/* Shared styles for LearnIQ study-guide articles and content pages */

.article-crumbs {
    font-size: 0.8rem;
    color: #94a3b8;
    margin: 4px 0 18px;
    font-weight: 600;
}
.article-crumbs a { color: #2563eb; text-decoration: none; }
.article-crumbs a:hover { text-decoration: underline; }
.article-crumbs span { margin: 0 6px; color: #cbd5e1; }

.article-body {
    background: var(--panel, #fff);
    border: 1px solid rgba(255, 255, 255, 0.75);
    border-radius: 26px;
    box-shadow: 0 10px 30px rgba(16, 31, 53, 0.08);
    backdrop-filter: blur(16px);
    padding: 40px 44px;
    max-width: 820px;
    margin: 0 auto;
}

.article-tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    background: rgba(37, 99, 235, 0.1);
    color: #2563eb;
    margin-bottom: 14px;
}

.article-body h1 {
    font-family: 'DM Serif Display', serif;
    font-size: clamp(1.6rem, 3.5vw, 2.4rem);
    color: #0d1b2a;
    line-height: 1.2;
    margin: 0 0 12px;
}

.article-meta {
    color: #94a3b8;
    font-size: 0.85rem;
    font-weight: 600;
    margin: 0 0 24px;
}

.article-lead {
    font-size: 1.05rem;
    line-height: 1.8;
    color: #334155;
    font-weight: 500;
    margin: 0 0 28px;
}

.article-body h2 {
    font-family: 'DM Serif Display', serif;
    font-size: clamp(1.3rem, 2.6vw, 1.65rem);
    color: #0d1b2a;
    margin: 34px 0 12px;
    line-height: 1.3;
}

.article-body h3 {
    font-weight: 800;
    font-size: 1.08rem;
    color: #0d1b2a;
    margin: 24px 0 8px;
}

.article-body p {
    color: #475569;
    font-size: 0.98rem;
    line-height: 1.85;
    margin: 0 0 16px;
}

.article-body ul,
.article-body ol {
    color: #475569;
    font-size: 0.98rem;
    line-height: 1.8;
    padding-left: 22px;
    margin: 0 0 18px;
}
.article-body li { margin-bottom: 8px; }

.article-body a { color: #2563eb; font-weight: 600; }

.article-formula {
    background: #f1f5f9;
    border-left: 4px solid #2563eb;
    border-radius: 10px;
    padding: 14px 20px;
    font-size: 1.15rem;
    font-weight: 800;
    color: #0d1b2a;
    text-align: center;
    letter-spacing: 0.02em;
}

.article-table {
    width: 100%;
    border-collapse: collapse;
    margin: 0 0 20px;
    font-size: 0.92rem;
}
.article-table th,
.article-table td {
    border: 1px solid #e2e8f0;
    padding: 10px 14px;
    text-align: left;
    color: #475569;
}
.article-table th {
    background: #f8fafc;
    color: #0d1b2a;
    font-weight: 800;
}

.article-callout {
    background: rgba(37, 99, 235, 0.06);
    border: 1px solid rgba(37, 99, 235, 0.18);
    border-radius: 16px;
    padding: 18px 22px;
    color: #334155;
    font-size: 0.95rem;
    line-height: 1.7;
    margin: 26px 0;
}
.article-callout strong { color: #0d1b2a; }

/* Article index / listing grid */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}
.article-card {
    background: var(--panel, #fff);
    border: 1px solid rgba(255, 255, 255, 0.75);
    border-radius: 22px;
    padding: 26px;
    box-shadow: 0 10px 30px rgba(16, 31, 53, 0.08);
    backdrop-filter: blur(16px);
    transition: transform 0.2s, box-shadow 0.2s;
    text-decoration: none;
    display: block;
    color: inherit;
}
.article-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 24px 70px rgba(16, 31, 53, 0.12);
    color: inherit;
}
.article-card .tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 999px;
    font-size: 0.66rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    background: rgba(37, 99, 235, 0.1);
    color: #2563eb;
    margin-bottom: 10px;
}
.article-card h3 {
    font-weight: 800;
    font-size: 1.05rem;
    color: #0d1b2a;
    line-height: 1.4;
    margin: 0 0 8px;
}
.article-card p {
    color: #607086;
    font-size: 0.88rem;
    line-height: 1.6;
    margin: 0;
}
.article-card .read {
    display: inline-block;
    margin-top: 12px;
    color: #2563eb;
    font-weight: 700;
    font-size: 0.84rem;
}

@media (max-width: 575px) {
    .article-body { padding: 26px 20px; border-radius: 20px; }
}