/* web/static/css/study.css
 * Study surface. Theme-variable colours only.
 */

.study-screen {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px 28px 64px;
}

.study-screen__header {
    margin-bottom: 2rem;
}

.study-screen__title {
    font-family: var(--font-serif);
    font-size: 2.2em;
    font-weight: 500;
    margin: 0 0 0.4rem;
    color: var(--text-primary);
    letter-spacing: -0.01em;
}

.study-screen__subtitle {
    font-family: var(--font-sans);
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.55;
    margin: 0;
    max-width: 62ch;
}

.study-section {
    margin-bottom: 2.5rem;
}

.study-section__head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.study-section__title {
    font-family: var(--font-serif);
    font-weight: 500;
    font-size: 1.3em;
    margin: 0;
    color: var(--text-primary);
}

.study-section__aside {
    font-family: var(--font-mono);
    font-size: 0.8em;
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition);
}

.study-section__aside:hover {
    color: var(--text-primary);
}

.study-section__status {
    font-family: var(--font-sans);
    color: var(--text-muted);
    font-size: 0.9rem;
    margin: 0.5rem 0;
}

.study-section__status-detail {
    color: var(--text-muted);
    font-style: italic;
}

/* --- Books grid --- */

.study-books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 0.9rem;
}

.study-book-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 1rem 1.1rem;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    text-decoration: none;
    min-height: 140px;
    transition: border-color var(--transition), background var(--transition), transform var(--transition);
}

.study-book-card:hover,
.study-book-card:focus {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 5%, var(--bg-surface));
    transform: translateY(-1px);
    outline: none;
}

.study-book-card__inner {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.study-book-card__title {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--text-primary);
    line-height: 1.3;
}

.study-book-card__author {
    font-family: var(--font-sans);
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.study-book-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    margin-top: 0.25rem;
}

.study-book-card__tag {
    font-family: var(--font-sans);
    font-size: 0.7rem;
    padding: 0.1rem 0.45rem;
    border-radius: 999px;
    background: color-mix(in srgb, var(--accent) 10%, var(--bg));
    color: var(--text-muted);
}

.study-book-card__cta {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent);
    margin-top: 0.8rem;
}

/* --- Sandbox card --- */

.study-sandbox-card {
    display: block;
    padding: 1.3rem 1.4rem;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    text-decoration: none;
    transition: border-color var(--transition), background var(--transition), transform var(--transition);
}

.study-sandbox-card:hover,
.study-sandbox-card:focus {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 5%, var(--bg-surface));
    transform: translateY(-1px);
    outline: none;
}

.study-sandbox-card__eyebrow {
    font-family: var(--font-sans);
    font-size: 10.5px;
    letter-spacing: 0.18em;
    color: var(--text-muted);
    margin-bottom: 0.35rem;
}

.study-sandbox-card__title {
    font-family: var(--font-serif);
    font-size: 1.2rem;
    font-weight: 500;
    margin: 0 0 0.5rem;
    color: var(--text-primary);
}

.study-sandbox-card__body {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    line-height: 1.55;
    color: var(--text-secondary);
    margin: 0 0 0.6rem;
    max-width: 62ch;
}

.study-sandbox-card__cta {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--accent);
}