:root {
  --bg: #f7f6f3;
  --paper: #fff;
  --ink: #1c1b19;
  --muted: #5e5a53;
  --line: #e3dfd6;
  --link: #1e4b8c;
  --note: #f3efe4;
  --font: "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.75;
  overflow-x: clip;
}

body.nav-open { overflow: hidden; }

a { color: var(--link); }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.92em;
  background: var(--bg);
  padding: 0.1em 0.35em;
  overflow-wrap: anywhere;
}

img,
video {
  max-width: 100%;
  height: auto;
}

.skip {
  position: absolute;
  left: 12px;
  top: 0;
  z-index: 20;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  background: var(--ink);
  color: #fff;
}

.skip:focus {
  width: auto;
  height: auto;
  clip: auto;
  top: 12px;
  padding: 8px 12px;
  overflow: visible;
}

.top {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 56px;
  padding: env(safe-area-inset-top) max(28px, env(safe-area-inset-right)) 0 max(28px, env(safe-area-inset-left));
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(10px);
}

.nav-toggle {
  display: none;
  min-height: 36px;
  padding: 6px 12px;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}

.logo {
  color: inherit;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.logo span {
  margin-left: 8px;
  font-weight: 400;
  color: var(--muted);
}

.top nav {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-left: auto;
}

.top nav a {
  color: var(--muted);
  text-decoration: none;
}

.top nav a:hover,
.top nav a[aria-current="page"] { color: var(--ink); }

.top-buy {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border: 1px solid var(--ink);
  color: var(--ink);
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;
}

.lang { position: relative; }

.lang-btn {
  min-height: 32px;
  padding: 6px 12px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}

.lang-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 20;
  min-width: 148px;
  margin: 0;
  padding: 6px 0;
  list-style: none;
  border: 1px solid var(--line);
  background: var(--bg);
}

.lang-menu a {
  display: block;
  padding: 8px 14px;
  color: var(--muted);
  text-decoration: none;
}

.lang-menu a:hover,
.lang-menu a[aria-current="true"] { color: var(--ink); }

.foot-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.foot-note { margin: 0; }

.foot-langs {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 16px;
  margin: 0;
}

.foot-langs a {
  color: var(--muted);
  text-decoration: none;
}

.foot-langs a:hover,
.foot-langs a[aria-current="true"] { color: var(--ink); }

.layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 760px);
  gap: 48px;
  justify-content: center;
  max-width: 1120px;
  margin: 0 auto;
  padding: 36px 24px 80px;
}

.toc {
  position: sticky;
  top: 84px;
  align-self: start;
  font-size: 14px;
}

.toc p {
  margin: 0 0 10px;
  color: var(--muted);
}

.toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.toc a {
  display: block;
  padding: 5px 0;
  color: var(--muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: 10px;
}

.toc a:hover,
.toc a.is-active {
  color: var(--ink);
  border-left-color: var(--ink);
}

.doc section + section {
  margin-top: 48px;
  padding-top: 48px;
  border-top: 1px solid var(--line);
}

.kicker {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 13px;
}

h1 {
  margin: 0 0 20px;
  font-size: 34px;
  font-weight: 700;
  line-height: 1.3;
}

h2 {
  margin: 0 0 16px;
  font-size: 24px;
  font-weight: 700;
}

h3 {
  margin: 28px 0 10px;
  font-size: 18px;
  font-weight: 700;
}

.doc { overflow-wrap: break-word; }

.doc p { margin: 0 0 14px; }

.doc a { overflow-wrap: anywhere; }

.doc ul {
  margin: 0 0 16px;
  padding-left: 1.2em;
}

.doc li { margin: 6px 0; }

.facts {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 16px;
  margin: 24px 0 8px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.facts span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.facts b {
  display: block;
  margin-top: 4px;
  font-weight: 500;
}

.store {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  margin: 4px 0 12px;
  padding: 10px 16px;
  background: var(--ink);
  color: #fff;
  text-decoration: none;
}

.steps {
  margin: 0 0 16px;
  padding-left: 1.3em;
}

.steps li { margin: 10px 0; }

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 8px 0 20px;
}

.table-scroll table { margin: 0; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 20px;
  font-size: 15px;
}

th, td {
  padding: 10px 8px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-weight: 500;
}

