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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: #F5F5F0;
    color: #1C2B4A;
    font-size: 16px;
    line-height: 1.7;
}

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

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

/* ===========================
   Variables
=========================== */
:root {
    --color-primary: #F5A623;
    --color-navy: #1C2B4A;
    --color-bg: #F5F5F0;
    --color-white: #ffffff;
    --color-text: #1C2B4A;
    --color-muted: #888888;
    --color-border: rgba(0, 0, 0, 0.08);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 12px;
    --max-width: 960px;
}

/* ===========================
   Header
=========================== */
.site-header {
    background: var(--color-primary);
    height: 56px;
    display: flex;
    align-items: center;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.site-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.site-logo img {
    height: 40px;
    width: auto;
}

.site-logo-icon {
    background: var(--color-primary);
    border-radius: var(--radius-sm);
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 12px;
    color: var(--color-navy);
}

.site-logo-text {
    color: #ffffff;
    font-size: 18px;
    font-weight: 500;
}

.header-search {
    background: rgba(255, 255, 255, 0.1);
    border: 0.5px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    padding: 6px 12px;
    display: flex;
    align-items: center;
    gap: 6px;
    color: rgba(255, 255, 255, 0.5);
    font-size: 13px;
    cursor: pointer;
}

.search-overlay {
    display: none;
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--color-navy);
    padding: 16px 24px;
    z-index: 99;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.search-overlay.active {
    display: block;
}

.search-form-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    gap: 8px;
}

.search-input {
    flex: 1;
    background: rgba(255,255,255,0.1);
    border: 0.5px solid rgba(255,255,255,0.2);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    color: #ffffff;
    font-size: 14px;
    outline: none;
}

.search-input::placeholder {
    color: rgba(255,255,255,0.4);
}

.search-button {
    background: var(--color-primary);
    border: none;
    border-radius: var(--radius-sm);
    padding: 8px 14px;
    cursor: pointer;
    color: var(--color-navy);
    display: flex;
    align-items: center;
}

/* ===========================
   Scroll Nav
=========================== */
.scroll-nav-wrapper {
    background: var(--color-navy);
    padding: 0 24px;
    border-top: 1px solid rgba(255,255,255,0.1);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}

.scroll-nav-wrapper::-webkit-scrollbar {
    display: none;
}

.scroll-nav {
    display: flex;
    list-style: none;
    gap: 0;
    white-space: nowrap;
    margin: 0;
    padding: 0;
}

.scroll-nav li a {
    display: block;
    padding: 10px 16px;
    color: rgba(255,255,255,0.7);
    font-size: 13px;
    transition: color 0.2s;
    white-space: nowrap;
}

.scroll-nav li a:hover,
.scroll-nav .current-menu-item a {
    color: var(--color-primary);
}
/* ===========================
   Layout
=========================== */
.site-main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 24px 16px;
    display: grid;
    grid-template-columns: 1fr 280px;
    gap: 24px;
}

/* ===========================
   Featured Article
=========================== */
.featured-article {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    border: 0.5px solid var(--color-border);
    overflow: hidden;
    margin-bottom: 20px;
}

.featured-thumbnail {
    position: relative;
    height: 220px;
    background: var(--color-navy);
    overflow: hidden;
}

.featured-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.85;
}

.featured-category {
    position: absolute;
    top: 12px;
    left: 12px;
    background: var(--color-primary);
    color: var(--color-navy);
    font-size: 11px;
    font-weight: 500;
    padding: 3px 10px;
    border-radius: 4px;
}

.featured-body {
    padding: 16px;
}

.featured-title {
    font-size: 18px;
    font-weight: 500;
    color: var(--color-navy);
    line-height: 1.4;
    margin-bottom: 8px;
}

.featured-meta {
    font-size: 12px;
    color: var(--color-muted);
    display: flex;
    gap: 16px;
}

/* ===========================
   Article Grid
=========================== */
.article-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
}

.article-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    border: 0.5px solid var(--color-border);
    overflow: hidden;
    transition: transform 0.2s;
}

.article-card:hover {
    transform: translateY(-2px);
}

.article-card-thumbnail {
    height: 110px;
    background: #E8EDF5;
    overflow: hidden;
}

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

.article-card-body {
    padding: 12px;
}

.article-card-category {
    font-size: 10px;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.article-card-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-navy);
    line-height: 1.4;
    margin-bottom: 6px;
}

.article-card-meta {
    font-size: 11px;
    color: var(--color-muted);
}

/* ===========================
   Sidebar
=========================== */
.site-sidebar {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.widget {
    background: var(--color-white);
    border-radius: var(--radius-md);
    border: 0.5px solid var(--color-border);
    padding: 16px;
}

.widget-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--color-navy);
    border-left: 3px solid var(--color-primary);
    padding-left: 8px;
    margin-bottom: 12px;
}

/* ===========================
   Single Article
=========================== */
.single-article {
    background: var(--color-white);
    border-radius: var(--radius-lg);
    border: 0.5px solid var(--color-border);
    padding: 40px 48px;
}

.single-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--color-navy);
    line-height: 1.4;
    letter-spacing: -0.01em;
    margin-bottom: 12px;
}

.single-meta {
    font-size: 12px;
    color: var(--color-muted);
    display: flex;
    gap: 16px;
    margin-bottom: 32px;
    padding-bottom: 20px;
    border-bottom: 0.5px solid var(--color-border);
}

.single-content {
    font-size: 16px;
    line-height: 2.0;
    color: #2a2a2a;
}

.single-content p {
    margin-bottom: 1.6rem;
}

.single-content h2 {
    font-size: 20px;
    font-weight: 700;
    color: var(--color-navy);
    margin: 3rem 0 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-navy);
}

.single-content h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--color-navy);
    margin: 2.5rem 0 0.75rem;
    padding-left: 0.75rem;
    border-left: 3px solid var(--color-primary);
}

.single-content ul,
.single-content ol {
    padding-left: 1.5rem;
    margin-bottom: 1.6rem;
}

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

.single-content blockquote {
    margin: 2rem 0;
    padding: 1rem 1.25rem;
    background: #F5F5F0;
    border-left: 3px solid var(--color-primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 14px;
    color: var(--color-muted);
    line-height: 1.8;
}

.single-content a {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}

/* ===========================
   Responsive（Single追加分）
=========================== */
@media (max-width: 768px) {
    .single-article {
        padding: 20px 18px;
    }

    .single-title {
        font-size: 20px;
    }

    .single-content {
        font-size: 15px;
    }

    .single-content h2 {
        font-size: 18px;
    }

    .single-content h3 {
        font-size: 16px;
    }
}

/* ===========================
   Footer
=========================== */
.site-footer {
    background: var(--color-navy);
    padding: 24px;
    margin-top: 40px;
}

.footer-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 12px;
}

.footer-nav {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 12px;
    padding: 0;
}

.footer-nav a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 12px;
}

.footer-nav a:hover {
    color: #ffffff;
}

.category-list {
    list-style: none;
    padding: 0;
}

.category-list li {
    padding: 6px 0;
    border-bottom: 0.5px solid var(--color-border);
    font-size: 13px;
}

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

.category-list a {
    color: var(--color-navy);
    display: flex;
    justify-content: space-between;
}

.category-list a:hover {
    color: var(--color-primary);
}

/* ===========================
   Responsive
=========================== */
@media (max-width: 768px) {
    .site-main {
        grid-template-columns: 1fr;
        padding: 16px;
    }

    .article-grid {
        grid-template-columns: 1fr;
    }

    .featured-thumbnail {
        height: 180px;
    }

    .site-sidebar {
        order: 2;
    }
}