/**
 * CATALOGUE FRAMED LAYOUT - 3-Panel Navigator
 * Replaces legacy frameset with CSS Grid + iframe approach
 * Desktop: years sidebar | iframe content | countries sidebar
 * Mobile: single column with slide-out overlay sidebars
 */

/* ===== 3-PANEL GRID LAYOUT ===== */
.catalogue-frame-layout {
    display: grid;
    grid-template-columns: 170px 1fr 220px;
    height: calc(100vh - 60px);
    border-top: 3px solid var(--hp-yellow);
    overflow: hidden;
}

/* ===== SHARED SIDEBAR STYLES ===== */
.catalogue-sidebar--years,
.catalogue-sidebar--countries {
    position: relative;
    top: 0;
    height: 100%;
    overflow-y: auto;
    background: var(--hp-white);
    border-color: var(--hp-gray);
    padding: 0;
    scrollbar-width: thin;
    scrollbar-color: var(--hp-gray-medium) transparent;
}

.catalogue-sidebar--years::-webkit-scrollbar,
.catalogue-sidebar--countries::-webkit-scrollbar {
    width: 5px;
}

.catalogue-sidebar--years::-webkit-scrollbar-thumb,
.catalogue-sidebar--countries::-webkit-scrollbar-thumb {
    background: var(--hp-gray-medium);
    border-radius: 3px;
}

.catalogue-sidebar--years {
    border-right: 1px solid var(--hp-gray);
}

.catalogue-sidebar--countries {
    border-left: 1px solid var(--hp-gray);
}

/* ===== SIDEBAR HEADERS ===== */
.sidebar-header {
    position: sticky;
    top: 0;
    z-index: 2;
    background: var(--hp-black);
    color: var(--hp-white);
    padding: 0.75rem 1rem;
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-align: center;
    border-bottom: 2px solid var(--hp-yellow);
}

.sidebar-header a {
    color: var(--hp-white);
    text-decoration: none;
}

.sidebar-header a:hover {
    color: var(--hp-yellow-light);
}

/* ===== YEARS SIDEBAR ===== */
.year-list {
    list-style: none;
    margin: 0;
    padding: 0.5rem 0;
}

.year-list__item {
    margin: 0;
}

.year-list__link {
    display: block;
    padding: 0.35rem 0.75rem 0.35rem 1rem;
    font-family: var(--font-body);
    font-size: 0.875rem;
    color: var(--hp-text);
    text-decoration: none;
    border-left: 3px solid transparent;
    transition: all 0.15s ease;
    line-height: 1.4;
}

.year-list__link:hover {
    background: var(--hp-warm-white);
    border-left-color: var(--hp-yellow);
    color: var(--hp-black);
}

.year-list__link--active {
    background: var(--hp-yellow-glow);
    border-left-color: var(--hp-yellow);
    color: var(--hp-black);
    font-weight: 600;
}

.year-list__divider {
    height: 1px;
    background: var(--hp-gray);
    margin: 0.4rem 1rem;
}

/* ===== CONTENT IFRAME AREA ===== */
.catalogue-content-frame {
    min-height: 0;
    height: 100%;
    overflow: hidden;
    background: var(--hp-cream);
}

.catalogue-content-frame iframe {
    width: 100%;
    height: 100%;
    border: none;
    display: block;
}

/* ===== COUNTRIES SIDEBAR ===== */

/* A-Z Letter Grid */
.az-letter-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 3px;
    padding: 0.625rem;
}

.az-letter-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.4rem 0;
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--hp-text);
    background: var(--hp-warm-white);
    border: 1px solid var(--hp-gray);
    border-radius: 3px;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.15s ease;
    line-height: 1;
}

.az-letter-btn:hover {
    background: var(--hp-yellow-glow);
    border-color: var(--hp-yellow);
    color: var(--hp-black);
}

.az-letter-btn--active {
    background: var(--hp-yellow);
    border-color: var(--hp-yellow-dark);
    color: var(--hp-black);
}

