:root { color-scheme: dark; --ink: #ecf2f5; --muted: #9aa9b9; --line: #ffffff16; --paper: #080d14; --mint: #9af4cd; }
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 90px; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif; -webkit-font-smoothing: antialiased; }
button { font: inherit; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
figure, h1, h2, p { margin: 0; }
button, a { -webkit-tap-highlight-color: transparent; }
::selection { color: #080d14; background: var(--mint); }
:focus-visible { outline: 2px solid var(--mint); outline-offset: 5px; }
.wrap { width: min(1240px, calc(100% - 96px)); margin-inline: auto; }
.skip-link { position: absolute; z-index: 50; top: -100px; left: 20px; padding: 12px 18px; background: var(--mint); color: #080d14; }
.skip-link:focus { top: 15px; }
.site-header { position: relative; z-index: 10; background: #080d14; border-bottom: 1px solid var(--line); }
.header-inner { height: 80px; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.wordmark { display: inline-flex; align-items: center; gap: 12px; font-size: 20px; font-weight: 750; line-height: 1; white-space: nowrap; }
.wordmark small { display: block; margin-top: 8px; font-size: 8px; letter-spacing: 3px; color: #a0b3c0; font-weight: 600; }
.wordmark-symbol { width: 35px; height: 35px; display: flex; align-items: center; gap: 4px; transform: skew(-16deg); }
.wordmark-symbol span { display: block; width: 7px; background: #d9e9ec; }
.wordmark-symbol span:nth-child(1) { height: 23px; }
.wordmark-symbol span:nth-child(2) { height: 33px; background: var(--mint); }
.wordmark-symbol span:nth-child(3) { height: 18px; background: #89b6ff; }
.main-nav { display: flex; align-items: center; gap: 38px; margin-left: auto; font-size: 13px; font-weight: 550; }
.main-nav > a:hover { color: var(--mint); }
.main-nav .nav-contact { display: inline-flex; align-items: center; gap: 26px; padding: 12px 18px; border: 1px solid #ffffff35; border-radius: 6px; }
.main-nav .nav-contact:hover { border-color: var(--mint); background: #9af4cd08; }
.menu-toggle { display: none; }
.eyebrow { font-size: 11px; line-height: 1.5; font-weight: 600; letter-spacing: 2px; text-transform: uppercase; color: var(--mint); }
.hero { position: relative; isolation: isolate; overflow: hidden; background: radial-gradient(ellipse at 79% 43%, #11303866, transparent 48%), #080d14; }
.hero::before { content: ""; position: absolute; z-index: -1; inset: 0; opacity: .3; background-image: linear-gradient(#8caab712 1px, transparent 1px), linear-gradient(90deg, #8caab712 1px, transparent 1px); background-size: 64px 64px; mask-image: linear-gradient(90deg, transparent, #000); }
.hero-content { min-height: 650px; display: grid; grid-template-columns: 1.12fr 1fr; gap: 12px; align-items: center; position: relative; padding-top: 32px; padding-bottom: 110px; }
.hero-copy { position: relative; z-index: 2; }
.hero-eyebrow { display: flex; align-items: center; gap: 10px; font-family: "Segoe UI", sans-serif; font-size: 10px; letter-spacing: 2.5px; }
.signal-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--mint); box-shadow: 0 0 16px #9af4cd66; }
.hero h1 { margin: 26px 0 14px; font-size: 25px; line-height: 1.3; font-weight: 550; letter-spacing: 3px; }
.hero-headline { font-size: clamp(38px, 4.05vw, 57px); line-height: 1.3; font-weight: 750; letter-spacing: -2px; }
.hero-headline span { color: var(--mint); }
.hero-lead { margin-top: 24px; max-width: 560px; color: #a3b1bf; font-size: 15px; line-height: 1.95; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 28px; margin-top: 32px; }
.button { min-height: 50px; display: inline-flex; align-items: center; justify-content: space-between; gap: 34px; width: fit-content; padding: 0 21px; border: 1px solid transparent; border-radius: 6px; font-size: 13px; font-weight: 650; transition: transform .2s ease, background .2s ease, box-shadow .2s ease; }
.button:hover { transform: translateY(-2px); box-shadow: 0 8px 32px #9af4cd18; }
.button-light, .button-accent { color: #0b211b; background: var(--mint); }
.button-light:hover, .button-accent:hover { background: #c3ffe3; }
.button-dark { color: var(--ink); background: #ffffff06; border-color: #ffffff36; }
.button-dark:hover { border-color: var(--mint); background: #9af4cd0c; }
.text-link { display: inline-flex; gap: 20px; align-items: center; min-height: 44px; font-size: 13px; font-weight: 550; color: #cbd5db; }
.text-link:hover { color: var(--mint); }
.hero-bottom { position: absolute; left: 0; right: 0; bottom: 28px; display: flex; align-items: center; justify-content: space-between; gap: 20px; padding-top: 22px; border-top: 1px solid var(--line); color: #9aa9b9; font-size: 11px; letter-spacing: .5px; }
