/* ── Mobile responsiveness (≤640px) ───────────────────────────────── */

/* Utility: show/hide by viewport */
.mobile-only { display: none; }

.mobile-collapsible-toggle {
    width: 100%;
    padding: 0;
    margin: 0;
    background: transparent;
    border: 0;
    text-align: left;
}

@media (max-width: 640px) {
    /* Global reductions */
    .page-wrapper,
    .page-wrapper--book-club {
        width: 100%;
        box-sizing: border-box;
        padding: 0.35rem;
        border-radius: 0;
    }
    .main-content { padding: 0; }
    .card { padding: 0.6rem 0.7rem; }
    .panel { padding: 0.6rem 0.7rem; }
    .section-header { margin-top: 1rem; gap: 0.5rem; flex-wrap: wrap; }
    .page-title-row { gap: 0.5rem; margin-bottom: 0.65rem; }
    .page-title-row h1 { font-size: 1.3rem; }

    /* Book grid – smaller columns */
    .book-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 0.75rem; }
    .book-card-cover-wrap, .book-card-cover-wrap img { height: 110px; }
    .book-card-cover-wrap .cover-placeholder { height: 110px; }
    .book-card .book-info { padding: 0.55rem 0.65rem; }

    /* Session summary cards */
    .sessions-row { gap: 0.75rem; margin-bottom: 0.75rem; }
    .sessions-row > .card { flex: 1 1 100%; }
    .sessions-row > .host-queue-card { flex: 1 1 100%; width: 100%; min-width: 0; }
    .host-queue-card { min-width: 0; }
    .host-queue-toggle-content {
        display: grid;
        grid-template-columns: auto minmax(0, 1fr);
        align-items: center;
        gap: 0.45rem;
        min-width: 0;
        width: 100%;
    }
    .host-queue-toggle-next {
        justify-self: center;
        min-width: 0;
        padding-left: 0;
        margin-left: 0;
    }
    .host-queue-toggle-status {
        min-height: 0;
        padding: 0;
        border: 0;
        background: transparent;
    }
    .host-queue-toggle-status > span:not(.theme-icon) {
        display: none;
    }
    .host-queue-toggle-name {
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
        max-width: 8rem;
    }
    .host-queue-list { min-width: 0; gap: 0.55rem; }
    .host-queue-item {
        grid-template-columns: minmax(0, 1fr) auto;
        gap: 0.55rem;
        min-height: 0;
        padding: 0.55rem 0.65rem 0.55rem 0.75rem;
    }
    .host-queue-person {
        gap: 0.5rem;
        width: 100%;
    }
    .host-queue-name {
        font-size: 0.94rem;
        overflow: hidden;
        text-overflow: ellipsis;
    }
    .host-queue-position {
        width: 1.45rem;
        height: 1.45rem;
        font-size: 0.72rem;
    }
    .host-queue-avatar {
        width: 1.75rem;
        height: 1.75rem;
        flex-basis: 1.75rem;
    }
    .host-queue-name { min-width: 0; }
    .host-queue-requirements {
        grid-column: auto;
        width: auto;
        display: inline-flex;
        flex-direction: row;
        align-items: center;
        gap: 0.28rem;
        justify-content: end;
    }
    .host-queue-requirement {
        min-width: 0;
        width: auto;
        min-height: 0;
        padding: 0;
        border: 0;
        background: transparent;
    }
    .host-queue-requirement span:not(.theme-icon) {
        display: none;
    }
    .host-queue-requirement .theme-icon,
    .host-queue-requirement .theme-icon svg,
    .host-queue-status-icon,
    .host-queue-status-icon svg {
        width: 0.86rem;
        height: 0.86rem;
    }
    .host-queue-avatar-initials {
        font-size: 0.75rem;
    }

    .last-session-pick-summary {
        display: grid;
        grid-template-columns: 96px minmax(0, 1fr);
        gap: 0.85rem;
        align-items: start;
    }

    .last-session-cover-wrap,
    .last-session-cover,
    .last-session-cover-placeholder {
        width: 96px;
        height: 136px;
    }

