:root {
  --indigo: #101a3b;
  --indigo-deep: #090f26;
  --red: #ee3358;
  --red-dark: #a91838;
  --silver: #aeb8c7;
  --silver-light: #e8ecf1;
  --white: #fff;
  --ink: #161a23;
  --muted: #627083;
  --line: rgba(16, 26, 59, .16);
  --light-line: rgba(255, 255, 255, .18);
  --sans: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --display: "Songti SC", "STSong", "Noto Serif SC", Georgia, serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 122px; }
body { margin: 0; color: var(--ink); background: var(--white); font-family: var(--sans); line-height: 1.78; -webkit-font-smoothing: antialiased; overflow-wrap: anywhere; }
::selection { color: var(--white); background: var(--red); }
h1, h2, h3, p, figure, dl, dd { margin-top: 0; }
img { display: block; max-width: 100%; }

.site-shell { width: min(1440px, calc(100% - 72px)); margin-inline: auto; }
.skip-link { position: fixed; left: 18px; top: -70px; z-index: 100; padding: 10px 15px; color: var(--white); background: var(--red-dark); text-decoration: none; }
.skip-link:focus { top: 16px; }

.site-header { position: sticky; top: 0; z-index: 40; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(14px); }
.signal-strip { color: var(--white); background: var(--indigo); }
.signal-strip-inner { min-height: 30px; display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 24px; font-size: 8px; font-weight: 800; letter-spacing: .16em; }
.signal-strip-inner span:nth-child(2) { color: var(--red); }
.signal-strip-inner span:last-child { text-align: right; }

.header-main { min-height: 88px; display: grid; grid-template-columns: minmax(220px,.62fr) minmax(0,1.38fr); align-items: center; gap: 34px; }
.brand-lockup { width: max-content; display: inline-flex; align-items: center; gap: 14px; }
.brand-logo { width: 47px; height: 47px; object-fit: contain; }
.brand-lockup strong { display: block; font-family: var(--display); font-size: 23px; letter-spacing: .08em; }
.brand-lockup span { display: block; margin-top: -2px; color: var(--muted); font-size: 8px; font-weight: 800; letter-spacing: .2em; }
.site-nav { display: flex; justify-content: flex-end; gap: clamp(13px,1.55vw,25px); }
.site-nav a { position: relative; padding: 29px 0 25px; color: var(--indigo); font-size: 12px; font-weight: 720; text-decoration: none; white-space: nowrap; }
.site-nav a::after { content: ""; position: absolute; left: 0; right: 100%; bottom: 18px; height: 2px; background: var(--red); transition: right .2s ease; }
.site-nav a:hover, .site-nav a:focus-visible, .site-nav a[aria-current="page"] { color: var(--red-dark); }
.site-nav a:hover::after, .site-nav a:focus-visible::after, .site-nav a[aria-current="page"]::after { right: 0; }
.site-nav a:focus-visible { outline: 2px solid var(--red); outline-offset: 7px; }
.nav-toggle { display: none; border: 0; color: var(--indigo); background: transparent; font: inherit; cursor: pointer; }

.signal-hero { padding: 54px 0 0; background: var(--white); }
.hero-layout { min-height: 620px; display: grid; grid-template-columns: minmax(0,1.08fr) minmax(400px,.92fr); gap: 74px; align-items: center; }
.hero-copy-block { padding: 30px 0; }
.eyebrow, .section-id { color: var(--red-dark); font-size: 10px; font-weight: 850; letter-spacing: .18em; text-transform: uppercase; }
.eyebrow { display: flex; align-items: center; gap: 12px; margin-bottom: 22px; }
.eyebrow span { width: 48px; height: 2px; background: var(--red); }
.signal-hero h1 { max-width: 900px; margin-bottom: 26px; font-family: var(--display); font-size: clamp(52px,6vw,92px); font-weight: 600; letter-spacing: -.05em; line-height: 1.02; }
.hero-slogan { max-width: 720px; margin-bottom: 15px; color: var(--red-dark); font-family: var(--display); font-size: clamp(21px,2.1vw,30px); }
.hero-intro { max-width: 720px; margin-bottom: 0; color: var(--muted); font-size: 15px; }
.hero-frequency { margin-top: 34px; display: grid; grid-template-columns: repeat(3,1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.hero-frequency div { padding: 14px 18px; border-right: 1px solid var(--line); }
.hero-frequency div:last-child { border-right: 0; }
.hero-frequency span { display: block; color: var(--muted); font-size: 8px; font-weight: 800; letter-spacing: .15em; }
.hero-frequency strong { display: block; margin-top: 4px; font-family: var(--display); font-size: 17px; }

