:root {
  --bg: #276aa5;
  --bg-panel: #225d93;
  --bg-panel-2: #1e5486;
  --border: #5986ad;
  --accent: #48c6e6;
  --accent-dark: #a6e8ff;
  --accent-dark-hover: #c7f1ff;
  --on-accent: #102d4a;
  --text: #ffffff;
  --text-muted: #d2e3f2;
  --success: #2f9e6b;
  --warn: #f2b632;
  --error: #e0566e;
  --honey: #f2b632;
  --sakura: #f39ac1;
  --on-dark: #ffffff;
  --on-dark-muted: #c4d8ec;
  --arc-1: #2c629c;
  --arc-2: #3270ad;
  --arc-3: #3a7ebd;
  --cell-deep: #1e4a7b;
  --navy: #0e2340;
  --paper-bar: #194d7d;
  --paper-1: #28689f;
  --paper-2: #205789;
  --glass-top: rgba(255, 255, 255, 0.08);
  --glass-bottom: rgba(255, 255, 255, 0.03);
  --glass-row: rgba(255, 255, 255, 0.06);
  --line-dark: rgba(255, 255, 255, 0.14);
  --line-strong: rgba(255, 255, 255, 0.55);
  --hi-line: rgba(255, 255, 255, 0.22);
  --fact-bg: rgba(16, 44, 80, 0.42);
  --veil-bg: rgba(14, 35, 64, 0.58);
  --clear: transparent;
  --shadow-near: 0 12px 24px rgba(12, 38, 74, 0.16);
  --shadow-far: 0 40px 80px rgba(12, 38, 74, 0.30);
  --shadow-cell: 0 18px 36px rgba(10, 32, 62, 0.28);
  --shadow-btn: 0 8px 20px rgba(8, 30, 60, 0.32);
  --shadow-sheet: 0 10px 22px rgba(12, 38, 74, 0.14);
  --r-layer: 40px;
  --r-section: 36px;
  --r-cell: 28px;
  --r-window: 24px;
  --r-btn: 14px;
  --r-panel: 14px;
  --r-tag: 6px;
  --r-pill: 999px;
  --r-round: 50%;
  --r-logo-preview: 9px;
  --r-shot: 10px;
  --r-geo: 22px;
  --r-phone: 34px;
  --r-screen: 27px;
  --r-phone-small: 28px;
  --r-screen-small: 22px;
  --r-phone-key: 3px;
  --font-display: "Iowan Old Style", "Charter", "Georgia", "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", serif;
  --font-body: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;
  --text-xs: 12px;
  --text-xs-plus: 12.5px;
  --text-chip: 11.5px;
  --text-sm: 13px;
  --text-sm-plus: 13.5px;
  --text-nav: 14.5px;
  --text-base: 16px;
  --text-body-small: 14px;
  --text-lead-small: 15.5px;
  --text-lead: 17px;
  --text-brand: 19px;
  --text-card-title: 20px;
  --text-h3: 24px;
  --text-h2: clamp(24px, 2.4vw, 34px);
  --text-h1: clamp(34px, 3.1vw, 48px);
  --text-hero: clamp(28px, 3.1vw, 44px);
  --text-facts: 30px;
  --leading-body: 1.6;
  --leading-title: 1.3;
  --tracking-title: 0.005em;
  --tracking-brand: 0.01em;
  --tracking-label: 0.04em;
  --wrap: 1280px;
  --reading: 860px;
  --gutter: 32px;
  --section-space: 140px;
  --header-height: 72px;
  --ease-ui: 180ms ease;
  --ease-lift: 250ms ease;
  --ease-reveal: 650ms ease;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 24px; }
html.nav-open { overflow: hidden; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-normal);
  color: var(--text);
  background: var(--bg);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
}
[hidden] { display: none !important; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
img { max-width: 100%; }
svg { display: block; flex-shrink: 0; }
h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  line-height: var(--leading-title);
  text-wrap: balance;
  overflow-wrap: break-word;
}
h1 { font-size: var(--text-h1); line-height: 1.18; letter-spacing: var(--tracking-title); }
h2 { font-size: var(--text-h2); }
h3 { font-size: var(--text-h3); }
h4 { font-size: var(--text-card-title); }
code, pre, .mono { font-family: var(--font-mono); }
code { overflow-wrap: anywhere; }
pre {
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: var(--r-panel);
  background: var(--paper-bar);
  color: var(--text);
  font-size: var(--text-sm);
  line-height: 1.8;
}
pre code { overflow-wrap: normal; white-space: pre; }
:focus-visible { outline: 3px solid var(--accent-dark); outline-offset: 4px; }
.stage :focus-visible, .site-footer :focus-visible, .masthead :focus-visible { outline-color: var(--accent); }
