/**
 * Smart Docs & Gallery Showcase – Frontend Styles
 * Theme: Premium Institutional — Deep Navy + Gold
 *
 * Palette:
 *   --sdg-navy-deep    #0b1b3b   (page background blend)
 *   --sdg-navy-card    #112050   (card surface)
 *   --sdg-navy-hover   #162868   (card hover)
 *   --sdg-gold         #d4af37
 *   --sdg-text         #f0f4ff
 *   --sdg-muted        rgba(200,212,255,0.55)
 */

/* ── Custom Properties ────────────────────────────────────────────────────── */
:root {
    --sdg-navy-deep:    #0b1b3b;
    --sdg-navy-card:    #112050;
    --sdg-navy-hover:   #162868;
    --sdg-navy-input:   #0d1e45;
    --sdg-gold:         #d4af37;
    --sdg-gold-hover:   #b8961f;
    --sdg-gold-dim:     rgba(212,175,55,0.12);
    --sdg-gold-glow:    rgba(212,175,55,0.22);
    --sdg-border:       rgba(212,175,55,0.18);
    --sdg-border-hover: rgba(212,175,55,0.50);
    --sdg-text:         #f0f4ff;
    --sdg-muted:        rgba(200,212,255,0.55);
    --sdg-divider:      rgba(200,212,255,0.10);
    --sdg-radius:       14px;
    --sdg-radius-sm:    8px;
    --sdg-transition:   all .3s ease;
    --sdg-shadow-card:  0 4px 24px rgba(0,0,0,0.30);
    --sdg-shadow-hover: 0 12px 40px rgba(0,0,0,0.45), 0 0 0 1px var(--sdg-border-hover), 0 0 24px var(--sdg-gold-glow);
}

/* ── Base Reset ───────────────────────────────────────────────────────────── */
.sdg-wrap *,
.sdg-lightbox * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

.sdg-wrap {
    font-family: 'Georgia', 'Times New Roman', serif;
    color: var(--sdg-text);
    line-height: 1.65;
    margin: 0 0 56px;
}

/* ══════════════════════════════════════════════════════════════════════════
   SECTION HEADER
═══════════════════════════════════════════════════════════════════════════ */
.sdg-section-header {
    margin-bottom: 36px;
}

.sdg-section-title {
    font-family: 'Georgia', serif;
    font-size: clamp(26px, 4vw, 40px);
    font-weight: 700;
    color: var(--sdg-text);
    letter-spacing: -0.02em;
    line-height: 1.2;
    position: relative;
    display: inline-block;
    padding-bottom: 14px;
}

.sdg-section-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 52px;
    height: 3px;
    background: linear-gradient(90deg, var(--sdg-gold), rgba(212,175,55,0));
    border-radius: 2px;
}

/* ══════════════════════════════════════════════════════════════════════════
   FILTER BAR
═══════════════════════════════════════════════════════════════════════════ */
.sdg-filter-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px;
    margin-bottom: 32px;
}

.sdg-search-box {
    position: relative;
    flex: 1 1 240px;
    max-width: 380px;
}

.sdg-search-input {
    width: 100%;
    padding: 11px 18px 11px 44px;
    border: 1.5px solid var(--sdg-border);
    border-radius: var(--sdg-radius-sm);
    font-size: 14px;
    font-family: inherit;
    color: var(--sdg-text);
    background: var(--sdg-navy-input);
    transition: var(--sdg-transition);
    outline: none;
    letter-spacing: 0.01em;
}

.sdg-search-input::placeholder {
    color: var(--sdg-muted);
}

.sdg-search-input:focus {
    border-color: var(--sdg-gold);
    box-shadow: 0 0 0 3px var(--sdg-gold-dim), 0 0 12px var(--sdg-gold-glow);
    background: #0f2255;
}

.sdg-search-icon {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    width: 17px;
    height: 17px;
    color: var(--sdg-muted);
    pointer-events: none;
    transition: color .3s;
}

.sdg-search-box:focus-within .sdg-search-icon {
    color: var(--sdg-gold);
}

.sdg-cat-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.sdg-cat-btn {
    padding: 8px 18px;
    border-radius: 50px;
    border: 1.5px solid var(--sdg-border);
    background: transparent;
    color: var(--sdg-muted);
    font-size: 12px;
    font-family: inherit;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    cursor: pointer;
    transition: var(--sdg-transition);
}

.sdg-cat-btn:hover {
    border-color: var(--sdg-gold);
    color: var(--sdg-gold);
    background: var(--sdg-gold-dim);
}

.sdg-cat-btn.sdg-cat-active {
    background: var(--sdg-gold);
    border-color: var(--sdg-gold);
    color: var(--sdg-navy-deep);
    font-weight: 700;
}

/* ══════════════════════════════════════════════════════════════════════════
   DOCUMENTS GRID
═══════════════════════════════════════════════════════════════════════════ */
.sdg-docs-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

@media (max-width: 920px) {
    .sdg-docs-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 560px) {
    .sdg-docs-grid { grid-template-columns: 1fr; }
}

