/* ========================================
   目次
   ========================================
   1. CSS変数とテーマ設定
   2. リセットと基本スタイル
   3. レイアウトとグリッド
   4. タイポグラフィ
   5. コンポーネント
      - ボタン
      - カード
      - ナビゲーション
      - サイドバー
      - フッター
   6. ページ
      - ホーム/ヒーロー
      - About
      - Portfolio
      - 記事詳細
   7. ユーティリティ
   8. ローディング画面
   9. レスポンシブデザイン
   ======================================== */

/* ========================================
   1. CSS変数とテーマ設定
   ======================================== */
:root {
    /* Colors - Light Mode */
    --color-text-primary: #000;
    --color-text-secondary: #666;
    --color-text-accent: #333;
    --color-bg-primary: #fff;
    --color-bg-secondary: #f0f0f0;
    --color-bg-hover: #f0faff;
    
    --color-border-light: #e0e0e0;
    --color-border-medium: #333;
    
    --color-brand: #00bcd4;
    --color-brand-light: #4dd0e1;
    
    --color-footer-bg: #333;
    --color-footer-text: #fff;
    
    --color-code-bg: #272822;
    --color-code-text: #f8f8f2;
    --color-inline-code-bg: rgba(0, 0, 0, 0.05);
    
    --color-shadow: rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 15px;
    --spacing-md: 30px;
    --spacing-lg: 60px;
    --spacing-xl: 100px;
    
    /* Typography */
    --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-family-mono: 'Consolas', 'Monaco', 'Courier New', monospace;
    
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.85rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.3rem;
    --font-size-xl: 1.8rem;
    --font-size-2xl: 2.2rem;
    --font-size-3xl: 2.8rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.4s ease;
    
    /* Border Radius */
    --radius-sm: 3px;
    --radius-md: 5px;
    --radius-lg: 8px;
    --radius-xl: 30px;
    --radius-full: 50%;
    
    /* Z-index layers */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 1000;
    --z-fixed: 1001;
    --z-overlay: 9999;
    --z-modal: 10000;
}

/* ダークモード機能を無効化
@media (prefers-color-scheme: dark) {
    :root {
        --color-text-primary: #e0e0e0;
        --color-text-secondary: #aaaaaa;
        --color-text-accent: #ffffff;
        --color-bg-primary: #121212;
        --color-bg-secondary: #1e1e1e;
        --color-bg-hover: #2c2c2c;
        
        --color-border-light: #333333;
        --color-border-medium: #555555;
        
        --color-brand-light: #4dd0e1;
        
        --color-footer-bg: #000000;
        --color-footer-text: #cccccc;
        
        --color-code-bg: #2d2d2d;
        --color-shadow: rgba(0, 0, 0, 0.5);
        --color-inline-code-bg: rgba(255, 255, 255, 0.1);
    }
}
*/

/* ========================================
   2. リセットと基本スタイル
   ======================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    overflow-x: hidden;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family-base);
    line-height: 1.7;
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    overflow-x: hidden;
}

body.menu-active,
body:not(.page-loaded) {
    overflow: hidden;
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: opacity var(--transition-base);
}

a:hover {
    opacity: 0.7;
}

/* ========================================
   3. レイアウトとグリッド
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    position: relative;
    z-index: var(--z-base);
}

.main-content-wrapper {
    display: grid;
    grid-template-columns: 3fr 1fr;
    gap: 40px;
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    position: relative;
    z-index: var(--z-base);
}

.article-sections {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.section-padding {
    padding: var(--spacing-xl) 0;
}

/* ========================================
   4. タイポグラフィ
   ======================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.4;
    color: var(--color-text-accent);
}

h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
    padding-bottom: 10px;
    border-bottom: 1px solid var(--color-border-light);
}

.section-title-center {
    text-align: center;
    width: fit-content;
    margin: 0 auto 40px;
}

.text-center {
    text-align: center;
    margin-top: 50px;
}

/* ========================================
   5. コンポーネント
   ======================================== */

