/* =============================================
   Web開発入門 - 固有スタイルシート
   ============================================= */

body {
  font-size: 17px;
  line-height: 1.8;
}

/* --- ヘッダー（learn固有レイアウト） --- */
header .site-name {
  font-size: 20px;
}

/* --- パンくずリスト --- */
.breadcrumb {
  background-color: var(--color-light);
  padding: 10px 0;
  font-size: 13px;
  color: var(--color-main);
  border-bottom: 1px solid var(--color-sub);
}

.breadcrumb a {
  color: var(--color-main);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb span {
  margin: 0 6px;
  color: var(--color-sub);
}

/* --- メインコンテンツ --- */
main {
  padding: 40px 0 60px;
}

/* --- ページタイトル --- */
.page-title {
  margin-bottom: 32px;
}

.chapter-label {
  display: inline-block;
  background-color: var(--color-main);
  color: #fff;
  font-size: 12px;
  font-weight: bold;
  padding: 3px 10px;
  border-radius: 3px;
  margin-bottom: 8px;
  letter-spacing: 0.05em;
}

.page-title h1 {
  font-size: 28px;
  color: #00293C;
  line-height: 1.4;
  border-bottom: 3px solid var(--color-accent);
  padding-bottom: 12px;
}

/* --- 見出し --- */
h2 {
  font-size: 22px;
  color: #00293C;
  margin: 48px 0 16px;
  padding-left: 12px;
  border-left: 4px solid var(--color-accent);
}

h3 {
  font-size: 18px;
  color: var(--color-main);
  margin: 32px 0 12px;
}

/* --- 段落・テキスト --- */
p {
  margin-bottom: 16px;
}

strong {
  color: #00293C;
  font-weight: bold;
}

/* --- リスト --- */
ul, ol {
  margin: 12px 0 16px 24px;
}

li {
  margin-bottom: 6px;
}

/* --- コードブロック --- */
pre {
  background-color: #00293C;
  color: #9BBFC4;
  padding: 20px 24px;
  border-radius: 6px;
  overflow-x: auto;
  margin: 16px 0 24px;
  font-size: 15px;
  line-height: 1.6;
  font-family: "Consolas", "Courier New", monospace;
  border-left: 3px solid var(--color-main);
}

code {
  background-color: var(--color-light);
  color: var(--color-main);
  padding: 2px 6px;
  border-radius: 3px;
  font-family: "Consolas", "Courier New", monospace;
  font-size: 0.9em;
}

pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

/* --- 見出しアイコン配置 --- */
h2 .bi, h3 .bi {
  margin-right: 6px;
  vertical-align: -0.1em;
}

/* --- 注意ボックス --- */
.note {
  background-color: var(--color-light);
  border-left: 4px solid var(--color-accent);
  padding: 14px 18px;
  margin: 20px 0;
  border-radius: 0 4px 4px 0;
}

.note::before {
  font-family: "bootstrap-icons", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
  content: "\f431  メモ";
  display: block;
  font-size: 12px;
  font-weight: bold;
  color: var(--color-accent);
  margin-bottom: 4px;
  letter-spacing: 0.05em;
}

.tip {
  background-color: var(--color-tip-bg);
  border-left: 4px solid var(--color-main);
  padding: 14px 18px;
  margin: 20px 0;
  border-radius: 0 4px 4px 0;
}

.tip::before {
  font-family: "bootstrap-icons", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
  content: "\f46b  ポイント";
  display: block;
  font-size: 12px;
  font-weight: bold;
  color: var(--color-main);
  margin-bottom: 4px;
  letter-spacing: 0.05em;
}

.warning {
  background-color: #fde8e8;
  border-left: 4px solid #e53e3e;
  padding: 14px 18px;
  margin: 20px 0;
  border-radius: 0 4px 4px 0;
}

.warning::before {
  font-family: "bootstrap-icons", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
  content: "\f33b  注意";
  display: block;
  font-size: 12px;
  font-weight: bold;
  color: #e53e3e;
  margin-bottom: 4px;
  letter-spacing: 0.05em;
}

/* --- 手順ボックス --- */
.steps {
  background-color: #fff;
  border: 1px solid var(--color-sub);
  border-radius: 6px;
  padding: 20px 24px;
  margin: 20px 0;
}

.steps ol {
  margin-left: 20px;
}

.steps li {
  margin-bottom: 12px;
  padding-left: 4px;
}

/* --- ナビゲーション（章間移動） --- */
.chapter-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 60px;
  padding-top: 24px;
  border-top: 2px solid var(--color-sub);
  gap: 12px;
}

.chapter-nav a {
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--color-accent);
  color: #fff;
  text-decoration: none;
  border-radius: 4px;
  font-size: 14px;
  transition: background-color 0.15s;
}

.chapter-nav a:hover {
  background-color: var(--color-accent-dark);
}

.chapter-nav .prev::before {
  content: "← ";
}

.chapter-nav .next::after {
  content: " →";
}

.chapter-nav .spacer {
  flex: 1;
}

/* --- トップページ専用：目次カード --- */
.toc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 32px;
}

.toc-card {
  background-color: #fff;
  border: 1px solid var(--color-sub);
  border-radius: 8px;
  padding: 20px 24px;
  text-decoration: none;
  color: #00293C;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  transition: box-shadow 0.15s, border-color 0.15s;
}

.toc-card:hover {
  box-shadow: 0 4px 16px var(--color-main-shadow);
  border-color: var(--color-main);
}

.toc-card .chapter-num {
  background-color: var(--color-main);
  color: #fff;
  font-size: 13px;
  font-weight: bold;
  padding: 4px 10px;
  border-radius: 3px;
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 2px;
}

.toc-card .card-body h2 {
  font-size: 17px;
  margin: 0 0 4px;
  padding: 0;
  border: none;
  color: #00293C;
}

.toc-card .card-body p {
  font-size: 14px;
  color: var(--color-main);
  margin: 0;
}

/* --- トップページ：ヒーローエリア --- */
.hero {
  background-color: var(--color-light);
  color: #00293C;
  padding: 40px 0;
  text-align: center;
  border-bottom: 2px solid var(--color-sub);
}

.hero-icons {
  font-size: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  margin-bottom: 16px;
  line-height: 1;
}

.hero-arrow {
  font-size: 28px;
  opacity: 0.4;
  font-style: normal;
}

.hero-lead {
  font-size: 20px;
  font-weight: bold;
  margin: 0 0 8px;
  color: #00293C;
}

.hero-sub {
  font-size: 15px;
  color: var(--color-main);
  margin: 0;
}

.intro-box {
  background-color: #fff;
  border: 1px solid var(--color-sub);
  border-radius: 6px;
  padding: 24px 28px;
  margin-bottom: 16px;
}

.intro-box h2 {
  border: none;
  padding: 0;
  margin: 0 0 12px;
  font-size: 18px;
}