/*
Theme Name: REPOSITORYONE
Theme URI: https://repositoryone.com
Author: Repository One Team
Author URI: https://repositoryone.com
Description: A newspaper-style WordPress theme for fashion and gadget recommendations. Designed for high-traffic content sites with focus on readability, SEO, and user engagement.
Version: 1.0.0
Requires at least: 6.0
Tested up to: 6.4
Requires PHP: 8.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: repositoryone
Tags: blog, news, magazine, two-columns, custom-header, custom-menu, custom-logo, editor-style, featured-images, sticky-post, threaded-comments, translation-ready, responsive-design
*/

/*--------------------------------------------------------------
>>> TABLE OF CONTENTS:
----------------------------------------------------------------
1.0 CSS Variables & Color Palette
2.0 Reset & Base Styles
3.0 Typography
4.0 Layout & Grid System
5.0 Header & Navigation
6.0 Breaking News Ticker
7.0 Hero Section
8.0 Article Grid & Cards
9.0 Popular & Trending Posts
10.0 Category Sections
11.0 Sidebar & Widgets
12.0 Footer
13.0 Single Post Layout
14.0 Forms & Buttons
15.0 Responsive Design
16.0 Accessibility
17.0 Performance & Loading
--------------------------------------------------------------*/

/*--------------------------------------------------------------
1.0 CSS Variables & Color Palette
--------------------------------------------------------------*/
:root {
    /* Primary Colors - Newspaper Classic */
    --color-primary: #1a1a1a;        /* Deep black for text */
    --color-secondary: #c8102e;      /* Editorial red accent */
    --color-accent: #2c5aa0;         /* Link blue */

    /* Neutral Palette */
    --color-background: #ffffff;
    --color-surface: #f8f8f8;
    --color-border: #e0e0e0;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #666666;
    --color-text-muted: #999999;

    /* Functional Colors */
    --color-success: #28a745;
    --color-warning: #ffc107;
    --color-error: #dc3545;
    --color-info: #17a2b8;

    /* Typography */
    --font-serif: "Noto Serif JP", "Yu Mincho", "YuMincho", "Hiragino Mincho ProN", "HG Mincho E", serif;
    --font-sans: "Noto Sans JP", "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", sans-serif;
    --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
    --font-display: "Montserrat", "Helvetica Neue", Arial, sans-serif;

    /* Font Sizes */
    --font-size-xs: 0.75rem;      /* 12px */
    --font-size-sm: 0.875rem;     /* 14px */
    --font-size-base: 1rem;       /* 16px */
    --font-size-lg: 1.125rem;     /* 18px */
    --font-size-xl: 1.25rem;      /* 20px */
    --font-size-2xl: 1.5rem;      /* 24px */
    --font-size-3xl: 1.875rem;    /* 30px */
    --font-size-4xl: 2.25rem;     /* 36px */
    --font-size-5xl: 3rem;        /* 48px */

    /* Spacing */
    --spacing-xs: 0.25rem;        /* 4px */
    --spacing-sm: 0.5rem;         /* 8px */
    --spacing-md: 1rem;           /* 16px */
    --spacing-lg: 1.5rem;         /* 24px */
    --spacing-xl: 2rem;           /* 32px */
    --spacing-2xl: 3rem;          /* 48px */
    --spacing-3xl: 4rem;          /* 64px */

    /* Layout */
    --container-max: 1400px;
    --content-max: 800px;
    --sidebar-width: 300px;
    --header-height: 80px;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

    /* Border Radius */
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 8px;
}

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--color-text-primary);
    background-color: var(--color-background);
    overflow-x: hidden;
}

