/* ==========================================================
   おうち学習のしくみ帳  style.css
   ベース: #FDFBF7 / メイン: #5B8DB8 / アクセント: #E8A66B
   使用色: 4色 + グレースケール
   ========================================================== */

:root {
  --color-base: #FDFBF7;
  --color-main: #5B8DB8;
  --color-main-dark: #3E6A91;
  --color-accent: #E8A66B;
  --color-caution-bg: #FCF4DE;
  --color-text: #333333;
  --color-text-muted: #6E6A63;
  --color-border: #E7E2D8;
  --color-box-bg: #F5F2EA;
  --max-body: 720px;
  --max-site: 1040px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

body {
  font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", "YuGothic", "Meiryo", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background: var(--color-base);
  -webkit-text-size-adjust: 100%;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-main-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--color-main);
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--color-main);
  outline-offset: 2px;
}

/* ---------- レイアウト共通 ---------- */

.site-inner {
  max-width: var(--max-site);
  margin: 0 auto;
  padding: 0 16px;
}

.content-inner {
  max-width: var(--max-body);
  margin: 0 auto;
  padding: 0 16px;
}

.section {
  padding: 40px 0;
}

.section-title {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 20px;
  padding-left: 12px;
  border-left: 4px solid var(--color-main);
}

/* ---------- ヘッダー ---------- */

.site-header {
  background: #FFFFFF;
  border-bottom: 1px solid var(--color-border);
}

.site-header .site-inner {
  padding-top: 14px;
  padding-bottom: 8px;
}

.site-logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.site-logo a {
  color: var(--color-text);
  text-decoration: none;
}

.site-logo a:hover {
  color: var(--color-main-dark);
}

.site-tagline {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* グローバルナビ: JSなし・スマホは横スクロール */
.global-nav {
  margin-top: 10px;
}

.global-nav ul {
  list-style: none;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 6px;
}

.global-nav li {
  flex: 0 0 auto;
}

.global-nav a {
  display: block;
  padding: 6px 12px;
  font-size: 14px;
  color: var(--color-text);
  text-decoration: none;
  border-radius: 16px;
  white-space: nowrap;
  border: 1px solid transparent;
}

.global-nav a:hover {
  background: var(--color-box-bg);
  border-color: var(--color-border);
}

/* ---------- 準備中リンク ---------- */
.global-nav .nav-link {
  display: block;
  padding: 6px 12px;
  font-size: 14px;
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: 16px;
  white-space: nowrap;
  border: 1px solid transparent;
}

.global-nav .nav-link.is-disabled,
.category-grid .category-disabled.is-disabled {
  cursor: default;
  opacity: 0.75;
}

.category-grid .category-disabled {
  display: block;
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-border);
  border-radius: 6px;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 400;
  color: var(--color-text-muted);
  text-decoration: none;
}

/* ---------- ファーストビュー ---------- */

.hero {
  background: linear-gradient(180deg, #FFFFFF 0%, var(--color-base) 100%);
  border-bottom: 1px solid var(--color-border);
  padding: 44px 0 48px;
}

.hero-catch {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.6;
  margin-bottom: 16px;
}

.hero-lead {
  font-size: 15px;
  color: var(--color-text);
  max-width: var(--max-body);
  margin-bottom: 24px;
}

.btn-primary {
  display: inline-block;
  background: var(--color-main);
  color: #FFFFFF;
  font-size: 15px;
  font-weight: 700;
  padding: 12px 28px;
  border-radius: 6px;
  text-decoration: none;
}

.btn-primary:hover {
  background: var(--color-main-dark);
  color: #FFFFFF;
}

/* ---------- カテゴリ導線 ---------- */

.category-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  list-style: none;
}

.category-grid a {
  display: block;
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-main);
  border-radius: 6px;
  padding: 14px 16px;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
}

.category-grid a:hover {
  border-left-color: var(--color-accent);
  background: var(--color-base);
}

.category-grid .category-note {
  display: block;
  font-size: 12px;
  font-weight: 400;
  color: var(--color-text-muted);
  margin-top: 2px;
}

/* 将来カテゴリ(親子IT学習)は控えめに */
.category-grid .is-future a {
  border-left-color: var(--color-border);
  color: var(--color-text-muted);
  font-weight: 400;
}

@media (min-width: 600px) {
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .category-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ---------- 記事カード ---------- */

.article-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  list-style: none;
}

@media (min-width: 600px) {
  .article-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .article-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