.hero-product-links { display: flex; gap: 32px; flex-wrap: wrap; }
.hero-product-links a, .hero-scroll { padding-block: 8px; }
.hero-product-links a:hover, .hero-scroll:hover { color: var(--mint); }
.hero-scroll { white-space: nowrap; }
.product-universe { position: relative; width: 100%; aspect-ratio: 540 / 480; }
.universe-label { position: absolute; top: 0; right: 0; font-size: 8px; color: #8b9eaa; letter-spacing: 2px; font-family: Consolas, monospace; }
.universe-label span { margin-left: 14px; letter-spacing: 1px; }
.universe-lines { position: absolute; inset: 0; width: 100%; height: 100%; }
.orbit-rings { transform-origin: 270px 240px; animation: orbit-turn 70s linear infinite; }
.universe-core { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); display: flex; flex-direction: column; align-items: center; }
.core-symbol { position: relative; font-family: "Segoe UI", sans-serif; font-size: 90px; line-height: 1.1; font-weight: 250; letter-spacing: -12px; color: #ceffee; text-shadow: 0 0 35px #9af4cd44; }
.core-symbol span { display: inline-block; font-size: 45px; margin-left: 3px; vertical-align: top; }
.universe-core > span:nth-child(2) { font-size: 11px; letter-spacing: 5px; margin-top: 10px; color: #d2f4eb; }
.universe-core small { margin-top: 10px; font-size: 7px; letter-spacing: 2px; color: #7faaa8; }
.universe-node { position: absolute; display: flex; align-items: center; gap: 10px; width: 160px; min-height: 69px; padding: 12px; border: 1px solid #b6e9dc2b; border-radius: 9px; background: linear-gradient(120deg, #172c32f5, #0c161ff5); box-shadow: 0 12px 28px #0004; transition: border-color .2s, transform .2s; font-size: 12px; font-weight: 600; }
.universe-node:hover { transform: translateY(-4px); border-color: var(--mint); }
.universe-node img { width: 27px; height: 27px; object-fit: contain; }
.universe-node small { display: block; margin-bottom: 5px; color: #91a8b6; font-size: 8px; font-weight: 400; letter-spacing: .8px; }
.universe-node b { margin-left: auto; align-self: start; color: #83b9ae; font-size: 12px; font-weight: 400; }
.node-learning { top: 16%; left: 0; }
.node-ai { top: 15%; right: 0; border-color: #9af4cd55; }
.node-pay { bottom: 23%; left: -2%; }
.node-cert { bottom: 23%; right: -2%; }
.node-keepy { bottom: 0; left: 50%; transform: translateX(-50%); }
.node-keepy:hover { transform: translate(-50%, -4px); }
.node-ai-icon { width: 27px; text-align: center; font-size: 31px; color: var(--mint); }
@keyframes orbit-turn { to { transform: rotate(360deg); } }
.product-index { padding: 90px 0 72px; background: #0b111a; border-block: 1px solid var(--line); }
.index-heading { display: grid; grid-template-columns: 160px 1fr 320px; gap: 32px; align-items: end; margin-bottom: 48px; }
.index-heading .eyebrow { align-self: start; margin-top: 8px; }
.index-heading h2 { font-size: 35px; line-height: 1.45; font-weight: 650; letter-spacing: -1px; }
.index-heading > p:last-child { color: var(--muted); font-size: 13px; line-height: 1.95; }
.product-rail { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; }
.product-rail a { position: relative; display: grid; grid-template-rows: auto 1fr; grid-template-columns: 1fr auto; gap: 26px 6px; min-height: 120px; padding: 20px; border: 1px solid #ffffff18; border-radius: 8px; background: #ffffff02; font-weight: 600; font-size: 16px; transition: border-color .2s, background .2s; }
.product-rail a:hover { background: #9af4cd08; border-color: #9af4cd70; }
.product-rail a span:first-child { grid-column: 1 / 3; color: #8da2b4; font-size: 10px; font-weight: 400; letter-spacing: 1px; }
.product-rail a span:last-child { color: var(--mint); font-size: 18px; font-weight: 400; align-self: end; }
.product-section { overflow: hidden; padding: 104px 0; border-bottom: 1px solid var(--line); position: relative; --accent: #9af4cd; }
.product-layout { display: grid; grid-template-columns: minmax(0, .86fr) minmax(0, 1.14fr); gap: 8%; align-items: center; }
.reverse-layout { grid-template-columns: minmax(0, 1.14fr) minmax(0, .86fr); }
.reverse-layout .product-copy { order: 2; }
.reverse-layout .product-figure { order: 1; }
.product-copy { min-width: 0; }
.product-meta { display: flex; align-items: center; gap: 14px; margin-bottom: 32px; font-size: 10px; font-weight: 500; letter-spacing: 1px; }
.product-type { color: var(--accent); }
.product-type::before { content: ""; display: inline-block; width: 5px; height: 5px; margin: 0 9px 2px 0; background: var(--accent); }
.product-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; font-size: 16px; font-weight: 650; }
.product-brand img { width: 35px; height: 35px; object-fit: contain; }