    .last-session-summary-details h3 {
        font-size: 1.15rem;
    }

    .last-session-summary-details .session-summary-author,
    .last-session-summary-details .session-summary-date {
        font-size: 0.86rem;
    }

    .last-session-rating-grid {
        grid-column: 1 / -1;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        margin-top: 0.6rem;
        padding-top: 0.65rem;
    }

    .last-session-rating-stat {
        padding: 0 0.55rem;
    }

    .last-session-rating-label {
        font-size: 0.66rem;
    }

    .last-session-rating-stat strong {
        font-size: 1.35rem;
    }

    .last-session-stars {
        font-size: 0.72rem;
        letter-spacing: 0;
    }

    .mobile-collapsible-card {
        display: flex;
        flex-direction: column;
    }

    .mobile-collapsible-toggle {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 0.75rem;
        color: var(--text);
    }

    .mobile-collapsible-toggle h2 {
        margin: 0;
        font-size: 1.1rem;
        line-height: 1.2;
    }

    .mobile-collapsible-caret {
        transition: transform 0.2s ease;
    }

    .mobile-collapsible-card--expanded .mobile-collapsible-caret {
        transform: rotate(180deg);
    }

    .mobile-collapsible-content {
        max-height: 0;
        opacity: 0;
        overflow: hidden;
        transition: max-height 0.25s ease, opacity 0.2s ease, margin-top 0.25s ease;
        margin-top: 0;
    }

    .mobile-collapsible-card--expanded .mobile-collapsible-content {
        max-height: 1200px;
        opacity: 1;
        margin-top: 0.75rem;
    }

    /* Show/hide helpers */
    .desktop-only { display: none !important; }
    .mobile-only  { display: block !important; }

    /* Discussion columns: stack vertically, banter first (already first in DOM order) */
    .discussion-columns { flex-direction: column; gap: 0.5rem; }
    .discussion-columns .discussion-section { max-width: 100%; flex: none; }

    /* Tabs */
    .tabs-wrapper { margin: 0.75rem 0 1rem; }
    .tabs {
        flex-wrap: nowrap;
        gap: 0.25rem;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    .tabs button { font-size: 0.82rem; padding: 0.35rem 0.6rem; }

    /* Reduce topnav padding */
    .topnav { display: grid; grid-template-columns: minmax(0, 1fr) auto auto; padding: 0 0.55rem 0 0.75rem; gap: 0.35rem; }
    .topnav .brand { font-size: 0.98rem; max-width: 8.4rem; }
    .nav-links { gap: 0.15rem; min-width: 0; justify-content: flex-end; }
    .nav-links a { padding: 0 0.38rem; font-size: 0.84rem; }
    .nav-profile-btn { padding: 0 0.3rem; gap: 0.35rem; }
    .nav-profile-name { display: none; }
    .nav-profile-caret { display: none; }
    .nav-dropdown { min-width: 10.5rem; right: 0; }

    .currently-reading-list { margin-top: 0.45rem; gap: 0.65rem; }
    .currently-reading-card { width: 100%; }
    .currently-reading-cover { flex-basis: 108px; width: 108px; }
    .currently-reading-card .overview-book-info { padding: 0.75rem 0.8rem; }
    .currently-reading-progress { font-size: 0.86rem; }
    .currently-reading-progress-date { font-size: 0.76rem; }
    .overview-ratings-footer { padding-top: 0.2rem; }

    .mobile-book-card { grid-template-columns: minmax(96px, 31%) minmax(0, 1fr); }
    .mobile-book-card-body { padding: 0.7rem 0.8rem; }

    .live-discussion-overlay {
        align-items: stretch;
        padding: 0.45rem;
    }

    .live-discussion-popup {
        width: 100%;
        max-height: calc(100vh - 0.9rem);
        padding: 0.65rem;
        border-radius: 10px;
    }

    .live-discussion-popup-title {
        font-size: 1rem;
    }

    .live-discussion-popup-header {
        grid-template-columns: minmax(0, 1fr) auto;
    }

    .live-discussion-popup-header .live-popup-progress-btn,
    .live-discussion-popup-header .live-popup-progress-spacer {
        grid-column: 1 / -1;
        width: 100%;
        justify-content: center;
    }

