@charset "UTF-8";

:root {
  color-scheme: light;
  --bg: #f6f5ef;
  --surface: #f1f1e8;
  --text: #243d34;
  --muted: #72786e;
  --accent: #285440;
  --on-accent: #faf9ef;
  --orange: #bc623e;
  --border: #dcded3;
  --glow: #c5d3b8;
  --card-hover: #edefe4;
  --sans: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --serif: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --mono: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #17231f;
  --surface: #1c2b24;
  --text: #e2e8d8;
  --muted: #a3b0a0;
  --accent: #bbd2a9;
  --on-accent: #203327;
  --orange: #e69b73;
  --border: #35483b;
  --glow: #435e39;
  --card-hover: #203127;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 30px; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
::selection { background: var(--accent); color: var(--on-accent); }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
a, button { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--orange); outline-offset: 6px; }
svg { display: block; }
.site-shell { max-width: 1328px; margin-inline: auto; padding-inline: 64px; }
.skip-link { position: fixed; top: -100px; left: 20px; z-index: 10; background: var(--accent); color: var(--on-accent); padding: 12px 20px; }
.skip-link:focus { top: 12px; }
.site-header { height: 112px; display: flex; align-items: center; border-bottom: 1px solid var(--border); }
.brand { display: flex; align-items: center; gap: 12px; font-size: 20px; font-weight: 650; letter-spacing: 3px; }
.brand-mark { width: 40px; height: 40px; color: var(--accent); }
.brand-domain { display: block; font: 9px/1.8 var(--mono); letter-spacing: 2px; margin-top: 3px; }
.main-nav { margin-left: auto; display: flex; gap: 36px; align-items: center; font-size: 13px; }
.main-nav a { padding-block: 12px; transition: color .2s; }
.main-nav a:hover, .text-link:hover, .site-footer a:hover { color: var(--orange); }
.theme-toggle { display: grid; place-items: center; background: transparent; color: var(--text); border: 1px solid var(--border); border-radius: 50%; width: 36px; height: 36px; margin-left: 30px; cursor: pointer; }
.theme-toggle:hover { background: var(--card-hover); }
.theme-toggle svg { width: 17px; height: 17px; }
.sun-icon, [data-theme="dark"] .moon-icon { display: none; }
[data-theme="dark"] .sun-icon { display: block; }
.hero { display: grid; grid-template-columns: 1.1fr 1fr; align-items: center; gap: 16px; padding-block: 78px 72px; }
.eyebrow { font: 10px/1.6 var(--mono); letter-spacing: 1.6px; margin: 0; }
.hero .eyebrow { display: flex; align-items: center; gap: 10px; }
.small-cross { color: var(--orange); font-size: 21px; line-height: 1; }
h1 { font-family: var(--serif); font-size: clamp(48px, 5.2vw, 70px); font-weight: 500; line-height: 1.42; letter-spacing: 2px; margin: 29px 0 22px; }
.accent-word { position: relative; color: var(--accent); display: inline-block; }
.accent-word svg { position: absolute; width: 100%; height: 13px; bottom: 0; left: 0; overflow: visible; }
.accent-word path { stroke: var(--orange); stroke-width: 2.3; fill: none; stroke-linecap: round; }
.hero-description { color: var(--muted); font-size: 14px; line-height: 2.1; letter-spacing: .5px; margin: 0; }
.hero-actions { display: flex; align-items: center; gap: 26px; margin-top: 34px; font-size: 12px; }
.button-primary { display: inline-flex; align-items: center; gap: 32px; padding: 16px 21px; border: 1px solid var(--accent); background: var(--accent); color: var(--on-accent); border-radius: 3px; transition: transform .2s; }
.button-primary:hover { transform: translateY(-3px); }
.button-primary span { font-size: 18px; line-height: 1; }