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

figure {
    margin: 0;
}

ul, ol {
    list-style-position: inside;
}

/*--------------------------------------------------------------
3.0 Typography
--------------------------------------------------------------*/
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 700;
    line-height: 1.3;
    margin: 0 0 var(--spacing-md);
    color: var(--color-text-primary);
}

h1 {
    font-size: var(--font-size-4xl);
    letter-spacing: -0.02em;
}

h2 {
    font-size: var(--font-size-3xl);
    letter-spacing: -0.01em;
}

h3 {
    font-size: var(--font-size-2xl);
}

h4 {
    font-size: var(--font-size-xl);
}

h5 {
    font-size: var(--font-size-lg);
}

h6 {
    font-size: var(--font-size-base);
}

p {
    margin: 0 0 var(--spacing-md);
    line-height: 1.8;
}

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

a:hover {
    color: var(--color-secondary);
    text-decoration: underline;
}

strong, b {
    font-weight: 700;
}

em, i {
    font-style: italic;
}

blockquote {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-md) var(--spacing-lg);
    border-left: 4px solid var(--color-secondary);
    background-color: var(--color-surface);
    font-style: italic;
    color: var(--color-text-secondary);
}

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    padding: 2px 6px;
    background-color: var(--color-surface);
    border-radius: var(--radius-sm);
}

pre {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-md);
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    overflow-x: auto;
}

pre code {
    padding: 0;
    background: none;
}

/*--------------------------------------------------------------
3.1 Loading Screen
--------------------------------------------------------------*/
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 99999;
    transition: opacity 0.8s ease-out, visibility 0.8s ease-out;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-content {
    text-align: center;
}

.loading-logo {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-primary);
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* ローディング中はスクロール無効化 */
body.loading {
    overflow: hidden;
}

/*--------------------------------------------------------------
3.2 English Text Styling (Brand Style)
--------------------------------------------------------------*/
.english-text,
.breaking-news-label,
.sidebar-menu-title,
.section-title,
.widget-title,
.archive-title {
    font-family: var(--font-display);
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

/*--------------------------------------------------------------
4.0 Layout & Grid System
--------------------------------------------------------------*/
.site {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.site-content {
    flex: 1;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.content-wrapper {
    display: grid;
    grid-template-columns: 1fr var(--sidebar-width);
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-xl);
}

.main-content {
    min-width: 0; /* Prevents grid overflow */
}

/* Article Grid System */
.article-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.article-grid-2col {
    grid-template-columns: repeat(2, 1fr);
}

.article-grid-4col {
    grid-template-columns: repeat(4, 1fr);
}

/*--------------------------------------------------------------
5.0 Header & Navigation
--------------------------------------------------------------*/
.site-header {
    background-color: var(--color-background);
    border-bottom: 3px solid var(--color-primary);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.header-top {
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-xs) 0;
}

.header-top .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--font-size-sm);
}

.header-date {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.header-social a {
    color: white;
    margin-left: var(--spacing-sm);
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.header-social a:hover {
    opacity: 1;
    text-decoration: none;
}

.header-main {
    padding: var(--spacing-lg) 0;
    border-bottom: 2px solid var(--color-border);
}

.header-main .container {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    position: relative;
}

.header-center {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.site-branding {
    display: flex;
    align-items: center;
    justify-content: center;
}

.site-title {
    font-family: 'Montserrat', 'Helvetica Neue', Arial, sans-serif;
    font-size: 2.8125rem; /* 45px - 1.5倍 */
    font-weight: 400;
    margin: 0;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

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

.site-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: var(--spacing-xs) 0 0;
}

.main-navigation ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--spacing-lg);
}

.main-navigation a {
    font-family: var(--font-serif);
    font-weight: 600;
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    padding: var(--spacing-sm) 0;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
}

.main-navigation a:hover,
.main-navigation .current-menu-item a {
    color: var(--color-secondary);
    border-bottom-color: var(--color-secondary);
    text-decoration: none;
}

/*--------------------------------------------------------------
6.0 Breaking News Ticker
--------------------------------------------------------------*/
.breaking-news {
    background: #000000;
    color: white;
    padding: var(--spacing-md) 0;
    overflow: hidden;
    position: relative;
}

.breaking-news .container {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.breaking-news-label {
    font-family: var(--font-serif);
    font-weight: 900;
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-sm);
}

.breaking-news-content {
    flex: 1;
    overflow: hidden;
}

.breaking-news-ticker {
    display: flex;
    animation: ticker 30s linear infinite;
}

.breaking-news-ticker a {
    color: white;
    white-space: nowrap;
    padding-right: var(--spacing-2xl);
    font-weight: 500;
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.breaking-news-ticker a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

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

/*--------------------------------------------------------------
7.0 Hero Section
--------------------------------------------------------------*/
.hero-section {
    margin: var(--spacing-xl) 0;
}

