px solid var(--line); }
  .function-item:last-child { border-bottom: 0; }
  .gallery-layout { grid-template-columns: 1fr 1fr; }
  .image-stage, .gallery-side .image-stage { min-height: 295px; padding: 8px; }
  .image-stage img { max-height: 310px; }
  .gallery-layout figcaption { font-size: 12px; }
  .gallery-layout figcaption span { display: none; }
  .path-list li { grid-template-columns: 44px 1fr; }
  .deep-link { padding: 26px; }
  .deep-link h2 { margin-top: 30px; font-size: 29px; }
  .download-band { padding: 45px 0; }
  .download-band-inner { display: grid; }
  .download-band h2 { font-size: 29px; }
  .inner-hero { min-height: 390px; }
  .inner-hero-bg { font-size: 92px; bottom: -36px; }
  .inner-hero-content { padding: 52px 0; }
  .inner-hero-content h1 { font-size: 39px; }
  .inner-hero-content p { font-size: 15px; }
  .guide-block { padding-left: 42px; }
  .mode-table > div { grid-template-columns: 1fr; gap: 5px; }
  .faq-intro h2 { font-size: 34px; }
  .faq-list summary { padding-right: 40px; font-size: 16px; }
  .faq-list details div { padding-right: 12px; }
  .support-rail-inner { grid-template-columns: 1fr; }
  .support-rail-inner div { border-right: 0; border-bottom: 1px solid var(--ink); }
  .support-rail-inner div:last-child { border-bottom: 0; }
  .site-footer nav { gap: 16px; }
}

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