:root {
  --sky: #e8f6ff;
  --sky-strong: #d2edff;
  --panel: #c7e6f8;
  --navy: #0e3d68;
  --blue: #147bd1;
  --muted: #5684a7;
  --line: rgba(14, 61, 104, 0.19);
  --signal: #ef6d5c;
  --max: 1220px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--navy);
  background: var(--sky);
  font-family: "Noto Sans SC", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
  line-height: 1.5;
}
a { color: inherit; text-decoration: none; }
a, button { -webkit-tap-highlight-color: transparent; }

.site-shell {
  position: relative;
  min-height: 100dvh;
  overflow: hidden;
  isolation: isolate;
  --grid-x: 0px;
  --grid-y: 0px;
  --rings-x: 0px;
  --rings-y: 0px;
}
.site-shell::before {
  position: fixed;
  inset: -18px;
  z-index: -2;
  content: "";
  opacity: .74;
  background-image:
    linear-gradient(rgba(20, 123, 209, .08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20, 123, 209, .08) 1px, transparent 1px);
  background-size: 28px 28px;
  transform: translate3d(var(--grid-x), var(--grid-y), 0);
  will-change: transform, background-position;
  animation: grid-drift 28s linear infinite;
}
.site-shell::after {
  position: fixed;
  top: 27vh;
  right: -250px;
  z-index: -1;
  width: 520px;
  height: 520px;
  content: "";
  opacity: .3;
  background: repeating-radial-gradient(circle at center, var(--blue) 0 1px, transparent 1px 18px);
  pointer-events: none;
  transform: translate3d(var(--rings-x), var(--rings-y), 0);
  transition: transform .35s ease-out;
  will-change: transform;
}
@keyframes grid-drift { to { background-position: 28px 28px, 28px 28px; } }

.container { width: min(calc(100% - 48px), var(--max)); margin: 0 auto; }
.eyebrow {
  margin: 0;
  color: var(--blue);
  font: 600 .74rem/1.25 "IBM Plex Mono", Consolas, monospace;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.section-number { margin-right: .65rem; color: var(--signal); }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 88px;
  border-bottom: 1px solid var(--line);
}
.mark {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  color: #fff;
  background: var(--blue);
  font: 600 .88rem/1 "IBM Plex Mono", Consolas, monospace;
  clip-path: polygon(0 0, 76% 0, 100% 24%, 100% 100%, 24% 100%, 0 76%);
}
.main-nav { display: flex; align-items: center; gap: clamp(15px, 3vw, 34px); }
.main-nav a {
  position: relative;
  padding: 10px 0;
  color: var(--muted);
  font: 600 .75rem/1 "IBM Plex Mono", Consolas, monospace;
  letter-spacing: .035em;
  transition: color .2s ease;
}
.main-nav a::after {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  height: 2px;
  content: "";
  background: var(--blue);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .2s ease;
}
.main-nav a:hover, .main-nav a:focus-visible, .main-nav a[aria-current="page"] { color: var(--navy); }
.main-nav a:hover::after, .main-nav a:focus-visible::after, .main-nav a[aria-current="page"]::after { transform: scaleX(1); }
.main-nav a:focus-visible, .route-link:focus-visible, .friend-link:focus-visible { outline: 2px solid var(--blue); outline-offset: 5px; }

.page-main { min-height: calc(100dvh - 146px); }
.home-main { display: grid; grid-template-rows: minmax(470px, 1fr) auto; }
.home-hero {
  display: grid;
  min-height: 570px;
  padding: clamp(54px, 9vh, 112px) 0 clamp(46px, 6vh, 80px);
  place-items: center;
  text-align: center;
}
.home-hero-inner { width: min(100%, 1060px); }
.home-title {
  max-width: 1060px;
  margin: 24px auto 0;
  color: var(--navy);
  font-size: clamp(2.65rem, 5.8vw, 6.3rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: 0;
}
.home-title .accent { color: var(--blue); }
.home-summary {
  max-width: 490px;
  margin: clamp(28px, 4vw, 48px) auto 0;
  color: var(--muted);
  font-size: clamp(1rem, 1.55vw, 1.22rem);
}
.home-actions { display: flex; justify-content: center; gap: 14px; margin-top: clamp(32px, 4vw, 50px); }
.route-link {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  min-height: 46px;
  padding: 0 18px;
  color: #fff;
  background: var(--blue);
  font: 600 .76rem/1 "IBM Plex Mono", Consolas, monospace;
  letter-spacing: .05em;
  transition: background .2s ease, transform .2s ease;
}
.route-link:hover { background: var(--navy); transform: translateY(-2px); }
.route-link svg { width: 17px; height: 17px; }