.hero-main {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    aspect-ratio: 16 / 9;
}

.hero-main img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.hero-main:hover img {
    transform: scale(1.05);
}

.hero-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-2xl);
    background: linear-gradient(to top, rgba(0, 0, 0, 0.95), transparent);
    color: white;
}

.hero-category {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: var(--font-size-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-secondary);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
}

.hero-title {
    font-size: var(--font-size-4xl);
    margin: var(--spacing-sm) 0;
    color: white;
}

.hero-title a {
    color: white;
    text-decoration: none;
}

.hero-title a:hover {
    color: var(--color-secondary);
}

.hero-excerpt {
    font-size: var(--font-size-lg);
    line-height: 1.6;
    margin: var(--spacing-md) 0 0;
    opacity: 0.9;
}

.hero-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
    font-size: var(--font-size-sm);
    opacity: 0.8;
}

/*--------------------------------------------------------------
7.1 Hero Slider
--------------------------------------------------------------*/
.hero-slider {
    position: relative;
    overflow: hidden;
}

.hero-slider-track {
    display: flex;
    transition: transform 0.5s ease-in-out;
}

.hero-slide {
    min-width: 100%;
    flex-shrink: 0;
}

.hero-slider-prev,
.hero-slider-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-lg);
}

.hero-slider-prev:hover,
.hero-slider-next:hover {
    background-color: var(--color-secondary);
    color: white;
    transform: translateY(-50%) scale(1.1);
}

.hero-slider-prev {
    left: var(--spacing-md);
}

.hero-slider-next {
    right: var(--spacing-md);
}

.hero-slider-dots {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    display: flex;
    gap: var(--spacing-sm);
}

.hero-slider-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid white;
    background-color: transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    padding: 0;
}

.hero-slider-dot:hover,
.hero-slider-dot.active {
    background-color: white;
}

@media (max-width: 768px) {
    .hero-slider-prev,
    .hero-slider-next {
        width: 40px;
        height: 40px;
    }

    .hero-slider-prev {
        left: var(--spacing-sm);
    }

    .hero-slider-next {
        right: var(--spacing-sm);
    }
}

/*--------------------------------------------------------------
8.0 Article Grid & Cards
--------------------------------------------------------------*/
.article-card {
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.article-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.article-thumbnail {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16 / 10;
    background-color: var(--color-surface);
}

.article-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.article-card:hover .article-thumbnail img {
    transform: scale(1.1);
}

.article-badge {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    font-size: var(--font-size-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-secondary);
    color: white;
    border-radius: var(--radius-sm);
}

.article-body {
    padding: var(--spacing-md);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.article-category {
    font-size: var(--font-size-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-xs);
}

.article-title {
    font-size: var(--font-size-lg);
    line-height: 1.4;
    margin: 0 0 var(--spacing-sm);
    flex: 1;
}

.article-title a {
    color: var(--color-text-primary);
    text-decoration: none;
}

.article-title a:hover {
    color: var(--color-secondary);
}

.article-excerpt {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin: 0 0 var(--spacing-sm);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border);
}

.article-meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

/*--------------------------------------------------------------
9.0 Popular & Trending Posts
--------------------------------------------------------------*/
.popular-posts-section {
    background-color: var(--color-surface);
    padding: var(--spacing-2xl) 0;
    margin: var(--spacing-2xl) 0;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 3px solid var(--color-primary);
}

.section-title {
    font-size: var(--font-size-3xl);
    margin: 0;
    position: relative;
}

.section-title::before {
    content: "";
    position: absolute;
    bottom: -var(--spacing-md);
    left: 0;
    width: 60px;
    height: 3px;
    background-color: var(--color-secondary);
}

.section-nav {
    display: flex;
    gap: var(--spacing-md);
}

.section-nav-btn {
    font-family: var(--font-display);
    font-size: var(--font-size-sm);
    font-weight: 400;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: var(--spacing-xs) var(--spacing-md);
    background-color: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.section-nav-btn:hover,
.section-nav-btn.active {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.popular-post-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-background);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.popular-post-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.popular-post-rank {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-serif);
    font-size: var(--font-size-xl);
    font-weight: 900;
    color: var(--color-secondary);
}