.product-copy h2 { font-size: 45px; line-height: 1.4; font-weight: 650; letter-spacing: -1px; }
.product-lead { max-width: 470px; margin-top: 20px; font-size: 14px; line-height: 1.95; color: var(--muted); }
.feature-list { max-width: 490px; margin: 27px 0 30px; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.feature-list li { display: grid; grid-template-columns: 112px 1fr; gap: 12px; padding: 13px 0; border-bottom: 1px solid var(--line); font-size: 12px; line-height: 1.7; }
.feature-list strong { font-weight: 550; color: #dae4eb; }
.feature-list span { color: var(--muted); }
.product-figure { min-width: 0; position: relative; padding: 22px; border: 1px solid #ffffff15; border-radius: 12px; background: linear-gradient(145deg, #ffffff08, #ffffff01); }
.product-figure::before { content: ""; position: absolute; pointer-events: none; inset: 15% 8%; background: var(--accent); opacity: .075; filter: blur(55px); }
.image-frame { position: relative; aspect-ratio: 1.42; overflow: hidden; border: 1px solid #ffffff24; border-radius: 6px; background: #13202a; box-shadow: 0 20px 45px #0005; }
.image-frame img { width: 100%; height: 100%; object-fit: cover; object-position: top left; }
.product-figure figcaption { position: relative; display: flex; justify-content: space-between; gap: 15px; margin-top: 19px; font-size: 9px; font-weight: 400; letter-spacing: .7px; color: #92a5b3; }
.section-wending { background: #080e15; }
.wending-deck { position: relative; aspect-ratio: 1.3; isolation: isolate; }
.wending-card { position: absolute; top: 9%; left: 6%; width: 88%; overflow: hidden; border: 1px solid #ffffff40; border-radius: 9px; background: #f7f9fc; box-shadow: 0 20px 40px #0005; transform: translate(3%, -2%) rotate(5deg) scale(.96); z-index: 1; }
.wending-card.is-front { transform: translate(-2%, 2%) rotate(-3deg); z-index: 2; box-shadow: 0 25px 45px #0006; }
.wending-card img { width: 100%; height: auto; display: block; }
.deck-controls { position: relative; display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.deck-controls[hidden] { display: none; }
.deck-selectors { display: flex; flex-wrap: wrap; gap: 4px; }
.deck-select, .deck-pause { display: inline-flex; align-items: center; justify-content: center; gap: 7px; min-height: 40px; padding: 8px 10px; border: 1px solid transparent; border-radius: 5px; background: transparent; color: var(--muted); cursor: pointer; font-size: 10px; }
.deck-select span { width: 5px; height: 5px; border-radius: 50%; background: currentColor; opacity: .45; }
.deck-select[aria-pressed="true"] { color: var(--mint); background: #9af4cd0a; border-color: #9af4cd35; }
.deck-select[aria-pressed="true"] span { opacity: 1; }
.deck-select:hover, .deck-pause:hover { color: var(--mint); }
.deck-pause { white-space: nowrap; }
.deck-pause:disabled { cursor: default; opacity: .7; }
.section-pay { background: #0b1319; --accent: #b6e996; }
.section-cert { background: #090f19; --accent: #95b6ff; }
.section-keepy { background: #10111c; --accent: #c4b0f3; }
.section-ai { background: radial-gradient(ellipse at 75% 50%, #14392f44, transparent 65%), #080f14; }
.ai-mark { display: grid; place-items: center; width: 35px; height: 35px; border-radius: 6px; color: #092319; background: var(--mint); font-size: 20px; font-weight: 700; }
.keepy-visual { position: relative; min-height: 400px; display: flex; flex-direction: column; justify-content: space-between; gap: 30px; overflow: hidden; padding: 28px; border: 1px solid #c4b0f326; border-radius: 6px; background: radial-gradient(ellipse at top right, #43326255, transparent), #171824; }
.keepy-visual-top { display: flex; align-items: center; justify-content: space-between; gap: 18px; font-size: 10px; font-weight: 500; letter-spacing: 1px; color: #c4b0f3; }
.keepy-visual-top img { width: 48px; height: 48px; }
.saved-items { display: grid; gap: 11px; }
.saved-item { display: flex; gap: 12px; align-items: center; background: #232433; border: 1px solid #ffffff12; padding: 16px 14px; border-radius: 7px; color: #e3e2ef; }
.saved-item:nth-child(2) { margin-left: 14px; }
.saved-item:nth-child(3) { margin-right: 14px; }
.saved-item strong { font-size: 13px; font-weight: 550; }
.saved-item small { display: block; margin-top: 6px; font-size: 9px; color: #a5a4b6; }
.saved-icon { flex: 0 0 34px; height: 34px; display: grid; place-items: center; border-radius: 6px; font-size: 17px; }
.saved-link { background: #29403e; color: #a2dfcc; }
.saved-text { background: #393149; color: #c4b0f3; }
.saved-task { background: #403b2f; color: #e6cda2; }
.saved-type { margin-left: auto; font-size: 9px; color: #aaa5bf; white-space: nowrap; }
