/**
 * HSDL Collections Page Styles
 * Dual-purpose: listing view (with filter/sort) + detail view
 * Follows HSDL Brand System v1.3.7
 */

/* ========================================
   LAYOUT & STRUCTURE
   ======================================== */

.topic-page {
    background-color: #F7F7F7;
    min-height: 100vh;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: #002B58;
    color: #FED402;
    padding: 8px 16px;
    text-decoration: none;
    z-index: 100;
}

.skip-link:focus {
    top: 0;
}

/* Breadcrumb */
.breadcrumb-nav {
    background-color: #F7F7F7;
    border-bottom: 1px solid #E5E5E5;
}

.breadcrumb-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 20px 32px;
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.breadcrumb-link {
    color: #666666;
    text-decoration: none;
    font-size: 14px;
    font-family: 'Myriad Pro', Helvetica, Arial, sans-serif;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: all 0.2s ease;
}

a.breadcrumb-link:hover {
    color: #0268BB;
    text-decoration: underline;
}

.breadcrumb-separator {
    color: #767676;
    font-size: 16px;
}

.breadcrumb-current {
    color: #0268BB;
    font-size: 14px;
    font-family: 'Myriad Pro', Helvetica, Arial, sans-serif;
}

/* ========================================
   LISTING MODE — Hero
   ======================================== */

/* Listing hero uses shared .page-header / .page-title / .page-subtitle from style.css */

.collections-listing-count {
    display: inline-block;
    background: rgba(255, 255, 255, 0.12);
    color: #FED402;
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.375rem 1rem;
    border-radius: 2px;
}

/* ========================================
   LISTING MODE — Filter/Sort Bar
   ======================================== */

.collections-filter-bar {
    background: #FFFFFF;
    border-bottom: 1px solid #E5E5E5;
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 10;
}

.collections-filter-tip {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px 8px;
}

.collections-filter-tip-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.5rem 0.75rem;
}

.collections-filter-tip-label {
    color: #002B58;
    font-size: 0.8125rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.collections-filter-tip-text {
    margin: 0;
    color: #5A5A5A;
    font-size: 0.9375rem;
    line-height: 1.5;
}

.collections-filter-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.25rem;
    flex-wrap: wrap;
}

/* Category Chips */
.collections-filter-chips {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    padding: 12px 0;
}

.collections-filter-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.4375rem 0.875rem;
    border: 1.5px solid #E5E5E5;
    background: #FFFFFF;
    color: #666666;
    font-size: 0.8125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: 'Myriad Pro', Helvetica, Arial, sans-serif;
}

.collections-filter-chip:hover {
    border-color: #0268BB;
    color: #0268BB;
}

.collections-filter-chip.active {
    background: #002B58;
    border-color: #002B58;
    color: #FFFFFF;
}

.collections-filter-chip-count {
    background: rgba(0, 0, 0, 0.08);
    padding: 0.0625rem 0.375rem;
    font-size: 0.75rem;
    font-weight: 700;
}

.collections-filter-chip.active .collections-filter-chip-count {
    background: rgba(255, 255, 255, 0.2);
}

/* Sort + Search Controls */
.collections-filter-controls {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.collections-search-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.collections-search-input-wrap i {
    position: absolute;
    left: 10px;
    color: #767676;
    font-size: 0.9375rem;
    pointer-events: none;
}

.collections-search-input-wrap input {
    padding: 0.4375rem 0.75rem 0.4375rem 2.25rem;
    border: 1.5px solid #E5E5E5;
    font-size: 0.8125rem;
    font-family: 'Myriad Pro', Helvetica, Arial, sans-serif;
    width: 200px;
    transition: border-color 0.2s ease;
}

.collections-search-input-wrap input:focus {
    outline: none;
    border-color: #0268BB;
}

.collections-search-input-wrap input::placeholder {
    color: #BBBBBB;
    opacity: 1;
}

