/* ========================================================================
   Classic Insights page · insights.css
   Public reading map for field-defining technical books and papers.
   ======================================================================== */

.classic-title {
    font-family: var(--font-serif);
    font-size: 1.9rem;
    line-height: 1.25;
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

.classic-meta {
    background: var(--color-quote-bg);
    border-left: 3px solid var(--color-link);
    color: var(--color-text-muted);
    font-size: 0.94rem;
    line-height: 1.62;
    margin: 1.5rem 0 2rem;
    padding: 0.9rem 1.1rem;
}

.classic-principles {
    display: grid;
    gap: 0.85rem;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    margin: 1.4rem 0 2.5rem;
}

.classic-principle {
    background: #fff;
    border: 1px solid var(--color-rule);
    border-radius: 6px;
    padding: 0.85rem 0.95rem;
}

.classic-principle strong {
    color: var(--color-link);
    display: block;
    font-size: 0.94rem;
    margin-bottom: 0.3rem;
}

.classic-principle span {
    color: var(--color-text-muted);
    display: block;
    font-size: 0.86rem;
    line-height: 1.48;
}

.classic-controls {
    align-items: end;
    display: grid;
    gap: 0.75rem;
    grid-template-columns: minmax(15rem, 1.25fr) minmax(11rem, 0.75fr) minmax(11rem, 0.75fr);
    margin: 1.2rem 0 1rem;
}

.classic-control label {
    color: var(--color-text-muted);
    display: block;
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    margin-bottom: 0.25rem;
    text-transform: uppercase;
}

.classic-control input,
.classic-control select {
    background: #fff;
    border: 1px solid var(--color-rule);
    border-radius: 4px;
    color: var(--color-text);
    font: inherit;
    min-height: 2.25rem;
    padding: 0.42rem 0.55rem;
    width: 100%;
}

.classic-count {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin: 0.35rem 0 0.75rem;
}

.classic-table-wrap {
    overflow-x: auto;
}

.classic-table {
    border-collapse: collapse;
    font-size: 0.9rem;
    line-height: 1.45;
    min-width: 1080px;
    width: 100%;
}

.classic-table th,
.classic-table td {
    border-top: 1px solid var(--color-rule);
    padding: 0.68rem 0.62rem;
    text-align: left;
    vertical-align: top;
}

.classic-table th {
    background: var(--color-quote-bg);
    color: var(--color-text);
    font-weight: 700;
    white-space: nowrap;
}

.classic-table td:first-child {
    width: 12rem;
}

.classic-work-title {
    color: var(--color-text);
    font-weight: 700;
    text-decoration: none;
}

.classic-work-title:hover {
    color: var(--color-link);
    text-decoration: underline;
}

.classic-author,
.classic-small {
    color: var(--color-text-muted);
    display: block;
    font-size: 0.78rem;
    line-height: 1.4;
    margin-top: 0.18rem;
}

.classic-badges {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    margin-top: 0.35rem;
}

.classic-badge {
    background: var(--color-badge-bg);
    border-radius: 3px;
    color: var(--color-badge);
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    line-height: 1;
    padding: 0.22rem 0.38rem;
}

.classic-badge.secondary {
    background: #f0f6f4;
    color: #49695f;
}

.classic-empty {
    background: #fff;
    border: 1px solid var(--color-rule);
    border-radius: 6px;
    color: var(--color-text-muted);
    margin-top: 1rem;
    padding: 1rem;
}

.classic-closing {
    border-top: 1px solid var(--color-rule);
    margin-top: 2.4rem;
    padding-top: 1.3rem;
}

.classic-closing h2 {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    margin-bottom: 0.65rem;
}

.classic-closing p {
    color: var(--color-text-muted);
    line-height: 1.62;
    max-width: var(--measure);
}

@media (max-width: 760px) {
    .classic-title { font-size: 1.55rem; }
    .classic-principles,
    .classic-controls { grid-template-columns: 1fr; }
}

@media (min-width: 761px) and (max-width: 980px) {
    .classic-principles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}