@charset "utf-8";

/* ------------------------------
   基本設定
------------------------------ */
:root {
  --bg: #f9f9f9;
  --text: #1a1a1a;
  --subtext: #666;
  --accent: #d4d4d4;
  --max-width: 720px;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Zen Kaku Gothic New", sans-serif;
  line-height: 1.8;
  font-size: 16px;
}

/* ------------------------------
   レイアウト
------------------------------ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ------------------------------
   ヘッダー
------------------------------ */
header {
  padding: 24px 0 16px;
  text-align: left;
}

header .title {
  font-size: 18px;
  font-weight: 400;
  margin: 32px 0 0 25px;
}

header .subtitle {
  font-size: 0.8rem;
  font-weight: 250;
  letter-spacing: 0.03em;
  margin: -0.2rem 0 0 25px;
  opacity: 0.7;
}

/* ------------------------------
   ナビ
------------------------------ */
header nav a {
  font-size: 14px;
  color: var(--subtext);
  text-decoration: none;
  margin-right: 16px;
}

/* ------------------------------
   本文
------------------------------ */
main {
  padding: 40px 0;
}

main p:first-child {
  margin-top: 0;
}

p {
  margin: 1.2em 0;
}

.article-body {
  max-width: 640px;
  font-size: 16px;
  margin-left: 25px;
  padding-top: 2rem;
  padding-bottom: 3rem;
  line-height: 1.8;
}

/* ------------------------------
   ABOUT用
------------------------------ */
.about-description {
  font-size: 1rem;
  line-height: 1.6;
  margin-bottom: 1.5em;
  margin-left: 25px;
}

.about-author {
  font-size: 0.9rem;
  color: #666;
  margin-bottom: 1em;
  margin-left: 25px;
}

.about-search {
  font-size: 0.8rem;
  color: #777;
  text-decoration: none;
  margin-left: 25px;
}

/* ------------------------------
   リンク
------------------------------ */
a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid rgba(0,0,0,0.2);
  padding-bottom: 2px;
  transition: border-color 0.2s ease, color 0.2s ease;
}

a:hover {
  border-bottom-color: rgba(0,0,0,0.4);
  color: rgba(0,0,0,0.85);
}

/* ------------------------------
   フッター
------------------------------ */
footer {
  padding: 40px 0 20px;
  text-align: center;
  font-size: 12px;
  color: var(--subtext);
}

/* ------------------------------
   スマホ対応（768px以下）
------------------------------ */
@media (max-width: 768px) {

  /* スマホ基準 15px */
  html, body {
    font-size: 15px;
    line-height: 1.8;
  }

  .container {
    max-width: none;
    padding: 0 20px;
  }


  .article-body {
    font-size: 0.95rem;
    margin-left: 0;
    padding-top: 1.5rem;
    padding-bottom: 2.5rem;
  }

  /* ABOUT */
  .about-description,
  .about-author,
  .about-search {
    margin-left: 0;
  }

  .about-search {
    text-decoration: underline;
  }


  header {
    padding: 20px 0 12px;
  }

  header .title {
    margin-left: 0;
    font-size: 1.1rem;
  }

  header .subtitle {
    margin-left: 0;
    font-size: 0.75rem;
  }
}