:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-soft: #f7f7f5;
  --surface-strong: #ededeb;
  --ink: #0d0d0d;
  --text: #2f2f2f;
  --muted: #6f6f6f;
  --faint: #929292;
  --line: rgba(13, 13, 13, 0.12);
  --line-strong: rgba(13, 13, 13, 0.22);
  --inverse: #0d0d0d;
  --inverse-text: #ffffff;
  --success: #08783e;
  --warning: #8b5d00;
  --danger: #b42318;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.07);
  --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.05);
  --radius-sm: 12px;
  --radius: 20px;
  --radius-lg: 30px;
  --page: 1120px;
  --reading: 760px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --nav-control: 38px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SF Mono", "SFMono-Regular", ui-monospace, Menlo, Monaco, Consolas, monospace;
  font-family: var(--font);
}

html[data-theme="dark"] {
  --bg: #171717;
  --surface: #202020;
  --surface-soft: #242424;
  --surface-strong: #303030;
  --ink: #f5f5f5;
  --text: #dfdfdf;
  --muted: #a6a6a6;
  --faint: #858585;
  --line: rgba(255, 255, 255, 0.12);
  --line-strong: rgba(255, 255, 255, 0.22);
  --inverse: #f5f5f5;
  --inverse-text: #111111;
  --success: #52bd7a;
  --warning: #e0aa52;
  --danger: #ff8b82;
  --shadow: 0 20px 55px rgba(0, 0, 0, 0.32);
  --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.24);
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    --bg: #171717;
    --surface: #202020;
    --surface-soft: #242424;
    --surface-strong: #303030;
    --ink: #f5f5f5;
    --text: #dfdfdf;
    --muted: #a6a6a6;
    --faint: #858585;
    --line: rgba(255, 255, 255, 0.12);
    --line-strong: rgba(255, 255, 255, 0.22);
    --inverse: #f5f5f5;
    --inverse-text: #111111;
    --success: #52bd7a;
    --warning: #e0aa52;
    --danger: #ff8b82;
    --shadow: 0 20px 55px rgba(0, 0, 0, 0.32);
    --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.24);
  }
}

* { box-sizing: border-box; }

html {
  min-height: 100%;
  background: var(--bg);
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color 280ms var(--ease), color 280ms var(--ease);
}

body::before {
  content: "";
  position: fixed;
  inset: 0 0 auto;
  height: 340px;
  z-index: 0;
  pointer-events: none;
  background: radial-gradient(70% 90% at 50% -20%, rgba(127, 127, 127, 0.12), transparent 72%);
}

::selection { background: var(--ink); color: var(--bg); }

a { color: inherit; text-decoration: none; }
button, input, textarea, select { color: inherit; font: inherit; }
button { cursor: pointer; }
img, svg { display: block; max-width: 100%; }

.skip-link {
  position: fixed;
  left: 16px;
  top: 12px;
  z-index: 100;
  transform: translateY(-150%);
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--inverse);
  color: var(--inverse-text);
}
.skip-link:focus { transform: none; }

.page { min-height: 100vh; min-height: 100dvh; display: flex; flex-direction: column; }
.shell { width: min(var(--page), calc(100% - 40px)); margin-inline: auto; }
.reading { width: min(var(--reading), 100%); margin-inline: auto; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  transition: box-shadow 180ms ease, background 180ms ease;
}
.site-header.is-scrolled { box-shadow: 0 1px 0 var(--line), 0 8px 26px rgba(0, 0, 0, .04); }

.nav {
  width: min(var(--page), calc(100% - 32px));
  min-height: 62px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; font-size: 17px; font-weight: 650; letter-spacing: -.02em; }
.brand-mark { width: 28px; height: 28px; border-radius: 8px; }

