/**
 * Páginas /estudos/ — galeria, .estudo-page, mapa (controles, notas, referências).
 * Cards herdam .site-card de main.css.
 */

.estudos-month {
    margin-bottom: 2.75rem;
}
.estudos-month:last-child {
    margin-bottom: 0;
}
.estudos-month__label {
    font-family: var(--font-serif);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text-tertiary);
    margin: 0 0 1.25rem;
    padding-bottom: 0.6rem;
    border-bottom: var(--line-width) solid var(--border-color);
}

.estudos-gallery {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

.estudos-gallery .estudo-card {
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    cursor: pointer;
    transition: border-color 0.25s ease;
}

.estudos-gallery .estudo-card::before {
    content: attr(data-index);
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    z-index: 2;
    font-family: var(--font-serif);
    font-size: 0.6875rem;
    letter-spacing: 0.14em;
    color: var(--text-tertiary);
}

.estudo-card__visual {
    position: absolute;
    top: 2.75rem;
    right: 1.5rem;
    width: clamp(5rem, 28%, 7rem);
    color: var(--text-primary);
    opacity: 0.08;
    pointer-events: none;
    transition: opacity 0.25s ease;
}

.estudo-card__visual svg {
    display: block;
    width: 100%;
    height: auto;
}

.estudos-gallery .estudo-card .site-card__tag {
    position: relative;
    z-index: 1;
    margin-bottom: 1.25rem;
    color: var(--text-tertiary);
    transition: color 0.25s ease;
}

.estudos-gallery .estudo-card .site-card__title {
    position: relative;
    z-index: 1;
    font-size: clamp(1.25rem, 1.6vw, 1.5rem);
    margin-bottom: 1.125rem;
    padding-right: 2rem;
    color: var(--text-primary);
    transition: color 0.25s ease;
}

.estudos-gallery .estudo-card .estudo-card__date {
    position: relative;
    z-index: 1;
    display: block;
    font-size: 0.75rem;
    letter-spacing: 0.04em;
    color: var(--text-tertiary);
    margin-bottom: 0.75rem;
}

.estudos-gallery .estudo-card .site-card__desc {
    position: relative;
    z-index: 1;
    flex: 1;
    margin-bottom: 0;
    color: var(--text-secondary);
    transition: color 0.25s ease;
}

.estudos-gallery .estudo-card .estudo-card__cta {
    position: relative;
    z-index: 1;
    margin-top: 1.5rem;
    padding-top: 1.25rem;
    border-top: var(--line-width) solid var(--border-color);
    color: var(--link-color);
    transition: color 0.25s ease, border-color 0.25s ease;
}

.estudos-gallery .estudo-card:hover {
    border-color: var(--text-primary);
    text-decoration: none;
}

.estudos-gallery .estudo-card:hover .site-card__title,
.estudos-gallery .estudo-card:hover .estudo-card__cta {
    color: var(--link-color);
}

.estudos-gallery .estudo-card:hover .estudo-card__visual {
    opacity: 0.16;
}

.estudos-gallery .estudo-card:hover .estudo-card__cta svg {
    transform: translateX(4px);
}

@media (max-width: 960px) {
    .estudos-gallery {
        grid-template-columns: 1fr;
    }

    .estudos-gallery .estudo-card {
        min-height: 0;
    }

    .estudo-card__visual {
        right: 2.5rem;
        width: 4.5rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    .estudos-gallery .estudo-card,
    .estudos-gallery .estudo-card::before,
    .estudos-gallery .estudo-card .estudo-card__cta svg {
        transition: none;
    }
}

/* ================================================================
   Estudo — preço de passagem (controles, legenda, notas; avião em aircraft-seat-map.css)
   ================================================================ */
.estudo-page {
    --seat-budget:   #5fa8d6;
    --seat-economy:  #7cc7b3;
    --seat-standard: #ffe2ae;
    --seat-plus:     #f5a763;
    --seat-premium:  #e87070;
    --seat-empty:    #e6e7e9;
    --seat-border:   #88857c;
}

.estudo-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background: var(--bg-secondary);
}

.estudo-aircraft-meta {
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 0.5rem;
}

.estudo-aircraft-meta__title {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    letter-spacing: 0.01em;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px dashed var(--border-color);
}

.estudo-meta-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    background: var(--bg-tertiary);
    color: var(--link-color);
}

.estudo-meta-icon svg {
    display: block;
}

.estudo-meta-icon--title {
    width: 36px;
    height: 36px;
    color: var(--link-color);
    background: var(--bg-tertiary);
}

.estudo-meta-line {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    min-width: 0;
    flex: 1;
}

.estudo-aircraft-meta__list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 0.6rem;
}

.estudo-aircraft-meta__list li {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.7rem 0.85rem;
    font-size: 0.9rem;
    line-height: 1.35;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    transition: border-color 0.15s ease, transform 0.15s ease;
}

.estudo-aircraft-meta__list li:hover {
    border-color: var(--text-tertiary);
    transform: translateY(-1px);
}

