/* ═══════════════════════════════════════════════════════════════
   MULTIVERSE TAB COMPONENT — 密着シネマ / Hanairo Lofi
   Accessible tablist (ARIA role=tab/tabpanel).
   Accent colour driven by CSS custom property --mv-accent.
═══════════════════════════════════════════════════════════════ */

/* Container */
.multiverse-tabs {
    --mv-accent:       #9b59b6;
    --mv-bg:           #fffcf9;
    --mv-border:       rgba(0, 0, 0, .08);
    --mv-shadow:       0 6px 32px rgba(0, 0, 0, .07);
    --mv-radius:       12px;
    --mv-transition:   .22s ease;

    margin: 2.5rem 0;
    font-family: inherit;
}

/* ── Tab navigation bar ── */
.multiverse-tabs__nav {
    display:        flex;
    gap:            0;
    padding:        0;
    margin:         0;
    list-style:     none;
    border-bottom:  2px solid var(--mv-border);
}

/* ── Individual tab button ── */
.multiverse-tab-btn {
    flex:            1;
    padding:         .8rem .5rem;
    background:      transparent;
    border:          none;
    border-bottom:   3px solid transparent;
    margin-bottom:   -2px;
    cursor:          pointer;
    font-size:       .88rem;
    font-weight:     700;
    color:           #999;
    letter-spacing:  .06em;
    white-space:     nowrap;
    transition:      color var(--mv-transition), border-color var(--mv-transition);
    outline-offset:  2px;
    border-radius:   var(--mv-radius) var(--mv-radius) 0 0;
}

.multiverse-tab-btn:hover {
    color: #555;
    background: rgba(0, 0, 0, .03);
}

.multiverse-tab-btn:focus-visible {
    outline: 2px solid var(--mv-accent);
    outline-offset: -2px;
}

.multiverse-tab-btn[aria-selected="true"] {
    color:            var(--mv-accent);
    border-bottom-color: var(--mv-accent);
    background:       var(--mv-bg);
}

/* ── Tab panel ── */
.multiverse-tab-panel {
    display:       none;
    padding:       1.75rem 2rem;
    background:    var(--mv-bg);
    border:        1px solid var(--mv-border);
    border-top:    none;
    border-radius: 0 0 var(--mv-radius) var(--mv-radius);
    box-shadow:    var(--mv-shadow);
}

.multiverse-tab-panel[aria-hidden="false"] {
    display:   block;
    animation: mv-fadein .28s ease;
}

@keyframes mv-fadein {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ── Panel inner typography ── */
.mv-tab-label {
    font-size:      .75rem;
    font-weight:    800;
    letter-spacing: .12em;
    text-transform: uppercase;
    color:          var(--mv-accent);
    margin:         0 0 .5rem;
}

.mv-tab-desc {
    font-size:   1rem;
    line-height: 1.75;
    color:       #444;
    margin:      0 0 1.25rem;
}

/* ── Gallery grid inside panels ── */
.mv-gallery {
    display:               grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap:                   .75rem;
    margin-top:            1.25rem;
}

.mv-gallery__img {
    width:         100%;
    aspect-ratio:  3 / 4;
    object-fit:    cover;
    border-radius: 8px;
    box-shadow:    0 2px 12px rgba(0, 0, 0, .10);
    transition:    transform .2s ease, box-shadow .2s ease;
}

.mv-gallery__img:hover {
    transform:  scale(1.03);
    box-shadow: 0 6px 24px rgba(0, 0, 0, .18);
}

/* ── Responsive ── */
@media (max-width: 600px) {
    .multiverse-tab-btn {
        font-size: .78rem;
        padding: .65rem .25rem;
    }
    .multiverse-tab-panel {
        padding: 1.25rem 1rem;
    }
    .mv-gallery {
        grid-template-columns: repeat(2, 1fr);
    }
}