:root {
  --bg: #0a2a30;
  --bg-panel: #0f3a3f;
  --bg-panel-2: #14494e;
  --bg-deep: #072226;
  --device-body: #0b3237;
  --border: #2a5c61;
  --accent: #a06bff;
  --accent-dark: #7c4dff;
  --mint: #2fd4a7;
  --rose: #ff6f91;
  --gradient-mid: #c2408f;
  --lavender: #dccdff;
  --text: #eef7f5;
  --text-muted: #9fc0bd;
  --warn: #ff9aae;
  --error: #ff4f74;
  --white: #ffffff;
  --mask-on: #ffffff;
  --shadow-ink: #021013;
  --nav-bg: #ffffff;
  --nav-ink: #0a2a30;
  --nav-ink-muted: #4a6d70;
  --nav-line: #e3eeec;
  --card-light: #f3f9f8;
  --card-light-line: #dbe8e6;
  --card-ink: #0a2a30;
  --card-ink-muted: #6a8a8c;
  --radius-card: 8px;
  --radius-btn: 6px;
  --radius-pill: 999px;
  --radius-device: 40px;
  --radius-screen: 30px;
  --radius-mark: 9px;
  --radius-feature: 16px;
  --radius-shot: 10px;
  --font-display: "Inter", "Noto Sans SC", "Noto Sans JP", "Noto Sans KR", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "Noto Sans SC", "Noto Sans JP", "Noto Sans KR", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-strong: 600;
  --tracking-heading: -.02em;
  --gutter: 48px;
  --wrap-max: 1440px;
  --reading-max: 840px;
  --header-height: 64px;
  --section-space: 144px;
  --motion-fast: .2s;
  --motion-soft: .35s;
  --line-soft: color-mix(in srgb, var(--border) 72%, transparent);
  --line-white: color-mix(in srgb, var(--white) 24%, transparent);
  --line-white-faint: color-mix(in srgb, var(--white) 10%, transparent);
  --glass: color-mix(in srgb, var(--bg-deep) 86%, transparent);
  --h1-grad: linear-gradient(90deg, var(--accent) 0%, var(--lavender) 48%, var(--rose) 100%);
  --break-grad: linear-gradient(130deg, var(--accent-dark), var(--gradient-mid) 55%, var(--rose));
  --shadow-float: inset 0 1px 0 color-mix(in srgb, var(--white) 8%, transparent), 0 10px 20px -10px color-mix(in srgb, var(--shadow-ink) 75%, transparent), 0 30px 60px -20px color-mix(in srgb, var(--shadow-ink) 90%, transparent);
  --shadow-float-light: 0 2px 4px color-mix(in srgb, var(--shadow-ink) 18%, transparent), 0 18px 36px -14px color-mix(in srgb, var(--shadow-ink) 70%, transparent), 0 30px 70px -28px color-mix(in srgb, var(--accent) 55%, transparent);
  --shadow-device: 0 0 0 5px color-mix(in srgb, var(--mint) 9%, transparent), 0 0 28px color-mix(in srgb, var(--mint) 42%, transparent), 0 48px 90px -36px color-mix(in srgb, var(--shadow-ink) 95%, transparent);
  --shadow-btn: 0 10px 24px -10px color-mix(in srgb, var(--accent-dark) 80%, transparent);
  --shadow-nav: 0 1px 0 var(--nav-line);
  --shadow-dropdown: 0 18px 40px -16px color-mix(in srgb, var(--shadow-ink) 45%, transparent);
  --shadow-hover: 0 22px 44px -26px color-mix(in srgb, var(--shadow-ink) 90%, transparent);
}

*, *::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(--bg);
  color: var(--text);
  font: var(--weight-normal) 16px/1.6 var(--font-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
main, section, article, aside, nav, div, li, figure { min-width: 0; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: .22em; }
a:hover { text-decoration: underline; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
button, a { -webkit-tap-highlight-color: transparent; }
button:disabled { cursor: not-allowed; }
img { max-width: 100%; }
svg { flex-shrink: 0; }
button svg, a svg { flex-shrink: 0; }
[hidden] { display: none !important; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: var(--radius-btn); }
::selection { background: var(--lavender); color: var(--bg-deep); }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--weight-normal);
  letter-spacing: var(--tracking-heading);
  text-wrap: balance;
  overflow-wrap: break-word;
}