.nav-links { position: relative; display: flex; align-items: center; gap: 3px; margin-left: auto; }
.nav-active-pill {
  position: absolute;
  z-index: 0;
  top: 0;
  left: 0;
  height: var(--nav-control);
  border-radius: 999px;
  background: var(--surface-soft);
  pointer-events: none;
  opacity: 0;
  transform: translateX(var(--pill-x, 0));
  width: var(--pill-width, 0);
  transition: width 300ms var(--ease), transform 340ms var(--ease), opacity 180ms ease, background-color 280ms var(--ease);
}
.nav-links.has-active-pill .nav-active-pill { opacity: 1; }
.nav-link {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: var(--nav-control);
  min-height: var(--nav-control);
  padding: 0 12px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 520;
  transition: background 180ms ease, color 180ms ease, transform 180ms var(--ease);
}
.nav-link:hover, .nav-link[aria-current="page"] { color: var(--ink); background: var(--surface-soft); }
.nav-links.has-active-pill .nav-link:hover,
.nav-links.has-active-pill .nav-link[aria-current="page"] { background: transparent; }
.nav-link:active { transform: scale(.96); }
.nav-external::after { content: "↗"; margin-left: 5px; font-size: 11px; opacity: .62; }
.nav-download {
  height: var(--nav-control);
  min-height: var(--nav-control);
  margin-left: 6px;
  padding-inline: 15px;
  font-size: 14px;
}

.nav-actions { display: flex; align-items: center; gap: 6px; }
.icon-button, .menu-button {
  width: var(--nav-control);
  height: var(--nav-control);
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  transition: transform 180ms var(--ease), background 180ms ease, border-color 180ms ease;
}
.icon-button:hover, .menu-button:hover { background: var(--surface-soft); border-color: var(--line-strong); }
.icon-button:active, .menu-button:active { transform: scale(.92); }
.icon-button svg, .menu-button svg { width: 16px; height: 16px; stroke-width: 1.8; }
.menu-button { display: none; }
.menu-glyph { position: relative; width: 17px; height: 14px; display: block; }
.menu-line { position: absolute; left: 0; width: 17px; height: 1.5px; border-radius: 999px; background: currentColor; transition: transform 320ms var(--ease), opacity 180ms ease, top 320ms var(--ease); }
.menu-line:nth-child(1) { top: 1px; }
.menu-line:nth-child(2) { top: 6px; }
.menu-line:nth-child(3) { top: 11px; }
.menu-button[aria-expanded="true"] .menu-line:nth-child(1) { top: 6px; transform: rotate(45deg); }
.menu-button[aria-expanded="true"] .menu-line:nth-child(2) { opacity: 0; transform: scaleX(.3); }
.menu-button[aria-expanded="true"] .menu-line:nth-child(3) { top: 6px; transform: rotate(-45deg); }
.nav-backdrop {
  position: fixed;
  inset: 58px 0 0;
  z-index: 40;
  border: 0;
  background: rgba(0, 0, 0, .18);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  transition: opacity 220ms ease, visibility 220ms ease;
}
body.nav-is-open .nav-backdrop { opacity: 1; visibility: visible; pointer-events: auto; }

.language-toggle {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: inline-grid;
  grid-template-columns: 1fr 1fr;
  width: 78px;
  height: var(--nav-control);
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
}
.language-toggle::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: 3px;
  bottom: 3px;
  left: 3px;
  width: calc((100% - 6px) / 2);
  border-radius: 999px;
  background: var(--inverse);
  box-shadow: 0 1px 3px rgba(0, 0, 0, .12);
  transform: translateX(0);
  transition: transform 320ms var(--ease), background-color 280ms var(--ease), box-shadow 280ms var(--ease);
}
html[data-lang="en"] .language-toggle::before { transform: translateX(100%); }
.language-toggle button { position: relative; z-index: 1; border: 0; border-radius: 999px; background: transparent; color: var(--muted); font-size: 11px; font-weight: 700; transition: color 220ms ease, transform 180ms var(--ease); }
.language-toggle button:hover:not([aria-pressed="true"]) { color: var(--ink); }
.language-toggle button:active { transform: scale(.92); }
.language-toggle button[aria-pressed="true"] { color: var(--inverse-text); background: transparent; }
html.is-language-switching .language-toggle { pointer-events: none; }

