:root {
  --c-bg: #f4f4f1;
  --c-panel: #ffffff;
  --c-navy: #0f2d44;
  --c-border: #e3e2dc;
  --c-accent: #f4b93a;
  --c-accent-dark: #c88a12;
  --c-text: #13283a;
  --c-muted: #5e6b76;
  --c-success: #2f8f5b;
  --c-coral: #e07856;
  --c-coral-soft: #e9b9a6;
  --c-error: #c4452f;
  --c-faint: #9aa1a7;
  --c-gutter: #f8f8f6;
  --c-bar: #efeeea;
  --c-clear: transparent;
  --c-scan: rgba(244, 185, 58, .28);
  --c-mark: rgba(244, 185, 58, .5);
  --c-coral-ring: rgba(224, 120, 86, .18);
  --c-success-ring: rgba(47, 143, 91, .18);
  --c-navy-line: rgba(15, 45, 68, .16);
  --c-navy-hover: rgba(15, 45, 68, .05);
  --c-on-navy: rgba(255, 255, 255, .78);
  --c-on-navy-dot: rgba(255, 255, 255, .075);
  --c-on-navy-glow: rgba(255, 255, 255, .08);
  --c-ghost: rgba(255, 255, 255, .06);
  --c-ghost-line: rgba(255, 255, 255, .14);
  --c-veil: rgba(15, 45, 68, .35);
  --c-label-ink: var(--c-navy);
  --c-code-section: var(--c-error);

  --sh-soft: 0 1px 2px rgba(19, 40, 58, .05), 0 8px 22px -14px rgba(19, 40, 58, .24);
  --sh-pop: 0 2px 6px rgba(19, 40, 58, .06), 0 26px 50px -22px rgba(19, 40, 58, .32);
  --sh-doc: 0 2px 4px rgba(4, 18, 30, .22), 0 18px 34px -14px rgba(4, 18, 30, .5), 0 46px 84px -40px rgba(4, 18, 30, .62);
  --sh-verify: 0 2px 4px rgba(4, 18, 30, .16), 0 24px 42px -18px rgba(4, 18, 30, .48);
  --sh-cta: inset 0 -2px 0 rgba(200, 138, 18, .38), 0 12px 24px -12px rgba(200, 138, 18, .72);
  --sh-cta-sm: inset 0 -2px 0 rgba(200, 138, 18, .32), 0 8px 16px -10px rgba(200, 138, 18, .6);

  --f-display: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans', 'Apple SD Gothic Neo', 'Microsoft YaHei', sans-serif;
  --f-body: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Hiragino Sans', 'Apple SD Gothic Neo', 'Microsoft YaHei', sans-serif;
  --f-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  --fs-xs: .75rem;
  --fs-sm: .875rem;
  --fs-base: 1rem;
  --fs-lead: 1.03125rem;
  --fs-subtitle: clamp(1.125rem, 1.6vw, 1.375rem);
  --fs-h1: clamp(2.125rem, 3.2vw, 3rem);
  --fs-hero: clamp(1.875rem, 3.2vw, 2.875rem);
  --fs-h2: clamp(1.5rem, 2.5vw, 2.125rem);
  --fs-h3: 1.25rem;
  --fs-brand: 1.125rem;
  --fs-nav: .96875rem;
  --fs-strip: .71875rem;
  --fs-doc: .90625rem;
  --fs-doc-small: .78125rem;
  --fs-caption: .8125rem;
  --fs-device: .84375rem;
  --fw-normal: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;
  --fw-heavy: 800;
  --leading-body: 1.6;
  --leading-title: 1.14;
  --tracking-title: -.02em;

  --r-frame: 40px;
  --r-card: 24px;
  --r-menu: 20px;
  --r-doc: 18px;
  --r-verify: 16px;
  --r-chip: 12px;
  --r-logo: 9px;
  --r-shot: 10px;
  --r-frame-corner: 14px;
  --r-frame-mobile: 28px;
  --r-pill: 999px;
  --r-round: 50%;
  --r-none: 0;