.media-frame { position: relative; margin: 0; overflow: hidden; background: var(--silver); }
.media-frame img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.hero-visual-stack { min-width: 0; }
.visual-status { min-height: 44px; padding: 0 16px; display: flex; align-items: center; justify-content: space-between; color: var(--white); background: var(--indigo); font-size: 9px; font-weight: 800; letter-spacing: .14em; }
.visual-status strong { color: var(--red); }
.hero-image { min-height: 500px; }
.hero-band { margin-top: 54px; display: grid; grid-template-columns: repeat(4,1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.hero-band article { min-height: 190px; padding: 28px; border-right: 1px solid var(--line); }
.hero-band article:last-child { border-right: 0; }
.hero-band span { color: var(--red); font-size: 10px; font-weight: 850; }
.hero-band h2 { margin: 36px 0 10px; font-family: var(--display); font-size: 24px; line-height: 1.2; }
.hero-band p { margin-bottom: 0; color: var(--muted); font-size: 13px; }

.section-head { margin-bottom: 64px; display: grid; grid-template-columns: 210px minmax(0,1fr); gap: 60px; align-items: start; }
.signal-line { display: block; width: 90px; height: 2px; margin-top: 16px; background: var(--red); }
.section-head h2, .featured-heading h2, .announcement-copy h2, .terminal-copy h2, .faq-intro h2, .disclosure-copy h2 { margin-bottom: 18px; font-family: var(--display); font-size: clamp(42px,5.3vw,76px); font-weight: 600; letter-spacing: -.04em; line-height: 1.08; }
.section-head > div > p:last-child, .featured-heading > p, .announcement-copy > p, .terminal-copy > p, .disclosure-copy > p { max-width: 790px; color: var(--muted); font-size: 16px; }

.channel-center { padding: 124px 0; background: var(--white); }
.channel-layout { display: grid; grid-template-columns: minmax(0,1.2fr) minmax(360px,.8fr); gap: 72px; align-items: stretch; }
.channel-register { border-top: 1px solid var(--line); }
.channel-register article { padding: 25px 0; display: grid; grid-template-columns: 70px minmax(0,1fr) 110px; gap: 24px; border-bottom: 1px solid var(--line); }
.channel-register article > span { color: var(--red-dark); font-size: 9px; font-weight: 850; letter-spacing: .1em; }
.channel-register h3 { margin-bottom: 8px; font-family: var(--display); font-size: 25px; }
.channel-register p { margin-bottom: 0; color: var(--muted); font-size: 13px; }
.channel-register em { color: var(--muted); font-size: 10px; font-style: normal; text-align: right; }
.channel-image { min-height: 660px; }

.featured-signal { padding: 124px 0; color: var(--white); background: var(--red-dark); }
.featured-grid { display: grid; grid-template-columns: minmax(330px,.72fr) minmax(0,1.05fr) minmax(250px,.55fr); gap: 38px; align-items: end; }
.featured-heading { align-self: start; padding-right: 30px; }
.featured-heading .section-id { color: #ffd0d9; }
.featured-heading > p { color: #f0c2cb; }
.featured-heading dl { margin: 34px 0 0; border-top: 1px solid var(--light-line); }
.featured-heading dl div { padding: 11px 0; display: grid; grid-template-columns: 140px 1fr; gap: 16px; border-bottom: 1px solid var(--light-line); }
.featured-heading dt { color: #ffd0d9; font-weight: 740; }
.featured-heading dd { color: #f0c2cb; }
.featured-main { min-height: 640px; }
.featured-note { display: grid; gap: 20px; }
.featured-small { aspect-ratio: 1; }
.featured-note p { margin-bottom: 0; color: #f0c2cb; font-size: 12px; }
.featured-note span { display: block; margin-bottom: 7px; color: var(--white); font-weight: 850; letter-spacing: .14em; }

.announcement-system { padding: 124px 0; color: var(--white); background: var(--indigo-deep); }
.announcement-grid { display: grid; grid-template-columns: minmax(360px,.8fr) minmax(0,1.2fr); gap: 82px; align-items: stretch; }
.announcement-image { min-height: 720px; }
.announcement-copy { padding: 24px 0; }
.announcement-copy .section-id { color: var(--red); }
.announcement-copy > p { color: var(--silver); }
.announcement-list { margin-top: 48px; border-top: 1px solid var(--light-line); }
.announcement-list article { padding: 24px 0; display: grid; grid-template-columns: 92px 1fr 120px; gap: 22px; border-bottom: 1px solid var(--light-line); }
.announcement-list span { color: var(--red); font-size: 9px; font-weight: 850; }
.announcement-list h3 { margin-bottom: 7px; font-family: var(--display); font-size: 24px; }
.announcement-list p { margin-bottom: 0; color: var(--silver); font-size: 13px; }
.announcement-list em { color: var(--silver); font-size: 10px; font-style: normal; text-align: right; }

