:root {
  color-scheme: dark;
  --bg: #080a10;
  --panel: #10131d;
  --line: #282b3a;
  --ink: #f5f3fb;
  --muted: #b6b9ca;
  --accent: #c7a6ff;
  --accent-ink: #100a1b;
  --mono: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; }
body { margin: 0; background: var(--bg); color: var(--ink); }
a { color: inherit; }
img, svg { vertical-align: middle; }
img { max-width: 100%; }
p, h1, h2, h3, figure, ul { margin: 0; }
button { font: inherit; color: inherit; }
button, summary { cursor: pointer; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
.shell { width: min(100% - 36px, 1200px); margin-inline: auto; }
.muted, .lead { color: var(--muted); line-height: 1.65; }
.lead { max-width: 49ch; font-size: clamp(1rem, 1.8vw, 1.2rem); }
.sr-only, .skip:not(:focus) { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.skip:focus { position: fixed; z-index: 20; top: 10px; left: 10px; padding: 10px; background: var(--ink); color: var(--bg); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: #080a10f0;
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.header-inner { min-height: 67px; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; padding-block: 10px; }
.brand { display: inline-flex; gap: 7px; align-items: center; text-decoration: none; font-weight: 800; letter-spacing: -.05em; font-size: 1.24rem; white-space: nowrap; }
.brand img { margin-right: 3px; }
.brand b { color: var(--accent); }
nav { display: flex; align-items: start; gap: 5px; flex-direction: column; width: 100%; font-size: .92rem; }
nav > a:not(.button), .app-menu summary { display: block; padding: 10px 8px; color: var(--muted); text-decoration: none; }
nav a:hover, nav summary:hover { color: var(--ink); }
.app-menu { position: relative; }
.app-menu summary { list-style: none; }
.app-menu summary::-webkit-details-marker { display: none; }
.app-menu summary::after { content: "⌄"; margin-left: 8px; }
.app-menu > div { display: grid; gap: 3px; padding: 6px; min-width: 162px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); }
.app-menu a { padding: 8px; border-radius: 5px; text-decoration: none; white-space: nowrap; }
.app-menu a:hover { background: #242737; }
.locale { display: inline-block; color: var(--muted); border: 1px solid var(--line); border-radius: 6px; padding: 5px 8px; font: 700 .68rem var(--mono); white-space: nowrap; }
.menu-toggle { display: inline-flex; align-items: center; gap: 10px; padding: 8px 11px; border: 1px solid var(--line); border-radius: 7px; background: var(--panel); }
nav[data-enhanced]:not(.open) { display: none; }

.button { display: inline-flex; min-height: 46px; justify-content: center; align-items: center; gap: 10px; padding: 10px 15px; border: 1px solid transparent; border-radius: 8px; font-size: .9rem; font-weight: 750; line-height: 1.15; text-decoration: none; }
.button svg { flex: 0 0 17px; width: 17px; height: 17px; }
.primary { background: var(--accent); color: var(--accent-ink); }
.primary:hover { filter: brightness(1.12); }
.secondary, .nav-cta { border-color: #3a3d50; background: #161923; }
.secondary:hover, .nav-cta:hover { background: #212537; border-color: #676981; }
.nav-cta { min-height: 38px; padding: 7px 12px; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 9px; margin-top: 22px; }
.subtle-link { display: inline-flex; align-items: center; gap: 8px; margin-top: 12px; color: var(--muted); font-size: .87rem; text-underline-offset: 3px; }
.subtle-link svg { width: 15px; }

