/*
Theme Name: Maah Theme
Theme URI: https://maahsachi.com
Author: maah
Author URI: https://maahsachi.com
Description: 非エンジニアのためのClaude実務活用ブログテーマ。モダンでクリーン、読みやすさ最優先の1カラムデザイン。
Version: 2.0.0
Requires at least: 6.4
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: maah-theme
Tags: blog, one-column, custom-menu, featured-images, custom-logo, responsive, translation-ready
*/

/* ===== CSS Custom Properties ===== */
:root {
  --color-primary: #1a1a2e;
  --color-accent: #e94560;
  --color-accent-hover: #d63851;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-muted: #999999;
  --color-bg: #f8f9fa;
  --color-white: #ffffff;
  --color-border: #e2e8f0;
  --color-code-bg: #16213e;
  --font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', Consolas, 'Courier New', monospace;
  --content-width: 740px;
  --site-width: 1200px;
  --header-height: 64px;
}

/* ===== Reset & Base ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s;
}

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

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

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--color-primary);
  height: var(--header-height);
  transition: box-shadow 0.3s;
}

.site-header.scrolled {
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.header-inner {
  max-width: var(--site-width);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-branding a {
  color: var(--color-white);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.site-branding .site-description {
  color: var(--color-text-muted);
  font-size: 0.75rem;
  font-weight: 400;
  margin-top: 2px;
}

/* ナビゲーション */
.main-navigation ul {
  list-style: none;
  display: flex;
  gap: 28px;
}

.main-navigation a {
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 4px 0;
  position: relative;
}

.main-navigation a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width 0.3s;
}

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

.main-navigation a:hover::after {
  width: 100%;
}

/* ハンバーガーメニュー */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-white);
  margin: 6px 0;
  transition: transform 0.3s, opacity 0.3s;
}

.menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 6px);
}

.menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -6px);
}

/* ===== Main Content ===== */
.site-main {
  margin-top: var(--header-height);
  min-height: calc(100vh - var(--header-height) - 200px);
}

/* ===== トップページ: カード一覧 ===== */
.posts-grid {
  max-width: var(--site-width);
  margin: 0 auto;
  padding: 48px 24px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}

.post-card {
  display: flex;
  flex-direction: column;
  background: var(--color-white);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  transition: transform 0.2s, box-shadow 0.2s;
}

.post-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.post-card__thumbnail {
  flex-shrink: 0;
  height: 200px;
  overflow: hidden;
  background: var(--color-primary);
}

.post-card__thumbnail a {
  display: block;
  width: 100%;
  height: 100%;
}

.post-card__thumbnail img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}

.post-card:hover .post-card__thumbnail img {
  transform: scale(1.03);
}

.post-card__body {
  flex: 1;
  padding: 20px 24px 24px;
}

.post-card__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 10px;
}

.category-badge {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-white);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 4px;
  letter-spacing: 0.02em;
}

.post-card__date {
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

.post-card__title {
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 8px;
}

.post-card__title a {
  color: var(--color-text);
}

.post-card__title a:hover {
  color: var(--color-accent);
}

.post-card__excerpt {
  color: var(--color-text-light);
  font-size: 0.85rem;
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ===== 記事ページ ===== */
.single-article {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.single-article__header {
  margin-bottom: 40px;
}

.single-article__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.single-article__date {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.single-article__title {
  font-size: 2rem;
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: -0.01em;
}

.single-article__thumbnail {
  margin: 32px -60px 40px;
  border-radius: 12px;
  overflow: hidden;
}

/* 目次 */
.toc {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 24px 28px;
  margin-bottom: 40px;
}

.toc__title {
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--color-text);
}

.toc ol {
  list-style: none;
  counter-reset: toc;
  padding-left: 0;
}

.toc > ol > li {
  counter-increment: toc;
  margin-bottom: 6px;
}

.toc > ol > li::before {
  content: counter(toc) ". ";
  color: var(--color-accent);
  font-weight: 600;
}

.toc a {
  color: var(--color-text-light);
  font-size: 0.9rem;
}

.toc a:hover {
  color: var(--color-accent);
}

.toc ol ol {
  padding-left: 20px;
  margin-top: 4px;
}

.toc ol ol li {
  margin-bottom: 4px;
}

.toc ol ol li::before {
  content: "- ";
  color: var(--color-text-muted);
}

/* 記事本文 */
.single-article__content {
  font-size: 17px;
  line-height: 1.85;
}

.single-article__content p {
  margin-bottom: 1.6em;
}

.single-article__content h2 {
  font-size: 1.5rem;
  font-weight: 800;
  margin: 2.5em 0 1em;
  padding: 0 0 8px 16px;
  border-left: 4px solid var(--color-accent);
  border-bottom: 1px solid var(--color-border);
}

.single-article__content h3 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 2em 0 0.8em;
  padding-left: 14px;
  border-left: 3px solid var(--color-accent);
}

.single-article__content h4 {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 1.5em 0 0.6em;
}

.single-article__content ul,
.single-article__content ol {
  margin: 0 0 1.6em 1.5em;
}

.single-article__content li {
  margin-bottom: 0.4em;
}

.single-article__content blockquote {
  border-left: 4px solid var(--color-accent);
  background: var(--color-white);
  padding: 16px 24px;
  margin: 1.6em 0;
  border-radius: 0 8px 8px 0;
  color: var(--color-text-light);
}

