/* ========================================
   Article Pages — QIRA Blog
   ======================================== */

/* Article Header */
.article-header {
    padding-top: 140px;
    padding-bottom: 64px;
    border-bottom: 1px solid var(--color-border-light);
}

.article-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    transition: var(--transition);
    margin-bottom: 32px;
}

.article-back:hover {
    color: var(--color-accent);
}

.article-meta-top {
    display: flex;
    gap: 8px;
    margin-bottom: 20px;
}

.article-tag {
    font-size: 0.6875rem;
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 4px 12px;
    background: var(--color-accent-glow);
    color: var(--color-accent);
    border-radius: 4px;
}

.article-title {
    font-size: clamp(2rem, 5vw, 3.25rem);
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
    max-width: 800px;
    background: linear-gradient(135deg, #e8e8ed 0%, #e8e8ed 70%, #818cf8 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.article-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    max-width: 700px;
    line-height: 1.6;
    margin-bottom: 24px;
}

.article-info {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.article-authors {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text);
}

.article-separator {
    color: var(--color-text-tertiary);
}

.article-org,
.article-date {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* Article Body */
.article-body {
    padding: 80px 0;
}

.article-container {
    max-width: 760px;
}

/* Abstract */
.article-abstract {
    padding: 32px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border-light);
    border-left: 3px solid var(--color-accent);
    border-radius: var(--radius-sm);
    margin-bottom: 56px;
}

.article-abstract h3 {
    font-size: 0.875rem;
    font-family: var(--font-mono);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: 16px;
}

.article-abstract p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.8;
}

/* Sections */
.article-section {
    margin-bottom: 48px;
}

.article-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 20px;
    color: var(--color-text);
}

.section-num {
    font-family: var(--font-mono);
    color: var(--color-accent);
    margin-right: 8px;
    font-weight: 500;
}

.article-section p {
    color: var(--color-text-secondary);
    font-size: 1rem;
    line-height: 1.85;
    margin-bottom: 16px;
}

.article-section p:last-child {
    margin-bottom: 0;
}

.article-section strong {
    color: var(--color-text);
    font-weight: 600;
}

.article-section sup {
    font-size: 0.7em;
    line-height: 0;
}

/* Tables */
.article-table-wrap {
    overflow-x: auto;
    margin: 24px 0;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-sm);
}

.article-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.article-table thead {
    background: var(--color-bg-card);
}

.article-table th {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 600;
    text-align: left;
    padding: 12px 16px;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
    white-space: nowrap;
}

.article-table td {
    padding: 10px 16px;
    color: var(--color-text-secondary);
    border-bottom: 1px solid var(--color-border-light);
    white-space: nowrap;
}

.article-table td:first-child {
    font-weight: 500;
    color: var(--color-text);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
}

.article-table tbody tr:last-child td {
    border-bottom: none;
}

.article-table tbody tr:hover {
    background: rgba(99, 102, 241, 0.03);
}

/* Footer Meta */
.article-footer-meta {
    margin-top: 64px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.article-footer-meta p {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    font-style: italic;
}

/* Responsive */
@media (max-width: 968px) {
    .article-header {
        padding-top: 120px;
        padding-bottom: 48px;
    }

    .article-body {
        padding: 56px 0;
    }

    .article-abstract {
        padding: 24px;
    }
}

@media (max-width: 480px) {
    .article-title {
        font-size: 1.75rem;
    }

    .article-subtitle {
        font-size: 1.0625rem;
    }

    .article-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .article-separator {
        display: none;
    }

    .article-footer-meta {
        flex-direction: column;
        gap: 16px;
        align-items: flex-start;
    }

    .article-table {
        font-size: 0.8125rem;
    }

    .article-table th,
    .article-table td {
        padding: 8px 12px;
    }
}