.popular-post-thumbnail {
    flex-shrink: 0;
    width: 120px;
    aspect-ratio: 16 / 10;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.popular-post-content {
    flex: 1;
    min-width: 0;
}

.popular-post-title {
    font-size: var(--font-size-base);
    line-height: 1.4;
    margin: 0 0 var(--spacing-xs);
}

/*--------------------------------------------------------------
10.0 Category Sections
--------------------------------------------------------------*/
.category-section {
    margin: var(--spacing-3xl) 0;
}

.category-showcase {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
}

.category-featured {
    grid-row: span 2;
}

/*--------------------------------------------------------------
11.0 Sidebar & Widgets
--------------------------------------------------------------*/
.widget-area {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.widget {
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
}

.widget-title {
    font-size: var(--font-size-xl);
    margin: 0 0 var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-secondary);
}

.widget ul {
    list-style: none;
    padding: 0;
}

.widget li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

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

/*--------------------------------------------------------------
12.0 Footer
--------------------------------------------------------------*/
.site-footer {
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    margin-top: var(--spacing-3xl);
}

.footer-widgets {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-widget {
    color: rgba(255, 255, 255, 0.8);
}

.footer-widget-title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-md);
    color: white;
}

.footer-widget a {
    color: rgba(255, 255, 255, 0.8);
}

.footer-widget a:hover {
    color: white;
}

.site-info {
    text-align: center;
    padding-top: var(--spacing-lg);
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
}

/*--------------------------------------------------------------
13.0 Single Post Layout
--------------------------------------------------------------*/
.single-post .entry-header {
    max-width: var(--content-max);
    margin: var(--spacing-xl) auto;
    text-align: center;
}

.single-post .entry-title {
    font-size: var(--font-size-5xl);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

.single-post .entry-meta {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin-top: var(--spacing-md);
}

.single-post .entry-meta .meta-categories a {
    color: var(--color-secondary);
    font-weight: 600;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.single-post .entry-meta .meta-categories a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

.single-post .entry-content {
    max-width: var(--content-max);
    margin: 0 auto;
    font-size: var(--font-size-lg);
    line-height: 1.9;
}

.single-post .entry-content > * + * {
    margin-top: var(--spacing-lg);
}

/*--------------------------------------------------------------
14.0 Forms & Buttons
--------------------------------------------------------------*/
.btn {
    display: inline-block;
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    font-weight: 600;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn:hover {
    background-color: var(--color-secondary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--color-surface);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-background);
}

/*--------------------------------------------------------------
15.0 Responsive Design
--------------------------------------------------------------*/
@media (max-width: 1024px) {
    :root {
        --font-size-4xl: 2rem;
        --font-size-3xl: 1.75rem;
    }

    .content-wrapper {
        grid-template-columns: 1fr;
    }

    .article-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .category-showcase {
        grid-template-columns: 1fr;
    }

    .footer-widgets {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-4xl: 1.75rem;
        --font-size-3xl: 1.5rem;
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
    }

    .main-navigation ul {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .article-grid,
    .article-grid-2col,
    .article-grid-4col {
        grid-template-columns: 1fr;
    }

    .hero-content {
        padding: var(--spacing-md);
    }

    .footer-widgets {
        grid-template-columns: 1fr;
    }

    .breaking-news-ticker {
        animation-duration: 20s;
    }
}

/*--------------------------------------------------------------
16.0 Accessibility
--------------------------------------------------------------*/
.screen-reader-text {
    clip: rect(1px, 1px, 1px, 1px);
    clip-path: inset(50%);
    height: 1px;
    width: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute;
    word-wrap: normal;
}

.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    background-color: var(--color-primary);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: 10000;
}

.skip-link:focus {
    top: 0;
}

/*--------------------------------------------------------------
17.0 Performance & Loading
--------------------------------------------------------------*/
.lazy-load {
    opacity: 0;
    transition: opacity var(--transition-base);
}

.lazy-load.loaded {
    opacity: 1;
}

/* Loading Skeleton */
.skeleton {
    background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/*--------------------------------------------------------------
18.0 Hamburger Menu & Sidebar
--------------------------------------------------------------*/
.hamburger-menu {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
    transition: transform var(--transition-fast);
    flex-shrink: 0;
}