.support-center { padding: 124px 0; background: var(--white); }
.support-console { display: grid; grid-template-columns: repeat(3,1fr); border: 1px solid var(--line); }
.support-console article { min-height: 330px; padding: 34px; border-right: 1px solid var(--line); }
.support-console article:last-child { border-right: 0; }
.support-console span { color: var(--red-dark); font-size: 9px; font-weight: 850; letter-spacing: .12em; }
.support-console h3 { margin: 70px 0 14px; font-family: var(--display); font-size: 28px; line-height: 1.2; }
.support-console p { margin-bottom: 0; color: var(--muted); font-size: 14px; }

.terminal-service { padding: 124px 0; background: var(--silver-light); }
.terminal-grid { display: grid; grid-template-columns: minmax(0,1fr) minmax(360px,.7fr); gap: 72px; align-items: center; }
.terminal-copy { padding: 20px 0; }
.terminal-facts { margin: 38px 0 0; border-top: 1px solid var(--line); }
.terminal-facts div { padding: 12px 0; display: grid; grid-template-columns: 190px 1fr; gap: 20px; border-bottom: 1px solid var(--line); }
.terminal-facts dt { font-weight: 740; }
.terminal-facts dd { color: var(--muted); }
.terminal-image { min-height: 600px; }
.device-band { grid-column: 1 / 3; margin-top: 64px; display: grid; grid-template-columns: repeat(5,1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.device-band article { min-height: 230px; padding: 26px; border-right: 1px solid var(--line); }
.device-band article:last-child { border-right: 0; }
.device-band span { color: var(--red-dark); font-size: 10px; font-weight: 850; }
.device-band h3 { margin: 44px 0 12px; font-family: var(--display); font-size: 21px; line-height: 1.25; }
.device-band p { margin-bottom: 0; color: var(--muted); font-size: 12px; }
.faq { grid-column: 1 / 3; margin-top: 84px; padding-top: 70px; display: grid; grid-template-columns: minmax(280px,.6fr) minmax(0,1.4fr); gap: 80px; border-top: 1px solid var(--line); }
.faq-intro h2 { font-size: clamp(36px,4vw,58px); }
.faq-intro > p:last-child { color: var(--muted); }
.faq-list { border-top: 1px solid var(--line); }
details { border-bottom: 1px solid var(--line); }
summary { position: relative; padding: 22px 44px 22px 0; cursor: pointer; list-style: none; font-weight: 720; }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; position: absolute; right: 5px; top: 16px; color: var(--red-dark); font-size: 27px; font-weight: 400; }
details[open] summary::after { content: "−"; }
details p { padding: 0 42px 22px 0; color: var(--muted); }

.official-disclosure { padding: 124px 0; color: var(--white); background: var(--indigo); }
.disclosure-grid { display: grid; grid-template-columns: minmax(360px,.75fr) minmax(0,1.25fr); gap: 86px; align-items: stretch; }
.disclosure-image { min-height: 720px; }
.disclosure-copy { align-self: center; }
.disclosure-copy .section-id { color: var(--red); }
.disclosure-copy > p { color: var(--silver); }
.disclosure-copy dl { margin: 40px 0 0; border-top: 1px solid var(--light-line); }
.disclosure-copy dl div { padding: 12px 0; display: grid; grid-template-columns: 150px 1fr; gap: 24px; border-bottom: 1px solid var(--light-line); }
.disclosure-copy dt { color: #d9dfe8; font-weight: 740; }
.disclosure-copy dd { color: var(--silver); }

.site-footer { padding: 42px 0; color: var(--silver); background: var(--indigo-deep); font-size: 12px; }
.footer-grid { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 46px; align-items: end; }
.footer-grid strong { color: var(--white); font-family: var(--display); font-size: 22px; }
.footer-grid p { margin: 5px 0 0; }