h1 { font-size: clamp(34px, 3.3vw, 48px); line-height: 1.15; }
h2 { font-size: clamp(26px, 2.6vw, 40px); line-height: 1.25; }
h3 { font-size: 22px; line-height: 1.35; }
h4 { font-size: 18px; }
p, li, dd { overflow-wrap: break-word; }
strong { font-weight: var(--weight-strong); }
code, pre, kbd { font-family: var(--font-mono); }
code { overflow-wrap: anywhere; }
pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-card);
  background: var(--bg-deep);
  color: var(--text);
  font-size: 13px;
  line-height: 1.85;
  tab-size: 2;
}
pre code { white-space: pre; overflow-wrap: normal; word-break: normal; }
.wrap {
  width: 100%;
  max-width: var(--wrap-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.reading { width: 100%; max-width: calc(var(--reading-max) + var(--gutter) * 2); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-top: var(--section-space); padding-bottom: var(--section-space); }
.section + .section { padding-top: 0; }
.section__intro { max-width: 720px; margin-bottom: 40px; }
.section__intro h2 { margin-top: 0; }
.section__intro p, .muted { color: var(--text-muted); }
.mono { font-family: var(--font-mono); }
.keep { white-space: nowrap; }
.stack > * + * { margin-top: 24px; }
.grid-two { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.grid-three { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: 8px; left: 16px; z-index: 100; padding: 12px 18px; background: var(--nav-bg); color: var(--nav-ink); transform: translateY(-160%); border-radius: var(--radius-btn); }
.skip-link:focus { transform: none; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-btn);
  font: var(--weight-strong) 15.5px/1.3 var(--font-body);
  letter-spacing: -.005em;
  text-decoration: none;
  text-align: center;
  transition: background-color var(--motion-fast), border-color var(--motion-fast), transform var(--motion-fast);
}
.btn svg { width: 18px; height: 18px; }
.btn:hover { text-decoration: none; }
.btn--primary { background: var(--accent-dark); color: var(--white); box-shadow: var(--shadow-btn); }
.btn--primary:hover, .btn--primary.is-hover { background: color-mix(in srgb, var(--accent-dark) 80%, var(--accent)); color: var(--white); }
.btn--ghost { background: color-mix(in srgb, var(--bg-panel) 50%, transparent); color: var(--text); border-color: color-mix(in srgb, var(--mint) 40%, var(--border)); }
.btn--ghost:hover { border-color: var(--mint); }
.btn--ghost svg { width: 16px; height: 16px; color: var(--mint); }
.btn:active, .btn.is-pressed { transform: translateY(1px); }
.btn:disabled, .btn[aria-disabled="true"] { background: var(--bg-panel-2); color: var(--text-muted); border-color: var(--border); box-shadow: none; }
.btn.is-focus { outline: 2px solid var(--accent); outline-offset: 3px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }

.topbar { position: relative; z-index: 40; background: var(--nav-bg); color: var(--nav-ink); box-shadow: var(--shadow-nav); }
.topbar__in {
  position: relative;
  width: 100%;
  max-width: min(100%, calc(1344px + var(--gutter) * 2));
  margin-inline: auto;
  padding-inline: var(--gutter);
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: 40px;
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--nav-ink); flex-shrink: 0; text-decoration: none; }
.brand:hover { text-decoration: none; }
.brand__mark {
  display: block;
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  border-radius: var(--radius-mark);
}
.brand__mark--placeholder {
  border: 1.5px solid transparent;
  background: linear-gradient(var(--white), var(--white)) padding-box, linear-gradient(140deg, var(--accent-dark), var(--accent)) border-box;
  color: var(--nav-ink);
