/* === Base === */
:root {
    --brand: #2c3e6b;
    --brand-light: #3d5a99;
    --brand-bg: #f0f2f8;
    --text: #333;
    --text-light: #666;
    --border: #ddd;
    --white: #fff;
    --accent: #e74c3c;
    --success: #27ae60;
    --radius: 8px;
}

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

body {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', Meiryo, sans-serif;
    color: var(--text);
    background: #fafafa;
    line-height: 1.8;
}

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

/* === Header === */
header {
    background: var(--brand);
    color: var(--white);
    padding: 16px 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

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

header h1 {
    font-size: 1.3rem;
    font-weight: 600;
    letter-spacing: 0.05em;
}

header h1 a { color: var(--white); }
header h1 a:hover { text-decoration: none; }

header nav a {
    color: rgba(255,255,255,0.85);
    margin-left: 20px;
    font-size: 0.9rem;
}
header nav a:hover { color: var(--white); }

/* === Container === */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

/* === Article List === */
.article-list {
    margin: 40px 0;
}

.article-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 24px;
    margin-bottom: 16px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
    transition: box-shadow 0.2s;
}

.article-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.article-card h2 {
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.article-card h2 a { color: var(--text); }
.article-card h2 a:hover { color: var(--brand); }

.article-card .meta {
    font-size: 0.85rem;
    color: var(--text-light);
}

.article-card .price-badge {
    display: inline-block;
    background: var(--brand);
    color: var(--white);
    font-size: 0.8rem;
    padding: 2px 10px;
    border-radius: 12px;
    margin-left: 8px;
}

/* === Article Detail === */
.article-detail {
    background: var(--white);
    border-radius: var(--radius);
    padding: 32px;
    margin: 32px 0;
    box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

.article-detail h1 {
    font-size: 1.5rem;
    color: var(--brand);
    margin-bottom: 16px;
    line-height: 1.5;
}

/* === Block content === */
.block-content h2 {
    font-size: 1.25rem;
    color: var(--brand);
    border-bottom: 2px solid var(--brand-bg);
    padding-bottom: 8px;
    margin: 32px 0 16px;
}

.block-content h3 {
    font-size: 1.05rem;
    color: var(--brand-light);
    margin: 24px 0 12px;
}

.block-content p {
    margin-bottom: 12px;
}

.block-content blockquote {
    border-left: 4px solid var(--brand);
    background: var(--brand-bg);
    padding: 12px 16px;
    margin: 16px 0;
    border-radius: 0 var(--radius) var(--radius) 0;
}

.block-content .table-wrap {
    overflow-x: auto;
    margin: 16px 0;
}

.block-content table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.92rem;
}

.block-content th,
.block-content td {
    border: 1px solid var(--border);
    padding: 8px 12px;
    text-align: left;
}

.block-content th {
    background: var(--brand-bg);
    font-weight: 600;
    color: var(--brand);
}

.block-content ul, .block-content ol {
    margin: 12px 0;
    padding-left: 24px;
}

.block-content li {
    margin-bottom: 4px;
}

.block-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 24px 0;
}

.block-content code {
    background: var(--brand-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
}

.block-content strong {
    color: var(--brand);
}

/* === Paywall === */
.paywall {
    background: linear-gradient(135deg, var(--brand-bg) 0%, #e8eaf6 100%);
    border: 2px solid var(--brand);
    border-radius: var(--radius);
    padding: 32px;
    margin: 32px 0;
    text-align: center;
}

.paywall h3 {
    color: var(--brand);
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.paywall p {
    color: var(--text-light);
    margin-bottom: 16px;
}

.paywall .price {
    font-size: 2rem;
    font-weight: 700;
    color: var(--brand);
    margin-bottom: 4px;
}

.paywall .price-note {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 20px;
}

.paywall .premium-list {
    text-align: left;
    max-width: 360px;
    margin: 0 auto 24px;
    list-style: none;
    padding: 0;
}

.paywall .premium-list li {
    padding: 4px 0;
    font-size: 0.95rem;
}

.paywall .premium-list li::before {
    content: "\1F512 ";
}

.btn-purchase {
    display: inline-block;
    background: var(--brand);
    color: var(--white);
    font-size: 1.1rem;
    font-weight: 600;
    padding: 14px 40px;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background 0.2s;
}

.btn-purchase:hover {
    background: var(--brand-light);
    text-decoration: none;
    color: var(--white);
}

/* === Purchased badge === */
.purchased-badge {
    display: inline-block;
    background: var(--success);
    color: var(--white);
    font-size: 0.85rem;
    padding: 4px 12px;
    border-radius: 12px;
    margin-bottom: 16px;
}

/* === Footer === */
footer {
    background: var(--brand);
    color: rgba(255,255,255,0.7);
    text-align: center;
    padding: 24px;
    margin-top: 60px;
    font-size: 0.85rem;
}

/* === Responsive === */
@media (max-width: 600px) {
    .container { padding: 0 12px; }
    .article-detail { padding: 20px 16px; }
    .article-detail h1 { font-size: 1.2rem; }
    .paywall { padding: 24px 16px; }
}