.hamburger-menu:hover {
    transform: scale(1.1);
}

.hamburger-line {
    width: 24px;
    height: 2px;
    background-color: var(--color-primary);
    margin: 3px 0;
    transition: all var(--transition-fast);
}

.hamburger-menu:hover .hamburger-line {
    background-color: var(--color-secondary);
}

/* Category Navigation */
.category-navigation {
    display: flex;
    align-items: center;
    justify-content: center;
}

.category-menu {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    align-items: center;
}

.category-menu li {
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
}

.category-menu li:not(:last-child)::after {
    content: '|';
    margin: 0 var(--spacing-sm);
    color: var(--color-border);
    font-weight: 300;
}

.category-menu a {
    font-family: var(--font-sans);
    font-weight: 500;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
    display: block;
}

/* 英語のカテゴリ名はブランドスタイルで表示 */
.category-menu a.english-text,
.category-menu a[href*="category"] {
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.category-menu a:hover {
    color: var(--color-secondary);
}

.category-count {
    font-size: 0.65rem;
    color: var(--color-text-muted);
    font-weight: 400;
    opacity: 0.7;
}

/* Category Dropdown Menu */
.category-menu .has-dropdown {
    position: relative;
}

.category-menu .has-dropdown > a {
    display: flex;
    align-items: center;
    gap: 4px;
}

.dropdown-icon {
    transition: transform var(--transition-fast);
}

.category-menu .has-dropdown:hover .dropdown-icon {
    transform: rotate(180deg);
}

.category-dropdown {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-top: var(--spacing-sm);
    min-width: 200px;
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-xs) 0;
    list-style: none;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(-10px);
    transition: all var(--transition-fast);
    z-index: 1000;
}

.category-menu .has-dropdown:hover .category-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.category-dropdown li {
    margin: 0;
    padding: 0;
    border: none;
}

.category-dropdown li::after {
    display: none !important;
}

.category-dropdown a {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    text-transform: none;
    letter-spacing: normal;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.category-dropdown a:hover {
    background-color: var(--color-surface);
    color: var(--color-secondary);
}

.category-dropdown .category-count {
    margin-left: var(--spacing-xs);
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
}

/* Mobile: Dropdown becomes stacked on small screens */
@media (max-width: 768px) {
    .category-dropdown {
        position: static;
        transform: none;
        margin-top: 0;
        opacity: 1;
        visibility: visible;
        box-shadow: none;
        border: none;
        background-color: var(--color-surface);
        border-radius: 0;
    }

    .category-menu .has-dropdown {
        flex-direction: column;
        align-items: stretch;
    }

    .category-menu .has-dropdown > a {
        width: 100%;
    }
}

/* Sidebar Menu */
.sidebar-menu {
    position: fixed;
    top: 0;
    left: -100%;
    width: 320px;
    height: 100vh;
    z-index: 10000;
    transition: left var(--transition-base);
}

.sidebar-menu.active {
    left: 0;
}

.sidebar-menu-inner {
    position: relative;
    width: 100%;
    height: 100%;
    background-color: var(--color-background);
    box-shadow: var(--shadow-xl);
    overflow-y: auto;
    z-index: 10001;
}

.sidebar-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 9999;
}

.sidebar-menu.active .sidebar-menu-overlay {
    opacity: 1;
    visibility: visible;
}

.sidebar-menu-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    font-size: var(--font-size-3xl);
    line-height: 1;
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.sidebar-menu-close:hover {
    color: var(--color-secondary);
}

.sidebar-menu-header {
    padding: var(--spacing-2xl) var(--spacing-lg);
    border-bottom: 2px solid var(--color-border);
}

.sidebar-site-title {
    font-family: 'Montserrat', 'Helvetica Neue', Arial, sans-serif;
    font-size: var(--font-size-2xl);
    font-weight: 400;
    margin: 0;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.sidebar-site-title a {
    color: var(--color-primary);
    text-decoration: none;
}

.sidebar-menu-nav {
    padding: var(--spacing-lg);
}

.sidebar-menu-title {
    font-family: var(--font-serif);
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin: 0 0 var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-secondary);
    color: var(--color-primary);
}

