:root {
    --color-bg: #fcfbf9;
    /* Warm off-white */
    --color-white: #ffffff;
    --color-header: #8da399;
    /* Unitajin Sage Green */
    --color-header-search: #f0e6d2;
    /* Soft Beige */
    --color-link: #594a4e;
    /* Dark Warm Gray */
    --color-link-hover: #b08d79;
    /* Accent Brown */
    --color-text: #594a4e;
    --color-text-secondary: #888888;
    --color-btn-primary: #b08d79;
    /* Earthy Accent */
    --color-btn-hover: #9e7d6b;
    --font-main: 'Zen Maru Gothic', sans-serif;
    /* Back to original font */
    --width-sidebar: 260px;
    --radius-soft: 12px;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    font-size: 15px;
    /* Slightly larger for reading */
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: var(--color-link);
    transition: color 0.3s ease;
}

a:hover {
    color: var(--color-link-hover);
    text-decoration: none;
}

/* Header */
.amazon-header {
    background-color: rgba(255, 255, 255, 0.95);
    border-bottom: 2px solid var(--color-header);
    color: var(--color-text);
    padding: 15px 30px;
    display: flex;
    align-items: center;
    gap: 30px;
    position: sticky;
    top: 0;
    z-index: 1000;
    height: 80px;
    backdrop-filter: blur(10px);
}

.brand-logo {
    color: var(--color-header);
    font-size: 28px;
    font-weight: 700;
    letter-spacing: 0.05em;
    display: flex;
    align-items: center;
}

.brand-logo:hover {
    opacity: 0.8;
    border: none;
    margin: 0;
}

.header-desc {
    margin-left: 20px;
    font-size: 14px;
    color: var(--color-text-secondary);
    font-weight: 500;
    display: inline-block;
}

.header-right {
    display: flex;
    gap: 25px;
    align-items: center;
    margin-left: auto;
    /* Push right */
}

.nav-link {
    color: var(--color-text);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 5px 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background-color: var(--color-accent);
    transition: width 0.3s ease;
}

.nav-link:hover {
    color: var(--color-link-hover);
    border: none;
    margin: 0;
}

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

.cart-icon {
    display: none;
    /* Hide cart for magazine feel */
}

/* Layout */
.main-layout {
    display: flex;
    max-width: 1400px;
    margin: 0 auto;
    padding: 40px 20px;
    gap: 40px;
}

/* Sidebar */
.sidebar {
    width: var(--width-sidebar);
    flex-shrink: 0;
}

.sidebar-section {
    background-color: transparent;
    /* Clean look */
    padding: 0;
    margin-bottom: 40px;
    border: none;
    box-shadow: none;
}

.sidebar-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--color-header);
    /* Use Sage Green for headers */
    padding-bottom: 10px;
    border-bottom: 2px solid rgba(141, 163, 153, 0.3);
}

.author-toggle-btn {
    display: none;
}

.sidebar-list li {
    padding: 10px 15px;
    margin-bottom: 5px;
    border-radius: 8px;
    cursor: pointer;
    color: var(--color-text);
    transition: all 0.2s ease;
}

.sidebar-list li:hover {
    background-color: rgba(176, 141, 121, 0.1);
    color: var(--color-link-hover);
    transform: translateX(5px);
}

.sidebar-list li.active {
    background-color: var(--color-header);
    color: var(--color-white);
    font-weight: 500;
}

.sidebar-author-row {
    padding: 8px 10px;
    border-radius: 30px;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.sidebar-author-row:hover {
    background-color: rgba(141, 163, 153, 0.1);
}

.sidebar-author-img-circle {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.sidebar-author-img-circle.placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: bold;
    font-size: 14px;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
}

/* Recommendation Banner */
.recommendation-banner {
    background-color: var(--color-white);
    padding: 30px;
    margin-bottom: 40px;
    display: flex;
    gap: 30px;
    border: none;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(141, 163, 153, 0.15);
    /* Soft sage shadow */
    max-height: 400px;
    overflow: visible;
    align-items: center;
}

.rec-badge {
    /* Removed or hidden as per new design */
    display: none;
}

.rec-img {
    width: 250px;
    height: 180px;
    object-fit: cover;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.rec-info {
    flex-grow: 1;
}

.rec-title {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--color-text);
    line-height: 1.4;
}

.rec-meta {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 15px;
    display: flex;
    gap: 15px;
    align-items: center;
}

.rec-btn {
    background-color: var(--color-header);
    color: white;
    padding: 12px 30px;
    border: none;
    box-shadow: 0 5px 15px rgba(141, 163, 153, 0.4);
    font-weight: 500;
    letter-spacing: 0.05em;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.rec-btn:hover {
    background-color: #7b8f86;
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(141, 163, 153, 0.6);
}

/* Results Header */
.results-header {
    background: transparent;
    border: none;
    padding: 0 0 20px 0;
    border-bottom: 2px solid #eee;
    margin-bottom: 30px;
    align-items: center;
    display: flex;
    gap: 15px;
}

.results-header h2 {
    font-size: 24px;
    color: var(--color-text);
    margin: 0;
}

.results-count {
    color: var(--color-text-secondary);
    font-size: 14px;
}

/* Grid & Cards */
.amazon-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 30px;
}