  box-shadow: 0 1px 3px color-mix(in srgb, var(--shadow-ink) 22%, transparent);
}
.brand__name { font-size: 16px; font-weight: var(--weight-strong); letter-spacing: -.015em; }
.desktop-nav { margin-left: auto; min-width: 0; }
.menu { display: flex; align-items: center; list-style: none; margin: 0; padding: 0; gap: 4px; }
.menu > li { position: relative; }
.menu a, .menu button, .menu summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 40px;
  padding: 0 14px;
  font: var(--weight-medium) 15px/1.2 var(--font-body);
  color: var(--nav-ink);
  background: transparent;
  border: 0;
  cursor: pointer;
  border-radius: var(--radius-btn);
  text-decoration: none;
  white-space: nowrap;
}
.menu summary { list-style: none; }
.menu summary::-webkit-details-marker { display: none; }
.menu a:hover, .menu button:hover, .menu summary:hover { background: color-mix(in srgb, var(--nav-ink) 5%, transparent); color: var(--nav-ink); }
.menu a[aria-current="page"] { color: var(--accent-dark); position: relative; }
.menu a[aria-current="page"]::after { content: ""; position: absolute; left: 14px; right: 14px; bottom: 4px; height: 2px; border-radius: var(--radius-pill); background: var(--accent); }
.menu svg, .caret { width: 10px; height: 10px; color: var(--nav-ink-muted); }
.submenu, .language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  min-width: 180px;
  list-style: none;
  margin: 0;
  padding: 6px;
  background: var(--nav-bg);
  color: var(--nav-ink);
  border: 1px solid var(--nav-line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-dropdown);
  z-index: 5;
}
.submenu a, .language-menu a { display: flex; align-items: center; width: 100%; min-height: 44px; padding: 10px 14px; color: var(--nav-ink); font-size: 14px; text-decoration: none; border-radius: var(--radius-btn); }
.language-menu a:hover { background: var(--nav-line); color: var(--nav-ink); }
.header-tools { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.lang { position: relative; flex-shrink: 0; }
.lang > button, .lang > details > summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 36px;
  padding: 8px 14px;
  font: var(--weight-medium) 14px/1.2 var(--font-body);
  color: var(--nav-ink);
  background: var(--nav-bg);
  border: 1px solid var(--nav-line);
  border-radius: var(--radius-pill);
  cursor: pointer;
  list-style: none;
  white-space: nowrap;
}
.lang summary::-webkit-details-marker { display: none; }
.lang svg { width: 15px; height: 15px; color: var(--nav-ink-muted); }
.lang .caret { width: 9px; height: 9px; }
.lang-short { display: none; }
.hamburger { display: none; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; padding: 10px; border: 1px solid var(--nav-line); border-radius: var(--radius-btn); background: var(--nav-bg); color: var(--nav-ink); }
.hamburger svg { width: 22px; height: 22px; }
.mobile-drawer { position: absolute; top: var(--header-height); left: 0; right: 0; max-height: calc(100dvh - var(--header-height)); overflow-y: auto; overscroll-behavior: contain; padding: 16px var(--gutter) 24px; border-top: 1px solid var(--nav-line); background: var(--nav-bg); color: var(--nav-ink); box-shadow: var(--shadow-dropdown); z-index: 6; }
.mobile-drawer ul { list-style: none; margin: 0; padding: 0; }
.mobile-drawer a { display: flex; align-items: center; width: 100%; min-height: 48px; padding: 12px 14px; color: var(--nav-ink); text-decoration: none; border-radius: var(--radius-btn); }
.mobile-drawer a:hover, .mobile-drawer a[aria-current] { background: var(--nav-line); color: var(--nav-ink); }
.mobile-drawer__languages { border-top: 1px solid var(--nav-line); margin-top: 16px; padding-top: 12px; }