.about-band { border-top: 1px solid var(--line); }
.about-grid { display: grid; grid-template-columns: minmax(260px, .72fr) minmax(0, 1.28fr); }
.about-title-zone {
  display: grid;
  min-height: 330px;
  padding: clamp(40px, 5vw, 68px) 0;
  border-right: 1px solid var(--line);
  align-content: space-between;
}
.display-heading {
  margin: 12px 0 0;
  color: var(--navy);
  font-size: clamp(3.45rem, 9.5vw, 8.4rem);
  font-weight: 900;
  line-height: .94;
  letter-spacing: 0;
  text-align: center;
}
.about-title-zone .display-heading { padding-right: clamp(20px, 4vw, 58px); text-align: left; }
.about-copy-zone { display: grid; padding: clamp(40px, 5vw, 68px) 0 clamp(40px, 5vw, 68px) clamp(28px, 6vw, 100px); align-content: center; }
.about-copy {
  max-width: 640px;
  margin: 0 0 36px;
  color: var(--navy);
  font-size: clamp(1.28rem, 2vw, 2rem);
  font-weight: 500;
  line-height: 1.48;
}
.data-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); border-top: 1px solid var(--line); }
.data-point { min-height: 104px; padding: 18px 18px 16px 0; border-bottom: 1px solid var(--line); }
.data-point:nth-child(odd) { border-right: 1px solid var(--line); }
.data-point:nth-child(even) { padding-left: 24px; }
.data-key { margin: 0 0 10px; color: var(--muted); font: 600 .67rem/1 "IBM Plex Mono", Consolas, monospace; letter-spacing: .08em; }
.data-value { margin: 0; color: var(--blue); font-size: 1.18rem; font-weight: 700; }

.split-page {
  display: grid;
  grid-template-rows: auto minmax(480px, 1fr);
  gap: clamp(42px, 6vw, 76px);
  padding: clamp(58px, 8vw, 108px) 0 clamp(44px, 6vw, 74px);
}
.page-intro { text-align: center; }
.page-intro .display-heading { margin-top: 13px; }
.page-copy { max-width: 520px; margin: 24px auto 0; color: var(--muted); font-size: clamp(1rem, 1.35vw, 1.15rem); }

.friend-list { display: grid; grid-template-rows: repeat(4, minmax(126px, 1fr)); border-top: 1px solid var(--line); }
.friend-link {
  display: grid;
  grid-template-columns: minmax(80px, .18fr) minmax(220px, 1fr) minmax(220px, .96fr) 50px;
  gap: clamp(16px, 2.4vw, 34px);
  align-items: center;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  transition: background .2s ease, padding .2s ease;
}
.friend-link:hover { padding-right: 18px; padding-left: 18px; background: rgba(255, 255, 255, .38); }
.friend-index { color: var(--signal); font: 600 .73rem/1 "IBM Plex Mono", Consolas, monospace; }
.friend-name { margin: 0; font-size: clamp(1.45rem, 2.5vw, 2.25rem); font-weight: 700; line-height: 1.12; }
.friend-type { display: block; margin-top: 8px; color: var(--blue); font: 600 .66rem/1 "IBM Plex Mono", Consolas, monospace; letter-spacing: .07em; }
.friend-description { margin: 0; color: var(--muted); font-size: clamp(.92rem, 1.2vw, 1.03rem); line-height: 1.7; }
.arrow-box { display: grid; width: 42px; height: 42px; place-items: center; color: var(--blue); border: 1px solid var(--blue); transition: color .2s ease, background .2s ease; }
.friend-link:hover .arrow-box { color: #fff; background: var(--blue); }
.arrow-box svg { width: 19px; height: 19px; }

.update-page { display: grid; min-height: calc(100dvh - 146px); padding: clamp(34px, 5vw, 66px) 0; place-items: center; }
.update-panel {
  display: grid;
  width: 100%;
  min-height: min(72vh, 720px);
  padding: clamp(34px, 6vw, 84px);
  color: #fff;
  background: var(--blue);
  place-items: center;
  text-align: center;
  clip-path: polygon(0 0, 97% 0, 100% 4%, 100% 100%, 3% 100%, 0 96%);
}
.update-panel .eyebrow { color: #d6f1ff; }
.update-panel .section-number { color: #ffd4ca; }
.update-heading { margin: 14px 0 0; color: #fff; font-size: clamp(3.35rem, 10vw, 8.85rem); font-weight: 900; line-height: .94; }
.update-copy { max-width: 540px; margin: 30px auto 0; color: #e5f5ff; font-size: clamp(1rem, 1.45vw, 1.18rem); line-height: 1.85; }
.update-note { margin: 38px 0 0; color: #c8ecff; font: 600 .7rem/1.5 "IBM Plex Mono", Consolas, monospace; letter-spacing: .08em; }