.hero { display: grid; gap: 28px; align-items: center; padding-block: 42px 24px; }
.eyebrow { display: flex; align-items: center; gap: 8px; color: var(--muted); font: 650 .68rem/1.6 var(--mono); letter-spacing: .11em; text-transform: uppercase; }
.eyebrow > span:not(.signal) { color: var(--accent); }
.signal { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 15px #c7a6ff80; }
h1, h2, h3 { letter-spacing: -.055em; line-height: 1.05; }
h1 { margin-block: 13px 15px; font-size: clamp(2.65rem, 9vw, 5.7rem); font-weight: 800; }
h1 em { display: block; color: var(--accent); font-style: normal; }
h2 { margin-top: 8px; font-size: clamp(2rem, 5.5vw, 3.85rem); }
.hero-art, .product-art {
  position: relative;
  isolation: isolate;
  min-width: 0;
  aspect-ratio: 1.2;
  overflow: hidden;
  border: 1px solid #3a3351;
  border-radius: 18px;
  background: radial-gradient(ellipse at 74% 28%, #352459 0%, transparent 66%),
    radial-gradient(circle, #a591ce39 1px, transparent 1.5px) 0 0 / 18px 18px, #151223;
}
.hero-art::before, .hero-art::after { content: ""; position: absolute; z-index: -1; width: 74%; aspect-ratio: 1; left: 18%; top: -2%; border-radius: 50%; border: 1px solid #b893ff38; }
.hero-art::after { width: 63%; left: 24%; top: 5%; border-style: dashed; }
.art-top { position: absolute; inset: 5% 5% auto; display: flex; align-items: center; justify-content: space-between; color: #ded2f9; font: 700 clamp(.55rem, 1.25vw, .72rem) var(--mono); letter-spacing: .1em; }
.art-top span + span { font-size: 1.4rem; line-height: 1; }
.hero-player { position: absolute; width: 32%; top: 12%; right: 14%; transform: rotate(12deg); }
.phone { padding: 4px; border: 1px solid #5b526d; border-radius: 17px; background: #080a10; box-shadow: 9px 15px 32px #0009; }
.phone img { display: block; width: 100%; height: auto; border-radius: 13px; }
.hero-led { position: absolute; z-index: 1; width: 62%; top: 45%; left: 6%; transform: rotate(-10deg); }
.led-device { aspect-ratio: 2.25; display: flex; padding: 6px; border: 1px solid #5b5467; border-radius: 12px; background: #161521; box-shadow: 4px 7px 0 #282337, 8px 15px 24px #0008; }
.led-screen {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  overflow: hidden;
  border: 1px solid #353642;
  border-radius: 7px;
  background: radial-gradient(circle, #2d3622 1px, transparent 1.35px) 0 0 / 6px 6px, #0b0d10;
  color: #c3ff55;
  font: 900 clamp(.95rem, 3.8vw, 2.65rem)/1.1 var(--mono);
  letter-spacing: -.065em;
  text-align: center;
  text-shadow: 0 0 14px #c3ff5575;
}
.led-word { padding: 8px; }
.led-frame { position: absolute; max-width: 93%; opacity: 0; }
.led-frame:first-child { opacity: 1; }
.animated .led-frame { animation: marquee 9s linear infinite; }
.animated .led-frame:nth-child(2) { animation-delay: 3s; }
.animated .led-frame:nth-child(3) { animation-delay: 6s; }
.paused .led-frame { animation-play-state: paused; }
@keyframes marquee {
  0% { opacity: 1; transform: translateX(17%); }
  33% { opacity: 1; transform: translateX(-17%); }
  33.3%, 100% { opacity: 0; transform: translateX(-17%); }
}
.motion { display: block; margin: 12px 0 0 auto; border: 1px solid #5b536d; border-radius: 5px; padding: 5px 8px; background: #181524; color: #eee6ff; font-size: .66rem; }
.art-label { position: absolute; display: flex; gap: 5px; align-items: center; bottom: 5%; padding: 5px 7px; border: 1px solid #534767; border-radius: 4px; background: #171322; font: 700 clamp(.48rem, 1.1vw, .65rem) var(--mono); letter-spacing: .05em; }
.art-label i { width: 5px; height: 5px; border-radius: 50%; background: #c3ff55; }
.label-led { left: 5%; }
.label-play { right: 5%; }
.label-play i { background: #65f7a0; }