/* ----- ボタン ----- */
.button {
    display: inline-block;
    padding: 12px 35px;
    border: 2px solid;
    border-radius: var(--radius-xl);
    transition: background-color var(--transition-base), 
                color var(--transition-base), 
                border-color var(--transition-base);
    font-weight: 600;
    letter-spacing: 0.05em;
    cursor: pointer;
}

.primary-button {
    background-color: var(--color-text-primary);
    color: var(--color-bg-primary);
    border-color: var(--color-text-primary);
}

.primary-button:hover {
    background-color: var(--color-text-accent);
    border-color: var(--color-text-accent);
    opacity: 1;
}

.secondary-button {
    background-color: transparent;
    color: var(--color-text-primary);
    border-color: var(--color-text-primary);
    border-radius: var(--radius-md);
}

.secondary-button:hover {
    background-color: var(--color-text-primary);
    color: var(--color-bg-primary);
    opacity: 1;
}

.small-button {
    padding: 6px var(--spacing-sm);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-md);
    width: 100%;
    margin-top: var(--spacing-sm);
}

.to-top-button {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    background-color: var(--color-text-primary);
    color: var(--color-bg-primary);
    border-radius: var(--radius-full);
    text-align: center;
    line-height: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), 
                visibility var(--transition-base);
    z-index: var(--z-fixed);
    cursor: pointer;
}

.to-top-button.is-visible {
    opacity: 1;
    visibility: visible;
}

/* ----- カード ----- */
.post-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

.post-card {
    background-color: var(--color-bg-primary);
    padding: 25px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
    transition: box-shadow var(--transition-base), 
                transform var(--transition-base);
}

.post-card:hover {
    box-shadow: 0 5px 15px var(--color-shadow);
    transform: translateY(-3px);
}

.post-card .category a {
    display: inline-block;
    background-color: var(--color-text-accent);
    color: var(--color-bg-primary);
    padding: 4px 12px;
    font-size: 0.8rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

.post-card h4 {
    font-size: var(--font-size-lg);
    margin-bottom: 10px;
    line-height: 1.5;
    font-weight: 600;
}

.post-card .date {
    color: var(--color-text-accent);
    font-size: var(--font-size-sm);
}

/* カードにサムネイル付き */
.post-card.post-card-with-thumb {
    padding: 0;
    overflow: hidden;
}

.post-card-thumb-link {
    display: block;
    height: 0;
    padding-bottom: 56.25%;
    overflow: hidden;
    position: relative;
    margin-bottom: var(--spacing-sm);
}

.post-card-thumb-link img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-base);
}

.post-card.post-card-with-thumb:hover img {
    transform: scale(1.05);
}

.post-card-content {
    padding: 0 25px 25px;
}

.post-card-content .category {
    margin-bottom: 10px;
}

/* ポートフォリオカード */
.portfolio-card-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
    margin: var(--spacing-md) 0 var(--spacing-lg);
}

.portfolio-card-item {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: 10px;
    overflow: hidden;
    transition: transform var(--transition-base), 
                box-shadow var(--transition-base);
    display: flex;
    flex-direction: column;
}

.portfolio-card-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
}

.portfolio-card-thumb {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
}

.portfolio-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.portfolio-card-content {
    padding: 25px;
    flex-grow: 1;
}

.portfolio-card-content .title {
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0 0 10px 0;
    line-height: 1.4;
}

.portfolio-card-content .title a {
    color: var(--color-text-accent);
}

.portfolio-subtitle {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    display: block;
    border-left: 3px solid #ccc;
    padding-left: 10px;
}

.category-label {
    display: block;
    margin-top: auto;
}

.category-label a {
    font-size: var(--font-size-xs);
    color: #888;
    background: var(--color-bg-secondary);
    padding: 4px 12px;
    border-radius: var(--radius-xl);
    transition: background var(--transition-fast);
}

.category-label a:hover {
    background: #e0e0e0;
    opacity: 1;
}

/* ----- ナビゲーション ----- */
header {
    background-color: var(--color-bg-primary);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    border-bottom: 1px solid var(--color-border-light);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 a {
    font-size: 1.5rem;
    font-weight: 700;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 5px;
    transition: transform var(--transition-base);
}

