:root {
    --color-bg: #F8F9FA;
    --color-surface: #FFFFFF;
    --color-text-primary: #212529;
    --color-text-secondary: #6C757D;
    --color-text-tertiary: #ADB5BD;
    --color-primary: #059669;
    --color-primary-dark: #047857;
    --color-border: #DEE2E6;
    --font-family: 'Noto Sans JP', sans-serif;
    --header-height: 60px;
}

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

body {
    font-family: var(--font-family);
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    line-height: 1.6;
}

a {
    color: inherit;
    text-decoration: none;
    cursor: pointer;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: white;
    border-bottom: 1px solid var(--color-border);
    height: var(--header-height);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.125rem;
    font-weight: 700;
}

.logo-icon {
    color: var(--color-primary);
    font-size: 1.25rem;
}

.site-nav ul {
    display: flex;
    gap: 1.5rem;
    list-style: none;
}

.site-nav a {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.site-nav a:hover {
    color: var(--color-primary);
}

/* Hero */
.hero {
    position: relative;
    background-image: url('https://images.unsplash.com/photo-1444464666168-49d633b86797?auto=format&fit=crop&w=2000&q=80');
    background-size: cover;
    background-position: center;
    padding: 5rem 0;
    min-height: 600px;
    display: flex;
    align-items: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
}

.hero-content {
    position: relative;
    z-index: 2;
    color: white;
}

.hero-pretitle {
    font-size: 0.875rem;
    margin-bottom: 0.75rem;
    opacity: 0.9;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
}

/* Main Section */
.main-section {
    padding: 3rem 0;
}

.category-section-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

/* Category List - Simple */
.category-list-simple {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.category-item-simple {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem;
    background: white;
    border-radius: 0.5rem;
    transition: all 0.2s;
}

.category-item-simple:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.category-image {
    width: 80px;
    height: 80px;
    border-radius: 0.375rem;
    overflow: hidden;
    flex-shrink: 0;
}

.category-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.category-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.category-count {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

/* Filter */
.filter-section {
    margin-bottom: 2rem;
}

.filter-bar {
    display: flex;
    gap: 0.5rem;
    border-bottom: 1px solid var(--color-border);
}

.filter-btn {
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
}

.filter-btn.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    font-weight: 600;
}

/* Article Grid */
.article-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem 1.25rem;
}

.article-card {
    display: flex;
    flex-direction: column;
    cursor: pointer;
}

.article-card:hover .card-title {
    color: var(--color-primary);
}

.card-image {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    border-radius: 0.5rem;
    margin-bottom: 0.75rem;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s;
}

.article-card:hover .card-image img {
    transform: scale(1.05);
}

.card-badge {
    position: absolute;
    top: 0.5rem;
    left: 0.5rem;
    padding: 0.25rem 0.5rem;
    background: white;
    border-radius: 0.25rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-primary);
}

.card-meta {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-size: 0.75rem;
    color: var(--color-text-tertiary);
}

.card-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    line-height: 1.3;
    transition: color 0.2s;
}

.card-excerpt {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Footer */
.site-footer {
    background: #3A3A3A;
    color: white;
    padding: 3rem 0 1.5rem;
    margin-top: 4rem;
}

.footer-top {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-description {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.75rem;
}

/* Category Page */
.category-hero {
    background: white;
    padding: 2rem 0;
    border-bottom: 1px solid var(--color-border);
}

.breadcrumb {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-bottom: 1rem;
}

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

.category-hero-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.category-hero-description {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.sub-category-nav {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 2rem;
    padding: 1rem 0;
    overflow-x: auto;
}

.sub-category-btn {
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 2rem;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.2s;
}

.sub-category-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.sub-category-btn.active {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

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

@media (max-width: 768px) {
    .site-nav {
        display: none;
    }
    .hero {
        padding: 4rem 0;
        min-height: 400px;
    }
    .hero-title {
        font-size: 1.875rem;
    }
    .category-list-simple {
        grid-template-columns: 1fr;
    }
    .category-hero-title {
        font-size: 1.5rem;
    }
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .article-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem 0.75rem;
    }
    .card-title {
        font-size: 0.875rem;
    }
    .card-excerpt {
        display: none;
    }
}

/* Footer 修正 */
.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.footer-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-col h3,
.footer-col h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: white;
}

.footer-about p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    line-height: 1.6;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    text-decoration: none;
    transition: color 0.2s;
}

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

@media (max-width: 768px) {
    .footer-row {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
}