.estudo-aircraft-meta__item--wide {
    grid-column: 1 / -1;
}

.estudo-aircraft-meta__list .meta-key {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--text-tertiary);
    font-weight: 600;
}

.estudo-aircraft-meta__list .meta-val {
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
    font-size: 0.92rem;
    font-weight: 500;
}

.estudo-aircraft-meta__list .meta-val--split {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem 1.5rem;
    margin-top: 0.15rem;
}

.estudo-aircraft-meta__list .meta-stat {
    display: flex;
    flex-direction: column;
    gap: 0.05rem;
}

.estudo-aircraft-meta__list .meta-stat__num {
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.01em;
}

.estudo-aircraft-meta__list .meta-stat__lbl {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-tertiary);
}

.estudo-view-toggle {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem 1.25rem;
}

.estudo-view-toggle__label {
    font-size: 0.75rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.estudo-view-toggle__btns {
    display: inline-flex;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    overflow: hidden;
    background: var(--bg-primary);
}

.estudo-view-btn {
    font-family: inherit;
    font-size: 0.85rem;
    letter-spacing: 0.04em;
    padding: 0.45rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.estudo-view-btn:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.estudo-view-btn--active {
    background: var(--text-primary);
    color: var(--bg-primary);
}

.estudo-view-btn--active:hover {
    background: var(--text-primary);
    color: var(--bg-primary);
    opacity: 0.92;
}

.estudo-view-btn:focus-visible {
    outline: 2px solid var(--link-color);
    outline-offset: 2px;
    z-index: 1;
}

.estudo-heatmap-legend {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.65rem 1rem;
    width: 100%;
}

.estudo-heatmap-legend__bar {
    flex: 1 1 180px;
    min-width: 120px;
    height: 14px;
    border-radius: 4px;
    border: 1px solid var(--seat-border);
}

.estudo-heatmap-legend__min,
.estudo-heatmap-legend__max {
    font-size: 0.8rem;
    font-variant-numeric: tabular-nums;
    color: var(--text-primary);
    white-space: nowrap;
}

.estudo-heatmap-legend__hint {
    display: block;
    width: 100%;
    font-size: 0.78rem;
    color: var(--text-tertiary);
    letter-spacing: 0.02em;
    margin-top: 0.35rem;
}

.estudo-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1.25rem;
    align-items: center;
}

.legend-item {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
}

.legend-swatch {
    width: 14px;
    height: 14px;
    border-radius: 3px;
    background: var(--seat-standard);
    border: 1px solid var(--seat-border);
}

.legend-item.tier-budget   .legend-swatch { background: var(--seat-budget); }
.legend-item.tier-economy  .legend-swatch { background: var(--seat-economy); }
.legend-item.tier-standard .legend-swatch { background: var(--seat-standard); }
.legend-item.tier-plus     .legend-swatch { background: var(--seat-plus); }
.legend-item.tier-premium  .legend-swatch { background: var(--seat-premium); }

.estudo-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
    letter-spacing: 0.02em;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}

.estudo-stats strong {
    color: var(--text-primary);
    font-weight: 600;
}

.estudo-footnotes {
    margin-top: 3rem;
}

.estudo-footnotes h2 {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
    margin-top: 1.5rem;
}

.estudo-footnotes ul {
    list-style: none;
    padding: 0;
    margin: 1rem 0 1.5rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 0.5rem 1.5rem;
}

.estudo-footnotes li {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--text-secondary);
    border-left: 2px solid var(--border-color);
    padding-left: 0.75rem;
}

.estudo-footnotes li strong {
    color: var(--text-primary);
}

.estudo-references {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.estudo-references h2 {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.estudo-references__intro {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.estudo-references__list {
    list-style: decimal;
    padding-left: 1.5rem;
    margin: 0 0 1.5rem;
    display: grid;
    gap: 1rem;
    counter-reset: ref-counter;
}

.estudo-references__list li {
    font-size: 0.92rem;
    line-height: 1.55;
    color: var(--text-secondary);
    padding-left: 0.25rem;
}

.estudo-references__list li strong {
    color: var(--text-primary);
    font-weight: 600;
}

.estudo-references__list li em {
    color: var(--text-primary);
    font-style: italic;
}

.estudo-references__list .ref-note {
    display: block;
    margin-top: 0.35rem;
    font-size: 0.85rem;
    color: var(--text-tertiary);
    line-height: 1.5;
    padding-left: 0.6rem;
    border-left: 2px solid var(--border-color);
}

.estudo-references__disclaimer {
    font-size: 0.78rem;
    color: var(--text-tertiary);
    font-style: italic;
    margin-top: 1rem;
    padding-top: 0.75rem;
    border-top: 1px dashed var(--border-color);
    line-height: 1.5;
}

@media (max-width: 768px) {
    .estudo-stats {
        gap: 1rem;
        font-size: 0.8rem;
    }
    .estudo-footnotes ul {
        grid-template-columns: 1fr;
    }
    .estudo-aircraft-meta__list {
        grid-template-columns: 1fr;
    }
    .estudo-aircraft-meta__list .meta-val--split {
        gap: 0.5rem 1.25rem;
    }
}