:root {
    --bg-main: #1a202c;
    --bg-card: #2d3748;
    --text-main: #e2e8f0;
    --text-muted: #a0aec0;
    --link: #63b3ed;
    --border: #4a5568;
    --ai-badge: #2b6cb0;
    --finance-badge: #2f855a;
    --ent-badge: #805ad5;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
    background: radial-gradient(circle at top right, #2d3748 0%, #1a202c 45%, #171923 100%);
    color: var(--text-main);
    line-height: 1.75;
}

.article-page {
    max-width: 900px;
    margin: 0 auto;
    padding: 24px 16px 48px;
}

.top-nav {
    margin-bottom: 18px;
}

.back-link {
    color: var(--link);
    text-decoration: none;
    font-weight: 600;
}

.back-link:hover {
    text-decoration: underline;
}

.article-card {
    background: rgba(45, 55, 72, 0.9);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 24px;
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.35);
}

.article-header {
    margin-bottom: 18px;
}

.category-badge {
    display: inline-block;
    margin-bottom: 10px;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 0.78rem;
    letter-spacing: 0.03em;
    font-weight: 700;
}

.category-ai {
    background: rgba(43, 108, 176, 0.18);
    border: 1px solid var(--ai-badge);
    color: #90cdf4;
}

.category-finance {
    background: rgba(47, 133, 90, 0.18);
    border: 1px solid var(--finance-badge);
    color: #9ae6b4;
}

.category-entertainment {
    background: rgba(128, 90, 213, 0.18);
    border: 1px solid var(--ent-badge);
    color: #d6bcfa;
}

h1 {
    margin: 0 0 12px;
    line-height: 1.35;
    font-size: 1.9rem;
}

.article-meta {
    color: var(--text-muted);
    font-size: 0.92rem;
}

.article-meta a {
    color: var(--link);
}

.article-body p {
    margin: 0 0 18px;
}

.article-footer {
    margin-top: 24px;
    padding-top: 14px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.9rem;
}

@media (max-width: 640px) {
    .article-card {
        padding: 18px;
    }

    h1 {
        font-size: 1.45rem;
    }
}