#global-nav > ul {
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;
}

#global-nav ul li {
    margin-left: var(--spacing-md);
}

#global-nav a {
    font-weight: 500;
    font-size: 0.95rem;
}

/* 技術カテゴリナビゲーション */
.tech-nav.pc-only-nav {
    background-color: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border-light);
    padding: 10px 0;
    text-align: center;
}

.tech-nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    margin: 0;
    padding: 0;
}

.tech-nav ul li {
    margin: 0 var(--spacing-sm);
}

.tech-nav a {
    display: block;
    padding: 5px 0;
    font-weight: 600;
    font-size: 0.9rem;
    position: relative;
    color: var(--color-text-accent);
}

.tech-nav a::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-text-primary);
    transition: width var(--transition-base);
}

.tech-nav a:hover {
    opacity: 1;
    color: var(--color-text-primary);
}

.tech-nav a:hover::after {
    width: 100%;
}

#tech-nav-mobile {
    display: none;
}

/* ----- サイドバー ----- */
.sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.sidebar-widget {
    background-color: var(--color-bg-primary);
    padding: 25px;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
}

.sidebar-widget h4 {
    font-size: 1.2rem;
    font-weight: 700;
    border-bottom: 2px solid var(--color-border-light);
    padding-bottom: 10px;
    margin-bottom: 20px;
    color: var(--color-text-primary);
    text-align: left;
    width: 100%;
}

/* プロフィールカード */
.profile-card {
    text-align: center;
}

.profile-img {
    border-radius: var(--radius-full);
    margin-bottom: var(--spacing-sm);
    width: 100px;
    height: 100px;
    object-fit: cover;
}

.profile-name {
    font-weight: 600;
    margin-bottom: 10px;
}

.profile-bio {
    font-size: 0.9rem;
    text-align: left;
    color: var(--color-text-accent);
}

/* タグリスト */
.tag-list .tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tag-link {
    display: inline-block;
    background-color: var(--color-bg-secondary);
    color: var(--color-text-primary);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    transition: background-color var(--transition-base);
}

.tag-link:hover {
    background-color: var(--color-text-primary);
    color: var(--color-bg-primary);
    opacity: 1;
}

/* アーカイブリスト */
.archive-list ul {
    list-style: none;
}

.archive-list li {
    padding: var(--spacing-xs) 0;
    border-bottom: 1px dashed var(--color-border-light);
}

.archive-list li:last-child {
    border-bottom: none;
}

.archive-list li a {
    display: block;
    color: var(--color-text-primary);
    font-size: 0.95rem;
}

/* ----- フッター ----- */
footer {
    background-color: var(--color-footer-bg);
    color: var(--color-footer-text);
    padding: 40px 0;
}

footer .footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    padding-bottom: 20px;
    margin-bottom: 20px;
}

.footer-brand {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-bg-primary);
}

.footer-nav ul {
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;
}

.footer-nav ul li {
    margin-left: 20px;
}

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

.copyright {
    text-align: center;
    font-size: 0.8rem;
    opacity: 0.7;
}

/* ========================================
   6. ページ
   ======================================== */

/* ----- ヒーローセクション ----- */
.hero {
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    text-align: center;
    padding: 120px 0;
    border-bottom: 10px solid var(--color-bg-secondary);
    position: relative;
    z-index: var(--z-base);
}

.hero .subtitle {
    font-size: var(--font-size-base);
    margin-bottom: 10px;
    letter-spacing: 0.05em;
    font-weight: 500;
}

.hero h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: 40px;
    line-height: 1.3;
    font-weight: 800;
}

/* ----- おすすめ記事 ----- */
.featured-posts {
    background-color: var(--color-bg-secondary);
    padding: 40px;
    border-radius: var(--radius-lg);
    margin: 0;
    position: relative;
    z-index: var(--z-base);
}

/* ----- 記事詳細ページ ----- */
.single-post-content {
    background-color: var(--color-bg-primary);
    padding: 40px var(--spacing-md);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
}

.single-post-header {
    position: relative;
    z-index: var(--z-base);
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px dashed var(--color-border-light);
}

.single-post-header .category {
    font-size: 0.9rem;
    margin-bottom: 10px;
}

