/* books.css — Public catalogue page, matching infinitylearningspace.com theme */

@import url('https://fonts.googleapis.com/css2?family=Sora:wght@400;500;600;700;800&family=DM+Sans:ital,opsz,wght@0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&display=swap');

/* ── Variables ───────────────────────────────────────────── */
:root {
    --color-bg:         #FAFAF7;
    --color-white:      #FFFFFF;
    --color-text:       #1C1C1E;
    --color-muted:      #6b6b6e;
    --color-border:     rgba(28,28,30,0.10);
    --color-purple:     #7B2D8B;
    --color-purple-l:   rgba(123,45,139,0.10);
    --color-purple-m:   rgba(123,45,139,0.20);
    --color-teal:       #00A878;
    --color-teal-l:     rgba(0,168,120,0.12);

    --font-display:     'Sora', sans-serif;
    --font-body:        'DM Sans', sans-serif;

    --radius-sm:        6px;
    --radius-md:        12px;
    --radius-lg:        20px;
    --radius-pill:      999px;

    --shadow-card:      0 1px 2px rgba(28,28,30,.04), 0 4px 12px rgba(28,28,30,.08), 0 12px 32px rgba(28,28,30,.06);
    --shadow-card-hover:0 2px 4px rgba(28,28,30,.06), 0 8px 24px rgba(28,28,30,.12), 0 20px 48px rgba(28,28,30,.10);
    --shadow-btn:       0 1px 3px rgba(28,28,30,.20), 0 4px 12px rgba(28,28,30,.15);

    --ease-spring:      cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-out:         cubic-bezier(0.22, 1, 0.36, 1);

    --nav-h:            68px;
    --max-w:            1440px;
    --px:               20px;
}
@media (min-width: 640px) { :root { --px: 32px; } }

/* ── Reset / Base ────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    -webkit-font-smoothing: antialiased;
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-h);
}

body::before {
    content: '';
    position: fixed; inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    opacity: 0.018; z-index: 9998; pointer-events: none;
}

img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
button { cursor: pointer; font-family: var(--font-body); border: none; background: none; }

:focus-visible { outline: 3px solid rgba(28,28,30,0.25); outline-offset: 2px; }

/* ── Layout helpers ──────────────────────────────────────── */
.bk-container {
    max-width: var(--max-w);
    margin: 0 auto;
    padding-left: var(--px);
    padding-right: var(--px);
}

/* ── Navbar ──────────────────────────────────────────────── */
#bk-nav {
    position: sticky; top: 0; z-index: 1000;
    height: var(--nav-h);
    background: rgba(250,250,247,0.92);
    border-bottom: 1px solid transparent;
    transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    backdrop-filter: blur(0px);
    -webkit-backdrop-filter: blur(0px);
}
#bk-nav.scrolled {
    background: rgba(255,255,255,0.95);
    border-bottom-color: rgba(28,28,30,0.08);
    box-shadow: 0 1px 12px rgba(28,28,30,0.06);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}
#bk-nav .bk-container {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.bk-nav-logo img { height: 36px; }
.bk-nav-links {
    display: none;
    gap: 32px;
    align-items: center;
}
@media (min-width: 768px) { .bk-nav-links { display: flex; } }
.bk-nav-link {
    font-size: 14px; font-weight: 500;
    color: var(--color-muted);
    position: relative;
    transition: color 0.2s ease;
}
.bk-nav-link::after {
    content: ''; position: absolute; bottom: -3px; left: 0; right: 0;
    height: 2px; background: var(--color-purple);
    transform: scaleX(0); transform-origin: left;
    transition: transform 0.2s var(--ease-out);
}
.bk-nav-link:hover { color: var(--color-text); }
.bk-nav-link:hover::after { transform: scaleX(1); }
.bk-nav-link.active { color: var(--color-purple); font-weight: 600; cursor: default; }
.bk-nav-link.active::after { transform: scaleX(1); }

/* Breadcrumb bar */
#bk-breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px var(--px);
    max-width: var(--max-w);
    margin: 0 auto;
    font-size: 13px;
    color: var(--color-muted);
}
.bk-breadcrumb-back {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--color-purple);
    font-weight: 500;
    transition: opacity 0.15s;
}
.bk-breadcrumb-back:hover { opacity: 0.7; }
.bk-breadcrumb-sep { color: var(--color-border); }
.bk-breadcrumb-current { color: var(--color-muted); }

