:root {
  --c-bg: #ffffff;
  --c-panel: #fcf1e6;
  --c-panel-2: #f5f6f4;
  --c-panel-line: #ecdcca;
  --c-border: #e2e6e3;
  --c-accent: #0b6e5f;
  --c-accent-dark: #06463c;
  --c-accent-wash: #d4eae2;
  --c-accent-tint: #e6f2ee;
  --c-text: #17302a;
  --c-muted: #5d6b66;
  --c-success: #1d8a5c;
  --c-warn: #b8742a;
  --c-error: #c2453a;
  --c-lake: #2f6fd6;
  --c-lake-wash: #d8e4f7;
  --c-apricot: #f6d9b4;
  --c-apricot-ink: #8a5520;
  --c-apricot-line: #dfb07a;
  --c-white: #ffffff;
  --c-clear: transparent;
  --font-display: "Iowan Old Style", "Charter", "Georgia", "Noto Serif SC", "Songti SC", "STSong", "Noto Serif CJK SC", "Hiragino Mincho ProN", "Nanum Myeongjo", serif;
  --font-body: "Inter", "Noto Sans SC", "Noto Sans JP", "Noto Sans KR", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans", "Microsoft YaHei", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --ls-display: -0.015em;
  --r-card: 14px;
  --r-inner: 10px;
  --r-shot: 10px;
  --r-pill: 999px;
  --r-panel: 28px;
  --r-logo: 9px;
  --r-small: 4px;
  --r-dot: 50%;
  --r-phone: 46px;
  --r-phone-screen: 36px;
  --r-tablet: 30px;
  --r-tablet-screen: 18px;
  --shadow-float: 0 18px 48px -20px rgba(6, 70, 60, 0.18);
  --shadow-near: 0 1px 2px rgba(6, 70, 60, 0.06), 0 6px 14px -8px rgba(6, 70, 60, 0.14);
  --shadow-card: var(--shadow-near), var(--shadow-float);
  --shadow-tag: 0 10px 20px -12px rgba(138, 85, 32, 0.42);
  --shadow-btn: 0 12px 26px -14px rgba(11, 110, 95, 0.6);
  --head-h: 76px;
  --hero-h: 768px;
  --gutter: clamp(20px, 3.4vw, 56px);
  --content-max: 1200px;
  --reading-max: 780px;
  --header-max: 1280px;
  --section-gap: 144px;
  --text-size: 16px;
  --h1-size: clamp(34px, 3.4vw, 48px);
  --h2-size: clamp(28px, 3.2vw, 40px);
  --h3-size: clamp(22px, 2.4vw, 28px);
  --ease: 200ms ease;
  --reveal-time: 600ms;
  --tilt-flat: 0deg;
  --tilt-rule: -2deg;
  --tilt-tag-a: 4deg;
  --tilt-tag-b: -3deg;
  --tilt-tag-c: 3deg;
}
*, *::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: var(--text-size)/1.6 var(--font-body);
  -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
button, a { -webkit-tap-highlight-color: var(--c-clear); }
img, svg { max-width: 100%; }
img { height: auto; }
svg { flex-shrink: 0; }
a { color: var(--c-accent); text-underline-offset: 4px; }
.prose a:hover, .text-link:hover { color: var(--c-lake); }
:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 4px; }
[hidden] { display: none !important; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: var(--ls-display);
  text-wrap: balance;
  overflow-wrap: break-word;
}
h1 { font-size: var(--h1-size); line-height: 1.12; }
h2 { font-size: var(--h2-size); line-height: 1.2; }
h3 { font-size: var(--h3-size); line-height: 1.3; }
h4 { font-size: 21px; line-height: 1.4; }
p { margin: 0 0 1.25em; }
strong { font-weight: 600; }
code, pre, .mono { font-family: var(--font-mono); }
code { font-size: .9em; overflow-wrap: anywhere; }
pre {
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  padding: 22px;
  background: var(--c-panel-2);
  color: var(--c-text);
  border-radius: var(--r-inner);
  line-height: 1.8;
  overscroll-behavior-inline: contain;
}
pre code { overflow-wrap: normal; word-break: normal; white-space: pre; }
ul, ol { padding-left: 1.4em; }
li + li { margin-top: .35em; }
.wrap {
  width: 100%;
  max-width: calc(var(--content-max) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.reading { max-width: calc(var(--reading-max) + var(--gutter) * 2); }
.section { margin-top: var(--section-gap); }
.section-pad { padding-top: 56px; padding-bottom: 56px; }
.section-head { max-width: 720px; margin-bottom: 40px; }
.section-head h2 { margin-top: 0; margin-bottom: 20px; }
.prose { min-width: 0; line-height: 1.85; }
.prose h2 { margin-top: 72px; margin-bottom: 24px; }
.prose h3 { margin-top: 40px; margin-bottom: 20px; }
.prose img { max-width: 100%; }
.prose :is(section, div, article) { min-width: 0; }
.muted { color: var(--c-muted); }
.em, .text-accent { color: var(--c-accent); }
.nowrap { white-space: nowrap; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.skip {
  position: absolute;
  top: 12px;
  left: 16px;
  z-index: 100;
  padding: 8px 16px;