.icon-button .theme-icon {
  grid-area: 1 / 1;
  transition: opacity 220ms ease, transform 360ms var(--ease);
}
.icon-button .theme-icon-sun { opacity: 0; transform: rotate(-70deg) scale(.55); }
html[data-theme="dark"] .icon-button .theme-icon-moon { opacity: 0; transform: rotate(70deg) scale(.55); }
html[data-theme="dark"] .icon-button .theme-icon-sun { opacity: 1; transform: rotate(0) scale(1); }

.site-header, .feature-card, .link-card, .quick-start-card, .support-card, .invite-card,
.button, .icon-button, .menu-button, .language-toggle, .command-box, .command-copy,
.toc a, .notice, .modal {
  transition-property: background-color, color, border-color, box-shadow, transform, opacity;
  transition-duration: 280ms;
  transition-timing-function: var(--ease);
}

.main { flex: 1; }
.hero { padding: clamp(60px, 7.5vw, 96px) 0 clamp(50px, 6.5vw, 78px); }
.hero.compact { padding-block: clamp(50px, 6vw, 72px) clamp(42px, 5vw, 60px); }
.hero-center { max-width: var(--page); margin-inline: auto; text-align: left; }
.document-hero .hero-center { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: clamp(40px, 7vw, 88px); }
.document-hero .hero-copy { grid-column: 2; max-width: 780px; }
.kicker { margin: 0 0 18px; color: var(--muted); font-size: 14px; font-weight: 650; letter-spacing: .08em; text-transform: uppercase; }
.display { margin: 0; color: var(--ink); font-size: clamp(42px, 6.8vw, 78px); line-height: 1.04; letter-spacing: -.052em; font-weight: 620; }
.display.medium { font-size: clamp(38px, 5.2vw, 62px); }
.display.small { font-size: clamp(34px, 4.4vw, 52px); }
.title-line { display: block; }
.lede { max-width: 720px; margin: 26px 0 0; color: var(--muted); font-size: clamp(18px, 2vw, 22px); line-height: 1.62; letter-spacing: -.015em; }
.hero-meta { margin-top: 22px; color: var(--faint); font-size: 14px; }
.hero-center .button-row { justify-content: flex-start; }

.button-row { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 34px; }
.button {
  min-height: 48px;
  padding: 0 21px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  background: var(--surface);
  color: var(--ink);
  font-size: 15px;
  font-weight: 630;
  text-align: center;
  transition: transform 220ms var(--ease), background 180ms ease, border-color 180ms ease;
}
.button:hover { transform: translateY(-2px); border-color: var(--ink); }
.button:active { transform: translateY(0) scale(.97); }
.button.primary { background: var(--inverse); color: var(--inverse-text); border-color: var(--inverse); }
.button.primary:hover { opacity: .9; }
.button.quiet { border-color: transparent; background: var(--surface-soft); }
.button svg { width: 18px; height: 18px; stroke-width: 1.8; }
.button[disabled] { opacity: .48; pointer-events: none; }
.nav .nav-download { height: var(--nav-control); min-height: var(--nav-control); }