.keepy-visual-bottom { display: flex; gap: 8px; flex-wrap: wrap; }
.keepy-visual-bottom span { padding: 6px 10px; border: 1px solid #c4b0f32b; border-radius: 4px; color: #b4a6ce; font-size: 10px; }
.about-section { padding: 100px 0; background: #0b111a; }
.about-layout { display: grid; grid-template-columns: .9fr 1.1fr; gap: 12%; }
.about-layout h2 { margin-top: 20px; font-size: 41px; line-height: 1.45; font-weight: 650; letter-spacing: -1px; }
.about-copy { padding-top: 26px; font-size: 14px; line-height: 2; color: var(--muted); }
.about-copy p + p { margin-top: 22px; }
.partnership-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin-top: 55px; }
.partnership-list > a { border: 1px solid var(--line); border-radius: 8px; padding: 28px; background: #ffffff02; transition: border-color .2s; }
.partnership-list > a:hover { border-color: #9af4cd70; }
.partnership-list > a > span:first-child { font-size: 18px; font-weight: 600; }
.partnership-list p { font-size: 13px; line-height: 1.85; color: var(--muted); margin: 14px 0 24px; }
.partnership-action { font-size: 11px; color: var(--mint); }
.contact-section { padding: 90px 0 84px; position: relative; background: radial-gradient(ellipse at 85% 100%, #15473555, transparent 65%), #0b161a; border-block: 1px solid #9af4cd22; }
.contact-layout { display: grid; grid-template-columns: 1fr auto; gap: 50px; align-items: end; }
.contact-section h2 { margin: 20px 0 20px; font-size: 43px; line-height: 1.4; font-weight: 650; letter-spacing: -1px; }
.contact-section p:last-child { color: var(--muted); font-size: 13px; line-height: 1.8; }
.contact-actions { display: flex; flex-direction: column; align-items: flex-start; gap: 15px; padding-bottom: 6px; }
.contact-email { display: flex; align-items: center; gap: 35px; padding-bottom: 13px; border-bottom: 1px solid #9af4cd70; font-size: 23px; font-weight: 500; color: var(--mint); white-space: nowrap; }
.contact-email:hover { color: #d0ffea; }
.copy-email { min-height: 44px; border: 0; background: transparent; color: #c5d5d8; font-size: 12px; padding: 4px 0; cursor: pointer; }
.copy-email:hover { color: var(--mint); }
.copy-status { min-height: 16px; font-size: 11px; color: var(--mint); }
.site-footer { color: #8193a2; background: #080d14; }
.footer-inner { min-height: 120px; display: flex; align-items: center; justify-content: space-between; gap: 30px; font-size: 10px; }
.footer-inner div { display: flex; flex-direction: column; gap: 9px; }
.footer-inner strong { color: #dae4eb; font-size: 16px; font-weight: 550; }
.footer-inner a:hover { color: var(--mint); }
.footer-filing { border-top: 1px solid var(--line); padding-block: 16px 22px; text-align: center; font-size: 12px; line-height: 1.8; }
.footer-filing a { display: inline-block; padding-block: 6px; }
.footer-filing a:hover { color: var(--mint); }
@media (max-width: 1100px) {
  .wrap { width: calc(100% - 64px); }
  .hero-content { min-height: 630px; grid-template-columns: 1.1fr 1fr; }
  .hero-headline { font-size: 42px; }
  .hero-lead { font-size: 13px; }
  .universe-node { width: 139px; padding: 10px; gap: 7px; font-size: 11px; }
  .universe-node img, .node-ai-icon { width: 23px; height: 23px; }
  .core-symbol { font-size: 70px; }
  .index-heading { grid-template-columns: 120px 1fr 270px; gap: 24px; }
  .index-heading h2 { font-size: 30px; }
  .product-layout, .reverse-layout { gap: 5%; }
  .product-copy h2 { font-size: 38px; }
  .product-rail a { padding: 16px; font-size: 14px; }
  .product-figure { padding: 15px; }
  .saved-type { display: none; }
  .contact-email { font-size: 20px; gap: 20px; }
}
@media (min-width: 761px) and (max-width: 960px) {
  .hero-content { min-height: 610px; }
  .hero-headline { font-size: 35px; }
  .hero h1 { font-size: 22px; }
  .hero-lead br { display: none; }
  .hero-actions { gap: 18px; }
  .hero-actions .button { padding-inline: 14px; gap: 16px; }
  .universe-node { width: 123px; min-height: 61px; font-size: 10px; gap: 6px; }
  .universe-node b { display: none; }
  .universe-label { letter-spacing: 1px; font-size: 7px; }
  .universe-label span { display: none; }
  .core-symbol { font-size: 58px; }
  .core-symbol span { font-size: 30px; }
  .universe-core > span:nth-child(2) { font-size: 8px; letter-spacing: 3px; }
  .universe-core small { font-size: 6px; letter-spacing: 1px; }
  .hero-product-links { gap: 22px; }
  .index-heading { grid-template-columns: 1fr 2fr; }
  .index-heading > p:last-child { grid-column: 2; }
  .product-rail { gap: 8px; }
  .product-rail a { padding: 14px 10px; font-size: 12px; }
  .product-layout, .reverse-layout { grid-template-columns: 1fr; gap: 40px; }
  .product-copy { max-width: 600px; }