.single-post-header h1 {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    line-height: 1.4;
    margin-bottom: var(--spacing-sm);
}

.single-post-content .post-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-accent);
}

.single-post-content .post-tags {
    margin-top: 10px;
    font-size: 0.8rem;
}

.single-post-content .post-tags a {
    display: inline-block;
    margin-right: 5px;
    background-color: var(--color-bg-secondary);
    padding: 3px var(--spacing-xs);
    border-radius: var(--radius-sm);
    font-weight: 500;
}

/* 記事本文コンテンツ */
.post-entry-content h2,
.post-entry-content h3,
.post-entry-content h4,
.post-entry-content h5,
.post-entry-content h6 {
    margin: 40px 0 var(--spacing-sm);
    line-height: 1.4;
    font-weight: 700;
}

.post-entry-content h2 {
    font-size: var(--font-size-xl);
    border-bottom: 2px solid var(--color-border-light);
    padding-bottom: 5px;
}

.post-entry-content h3 {
    font-size: 1.5rem;
    border-left: 5px solid var(--color-text-primary);
    padding-left: var(--spacing-sm);
}

.post-entry-content p {
    margin-bottom: 1.2em;
}

.post-entry-content ul,
.post-entry-content ol {
    margin: 0 0 1.5em 20px;
}

.post-entry-content li {
    margin-bottom: 0.5em;
}

.post-entry-content blockquote {
    margin: 20px 0;
    padding: var(--spacing-sm) 20px;
    border-left: 4px solid var(--color-text-accent);
    background-color: var(--color-bg-secondary);
    font-style: italic;
    color: var(--color-text-accent);
    border-radius: 0 4px 4px 0;
}

.post-entry-content pre {
    background-color: var(--color-code-bg);
    color: var(--color-code-text);
    padding: var(--spacing-sm);
    overflow-x: auto;
    border-radius: 4px;
    font-family: var(--font-family-mono);
    line-height: 1.5;
    margin-bottom: 1.5em;
}

.post-entry-content code {
    background-color: var(--color-inline-code-bg);
    padding: 2px 4px;
    border-radius: var(--radius-sm);
    font-family: var(--font-family-mono);
}

.post-entry-content pre code {
    background-color: transparent;
    padding: 0;
}

.post-entry-content img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 20px auto;
    border: 1px solid var(--color-border-light);
    border-radius: 4px;
}

/* iframeコンテナ */
.post-entry-content .iframe-container {
    position: relative;
    padding-top: 56.25%;
    height: 0;
    overflow: hidden;
    margin: 20px 0;
    max-width: 100%;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
}

.post-entry-content .iframe-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* 記事ナビゲーション */
.post-navigation {
    display: flex;
    justify-content: space-between;
    margin: 40px 0;
    padding: 20px 0;
    border-top: 1px solid var(--color-border-light);
    border-bottom: 1px solid var(--color-border-light);
}

.nav-links {
    width: 100%;
    display: flex;
    justify-content: space-between;
}

.nav-previous,
.nav-next {
    width: 49%;
}

.nav-previous a,
.nav-next a {
    display: block;
    padding: var(--spacing-sm);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    color: var(--color-text-accent);
    height: 100%;
}

.nav-previous a:hover,
.nav-next a:hover {
    background-color: var(--color-bg-hover);
    border-color: var(--color-brand);
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    opacity: 1;
}

.nav-subtitle {
    display: block;
    font-size: 0.8em;
    color: var(--color-brand);
    font-weight: bold;
    margin-bottom: 5px;
}

.nav-title {
    display: block;
    font-size: 1em;
    font-weight: 600;
    line-height: 1.4;
    color: #555;
}

.nav-previous a:hover .nav-title,
.nav-next a:hover .nav-title {
    color: var(--color-brand);
}

/* ----- Aboutページ ----- */
.about-page-content {
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    padding: 40px 20px;
    position: relative;
    z-index: var(--z-base);
}

.about-page-content .page-title {
    font-size: 2.5em;
    font-weight: bold;
    color: var(--color-text-accent);
    border-bottom: 3px solid var(--color-brand);
    padding-bottom: 10px;
    margin-bottom: 40px;
}

