/* コツコツ。共有スタイル (静的コンテンツページ用) */
:root{
  --kachi: #1F2A44;    /* 濃藍 */
  --aizumi: #616D89;   /* 藍鼠 */
  --fuji: #BBBCDE;     /* 淡藤 */
  --shironeri: #F5F4EF;/* 白練 */
  --ink: #2B2A28;      /* 温かいオフブラック */
  --sakura: #D89C9F;
}
*{ box-sizing: border-box; }
html,body{ margin:0; padding:0; }
body{
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--shironeri);
  line-height: 1.75;
  font-size: 16px;
}
a{ color: var(--kachi); text-decoration: none; }
a:hover{ text-decoration: underline; }
header.site{
  background: white;
  border-bottom: 1px solid rgba(97,109,137,0.15);
  padding: 12px 20px;
  position: sticky; top: 0; z-index: 10;
}
header.site .inner{
  max-width: 960px; margin: 0 auto;
  display: flex; align-items: center; gap: 24px;
}
header.site .brand{
  font-weight: 800; font-size: 18px; color: var(--kachi);
  text-decoration: none;
}
header.site .brand .dot{ color: var(--aizumi); }
header.site nav{ display: flex; gap: 20px; font-size: 14px; }
header.site nav a{ color: var(--aizumi); }
header.site nav a.active{ color: var(--kachi); font-weight: 600; }
header.site .cta{
  margin-left: auto;
  background: var(--kachi); color: white;
  padding: 8px 14px; border-radius: 10px; font-size: 13px;
  font-weight: 600;
}
header.site .cta:hover{ text-decoration: none; opacity: 0.9; }

main{
  max-width: 720px;
  margin: 40px auto;
  padding: 0 20px;
}
main.wide{ max-width: 960px; }

h1{ font-size: 30px; font-weight: 800; color: var(--kachi); margin: 8px 0 20px; line-height: 1.3; }
h2{ font-size: 22px; font-weight: 700; color: var(--kachi); margin: 32px 0 12px; }
h3{ font-size: 17px; font-weight: 700; color: var(--ink); margin: 24px 0 8px; }
p{ margin: 14px 0; }
ul,ol{ padding-left: 24px; }
li{ margin: 6px 0; }
blockquote{
  border-left: 4px solid var(--fuji);
  padding: 6px 16px; margin: 20px 0;
  color: var(--aizumi);
  background: white;
  border-radius: 0 8px 8px 0;
}
hr{ border: none; border-top: 1px solid rgba(97,109,137,0.2); margin: 32px 0; }
code, pre{ font-family: SFMono-Regular, Menlo, monospace; font-size: 13px; }
pre{ background: white; padding: 12px 16px; border-radius: 8px; overflow-x: auto; }

.meta{
  color: var(--aizumi);
  font-size: 13px;
  margin-bottom: 20px;
}
.tag{
  display: inline-block; background: var(--fuji); color: var(--kachi);
  padding: 2px 10px; border-radius: 999px; font-size: 12px; font-weight: 600;
  margin-right: 4px;
}
.card{
  background: white; border-radius: 16px; padding: 20px 24px;
  margin: 16px 0;
  border: 1px solid rgba(97,109,137,0.1);
}
.grid{
  display: grid; gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.grid .card h3{ margin-top: 0; }
.grid .card p{ color: var(--aizumi); font-size: 14px; }

.hero{
  background: linear-gradient(135deg, var(--kachi), var(--aizumi));
  color: white; padding: 60px 32px;
  border-radius: 24px; margin: 24px 0;
  text-align: center;
}
.hero h1{ color: white; font-size: 36px; }
.hero p{ color: rgba(255,255,255,0.9); font-size: 17px; }
.hero .cta-lg{
  display: inline-block; background: white; color: var(--kachi);
  padding: 14px 32px; border-radius: 14px; font-weight: 700;
  margin-top: 16px; text-decoration: none;
}

footer.site{
  text-align: center;
  color: var(--aizumi);
  font-size: 13px;
  padding: 40px 20px 60px;
}
footer.site .links{
  margin-bottom: 12px;
}
footer.site .links a{
  color: var(--aizumi); margin: 0 10px;
}

/* AdSense ad slot コンテナ */
.ad-slot{
  margin: 24px 0;
  text-align: center;
  min-height: 90px;
}
.ad-slot .label{
  font-size: 11px; color: var(--aizumi); margin-bottom: 4px;
}

@media (max-width: 640px){
  h1{ font-size: 24px; }
  .hero{ padding: 40px 20px; }
  .hero h1{ font-size: 26px; }
  header.site .inner{ gap: 12px; flex-wrap: wrap; }
  header.site nav{ font-size: 13px; gap: 12px; }
}