::selection { background: var(--accent); color: var(--text); }
.wrap {
  width: 100%;
  max-width: calc(var(--wrap) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.reading { max-width: calc(var(--reading) + var(--gutter) * 2); }
.section { padding-top: var(--section-space); padding-bottom: var(--section-space); }
.section + .section { padding-top: 0; }
.section-heading { max-width: 820px; margin-inline: auto; text-align: center; }
.section-heading p { margin-top: 18px; color: var(--text-muted); font-size: var(--text-lead); }
.flow > * + * { margin-top: 20px; }
.keep { white-space: nowrap; }
.muted { color: var(--text-muted); }
.em { color: var(--accent-dark); }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.grid-two, .grid-three { display: grid; gap: 24px; }
.grid-two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-two > *, .grid-three > *, .wrap > *, .prose > * { min-width: 0; }
.prose { overflow-wrap: break-word; }
.prose h2 { margin-top: 64px; margin-bottom: 22px; scroll-margin-top: 24px; }
.prose h3 { margin-top: 32px; margin-bottom: 16px; }
.prose p, .prose ul, .prose ol, .prose pre, .prose figure, .prose blockquote { margin-block: 20px; }
.prose p, .prose li { line-height: 1.9; }
.prose ul { padding-left: 24px; list-style: disc; }
.prose ol { padding-left: 24px; list-style: decimal; }
.prose li + li { margin-top: 8px; }
.prose a:not(.btn):not(.appstore-button) { color: var(--accent-dark); text-decoration: underline; text-underline-offset: 3px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 50px;
  max-width: 100%;
  padding: 10px 26px;
  border: 0;
  border-radius: var(--r-btn);
  font-family: var(--font-body);
  font-weight: var(--weight-semibold);
  font-size: var(--text-base);
  line-height: 1.4;
  text-align: center;
  transition: background-color var(--ease-ui), transform var(--ease-ui), border-color var(--ease-ui);
}
.btn svg { width: 18px; height: 18px; }
.btn-primary {
  min-width: 210px;
  background: var(--accent-dark);
  color: var(--on-accent);
  box-shadow: inset 0 1px 0 var(--hi-line), var(--shadow-btn);
}
.btn-primary:hover, .btn-primary.is-hover { background: var(--accent-dark-hover); color: var(--on-accent); transform: translateY(-1px); }
.btn-ghost {
  min-width: 170px;
  background: var(--clear);
  color: var(--on-dark);
  border: 1.5px solid var(--line-strong);
}
.btn-ghost:hover { background: var(--glass-row); color: var(--on-dark); border-color: var(--on-dark); }
.btn-secondary { background: var(--bg-panel); color: var(--accent-dark); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--paper-bar); color: var(--accent-dark); }
.btn:active { transform: translateY(1px); }
.btn:disabled, .btn[aria-disabled="true"] {
  background: var(--paper-bar);
  color: var(--text-muted);
  border: 1px solid var(--border);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}
.btn.is-focus { outline: 3px solid var(--accent-dark); outline-offset: 4px; }
.arrow { font-family: var(--font-mono); font-size: var(--text-lead-small); }
.card, .panel {
  min-width: 0;
  padding: 28px;
  border-radius: var(--r-cell);
  background: var(--bg-panel);
  color: var(--text);
  border: 1px solid var(--border);
}
.card { box-shadow: var(--shadow-sheet); }
.card p, .panel p { margin-top: 12px; color: var(--text-muted); }
.panel-cream { background: var(--bg-panel-2); color: var(--text); border-radius: var(--r-section); border: 0; }
.panel-dark { background: var(--bg); color: var(--on-dark); border: 0; border-radius: var(--r-section); }
.panel-dark p { color: var(--on-dark-muted); }
.panel-dark .em { color: var(--accent); }
.group-list { border-radius: var(--r-panel); border: 1px solid var(--border); overflow: hidden; background: var(--bg-panel); color: var(--text); }