.single-article__content pre {
  background: var(--color-code-bg);
  color: #e2e8f0;
  padding: 20px 24px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.6em 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  line-height: 1.6;
}

.single-article__content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: #edf2f7;
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--color-accent);
}

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

.single-article__content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.6em 0;
  font-size: 0.95rem;
}

.single-article__content th,
.single-article__content td {
  border: 1px solid var(--color-border);
  padding: 10px 14px;
  text-align: left;
}

.single-article__content th {
  background: var(--color-primary);
  color: var(--color-white);
  font-weight: 600;
}

.single-article__content img {
  border-radius: 8px;
  margin: 1em 0;
}

.single-article__content strong {
  font-weight: 700;
  color: var(--color-text);
}

.single-article__content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2.5em 0;
}

/* SNSシェアボタン */
.share-buttons {
  display: flex;
  gap: 12px;
  margin: 48px 0 40px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-white);
  transition: opacity 0.2s;
}

.share-btn:hover {
  opacity: 0.85;
  color: var(--color-white);
}

.share-btn--x {
  background: #000000;
}

.share-btn--hatena {
  background: #00A4DE;
}

/* 前後記事リンク */
.post-navigation {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 40px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.post-navigation__item {
  padding: 16px 20px;
  background: var(--color-white);
  border-radius: 8px;
  border: 1px solid var(--color-border);
  transition: border-color 0.2s;
}

.post-navigation__item:hover {
  border-color: var(--color-accent);
}

.post-navigation__label {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}

.post-navigation__title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.5;
}

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

/* パンくずリスト */
.breadcrumb {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 16px 24px 0;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

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

.breadcrumb a:hover {
  color: var(--color-accent);
}

.breadcrumb__separator {
  margin: 0 6px;
}

/* ===== アーカイブページ ===== */
.archive-header {
  max-width: var(--site-width);
  margin: 0 auto;
  padding: 48px 24px 0;
}

.archive-header__title {
  font-size: 1.6rem;
  font-weight: 800;
}

.archive-header__description {
  color: var(--color-text-light);
  margin-top: 8px;
}

/* ===== ページネーション ===== */
.pagination {
  max-width: var(--site-width);
  margin: 0 auto;
  padding: 20px 24px 60px;
  display: flex;
  justify-content: center;
  gap: 8px;
}

.pagination .page-numbers {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-light);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  transition: all 0.2s;
}

.pagination .page-numbers:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.pagination .page-numbers.current {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-white);
}

/* ===== 404 ===== */
.error-404 {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 80px 24px;
  text-align: center;
}

.error-404__title {
  font-size: 5rem;
  font-weight: 800;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.error-404__message {
  font-size: 1.2rem;
  color: var(--color-text-light);
  margin-bottom: 32px;
}

/* ===== 検索 ===== */
.search-form {
  display: flex;
  max-width: 480px;
}

.search-form .search-field {
  flex: 1;
  padding: 10px 16px;
  border: 1px solid var(--color-border);
  border-radius: 6px 0 0 6px;
  font-size: 0.95rem;
  font-family: var(--font-body);
  outline: none;
}

.search-form .search-field:focus {
  border-color: var(--color-accent);
}

.search-form .search-submit {
  padding: 10px 20px;
  background: var(--color-accent);
  color: var(--color-white);
  border: none;
  border-radius: 0 6px 6px 0;
  font-weight: 600;
  cursor: pointer;
  font-family: var(--font-body);
  transition: background 0.2s;
}

.search-form .search-submit:hover {
  background: var(--color-accent-hover);
}

/* ===== フッター ===== */
.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.7);
  padding: 48px 24px 32px;
}

.footer-inner {
  max-width: var(--site-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.footer-section__title {
  color: var(--color-white);
  font-size: 0.9rem;
  font-weight: 700;
  margin-bottom: 16px;
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: 8px;
}

.footer-section a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.85rem;
  transition: color 0.2s;
}

.footer-section a:hover {
  color: var(--color-white);
}

.footer-bottom {
  max-width: var(--site-width);
  margin: 40px auto 0;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
}

.footer-bottom__powered {
  color: rgba(255, 255, 255, 0.4);
}

/* ===== レスポンシブ ===== */
@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .menu-toggle {
    display: block;
  }

  .main-navigation {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-primary);
    padding: 16px 24px 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

  .main-navigation.active {
    display: block;
  }

  .main-navigation ul {
    flex-direction: column;
    gap: 0;
  }

  .main-navigation a {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }

  .posts-grid {
    grid-template-columns: 1fr;
    padding: 24px 16px;
    gap: 20px;
  }

  .single-article {
    padding: 24px 16px 60px;
  }

  .single-article__title {
    font-size: 1.5rem;
  }

  .single-article__thumbnail {
    margin: 24px -16px 32px;
    border-radius: 0;
  }

  .single-article__content {
    font-size: 16px;
  }

  .single-article__content h2 {
    font-size: 1.3rem;
  }

  .post-navigation {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .share-buttons {
    flex-direction: column;
  }

  .share-btn {
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .post-card__body {
    padding: 16px;
  }
}