.article-card {
    background-color: var(--color-white);
    border: none;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.03);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
}

.card-img-container {
    height: 180px;
    background-color: #fafafa;
    border-bottom: none;
    padding: 0;
    border-radius: 15px 15px 0 0;
    overflow: hidden;
}

.card-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    /* Back to cover for magazine feel */
    transition: transform 0.5s ease;
}

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

.card-body {
    padding: 20px;
    justify-content: space-between;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.card-title {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.5;
    margin-bottom: 10px;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    overflow: hidden;
    color: var(--color-text);
}

.card-title:hover {
    color: var(--color-header);
    /* Sage hover */
}

.card-author {
    color: var(--color-accent);
    font-weight: 500;
    font-size: 13px;
    margin-bottom: 10px;
}

.price-row,
.rating-mock,
.prime-mock {
    display: none;
    /* Hide commercial info */
}

.card-btn {
    margin-top: auto;
    background-color: transparent;
    border: 2px solid var(--color-header);
    color: var(--color-header) !important;
    padding: 8px 15px;
    border-radius: 25px;
    font-weight: 500;
    transition: all 0.3s;
    text-align: center;
    text-decoration: none !important;
    display: inline-block;
    cursor: pointer;
}

.card-btn:hover {
    background-color: var(--color-header);
    color: white !important;
}

/* Footer */
.amazon-footer {
    background-color: white;
    color: var(--color-text);
    border-top: 1px solid #eee;
    margin-top: 80px;
}

.footer-top {
    background-color: var(--color-header);
    color: white;
    cursor: pointer;
    transition: background 0.3s;
    text-align: center;
    padding: 15px;
}

.footer-top:hover {
    background-color: #7b8f86;
}

.footer-content {
    border-bottom: 1px solid #eee;
    padding: 40px;
    display: flex;
    justify-content: center;
    gap: 100px;
}

.footer-col {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col h3 {
    color: var(--color-header);
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 5px;
}

.footer-col a {
    color: var(--color-text-secondary);
    font-size: 13px;
}

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

.footer-bottom {
    background: transparent;
    border: none;
    color: #999;
    padding: 20px;
    text-align: center;
    font-size: 12px;
}

@media (max-width: 768px) {
    .main-layout {
        flex-direction: column;
        padding: 20px 15px;
        gap: 30px;
    }

    /* Move sidebar to top on mobile */
    .sidebar {
        display: block;
        width: 100%;
        order: 1;
    }

    .main-content {
        order: 2;
    }

    /* Header adjustments */
    .amazon-header {
        flex-direction: row;
        justify-content: space-between;
        height: 60px;
        padding: 10px 15px;
    }

    .brand-logo {
        font-size: 20px;
    }

    .header-desc {
        display: none;
    }

    .header-right {
        gap: 15px;
    }

    .nav-link {
        font-size: 13px;
    }

    /* Recommendation Banner Mobile */
    .recommendation-banner {
        flex-direction: column;
        padding: 20px;
        max-height: none;
        gap: 20px;
        text-align: center;
    }

    .rec-img {
        width: 100%;
        height: 200px;
        max-width: 300px;
        margin: 0 auto;
    }

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

    .rec-meta {
        justify-content: center;
        flex-wrap: wrap;
    }

    /* Sidebar adjustments for mobile */
    .author-title {
        display: none;
    }

    .concept-section {
        display: none;
    }

    .sidebar-section.author-section {
        margin-bottom: 20px;
        text-align: center;
    }

    .author-toggle-btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        width: auto;
        min-width: 220px;
        max-width: 100%;
        margin: 0 auto;
        padding: 10px 24px;
        background-color: var(--color-white);
        color: var(--color-header);
        border: 2px solid var(--color-header);
        border-radius: 30px;
        font-family: var(--font-main);
        font-size: 14px;
        font-weight: 700;
        cursor: pointer;
        transition: all 0.25s ease;
        box-shadow: 0 4px 12px rgba(141, 163, 153, 0.18);
    }

    .author-toggle-btn:hover,
    .author-toggle-btn:active {
        background-color: var(--color-header);
        color: var(--color-white);
    }

    .author-toggle-btn .toggle-icon {
        font-size: 11px;
        transition: transform 0.25s ease;
        display: inline-block;
    }

    .author-toggle-btn.is-open .toggle-icon {
        transform: rotate(180deg);
    }

    .author-toggle-btn.is-open {
        background-color: var(--color-header);
        color: var(--color-white);
    }

    /* 執筆者一覧は初期状態で非表示、ボタン押下で開閉 */
    .sidebar-authors {
        display: none;
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
        margin-top: 15px;
        padding: 15px 10px;
        background-color: rgba(255, 255, 255, 0.7);
        border-radius: 16px;
        border: 1px dashed rgba(141, 163, 153, 0.4);
        animation: fadeIn 0.25s ease;
    }

    .sidebar-authors.is-open {
        display: flex;
    }

    @keyframes fadeIn {
        from {
            opacity: 0;
            transform: translateY(-6px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }

    .sidebar-author-row {
        background-color: white;
        border: 1px solid #eee;
    }

    /* Footer */
    .footer-content {
        flex-direction: column;
        gap: 30px;
        padding: 30px 20px;
        text-align: center;
    }

    .amazon-grid {
        gap: 20px;
    }
}