.trust { display: grid; grid-template-columns: 1fr 1fr; padding: 0; list-style: none; border: 1px solid var(--line); border-radius: 12px; background: #10121a; }
.trust li { display: flex; gap: 8px; align-items: center; padding: 11px 10px; color: #dddcec; font-size: .76rem; font-weight: 650; }
.trust li svg { flex: 0 0 16px; color: var(--accent); }
.section, .collection { padding-block: 45px; }
.section-title { display: flex; align-items: end; justify-content: space-between; gap: 14px; margin-bottom: 17px; }
.section-count, .visual-label { color: var(--muted); font: 650 .64rem/1.45 var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.theme-led { --accent: #c3ff55; --accent-ink: #131e07; --tint: #242d17; }
.theme-play { --accent: #65f7a0; --accent-ink: #062116; --tint: #15362c; }
.showcase, .panel { border: 1px solid var(--line); border-radius: 15px; padding: 16px; background: var(--panel); }
.showcase + .showcase { margin-top: 18px; }
.showcase-top { display: grid; gap: 18px; }
.identity { display: flex; align-items: center; gap: 10px; }
.identity img { border-radius: 10px; object-fit: contain; background: #090b11; }
.identity strong, .identity span { display: block; }
.identity strong { font-size: 1.01rem; }
.identity span { margin-top: 3px; color: var(--muted); font: 500 .66rem var(--mono); }
.showcase h3 { margin: 13px 0 8px; font-size: clamp(1.9rem, 5.2vw, 3.15rem); }
.showcase-copy > p { max-width: 49ch; color: var(--muted); line-height: 1.6; }
.showcase-visual, .product-art, .scene-preview {
  border: 1px solid #383a4b;
  border-radius: 12px;
  background: radial-gradient(ellipse at 80% 0, var(--tint), transparent 72%),
    radial-gradient(circle, #d7d0ff24 1px, transparent 1.25px) 0 0 / 17px 17px, #10111b;
}
.showcase-visual { display: grid; align-content: space-between; justify-items: center; min-height: 210px; padding: 14px 10px; gap: 14px; }
.showcase-visual .visual-label { justify-self: start; }
.showcase-visual .led-demo { width: min(79%, 325px); }
.demo-choices { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.demo-choices button { border: 1px solid #43485b; border-radius: 6px; background: #181c28; padding: 6px 9px; font-size: .74rem; }
.demo-choices button:hover, .demo-choices button[aria-pressed="true"] { border-color: var(--accent); color: var(--accent); }
.player-demo { position: relative; width: min(94%, 325px); height: 145px; }
.player-demo .phone { position: absolute; width: 36%; max-width: 125px; left: 13%; top: 0; transform: rotate(-8deg); }
.showcase-visual .player-demo { overflow: hidden; }
.eq-card { border: 1px solid #486152; border-radius: 9px; background: #101912; padding: 9px; min-width: 100px; color: #bbddca; font: 600 .65rem var(--mono); box-shadow: 0 8px 23px #0006; }
.player-demo .eq-card { position: absolute; width: 44%; top: 19%; right: 6%; }
.eq-card > span { display: flex; justify-content: space-between; gap: 6px; }
.eq-card b { color: var(--accent); }
.eq-bars { display: flex; align-items: end; gap: 6px; height: 42px; margin-block: 6px; border-bottom: 1px solid #55705e; }
.eq-bars i { flex: 1; height: var(--level); background: var(--accent); border-radius: 3px 3px 0 0; transition: height .2s ease; }
.eq-card small { display: flex; justify-content: space-between; font-size: .55rem; }
.tiles { display: grid; gap: 8px; margin-top: 16px; }
.tile { min-width: 0; padding: 12px; border: 1px solid var(--line); border-radius: 10px; background: #11141e; }
.tile-number { color: var(--accent); font: 650 .65rem var(--mono); }
.tile h3, .showcase .tile h3 { margin: 5px 0; font-size: 1rem; letter-spacing: -.027em; }
.tile p { color: var(--muted); font-size: .83rem; line-height: 1.55; }
.about, .contact { border-top: 1px solid var(--line); }
.contact-grid { display: grid; gap: 8px; margin-top: 17px; }
.contact-grid .tile > svg { color: var(--accent); }
.contact-grid .tile a { text-underline-offset: 3px; font-size: .88rem; overflow-wrap: anywhere; }
.contact-grid .tile a svg { width: 15px; }
.text-button { display: block; margin-top: 9px; padding: 0; background: transparent; border: 0; color: var(--accent); text-decoration: underline; font-size: .8rem; }

.product-hero { padding-block: 36px 10px; }
.product-hero h1 { font-size: clamp(2.7rem, 8vw, 5.15rem); }
.product-art { display: grid; align-items: center; justify-items: center; aspect-ratio: 1.36; }
.product-art .visual-label { position: absolute; top: 5%; left: 5%; }
.product-led .led-demo { width: 72%; transform: rotate(-7deg); }
.product-play .player-demo { width: min(83%, 360px); height: 73%; }
.product-play .phone { max-width: none; }
.product-play .eq-card { top: 37%; }
.badges { display: flex; flex-wrap: wrap; gap: 6px; padding: 0; margin-top: 12px; list-style: none; }
.badges li { padding: 5px 8px; border: 1px solid var(--line); border-radius: 5px; color: var(--muted); font-size: .75rem; }
.scene-panel { display: grid; gap: 18px; }
.scene-panel .muted { margin-block: 8px 12px; }
.scene-preview { display: grid; align-items: center; padding: 15px; }
.scene-preview .eq-card { box-shadow: none; }
.screenshots { display: grid; grid-template-columns: repeat(5, minmax(145px, 1fr)); gap: 10px; overflow: auto; margin-top: 17px; padding-bottom: 10px; scroll-snap-type: x proximity; }
.screenshots figure { min-width: 0; scroll-snap-align: start; }
.shot { display: grid; place-items: center; aspect-ratio: .55; border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: #131520; }
.shot img { display: block; max-height: 100%; object-fit: contain; }
.screenshots figcaption { padding-top: 7px; color: var(--muted); font-size: .78rem; line-height: 1.45; }
.faq { display: grid; gap: 16px; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { padding-block: 12px; color: var(--ink); font-weight: 650; line-height: 1.4; }
.faq details p { padding-bottom: 10px; color: var(--muted); line-height: 1.65; }
.download-panel { display: flex; justify-content: space-between; gap: 20px; padding: clamp(15px, 4vw, 35px); }
.download-qr { display: none; }
.policy-link { margin-block: 15px 34px; color: var(--muted); font-size: .83rem; text-underline-offset: 3px; }
.sticky-download { display: flex; position: fixed; z-index: 9; inset: auto 0 0; align-items: center; justify-content: space-between; gap: 9px; padding: 9px 14px max(9px, env(safe-area-inset-bottom)); border-top: 1px solid var(--line); background: #11141cf5; }
.sticky-download strong, .sticky-download span { display: block; font-size: .84rem; }
.sticky-download span { color: var(--muted); font-size: .69rem; }
body:has(.sticky-download) .site-footer { padding-bottom: 85px; }