.note {
  margin: 16px 0;
  padding: 12px 14px;
  background: var(--note);
}

.note p { margin: 0; }

dl { margin: 0; }

dt {
  margin-top: 20px;
  font-weight: 700;
}

dd {
  margin: 6px 0 0;
  color: var(--ink);
}

.end,
.home-end {
  max-width: none;
  width: 100%;
  margin: 72px 0 0;
  padding: 40px max(24px, env(safe-area-inset-right)) max(32px, env(safe-area-inset-bottom)) max(24px, env(safe-area-inset-left));
  border-top: 1px solid var(--line);
  background: #efece6;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.foot-inner {
  max-width: 760px;
  margin: 0 auto;
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.7fr 1fr 0.95fr;
  gap: 28px 24px;
}

@media (max-width: 960px) {
  .foot-grid { grid-template-columns: 1fr 1fr; }
}

.foot-brand strong {
  display: block;
  margin-bottom: 8px;
  color: var(--ink);
  font-size: 16px;
}

.foot-brand p,
.foot-grid p {
  margin: 0;
}

.foot-grid h2 {
  margin: 0 0 10px;
  font-size: 13px;
  font-weight: 700;
  color: var(--ink);
}

.foot-grid ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.foot-grid li { margin: 6px 0; }

.foot-grid a {
  color: var(--muted);
  text-decoration: none;
}

.foot-grid a:hover { color: var(--ink); }


.home {
  max-width: 760px;
  margin: 0 auto;
  padding: 56px max(24px, env(safe-area-inset-right)) 24px max(24px, env(safe-area-inset-left));
}

.home .hero { padding-bottom: 8px; }

.home h1 {
  margin: 0 0 16px;
  font-size: 48px;
  letter-spacing: 0.04em;
}

.lead {
  margin: 0 0 24px;
  font-size: 18px;
  color: var(--ink);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin: 0 0 8px;
}

.text-link {
  color: var(--ink);
  font-weight: 500;
}

.home .facts {
  grid-template-columns: 1fr 1fr 1fr;
}

.home .facts dt {
  margin: 0;
  font-weight: 400;
  color: var(--muted);
  font-size: 13px;
}

.home .facts dd { margin: 4px 0 0; }

.home section + section {
  margin-top: 48px;
  padding-top: 48px;
  border-top: 1px solid var(--line);
}

.home h2 {
  margin: 0 0 14px;
  font-size: 22px;
}

.home h3 {
  margin: 0 0 6px;
  font-size: 16px;
}

.feature-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px 32px;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.feature-list p {
  margin: 0;
  color: var(--muted);
}

.feature-list h3 a {
  color: inherit;
  text-decoration: none;
}

.feature-list h3 a:hover { color: var(--link); }

.home-end { /* filled by shared footer */ }

.guides {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px max(24px, env(safe-area-inset-right)) 24px max(24px, env(safe-area-inset-left));
}

.guides .lead { margin-bottom: 12px; }

.guide-group {
  margin-top: 40px;
}

.guide-group h2 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 500;
  color: var(--muted);
}

.guide-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.guide-list a {
  display: grid;
  grid-template-columns: 2.2em 1fr auto;
  gap: 12px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  color: inherit;
  text-decoration: none;
}

.guide-list a:hover .guide-title { color: var(--link); }

.guide-no {
  color: var(--muted);
  font-size: 13px;
}

.guide-title {
  font-weight: 700;
}

.guide-list a > div { min-width: 0; }

.guide-list p {
  grid-column: 2;
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.guide-list small {
  color: var(--muted);
  font-size: 13px;
}

.article {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px max(24px, env(safe-area-inset-right)) 24px max(24px, env(safe-area-inset-left));
}

.crumb {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 14px;
}

.crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  margin: 0;
  padding: 0;
  list-style: none;
}

.crumb li:not(:last-child)::after {
  content: "/";
  margin: 0 0.5em;
  color: var(--line);
}

.crumb a {
  color: var(--muted);
  text-decoration: none;
}

.crumb a:hover { color: var(--ink); }

.crumb [aria-current="page"] { color: var(--ink); }

.dl-card {
  margin: 40px 0 0;
  padding: 22px 24px;
  border: 1px solid var(--line);
  background: var(--paper);
}

