:root {
  --paper: #F1F9FC;
  --card: #FFFDF6;
  --ink: #21303B;
  --ink-soft: #4A606D;
  --accent: #D2440C;
  --sky: #EAF6FA;
  --warm: #FFF6E8;
  --sun: #FFCB33;
  --rule: #21303B1F;
  --shadow: 0 1px 2px rgba(33,48,59,.06), 0 8px 24px rgba(33,48,59,.06);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #12191D;
    --card: #1A2226;
    --ink: #ECEFEC;
    --ink-soft: #9FB0B6;
    --accent: #FF8A57;
    --sky: #1E3540;
    --warm: #2A2620;
    --rule: #ECEFEC26;
    --shadow: none;
  }
}
:root[data-theme="dark"] {
  --paper: #12191D;
  --card: #1A2226;
  --ink: #ECEFEC;
  --ink-soft: #9FB0B6;
  --accent: #FF8A57;
  --sky: #1E3540;
  --warm: #2A2620;
  --rule: #ECEFEC26;
  --shadow: none;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: 'Noto Sans JP', system-ui, sans-serif;
  line-height: 1.8;
}
a { color: var(--accent); }
.wrap { max-width: 720px; margin: 0 auto; padding: 36px 20px 64px; }

.mast { display: flex; align-items: center; gap: 14px; margin-bottom: 22px; }
.mast-link { text-decoration: none; color: inherit; display: block; }
.mast .logo { height: 44px; width: auto; display: block; flex-shrink: 0; }
.mast .sub { white-space: nowrap; font-size: 12px; font-weight: 700; color: var(--ink-soft); padding-left: 14px; border-left: 2px solid var(--rule); line-height: 1.5; }
:root[data-theme="dark"] .mast .logo, :root:not([data-theme="light"]) .mast .logo { }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .mast .logo { background: #FFFDF6; border-radius: 12px; padding: 6px 12px; } }
:root[data-theme="dark"] .mast .logo { background: #FFFDF6; border-radius: 12px; padding: 6px 12px; }

nav.tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 28px; }
nav.tabs a {
  font-size: 12.5px; font-weight: 700; text-decoration: none;
  color: var(--ink-soft); background: var(--card); border: 1px solid var(--rule);
  padding: 8px 14px; border-radius: 999px; font-family: 'M PLUS Rounded 1c', sans-serif;
}
nav.tabs a.current { color: #fff; background: var(--accent); border: 2px solid var(--ink); box-shadow: 0 2px 0 var(--ink); padding: 7px 13px; }

h1 {
  font-family: 'M PLUS Rounded 1c', sans-serif;
  font-weight: 800;
  font-size: 22px;
  margin: 0 0 6px;
  text-wrap: balance;
}
.updated { font-size: 12.5px; color: var(--ink-soft); margin-bottom: 28px; }

.card {
  background: var(--card);
  border-radius: 24px;
  padding: 28px 26px;
  border: 1px solid var(--rule);
  box-shadow: var(--shadow);
}

.intro { font-size: 14px; color: var(--ink); margin: 0 0 24px; }

h2 {
  font-family: 'M PLUS Rounded 1c', sans-serif;
  font-weight: 700;
  font-size: 15.5px;
  color: var(--ink);
  margin: 26px 0 10px;
  padding-top: 18px;
  border-top: 1px solid var(--rule);
}
h2:first-of-type { margin-top: 0; padding-top: 0; border-top: none; }

h3 {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-soft);
  margin: 14px 0 6px;
}

p { font-size: 13.5px; margin: 0 0 10px; }
ul { margin: 0 0 12px; padding-left: 1.3em; }
li { font-size: 13.5px; margin-bottom: 4px; }

.contact-box {
  background: var(--warm);
  border: 1px solid var(--rule);
  border-radius: 16px;
  padding: 14px 16px;
  font-size: 13.5px;
  margin-bottom: 4px;
}
.contact-box .row { display: flex; gap: 8px; margin-bottom: 4px; }
.contact-box .row:last-child { margin-bottom: 0; }
.contact-box .label { font-weight: 700; color: var(--ink-soft); min-width: 4.5em; }

.faq-item { margin-bottom: 18px; }
.faq-q { font-weight: 700; font-size: 14px; margin-bottom: 4px; }
.faq-q::before { content: "Q. "; color: var(--accent); }
.faq-a { font-size: 13.5px; color: var(--ink-soft); margin: 0; }
.faq-a::before { content: "A. "; color: var(--ink-soft); font-weight: 700; }

.appgrid { display: flex; gap: 10px; flex-wrap: wrap; margin: 10px 0 4px; }
.appchip {
  flex: 1; min-width: 150px; background: var(--sky); border: 1px solid var(--rule); border-radius: 16px; padding: 16px 14px; text-align: center;
}
.appchip img { width: 72px; height: 72px; border-radius: 16px; display: block; margin: 0 auto 10px; box-shadow: 0 2px 8px rgba(33,48,59,.18); }
.appchip .t { font-family: 'M PLUS Rounded 1c', sans-serif; font-weight: 800; font-size: 14px; }
.appchip .d { font-size: 12px; color: var(--ink-soft); margin-top: 2px; }

footer {
  margin-top: 26px;
  text-align: right;
  font-size: 12px;
  color: var(--ink-soft);
}

@media (max-width: 480px) {
  .mast { flex-direction: column; align-items: flex-start; gap: 8px; }
  .mast .sub { border-left: none; padding-left: 2px; }
  .wrap { padding: 24px 14px 48px; }
  .card { padding: 22px 16px; border-radius: 20px; }
  .mast .logo { height: 40px; }
}