.group-list a { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 52px; padding: 12px 18px; }
.group-list li + li { border-top: 1px solid var(--border); }
.group-list a:hover { background: var(--paper-bar); color: var(--accent-dark); }
.group-list .arrow { flex-shrink: 0; }
.reveal { opacity: 1; transform: none; }
.reveal.reveal-pending { opacity: 0; transform: translateY(18px); transition: opacity var(--ease-reveal), transform var(--ease-reveal); }
.reveal.shown { opacity: 1; transform: none; }
.decorated, .stage, .scene { overflow-x: clip; }
.masthead {
  position: relative;
  z-index: 50;
  border-bottom: 1px solid var(--line-dark);
  background: var(--bg);
  color: var(--on-dark);
}
.masthead-inner {
  max-width: min(100%, calc(1280px + var(--gutter) * 2));
  margin: 0 auto;
  padding-inline: var(--gutter);
  min-height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand-mark { width: 34px; height: 34px; border-radius: var(--r-round); flex-shrink: 0; box-shadow: var(--shadow-near); }
.brand-placeholder { display: block; background: var(--on-dark); color: var(--text); border-radius: var(--r-logo-preview); box-shadow: inset 0 0 0 2px var(--hi-line), var(--shadow-near); }
.brand-name { font-family: var(--font-display); font-weight: var(--weight-bold); font-size: var(--text-brand); letter-spacing: var(--tracking-brand); color: var(--on-dark); }
.mainnav { display: flex; align-items: center; min-width: 0; margin-left: auto; }
.mainnav ul { display: flex; align-items: center; gap: 2px; list-style: none; margin: 0; padding: 0; }
.navlink { display: inline-flex; align-items: center; gap: 7px; min-height: 44px; padding: 8px 12px; border-radius: var(--r-pill); font-size: var(--text-nav); font-weight: var(--weight-medium); color: var(--on-dark-muted); white-space: nowrap; transition: color var(--ease-ui), background-color var(--ease-ui); }
.navlink svg { width: 16px; height: 16px; flex-shrink: 0; }
.navlink:hover { color: var(--on-dark); background: var(--glass-row); }
.navlink[aria-current="page"] { color: var(--on-dark); background: var(--glass-top); box-shadow: inset 0 0 0 1px var(--line-dark); }
.header-tools { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.language-picker { position: relative; }
.lang { display: inline-flex; align-items: center; gap: 7px; min-height: 44px; padding: 7px 14px; border: 1px solid var(--line-dark); border-radius: var(--r-pill); background: var(--clear); color: var(--on-dark); font-family: var(--font-body); font-size: var(--text-body-small); font-weight: var(--weight-medium); white-space: nowrap; }
.lang svg { width: 15px; height: 15px; }
.lang-caret { color: var(--on-dark-muted); font-size: var(--text-xs); }
.lang-short { display: none; }
.language-menu { position: absolute; z-index: 4; right: 0; top: calc(100% + 10px); min-width: 180px; padding: 8px; background: var(--bg-panel); color: var(--text); border: 1px solid var(--border); border-radius: var(--r-panel); box-shadow: var(--shadow-near); }
.language-menu a { display: flex; align-items: center; min-height: 44px; padding: 10px 14px; border-radius: var(--r-tag); }
.language-menu a:hover, .language-menu a[aria-current="true"] { background: var(--paper-bar); color: var(--accent-dark); }
.menu-toggle { display: none; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; padding: 10px; border: 1px solid var(--line-dark); border-radius: var(--r-btn); background: var(--clear); color: var(--on-dark); }
.menu-toggle svg { width: 22px; height: 22px; }
.mobile-drawer { display: none; }
.menu-veil { position: fixed; z-index: 40; inset: 0; border: 0; padding: 0; background: var(--veil-bg); color: var(--on-dark); cursor: default; }
.preview-mobile { display: none; }
