:root {
  color-scheme: light;
  --ink: #233253;
  --muted: #626f88;
  --blue: #344f92;
  --line: #d8deec;
  --paper: #f4f5fa;
  --sans: Arial, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --serif: "Noto Serif CJK SC", "Songti SC", SimSun, serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 32px; }
body {
  margin: 0;
  color: var(--ink);
  background: radial-gradient(ellipse at 82% 25%, #e7eaf6 0, transparent 46%),
              radial-gradient(ellipse at 9% 67%, #f0edf7 0, transparent 38%), var(--paper);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  line-height: 1.8;
}
a { color: inherit; text-decoration: none; }
a:hover { color: var(--blue); }
a:focus-visible { outline: 2px solid #5775b8; outline-offset: 7px; }
svg { display: block; }
p, h1, h2, h3, figure { margin: 0; }
main { overflow: clip; }
.wrap { width: min(1240px, calc(100% - 112px)); margin-inline: auto; }
.skip { position: fixed; top: -100px; left: 16px; background: #fff; padding: 12px; z-index: 10; }
.skip:focus { top: 12px; }
.header {
  height: 108px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 13px; }
.brand svg { width: 41px; height: 41px; stroke: var(--blue); fill: none; stroke-width: 1.3; }
.brand > span { font-size: 20px; font-weight: 700; letter-spacing: 3px; line-height: 1.5; }
.brand small { display: block; font-size: 9px; font-weight: 400; letter-spacing: 3.4px; }
.header nav { display: flex; align-items: center; gap: 38px; font-size: 12px; letter-spacing: .5px; }
.header nav > a:first-child { letter-spacing: 2px; }
.nav-login { border-bottom: 1px solid #a6afc5; padding-block: 4px; }
.nav-login span { margin-left: 18px; }
.hero {
  position: relative;
  isolation: isolate;
  display: grid;
  grid-template-columns: .82fr 1.18fr;
  gap: 12px;
  align-items: center;
  min-height: min(830px, calc(100svh - 108px));
  padding-top: 66px;
  padding-bottom: 112px;
}
.hero-copy { position: relative; z-index: 2; padding-top: 15px; }
.eyebrow { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 12px; font-weight: 400; letter-spacing: 2px; }
.signal { display: inline-block; width: 4px; height: 4px; border-radius: 50%; background: #5872aa; box-shadow: 0 0 0 4px #5872aa0d; flex-shrink: 0; }
h1 { margin-block: 30px 28px; font-family: var(--serif); font-size: clamp(60px, 6.1vw, 84px); font-weight: 400; line-height: 1.37; letter-spacing: 2px; }
h1 span { color: #44588d; }
.intro { color: var(--muted); font-size: 14px; line-height: 2.1; letter-spacing: .6px; }
.actions { display: flex; align-items: center; flex-wrap: wrap; gap: 28px; margin-top: 35px; }
.button { display: inline-flex; align-items: center; gap: 34px; padding: 11px 22px; border: 1px solid #445d99; color: #f9faff; background: linear-gradient(115deg, #3e548c, #2c427a); font-size: 12px; letter-spacing: 1px; transition: box-shadow .3s, transform .3s; }
.button:hover { color: #fff; box-shadow: 0 7px 25px #4e65a426; transform: translateY(-2px); }
.text-link { display: inline-flex; align-items: center; gap: 19px; font-size: 12px; letter-spacing: .7px; }
.hero-note { display: flex; align-items: center; gap: 20px; color: var(--muted); font-size: 12px; letter-spacing: 1.5px; margin-top: 48px; }
.hero-note > span { color: #4a5f8f; border-right: 1px solid #bec7dd; padding-right: 20px; }
.optics { position: relative; min-width: 0; padding: 14px 0 0; }
.optics::before { content: ""; position: absolute; z-index: -1; inset: 6% -10% 0; background: radial-gradient(ellipse at 48% 44%, #fafcffb3 0, #bcc8e438 31%, #b8b6d41a 48%, transparent 69%); filter: blur(15px); pointer-events: none; }
.optics::after { content: ""; position: absolute; z-index: -1; inset: 0 -10px -2px; background: linear-gradient(#aeb9d280, #aeb9d280) top left / 25px 1px no-repeat, linear-gradient(#aeb9d280, #aeb9d280) top left / 1px 25px no-repeat, linear-gradient(#aeb9d280, #aeb9d280) bottom right / 25px 1px no-repeat, linear-gradient(#aeb9d280, #aeb9d280) bottom right / 1px 25px no-repeat; pointer-events: none; }