    .live-discussion-popup-header .live-popup-progress-spacer {
        display: none;
    }

    .live-layout {
        flex-direction: column;
        gap: 0.75rem;
    }

    .live-chat-column {
        width: 100%;
    }

    .statistics-collapsible-header {
        align-items: flex-start;
        gap: 0.55rem;
    }

    .statistics-collapsible-header h2,
    .statistics-collapsible-header h3 {
        min-width: 0;
        overflow-wrap: anywhere;
    }

    .stats-top5-li {
        align-items: flex-start;
    }

    .reading-speed-row {
        grid-template-columns: minmax(0, 1fr);
        gap: 0.75rem;
    }

    .reading-speed-summary-row {
        grid-template-columns: minmax(0, 1fr);
        gap: 0.75rem;
    }

    .reading-speed-plot-scroll {
        overflow-x: auto;
        overflow-y: hidden;
        -webkit-overflow-scrolling: touch;
    }

    .reading-speed-plot {
        min-width: 280px;
    }

    .page-wrapper--book-club .timeline-date-label,
    .page-wrapper--book-club .timeline-cover-dot .timeline-date-label {
        font-size: 0.52rem;
    }

    .page-wrapper--book-club .timeline-month-label {
        font-size: 0.6rem;
    }

    /* Punching Bag: stat cards side by side */
    .punching-bag-stats-row {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.65rem;
    }

}

@media (min-width: 641px) {
    .mobile-collapsible-toggle {
        display: block;
        color: inherit;
    }

    .mobile-collapsible-caret {
        display: none;
    }

    .mobile-collapsible-content {
        max-height: none;
        opacity: 1;
        overflow: visible;
        margin-top: 0;
    }
}

/* ── Mobile book card list (All Books + Book Ratings on mobile) ───── */
.mobile-book-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 0.5rem;
}

.mobile-book-card,
.mobile-stat-card {
    background: var(--surface, #fff);
    border: 1px solid var(--border);
}

.mobile-book-card {
    border-radius: 10px;
    overflow: hidden;
    display: grid;
    grid-template-columns: 25% minmax(0, 1fr);
    align-items: stretch;
}

.mobile-book-card-cover {
    width: 100%;
    height: auto;
    aspect-ratio: 2 / 3;
    overflow: hidden;
    background: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    align-self: center;
}

.mobile-book-card-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.mobile-book-card-cover--placeholder {
    color: var(--muted);
    font-size: 2.5rem;
    flex-direction: column;
    gap: 0.25rem;
    padding: 0.5rem;
    background: color-mix(in srgb, var(--action) 6%, var(--bg));
}

.mobile-book-card-body {
    padding: 0.65rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    min-width: 0;
}

.mobile-book-card-title {
    font-weight: 700;
    font-size: 1rem;
    color: var(--text);
    margin-bottom: 0.2rem;
}

.mobile-kv-list {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.mobile-kv-row {
    display: flex;
    gap: 0.4rem;
    font-size: 0.88rem;
    line-height: 1.35;
    align-items: baseline;
}

.mobile-kv-label {
    font-weight: 600;
    color: var(--muted);
    white-space: nowrap;
    min-width: 72px;
    flex-shrink: 0;
}

.mobile-kv-label::after { content: ":"; }

/* Ratings section inside a mobile book card */
.mobile-ratings-section {
    margin-top: 0.3rem;
    padding-top: 0.3rem;
    border-top: 1px solid var(--border);
}

.mobile-ratings-member {
    font-size: 0.85rem;
    margin-bottom: 0.15rem;
}

.mobile-ratings-member-name {
    font-weight: 600;
    color: var(--text);
}

.mobile-ratings-summary-row {
    display: grid;
    grid-template-columns: 72px minmax(0, 1fr) auto;
    align-items: center;
    gap: 0.45rem;
    margin-bottom: 0.35rem;
}

.mobile-ratings-summary-row:last-child {
    margin-bottom: 0;
}

.mobile-ratings-summary-label {
    font-size: 0.78rem;
    color: var(--muted);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* Yearly stats mobile cards */
.mobile-stat-card-list {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    margin-top: 0.5rem;
}

