:root {
  color-scheme: light;
  --night: #e9f4fa;
  --text: #223c52;
  --muted: #536e80;
  --cyan: #2584a3;
  --border: #6d9bb43d;
  font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  background: var(--night);
  color: var(--text);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 280px;
  min-height: 100vh;
  min-height: 100svh;
  background-color: var(--night);
  background-image: linear-gradient(180deg, #edf8ff38 0%, #edf8ff20 55%, #edf8ff55 100%), url('/cyber-city.webp?v=20261104-5');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
}
a { color: inherit; }
a:focus-visible { outline: 3px solid var(--cyan); outline-offset: 6px; }
img { display: block; max-width: 100%; }
.page-shell { max-width: 1440px; margin: 0 auto; padding: 0 48px; }
.site-header { height: 99px; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: flex; align-items: center; gap: 13px; font-size: 17px; font-weight: 750; letter-spacing: 2px; text-shadow: 0 1px 8px #ffffffcc; }
.brand-caption { display: block; margin-top: 4px; color: #4c6a80; font-size: 8px; font-weight: 500; letter-spacing: 3.2px; }
.header-note { display: flex; align-items: center; gap: 18px; color: #355b73; font-size: 9px; letter-spacing: 1.8px; text-shadow: 0 1px 8px #ffffffcc; }
.header-mark { color: var(--cyan); font-size: 22px; }
.hero { position: relative; min-height: 450px; overflow: hidden; border: 1px solid #ffffffb3; border-radius: 10px; background: #eef7fc; isolation: isolate; box-shadow: 0 20px 65px #284f6c26; }
.hero-art { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center top; }
.hero-shade { position: absolute; inset: 0; background: linear-gradient(90deg, #f4faffed 0%, #f4faffcf 26%, #f4faff45 51%, #f4faff00 72%); }
.hero-copy { position: relative; z-index: 1; padding: 64px 52px 45px; }
.eyebrow { display: flex; align-items: center; gap: 11px; margin: 0 0 29px; color: #42708b; font-size: 9px; font-weight: 600; letter-spacing: 3px; }
.eyebrow > span { display: block; width: 22px; height: 2px; background: var(--cyan); box-shadow: 0 0 13px #79e7f160; }
h1 { margin: 0; font-size: clamp(44px, 4.8vw, 69px); font-weight: 700; line-height: 1.08; letter-spacing: -3.3px; }
h1 > span { color: var(--cyan); }
.hero-description { margin: 25px 0 0; color: #506c80; font-size: 14px; line-height: 1.7; letter-spacing: .2px; }
.hero-signature { display: flex; align-items: center; gap: 12px; margin-top: 45px; color: #5c7f96; font-size: 8px; letter-spacing: 2.4px; }
.hero-signature > span { display: block; height: 1px; width: 42px; background: #96b0c861; }
.hero-corner { position: absolute; bottom: 23px; right: 23px; width: 22px; height: 22px; border-right: 1px solid #467c9a70; border-bottom: 1px solid #467c9a70; }
.tools-section { padding-top: 29px; scroll-margin-top: 24px; }
.section-heading { display: flex; align-items: center; justify-content: space-between; gap: 18px; margin-bottom: 15px; }
h2 { margin: 0; font-size: 15px; font-weight: 600; letter-spacing: .3px; text-shadow: 0 1px 8px #ffffffdd; }
h2 span { color: #788fac; margin-left: 9px; font-weight: 400; }
.section-heading p { margin: 0; color: #365d73; font-size: 11px; text-shadow: 0 1px 8px #ffffffdd; }
.tool-card { position: relative; display: flex; align-items: center; gap: 21px; padding: 22px 27px; border: 1px solid #ffffffbd; border-radius: 10px; background: linear-gradient(110deg, #f8fcfff5, #eff8fcf0); text-decoration: none; box-shadow: 0 8px 28px #284f6c20; transition: border-color .18s ease, background .18s ease, transform .18s ease; }
.tool-card::before { content: ""; position: absolute; left: -1px; top: 30px; bottom: 30px; width: 2px; background: var(--cyan); opacity: .7; }
.tool-card:hover { border-color: #2584a380; background: linear-gradient(110deg, #ffffff, #edf8ff); transform: translateY(-2px); }
.tool-icon { flex: 0 0 67px; height: 67px; display: grid; place-items: center; border: 1px solid #79e7f13d; border-radius: 7px; background: linear-gradient(140deg, #44bfdc26, #397bba0a); color: var(--cyan); }
.tool-copy { flex: 1; min-width: 0; }