.legal { max-width: 760px; padding-block: 35px 50px; }
.legal .eyebrow { margin-top: 20px; }
.legal h1 { font-size: clamp(2.5rem, 7vw, 4.5rem); }
.legal section { margin-top: 24px; }
.legal h2 { margin-bottom: 7px; font-size: 1.32rem; }
.legal section p, .legal section a { color: var(--muted); line-height: 1.7; }
.legal section a { display: inline-block; margin-top: 8px; }
.site-footer { padding-block: 24px; border-top: 1px solid var(--line); background: #0d0f17; }
.footer-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.footer-grid > div { display: grid; gap: 7px; align-content: start; justify-items: start; min-width: 0; }
.footer-grid a:not(.brand), .footer-grid p, .footer-grid span:not(.locale), .fine-print { color: var(--muted); font-size: .76rem; line-height: 1.4; overflow-wrap: anywhere; }
.footer-grid a:not(.brand) { text-decoration: none; }
.footer-grid a:not(.brand):hover { text-decoration: underline; }
.fine-print { padding-top: 14px; margin-top: 16px; border-top: 1px solid var(--line); }

@media (min-width: 460px) {
  .tiles, .contact-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .trust li { font-size: .88rem; padding: 12px 14px; }
}
@media (min-width: 720px) {
  .shell { width: min(100% - 64px, 1200px); }
  nav, nav[data-enhanced]:not(.open) { display: flex; flex-direction: row; align-items: center; width: auto; gap: 12px; }
  .menu-toggle { display: none; }
  .app-menu > div { position: absolute; top: 100%; left: 0; }
  .hero { grid-template-columns: minmax(0, 1.04fr) minmax(0, 1fr); padding-block: 52px 34px; gap: 30px; }
  h1 { font-size: clamp(2.9rem, 6vw, 5.7rem); }
  .trust { grid-template-columns: repeat(4, 1fr); }
  .trust li { justify-content: center; padding-block: 15px; }
  .trust li + li { border-left: 1px solid var(--line); }
  .section, .collection { padding-block: 55px; }
  .showcase, .panel { padding: 22px; }
  .showcase-top { grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: center; }
  .theme-play.showcase .showcase-visual { grid-area: 1 / 1; }
  .theme-play.showcase .showcase-copy { grid-area: 1 / 2; }
  .feature-tiles { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .theme-play .feature-tiles, .principle-tiles, .tool-tiles { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .contact-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .product-hero h1 { font-size: clamp(2.7rem, 5.7vw, 5.15rem); }
  .scene-panel, .faq { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: center; }
  .scene-preview { min-height: 148px; padding: 20px; }
  .download-qr { display: grid; align-content: center; justify-items: center; text-align: center; gap: 6px; flex-shrink: 0; color: var(--muted); font-size: .74rem; }
  .download-qr img { border-radius: 6px; }
  .sticky-download { display: none; }
  body:has(.sticky-download) .site-footer { padding-bottom: 24px; }
  .footer-grid { grid-template-columns: 1.2fr .75fr 1.2fr 1fr; }
}
@media (min-width: 1050px) {
  .hero { gap: 50px; }
  .hero-art { aspect-ratio: 1.24; }
  .showcase { padding: 26px; }
  .showcase-top { gap: 28px; }
  .showcase-visual { min-height: 240px; }
  .tile { padding: 15px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .animated .led-frame { animation: none; }
  .motion { display: none; }
  .eq-bars i { transition: none; }
}

.language-menu summary { white-space: nowrap; }
.language-menu a[aria-current="page"] { color: var(--accent); background: #242737; }
@media (min-width: 720px) {
  .language-menu > div { right: 0; left: auto; }
}
:lang(zh-CN) h1, :lang(zh-CN) h2, :lang(zh-CN) h3 { letter-spacing: -.025em; }
:lang(zh-CN) .led-screen { letter-spacing: .02em; }