  .product-figure { width: 85%; justify-self: end; }
  .reverse-layout .product-copy, .reverse-layout .product-figure { order: 0; }
  .product-lead, .feature-list { max-width: none; }
  .about-layout { gap: 7%; }
  .about-layout h2 { font-size: 34px; }
  .partnership-list > a { padding: 20px; }
  .contact-layout { grid-template-columns: 1fr; gap: 35px; }
}
@media (max-width: 760px) {
  html { scroll-padding-top: 24px; }
  .wrap { width: calc(100% - 40px); }
  .header-inner { height: 66px; }
  .wordmark { font-size: 16px; }
  .wordmark-symbol { width: 28px; height: 30px; gap: 3px; }
  .wordmark-symbol span { width: 6px; }
  .wordmark-symbol span:nth-child(1) { height: 20px; }
  .wordmark-symbol span:nth-child(2) { height: 29px; }
  .wordmark-symbol span:nth-child(3) { height: 17px; }
  .menu-toggle { display: grid; place-items: center; width: 40px; height: 40px; padding: 0; border: 1px solid #ffffff30; border-radius: 5px; color: var(--ink); background: #ffffff05; font-size: 19px; cursor: pointer; }
  .main-nav { display: flex; position: absolute; left: 0; right: 0; top: 66px; padding: 14px 20px 22px; flex-direction: column; align-items: stretch; gap: 0; background: #101923; border-top: 1px solid var(--line); box-shadow: 0 18px 25px #0005; }
  .js .main-nav { display: none; }
  .js .main-nav.is-open { display: flex; }
  html:not(.js) .site-header { margin-bottom: 205px; }
  html:not(.js) .menu-toggle { display: none; }
  .main-nav a { padding: 13px 0; font-size: 14px; }
  .main-nav .nav-contact { justify-content: space-between; margin-top: 8px; padding: 13px 14px; }
  .hero-content { min-height: 0; display: flex; flex-direction: column; align-items: stretch; padding-top: 46px; padding-bottom: 0; gap: 0; }
  .hero-eyebrow { font-size: 8px; letter-spacing: 2px; }
  .hero h1 { font-size: 20px; margin: 23px 0 14px; letter-spacing: 2px; }
  .hero-headline { font-size: clamp(31px, 7.6vw, 48px); letter-spacing: -1px; line-height: 1.4; }
  .hero-lead { font-size: 13px; margin-top: 21px; max-width: 420px; line-height: 1.9; }
  .hero-lead br { display: none; }
  .hero-actions { gap: 24px; margin-top: 26px; }
  .hero-actions .button { min-height: 48px; gap: 20px; padding-inline: 17px; font-size: 12px; }
  .product-universe { max-width: 420px; width: 100%; margin: 36px auto 28px; }
  .universe-label { font-size: 7px; letter-spacing: 1px; }
  .universe-node { width: 132px; min-height: 60px; font-size: 10px; gap: 7px; padding: 10px; }
  .universe-node small { font-size: 7px; }
  .universe-node img { width: 23px; height: 23px; }
  .core-symbol { font-size: 63px; }
  .core-symbol span { font-size: 33px; }
  .universe-core > span:nth-child(2) { font-size: 8px; letter-spacing: 3px; }
  .universe-core small { font-size: 6px; letter-spacing: 1px; }
  .node-pay { left: 0; }
  .node-cert { right: 0; }
  .hero-bottom { position: relative; bottom: auto; padding-block: 18px; }
  .hero-scroll { display: none; }
  .hero-product-links { width: 100%; gap: 4px 19px; font-size: 10px; }
  .product-index { padding: 60px 0; }
  .index-heading { display: block; margin-bottom: 30px; }
  .index-heading .eyebrow { margin: 0 0 18px; }
  .index-heading h2 { font-size: 30px; }
  .index-heading > p:last-child { margin-top: 18px; font-size: 13px; max-width: 470px; }
  .product-rail { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .product-rail a { min-height: 100px; padding: 16px; font-size: 14px; gap: 20px 6px; }
  .product-rail a:last-child { grid-column: 1 / -1; }
  .product-section { padding: 65px 0; }
  .product-layout, .reverse-layout { display: flex; flex-direction: column; align-items: stretch; gap: 35px; }
  .reverse-layout .product-copy, .reverse-layout .product-figure { order: 0; }
  .product-meta { margin-bottom: 25px; }
  .product-brand { margin-bottom: 17px; font-size: 15px; }
  .product-copy h2 { font-size: 35px; }
  .product-lead { margin-top: 18px; font-size: 13px; line-height: 1.95; }
  .feature-list { margin: 24px 0 28px; }
  .feature-list li { grid-template-columns: 100px 1fr; gap: 10px; font-size: 11px; }
  .product-figure { width: 100%; padding: 13px; }
  .image-frame { aspect-ratio: 1.2; }
  .wending-card { border-radius: 6px; }
  .deck-controls { gap: 3px; }
  .deck-select, .deck-pause { font-size: 9px; padding-inline: 7px; min-height: 44px; }
  .product-figure figcaption { font-size: 8px; gap: 8px; letter-spacing: 0; margin-top: 14px; }
  .keepy-visual { padding: 18px; min-height: 365px; gap: 25px; }
  .keepy-visual-top img { width: 40px; height: 40px; }
  .keepy-visual-top { font-size: 8px; }
  .saved-item { gap: 9px; padding: 13px 9px; }
  .saved-item strong { font-size: 11px; }