.tool-category { display: block; color: #54798d; font-size: 8px; letter-spacing: 1.9px; }
h3 { margin: 5px 0 3px; font-size: 24px; font-weight: 650; line-height: 1.2; letter-spacing: -.5px; }
.tool-chinese { margin-left: 10px; font-size: 12px; font-weight: 400; color: #5a7589; letter-spacing: 2px; vertical-align: middle; }
.tool-copy p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.7; }
.open-tool { display: inline-flex; align-items: center; justify-content: center; gap: 32px; flex-shrink: 0; padding: 14px 20px; color: #ffffff; background: #286f8e; border: 1px solid #286f8e; border-radius: 5px; font-size: 12px; font-weight: 650; letter-spacing: .3px; transition: background .18s ease, box-shadow .18s ease; }
.open-tool > span { font-size: 19px; line-height: 1; }
.tool-card:hover .open-tool { background: #205e7a; box-shadow: 0 4px 16px #286f8e24; }
.site-footer { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 27px 0 25px; color: #2d5268; font-size: 11px; line-height: 1.8; letter-spacing: .5px; text-shadow: 0 1px 6px #ffffff, 0 0 12px #ffffff; }
.footer-separator { color: #475770; margin: 0 9px; }
.site-footer a { text-decoration: none; }
.site-footer a:hover { color: var(--cyan); text-decoration: underline; }
.skip-link { position: fixed; top: -90px; left: 16px; z-index: 10; padding: 12px 18px; border-radius: 4px; background: #286f8e; color: #ffffff; }
.skip-link:focus { top: 16px; }
@media (min-width: 1600px) { .site-header { height: 112px; } .hero { min-height: 490px; } .hero-copy { padding-top: 80px; } }
@media (max-width: 1000px) {
  .page-shell { padding: 0 30px; }
  .site-header { height: 88px; }
  .hero { min-height: 410px; }
  .hero-copy { padding: 54px 35px 38px; }
  h1 { font-size: 51px; letter-spacing: -2.4px; }
  .hero-signature { margin-top: 39px; }
}
@media (max-width: 700px) {
  body { background-attachment: scroll; background-position: center top; }
  .page-shell { padding: 0 20px; }
  .site-header { height: 83px; }
  .brand { gap: 11px; font-size: 15px; letter-spacing: 1.6px; }
  .brand img { width: 35px; height: 35px; }
  .brand-caption { font-size: 7px; letter-spacing: 2.5px; }
  .header-note { font-size: 0; gap: 0; }
  .header-mark { font-size: 24px; }
  .hero { min-height: 0; border-radius: 6px; }
  .hero-art { position: relative; width: 100%; height: auto; aspect-ratio: 1672 / 941; object-fit: cover; object-position: center; }
  .hero-shade { background: linear-gradient(0deg, #f2f9fd 0%, #f2f9fd 39%, #f2f9fd00 68%); }
  .hero-copy { padding: 8px 25px 29px; margin-top: -15px; }
  .eyebrow { font-size: 8px; letter-spacing: 2.4px; margin-bottom: 18px; }
  h1 { font-size: clamp(34px, 8.8vw, 52px); line-height: 1.09; letter-spacing: -1.7px; }
  .hero-description { font-size: 12px; margin-top: 17px; line-height: 1.75; }
  .hero-signature { display: none; }
  .hero-corner { bottom: 18px; right: 18px; width: 14px; height: 14px; opacity: .5; }
  .tools-section { padding-top: 24px; }
  .section-heading { margin-bottom: 13px; }
  h2 { font-size: 14px; }
  .section-heading p { font-size: 10px; }
  .tool-card { display: grid; grid-template-columns: 57px 1fr; gap: 18px; padding: 21px; border-radius: 6px; }
  .tool-icon { width: 57px; height: 57px; }
  .tool-icon svg { width: 39px; height: 39px; }
  .tool-category { font-size: 7px; letter-spacing: 1.6px; }
  h3 { font-size: 23px; }
  .tool-chinese { font-size: 11px; margin-left: 8px; }
  .tool-copy p { font-size: 11px; }
  .open-tool { grid-column: 1 / -1; justify-content: space-between; padding: 13px 17px; font-size: 12px; }
  .tool-card::before { top: 22px; bottom: 22px; }
  .site-footer { flex-direction: column; justify-content: center; gap: 5px; text-align: center; padding: 23px 0; font-size: 10px; }
}
@media (max-width: 350px) {
  .page-shell { padding: 0 14px; }
  .hero-copy { padding-left: 18px; padding-right: 18px; }
  h1 { font-size: 32px; }
  .tool-card { padding: 18px; gap: 15px; }
  .section-heading p { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}