/* =========================================
   SubraLabs — Lab Pages
   Engineering notes & technical analyses
   ========================================= */

/* --- Lab header label --- */
.lab-header-label {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--accent);
}


/* --- Lab Hero --- */
.lab-hero {
    padding-top: calc(64px + var(--space-xl));
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--border);
}

.lab-back {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-light);
    margin-bottom: var(--space-lg);
    transition: color 0.3s var(--ease), gap 0.3s var(--ease-out);
}

.lab-back:hover {
    color: var(--text);
    gap: 0.7rem;
}

.lab-back-arrow {
    transition: transform 0.3s var(--ease-out);
}

.lab-back:hover .lab-back-arrow {
    transform: translateX(-4px);
}

.lab-title {
    font-family: var(--font-serif);
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 400;
    line-height: 1;
    letter-spacing: -0.02em;
    color: var(--text);
    margin-bottom: var(--space-md);
}

.lab-intro {
    font-size: 1.1rem;
    line-height: 1.7;
    color: var(--text-mid);
    max-width: 600px;
}


/* --- Paper cards --- */
.lab-papers {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.lab-paper {
    display: block;
    padding: var(--space-lg) 0;
    border-bottom: 1px solid var(--border);
    transition: transform 0.4s var(--ease-out);
}

.lab-paper:first-child {
    border-top: 1px solid var(--border);
}

.lab-paper:hover {
    transform: translateX(4px);
}

.lab-paper-date {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-light);
    margin-bottom: var(--space-xs);
}

.lab-paper-title {
    font-family: var(--font-serif);
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    font-weight: 400;
    line-height: 1.25;
    color: var(--text);
    margin-bottom: var(--space-sm);
    transition: color 0.3s var(--ease);
}

.lab-paper:hover .lab-paper-title {
    color: var(--accent);
}

.lab-paper-abstract {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--text-mid);
    max-width: 700px;
    margin-bottom: var(--space-sm);
}

.lab-paper-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-xs);
}

.lab-paper-tag {
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-light);
    padding: 0.3rem 0.6rem;
    border: 1px solid var(--border);
    border-radius: 2px;
}

.lab-paper-read {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    color: var(--accent);
    margin-top: var(--space-sm);
    transition: gap 0.3s var(--ease-out);
}

.lab-paper:hover .lab-paper-read {
    gap: 0.7rem;
}

.lab-empty {
    font-family: var(--font-serif);
    font-size: 1.1rem;
    font-style: italic;
    color: var(--text-light);
    text-align: center;
    padding: var(--space-xl) 0;
}


/* --- Inline article links --- */
.lab-link {
    color: var(--accent);
    position: relative;
    text-decoration: none;
    transition: color 0.35s var(--ease);
}

.lab-link::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 1px;
    background-color: var(--accent-light);
    transform: scaleX(0);
    transform-origin: right center;
    transition: transform 0.4s var(--ease-out);
}

.lab-link:hover {
    color: var(--text);
}

.lab-link:hover::after {
    transform: scaleX(1);
    transform-origin: left center;
}


/* --- Paper detail page --- */
.lab-article {
    padding-top: var(--space-lg);
    max-width: 720px;
    margin: 0 auto;
}

.lab-article-meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-md);
    border-bottom: 1px solid var(--border);
}

.lab-article-date {
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-light);
}

.lab-article-reading {
    font-size: 0.75rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-light);
}

.lab-article h2 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 400;
    line-height: 1.3;
    color: var(--text);
    margin-top: var(--space-lg);
    margin-bottom: var(--space-sm);
}

.lab-article h3 {
    font-family: var(--font-serif);
    font-size: 1.15rem;
    font-weight: 400;
    line-height: 1.4;
    color: var(--text);
    margin-top: var(--space-md);
    margin-bottom: var(--space-xs);
}

.lab-article p {
    color: var(--text-mid);
    margin-bottom: var(--space-sm);
    line-height: 1.8;
}

.lab-article p.lead {
    font-size: 1.15rem;
    line-height: 1.7;
    color: var(--text);
}

.lab-article ul,
.lab-article ol {
    color: var(--text-mid);
    margin-bottom: var(--space-sm);
    padding-left: 1.5rem;
    line-height: 1.8;
    list-style: disc;
}

.lab-article ol {
    list-style: decimal;
}

.lab-article li {
    margin-bottom: 0.4rem;
}

.lab-article blockquote {
    border-left: 2px solid var(--accent);
    padding-left: var(--space-md);
    margin: var(--space-md) 0;
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--text-mid);
}

.lab-article code {
    font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    font-size: 0.85em;
    background: var(--bg-alt);
    padding: 0.15rem 0.4rem;
    border-radius: 2px;
}

.lab-article pre {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: 2px;
    padding: var(--space-md);
    margin: var(--space-md) 0;
    overflow-x: auto;
    line-height: 1.6;
}

.lab-article pre code {
    background: none;
    padding: 0;
    font-size: 0.85rem;
}

.lab-article-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-md) 0;
    font-size: 0.9rem;
}

.lab-article-table th {
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-light);
    text-align: left;
    padding: var(--space-sm);
    border-bottom: 2px solid var(--border);
}

.lab-article-table td {
    padding: var(--space-sm);
    border-bottom: 1px solid var(--border);
    color: var(--text-mid);
}

.lab-article-table td:first-child {
    font-family: var(--font-serif);
    color: var(--text);
}

.lab-article-footnote {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: var(--space-xl);
    padding-top: var(--space-md);
    border-top: 1px solid var(--border);
    font-style: italic;
}

.lab-figure {
    margin: var(--space-lg) 0;
    padding: 0;
}

.lab-figure img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 6px;
    outline: 1px solid rgba(0, 0, 0, 0.1);
    outline-offset: -1px;
    box-shadow:
        0 2px 8px -2px rgba(0, 0, 0, 0.08),
        0 8px 32px -8px rgba(0, 0, 0, 0.12);
}

.lab-figure figcaption {
    margin-top: var(--space-sm);
    font-size: 0.85rem;
    line-height: 1.55;
    color: var(--text-light);
    font-style: italic;
    padding-left: var(--space-sm);
    border-left: 2px solid var(--accent);
}

.lab-article-footer {
    margin-top: var(--space-xl);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--border);
}

.lab-article-signoff {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.7;
}

.lab-article-signoff p:first-child {
    font-size: 1rem;
    color: var(--text);
    margin-bottom: var(--space-xs);
}


/* --- Responsive --- */
@media (max-width: 640px) {
    .lab-hero {
        padding-top: calc(64px + var(--space-md));
        padding-bottom: var(--space-md);
    }

    .lab-back {
        display: none;
    }

    .lab-title {
        font-size: 2.25rem;
        margin-bottom: var(--space-sm);
    }

    .lab-intro {
        font-size: 1rem;
    }

    .lab-article-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-xs);
    }
}

/* --- Reduced motion --- */
@media (prefers-reduced-motion: reduce) {
    .lab-paper:hover {
        transform: none;
    }

    .lab-paper:hover .lab-paper-title {
        color: var(--text);
    }

    .lab-link::after {
        transform: scaleX(1);
    }

    .lab-link:hover {
        color: var(--accent);
    }
}