.about-page-content h2 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    color: var(--color-brand);
    border-bottom: 3px solid var(--color-brand);
    padding-bottom: 5px;
}

.about-page-content h3 {
    font-size: 1.3em;
    font-weight: 600;
    margin-top: 25px;
    margin-bottom: 10px;
    color: var(--color-text-accent);
}

.about-page-content .entry-content p,
.about-page-content .entry-content ul {
    line-height: 1.8;
    margin-bottom: 20px;
    color: var(--color-text-secondary);
}

.about-page-content .entry-content ul {
    list-style: disc;
    padding-left: 25px;
}

.about-page-content hr {
    border: none;
    border-top: 1px solid var(--color-border-light);
    margin: var(--spacing-md) 0;
}

.about-page-content table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 0.95em;
    border: 1px solid var(--color-border-light);
}

.about-page-content th,
.about-page-content td {
    padding: 12px var(--spacing-sm);
    text-align: left;
    border: 1px solid var(--color-border-light);
}

.about-page-content th {
    background-color: var(--color-bg-secondary);
    font-weight: bold;
    color: var(--color-text-accent);
    width: 30%;
}

.about-page-content td {
    background-color: var(--color-bg-primary);
}

/* プロフィールセクション */
.profile-intro-grid {
    display: grid;
    grid-template-columns: 0.7fr 1fr;
    gap: var(--spacing-md);
    align-items: start;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--color-border-light);
    position: relative;
    z-index: var(--z-base);
}

.profile-image-wrap {
    width: 100%;
    height: 100%;
    overflow: hidden;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    flex-shrink: 0;
}

.profile-image-wrap .profile-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.intro-text p:first-child {
    margin-top: 0;
    margin-bottom: 5px;
}

.intro-text strong span {
    font-size: 1.8em;
    color: var(--color-text-accent);
}

.intro-text h2 {
    font-size: 1.3em;
    font-weight: 700;
    margin-top: 10px;
    margin-bottom: 10px;
    color: var(--color-brand);
    border-bottom: none;
}

/* ----- Portfolioページ ----- */
.portfolio-list {
    margin-top: var(--spacing-lg);
}

.portfolio-list-heading {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin: 0 0 var(--spacing-md) 0;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--color-text-primary);
    display: block;
    width: 100%;
    text-align: left;
}

/* ポートフォリオページの背景ウォーターマーク */
.portfolio-section {
    position: relative;
    overflow: hidden;
    padding: 120px 0;
}

.portfolio-bg-watermark {
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
    display: flex;
    white-space: nowrap;
    z-index: -1;
    pointer-events: none;
    user-select: none;
    opacity: 0.1;
}

.portfolio-bg-watermark span {
    font-size: 20vw;
    font-weight: 900;
    line-height: 1;
    text-transform: uppercase;
    color: rgba(0, 0, 0, 0.5);
    padding-right: 100px;
    display: inline-block;
    animation: marquee-loop 30s linear infinite;
}

@keyframes marquee-loop {
    0% { transform: translateX(0); }
    100% { transform: translateX(-100%); }
}

/* モバイル時は背景ウォーターマークを非表示にして軽量化 */
@media (max-width: 768px) {
    .portfolio-section {
        padding: 60px 0;
    }
    
    .portfolio-bg-watermark {
        display: none;
    }
}

.portfolio-genre-title {
    font-size: var(--font-size-xl);
    font-weight: bold;
    color: var(--color-text-accent);
    margin: var(--spacing-lg) 0 var(--spacing-md);
    padding-bottom: 10px;
    border-bottom: 3px solid var(--color-text-accent);
    display: inline-block;
}

.portfolio-section:first-of-type .portfolio-genre-title {
    margin-top: 20px;
}

.single-portfolio-subtitle {
    font-size: 1.2rem;
    font-weight: bold;
    color: #555;
    margin: 10px 0 20px;
    border-bottom: 1px solid var(--color-border-light);
    padding-bottom: 10px;
}

/* ========================================
   7. ユーティリティ
   ======================================== */
.logged-in .is-hidden-post {
    opacity: 0.6;
    border: 1px dashed #ff0000;
}