  --gutter: 48px;
  --content-width: 1376px;
  --reading-width: 880px;
  --header-content-width: 1280px;
  --section-space: 80px;
  --header-height: 108px;
  --ln: 31px;
  --gut: 54px;
  --pad-code: 18px;
  --motion-fast: .18s;
  --motion-reveal: .6s;
}

*, *::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;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--f-body);
  font-size: var(--fs-base);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
[hidden] { display: none !important; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { padding: 0; border: 0; background: none; cursor: pointer; }
img { max-width: 100%; }
svg { display: inline-block; vertical-align: middle; flex-shrink: 0; }
ul, ol, dl, dd, p, h1, h2, h3, h4, figure, blockquote { margin: 0; padding: 0; }
ul, ol { list-style: none; }
h1, h2, h3, h4 {
  font-family: var(--f-display);
  font-weight: var(--fw-heavy);
  letter-spacing: var(--tracking-title);
  color: var(--c-navy);
  text-wrap: balance;
  overflow-wrap: normal;
}
h1 { font-size: var(--fs-h1); line-height: var(--leading-title); }
h2 { font-size: var(--fs-h2); line-height: 1.2; }
h3 { font-size: var(--fs-h3); line-height: 1.35; }
strong { font-weight: var(--fw-bold); }
code, pre, .mono { font-family: var(--f-mono); }
code { overflow-wrap: anywhere; }
pre {
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  padding: 20px;
  background: var(--c-gutter);
  color: var(--c-text);
  border: 1px solid var(--c-border);
  border-radius: var(--r-chip);
  font-size: var(--fs-sm);
  tab-size: 2;
}
pre code { overflow-wrap: normal; white-space: pre; }
:focus-visible {
  outline: 2px solid var(--c-accent-dark);
  outline-offset: 3px;
  border-radius: var(--r-chip);
}
::selection { background: var(--c-mark); color: var(--c-navy); }
.skip {
  position: absolute;
  left: 12px;
  top: 10px;
  z-index: 100;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  background: var(--c-panel);
  color: var(--c-navy);
  border-radius: var(--r-chip);
  box-shadow: var(--sh-soft);
}
.skip:focus {
  width: auto;
  height: auto;
  padding: 8px 14px;
  clip-path: none;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.wrap {
  width: 100%;
  max-width: var(--content-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.reading { max-width: var(--reading-width); }
.section { padding-top: var(--section-space); padding-bottom: var(--section-space); }
.section-white { background: var(--c-panel); color: var(--c-text); }
.section-navy {
  background: var(--c-navy);
  color: var(--c-panel);
  border-radius: var(--r-frame);
  padding: 48px;
}
.section-navy h2, .section-navy h3 { color: var(--c-panel); }
.section-navy p { color: var(--c-on-navy); }
.section-coral {
  position: relative;
  overflow-x: clip;
  background: var(--c-coral);
  color: var(--c-navy);
  clip-path: polygon(0 6%, 100% 0, 100% 100%, 0 100%);
  padding-top: 100px;
  padding-bottom: 80px;
}
.section-coral .home-intro { color: var(--c-navy); }
.hero .orbit-art {
  position: relative;
  width: min(100%, 360px);
  aspect-ratio: 1;
  margin-inline: auto;
}
.hero .orbit-art span {
  position: absolute;
  inset: 12%;