/* Country List */
#country-list {
    padding: 0;
}

.country-list-section {
    border-top: 1px solid var(--hp-gray);
}

.country-list-section__header {
    padding: 0.5rem 0.75rem;
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--hp-gray-dark);
    background: var(--hp-gray-light);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.country-link {
    display: block;
    padding: 0.35rem 0.75rem;
    font-family: var(--font-body);
    font-size: 0.8125rem;
    color: var(--hp-text);
    text-decoration: none;
    transition: all 0.15s ease;
    line-height: 1.4;
    border-bottom: 1px solid rgba(0,0,0,0.04);
}

.country-link:hover {
    background: var(--hp-warm-white);
    color: var(--hp-black);
    padding-left: 1rem;
}

.country-link--active {
    background: var(--hp-yellow-glow);
    font-weight: 500;
}

.country-loading {
    padding: 1.5rem 1rem;
    text-align: center;
    color: var(--hp-gray-medium);
    font-size: 0.8125rem;
    font-style: italic;
}

.country-empty {
    padding: 1.5rem 1rem;
    text-align: center;
    color: var(--hp-gray-medium);
    font-size: 0.8125rem;
}

/* ===== MOBILE TOGGLE BAR ===== */
.catalogue-toggle-bar {
    display: none;
    background: var(--hp-black);
    padding: 0;
    gap: 0;
    position: sticky;
    top: 56px;
    z-index: 800;
    border-bottom: 2px solid var(--hp-yellow);
}

.catalogue-toggle-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.65rem 1rem;
    background: transparent;
    border: none;
    color: var(--hp-white);
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s ease;
}

.catalogue-toggle-btn:hover {
    background: rgba(255,255,255,0.1);
}

.catalogue-toggle-btn svg {
    width: 16px;
    height: 16px;
    fill: currentColor;
}

.catalogue-toggle-btn + .catalogue-toggle-btn {
    border-left: 1px solid rgba(255,255,255,0.15);
}

/* ===== MOBILE SIDEBAR CLOSE BUTTON ===== */
.sidebar-close-btn {
    display: none;
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    width: 28px;
    height: 28px;
    background: rgba(255,255,255,0.15);
    border: none;
    border-radius: 50%;
    color: var(--hp-white);
    font-size: 1.1rem;
    line-height: 1;
    cursor: pointer;
    z-index: 5;
    align-items: center;
    justify-content: center;
}

.sidebar-close-btn:hover {
    background: rgba(255,255,255,0.25);
}

/* ===== MOBILE OVERLAY BACKDROP ===== */
.catalogue-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 899;
    opacity: 0;
    transition: opacity 0.25s ease;
}

.catalogue-overlay--visible {
    display: block;
    opacity: 1;
}

/* ===== RESPONSIVE: MOBILE ===== */
@media (max-width: 992px) {
    .catalogue-frame-layout {
        display: block;
    }

    .catalogue-toggle-bar {
        display: flex;
    }

    .catalogue-sidebar--years,
    .catalogue-sidebar--countries {
        position: fixed;
        top: 0;
        height: 100vh;
        width: 280px;
        z-index: 900;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        box-shadow: 4px 0 20px rgba(0,0,0,0.15);
    }

    .catalogue-sidebar--years {
        left: 0;
        border-right: 1px solid var(--hp-gray);
    }

    .catalogue-sidebar--countries {
        right: 0;
        left: auto;
        transform: translateX(100%);
        border-left: 1px solid var(--hp-gray);
    }

    .catalogue-sidebar--years.is-open {
        transform: translateX(0);
    }

    .catalogue-sidebar--countries.is-open {
        transform: translateX(0);
    }

    .sidebar-close-btn {
        display: flex;
    }

    .catalogue-content-frame iframe {
        height: calc(100vh - 120px);
    }
}

@media (max-width: 480px) {
    .catalogue-sidebar--years,
    .catalogue-sidebar--countries {
        width: 260px;
    }
}