.bk-nav-actions { display: flex; align-items: center; gap: 12px; }

.btn-primary {
    background: var(--color-text);
    color: #fff;
    padding: 10px 22px;
    border-radius: var(--radius-sm);
    font-size: 14px; font-weight: 600;
    box-shadow: var(--shadow-btn);
    transition: opacity 0.2s, transform 0.2s var(--ease-spring), box-shadow 0.2s;
    display: inline-flex; align-items: center; gap: 6px;
}
.btn-primary:hover { opacity: 0.88; transform: translateY(-1px); }

/* Mobile menu toggle */
.bk-menu-toggle {
    display: flex; align-items: center; justify-content: center;
    width: 40px; height: 40px;
    border-radius: var(--radius-sm);
    color: var(--color-text);
    transition: background 0.2s;
}
.bk-menu-toggle:hover { background: rgba(28,28,30,0.06); }
@media (min-width: 768px) { .bk-menu-toggle { display: none; } }

/* Mobile menu */
#bk-mobile-menu {
    position: fixed; top: var(--nav-h); left: 0; right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    padding: 12px var(--px) 20px;
    box-shadow: 0 8px 24px rgba(28,28,30,0.10);
    transform: translateY(-8px); opacity: 0; pointer-events: none;
    transition: transform 0.25s var(--ease-out), opacity 0.25s ease;
    z-index: 999;
}
#bk-mobile-menu.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
.bk-mobile-link {
    display: block; padding: 12px 0;
    font-size: 16px; font-weight: 500;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text);
}
.bk-mobile-link:last-child { border-bottom: none; }

/* ── Toolbar ─────────────────────────────────────────────── */
#bk-toolbar {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky; top: var(--nav-h); z-index: 99;
}
.bk-tb-inner {
    max-width: var(--max-w); margin: 0 auto;
    padding: 14px var(--px) 12px;
    display: flex; flex-direction: column; gap: 10px;
}
.bk-tb-row1 {
    display: flex; justify-content: space-between; align-items: flex-end; gap: 12px;
}
.bk-tb-title { flex: 1; min-width: 0; }
.bk-page-title {
    font-family: var(--font-display);
    font-size: clamp(20px, 2.5vw, 26px);
    font-weight: 700; letter-spacing: -0.02em;
    color: var(--color-text); line-height: 1.2;
}
.bk-title-count {
    font-size: 13px; font-weight: 400;
    color: var(--color-muted); font-family: var(--font-body);
    letter-spacing: 0; margin-left: 10px;
}

/* View mode buttons */
.bk-view-modes { display: flex; gap: 4px; flex-shrink: 0; }
.bk-view-btn {
    padding: 5px 13px; font-size: 12px; font-weight: 500;
    border: 1.5px solid var(--color-border); border-radius: var(--radius-pill);
    background: var(--color-white); color: var(--color-muted);
    transition: all 0.15s; white-space: nowrap;
}
.bk-view-btn:hover:not(.active) { border-color: var(--color-purple); color: var(--color-purple); }
.bk-view-btn.active { background: var(--color-purple); color: #fff; border-color: var(--color-purple); }

/* Row 2: filter chips + sort + tags */
.bk-tb-row2 {
    display: flex; align-items: center; justify-content: space-between;
    gap: 10px; flex-wrap: wrap;
}
.bk-filter-chips { display: flex; gap: 6px; flex-wrap: wrap; }
.bk-fchip {
    padding: 5px 14px; border-radius: var(--radius-pill);
    border: 1.5px solid var(--color-border);
    background: var(--color-white); color: var(--color-muted);
    font-family: var(--font-body); font-size: 13px; font-weight: 500;
    cursor: pointer; transition: all 0.15s;
}
.bk-fchip:hover:not(.active) { border-color: var(--color-purple); color: var(--color-purple); }
.bk-fchip.active { background: var(--color-purple); color: #fff; border-color: var(--color-purple); }

