/**
 * RugBedIndex 共通スタイルシート
 * シンプルで読みやすいデザイン
 */

/* =================================
   CSS Variables
================================= */
:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-success: #16a34a;
    --color-warning: #ea580c;
    --color-danger: #dc2626;
    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-bg: #ffffff;
    --color-bg-alt: #f9fafb;
    --color-border: #e5e7eb;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Hiragino Sans", "Noto Sans JP", sans-serif;
    --max-width: 1200px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
}

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

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
}

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

a:hover {
    text-decoration: underline;
}

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

h1, h2, h3 {
    margin-top: 0;
    line-height: 1.3;
}

h1 { font-size: 1.75rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }

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

/* =================================
   Header
================================= */
.site-header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
}

.site-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.site-logo {
    font-size: 1.25rem;
    margin: 0;
}

.site-logo a {
    color: var(--color-text);
    font-weight: bold;
}

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

.site-nav a {
    color: var(--color-text);
    font-size: 0.9rem;
}

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

/* Dropdown Navigation */
.site-nav > ul > li {
    position: relative;
}

.site-nav .has-dropdown > a::after {
    content: ' ▼';
    font-size: 0.6rem;
}

.site-nav .dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    min-width: 180px;
    z-index: 100;
    flex-direction: column;
    gap: 0;
    padding: var(--spacing-sm) 0;
}

.site-nav .dropdown li {
    padding: 0;
}

.site-nav .dropdown a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    white-space: nowrap;
}

.site-nav .dropdown a:hover {
    background: var(--color-bg-alt);
    text-decoration: none;
}

.site-nav .has-dropdown:hover .dropdown {
    display: flex;
}

/* =================================
   Main Content
================================= */
.site-main {
    padding: var(--spacing-xl) 0;
    min-height: calc(100vh - 200px);
}

.site-description {
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

.update-date {
    color: var(--color-text-light);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-lg);
}

/* =================================
   Summary Section
================================= */
.summary-section {
    background: var(--color-bg-alt);
    border-radius: 8px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.summary-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.summary-item {
    text-align: center;
}

.summary-label {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
}

.summary-value {
    display: block;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--color-text);
}

/* =================================
   Product Table
================================= */
.product-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.product-table th,
.product-table td {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    vertical-align: top;
}

.product-table th {
    background: var(--color-bg-alt);
    font-weight: 600;
    white-space: nowrap;
}

.product-table tbody tr:hover {
    background: var(--color-bg-alt);
}

.col-rank {
    width: 50px;
    text-align: center;
    font-weight: bold;
}

.col-image {
    width: 80px;
}

.col-image img {
    width: 64px;
    height: 64px;
    object-fit: cover;
    border-radius: 4px;
}

.col-name {
    min-width: 200px;
}

.col-name a {
    display: block;
    margin-bottom: var(--spacing-xs);
}

.col-price,
.col-change,
.col-review,
.col-stability,
.col-score {
    white-space: nowrap;
}

.col-price small,
.col-change small,
.col-review small,
.col-stability small {
    display: block;
    color: var(--color-text-light);
    font-size: 0.8rem;
}

.col-score strong {
    font-size: 1.1rem;
    color: var(--color-primary);
}

/* Price change colors */
.price-down {
    color: var(--color-success);
}

.price-up {
    color: var(--color-danger);
}

/* Stability indicators */
.stability-good {
    color: var(--color-success);
}

.stability-warning {
    color: var(--color-warning);
}

/* =================================
   Badges
================================= */
.badge {
    display: inline-block;
    padding: 2px 6px;
    font-size: 0.75rem;
    border-radius: 4px;
    margin-left: var(--spacing-xs);
}

.badge-free-shipping {
    background: var(--color-success);
    color: white;
}

/* =================================
   Trend Tags
================================= */
.trend-section {
    margin: var(--spacing-xl) 0;
}

.trend-tags-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.trend-tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    font-size: 0.85rem;
}

/* =================================
   Size Section
================================= */
.size-section {
    margin: var(--spacing-xl) 0;
}

.size-list {
    list-style: none;
    padding: 0;
    margin: var(--spacing-md) 0;
}

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

/* =================================
   AI Section
================================= */
.ai-section {
    background: var(--color-bg-alt);
    border-left: 4px solid var(--color-primary);
    padding: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
    border-radius: 0 8px 8px 0;
}

.ai-section h2 {
    margin-top: 0;
}

.ai-section ul {
    margin: var(--spacing-md) 0;
    padding-left: var(--spacing-lg);
}

.ai-section li {
    margin-bottom: var(--spacing-sm);
}

/* =================================
   Category Links
================================= */
.category-links {
    margin-bottom: var(--spacing-xl);
}

.link-list {
    list-style: none;
    padding: 0;
    margin: var(--spacing-md) 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-sm);
}

.link-list li {
    padding: 0;
}

.link-list a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    transition: background 0.2s, border-color 0.2s;
}

.link-list a:hover {
    background: white;
    border-color: var(--color-primary);
    text-decoration: none;
}

/* =================================
   Methodology Link
================================= */
.methodology-link {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

/* =================================
   Footer
================================= */
.site-footer {
    background: var(--color-bg-alt);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-xl);
}

.footer-credit {
    margin-bottom: var(--spacing-md);
}

.footer-note {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.footer-copy {
    font-size: 0.8rem;
    color: var(--color-text-light);
    margin: 0;
}

/* =================================
   Utilities
================================= */
.no-data {
    text-align: center;
    color: var(--color-text-light);
    padding: var(--spacing-xl);
}

.update-info {
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.9rem;
    margin-top: var(--spacing-xl);
}

/* =================================
   Methodology Pages
================================= */
.site-main section {
    margin-bottom: var(--spacing-xl);
}

.site-main pre {
    background: var(--color-bg-alt);
    padding: var(--spacing-md);
    border-radius: 4px;
    overflow-x: auto;
    font-size: 0.9rem;
}

/* =================================
   Responsive
================================= */
@media (max-width: 768px) {
    .site-header .container {
        flex-direction: column;
        align-items: flex-start;
    }

    .site-nav ul {
        flex-wrap: wrap;
        gap: var(--spacing-sm) var(--spacing-md);
    }

    .product-table {
        display: block;
        overflow-x: auto;
    }

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

    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.25rem; }
}

@media (max-width: 480px) {
    .summary-grid {
        grid-template-columns: 1fr 1fr;
    }

    .summary-value {
        font-size: 1.25rem;
    }

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