  border-radius: var(--r-pill);
  background: var(--c-accent);
  color: var(--c-white);
  text-decoration: none;
  transform: translateY(-160%);
}
.skip:focus { transform: none; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 52px;
  max-width: 100%;
  padding: 12px 28px;
  border: 0;
  border-radius: var(--r-pill);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 500;
  line-height: 1.4;
  text-align: center;
  text-decoration: none;
  transition: transform var(--ease), background-color var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.btn--solid {
  background: var(--c-accent);
  color: var(--c-white);
  box-shadow: var(--shadow-btn);
}
.btn--solid:hover, .btn--solid.is-hover { background: var(--c-accent-dark); color: var(--c-white); }
.btn--line {
  border: 1.5px solid var(--c-accent-dark);
  background: var(--c-clear);
  color: var(--c-accent-dark);
}
.btn--line:hover, .btn--line.is-hover { background: var(--c-panel-2); color: var(--c-accent-dark); }
.btn:disabled, .btn[aria-disabled="true"] {
  background: var(--c-panel-2);
  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); outline-offset: 4px; }
.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  min-width: 44px;
  min-height: 44px;
  border: 1.5px solid var(--c-accent-dark);
  border-radius: var(--r-pill);
  background: var(--c-bg);
  color: var(--c-text);
}
.icon-button svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.5; }
.surface-card {
  min-width: 0;
  padding: 28px;
  border-radius: var(--r-card);
  background: var(--c-white);
  color: var(--c-text);
  box-shadow: var(--shadow-card);
}
.fact-panel {
  padding: 56px;
  border-radius: var(--r-panel);
  background: var(--c-panel-2);
  color: var(--c-text);
}
.grid-two, .grid-three {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}
.grid-three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-two > *, .grid-three > * { min-width: 0; }
.decorated { position: relative; overflow-x: clip; }
.reveal { opacity: 1; transform: none; }
html.reveal-ready .reveal:not(.shown) { opacity: 0; transform: translateY(18px); }
html.reveal-ready .reveal {
  transition: opacity var(--reveal-time) ease, transform var(--reveal-time) ease;
}
.site-head { position: relative; z-index: 40; background: var(--c-bg); color: var(--c-text); }
.head-in {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: var(--head-h);
  width: 100%;
  max-width: min(100%, calc(var(--header-max) + var(--gutter) * 2));
  padding-inline: var(--gutter);
  margin-inline: auto;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
  color: var(--c-text);
  text-decoration: none;
}
.brand-mark {
  display: block;
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-logo);
  background: var(--c-white);
  color: var(--c-text);
  box-shadow: var(--shadow-near);
}
.brand-name { font: 20px/1.3 var(--font-display); letter-spacing: var(--ls-display); white-space: nowrap; }
.nav { min-width: 0; margin-left: auto; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-list li { margin: 0; }
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 40px;
  padding: 8px 14px;
  border-radius: var(--r-pill);
  color: var(--c-text);
  font-size: 15px;
  text-decoration: none;
  cursor: pointer;
  list-style: none;
  white-space: nowrap;
}
summary::-webkit-details-marker { display: none; }
.nav-link:hover { background: var(--c-panel-2); color: var(--c-accent); }
.nav-link.is-active { color: var(--c-accent-dark); }
.nav-link.is-active::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 3px;
  height: 2px;
  border-radius: var(--r-small);
  background: var(--c-accent);
}
.chev {
  width: 10px;
  height: 10px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform var(--ease);
}
details[open] > summary .chev { transform: rotate(180deg); }
.drop { position: relative; }
.drop-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  width: 264px;
  max-width: calc(100vw - var(--gutter) * 2);
  padding: 8px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-card);
  background: var(--c-white);
  color: var(--c-text);
  box-shadow: var(--shadow-card);
}
.drop-label {
  display: block;
  padding: 8px 12px 4px;
  font: 11px/1.5 var(--font-mono);