.collections-sort-select {
    padding: 0.4375rem 2rem 0.4375rem 0.75rem;
    border: 1.5px solid #E5E5E5;
    font-size: 0.8125rem;
    font-family: 'Myriad Pro', Helvetica, Arial, sans-serif;
    background: #FFFFFF url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24'%3E%3Cpath fill='%23666' d='M12 16l-6-6h12z'/%3E%3C/svg%3E") no-repeat right 10px center;
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
}

.collections-sort-select:focus {
    outline: none;
    border-color: #0268BB;
}

/* ========================================
   LISTING MODE — Collections Grid
   ======================================== */

.collections-listing-section {
    padding: 48px 0;
}

.collections-listing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

/* Split Card — image top, content bottom */
.collections-listing-card {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    background: #FFFFFF;
    border: 1px solid #E5E5E5;
    overflow: hidden;
    transition: all 0.3s ease;
}

.collections-listing-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 43, 88, 0.12);
    border-color: #0268BB;
}

/* Image portion */
.collections-listing-card-image {
    position: relative;
    height: 200px;
    overflow: hidden;
    background: #E0E0E0;
}

.collections-listing-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.collections-listing-card:hover .collections-listing-card-image img {
    transform: scale(1.05);
}

/* Category badge (top-left over image) */
.collections-listing-card-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    display: inline-block;
    padding: 0.25rem 0.625rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: #FFFFFF;
    z-index: 1;
}

/* Category badge colors */
.badge-cat-government { background: #002B58; }
.badge-cat-preparedness { background: #B45309; }
.badge-cat-policy { background: #7C3AED; }
.badge-cat-research { background: #059669; }
.badge-cat-emergency-management { background: #DC2626; }

/* Content portion */
.collections-listing-card-content {
    padding: 1.25rem 1.5rem 1.5rem;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.collections-listing-card-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: #002B58;
    margin: 0 0 0.5rem;
    line-height: 1.3;
}

.collections-listing-card:hover .collections-listing-card-title {
    color: #0268BB;
}

.collections-listing-card-desc {
    font-size: 0.875rem;
    color: #666666;
    line-height: 1.6;
    margin: 0;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.collections-listing-card-count {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: #767676;
    margin-top: 0.75rem;
}

.collections-listing-card-arrow {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: #0268BB;
    font-size: 0.875rem;
    font-weight: 600;
    margin-top: 1rem;
    transition: gap 0.3s ease;
}

.collections-listing-card:hover .collections-listing-card-arrow {
    gap: 0.75rem;
}

/* ========================================
   LISTING MODE — Empty Filter State
   ======================================== */

.collections-empty-filter {
    text-align: center;
    padding: 4rem 2rem;
    color: #767676;
}

.collections-empty-filter i {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.collections-empty-filter p {
    font-size: 1.0625rem;
    margin: 0 0 1.5rem;
}

/* ========================================
   LISTING MODE — CTA Section
   ======================================== */

.collections-cta-section {
    background: #FFFFFF;
    border-top: 1px solid #E5E5E5;
    padding: 64px 0;
}

.collections-cta-inner {
    text-align: center;
    max-width: 540px;
    margin: 0 auto;
}

.collections-cta-icon {
    font-size: 2.5rem;
    color: #0268BB;
    margin-bottom: 1rem;
    display: block;
}

.collections-cta-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: #002B58;
    margin: 0 0 0.75rem;
}

.collections-cta-text {
    font-size: 1rem;
    color: #666666;
    line-height: 1.6;
    margin: 0 0 1.5rem;
}

/* ========================================
   DETAIL MODE — Hero
   ======================================== */

.topic-hero {
    position: relative;
    width: 100%;
    height: 420px;
    overflow: hidden;
    background: #002B58;
}

.topic-hero-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.topic-hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to top,
        rgba(0, 43, 88, 0.95) 0%,
        rgba(0, 43, 88, 0.6) 50%,
        rgba(0, 43, 88, 0.3) 100%
    );
    display: flex;
    align-items: flex-end;
}

.topic-hero-content {
    max-width: 1280px;
    width: 100%;
    margin: 0 auto;
    padding: 0 32px 48px;
}