.bk-tb-ctrl { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; flex-shrink: 0; }
.bk-sort-bar { display: flex; align-items: center; gap: 4px; }
.bk-sort-lbl {
    font-size: 11px; font-weight: 600; color: var(--color-muted);
    text-transform: uppercase; letter-spacing: 0.05em;
    margin-right: 4px; white-space: nowrap;
}
.bk-sort-btn {
    padding: 4px 12px; font-size: 12px; font-weight: 500;
    border: 1.5px solid var(--color-border); border-radius: var(--radius-pill);
    background: var(--color-white); color: var(--color-muted);
    transition: all 0.15s; white-space: nowrap;
}
.bk-sort-btn:hover:not(.active) { border-color: var(--color-purple); color: var(--color-purple); }
.bk-sort-btn.active { background: var(--color-purple); color: #fff; border-color: var(--color-purple); }

.bk-tag-toggle {
    padding: 4px 12px; font-size: 12px; font-weight: 500;
    border: 1.5px solid var(--color-border); border-radius: var(--radius-pill);
    background: var(--color-white); color: var(--color-muted);
    display: inline-flex; align-items: center; gap: 5px;
    transition: all 0.15s; white-space: nowrap;
}
.bk-tag-toggle:hover:not(.open) { border-color: var(--color-purple); color: var(--color-purple); }
.bk-tag-toggle.open { background: var(--color-purple); color: #fff; border-color: var(--color-purple); }
.bk-tag-count {
    font-size: 10px; font-weight: 700; background: rgba(255,255,255,0.3);
    min-width: 16px; height: 16px; border-radius: var(--radius-pill);
    display: inline-flex; align-items: center; justify-content: center; padding: 0 4px;
}
.bk-tag-toggle:not(.open) .bk-tag-count { background: var(--color-purple); color: #fff; }

/* Search bar */
.bk-search-wrap { position: relative; width: 100%; }
.bk-search-wrap svg {
    position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
    color: var(--color-muted); pointer-events: none;
}
#bk-search {
    width: 100%; padding: 10px 44px 10px 42px;
    border-radius: var(--radius-pill);
    border: 1.5px solid var(--color-border);
    background: var(--color-white);
    font-family: var(--font-body); font-size: 14px; color: var(--color-text);
    transition: border-color 0.2s, box-shadow 0.2s; outline: none;
}
#bk-search:focus {
    border-color: var(--color-purple);
    box-shadow: 0 0 0 3px rgba(123,45,139,0.12);
}
.bk-search-clear {
    position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
    width: 26px; height: 26px; border-radius: 50%;
    display: none; align-items: center; justify-content: center;
    background: rgba(28,28,30,0.08); color: var(--color-muted);
    font-size: 17px; line-height: 1; transition: background 0.15s;
}
.bk-search-clear:hover { background: rgba(28,28,30,0.15); }
.bk-search-clear.visible { display: flex; }

/* Tag panel */
.bk-tag-panel {
    background: rgba(28,28,30,0.03); border: 1px solid var(--color-border);
    border-radius: var(--radius-md); padding: 12px 16px;
    display: flex; flex-direction: column; gap: 8px;
}
.bk-tag-group-row {
    display: flex; align-items: flex-start; gap: 10px; flex-wrap: wrap;
}
.bk-tag-group-lbl {
    font-size: 11px; font-weight: 700; color: var(--color-muted);
    text-transform: uppercase; letter-spacing: 0.05em;
    min-width: 58px; padding-top: 4px; flex-shrink: 0;
}
.bk-tag-chips { display: flex; gap: 5px; flex-wrap: wrap; }
.bk-tag-chip {
    padding: 3px 10px; font-size: 12px; font-weight: 500;
    border: 1.5px solid var(--color-border); border-radius: var(--radius-pill);
    background: var(--color-white); color: var(--color-muted);
    cursor: pointer; font-family: var(--font-body); transition: all 0.15s;
}
.bk-tag-chip:hover:not(.active) { border-color: var(--color-purple); color: var(--color-purple); }
.bk-tag-chip.active { background: var(--color-purple); color: #fff; border-color: var(--color-purple); }
.bk-tag-clear {
    font-size: 12px; color: var(--color-muted); background: none; border: none;
    cursor: pointer; padding: 2px 0; text-decoration: underline;
    font-family: var(--font-body); transition: color 0.15s;
}
.bk-tag-clear:hover { color: var(--color-text); }

/* Mobile: stack view buttons below title */
@media (max-width: 480px) {
    .bk-tb-row1 { flex-wrap: wrap; align-items: flex-start; }
    .bk-view-modes { order: 3; width: 100%; }
    .bk-tb-row2 { flex-direction: column; align-items: flex-start; }
    .bk-tb-ctrl { flex-wrap: wrap; }
}