.figure-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-inline: 10px; color: var(--muted); font-size: 9px; letter-spacing: 2.2px; }
.figure-index { font-family: Georgia, serif; font-size: 12px; letter-spacing: 3px; }
.ray-diagram { width: 100%; height: auto; overflow: visible; }
.orbit-lines { stroke: #929fc0; stroke-width: .7; opacity: .3; }
.orbit-lines circle:nth-child(2) { stroke-dasharray: 2 10; opacity: .8; }
.orbit-lines ellipse { opacity: .55; }
.diagram-marks { fill: none; stroke: #8999bc; stroke-width: .9; opacity: .75; }
.rays { stroke-opacity: .9; }
.rays path { stroke-dasharray: 1100; animation: ray-reveal 1.8s cubic-bezier(.2, .5, .3, 1) .2s both; }
.lenses { filter: drop-shadow(0 4px 10px #7287b926); }
.focus-halo { opacity: .9; }
.image-plane { stroke: #8294b5; stroke-width: .8; }
.inverted-image { font-family: Georgia, serif; font-size: 11px; letter-spacing: 2.5px; fill: #2c4383; animation: image-form 1.4s ease-out 1.7s both; }
.diagram-labels { font-family: Georgia, serif; font-size: 12px; letter-spacing: 1.5px; fill: #596a8f; }
.diagram-labels .diagram-caption { font-family: var(--sans); font-size: 9px; letter-spacing: 5px; fill: #647392; }
/* 潜影与透镜显影：仅在脚本可用且未要求减少动效时启用；否则直接显示完整静态光路。 */
.latent, .loupe { display: none; }
.latent { fill: none; stroke: #7486b0; }
.latent-rays { stroke-width: 1; stroke-dasharray: 1.2 5.5; stroke-opacity: .5; }
.latent-lenses { stroke-width: .8; stroke-opacity: .45; }
.latent-plane { stroke-width: .7; stroke-opacity: .35; }
.latent-focus { fill: #7486b0; stroke: none; opacity: .55; }
.loupe { fill: none; stroke: #7d8fba; stroke-width: .8; pointer-events: none; }
.loupe circle { stroke-opacity: .55; }
.loupe path { stroke-opacity: .7; }
@media (scripting: enabled) and (prefers-reduced-motion: no-preference) {
  .latent, .loupe { display: inline; }
  .developed { mask: url(#lens-mask); }
  .ray-diagram { touch-action: pan-y; cursor: crosshair; }
}
.optics figcaption { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 10px; color: var(--muted); font-size: 12px; letter-spacing: .6px; }
.lambda { font-family: Georgia, serif; font-size: 13px; letter-spacing: 1.5px; color: #4a5f8f; }
.lambda sub { font-size: 9px; letter-spacing: 0; }
.lens-hint { display: none; font-size: 11px; letter-spacing: 2px; transition: opacity 1.2s; }
.hint-touch { display: none; }
@media (scripting: enabled) and (prefers-reduced-motion: no-preference) {
  .lens-hint { display: inline; }
}
@media (hover: none) {
  .hint-hover { display: none; }
  .hint-touch { display: inline; }
}
.lens-used .lens-hint { opacity: 0; }
.scroll-cue { position: absolute; bottom: 32px; left: 0; display: flex; align-items: center; gap: 17px; color: var(--muted); font-size: 12px; letter-spacing: 2px; }
.scroll-cue > span { display: inline-flex; width: 24px; height: 42px; align-items: center; justify-content: center; border: 1px solid #bfc9df; border-radius: 16px; color: #5c70a0; font-size: 14px; }
.product-section { position: relative; padding-block: 76px 85px; background: linear-gradient(115deg, #f9faff99, #eeeff855); }
.product-section::before { content: ""; position: absolute; top: 0; left: max(56px, calc((100% - 1240px) / 2)); right: max(56px, calc((100% - 1240px) / 2)); height: 1px; background: linear-gradient(90deg, #b9c4dc, #ccd2e080, #b9c4dc); }
.product-layout { display: grid; grid-template-columns: .95fr 1.05fr; align-items: center; gap: 100px; }
.product-name { position: relative; padding-bottom: 8px; }
.product-layout h2 { margin-top: 28px; color: #3f507d; font-family: Georgia, serif; font-size: clamp(75px, 7.7vw, 110px); font-weight: 400; line-height: 1.2; letter-spacing: 6px; }
.product-type { display: block; margin-top: 13px; font-family: var(--sans); font-size: 13px; color: var(--muted); letter-spacing: 6px; }
.product-aside { margin-top: 25px; color: var(--muted); font-family: var(--serif); font-size: 15px; letter-spacing: 2px; }