.article-card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
}

.article-card a {
  display: block;
  color: var(--color-text);
  text-decoration: none;
  height: 100%;
}

.article-card a:hover .article-card-title {
  color: var(--color-main-dark);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-card-thumb {
  aspect-ratio: 16 / 9;
  background: var(--color-box-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 12px;
}

.article-card-body {
  padding: 12px 14px 14px;
}

.article-card-title {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.5;
  margin-top: 6px;
}

.article-card-date {
  display: block;
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 8px;
}

/* ---------- カテゴリラベル ---------- */

.category-label {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  color: var(--color-main-dark);
  background: #EDF3F8;
  border-radius: 3px;
  padding: 2px 8px;
  letter-spacing: 0.02em;
}

.category-label--sub {
  color: var(--color-text-muted);
  background: var(--color-box-bg);
}

/* ---------- プロフィールボックス ---------- */

.box-profile {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 18px;
}

.box-profile .profile-icon {
  flex: 0 0 56px;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-main);
  color: #FFFFFF;
  font-size: 20px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.box-profile .profile-name {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
}

.box-profile .profile-text {
  font-size: 14px;
  color: var(--color-text);
}

/* ---------- フッター ---------- */

.site-footer {
  margin-top: 48px;
  background: #FFFFFF;
  border-top: 1px solid var(--color-border);
  padding: 28px 0 32px;
  font-size: 13px;
}

.footer-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-bottom: 14px;
}

.footer-nav a {
  color: var(--color-text-muted);
}

.copyright {
  color: var(--color-text-muted);
  font-size: 12px;
}

/* ---------- 記事ページ ---------- */

.breadcrumb {
  font-size: 12px;
  color: var(--color-text-muted);
  padding: 14px 0 0;
}

.breadcrumb ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

.breadcrumb li + li::before {
  content: ">";
  margin: 0 6px;
  color: var(--color-border);
}

.breadcrumb a {
  color: var(--color-text-muted);
}

.article-header {
  padding: 20px 0 8px;
}

.article-title {
  font-size: 24px;
  font-weight: 700;
  line-height: 1.5;
  margin: 10px 0 12px;
}

.article-date {
  font-size: 13px;
  color: var(--color-text-muted);
}

.article-date span + span {
  margin-left: 14px;
}

/* PR表記ボックス */
.box-pr {
  font-size: 12px;
  color: var(--color-text-muted);
  background: var(--color-box-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 6px 12px;
  margin: 14px 0;
  display: inline-block;
}

/* 本文レイアウト */
.article-body {
  padding-bottom: 24px;
}

.article-body > p {
  margin: 1.2em 0;
}

.article-body ul,
.article-body ol {
  margin: 1.2em 0;
  padding-left: 1.6em;
}

.article-body li {
  margin: 0.4em 0;
}

.article-body h2 {
  font-size: 20px;
  font-weight: 700;
  line-height: 1.5;
  margin: 2.4em 0 1em;
  padding: 10px 14px;
  background: #FFFFFF;
  border-left: 5px solid var(--color-main);
  border-bottom: 1px solid var(--color-border);
  border-radius: 0 4px 4px 0;
}

.article-body h3 {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  margin: 2em 0 0.8em;
  padding-left: 10px;
  border-left: 3px solid var(--color-accent);
}

.article-figure {
  margin: 1.5em 0;
}

.article-figure figcaption {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 6px;
}

.img-placeholder {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--color-box-bg);
  border: 1px dashed var(--color-border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 13px;
}

/* ---------- 目次 (details/summary, JSなし) ---------- */

.toc {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  margin: 1.5em 0;
}

.toc summary {
  cursor: pointer;
  font-weight: 700;
  font-size: 15px;
  padding: 12px 16px;
  list-style: none;
}

.toc summary::-webkit-details-marker {
  display: none;
}

.toc summary::after {
  content: "＋";
  float: right;
  color: var(--color-main);
}

.toc[open] summary::after {
  content: "−";
}

.toc ol {
  list-style: decimal;
  margin: 0;
  padding: 0 20px 14px 40px;
  font-size: 14px;
}

.toc li {
  margin: 6px 0;
}

.toc a {
  text-decoration: none;
}

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

/* ---------- 注意ボックス ---------- */

.box-caution {
  background: var(--color-caution-bg);
  border: 1px solid #E9D9A8;
  border-radius: 8px;
  padding: 14px 16px;
  margin: 1.5em 0;
  font-size: 15px;
}