.site-footer { padding-top: 80px; padding-bottom: 36px; background: var(--cell-deep); color: var(--on-dark); }
.footer-grid { display: grid; grid-template-columns: 1.15fr 0.8fr 1.2fr 0.7fr; gap: 48px; }
.footer-grid > * { min-width: 0; }
.footer-brand p { margin-top: 20px; max-width: 350px; color: var(--on-dark-muted); font-size: var(--text-body-small); line-height: 1.85; }
.footer-heading { font-family: var(--font-body); font-size: var(--text-body-small); font-weight: var(--weight-semibold); margin-bottom: 18px; }
.footer-links { display: grid; gap: 4px; }
.footer-links a { display: inline-block; padding-block: 7px; color: var(--on-dark-muted); font-size: var(--text-body-small); overflow-wrap: anywhere; }
.footer-links a:hover { color: var(--on-dark); text-decoration: underline; text-underline-offset: 4px; }
.footer-bottom { margin-top: 64px; padding-top: 24px; border-top: 1px solid var(--line-dark); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px 28px; color: var(--on-dark-muted); font-size: var(--text-xs-plus); }
.footer-legal { display: flex; flex-wrap: wrap; gap: 20px; }
.footer-legal a:hover { color: var(--on-dark); }
@media (max-width: 1279px) {
  .mainnav { display: none; }
  .header-tools { margin-left: auto; }
  .menu-toggle { display: inline-flex; }
  .mobile-drawer {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: block;
    padding: 18px var(--gutter) 28px;
    max-height: calc(100dvh - var(--header-height));
    overflow-y: auto;
    overscroll-behavior: contain;
    background: var(--bg);
    color: var(--on-dark);
    box-shadow: var(--shadow-near);
  }
  .mobile-drawer .navlink { display: flex; width: 100%; min-height: 48px; padding: 12px 16px; white-space: normal; border-radius: var(--r-panel); }
  .drawer-languages { margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--line-dark); }
  .drawer-languages a { display: flex; align-items: center; min-height: 44px; width: 100%; padding: 10px 16px; color: var(--on-dark-muted); border-radius: var(--r-panel); }
  .drawer-languages a:hover, .drawer-languages a[aria-current="true"] { background: var(--glass-top); color: var(--on-dark); }
  .preview-mobile { display: block; }
  .preview-mobile > summary { display: flex; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; cursor: pointer; }
  .preview-mobile > nav { position: absolute; top: 100%; left: 0; right: 0; padding: 18px var(--gutter); max-height: calc(100dvh - var(--header-height)); overflow-y: auto; background: var(--bg); color: var(--on-dark); }
  .preview-mobile .navlink { display: flex; width: 100%; min-height: 48px; }
}
@media (max-width: 860px) {
  .grid-three { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 40px; }
}
@media (max-width: 768px) {
  :root { --text-h1: clamp(24px, 5vw, 30px); }
}
@media (max-width: 640px) {
  :root { --gutter: 18px; }
  .wrap { padding-inline: var(--gutter); }
  .grid-two, .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .masthead-inner { gap: 10px; }
  .masthead .brand { flex: 1 1 auto; min-width: 0; }
  .brand { gap: 8px; }
  .masthead .brand-name { min-width: 0; overflow: hidden; text-overflow: ellipsis; }
  .brand-name { font-size: var(--text-lead); }
  .brand-mark { width: 30px; height: 30px; }
  .header-tools { margin-left: auto; gap: 6px; }
  .lang { padding-inline: 10px; }
  .lang-full { display: none; }
  .lang-short { display: inline; }
  .card, .panel { padding: 24px; }
  .tilt, .tilted, [data-tilt] { transform: none !important; }
  .footer-bottom { margin-top: 40px; }
}
@media (max-width: 360px) {
  .brand-name { font-size: var(--text-body-small); }
  .brand { gap: 6px; }
  .masthead-inner { gap: 6px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .reveal.reveal-pending { opacity: 1; transform: none; }
  .btn:hover { transform: none; }
}