/* ── Main content ────────────────────────────────────────── */
#bk-main {
    padding: 32px var(--px) 64px;
    max-width: var(--max-w); margin: 0 auto;
}
.bk-results-bar {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 20px;
}
#bk-results-count {
    font-size: 13px; color: var(--color-muted); font-weight: 500;
}
.bk-sort-select {
    font-family: var(--font-body); font-size: 13px; font-weight: 500;
    border: 1.5px solid var(--color-border); border-radius: var(--radius-sm);
    padding: 6px 10px; background: var(--color-white); color: var(--color-text);
    cursor: pointer;
}

/* ── Book grid ───────────────────────────────────────────── */
#bk-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 20px;
}
@media (min-width: 640px)  { #bk-grid { grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); } }
@media (min-width: 1024px) { #bk-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 24px; } }

/* Book card */
.bk-card {
    background: var(--color-white);
    border-radius: var(--radius-md);
    border: 1px solid rgba(28,28,30,0.06);
    box-shadow: var(--shadow-card);
    overflow: hidden; cursor: pointer;
    transition: transform 0.25s var(--ease-spring), box-shadow 0.25s ease;
}
.bk-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card-hover);
}
.bk-card-cover {
    aspect-ratio: 3 / 4;
    background: var(--color-purple-l);
    overflow: hidden; position: relative;
}
.bk-card-cover img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform 0.4s var(--ease-out);
}
.bk-card:hover .bk-card-cover img { transform: scale(1.04); }

/* Initials fallback */
.bk-cover-fallback {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--color-purple-m), var(--color-purple-l));
}
.bk-cover-initials {
    font-family: var(--font-display);
    font-size: 28px; font-weight: 700;
    color: var(--color-purple);
    text-align: center; padding: 12px;
    line-height: 1.2;
}
.bk-card-body { padding: 12px; }
.bk-card-title {
    font-family: var(--font-display);
    font-size: 13px; font-weight: 600; line-height: 1.35;
    color: var(--color-text);
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
    margin-bottom: 4px;
}
.bk-card-author {
    font-size: 12px; color: var(--color-muted); font-weight: 400;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    margin-bottom: 10px;
}
.bk-card-meta {
    display: flex; align-items: center; justify-content: space-between; gap: 6px;
}
.bk-age-badge {
    display: inline-flex; align-items: center;
    padding: 3px 8px; border-radius: var(--radius-pill);
    background: var(--color-purple-l);
    color: var(--color-purple); font-size: 11px; font-weight: 600;
    white-space: nowrap;
}
.bk-avail-dot {
    width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
}
.bk-avail-dot.available   { background: var(--color-teal); }
.bk-avail-dot.unavailable { background: rgba(28,28,30,0.25); }

/* ── List view ───────────────────────────────────────────── */
.bk-list-wrap { overflow-x: auto; }
.bk-list-tbl {
    width: 100%; border-collapse: separate; border-spacing: 0; font-size: 13px;
}
.bk-list-tbl th {
    text-align: left; font-size: 11px; font-weight: 700;
    color: var(--color-muted); text-transform: uppercase; letter-spacing: 0.06em;
    border-bottom: 2px solid var(--color-border);
    padding: 10px 12px; white-space: nowrap; background: var(--color-bg);
}
.bk-list-tbl td {
    padding: 10px 12px; border-bottom: 1px solid var(--color-border);
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap; vertical-align: middle;
}
.bk-list-tbl tbody tr { cursor: pointer; transition: background 0.1s; }
.bk-list-tbl tbody tr:hover td { background: var(--color-purple-l); }
.bk-list-td-title { font-weight: 500; color: var(--color-text); max-width: 0; }
.bk-list-td-author { color: var(--color-muted); font-size: 12px; max-width: 0; }
.bk-list-td-type { color: var(--color-muted); font-size: 12px; }
@media (max-width: 639px) {
    .bk-list-tbl col:nth-child(3) { display: none; }
    .bk-list-tbl td:nth-child(3),
    .bk-list-tbl th:nth-child(3) { display: none; }
}