@media (max-width: 1160px) {
  .site-shell { width: min(1440px, calc(100% - 46px)); }
  .header-main { grid-template-columns: 200px minmax(0,1fr); gap: 20px; }
  .site-nav { gap: 14px; overflow-x: auto; scrollbar-width: none; }
  .site-nav::-webkit-scrollbar { display: none; }
  .hero-layout { gap: 45px; }
  .signal-hero h1 { font-size: clamp(48px,5.8vw,72px); }
  .featured-grid { grid-template-columns: minmax(300px,.74fr) minmax(0,1fr); }
  .featured-note { grid-column: 1 / 3; grid-template-columns: 220px 1fr; align-items: end; }
  .announcement-grid, .disclosure-grid { gap: 52px; }
  .device-band { grid-template-columns: repeat(3,1fr); }
  .device-band article { border-bottom: 1px solid var(--line); }
}

@media (max-width: 900px) {
  html { scroll-padding-top: 106px; }
  .site-shell { width: min(100% - 30px,1440px); }
  .signal-strip-inner { grid-template-columns: 1fr auto; }
  .signal-strip-inner span:last-child { display: none; }
  .header-main { min-height: 76px; display: flex; justify-content: space-between; }
  .brand-logo { width: 40px; height: 40px; }
  .brand-lockup strong { font-size: 20px; }
  .nav-toggle { display: inline-flex; align-items: center; gap: 10px; padding: 10px 0; }
  .nav-toggle i { width: 24px; height: 12px; border-top: 2px solid currentColor; border-bottom: 2px solid currentColor; }
  .js .site-nav { position: absolute; left: 0; right: 0; top: 106px; padding: 18px 15px 22px; display: none; grid-template-columns: repeat(2,1fr); gap: 0; overflow: visible; background: var(--white); border-bottom: 1px solid var(--line); }
  .js .site-nav[data-open="true"] { display: grid; }
  .site-nav a { padding: 12px 16px; border-bottom: 1px solid var(--line); }
  .site-nav a::after { display: none; }
  .hero-layout, .channel-layout, .announcement-grid, .terminal-grid, .disclosure-grid { grid-template-columns: 1fr; }
  .signal-hero { padding-top: 30px; }
  .hero-image { min-height: 420px; }
  .hero-band { grid-template-columns: repeat(2,1fr); }
  .hero-band article:nth-child(2) { border-right: 0; }
  .hero-band article:nth-child(1), .hero-band article:nth-child(2) { border-bottom: 1px solid var(--line); }
  .section-head { grid-template-columns: 1fr; gap: 18px; }
  .channel-image, .announcement-image, .disclosure-image { min-height: 500px; }
  .featured-grid { grid-template-columns: 1fr; }
  .featured-main { min-height: 520px; }
  .featured-note { grid-column: 1; }
  .support-console { grid-template-columns: 1fr; }
  .support-console article { min-height: 250px; border-right: 0; border-bottom: 1px solid var(--line); }
  .support-console article:last-child { border-bottom: 0; }
  .terminal-image { min-height: 460px; }
  .device-band, .faq { grid-column: 1; }
  .faq { grid-template-columns: 1fr; gap: 34px; }
  .footer-grid { grid-template-columns: 1fr; gap: 18px; }
}

@media (max-width: 560px) {
  .signal-strip-inner { min-height: 28px; font-size: 7px; }
  .js .site-nav { grid-template-columns: 1fr; }
  .signal-hero h1 { font-size: clamp(42px,12vw,60px); }
  .hero-frequency { grid-template-columns: 1fr; }
  .hero-frequency div { border-right: 0; border-bottom: 1px solid var(--line); }
  .hero-frequency div:last-child { border-bottom: 0; }
  .hero-image { min-height: 300px; }
  .hero-band { grid-template-columns: 1fr; }
  .hero-band article { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .hero-band article:last-child { border-bottom: 0; }
  .channel-center, .featured-signal, .announcement-system, .support-center, .terminal-service, .official-disclosure { padding: 78px 0; }
  .channel-register article, .announcement-list article { grid-template-columns: 1fr; gap: 10px; }
  .channel-register em, .announcement-list em { text-align: left; }
  .channel-image, .announcement-image, .terminal-image, .disclosure-image { min-height: 340px; }
  .featured-main { min-height: 390px; }
  .featured-note { grid-template-columns: 1fr; }
  .featured-heading dl div, .terminal-facts div, .disclosure-copy dl div { grid-template-columns: 1fr; gap: 4px; }
  .device-band { grid-template-columns: 1fr; }
  .device-band article { min-height: auto; border-right: 0; border-bottom: 1px solid var(--line); }
  .device-band article:last-child { border-bottom: 0; }
  .device-band h3 { margin-top: 30px; }
}

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