/* ========================================
   8. ローディング画面
   ======================================== */
#loader-wrapper {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    display: flex;
    justify-content: center;
    align-items: center;
    visibility: visible;
}

.loader-bg-panel {
    position: absolute;
    top: 0;
    width: 50%;
    height: 100%;
    background-color: #000;
    transition: transform 0.8s cubic-bezier(0.77, 0, 0.175, 1);
    z-index: -1;
}

.loader-bg-panel.left { left: 0; }
.loader-bg-panel.right { right: 0; }

#loader-wrapper.loaded .loader-bg-panel.left {
    transform: translateX(-100%);
}

#loader-wrapper.loaded .loader-bg-panel.right {
    transform: translateX(100%);
}

#loader-wrapper.loaded .loader-content {
    opacity: 0;
    transform: translateY(-20px);
    transition: opacity var(--transition-slow), 
                transform var(--transition-slow);
}

#loader-wrapper.loaded {
    visibility: hidden;
    transition-delay: 0.8s;
}

.loader-text-wrap {
    position: relative;
    overflow: hidden;
    margin-bottom: 20px;
}

.loader-text,
.loader-text-stroke {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 900;
    letter-spacing: 0.4em;
    display: block;
    text-align: center;
    line-height: 1.2;
}

.loader-text {
    color: #fff;
    position: relative;
    z-index: 2;
    animation: text-reveal 1.2s cubic-bezier(0.77, 0, 0.175, 1);
}

.loader-text-stroke {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    color: transparent;
    -webkit-text-stroke: 1px rgba(255, 255, 255, 0.2);
    z-index: 1;
    transform: translateY(8px) translateX(4px);
}

.loader-progress-bar {
    width: 180px;
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

.loader-progress-line {
    width: 100%;
    height: 100%;
    background: #fff;
    transform: translateX(-100%);
    animation: progress-run 2s infinite;
}

.loader-status {
    color: #fff;
    font-size: 0.65rem;
    letter-spacing: 0.4em;
    margin-top: var(--spacing-sm);
    opacity: 0.5;
    text-align: center;
}

@keyframes text-reveal {
    0% {
        transform: translateY(100%);
        opacity: 0;
    }
    100% {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes progress-run {
    0% { transform: translateX(-100%); }
    50% { transform: translateX(0); }
    100% { transform: translateX(100%); }
}

/* ========================================
   9. レスポンシブデザイン
   ======================================== */

/* タブレット用ブレークポイント */
@media (max-width: 900px) {
    .single-post-header h1 {
        font-size: var(--font-size-xl);
    }
    
    .portfolio-bg-watermark span {
        font-size: 30vw;
    }
}

/* モバイル用ブレークポイント */
@media screen and (max-width: 768px) {
    /* ナビゲーション */
    .menu-toggle {
        display: block;
        z-index: calc(var(--z-overlay) + 2);
        position: relative;
    }

    #global-nav {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        z-index: var(--z-overlay);
        background: rgba(255, 255, 255, 0.98);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-slow);
        overflow-y: auto;
    }

    #global-nav.is-open {
        opacity: 1;
        visibility: visible;
    }
    
    /* メニューオープン時にbodyのスクロールを固定 */
    body.menu-active {
        overflow: hidden;
        position: fixed;
        width: 100%;
    }

    #global-nav > ul {
        flex-direction: column;
        align-items: center;
        gap: 20px;
    }

    #global-nav ul li {
        margin-left: 0;
    }

    /* モバイル用技術ナビゲーション */
    #tech-nav-mobile {
        display: block;
        max-height: 0;
        opacity: 0;
        overflow: hidden;
        transition: max-height var(--transition-base) 0.1s, 
                    opacity var(--transition-base) 0.1s;
        padding: 0 40px;
        border-top: 1px solid var(--color-border-light);
    }

    #global-nav.is-open #tech-nav-mobile {
        max-height: 500px;
        opacity: 1;
        padding-top: var(--spacing-sm);
        padding-bottom: 25px;
    }