  border: 2px solid var(--c-accent);
  border-radius: 50%;
}
.hero .orbit-art span:nth-child(2) { inset: 25% 0; transform: rotate(-35deg); }
.hero .orbit-art span:nth-child(3) { inset: 38%; background: var(--c-coral); border: 0; }
.hero .frame:has(.orbit-art) {
  height: auto;
  padding: 48px 24px 24px;
}
.hero .frame:has(.orbit-art) .verify {
  position: relative;
  inset: auto;
  width: min(100%, 300px);
  margin: 24px auto 0;
  transform: none;
}
.section-head { text-align: center; margin-bottom: 40px; }
.section-head h2 { margin-top: 14px; }
.eyebrow {
  display: inline-block;
  font-size: var(--fs-doc-small);
  font-weight: var(--fw-semibold);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--c-label-ink);
  border-bottom: 3px solid var(--c-coral);
  padding-bottom: 3px;
}
.keep { white-space: nowrap; }
.muted { color: var(--c-muted); }
.stack > * + * { margin-top: 20px; }
.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)); }
:where(.wrap, .grid-two, .grid-three, .hero-in, .feature-tabs, .footer-grid, .article-layout) > * { min-width: 0; }
.card, .panel {
  padding: 28px;
  min-width: 0;
  background: var(--c-panel);
  color: var(--c-text);
  border: 1px solid var(--c-border);
  border-radius: var(--r-card);
  box-shadow: var(--sh-soft);
}
.card h3 + p, .panel h3 + p { margin-top: 12px; }
.card p, .panel p { color: var(--c-muted); }
.card-link { display: block; transition: transform var(--motion-fast), box-shadow var(--motion-fast); }
.card-link:hover { transform: translateY(-3px); box-shadow: var(--sh-pop); }
.text-link { text-decoration: underline; text-underline-offset: 4px; color: var(--c-navy); }
.btn, .pill-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 54px;
  padding: 12px 28px;
  max-width: 100%;
  border-radius: var(--r-pill);
  font-size: var(--fs-base);
  font-weight: var(--fw-bold);
  letter-spacing: .01em;
  text-align: center;
  line-height: 1.4;
  transition: transform var(--motion-fast), box-shadow var(--motion-fast), background-color var(--motion-fast);
}
.btn-main, .pill-cta {
  background: var(--c-accent);
  color: var(--c-navy);
  box-shadow: var(--sh-cta);
}
.btn-main svg { width: 19px; height: 19px; margin-top: -3px; }
.btn-main:hover, .pill-cta:hover, .btn.is-hover { transform: translateY(-1px); box-shadow: var(--sh-pop); }
.btn:active, .pill-cta:active, .btn.is-active { transform: translateY(1px); box-shadow: var(--sh-soft); }
.btn-line {
  background: var(--c-panel);
  color: var(--c-navy);
  border: 1.5px solid var(--c-navy);
  padding-inline: 24px;
}
.btn-line svg { width: 16px; height: 16px; transition: transform var(--motion-fast); }
.btn-line:hover svg { transform: translateX(3px); }
.btn:disabled, .btn[aria-disabled="true"] {
  background: var(--c-bar);
  color: var(--c-muted);
  border: 1px solid var(--c-border);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}
.btn.is-focus { outline: 2px solid var(--c-accent-dark); outline-offset: 3px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
.pill-cta { min-height: 44px; padding: 10px 22px; font-size: var(--fs-nav); box-shadow: var(--sh-cta-sm); }
.pill-cta svg { width: 16px; height: 16px; margin-top: -2px; }