.quick-start { padding: 0 0 clamp(56px, 8vw, 92px); }
.quick-start-head { max-width: 720px; margin-bottom: 28px; }
.quick-start-head .section-label { margin: 0 0 12px; }
.quick-start-head h2 { max-width: 620px; margin: 0; color: var(--ink); font-size: clamp(26px, 3.2vw, 40px); line-height: 1.12; letter-spacing: -.04em; font-weight: 620; text-align: left; }
.quick-start-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.quick-start-card {
  min-height: 330px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 28px;
  transition: transform 240ms var(--ease), border-color 180ms ease, box-shadow 240ms var(--ease), background 180ms ease;
}
a.quick-start-card:hover { transform: translateY(-3px); border-color: var(--line-strong); box-shadow: var(--shadow-soft); }
a.quick-start-card:active { transform: translateY(0) scale(.985); }
.quick-start-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.quick-start-index { color: var(--faint); font-family: var(--mono); font-size: 12px; }
.quick-start-tag { min-height: 28px; padding: 0 10px; border-radius: 999px; background: var(--surface-soft); color: var(--muted); display: inline-flex; align-items: center; font-size: 11px; font-weight: 680; letter-spacing: .03em; }
.quick-start-card h3 { margin: 0 0 10px; color: var(--ink); font-size: 22px; line-height: 1.18; letter-spacing: -.03em; }
.quick-start-card p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.65; }
.command-box { min-width: 0; padding: 10px 10px 10px 14px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface-soft); display: grid; grid-template-columns: minmax(0, 1fr) 36px; align-items: center; gap: 8px; }
.command-box code { overflow: hidden; color: var(--text); font-family: var(--mono); font-size: 11px; line-height: 1.45; text-overflow: ellipsis; white-space: nowrap; }
.command-copy { width: 36px; height: 36px; border: 0; border-radius: 10px; background: var(--surface); color: var(--muted); display: grid; place-items: center; transition: transform 180ms var(--ease), color 180ms ease, background 180ms ease; }
.command-copy:hover { color: var(--ink); background: var(--bg); }
.command-copy:active { transform: scale(.9); }
.command-copy svg { width: 17px; height: 17px; stroke-width: 1.7; }
.text-link, .card-action { min-height: 28px; color: var(--ink); display: inline-flex; align-items: center; justify-content: space-between; gap: 12px; font-size: 13px; font-weight: 650; }
.text-link { width: 100%; }
.text-link span:last-child, .card-action span:last-child, .link-card .arrow { transition: transform 200ms var(--ease); }
.text-link:hover span:last-child { transform: translateX(4px); }
a.quick-start-card:hover .card-action span:last-child, a.link-card:hover .arrow { transform: translate(3px, -3px); }

.section { padding: clamp(56px, 8vw, 96px) 0; border-top: 1px solid var(--line); }
.section.soft { background: var(--surface-soft); }
.section-head { max-width: 720px; margin-bottom: 38px; }
.section-head.center { text-align: left; margin-inline: 0; }
.section-label { margin: 0 0 12px; color: var(--muted); font-size: 13px; font-weight: 680; letter-spacing: .09em; text-transform: uppercase; }
.section-title { margin: 0; color: var(--ink); font-size: clamp(30px, 3.6vw, 46px); line-height: 1.14; letter-spacing: -.04em; font-weight: 620; }
.section-copy { margin: 18px 0 0; color: var(--muted); font-size: 18px; line-height: 1.7; }

.feature-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
.feature-card, .link-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 26px;
  transition: transform 260ms var(--ease), border-color 180ms ease, box-shadow 260ms ease;
}
.feature-card:hover, a.link-card:hover { transform: translateY(-3px); border-color: var(--line-strong); box-shadow: var(--shadow-soft); }
.card-icon { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 13px; background: var(--surface-soft); color: var(--ink); }
.card-icon svg { width: 21px; height: 21px; stroke-width: 1.7; }
.feature-card h3, .link-card h3 { margin: 38px 0 10px; color: var(--ink); font-size: 20px; letter-spacing: -.025em; }
.feature-card p, .link-card p { margin: 0; color: var(--muted); line-height: 1.65; }
.feature-index { display: inline-flex; color: var(--faint); font-family: var(--mono); font-size: 12px; letter-spacing: .04em; }
.feature-index + h3 { margin-top: 30px; }