.status { display: inline-flex; align-items: center; gap: 10px; color: var(--muted); font-size: 12px; letter-spacing: 1px; }
.product-copy h3 { margin-block: 19px 20px; font-family: var(--serif); font-size: 32px; font-weight: 400; letter-spacing: 2px; line-height: 1.65; }
.product-copy > p { color: var(--muted); font-size: 13px; line-height: 2.1; }
.product-copy .text-link { margin-top: 28px; color: #3e5486; border-bottom: 1px solid #b5c0d7; padding-bottom: 4px; }
.footer { display: flex; justify-content: space-between; gap: 24px; padding-block: 30px 35px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.footer strong { color: #42516f; font-size: 12px; font-weight: 400; }
.footer p { margin-top: 5px; font-size: 11px; letter-spacing: .2px; }
.footer .footnote { margin-top: 2px; opacity: .8; }
.footer-links { display: flex; align-items: flex-end; gap: 28px; }
@keyframes ray-reveal { from { stroke-dashoffset: 1100; } to { stroke-dashoffset: 0; } }
@keyframes image-form { from { opacity: 0; } }
@media (max-width: 1100px) {
  .wrap { width: calc(100% - 80px); }
  .hero { grid-template-columns: .85fr 1.15fr; padding-top: 62px; padding-bottom: 104px; min-height: 660px; }
  h1 { font-size: clamp(52px, 6.2vw, 68px); }
  .hero-note { margin-top: 36px; }
  .product-layout { gap: 65px; }
  .product-section::before { left: 40px; right: 40px; }
}
@media (max-width: 700px) {
  .wrap { width: calc(100% - 44px); }
  .header { height: 87px; }
  .brand { gap: 10px; }
  .brand svg { width: 33px; height: 33px; }
  .brand > span { font-size: 17px; letter-spacing: 2px; }
  .brand small { font-size: 8px; letter-spacing: 2.3px; }
  .header nav { gap: 20px; font-size: 12px; }
  .header nav > a:first-child { letter-spacing: .5px; }
  .nav-login span { margin-left: 7px; }
  .hero { grid-template-columns: 1fr; gap: 30px; min-height: 0; padding-block: 44px 94px; }
  .hero-copy { padding-top: 0; }
  .eyebrow { font-size: 12px; letter-spacing: 1.7px; }
  h1 { margin-block: 25px 24px; font-size: clamp(52px, 13vw, 68px); line-height: 1.35; }
  .intro { font-size: 13px; }
  .actions { gap: 25px; margin-top: 29px; }
  .button { padding-inline: 18px; gap: 22px; }
  .hero-note { margin-top: 29px; }
  .optics { width: calc(100% + 20px); margin-left: -10px; }
  .optics::after { inset-inline: 0; }
  .optics::before { inset-inline: -15px; }
  .figure-top { font-size: 8px; letter-spacing: 1.5px; padding-inline: 12px; }
  .optics figcaption { font-size: 12px; letter-spacing: 0; padding-inline: 12px; gap: 5px; }
  .scroll-cue { bottom: 23px; font-size: 12px; }
  .scroll-cue > span { height: 34px; width: 22px; }
  .product-section { padding-block: 43px 47px; }
  .product-section::before { left: 22px; right: 22px; }
  .product-layout { grid-template-columns: 1fr; gap: 37px; }
  .product-layout h2 { font-size: 78px; margin-top: 23px; letter-spacing: 5px; }
  .product-type { font-size: 12px; letter-spacing: 4px; margin-top: 9px; }
  .product-aside { margin-top: 19px; font-size: 14px; }
  .product-copy h3 { font-size: 29px; }
  .product-copy > p { font-size: 13px; }
  .footer { flex-direction: column; gap: 18px; padding-block: 25px 30px; }
  .footer-links { flex-wrap: wrap; gap: 24px; }
}
@media (max-width: 360px) {
  .header nav { gap: 12px; }
  .nav-login span { display: none; }
  .brand svg { width: 29px; height: 29px; }
  .brand > span { font-size: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .rays path { stroke-dashoffset: 0; }
}
@media print {
  body { background: #fff; }
  .header nav, .actions, .scroll-cue { display: none; }
  .wrap { width: 100%; }
  .hero { min-height: 0; padding-block: 25px; }
  .optics::before { display: none; }
  .rays path { animation: none; stroke-dashoffset: 0; }
  .latent, .loupe, .lens-hint { display: none !important; }
  .developed { mask: none !important; }
  .product-section { padding-block: 25px; }
  .footer { padding-block: 20px; }
}