.dl-card .kicker { margin-bottom: 6px; }

.dl-card h2 {
  margin: 0 0 10px;
  font-size: 20px;
}

.dl-card p { margin: 0 0 12px; }

.dl-card p:last-child { margin-bottom: 0; }

.dl-card .store { margin: 4px 16px 0 0; }

.dl-float {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 15;
  width: min(260px, calc(100vw - 32px));
  padding: 16px 36px 16px 16px;
  border: 1px solid var(--line);
  background: var(--paper);
}

.dl-float p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.55;
}

.dl-float .store {
  display: inline-block;
  margin: 0;
  padding: 7px 12px;
  font-size: 14px;
}

.dl-float-close {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
}

.dl-float-close:hover { color: var(--ink); }

body:has(.dl-float) .article { padding-bottom: 96px; }

.article-meta {
  margin: -8px 0 24px;
  color: var(--muted);
  font-size: 14px;
}

.pager-art {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.pager-art a {
  color: inherit;
  text-decoration: none;
  max-width: 46%;
}

.pager-art a:hover { color: var(--link); }

.pager-art span {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.pager-art .next { text-align: right; margin-left: auto; }

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
}

@media (max-width: 880px) {
  html { scroll-padding-top: 64px; }

  .top {
    display: grid;
    grid-template-columns: 1fr auto auto;
    grid-template-areas:
      "logo lang toggle"
      "nav nav nav";
    align-items: center;
    column-gap: 16px;
    row-gap: 8px;
    min-height: 52px;
    padding: max(10px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) 10px max(16px, env(safe-area-inset-left));
    background: var(--bg);
  }

  .logo {
    grid-area: logo;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .nav-toggle {
    display: inline-flex;
    align-items: center;
    grid-area: toggle;
    min-height: 36px;
  }

  .lang { grid-area: lang; }

  .top-buy { display: none; }

  .top nav {
    display: none;
    grid-area: nav;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: 4px 0 4px;
  }

  .top.is-open nav {
    display: flex;
    max-height: calc(100dvh - 64px);
    overflow-y: auto;
  }

  .top nav a {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 8px 0;
    border-bottom: 1px solid var(--line);
  }

  .layout {
    grid-template-columns: 1fr;
    padding: 24px max(16px, env(safe-area-inset-right)) 64px max(16px, env(safe-area-inset-left));
  }

  .toc {
    position: static;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 16px;
  }

  .toc p { grid-column: 1 / -1; }

  .facts,
  .home .facts,
  .feature-list { grid-template-columns: 1fr; }

  h1,
  .home h1 { font-size: 30px; }

  h2 { font-size: 21px; }

  .lead { font-size: 17px; }

  .home,
  .guides,
  .article {
    padding-left: max(16px, env(safe-area-inset-left));
    padding-right: max(16px, env(safe-area-inset-right));
  }

  .home { padding-top: 36px; }
  .guides,
  .article { padding-top: 28px; }

  .home section + section,
  .doc section + section {
    margin-top: 36px;
    padding-top: 36px;
  }

  .guide-list a {
    grid-template-columns: 2em minmax(0, 1fr);
    align-items: start;
  }

  .guide-list small {
    display: block;
    grid-column: 2;
    margin-top: 4px;
  }

  .foot-grid { grid-template-columns: 1fr; }

  .foot-bar { flex-direction: column; }

  .end,
  .home-end {
    margin-top: 48px;
    padding: 32px max(16px, env(safe-area-inset-right)) max(28px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));
  }

  .pager-art {
    flex-direction: column;
    gap: 16px;
  }

  .pager-art a,
  .pager-art .next {
    max-width: none;
    margin-left: 0;
    text-align: left;
  }

  .dl-card { padding: 18px 16px; }

  .dl-card .store {
    display: flex;
    width: 100%;
    margin: 0 0 12px;
  }

  .dl-float {
    left: 12px;
    right: 12px;
    bottom: max(12px, env(safe-area-inset-bottom));
    width: auto;
  }

  body:has(.dl-float) .article { padding-bottom: 120px; }

  .table-scroll table { min-width: 32em; }

  th, td { padding: 8px 6px; }
}

@media (max-width: 480px) {
  h1,
  .home h1 { font-size: 26px; }

  h2 { font-size: 19px; }

  .lead { font-size: 16px; }

  .top-buy,
  .nav-toggle,
  .lang-btn { padding: 6px 10px; font-size: 13px; }

  .toc { grid-template-columns: 1fr; }

  .hero-actions .store,
  .hero-actions .text-link {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}