.link-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.link-card { display: grid; grid-template-columns: 1fr auto; gap: 20px; align-items: end; min-height: 190px; }
.link-card h3 { margin-top: 0; }
.link-card .arrow { color: var(--muted); font-size: 28px; line-height: 1; }
.link-card.wide { grid-column: 1 / -1; min-height: 160px; }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); border-block: 1px solid var(--line); }
.stat { padding: 28px 18px; text-align: center; border-right: 1px solid var(--line); }
.stat:last-child { border-right: 0; }
.stat strong { display: block; color: var(--ink); font-size: clamp(25px, 3vw, 38px); letter-spacing: -.04em; }
.stat span { display: block; margin-top: 5px; color: var(--muted); font-size: 13px; }

.document-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: clamp(40px, 7vw, 88px); align-items: start; padding-bottom: 96px; }
.toc { position: sticky; top: 92px; padding-top: 8px; }
.toc-title { margin: 0 0 14px; color: var(--ink); font-size: 13px; font-weight: 680; }
.toc a { display: block; padding: 7px 0; color: var(--muted); font-size: 13px; line-height: 1.35; }
.toc a:hover { color: var(--ink); }

.article { min-width: 0; max-width: 780px; }
.article-section { padding: 36px 0; border-top: 1px solid var(--line); }
.article-section:first-child { padding-top: 0; border-top: 0; }
.article h2 { margin: 0 0 18px; color: var(--ink); font-size: clamp(25px, 3vw, 34px); line-height: 1.18; letter-spacing: -.035em; }
.article h3 { margin: 28px 0 10px; color: var(--ink); font-size: 18px; line-height: 1.35; }
.article p, .article li { color: var(--text); font-size: 16px; line-height: 1.82; }
.article p { margin: 12px 0; }
.article ul, .article ol { margin: 14px 0; padding-left: 1.35em; }
.article li + li { margin-top: 8px; }
.article a:not(.button) { color: var(--ink); text-decoration: underline; text-decoration-color: var(--line-strong); text-underline-offset: 4px; }
.article strong { color: var(--ink); font-weight: 650; }
.article code { font-family: var(--mono); font-size: .9em; padding: .1em .35em; border-radius: 6px; background: var(--surface-soft); }

.notice { margin: 24px 0; padding: 18px 20px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: var(--surface-soft); }
.notice strong { display: block; margin-bottom: 5px; }
.notice p { margin: 0; color: var(--muted); }
.notice.warning { border-color: color-mix(in srgb, var(--warning) 40%, var(--line)); }
.notice.danger { border-color: color-mix(in srgb, var(--danger) 40%, var(--line)); }

.info-list { display: grid; border-top: 1px solid var(--line); }
.info-row { display: grid; grid-template-columns: minmax(140px, .8fr) minmax(0, 1.7fr); gap: 28px; padding: 19px 0; border-bottom: 1px solid var(--line); }
.info-row strong { color: var(--ink); }
.info-row span { color: var(--muted); line-height: 1.6; }

.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { list-style: none; padding: 22px 42px 22px 0; color: var(--ink); font-weight: 620; cursor: pointer; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; top: 19px; font-size: 22px; color: var(--muted); transition: transform 200ms ease; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details > div { padding: 0 0 22px; color: var(--muted); line-height: 1.75; }

.step-list { display: grid; gap: 0; border-top: 1px solid var(--line); }
.step { display: grid; grid-template-columns: 42px 1fr; gap: 16px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.step-number { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 999px; background: var(--inverse); color: var(--inverse-text); font-size: 13px; font-weight: 700; }
.step strong { display: block; color: var(--ink); }
.step span { display: block; margin-top: 5px; color: var(--muted); line-height: 1.55; }