.mobile-stat-card {
    border-radius: 8px;
    border-left: 4px solid var(--action);
    padding: 0.65rem 0.75rem;
}

.mobile-stat-card-year {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--action);
    margin-bottom: 0.4rem;
}

.mobile-stat-card-cover {
    height: 48px;
    width: auto;
    border-radius: 4px;
    flex-shrink: 0;
}

.mobile-collapsible-toggle:hover,
.mobile-collapsible-toggle:focus {
    background: transparent;
}

.host-queue-card .mobile-collapsible-toggle {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 0.75rem;
}

.host-queue-card .mobile-collapsible-caret {
    display: inline-flex;
}

.host-queue-card .mobile-collapsible-content {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    transition: max-height 0.25s ease, opacity 0.2s ease, margin-top 0.25s ease;
}

.host-queue-card.mobile-collapsible-card--expanded .mobile-collapsible-content {
    max-height: 1200px;
    opacity: 1;
    margin-top: 0.75rem;
}

@media (max-width: 640px) {
    .host-queue-card .mobile-collapsible-toggle h2 {
        margin: 0;
        font-size: 1.1rem;
        line-height: 1.2;
    }
    .host-queue-collapsible-summary h2 {
        margin: 0;
        font-size: 1.1rem;
        line-height: 1.2;
    }

    /* ── Mobile overlay fixes (#3) ─────────────────────────────── */
    .themed-confirm-overlay {
        padding: 0.5rem;
        align-items: center;
    }
    .themed-confirm-card {
        width: calc(100vw - 1rem);
        max-width: 100%;
        box-sizing: border-box;
    }
    .book-detail-popup {
        width: calc(100vw - 1rem) !important;
        max-width: 100% !important;
        grid-template-columns: 1fr !important;
        padding: 1rem;
        padding-bottom: 3rem;
        gap: 0.75rem;
    }
    .book-detail-popup--personal-detail .home-personal-detail-actions {
        width: 100%;
        box-sizing: border-box;
        padding-inline: 2.75rem;
        margin-left: auto;
        margin-right: auto;
        justify-content: center;
        flex-wrap: nowrap;
    }
    .book-detail-popup--personal-detail .home-personal-detail-actions .home-personal-editor-action-btn {
        white-space: nowrap;
        min-width: 0;
        flex: 0 1 auto;
    }
    .book-detail-popup .home-personal-editor-sidebar {
        display: grid;
        grid-template-columns: auto minmax(0, 1fr);
        gap: 0.75rem;
        width: 100%;
    }
    .book-detail-popup .home-personal-editor-cover-wrap,
    .book-detail-popup .home-personal-editor-cover-placeholder {
        width: 80px;
        height: 112px;
    }
    .book-detail-popup--personal-detail .home-personal-editor-cover-wrap,
    .book-detail-popup--personal-detail .home-personal-editor-cover,
    .book-detail-popup--personal-detail .home-personal-editor-cover-placeholder {
        width: 80px;
        height: 120px;
    }
    .book-detail-popup--personal-detail .home-personal-detail-hero {
        grid-template-columns: 80px minmax(0, 1fr);
        align-items: start;
    }
    .book-detail-popup .home-personal-editor-summary-title {
        font-size: 1.05rem;
    }
    .book-detail-popup--personal-detail .home-personal-editor-summary-title {
        display: block;
    }
    .home-personal-editor-grid {
        grid-template-columns: 1fr !important;
    }
    .home-personal-rating-history-summary {
        grid-template-columns: 1fr;
        gap: 0.4rem;
    }
    .home-personal-rating-history-chart-scroll {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    .top10-title-desktop { display: none; }
    .top10-title-mobile { display: inline; }
    .top10-wrapper { gap: 0.15rem; }
    .top10-title { font-size: 0.5rem; }
    .top10-block .podium-medal { font-size: 0.9rem; }
    .top10-block .podium-place { font-size: 0.55rem; }
    .top10-block .podium-score { font-size: 0.55rem; }
}