  .saved-item small { font-size: 8px; }
  .keepy-visual-bottom span { font-size: 9px; padding: 5px 7px; }
  .about-section { padding: 65px 0; }
  .about-layout { display: block; }
  .about-layout h2 { font-size: 32px; }
  .about-copy { padding-top: 25px; font-size: 13px; }
  .partnership-list { grid-template-columns: 1fr; gap: 12px; margin-top: 30px; }
  .partnership-list > a { padding: 23px; }
  .partnership-list p { margin-bottom: 17px; }
  .contact-section { padding: 65px 0; }
  .contact-layout { display: block; }
  .contact-section h2 { font-size: 32px; }
  .contact-section p:last-child { font-size: 12px; }
  .contact-actions { margin-top: 34px; }
  .contact-email { gap: 20px; font-size: 20px; white-space: normal; overflow-wrap: anywhere; }
  .footer-inner { padding: 28px 0; min-height: 0; flex-wrap: wrap; gap: 22px; }
  .footer-inner div { width: 100%; }
}
@media (max-width: 360px) {
  .hero-headline { font-size: 29px; }
  .hero-actions { gap: 16px; }
  .hero-actions .button { gap: 12px; padding-inline: 13px; }
  .universe-node { width: 117px; padding: 9px; gap: 6px; }
  .universe-node b { display: none; }
  .core-symbol { font-size: 51px; }
  .product-copy h2 { font-size: 32px; }
  .product-rail a { font-size: 13px; padding: 14px; }
  .saved-item:nth-child(2), .saved-item:nth-child(3) { margin: 0; }
  .keepy-visual { padding: 12px; }
}
.theme-toggle { flex-shrink: 0; display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 0 13px; color: var(--ink); background: #ffffff08; border: 1px solid #ffffff30; border-radius: 6px; cursor: pointer; font-size: 12px; }
.theme-toggle[hidden] { display: none; }
.theme-toggle:hover { border-color: var(--mint); }
.theme-icon { width: 17px; height: 17px; }
.icon-light { display: none; }
[data-theme="light"] .icon-light { display: block; }
[data-theme="light"] .icon-dark { display: none; }
@media (max-width: 760px) {
  .header-inner { gap: 12px; }
  .theme-toggle { margin-left: auto; min-height: 40px; padding-inline: 10px; font-size: 11px; gap: 6px; }
  .menu-toggle { flex-shrink: 0; }
}

/* 白月光: pearl surfaces, deep teal accents, and cool silver light. */
:root[data-theme="light"] { color-scheme: light; --ink: #172b3c; --muted: #536578; --line: #233c571f; --paper: #f7f9fc; --mint: #116f69; }
[data-theme="light"] ::selection { color: #fff; background: #116f69; }
[data-theme="light"] .skip-link { color: #fff; }
[data-theme="light"] .site-header { background: #f7f9fc; }
[data-theme="light"] .wordmark small { color: #52667a; }
[data-theme="light"] .wordmark-symbol span { background: #24485a; }
[data-theme="light"] .wordmark-symbol span:nth-child(2) { background: #17877b; }
[data-theme="light"] .wordmark-symbol span:nth-child(3) { background: #7799d8; }
[data-theme="light"] .main-nav .nav-contact { border-color: #24485a30; }
[data-theme="light"] .main-nav .nav-contact:hover { border-color: var(--mint); background: #116f6908; }
[data-theme="light"] .theme-toggle,
[data-theme="light"] .menu-toggle { color: var(--ink); border-color: #24485a30; background: #fff; }
[data-theme="light"] .theme-toggle:hover { border-color: var(--mint); }
[data-theme="light"] .hero { background: radial-gradient(ellipse at 79% 43%, #daeeebaa, transparent 50%), #f7f9fc; }
[data-theme="light"] .hero::before { opacity: .6; background-image: linear-gradient(#335f7110 1px, transparent 1px), linear-gradient(90deg, #335f7110 1px, transparent 1px); }
[data-theme="light"] .hero-aurora { background: radial-gradient(ellipse at 70% 40%, #a3d9d444, transparent 42%), radial-gradient(ellipse at 35% 80%, #bfc9f033, transparent 40%); }
[data-theme="light"] .signal-dot { box-shadow: 0 0 16px #116f692b; }
[data-theme="light"] .hero-lead,
[data-theme="light"] .hero-bottom { color: var(--muted); }
[data-theme="light"] .button-light,
[data-theme="light"] .button-accent { color: #fff; background: #116f69; }
[data-theme="light"] .button-light:hover,
[data-theme="light"] .button-accent:hover { background: #095951; }
[data-theme="light"] .button:hover { box-shadow: 0 8px 28px #116f6920; }
[data-theme="light"] .button-dark { color: var(--ink); background: #ffffff80; border-color: #24485a45; }
[data-theme="light"] .button-dark:hover { background: #e7f3ef; border-color: var(--mint); }
[data-theme="light"] .text-link { color: #365466; }
[data-theme="light"] .text-link:hover { color: var(--mint); }
[data-theme="light"] .universe-label { color: #526b7e; }
[data-theme="light"] #core-glow stop:first-child { stop-color: #529c94; stop-opacity: .16; }
[data-theme="light"] #core-glow stop:last-child { stop-color: #529c94; }
[data-theme="light"] #orbit-stroke stop:first-child { stop-color: #3a8a80; }