.support-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.support-card { min-height: 220px; display: flex; flex-direction: column; padding: 24px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); transition: transform 260ms var(--ease), border-color 180ms ease, box-shadow 260ms ease, background-color 280ms var(--ease); }
a.support-card:hover { transform: translateY(-3px); border-color: var(--line-strong); box-shadow: var(--shadow-soft); }
a.support-card:active { transform: translateY(0) scale(.985); }
.support-card h3 { margin: 28px 0 8px; color: var(--ink); font-size: 19px; }
.support-card p { margin: 0; color: var(--muted); line-height: 1.6; }
.support-card .card-action { margin-top: auto; padding-top: 22px; color: var(--ink); font-size: 14px; font-weight: 650; }

.invite-wrap { max-width: 980px; margin-inline: auto; }
.invite-page .main { display: flex; align-items: center; }
.invite-page .hero { width: 100%; padding-block: clamp(34px, 6vw, 72px); }
.invite-kicker { margin: 0; color: var(--muted); font-size: 14px; font-weight: 650; }
.invite-summary { margin: 0; color: var(--muted); font-size: 16px; line-height: 1.62; }
.invite-text-links { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-top: 18px; color: var(--muted); font-size: 13px; }
.invite-text-links a, .invite-text-links button { padding: 0; border: 0; background: transparent; color: inherit; text-decoration: underline; text-decoration-color: var(--line-strong); text-underline-offset: 4px; }
.invite-card { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr); border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden; background: var(--surface); box-shadow: var(--shadow); }
.invite-primary, .invite-secondary { padding: clamp(28px, 5vw, 54px); }
.invite-secondary { border-left: 1px solid var(--line); background: var(--surface-soft); }
.invite-code { margin: 30px 0 18px; color: var(--ink); font-family: var(--mono); font-size: clamp(46px, 7vw, 76px); font-weight: 540; letter-spacing: .12em; line-height: 1; overflow-wrap: anywhere; }
.invite-code.is-empty { font-family: var(--font); font-size: clamp(38px, 5vw, 58px); letter-spacing: -.045em; }
.invite-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; margin-top: 30px; }
.invite-actions .button { width: 100%; }
.invite-actions .button span { white-space: nowrap; }
.invite-actions .button svg { flex: 0 0 auto; }
.mini-title { margin: 0 0 18px; color: var(--ink); font-size: 20px; letter-spacing: -.025em; }
.compact-list { display: grid; gap: 14px; }
.compact-item { display: grid; grid-template-columns: 28px 1fr; gap: 12px; align-items: start; }
.compact-item .dot { width: 24px; height: 24px; display: grid; place-items: center; border: 1px solid var(--line-strong); border-radius: 999px; color: var(--muted); font-size: 11px; font-weight: 700; }
.compact-item strong { display: block; color: var(--ink); font-size: 14px; }
.compact-item span { display: block; margin-top: 3px; color: var(--muted); font-size: 13px; line-height: 1.45; }

.cta-band { padding: clamp(56px, 9vw, 96px) 0; text-align: center; }
.cta-band .section-title { max-width: 760px; margin-inline: auto; }
.cta-band .button-row { justify-content: center; }

.site-footer { border-top: 1px solid var(--line); padding: 44px 0 max(34px, env(safe-area-inset-bottom)); }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 32px; }
.footer-brand p { max-width: 300px; margin: 14px 0 0; color: var(--muted); font-size: 13px; line-height: 1.65; }
.footer-col strong { display: block; margin-bottom: 12px; color: var(--ink); font-size: 13px; }
.footer-col a { display: block; width: fit-content; margin: 8px 0; color: var(--muted); font-size: 13px; }
.footer-col a:hover { color: var(--ink); }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; margin-top: 38px; padding-top: 20px; border-top: 1px solid var(--line); color: var(--faint); font-size: 12px; }

.toast { position: fixed; left: 50%; bottom: max(24px, env(safe-area-inset-bottom)); z-index: 100; transform: translate(-50%, 20px); opacity: 0; pointer-events: none; padding: 11px 16px; border-radius: 999px; background: var(--inverse); color: var(--inverse-text); font-size: 13px; box-shadow: var(--shadow); transition: opacity 180ms ease, transform 240ms var(--ease); }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