.strip { border-bottom: 1px solid var(--c-border); }
.strip-in {
  height: 32px;
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--f-mono);
  font-size: var(--fs-strip);
  letter-spacing: .02em;
  color: var(--c-muted);
  white-space: nowrap;
  overflow: hidden;
}
.strip-dot, .ok-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  flex-shrink: 0;
  border-radius: var(--r-round);
  background: var(--c-success);
  color: var(--c-navy);
  box-shadow: 0 0 0 3px var(--c-success-ring);
}
.strip-sep { color: var(--c-muted); }
.topbar, #site-header { position: relative; z-index: 40; }
.topbar-in {
  position: relative;
  width: 100%;
  max-width: min(100%, calc(var(--header-content-width) + var(--gutter) * 2));
  margin-inline: auto;
  padding-inline: var(--gutter);
  height: 76px;
  display: flex;
  align-items: center;
  background: var(--c-bg);
  color: var(--c-text);
  z-index: 2;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  font-family: var(--f-display);
  font-weight: var(--fw-heavy);
  font-size: var(--fs-brand);
  letter-spacing: var(--tracking-title);
  color: var(--c-navy);
}
.brand-mark {
  display: block;
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  border-radius: var(--r-logo);
  background: var(--c-panel);
  color: var(--c-navy);
  border: 1px solid var(--c-border);
  box-shadow: var(--sh-soft);
}
.nav { margin-left: 60px; min-width: 0; }
.nav-list { display: flex; align-items: center; list-style: none; margin: 0; padding: 0; gap: 6px; }
.nav-list > li { flex-shrink: 0; }
.nav-list > li > a, .nav-more-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 40px;
  padding: 8px 14px;
  border-radius: var(--r-pill);
  font-size: var(--fs-nav);
  font-weight: var(--fw-medium);
  color: var(--c-text);
  white-space: nowrap;
  transition: background-color var(--motion-fast), color var(--motion-fast);
}
.nav-list > li > a:hover, .nav-more-btn:hover, .nav-more-btn[aria-expanded="true"] {
  background: var(--c-navy-hover);
  color: var(--c-navy);
}
.nav a[aria-current="page"], .mobile-drawer a[aria-current="page"] {
  box-shadow: inset 0 0 0 2px var(--c-accent);
}
.chev { width: 14px; height: 14px; transition: transform var(--motion-fast); }
[aria-expanded="true"] > .chev, details[open] > summary .chev { transform: rotate(180deg); }
.nav-more { position: relative; }
.nav-more > summary { list-style: none; }
.nav-more > summary::-webkit-details-marker { display: none; }
.menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 50%;
  transform: translateX(-50%);
  width: 480px;
  padding: 18px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px 14px;
  background: var(--c-panel);
  color: var(--c-text);
  border: 1px solid var(--c-border);
  border-radius: var(--r-menu);
  box-shadow: var(--sh-pop);
  z-index: 5;
}
.menu-group { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.menu-label {
  padding: 4px 12px 8px;
  font-size: var(--fs-strip);
  font-weight: var(--fw-semibold);
  letter-spacing: .12em;
  color: var(--c-muted);
}
.menu a { display: block; width: 100%; min-height: 44px; padding: 10px 12px; border-radius: var(--r-chip); }
.menu a:hover { background: var(--c-bg); color: var(--c-navy); }
.menu b { display: block; font-size: var(--fs-doc); font-weight: var(--fw-semibold); color: var(--c-navy); }
.menu small { display: block; font-size: var(--fs-doc-small); line-height: 1.5; color: var(--c-muted); }
.tools { display: flex; align-items: center; gap: 14px; margin-left: auto; flex-shrink: 0; }
.language-picker { position: relative; }
.lang {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 44px;
  padding: 8px 12px;
  border-radius: var(--r-pill);
  font-size: var(--fs-sm);
  color: var(--c-muted);
  white-space: nowrap;
}
.lang:hover { background: var(--c-navy-hover); color: var(--c-navy); }
.lang svg { width: 16px; height: 16px; }
.lang-short { display: none; }
.language-menu {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  width: 190px;
  padding: 8px;
  background: var(--c-panel);
  color: var(--c-text);
  border: 1px solid var(--c-border);
  border-radius: var(--r-verify);
  box-shadow: var(--sh-pop);
  z-index: 6;
}
.language-menu a { display: block; min-height: 44px; padding: 10px 12px; border-radius: var(--r-chip); }
.language-menu a:hover, .language-menu a[aria-current="true"] { background: var(--c-bg); color: var(--c-navy); }
.hamburger {
  display: none;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-chip);
  background: var(--c-panel);
  color: var(--c-navy);
}
.hamburger svg { width: 22px; height: 22px; }
.mobile-drawer {
  display: none;
  position: absolute;
  top: 100%;
  left: var(--gutter);
  right: var(--gutter);
  padding: 16px;
  max-height: calc(100dvh - var(--header-height) - 16px);
  overflow-y: auto;
  overscroll-behavior: contain;
  background: var(--c-panel);
  color: var(--c-text);
  border: 1px solid var(--c-border);
  border-radius: var(--r-menu);
  box-shadow: var(--sh-pop);
  z-index: 4;
}
.mobile-drawer a { display: flex; align-items: center; width: 100%; min-height: 46px; padding: 11px 14px; border-radius: var(--r-chip); }
.mobile-drawer a:hover { background: var(--c-bg); color: var(--c-navy); }
.drawer-languages { margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--c-border); }
.nav-veil { position: fixed; inset: var(--header-height) 0 0; background: var(--c-veil); color: var(--c-panel); z-index: 1; }