.topic-hero-label {
    display: inline-block;
    background: #FED402;
    color: #002B58;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    padding: 0.375rem 0.875rem;
    margin-bottom: 1rem;
}

.topic-hero-title {
    font-size: 3rem;
    font-weight: 700;
    color: #FFFFFF;
    margin: 0;
    line-height: 1.15;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.topic-hero-skeleton {
    width: 100%;
    height: 420px;
    background: #E0E0E0;
    display: flex;
    align-items: flex-end;
    padding: 48px 32px;
}

/* ========================================
   DETAIL MODE — Description
   ======================================== */

.topic-description-section {
    background: #FFFFFF;
    border-bottom: 1px solid #E5E5E5;
}

.topic-content-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 32px;
}

.topic-description {
    font-size: 1.125rem;
    line-height: 1.8;
    color: #444444;
    margin: 0;
    padding: 40px 0;
    border-left: 4px solid #0268BB;
    padding-left: 24px;
}

/* ========================================
   DETAIL MODE — Documents
   ======================================== */

.topic-documents-section {
    padding: 48px 0;
}

.topic-documents-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 2rem;
}

.topic-documents-heading {
    font-size: 1.75rem;
    font-weight: 700;
    color: #002B58;
    margin: 0;
}

.topic-documents-count {
    font-size: 0.9375rem;
    color: #888888;
    font-weight: 500;
}

.topic-documents-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
}

/* Document Card */
.topic-doc-card {
    background: #FFFFFF;
    border: 1px solid #E5E5E5;
    padding: 1.5rem;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    transition: all 0.2s ease;
}

.topic-doc-card:hover {
    border-color: #0268BB;
    box-shadow: 0 4px 16px rgba(2, 104, 187, 0.1);
    transform: translateY(-2px);
}

.topic-doc-badges {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.topic-doc-badge {
    display: inline-block;
    padding: 0.25rem 0.625rem;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: white;
}

.topic-doc-date {
    font-size: 0.8125rem;
    color: #767676;
}

.topic-doc-title {
    font-size: 1.0625rem;
    font-weight: 600;
    color: #002B58;
    margin: 0 0 0.5rem;
    line-height: 1.4;
}

.topic-doc-card:hover .topic-doc-title {
    color: #0268BB;
}

.topic-doc-excerpt {
    font-size: 0.875rem;
    color: #666666;
    line-height: 1.6;
    margin: 0;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.topic-doc-meta {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    padding-top: 0.75rem;
    border-top: 1px solid #F0F0F0;
    font-size: 0.8125rem;
    color: #767676;
}

.topic-doc-meta i {
    margin-right: 0.25rem;
    font-size: 0.875rem;
}

/* Empty State */
.topic-empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: #767676;
}

.topic-empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.topic-empty-state p {
    font-size: 1.0625rem;
    margin: 0;
}

/* Load More */
.topic-load-more {
    text-align: center;
    padding: 2rem 0 0;
}

.topic-btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    background: #FFFFFF;
    color: #002B58;
    border: 2px solid #002B58;
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.topic-btn-secondary:hover {
    background: #002B58;
    color: #FFFFFF;
}

.topic-btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ========================================
   DETAIL MODE — Related Collections
   ======================================== */

.topic-related-section {
    background: #FFFFFF;
    border-top: 1px solid #E5E5E5;
    padding: 48px 0;
}

.topic-related-heading {
    font-size: 1.25rem;
    font-weight: 700;
    color: #002B58;
    margin: 0 0 1.5rem;
}

.topic-related-grid {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.topic-related-card {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1.25rem;
    background: #F7F7F7;
    border: 1px solid #E5E5E5;
    text-decoration: none;
    color: #002B58;
    font-size: 0.9375rem;
    font-weight: 600;
    transition: all 0.2s ease;
}

.topic-related-card:hover {
    background: #002B58;
    color: #FFFFFF;
    border-color: #002B58;
}