.mobile-drawer__languages p { margin: 8px 14px; color: var(--nav-ink-muted); font-size: 13px; }
.nav-veil { position: fixed; inset: var(--header-height) 0 0; z-index: 30; border: 0; background: color-mix(in srgb, var(--shadow-ink) 65%, transparent); color: var(--white); }

.card, .panel {
  padding: 28px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-card);
  background: var(--bg-panel);
  color: var(--text);
}
.card { transition: transform var(--motion-soft), box-shadow var(--motion-soft); }
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.card h3, .panel h3 { margin-top: 0; }
.card p, .panel p { color: var(--text-muted); }
.card > :last-child, .panel > :last-child { margin-bottom: 0; }
.panel--raised { background: var(--bg-panel-2); color: var(--text); }
.prose { min-width: 0; line-height: 1.85; }
.prose h2 { margin-top: 64px; margin-bottom: 24px; }
.prose h3 { margin-top: 36px; }
.prose p, .prose ul, .prose ol { margin-block: 20px; }
.prose li + li { margin-top: 8px; }
.prose img { height: auto; }
.prose :not(pre) > code { font-size: .88em; color: var(--lavender); }
.prose blockquote { margin-inline: 0; }
.prose section { scroll-margin-top: 24px; }
.reveal { opacity: 1; transform: none; }
html.reveal-enabled .reveal { opacity: 0; transform: translateY(16px); transition: opacity .65s ease, transform .65s ease; }
html.reveal-enabled .reveal.shown { opacity: 1; transform: none; }

.site-footer { border-top: 1px solid var(--line-soft); padding-top: 64px; padding-bottom: 32px; background: var(--bg-deep); color: var(--text); }
.footer-grid { display: grid; grid-template-columns: 1.2fr .7fr 1.1fr .6fr; gap: 40px; }
.site-footer .brand { color: var(--text); }
.site-footer p { color: var(--text-muted); font-size: 14px; }
.footer-title { margin: 0 0 18px; font: var(--weight-medium) 15px/1.4 var(--font-body); }
.footer-links { list-style: none; margin: 0; padding: 0; }
.footer-links a { display: inline-block; padding-block: 6px; color: var(--text-muted); font-size: 14px; text-decoration: none; }
.footer-links a:hover { color: var(--accent); text-decoration: underline; }
.footer-bottom { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--line-soft); display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 24px; color: var(--text-muted); font-size: 13px; }
.footer-bottom p { margin: 0; font-size: inherit; }
.footer-bottom a { color: var(--text-muted); }

@media (max-width: 1279px) {
  .desktop-nav { display: none; }
  .header-tools { margin-left: auto; }
  .hamburger { display: inline-flex; }
}
@media (min-width: 1280px) {
  .mobile-drawer, .nav-veil { display: none !important; }
}
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-three { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  h1 { font-size: clamp(24px, 4vw, 30px); }
}
@media (max-width: 640px) {
  :root { --gutter: 16px; --section-space: 144px; }
  .topbar__in { gap: 12px; }
  .brand { gap: 8px; flex-shrink: 1; min-width: 0; }
  .brand__name { font-size: 14px; min-width: 0; overflow-wrap: anywhere; }
  .header-tools { gap: 6px; margin-left: auto; }
  .lang > button, .lang > details > summary { padding-inline: 10px; font-size: 13px; }
  .lang-full { display: none; }
  .lang-short { display: inline; }
  .lang .globe { display: none; }
  .grid-two, .footer-grid { grid-template-columns: 1fr; }
  .card, .panel { padding: 22px; }
  .tilt, [data-tilt] { transform: none !important; }
  .section__intro { margin-bottom: 28px; }
  .site-footer { padding-top: 48px; }
  .footer-grid { gap: 32px; }
  .btn { padding-inline: 18px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html.reveal-enabled .reveal { opacity: 1; transform: none; }
  .card:hover { transform: none; }
}