[data-theme="light"] #orbit-stroke stop:nth-child(2) { stop-color: #58879e; stop-opacity: .3; }
[data-theme="light"] #orbit-stroke stop:last-child { stop-color: #7f89c4; }
[data-theme="light"] .connection-lines { stroke: #306a76; stroke-opacity: .26; }
[data-theme="light"] .orbit-points { fill: #237d72; }
[data-theme="light"] .core-waves { stroke: #3b9486; }
[data-theme="light"] .core-symbol { color: #226e69; text-shadow: 0 0 35px #3a8a8026; }
[data-theme="light"] .universe-core > span:nth-child(2) { color: #285858; }
[data-theme="light"] .universe-core small { color: #53756f; }
[data-theme="light"] .universe-node { background: linear-gradient(120deg, #fffffffa, #edf5f6fa); border-color: #507e8038; box-shadow: 0 12px 28px #24485a10; }
[data-theme="light"] .universe-node:hover { border-color: var(--mint); }
[data-theme="light"] .universe-node small { color: #516b7a; }
[data-theme="light"] .universe-node b { color: #3d786e; }
[data-theme="light"] .node-ai { border-color: #28827466; }
[data-theme="light"] .orbit-trail { stroke: #168674; filter: drop-shadow(0 0 4px #16867466); }
[data-theme="light"] .trail-cross { stroke: #3f7fb3; }
[data-theme="light"] .trail-reverse { stroke: #8274b7; }
[data-theme="light"] .product-index,
[data-theme="light"] .about-section { background: #fff; }
[data-theme="light"] .product-rail a,
[data-theme="light"] .partnership-list > a { border-color: var(--line); background: #f7f9fc; }
[data-theme="light"] .product-rail a:hover,
[data-theme="light"] .partnership-list > a:hover { border-color: #116f6980; background: #eff7f4; }
[data-theme="light"] .product-rail a span:first-child { color: #536578; }
[data-theme="light"] .product-section { --accent: #116f69; }
[data-theme="light"] .section-wending { background: #f3f8f7; }
[data-theme="light"] .section-pay { background: #f8faf5; --accent: #49702f; }
[data-theme="light"] .section-cert { background: #f1f5fc; --accent: #3c66a8; }
[data-theme="light"] .section-keepy { background: #f7f5fc; --accent: #7158a0; }
[data-theme="light"] .section-ai { background: radial-gradient(ellipse at 75% 50%, #d6eee766, transparent 65%), #f3f8f7; }
[data-theme="light"] .feature-list strong { color: #263e50; }
[data-theme="light"] .product-figure { border-color: #24485a20; background: linear-gradient(145deg, #ffffffcc, #ffffff50); }
[data-theme="light"] .image-frame { border-color: #24485a26; background: #e6edf3; box-shadow: 0 20px 45px #24485a12; }
[data-theme="light"] .product-figure figcaption { color: #536578; }
[data-theme="light"] .wending-card { border-color: #24485a30; box-shadow: 0 16px 32px #24485a20; }
[data-theme="light"] .wending-card.is-front { box-shadow: 0 22px 38px #24485a2b; }
[data-theme="light"] .deck-select[aria-pressed="true"] { background: #116f6908; border-color: #116f6935; }
[data-theme="light"] .ai-mark { color: #fff; }
[data-theme="light"] .keepy-visual { border-color: #7158a02b; background: radial-gradient(ellipse at top right, #d8cbef55, transparent), #f0ecf8; }
[data-theme="light"] .keepy-visual-top { color: #7158a0; }
[data-theme="light"] .saved-item { color: #3c3454; background: #fff; border-color: #7158a01a; }
[data-theme="light"] .saved-item small,
[data-theme="light"] .saved-type { color: #6b627a; }
[data-theme="light"] .saved-link { color: #326f60; background: #e4f1e9; }
[data-theme="light"] .saved-text { color: #7158a0; background: #eee7fa; }
[data-theme="light"] .saved-task { color: #7b6330; background: #f8f0dd; }
[data-theme="light"] .keepy-visual-bottom span { color: #7158a0; border-color: #7158a040; }
[data-theme="light"] .contact-section { background: radial-gradient(ellipse at 85% 100%, #cce8df88, transparent 65%), #edf5f3; border-color: #116f692b; }
[data-theme="light"] .contact-email { border-color: #116f6970; }
[data-theme="light"] .contact-email:hover { color: #094c49; }
[data-theme="light"] .copy-email { color: #375f61; }
[data-theme="light"] .copy-email:hover { color: var(--mint); }
[data-theme="light"] .site-footer { color: #536578; background: #f7f9fc; }
[data-theme="light"] .footer-inner strong { color: var(--ink); }
[data-theme="light"] .motion-toggle { color: #4c6877; border-color: #24485a30; background: #ffffff50; }
[data-theme="light"] .motion-toggle:hover { color: var(--mint); border-color: #116f6980; }
@media (max-width: 760px) {
  [data-theme="light"] .main-nav { background: #fff; box-shadow: 0 18px 25px #24485a14; }
}
.hero-aurora { position: absolute; z-index: -1; inset: -15%; pointer-events: none; background: radial-gradient(ellipse at 70% 40%, #2a957922, transparent 42%), radial-gradient(ellipse at 35% 80%, #4d64af16, transparent 40%); }