.box-caution .box-title {
  display: block;
  font-weight: 700;
  margin-bottom: 6px;
  color: #7A5E1E;
}

.box-caution .box-title::before {
  content: "⚠ ";
}

/* ---------- 体験談ボックス ---------- */

.box-experience {
  background: #EFF5F9;
  border: 1px solid #D5E2EC;
  border-radius: 8px;
  padding: 14px 16px;
  margin: 1.5em 0;
  font-size: 15px;
}

.box-experience .box-title {
  display: block;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--color-main-dark);
}

.box-experience .box-title::before {
  content: "✎ ";
}

/* ---------- AIプロンプト表示ボックス ---------- */

.box-prompt {
  background: #F3F1EC;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  margin: 1.5em 0;
  overflow: hidden;
}

.box-prompt .prompt-label {
  display: block;
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text-muted);
  background: #EAE6DD;
  padding: 6px 14px;
}

.box-prompt pre {
  padding: 14px 16px;
  overflow-x: auto;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 13px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
}

/* ---------- チェックリスト ---------- */

.checklist {
  list-style: none;
  margin: 1.2em 0;
  padding: 0;
}

.article-body .checklist {
  padding-left: 0;
}

.checklist li {
  padding-left: 28px;
  position: relative;
  margin: 0.6em 0;
}

.checklist li::before {
  content: "✔";
  position: absolute;
  left: 4px;
  color: var(--color-main);
  font-weight: 700;
}

/* ---------- 比較表 ---------- */

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 1.5em 0;
}

.compare-table {
  border-collapse: collapse;
  width: 100%;
  min-width: 560px;
  font-size: 14px;
  background: #FFFFFF;
}

.compare-table th,
.compare-table td {
  border: 1px solid var(--color-border);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.compare-table thead th {
  background: #EDF3F8;
  color: var(--color-main-dark);
  white-space: nowrap;
}

.compare-table tbody th {
  background: var(--color-base);
  white-space: nowrap;
  font-weight: 700;
}

/* ---------- CTAボックス ---------- */

.box-cta {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-top: 3px solid var(--color-main);
  border-radius: 8px;
  padding: 20px 18px;
  margin: 2em 0;
  text-align: center;
}

.box-cta .cta-text {
  font-size: 15px;
  margin-bottom: 14px;
  text-align: left;
}

.box-cta .btn-primary {
  min-width: 220px;
}

.box-cta .cta-note {
  display: block;
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 10px;
}

/* ---------- 内部リンクカード ---------- */

.card-internal-link {
  margin: 1.5em 0;
}

.card-internal-link a {
  display: block;
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 12px 16px;
  text-decoration: none;
  color: var(--color-text);
}

.card-internal-link a:hover {
  background: var(--color-base);
}

.card-internal-link .link-label {
  display: block;
  font-size: 11px;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 4px;
}

.card-internal-link .link-title {
  font-size: 15px;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 前後記事リンク ---------- */

.post-nav {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin: 2em 0;
}

@media (min-width: 600px) {
  .post-nav {
    grid-template-columns: 1fr 1fr;
  }
}

.post-nav a {
  display: block;
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 12px 14px;
  font-size: 14px;
  color: var(--color-text);
  text-decoration: none;
}

.post-nav a:hover {
  background: var(--color-base);
}

.post-nav .nav-label {
  display: block;
  font-size: 11px;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}

.post-nav .nav-next {
  text-align: right;
}

/* ---------- 固定ページ・404 ---------- */

.page-body {
  padding: 8px 0 24px;
}

.page-body h1 {
  font-size: 24px;
  margin: 24px 0 20px;
}

.page-body h2 {
  font-size: 18px;
  font-weight: 700;
  margin: 2em 0 0.8em;
  padding-left: 10px;
  border-left: 4px solid var(--color-main);
}

.page-body p {
  margin: 1em 0;
}

.page-body ul {
  margin: 1em 0;
  padding-left: 1.6em;
}

.notfound {
  text-align: center;
  padding: 56px 0 32px;
}

.notfound .notfound-code {
  font-size: 40px;
  font-weight: 700;
  color: var(--color-main);
  margin-bottom: 8px;
}

.notfound p {
  margin: 0.8em 0;
}

.notfound .btn-primary {
  margin-top: 16px;
}

.notfound-categories {
  margin-top: 40px;
  text-align: left;
}