/* ===== Base Styles ===== */
:root {
    --bg-primary: #f5f7fa;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #666666;
    --accent-blue: #2563eb;
    --accent-orange: #ea580c;
    --accent-green: #16a34a;
    --border-color: #e2e8f0;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

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

body {
    font-family: 'Segoe UI', 'Hiragino Sans', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0.8rem 0;
    font-size: 0.9rem;
}

.breadcrumb-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    color: var(--text-secondary);
}

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

.breadcrumb a:hover {
    color: var(--accent-blue);
    text-decoration: underline;
}

/* ===== Header ===== */
header {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
    padding: 2rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

header p {
    color: var(--text-secondary);
}

/* ===== Main ===== */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

section {
    margin-bottom: 2rem;
}

h2 {
    font-size: 1.4rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-blue);
}

/* ===== Filters ===== */
.filters {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.filters label {
    color: var(--text-secondary);
}

.filters select {
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
}

.filters select:focus {
    outline: none;
    border-color: var(--accent-blue);
}

#productCount {
    margin-left: auto;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===== Product List ===== */
.product-list-container {
    height: 400px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-card);
    padding: 0.5rem;
}

.product-list-item {
    display: flex;
    align-items: center;
    padding: 0.8rem 1rem;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background 0.2s;
    background: white;
}

.product-list-item:hover {
    background: #f0f9ff;
}

.list-image-link {
    display: block;
    width: 60px;
    height: 60px;
    margin-right: 1rem;
    flex-shrink: 0;
    border: 1px solid #eee;
    border-radius: 4px;
    overflow: hidden;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
}

.list-image-link img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.list-image-link .no-image {
    font-size: 0.6rem;
    color: #ccc;
    text-align: center;
}

.list-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-grow: 1;
}

.product-list-item h4 {
    font-size: 1rem;
    color: var(--text-primary);
    margin: 0;
}

.product-list-item .meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.product-list-item .price {
    font-weight: bold;
    color: var(--accent-blue);
    margin-left: 1rem;
}

/* ===== Comparison ===== */
.comparison {
    background: var(--bg-secondary);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.selectors {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.selectors label {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 0.3rem;
    font-size: 0.9rem;
}

.selectors select {
    width: 100%;
    padding: 0.6rem;
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
}

/* ===== Product Cards ===== */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.product-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

.product-card.main {
    border-left: 4px solid var(--accent-blue);
}

.product-card.compare {
    border-left: 4px solid var(--accent-orange);
}

.product-card img {
    width: 100%;
    max-height: 200px;
    object-fit: contain;
    border-radius: 8px;
    margin-bottom: 1rem;
    background: #fff;
}

.product-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.product-card .brand {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.amazon-btn {
    display: block;
    width: 100%;
    background: #FF9900;
    color: #111;
    font-weight: bold;
    text-align: center;
    text-decoration: none;
    padding: 0.8rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    transition: opacity 0.2s;
}

.amazon-btn:hover {
    opacity: 0.9;
}

.metrics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.metric {
    background: var(--bg-secondary);
    padding: 0.8rem;
    border-radius: 8px;
    text-align: center;
}

.metric .label {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.metric .value {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--accent-green);
}

.summary {
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.pros-cons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.pros h4,
.cons h4 {
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.pros h4 {
    color: var(--accent-green);
}

.cons h4 {
    color: var(--accent-orange);
}

.pros ul,
.cons ul {
    list-style: none;
    font-size: 0.9rem;
}

.pros li::before {
    content: "✓ ";
    color: var(--accent-green);
}

.cons li::before {
    content: "⚠ ";
    color: var(--accent-orange);
}

/* ===== Footer ===== */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
    border-top: 1px solid var(--border-color);
}

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

    .pros-cons {
        grid-template-columns: 1fr;
    }
}