.sidebar-menu-nav > ul,
.sidebar-menu-nav .children {
    list-style: none;
    margin: 0;
    padding: 0;
}

.sidebar-menu-nav .cat-item {
    margin: 0;
    border-bottom: 1px solid var(--color-border);
}

.sidebar-menu-nav .cat-item:last-child {
    border-bottom: none;
}

.sidebar-menu-nav .cat-item > a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-sm);
    color: var(--color-text-primary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

/* 親カテゴリ */
.sidebar-menu-nav .parent-category > a {
    font-weight: 600;
    font-size: var(--font-size-base);
}

/* 子カテゴリ - インデント */
.sidebar-menu-nav .child-category > a {
    padding-left: calc(var(--spacing-md) + var(--spacing-lg));
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.sidebar-menu-nav .child-category.level-1 > a {
    padding-left: calc(var(--spacing-md) + var(--spacing-lg));
}

.sidebar-menu-nav .child-category.level-2 > a {
    padding-left: calc(var(--spacing-md) + var(--spacing-2xl));
}

.sidebar-menu-nav .child-category.level-3 > a {
    padding-left: calc(var(--spacing-md) + var(--spacing-3xl));
}

/* ホバー効果 */
.sidebar-menu-nav .cat-item > a:hover {
    background-color: var(--color-surface);
    color: var(--color-secondary);
}

.sidebar-menu-nav .parent-category > a:hover {
    padding-left: var(--spacing-md);
}

.sidebar-menu-nav .child-category > a:hover {
    padding-left: calc(var(--spacing-md) + var(--spacing-lg) + var(--spacing-xs));
}

/* 子カテゴリリスト */
.sidebar-menu-nav .children {
    background-color: rgba(0, 0, 0, 0.02);
}

.sidebar-menu-nav .children .cat-item {
    border-bottom-color: rgba(0, 0, 0, 0.05);
}

/* Hero Main Link */
.hero-main-link {
    display: block;
    text-decoration: none;
    color: inherit;
}

.hero-main-link:hover {
    text-decoration: none;
}

.hero-main-link .hero-title {
    transition: color var(--transition-fast);
}

.hero-main-link:hover .hero-title {
    color: var(--color-secondary);
}

/* Header Search */
.header-search-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.header-search-toggle:hover {
    color: var(--color-secondary);
    transform: scale(1.1);
}

.header-search-form {
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    transition: all var(--transition-base);
}

.header-search-form[hidden] {
    display: none;
}

.header-search-form.active {
    display: block;
}

.search-form {
    display: flex;
    gap: var(--spacing-sm);
    max-width: 600px;
    margin: 0 auto;
}

.search-form label {
    flex: 1;
    margin: 0;
}

.search-field {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    font-family: var(--font-sans);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-background);
    transition: border-color var(--transition-fast);
}

.search-field:focus {
    outline: none;
    border-color: var(--color-secondary);
}

.search-submit {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-secondary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.search-submit:hover {
    background-color: var(--color-primary);
    transform: translateY(-2px);
}

/*--------------------------------------------------------------
19.0 Responsive - Mobile Menu
--------------------------------------------------------------*/
@media (max-width: 1200px) {
    .category-menu a {
        font-size: 0.8125rem;
    }
}

@media (max-width: 1024px) {
    .category-menu a {
        font-size: 0.75rem;
    }

    .category-menu li:not(:last-child)::after {
        margin: 0 var(--spacing-xs);
    }
}

@media (max-width: 768px) {
    .header-main {
        padding: var(--spacing-md) 0;
    }

    .header-main .container {
        gap: var(--spacing-sm);
    }

    .site-title {
        font-size: var(--font-size-xl);
    }

    .category-menu {
        flex-wrap: wrap;
        justify-content: center;
    }

    .category-menu a {
        font-size: 0.6875rem;
    }

    .hamburger-menu {
        width: 36px;
        height: 36px;
        flex-shrink: 0;
    }

    .hamburger-line {
        width: 20px;
    }

    .sidebar-menu {
        width: 85vw;
        max-width: 320px;
    }
}

@media (max-width: 480px) {
    .site-title {
        font-size: var(--font-size-lg);
    }