  letter-spacing: .06em;
  color: var(--c-muted);
}
.drop-menu a {
  display: block;
  min-height: 44px;
  padding: 10px 12px;
  border-radius: var(--r-inner);
  color: var(--c-text);
  font-size: 15px;
  line-height: 1.4;
  text-decoration: none;
}
.drop-menu a small { display: block; margin-top: 2px; color: var(--c-muted); font-size: 12.5px; }
.drop-menu a:hover { background: var(--c-panel-2); color: var(--c-accent-dark); }
.drop-menu a[aria-current] { color: var(--c-accent); }
.head-tools { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.lang-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 40px;
  padding: 8px 16px 8px 14px;
  border: 1.5px solid var(--c-accent-dark);
  border-radius: var(--r-pill);
  background: var(--c-clear);
  color: var(--c-accent-dark);
  font-size: 14.5px;
  list-style: none;
  white-space: nowrap;
  cursor: pointer;
}
.lang-btn:hover { background: var(--c-panel-2); color: var(--c-accent-dark); }
.globe { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 1.5; }
.lang-short { display: none; }
.lang .drop-menu { width: 200px; }
.menu-toggle { display: none; }
.mobile-drawer { display: none; }
.site-foot {
  margin-top: var(--section-gap);
  padding-top: 64px;
  padding-bottom: 28px;
  background: var(--c-panel-2);
  color: var(--c-text);
}
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1.2fr; gap: 56px; }
.foot-grid > * { min-width: 0; }
.foot-brand p { margin-top: 22px; max-width: 350px; font-size: 14px; color: var(--c-muted); }
.foot-title { margin: 0 0 20px; font-size: 20px; }
.foot-links { padding: 0; margin: 0; list-style: none; }
.foot-links a { display: inline-block; padding-block: 6px; font-size: 14px; color: var(--c-text); text-decoration: none; }
.foot-links a:hover { color: var(--c-accent); text-decoration: underline; }
.foot-languages { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 48px; }
.foot-languages a { padding-block: 8px; font-size: 14px; color: var(--c-text); }
.foot-languages [aria-current] { color: var(--c-accent); }
.foot-bottom { margin-top: 28px; color: var(--c-muted); font-size: 12.5px; }
.foot-bottom p { margin-bottom: 8px; }
@media (max-width: 1100px) {
  .nav { display: none; }
  .head-tools { margin-left: auto; }
  .menu-toggle { display: inline-flex; }
  .mobile-drawer:not([hidden]) {
    display: block;
    position: absolute;
    top: var(--head-h);
    left: 0;
    right: 0;
    z-index: 45;
    padding: 20px var(--gutter) 28px;
    max-height: calc(100dvh - var(--head-h));
    overflow-y: auto;
    overscroll-behavior: contain;
    background: var(--c-bg);
    color: var(--c-text);
    box-shadow: var(--shadow-float);
  }
  .mobile-drawer a {
    display: flex;
    align-items: center;
    width: 100%;
    min-height: 48px;
    padding: 12px 16px;
    border-radius: var(--r-inner);
    color: var(--c-text);
    text-decoration: none;
  }
  .mobile-drawer a:hover, .mobile-drawer a[aria-current] { background: var(--c-panel-2); color: var(--c-accent); }
  .drawer-languages { margin-top: 20px; }
}
@media (max-width: 768px) {
  h1 { font-size: clamp(24px, 4vw, 30px); }
  .grid-three { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .foot-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
  .foot-brand { grid-column: 1 / -1; }
}
@media (max-width: 640px) {
  :root { --gutter: 20px; }
  .head-in { gap: 10px; }
  .head-tools { gap: 8px; margin-left: auto; }
  .brand { gap: 9px; }
  .brand-name { font-size: 17px; }
  .brand-mark { width: 32px; height: 32px; }
  .lang-btn { padding: 8px 10px; font-size: 13px; }
  .lang-full, .lang-btn .globe { display: none; }
  .lang-short { display: inline; }
  .btn { min-height: 48px; padding: 12px 22px; font-size: 15px; }
  .grid-two, .grid-three { grid-template-columns: minmax(0, 1fr); }
  .surface-card { padding: 22px; }
  .fact-panel { padding: 32px 24px; }
  .tilt, .card, [data-tilt] { transform: none !important; }
  .foot-grid { grid-template-columns: minmax(0, 1fr); }
  .foot-brand { grid-column: auto; }
  pre { padding: 16px; font-size: 13px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html.reveal-ready .reveal:not(.shown) { opacity: 1; transform: none; }
}