/* ── Load more ───────────────────────────────────────────── */
#bk-load-more-wrap {
    text-align: center; margin-top: 40px;
}
.bk-load-more-btn {
    padding: 12px 36px;
    border-radius: var(--radius-pill);
    border: 2px solid var(--color-text);
    background: transparent; color: var(--color-text);
    font-family: var(--font-body); font-size: 14px; font-weight: 600;
    transition: background 0.2s, color 0.2s, transform 0.2s var(--ease-spring);
}
.bk-load-more-btn:hover {
    background: var(--color-text); color: #fff;
    transform: translateY(-2px);
}

/* ── Empty / loading states ──────────────────────────────── */
.bk-empty {
    grid-column: 1 / -1;
    text-align: center; padding: 60px 20px;
    color: var(--color-muted);
}
.bk-empty-icon { font-size: 48px; margin-bottom: 12px; opacity: 0.35; }
.bk-empty-text { font-family: var(--font-display); font-size: 18px; font-weight: 600; margin-bottom: 8px; }
.bk-empty-sub  { font-size: 14px; }

.bk-skeleton {
    background: linear-gradient(90deg, #ebebeb 25%, #f5f5f5 50%, #ebebeb 75%);
    background-size: 200% 100%;
    animation: bk-shimmer 1.4s infinite;
    border-radius: var(--radius-md);
}
@keyframes bk-shimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}
.bk-card-skeleton .bk-card-cover { aspect-ratio: 3/4; }
.bk-card-skeleton .bk-card-body  { padding: 12px; }
.bk-card-skeleton .sk-line {
    height: 12px; border-radius: 6px; margin-bottom: 8px;
}
.bk-card-skeleton .sk-line.sk-title  { width: 85%; }
.bk-card-skeleton .sk-line.sk-author { width: 60%; }
.bk-card-skeleton .sk-line.sk-meta   { width: 40%; margin-bottom: 0; }

/* ── Detail panel ────────────────────────────────────────── */
#bk-backdrop {
    position: fixed; inset: 0;
    background: rgba(10,10,12,0.55);
    backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
    opacity: 0; pointer-events: none;
    transition: opacity 0.25s ease;
    z-index: 1050;
}
#bk-backdrop.open { opacity: 1; pointer-events: auto; }

#bk-panel {
    position: fixed; top: 0; right: 0; bottom: 0;
    width: 100%; max-width: 480px;
    background: var(--color-white);
    box-shadow: -8px 0 40px rgba(28,28,30,0.16);
    transform: translateX(100%);
    transition: transform 0.4s var(--ease-spring);
    z-index: 1060;
    display: flex; flex-direction: column; overflow: hidden;
}
#bk-panel.open { transform: translateX(0); }
@media (max-width: 500px) { #bk-panel { max-width: 100%; } }

.bk-panel-accent {
    height: 5px; background: var(--color-purple); flex-shrink: 0;
}
.bk-panel-hdr {
    display: flex; justify-content: flex-end; align-items: center;
    padding: 10px 16px; border-bottom: 1px solid var(--color-border);
    flex-shrink: 0;
}
.bk-panel-close {
    width: 36px; height: 36px; border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    color: var(--color-muted); font-size: 22px; line-height: 1;
    transition: background 0.15s, color 0.15s;
}
.bk-panel-close:hover { background: rgba(28,28,30,0.06); color: var(--color-text); }

.bk-panel-body { flex: 1; overflow-y: auto; padding: 0 24px 32px; }

.bk-panel-book-hdr {
    display: flex; gap: 20px; padding: 24px 0 20px;
    border-bottom: 1px solid var(--color-border); margin-bottom: 20px;
}
.bk-panel-cover {
    width: 110px; min-width: 110px; height: 147px;
    border-radius: var(--radius-sm); overflow: hidden;
    background: var(--color-purple-l); flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(28,28,30,0.12);
}
.bk-panel-cover img { width: 100%; height: 100%; object-fit: cover; }
.bk-panel-cover-fallback {
    width: 100%; height: 100%;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--color-purple-m), var(--color-purple-l));
    font-family: var(--font-display); font-size: 24px; font-weight: 700;
    color: var(--color-purple); text-align: center; padding: 8px;
}
.bk-panel-meta { flex: 1; display: flex; flex-direction: column; gap: 8px; padding-top: 4px; }
.bk-panel-title {
    font-family: var(--font-display); font-size: 18px; font-weight: 700;
    line-height: 1.25; letter-spacing: -0.01em; color: var(--color-text);
}
.bk-panel-author { font-size: 14px; color: var(--color-muted); font-weight: 400; }
.bk-panel-badges { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.bk-badge {
    padding: 4px 10px; border-radius: var(--radius-pill);
    font-size: 12px; font-weight: 600;
}
.bk-badge-age  { background: var(--color-purple-l); color: var(--color-purple); }
.bk-badge-type { background: rgba(28,28,30,0.06); color: var(--color-muted); }
.bk-badge-avail-yes { background: var(--color-teal-l); color: var(--color-teal); }
.bk-badge-avail-no  { background: rgba(28,28,30,0.06); color: var(--color-muted); }