    .category-menu a {
        font-size: 0.625rem;
    }

    .category-menu li:not(:last-child)::after {
        margin: 0 4px;
    }
}

/*--------------------------------------------------------------
20.0 All Posts Archive Page
--------------------------------------------------------------*/
.all-posts-archive {
    padding: var(--spacing-2xl) 0;
}

.archive-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 3px solid var(--color-primary);
}

.archive-title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.archive-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin: 0;
}

.archive-controls {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    background-color: var(--color-surface);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xl);
}

.sort-controls,
.category-filter-controls {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.control-label {
    font-weight: 600;
    color: var(--color-text-primary);
    white-space: nowrap;
}

.sort-select,
.category-select {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    font-family: var(--font-sans);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-background);
    cursor: pointer;
    transition: border-color var(--transition-fast);
    min-width: 180px;
}

.sort-select:hover,
.category-select:hover,
.sort-select:focus,
.category-select:focus {
    border-color: var(--color-secondary);
    outline: none;
}

.view-toggle {
    display: flex;
    gap: var(--spacing-xs);
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-xs);
}

.view-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: transparent;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.view-btn:hover {
    background-color: var(--color-surface);
    color: var(--color-text-primary);
}

.view-btn.active {
    background-color: var(--color-primary);
    color: white;
}

.view-btn svg {
    flex-shrink: 0;
}

.posts-results-info {
    padding: var(--spacing-md) 0;
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
}

.results-count strong {
    color: var(--color-primary);
    font-weight: 700;
}

.posts-container {
    position: relative;
    min-height: 400px;
}

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

/* List View Styles */
.view-list .article-list-item {
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-base);
}

.view-list .article-list-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateX(4px);
}

.view-list .article-list-content {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
}

.view-list .article-list-thumbnail {
    flex-shrink: 0;
    width: 200px;
    height: 120px;
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.view-list .article-list-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.view-list .article-list-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.view-list .article-category {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-secondary);
}

.view-list .article-list-title {
    font-size: var(--font-size-xl);
    margin: 0;
    line-height: 1.4;
}

.view-list .article-list-title a {
    color: var(--color-text-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.view-list .article-list-title a:hover {
    color: var(--color-secondary);
}

.view-list .article-list-excerpt {
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.view-list .article-list-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    margin-top: auto;
}

/* Grid View Styles */
.view-grid .posts-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.view-grid .article-list-item {
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.view-grid .article-list-item:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.view-grid .article-list-content {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.view-grid .article-list-thumbnail {
    width: 100%;
    aspect-ratio: 16 / 10;
    overflow: hidden;
}

.view-grid .article-list-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.view-grid .article-list-body {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    flex: 1;
}

.view-grid .article-list-title {
    font-size: var(--font-size-lg);
}

/* Loading Overlay */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-secondary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* No Posts Found */
.no-posts-found {
    text-align: center;
    padding: var(--spacing-3xl);
    color: var(--color-text-secondary);
}

.no-posts-found p {
    font-size: var(--font-size-lg);
}

/* Pagination */
.archive-pagination {
    margin-top: var(--spacing-2xl);
    display: flex;
    justify-content: center;
}

.archive-pagination .page-numbers {
    display: flex;
    list-style: none;
    gap: var(--spacing-xs);
    margin: 0;
    padding: 0;
}

.archive-pagination a,
.archive-pagination span {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: var(--spacing-xs) var(--spacing-sm);
    background-color: var(--color-background);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.archive-pagination a:hover {
    background-color: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.archive-pagination .current {
    background-color: var(--color-secondary);
    color: white;
    border-color: var(--color-secondary);
}

/* Responsive */
@media (max-width: 1024px) {
    .view-grid .posts-list {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .archive-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .sort-controls,
    .category-filter-controls {
        width: 100%;
    }

    .sort-select,
    .category-select {
        flex: 1;
        min-width: 0;
    }

    .view-toggle {
        justify-content: center;
    }

    .view-list .article-list-content {
        flex-direction: column;
    }

    .view-list .article-list-thumbnail {
        width: 100%;
        height: 200px;
    }

    .view-grid .posts-list {
        grid-template-columns: 1fr;
    }
}