.orbit-trail { stroke: #bcffe7; stroke-width: 2.5; stroke-dasharray: 3 97; filter: drop-shadow(0 0 5px #9af4cd); }
.trail-cross { stroke: #99c8ff; stroke-dasharray: 5 95; stroke-width: 2; }
.trail-reverse { stroke: #b7b0ff; stroke-dasharray: 2 98; stroke-width: 2; }
.core-wave { opacity: 0; transform-origin: 270px 240px; }
.hero-utilities { display: flex; align-items: center; gap: 25px; }
.motion-toggle { color: #a8bcc6; background: transparent; border: 1px solid #ffffff25; border-radius: 5px; padding: 8px 12px; font-size: 10px; cursor: pointer; white-space: nowrap; }
.motion-toggle:hover { color: var(--mint); border-color: #9af4cd70; }
.motion-toggle[hidden] { display: none; }
.button span, .text-link span, .partnership-action { transition: translate .25s ease; }
.button:hover span, .text-link:hover span { translate: 3px -3px; }
.partnership-action { display: inline-block; }
.partnership-list > a:hover .partnership-action { translate: 5px 0; }
.image-frame img { transition: transform .8s cubic-bezier(.2,.7,.2,1); }
.product-figure:hover .image-frame img { transform: scale(1.025); }
@media (prefers-reduced-motion: no-preference) {
  .hero-copy > * { animation: hero-enter .85s cubic-bezier(.16,1,.3,1) both; }
  .hero-copy > :nth-child(2) { animation-delay: .09s; }
  .hero-copy > :nth-child(3) { animation-delay: .18s; }
  .hero-copy > :nth-child(4) { animation-delay: .29s; }
  .hero-copy > :nth-child(5) { animation-delay: .4s; }
  .product-universe { animation: universe-enter 1.3s cubic-bezier(.16,1,.3,1) both; transform: perspective(900px) rotateX(var(--tilt-x, 0deg)) rotateY(var(--tilt-y, 0deg)); transition: transform .6s ease-out; }
  .hero-aurora { animation: aurora-drift 12s ease-in-out infinite alternate; }
  .orbit-rings { animation-duration: 32s; }
  .orbit-trail { animation: orbit-flow 6s linear infinite; }
  .trail-cross { animation-duration: 4s; animation-delay: -2s; }
  .trail-reverse { animation-duration: 7s; animation-direction: reverse; animation-delay: -3s; }
  .core-wave { animation: core-expand 5s ease-out infinite; }
  .wave-delayed { animation-delay: -2.5s; }
  .universe-node { animation: node-float 5s ease-in-out infinite; }
  .node-ai { animation-delay: -.8s; animation-duration: 5.8s; }
  .node-pay { animation-delay: -2.3s; animation-duration: 6s; }
  .node-cert { animation-delay: -3.6s; animation-duration: 5.5s; }
  .node-keepy { animation-delay: -1.5s; animation-duration: 6.5s; }
  .universe-node:hover, .universe-node:focus-visible { animation-play-state: paused; }
  .signal-dot { animation: signal-breathe 3s ease-in-out infinite; }
  .hero-scroll span { display: inline-block; animation: scroll-nudge 2s ease-in-out infinite; }
  .reveal { transition: opacity .7s ease, translate .8s cubic-bezier(.16,1,.3,1); transition-delay: var(--reveal-delay, 0ms); }
  .reveal:not(.is-revealed) { opacity: 0; translate: 0 30px; }
  .reveal:focus-within { opacity: 1; translate: none; transition-delay: 0ms; }
  .hero.is-offscreen *, .hero.is-offscreen::before { animation-play-state: paused; }
  .motion-paused *, .motion-paused *::before, .motion-paused *::after { animation-play-state: paused !important; }
  .motion-paused .hero-copy > *, .motion-paused .product-universe { animation: none; }
  .motion-paused .product-universe { transform: none; transition: none; }
  .motion-paused .reveal { opacity: 1; translate: none; transition: none; }
  .motion-paused .image-frame img, .motion-paused .button, .motion-paused .universe-node { transition: none; }
}
@keyframes hero-enter { from { opacity: 0; translate: 0 24px; } to { opacity: 1; translate: 0 0; } }
@keyframes universe-enter { from { opacity: 0; scale: .92; } to { opacity: 1; scale: 1; } }
@keyframes aurora-drift { from { transform: translate(-3%, 1%) scale(.96); } to { transform: translate(3%, -2%) scale(1.06); } }
@keyframes orbit-flow { to { stroke-dashoffset: -100; } }
@keyframes core-expand { 0% { opacity: 0; transform: scale(.65); } 15% { opacity: .24; } 100% { opacity: 0; transform: scale(2.4); } }
@keyframes node-float { 0%, 100% { translate: 0 0; } 50% { translate: 0 -9px; } }
@keyframes signal-breathe { 0%, 100% { opacity: .6; scale: .9; } 50% { opacity: 1; scale: 1.2; } }
@keyframes scroll-nudge { 0%, 100% { translate: 0 -2px; } 50% { translate: 0 4px; } }
@media (max-width: 760px) {
  .hero-bottom { align-items: flex-start; gap: 12px; }
  .hero-product-links { gap: 3px 15px; }
  .hero-utilities { padding-top: 1px; }
  .motion-toggle { font-size: 9px; padding: 7px 9px; }
  .product-universe { transform: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .product-universe { transform: none; }
  .reveal { opacity: 1; translate: none; }
  .motion-toggle { display: none; }
}