.bk-panel-sec-lbl {
    font-size: 11px; font-weight: 700; letter-spacing: 0.08em;
    text-transform: uppercase; color: var(--color-muted);
    margin-bottom: 8px;
}
.bk-panel-desc {
    font-size: 14px; line-height: 1.7; color: #3a3a3e;
    margin-bottom: 20px;
}
.bk-panel-series {
    display: flex; align-items: center; gap: 10px;
    background: var(--color-purple-l); border-radius: var(--radius-md);
    padding: 12px 16px; margin-bottom: 24px;
}
.bk-panel-series-icon { font-size: 20px; }
.bk-panel-series-text { font-size: 13px; color: var(--color-purple); font-weight: 600; }

.bk-panel-cta {
    display: flex; align-items: center; justify-content: center; gap: 8px;
    width: 100%;
    background: var(--color-purple);
    color: #fff; font-size: 15px; font-weight: 600;
    padding: 14px 24px; border-radius: var(--radius-md);
    transition: opacity 0.2s, transform 0.2s var(--ease-spring);
    box-shadow: 0 2px 8px rgba(123,45,139,0.25);
}
.bk-panel-cta:hover { opacity: 0.9; transform: translateY(-1px); }

.bk-panel-loading {
    padding: 48px 0; text-align: center;
    color: var(--color-muted); font-size: 14px;
}

/* ── Footer ──────────────────────────────────────────────── */
#bk-footer {
    background: var(--color-text);
    padding: 48px var(--px) 32px;
}
.bk-footer-grid {
    max-width: var(--max-w); margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
    margin-bottom: 36px;
}
@media (min-width: 640px)  { .bk-footer-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1024px) { .bk-footer-grid { grid-template-columns: 2fr 1fr 1fr; } }

.bk-footer-logo img {
    height: 32px; margin-bottom: 16px;
    filter: brightness(0) invert(1);
}
.bk-footer-tagline {
    font-size: 13px; line-height: 1.6; color: rgba(255,255,255,0.55);
    max-width: 300px; margin-bottom: 20px;
}
.bk-footer-socials { display: flex; gap: 10px; }
.bk-social-link {
    width: 36px; height: 36px; border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.2);
    display: flex; align-items: center; justify-content: center;
    color: rgba(255,255,255,0.65);
    transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.bk-social-link:hover { background: rgba(255,255,255,0.1); border-color: rgba(255,255,255,0.4); color: #fff; }
.bk-social-link svg { width: 16px; height: 16px; }

.bk-footer-col-lbl {
    font-size: 11px; font-weight: 700; letter-spacing: 0.1em;
    text-transform: uppercase; color: rgba(255,255,255,0.35);
    margin-bottom: 16px;
}
.bk-footer-links { display: flex; flex-direction: column; gap: 10px; }
.bk-footer-link {
    font-size: 14px; color: rgba(255,255,255,0.6);
    transition: color 0.2s;
    display: flex; align-items: center; gap: 8px;
}
.bk-footer-link:hover { color: #fff; }
.bk-footer-link svg { width: 15px; height: 15px; opacity: 0.7; flex-shrink: 0; }

.bk-footer-bottom {
    max-width: var(--max-w); margin: 0 auto;
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
    display: flex; justify-content: space-between; align-items: center;
    flex-wrap: wrap; gap: 8px;
}
.bk-footer-copy { font-size: 12px; color: rgba(255,255,255,0.35); }
.bk-footer-credit { font-size: 12px; color: rgba(255,255,255,0.25); }
.bk-footer-credit a { color: rgba(255,255,255,0.45); transition: color 0.2s; }
.bk-footer-credit a:hover { color: rgba(255,255,255,0.8); }

/* ── Responsive tweaks ───────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}