.service-page { display: grid; grid-template-rows: auto minmax(450px, 1fr); gap: clamp(42px, 6vw, 76px); padding: clamp(58px, 8vw, 108px) 0 clamp(44px, 6vw, 74px); }
.service-grid { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(260px, .78fr); gap: clamp(34px, 8vw, 120px); align-items: center; padding: clamp(28px, 4vw, 52px) 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.service-copy { max-width: 720px; }
.service-title { margin: 0; font-size: clamp(1.55rem, 3vw, 3.15rem); font-weight: 700; line-height: 1.28; }
.service-detail { max-width: 500px; margin: 22px 0 0; color: var(--muted); font-size: clamp(.98rem, 1.3vw, 1.1rem); }
.service-tags { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 34px; }
.service-tag { padding: 8px 11px; color: var(--blue); border: 1px solid var(--line); font: 600 .67rem/1 "IBM Plex Mono", Consolas, monospace; letter-spacing: .05em; }
.qr-wrap { justify-self: end; width: min(100%, 350px); }
.qr-label { display: flex; justify-content: space-between; margin-bottom: 11px; color: var(--muted); font: 600 .67rem/1 "IBM Plex Mono", Consolas, monospace; letter-spacing: .06em; }
.qr-slot { position: relative; aspect-ratio: 1; overflow: hidden; background: #fff; border: 1px solid var(--blue); }
.qr-image { display: block; width: 100%; height: 100%; object-fit: contain; }

.site-footer { padding: 0 0 28px; }
.footer-row { display: flex; justify-content: space-between; gap: 18px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--muted); font: 600 .67rem/1.4 "IBM Plex Mono", Consolas, monospace; }
.footer-row p { margin: 0; }
.back-top { color: var(--navy); }

@media (max-width: 680px) {
  .container { width: min(calc(100% - 32px), var(--max)); }
  .topbar { min-height: 72px; }
  .mark { width: 40px; height: 40px; font-size: .77rem; }
  .main-nav { gap: 12px; }
  .main-nav a { padding: 9px 0; font-size: .62rem; }
  .home-main { grid-template-rows: minmax(545px, 1fr) auto; }
  .home-hero { min-height: 545px; padding: 56px 0 44px; }
  .home-title { font-size: clamp(2.3rem, 10.25vw, 3.3rem); }
  .home-summary { max-width: 330px; }
  .about-grid { grid-template-columns: 1fr; }
  .about-title-zone { min-height: 205px; padding: 36px 0 22px; border-right: 0; }
  .about-title-zone .display-heading { padding-right: 0; text-align: center; }
  .about-copy-zone { padding: 32px 0 46px; }
  .display-heading { font-size: clamp(3rem, 14vw, 5.4rem); }
  .about-copy { margin-bottom: 28px; font-size: 1.25rem; }
  .split-page, .service-page { grid-template-rows: auto auto; gap: 40px; padding: 52px 0 38px; }
  .friend-list { grid-template-rows: none; }
  .friend-link { grid-template-columns: 44px minmax(0, 1fr) 38px; min-height: 152px; gap: 14px; }
  .friend-description { grid-column: 2 / 4; margin-top: -2px; }
  .friend-link:hover { padding-right: 8px; padding-left: 8px; }
  .update-page { min-height: calc(100dvh - 132px); padding: 26px 0; }
  .update-panel { min-height: min(68vh, 600px); padding: 32px 24px 42px; }
  .update-heading { font-size: clamp(2.65rem, 12.5vw, 4rem); }
  .service-grid { grid-template-columns: 1fr; padding: 32px 0; }
  .qr-wrap { justify-self: start; width: min(100%, 290px); }
  .footer-row { flex-direction: column; }
}

@media (max-width: 390px) {
  .main-nav { gap: 8px; }
  .main-nav a { font-size: .58rem; }
  .data-grid { grid-template-columns: 1fr; }
  .data-point:nth-child(odd) { border-right: 0; }
  .data-point:nth-child(even) { padding-left: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .site-shell::before { animation: none; }
  .site-shell::before, .site-shell::after { transform: none; transition: none; }
}