.site-footer {
  margin-top: 0;
  padding-top: 64px;
  padding-bottom: 28px;
  background: var(--c-navy);
  color: var(--c-panel);
  overflow-x: clip;
}
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1.2fr .7fr; gap: 40px; }
.site-footer .brand { color: var(--c-panel); }
.footer-intro { margin-top: 18px; max-width: 28em; color: var(--c-on-navy); font-size: var(--fs-sm); }
.footer-heading { margin-bottom: 16px; font-size: var(--fs-sm); color: var(--c-panel); }
.footer-links { display: grid; gap: 4px; }
.footer-links a { display: block; padding-block: 7px; color: var(--c-on-navy); font-size: var(--fs-sm); overflow-wrap: anywhere; }
.footer-links a:hover { color: var(--c-accent); text-decoration: underline; text-underline-offset: 4px; }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin-top: 44px;
  padding-top: 24px;
  border-top: 1px solid var(--c-ghost-line);
  color: var(--c-on-navy);
  font-size: var(--fs-xs);
}
.footer-bottom a { color: var(--c-panel); text-decoration: underline; text-underline-offset: 3px; }

.prose { min-width: 0; }
.prose p { margin-block: 16px; }
.prose h2 { margin-top: 48px; margin-bottom: 20px; }
.prose h3 { margin-top: 32px; margin-bottom: 16px; }
.prose ul, .prose ol { padding-left: 1.5em; margin-block: 18px; list-style: revert; }
.prose li + li { margin-top: 8px; }
.prose a:not(.btn):not(.app-store-button) { text-decoration: underline; text-underline-offset: 4px; }
.prose :not(pre) > code { padding: 2px 5px; border-radius: var(--r-logo); background: var(--c-bar); color: var(--c-navy); font-size: var(--fs-sm); }
.prose pre { margin-block: 24px; }
.reveal { opacity: 1; transform: none; }
.reveal-ready .reveal:not(.shown) { opacity: 0; transform: translateY(18px); }
.reveal-ready .reveal { transition: opacity var(--motion-reveal) ease, transform var(--motion-reveal) ease; }
.reveal.shown { opacity: 1; transform: none; }

@media (max-width: 1200px) {
  :root { --gutter: 36px; }
  .nav { margin-left: 36px; }
  .tools { gap: 8px; }
}
@media (max-width: 1100px) {
  .nav { display: none; }
  .tools { margin-left: auto; }
  .hamburger { display: inline-flex; }
  .mobile-drawer:not([hidden]) { display: block; }
}
@media (max-width: 960px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-three { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 768px) {
  :root { --fs-h1: clamp(1.5rem, 4vw, 1.875rem); --fs-hero: clamp(1.5rem, 4vw, 1.875rem); --section-space: 56px; }
}
@media (max-width: 640px) {
  :root { --gutter: 18px; }
  .grid-two, .grid-three { grid-template-columns: minmax(0, 1fr); }
  .card, .panel { padding: 22px; }
  .section-navy { padding: 28px 22px; border-radius: var(--r-frame-mobile); }
  .tools { gap: 4px; margin-left: auto; }
  .tools > .pill-cta { display: none; }
  .lang-full { display: none; }
  .lang-short { display: inline; }
  .lang { padding-inline: 8px; gap: 4px; }
  .lang > svg { display: none; }
  .brand-name { font-size: var(--fs-base); }
  .strip-in { gap: 8px; font-size: var(--fs-xs); }
  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: 28px; }
  .footer-links { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 4px 16px; }
  .footer-bottom { flex-direction: column; }
  .tilt, .verify, [data-tilt] { transform: none; }
}
@media (max-width: 400px) {
  .brand { gap: 8px; }
  .brand-name { font-size: var(--fs-caption); }
  .brand-mark { width: 30px; height: 30px; }
  .strip-in { font-size: var(--fs-strip); }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
  .reveal-ready .reveal:not(.shown) { opacity: 1; transform: none; }
}
@media print {
  .tools, .nav, .mobile-drawer, .nav-veil, .dl-fab { display: none !important; }
  .reveal-ready .reveal:not(.shown) { opacity: 1; transform: none; }
}