.modal-backdrop { position: fixed; inset: 0; z-index: 90; display: grid; place-items: end center; padding: 20px; background: rgba(0, 0, 0, .42); backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); }
.modal-backdrop[hidden] { display: none; }
.modal { width: min(520px, 100%); padding: 24px; border-radius: 26px; background: var(--surface); box-shadow: 0 24px 80px rgba(0, 0, 0, .28); }
.modal h2 { margin: 0; color: var(--ink); font-size: 23px; letter-spacing: -.03em; }
.modal p { margin: 10px 0 22px; color: var(--muted); line-height: 1.6; }
.modal-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.modal-actions .button { width: 100%; }

.error-code { font-family: var(--mono); font-size: clamp(80px, 17vw, 180px); color: var(--ink); letter-spacing: -.08em; line-height: .8; }

.motion-ready .enter { animation: enter 620ms var(--ease) both; animation-delay: var(--delay, 0ms); }
@keyframes enter { from { transform: translateY(8px); } to { transform: none; } }

:focus-visible { outline: 2px solid var(--ink); outline-offset: 3px; }
.icon-button:focus-visible, .menu-button:focus-visible, .language-toggle button:focus-visible { outline: 0; box-shadow: 0 0 0 3px color-mix(in srgb, var(--ink) 18%, transparent); }

@media (max-width: 920px) {
  .feature-grid, .support-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .quick-start-grid { grid-template-columns: 1fr 1fr; }
  .skill-card { grid-column: 1 / -1; min-height: 280px; }
  .invite-card { grid-template-columns: 1fr; }
  .invite-secondary { border-left: 0; border-top: 1px solid var(--line); }
  .footer-grid { grid-template-columns: 1.3fr repeat(2, 1fr); }
  .footer-col:last-of-type { grid-column: 2; }
}