.topic-related-card i {
    color: #FED402;
    font-size: 1.125rem;
}

.topic-related-card:hover i {
    color: #FED402;
}

/* ========================================
   ERROR STATE
   ======================================== */

.topic-error-state {
    text-align: center;
    padding: 6rem 2rem;
    max-width: 500px;
    margin: 0 auto;
}

.topic-error-icon {
    font-size: 3.5rem;
    color: #CC0000;
    margin-bottom: 1.5rem;
    display: block;
}

.topic-error-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: #002B58;
    margin: 0 0 0.75rem;
}

.topic-error-message {
    font-size: 1.0625rem;
    color: #666666;
    margin: 0 0 2rem;
    line-height: 1.6;
}

.topic-btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 2rem;
    background: #002B58;
    color: #FFFFFF;
    text-decoration: none;
    font-size: 0.9375rem;
    font-weight: 600;
    transition: all 0.2s ease;
}

.topic-btn-primary:hover {
    background: #003d7a;
}

/* ========================================
   SKELETON LOADING
   ======================================== */

.skeleton {
    background: linear-gradient(90deg, #E0E0E0 25%, #F0F0F0 50%, #E0E0E0 75%);
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s infinite;
    border-radius: 2px;
}

@keyframes skeleton-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-rect {
    display: block;
    width: 100%;
}

.skeleton-text {
    display: block;
    height: 1rem;
    margin-bottom: 0.5rem;
}

.skeleton-text--long {
    width: 90%;
}

.skeleton-text--medium {
    width: 60%;
}

.skeleton-document-card {
    background: #FFFFFF;
    border: 1px solid #E5E5E5;
    padding: 1.5rem;
}

/* ========================================
   RESPONSIVE
   ======================================== */

@media (max-width: 1024px) {
    .collections-listing-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .topic-documents-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .topic-hero-title {
        font-size: 2.5rem;
    }
}

@media (max-width: 768px) {
    /* Detail hero */
    .topic-hero {
        height: 320px;
    }

    .topic-hero-title {
        font-size: 2rem;
    }

    .topic-hero-content {
        padding: 0 20px 32px;
    }

    .topic-content-container {
        padding: 0 20px;
    }

    .breadcrumb-container {
        padding: 16px 20px;
    }

    .topic-documents-grid {
        grid-template-columns: 1fr;
    }

    .topic-documents-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .topic-related-grid {
        flex-direction: column;
    }

    .topic-related-card {
        width: 100%;
    }

    .topic-description {
        font-size: 1rem;
        padding: 32px 0;
        padding-left: 15px;
    }

    /* Listing hero responsive handled by style.css .page-header */

    /* Filter bar — stack vertically */
    .collections-filter-container {
        flex-direction: column;
        align-items: stretch;
        padding: 0 20px;
    }

    .collections-filter-tip {
        padding: 0 20px 8px;
    }

    .collections-filter-tip-inner {
        align-items: flex-start;
    }

    .collections-filter-chips {
        overflow-x: auto;
        flex-wrap: nowrap;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        padding-bottom: 4px;
    }

    .collections-filter-chips::-webkit-scrollbar {
        display: none;
    }

    .collections-filter-chip {
        white-space: nowrap;
        flex-shrink: 0;
    }

    .collections-filter-controls {
        width: 100%;
    }

    .collections-search-input-wrap {
        flex: 1;
    }

    .collections-search-input-wrap input {
        width: 100%;
    }

    /* Listing grid — 1 column */
    .collections-listing-grid {
        grid-template-columns: 1fr;
    }

    /* CTA */
    .collections-cta-section {
        padding: 48px 20px;
    }
}

/* Accessibility - Focus-visible Styles */
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
button:focus-visible,
a:focus-visible {
    background-color: #E8F4FF;
    padding-left: 15px;
}

@media (max-width: 480px) {
    .topic-hero {
        height: 260px;
    }

    .topic-hero-title {
        font-size: 1.625rem;
    }

    .topic-hero-label {
        font-size: 0.75rem;
        padding: 0.25rem 0.625rem;
    }

    /* Listing hero responsive handled by style.css .page-header */

    .collections-listing-card-image {
        height: 160px;
    }
}