.text-link { display: inline-flex; align-items: center; gap: 14px; transition: color .2s; }
.hero-note { color: var(--muted); display: flex; align-items: center; gap: 8px; margin-top: 43px; font-size: 10px; letter-spacing: 1px; }
.status-dot { width: 5px; height: 5px; background: var(--accent); border-radius: 50%; }
.orbit-panel { margin-top: 18px; color: var(--accent); min-width: 0; }
.diagram-heading, .diagram-caption { display: flex; align-items: center; justify-content: space-between; }
.diagram-heading { font: 9px var(--mono); letter-spacing: 1.3px; color: var(--muted); padding-inline: 22px; }
.diagram-heading > :last-child { font-size: 20px; }
.orbit-art { width: 100%; height: auto; }
.diagram-label { font: 9px var(--sans); letter-spacing: 1px; fill: var(--muted); }
.diagram-micro { font: 7px var(--mono); fill: var(--muted); letter-spacing: 1px; }
.diagram-caption { margin-inline: 22px; padding-top: 14px; border-top: 1px solid var(--border); font-size: 10px; letter-spacing: 1.5px; color: var(--muted); }
.diagram-coordinate { font: 9px var(--mono); }
.orbit-system { transform-origin: 250px 235px; animation: orbit-turn 72s linear infinite; }
.orbit-satellite {
  offset-path: path("M 448 235 A 198 78 0 1 1 52 235 A 198 78 0 1 1 448 235 Z");
  offset-anchor: 0px 0px;
  offset-rotate: 0deg;
  animation: orbit-travel 18s linear infinite;
}
.orbit-satellite-primary { animation-delay: -2s; }
.orbit-satellite-secondary { animation-duration: 26s; animation-delay: -15s; animation-direction: reverse; }
.orbit-satellite-tertiary { animation-duration: 34s; animation-delay: -25s; }
.orbit-glow { animation: orbit-breathe 7s ease-in-out infinite; }
.orbit-halo { transform-origin: 0 0; animation: orbit-halo 4s ease-in-out infinite; }
@keyframes orbit-turn { to { transform: rotate(360deg); } }
@keyframes orbit-travel { to { offset-distance: 100%; } }
@keyframes orbit-breathe { 50% { opacity: .55; } }
@keyframes orbit-halo { 50% { transform: scale(1.3); opacity: .15; } }
.explore-section { border-top: 1px solid var(--border); padding-block: 44px 64px; }
.section-heading { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 28px; }
.section-index { color: var(--muted); font-size: 9px; letter-spacing: 1.3px; }
h2 { font-family: var(--serif); font-size: 27px; line-height: 1.5; font-weight: 500; letter-spacing: 1px; margin: 13px 0 0; }
.orange-dot { color: var(--orange); padding-left: 3px; }
.section-aside { font-size: 11px; color: var(--muted); letter-spacing: 1px; margin-bottom: 5px; }
.explore-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.explore-card { border: 1px solid var(--border); border-radius: 4px; padding: 25px 27px 19px; background: var(--surface); transition: background .25s, transform .25s; }
.explore-card:hover { background: var(--card-hover); transform: translateY(-4px); }
.card-top { display: flex; align-items: flex-start; justify-content: space-between; margin-bottom: 22px; }
.card-number { font: 10px var(--mono); color: var(--muted); }
.card-top svg { width: 38px; height: 38px; color: var(--accent); }
.card-category { font: 8px var(--mono); color: var(--muted); letter-spacing: 1.4px; margin: 0 0 10px; }
h3 { font-size: 19px; font-weight: 500; letter-spacing: 1px; margin: 0 0 14px; }
.card-description { font-size: 12px; line-height: 2; color: var(--muted); margin: 0 0 25px; }
.card-bottom { border-top: 1px solid var(--border); padding-top: 15px; display: flex; align-items: center; justify-content: space-between; color: var(--muted); font-size: 9px; letter-spacing: 1px; }
.card-symbol { color: var(--accent); font-size: 17px; line-height: 1; }