@media (max-width: 780px) {
  .shell { width: min(100% - 28px, var(--page)); }
  .nav { width: calc(100% - 24px); min-height: 58px; }
  .brand span { font-size: 16px; }
  .nav-actions { margin-left: auto; }
  .nav-links {
    position: absolute;
    left: 12px;
    right: 12px;
    top: calc(100% + 8px);
    display: flex;
    margin: 0;
    padding: 8px;
    flex-direction: column;
    align-items: stretch;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: var(--surface);
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-8px) scale(.985);
    transform-origin: top center;
    transition: opacity 200ms ease, transform 260ms var(--ease), visibility 200ms ease, background-color 280ms var(--ease), border-color 280ms var(--ease);
  }
  .nav-links[data-open="true"] { opacity: 1; visibility: visible; pointer-events: auto; transform: none; }
  .nav-active-pill { display: none; }
  .nav-links.has-active-pill .nav-link[aria-current="page"] { background: var(--surface-soft); }
  .nav-link { width: 100%; height: 44px; min-height: 44px; padding-inline: 14px; justify-content: flex-start; }
  .nav .nav-download { width: 100%; height: 44px; min-height: 44px; margin: 4px 0 0; }
  .menu-button { display: inline-grid; }
  .language-toggle { width: 70px; }
  body.nav-is-open { overflow: hidden; }
  .hero { padding-block: 48px 48px; }
  .hero.compact { padding-block: 42px 38px; }
  .document-hero .hero-center { display: block; }
  .quick-start-head .section-label { margin-bottom: 10px; }
  .display { font-size: clamp(38px, 11vw, 50px); line-height: 1.1; letter-spacing: -.045em; }
  .display.medium { font-size: clamp(36px, 10.5vw, 46px); }
  .display.small { font-size: clamp(34px, 9.5vw, 42px); }
  .about-hero .display { font-size: clamp(30px, 8.7vw, 34px); line-height: 1.12; }
  .section-title { font-size: clamp(28px, 8.5vw, 38px); line-height: 1.18; letter-spacing: -.035em; }
  .lede { font-size: 17px; }
  .feature-grid, .support-grid, .link-grid { grid-template-columns: 1fr; }
  .quick-start-grid { grid-template-columns: 1fr; }
  .skill-card { grid-column: auto; }
  .link-card.wide { grid-column: auto; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .document-layout { grid-template-columns: 1fr; gap: 24px; padding-bottom: 70px; }
  .toc { position: static; display: flex; gap: 6px; overflow-x: auto; padding: 0 0 10px; scrollbar-width: none; }
  .toc::-webkit-scrollbar { display: none; }
  .toc-title { display: none; }
  .toc a { flex: 0 0 auto; padding: 8px 12px; border: 1px solid var(--line); border-radius: 999px; background: var(--surface); }
  .info-row { grid-template-columns: 1fr; gap: 7px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-col:last-of-type { grid-column: auto; }
  .invite-actions, .modal-actions { grid-template-columns: 1fr; }
  .invite-code { font-size: clamp(42px, 15vw, 64px); }
  .invite-page .site-footer { display: none; }
  .invite-page .main { display: block; }
  .invite-page .hero { padding-block: 16px 24px; }
  .invite-page .invite-primary { padding: 20px 22px; }
  .invite-page .invite-secondary { display: block; padding: 18px 22px; }
  .invite-page .invite-card { border-radius: 24px; box-shadow: none; }
  .invite-page .invite-code { margin-block: 16px 10px; font-size: clamp(44px, 14vw, 56px); }
  .invite-page .invite-summary { font-size: 15px; line-height: 1.48; }
  .invite-page .invite-actions { grid-template-columns: 1fr 1fr; }
  .invite-page .invite-actions { margin-top: 18px; }
  .invite-page .button { min-height: 44px; padding-inline: 12px; gap: 5px; font-size: 13px; }
  .invite-page .button svg { width: 15px; height: 15px; }
  .invite-page .invite-text-links { margin-top: 12px; gap: 6px 13px; font-size: 12px; }
  .invite-page .mini-title { margin-bottom: 12px; font-size: 18px; }
  .invite-page .compact-list { gap: 8px; }
  .invite-page .compact-item { grid-template-columns: 24px 1fr; gap: 10px; }
  .invite-page .compact-item .dot { width: 22px; height: 22px; }
  .invite-page .compact-item strong { font-size: 13px; }
  .invite-page .compact-item span { margin-top: 1px; font-size: 12px; line-height: 1.35; }
  .invite-page .notice { margin-top: 14px; padding: 12px 14px; }
  .invite-page .notice strong { font-size: 13px; }
  .invite-page .notice p { font-size: 12px; line-height: 1.45; }
}

@media (max-width: 520px) {
  .nav-actions { gap: 4px; }
  .button-row { display: grid; grid-template-columns: 1fr; }
  .button-row .button { width: 100%; }
  .feature-grid, .support-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-col:last-of-type { grid-column: auto; }
  .footer-bottom { flex-direction: column; }
  .link-card { min-height: 160px; padding: 22px; }
  .quick-start-grid { grid-template-columns: 1fr; }
  .skill-card { grid-column: auto; }
  .quick-start-card { min-height: 290px; padding: 22px; }
  .invite-page .invite-actions { grid-template-columns: 1fr 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}

@media print {
  :root { --bg: #fff; --surface: #fff; --surface-soft: #fff; --ink: #000; --text: #111; --muted: #444; --line: #ccc; }
  .site-header, .site-footer, .toc, .button-row, .modal-backdrop, .toast { display: none !important; }
  .shell { width: 100%; }
  .hero.compact { padding: 24px 0 36px; }
  .document-layout { display: block; padding: 0; }
  .article { max-width: none; }
  .article-section { break-inside: avoid; }
  a { text-decoration: none !important; }
}