    #tech-nav-mobile h4 {
        font-size: 1.2rem;
        font-weight: 700;
        margin-bottom: var(--spacing-sm);
        color: var(--color-text-accent);
    }

    #tech-nav-mobile ul {
        flex-direction: column;
        align-items: flex-start;
        padding: 0;
    }

    #tech-nav-mobile li {
        width: 100%;
        margin: 5px 0;
        border-bottom: 1px solid var(--color-bg-secondary);
        padding: var(--spacing-xs) 0;
    }

    #tech-nav-mobile li:last-child {
        border-bottom: none;
    }

    #tech-nav-mobile a {
        font-size: var(--font-size-base);
        color: var(--color-text-primary);
        display: block;
    }

    /* ヒーローセクション */
    .hero {
        padding: 80px 0 var(--spacing-lg);
    }

    .hero h2 {
        font-size: 1.6rem;
    }

    /* レイアウト */
    .container,
    .main-content-wrapper.container {
        width: 100%;
        padding-left: 20px;
        padding-right: 20px;
        box-sizing: border-box;
    }

    .main-content-wrapper {
        display: block;
        padding: 40px 20px;
    }

    .article-sections,
    .sidebar {
        width: 100%;
    }

    .sidebar {
        margin-top: 50px;
    }

    /* 記事グリッド */
    .post-grid {
        grid-template-columns: 1fr;
    }

    .featured-posts {
        padding: 20px;
    }

    /* 記事詳細ページ */
    .single-post-content {
        padding: 20px var(--spacing-sm);
    }

    .single-post-header h1 {
        font-size: 1.6rem;
    }

    .post-entry-content h2 {
        font-size: 1.5rem;
    }

    .post-entry-content h3 {
        font-size: 1.3rem;
    }

    /* 記事カード */
    .post-card-content {
        padding: 0 var(--spacing-sm) var(--spacing-sm);
    }

    /* ポートフォリオ - スワイプレイアウト */
    .portfolio-card-grid {
        display: flex;
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scroll-snap-type: x mandatory;
        gap: 16px;
        margin: 0 -20px var(--spacing-md) -20px;
        padding: 0 20px 20px 20px;
    }

    .portfolio-card-grid::-webkit-scrollbar {
        display: none;
    }

    .portfolio-card-item {
        flex: 0 0 82%;
        max-width: 82%;
        scroll-snap-align: center;
        margin-bottom: 0;
    }

    /* フッター */
    footer .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-brand {
        margin-bottom: var(--spacing-sm);
    }

    .footer-nav ul {
        flex-direction: column;
    }

    .footer-nav ul li {
        margin: 5px 0;
        margin-left: 0;
    }

    /* トップへ戻るボタン */
    .to-top-button {
        width: 40px;
        height: 40px;
        line-height: 40px;
        font-size: var(--font-size-xs);
        bottom: var(--spacing-sm);
        right: var(--spacing-sm);
    }

    /* 記事ナビゲーション */
    .post-navigation {
        margin: 20px 0;
        flex-direction: column;
    }

    .nav-links {
        flex-direction: column;
    }

    .nav-previous,
    .nav-next {
        width: 100%;
        margin-bottom: 10px;
    }

    .nav-previous a,
    .nav-next a {
        text-align: left;
    }

    /* Aboutページ */
    .profile-intro-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        text-align: center;
    }

    .profile-image-wrap {
        width: 200px;
        height: 200px;
        margin: 0 auto;
    }

    .intro-text h2 {
        text-align: center;
    }

    .intro-text strong span {
        font-size: 1.5em;
    }
    
    /* ポートフォリオページヘッダーのz-index調整 */
    body.menu-active .page-header,
    body.menu-active .single-post-header,
    body.menu-active .hero,
    body.menu-active .featured-posts,
    body.menu-active .about-page-content,
    body.menu-active .profile-intro-grid,
    body.menu-active .portfolio-section,
    body.menu-active .portfolio-list,
    body.menu-active .container,
    body.menu-active .main-content-wrapper {
        z-index: var(--z-base);
    }
}

/* 小型モバイル */
@media (max-width: 600px) {
    .post-navigation {
        margin: 20px 0;
    }
}