.about-section { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); display: grid; grid-template-columns: 1fr 1.85fr; padding: 51px 0 53px; }
.about-decoration { display: block; font: 110px/1 var(--serif); color: var(--accent); opacity: .12; margin: 30px 0 0 15px; }
.about-copy h2 { font-size: 26px; margin: 0 0 23px; }
.about-copy p { font-size: 13px; line-height: 2.1; color: var(--muted); margin: 0 0 17px; }
.closing-note { display: flex; justify-content: center; align-items: center; gap: 16px; padding-block: 37px; }
.closing-note > span:first-child { font-size: 22px; color: var(--orange); }
.closing-note p { font-size: 12px; letter-spacing: 1px; }
.closing-english { color: var(--muted); font: 8px var(--mono); letter-spacing: 1px; margin-left: 18px; }
.site-footer { display: flex; flex-direction: column; gap: 12px; border-top: 1px solid var(--border); padding-block: 24px; color: var(--muted); font-size: 10px; }
.footer-main { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; }
.site-footer p { margin: 0; }
.footer-domain { font-family: var(--mono); }
.footer-filing { align-self: flex-start; font-size: 11px; line-height: 1.8; white-space: nowrap; }
.back-top { margin-left: auto; }

@media (min-width: 1600px) { .hero { padding-block: 90px 88px; } }
@media (max-width: 1050px) {
  .site-shell { padding-inline: 38px; }
  .hero { gap: 0; padding-block: 60px; }
  h1 { font-size: 56px; }
  .hero-actions { gap: 20px; }
  .explore-card { padding-inline: 20px; }
  .card-description { font-size: 11px; }
}
@media (max-width: 760px) {
  .site-shell { padding-inline: 24px; }
  .site-header { height: 88px; }
  .brand { font-size: 18px; gap: 8px; letter-spacing: 2px; }
  .brand-mark { width: 34px; height: 34px; }
  .brand-domain { font-size: 8px; letter-spacing: 1.5px; }
  .main-nav { gap: 20px; font-size: 12px; }
  .theme-toggle { margin-left: 20px; width: 32px; height: 32px; }
  .hero { grid-template-columns: 1fr; padding-block: 50px 36px; }
  h1 { font-size: clamp(48px, 9vw, 68px); margin-top: 23px; }
  .hero-description { font-size: 13px; }
  .hero-actions { margin-top: 28px; }
  .hero-note { margin-top: 28px; }
  .orbit-panel { width: min(100%, 440px); margin: 40px auto 0; }
  .diagram-heading, .diagram-caption { margin-inline: 0; }
  .diagram-heading { padding-inline: 0; }
  .orbit-art { max-height: 360px; }
  .explore-section { padding-block: 32px 40px; }
  h2 { font-size: 24px; }
  .section-aside { display: none; }
  .explore-grid { grid-template-columns: 1fr; gap: 14px; }
  .explore-card { padding: 22px 24px 18px; position: relative; }
  .card-top { margin-bottom: 17px; }
  .card-top svg { position: absolute; top: 25px; right: 24px; width: 44px; height: 44px; }
  .card-description { font-size: 12px; margin-bottom: 20px; }
  .about-section { grid-template-columns: 1fr; padding-block: 32px 35px; }
  .about-decoration { display: none; }
  .about-copy { margin-top: 21px; }
  .about-copy h2 { font-size: 24px; }
  .about-copy p { font-size: 12px; }
  .desktop-break { display: none; }
  .closing-note { flex-wrap: wrap; gap: 10px; padding-block: 26px; }
  .closing-note p { font-size: 11px; }
  .closing-english { display: none; }
  .site-footer { gap: 14px; padding-block: 22px; }
  .footer-main { gap: 12px 16px; }
}
@media (max-width: 380px) {
  .site-shell { padding-inline: 18px; }
  .main-nav { gap: 14px; }
  .theme-toggle { margin-left: 14px; }
  .brand { font-size: 16px; }
  .brand-mark { width: 28px; }
  .hero-actions { gap: 16px; font-size: 11px; }
  .button-primary { padding: 15px 17px; gap: 24px; }
  .diagram-caption { font-size: 9px; letter-spacing: .5px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}