/* ===== Variables ===== */
:root {
    --primary-color: #2563eb;
    --accent-color: #f59e0b;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #ffffff;
    --bg-light: #f9fafb;
    --border-color: #e5e7eb;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --radius-lg: 12px;
    --max-width: 1200px;
    --font-family: 'Noto Sans JP', sans-serif;
}

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

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
}

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

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

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

/* ===== Container ===== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===== Header ===== */
.site-header {
    background-color: var(--bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-color);
}

.logo-icon {
    font-size: 1.5rem;
}

.main-nav {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.2s;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, #1e40af 100%);
    color: white;
    padding: 3rem 0;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 2.25rem;
    font-weight: 900;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.hero-icon {
    font-size: 2.5rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: rgba(255, 255, 255, 0.95);
}

.hero-description {
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 1.5rem;
    color: rgba(255, 255, 255, 0.9);
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: var(--radius);
    transition: all 0.2s;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: #d97706;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: white;
    color: var(--primary-color);
    border: 2px solid white;
}

.btn-secondary:hover {
    background-color: transparent;
    color: white;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

/* ===== Sections ===== */
section {
    padding: 3rem 0;
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-align: center;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.section-link {
    color: var(--primary-color);
    font-weight: 600;
}

/* ===== Features ===== */
.features {
    background-color: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
}

.feature-card {
    background-color: white;
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--text-light);
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
    line-height: 1.5;
}

.roi-example {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    flex-wrap: wrap;
    margin-top: 0.75rem;
    padding: 0.75rem;
    background-color: var(--bg-light);
    border-radius: var(--radius);
}

.roi-label {
    font-size: 0.75rem;
    color: var(--text-light);
}

.roi-value {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-color);
}

.roi-value.highlight {
    color: var(--accent-color);
    font-size: 1.1rem;
}

.roi-arrow {
    font-size: 1.1rem;
    color: var(--primary-color);
}

/* ===== Posts Grid ===== */
.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
}

.post-card {
    background-color: white;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.post-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.post-image {
    width: 100%;
    height: 140px;
    background-size: cover;
    background-position: center;
    background-color: var(--bg-light);
}

.post-content {
    padding: 1rem;
}

.post-date {
    font-size: 0.75rem;
    color: var(--text-light);
    display: block;
    margin-bottom: 0.4rem;
}

.post-tags {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
    margin-bottom: 0.4rem;
}

.tag {
    font-size: 0.7rem;
    padding: 0.2rem 0.6rem;
    background-color: var(--bg-light);
    color: var(--primary-color);
    border-radius: 999px;
    font-weight: 500;
}

.post-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

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

.post-title a:hover {
    color: var(--primary-color);
}

.post-excerpt {
    color: var(--text-light);
    margin-bottom: 0.75rem;
    line-height: 1.5;
    font-size: 0.875rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.post-link {
    color: var(--primary-color);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    font-size: 0.875rem;
}

/* ===== Products Grid ===== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
}

.product-card {
    background-color: white;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.product-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.product-image {
    width: 100%;
    height: 140px;
    background-size: cover;
    background-position: center;
    background-color: var(--bg-light);
}

.product-content {
    padding: 1rem;
}

.product-category {
    font-size: 0.7rem;
    padding: 0.2rem 0.6rem;
    background-color: var(--primary-color);
    color: white;
    border-radius: 999px;
    display: inline-block;
    margin-bottom: 0.5rem;
}

.product-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.product-description {
    color: var(--text-light);
    margin-bottom: 0.75rem;
    line-height: 1.5;
    font-size: 0.875rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.product-price {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 0.75rem;
}

.product-features {
    list-style: none;
    margin-bottom: 0.75rem;
    display: none;
}

.product-features li {
    padding: 0.4rem 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.8rem;
}

.product-features li:before {
    content: "✓ ";
    color: var(--primary-color);
    font-weight: 700;
}

.product-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.product-actions .btn {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* ===== Cases Grid ===== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.25rem;
}

.case-card {
    background-color: white;
    border-radius: var(--radius);
    padding: 1rem;
    box-shadow: var(--shadow);
    transition: transform 0.2s, box-shadow 0.2s;
}

.case-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.case-industry {
    font-size: 0.7rem;
    padding: 0.2rem 0.6rem;
    background-color: var(--bg-light);
    color: var(--primary-color);
    border-radius: 999px;
    display: inline-block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.case-title {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    line-height: 1.4;
}

.case-title a {
    color: var(--text-color);
}

.case-title a:hover {
    color: var(--primary-color);
}

.case-excerpt {
    color: var(--text-light);
    margin-bottom: 0.75rem;
    line-height: 1.5;
    font-size: 0.875rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.case-results {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
    padding: 0.75rem;
    background-color: var(--bg-light);
    border-radius: var(--radius);
}

.case-result {
    flex: 1;
    text-align: center;
}

.result-label {
    font-size: 0.7rem;
    color: var(--text-light);
    display: block;
    margin-bottom: 0.25rem;
}

.result-value {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-color);
}

.result-value.highlight {
    color: var(--accent-color);
    font-size: 1.1rem;
}

.case-link {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 0.875rem;
}

/* ===== CTA Section ===== */
.cta {
    background: linear-gradient(135deg, var(--primary-color) 0%, #1e40af 100%);
    color: white;
    text-align: center;
}

.cta-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.cta-text {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: rgba(255, 255, 255, 0.9);
}

/* ===== Blog Post ===== */
.blog-post {
    background-color: var(--bg-light);
}

.post-header {
    background-color: white;
    padding: 3rem 0;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.post-header .post-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.post-meta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    color: var(--text-light);
    font-size: 0.875rem;
}

.post-featured-image {
    width: 100%;
    max-height: 500px;
    overflow: hidden;
    background-color: var(--bg-light);
}

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

.post-body {
    padding: 3rem 0;
}

.post-content {
    max-width: 800px;
    margin: 0 auto;
    background-color: white;
    padding: 3rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.post-content h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 2rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 3px solid var(--primary-color);
}

.post-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 1.5rem 0 1rem;
}

.post-content p {
    margin-bottom: 1.5rem;
}

.post-content ul,
.post-content ol {
    margin-bottom: 1.5rem;
    padding-left: 2rem;
}

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

.post-cta,
.post-note {
    margin-top: 2rem;
    padding: 1.5rem;
    background-color: var(--bg-light);
    border-radius: var(--radius);
    border-left: 4px solid var(--accent-color);
}

.post-cta h3 {
    margin-top: 0;
}

.post-footer {
    background-color: white;
    padding: 2rem 0;
}

.post-nav {
    display: flex;
    gap: 2rem;
    justify-content: space-between;
}

.post-nav a {
    flex: 1;
    padding: 1rem;
    background-color: var(--bg-light);
    border-radius: var(--radius);
    transition: background-color 0.2s;
}

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

.nav-label {
    font-size: 0.875rem;
    color: var(--text-light);
    display: block;
    margin-bottom: 0.5rem;
}

.nav-title {
    font-weight: 600;
    color: var(--text-color);
}

/* ===== Page Header ===== */
.page-header {
    background-color: var(--bg-light);
    padding: 3rem 0;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.page-description {
    font-size: 1.125rem;
    color: var(--text-light);
}

/* ===== Footer ===== */
.site-footer {
    background-color: var(--text-color);
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.7);
}

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

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

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

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

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

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

.footer-copyright {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    .main-nav {
        gap: 1rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-cta {
        flex-direction: column;
    }

    .features-grid,
    .posts-grid,
    .products-grid,
    .cases-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

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

    .post-content {
        padding: 1.5rem;
    }

    .section-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }
}