/* Entrance animation */
@keyframes sdg-risein {
    from { opacity: 0; transform: translateY(22px); }
    to   { opacity: 1; transform: translateY(0); }
}

.sdg-doc-card {
    animation: sdg-risein .5s cubic-bezier(.22,1,.36,1) both;
}
.sdg-doc-card:nth-child(1) { animation-delay: .04s; }
.sdg-doc-card:nth-child(2) { animation-delay: .10s; }
.sdg-doc-card:nth-child(3) { animation-delay: .16s; }
.sdg-doc-card:nth-child(4) { animation-delay: .22s; }
.sdg-doc-card:nth-child(5) { animation-delay: .28s; }
.sdg-doc-card:nth-child(6) { animation-delay: .34s; }

.sdg-doc-card.sdg-hidden {
    display: none;
}

/* Card shell */
.sdg-doc-card-inner {
    background: var(--sdg-navy-card);
    border: 1px solid var(--sdg-border);
    border-radius: var(--sdg-radius);
    padding: 28px 26px 24px;
    display: flex;
    flex-direction: column;
    height: 100%;
    box-shadow: var(--sdg-shadow-card);
    transition: transform .3s cubic-bezier(.22,1,.36,1), box-shadow .3s ease, border-color .3s ease, background .3s ease;
}

.sdg-doc-card:hover .sdg-doc-card-inner {
    transform: translateY(-5px);
    background: var(--sdg-navy-hover);
    border-color: rgba(212,175,55,0.45);
    box-shadow: var(--sdg-shadow-hover);
}

/* File type badge */
.sdg-doc-icon-wrap {
    margin-bottom: 20px;
}

.sdg-doc-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    border-radius: 10px;
    background: color-mix(in srgb, var(--sdg-icon-color, #94a3b8) 14%, transparent);
    border: 1px solid color-mix(in srgb, var(--sdg-icon-color, #94a3b8) 28%, transparent);
}

.sdg-doc-ext {
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.06em;
    font-family: 'Courier New', monospace;
    color: var(--sdg-icon-color, #94a3b8);
}

/* Body */
.sdg-doc-body {
    flex: 1;
}

.sdg-doc-title {
    font-family: 'Georgia', serif;
    font-size: 18px;
    font-weight: 700;
    color: var(--sdg-text);
    line-height: 1.3;
    margin-bottom: 10px;
    letter-spacing: -0.01em;
}

.sdg-doc-desc {
    font-size: 13.5px;
    color: var(--sdg-muted);
    line-height: 1.6;
    margin-bottom: 14px;
}

.sdg-doc-cats {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 20px;
}

.sdg-cat-tag {
    font-size: 10px;
    font-weight: 700;
    color: var(--sdg-gold);
    background: var(--sdg-gold-dim);
    border: 1px solid rgba(212,175,55,0.25);
    border-radius: 50px;
    padding: 3px 10px;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    font-family: 'Courier New', monospace;
}

/* Action row */
.sdg-doc-actions {
    display: flex;
    gap: 10px;
    margin-top: auto;
    padding-top: 18px;
    border-top: 1px solid var(--sdg-divider);
}

/* Buttons */
.sdg-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    padding: 9px 16px;
    border-radius: var(--sdg-radius-sm);
    font-size: 13px;
    font-weight: 700;
    font-family: inherit;
    letter-spacing: 0.04em;
    text-decoration: none !important;
    transition: var(--sdg-transition);
    cursor: pointer;
    border: none;
    flex: 1;
}

.sdg-btn svg {
    width: 15px;
    height: 15px;
    flex-shrink: 0;
}

/* View – gold outline */
.sdg-btn-view {
    background: transparent;
    color: var(--sdg-gold) !important;
    border: 1.5px solid var(--sdg-gold);
}

.sdg-btn-view:hover {
    background: var(--sdg-gold);
    color: var(--sdg-navy-deep) !important;
    box-shadow: 0 0 14px var(--sdg-gold-glow);
}

/* Download – solid gold */
.sdg-btn-download {
    background: var(--sdg-gold);
    color: var(--sdg-navy-deep) !important;
    border: 1.5px solid var(--sdg-gold);
}

.sdg-btn-download:hover {
    background: var(--sdg-gold-hover);
    border-color: var(--sdg-gold-hover);
    box-shadow: 0 0 14px var(--sdg-gold-glow);
}

/* No results */
.sdg-no-results {
    grid-column: 1 / -1;
    text-align: center;
    padding: 64px 20px;
    color: var(--sdg-muted);
}

.sdg-no-results svg {
    width: 52px;
    height: 52px;
    margin-bottom: 16px;
    color: rgba(212,175,55,0.25);
}

.sdg-no-results p {
    font-size: 16px;
}

/* Pagination */
.sdg-pagination {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 40px;
}

.sdg-pagination .page-numbers {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 14px;
    border-radius: var(--sdg-radius-sm);
    border: 1.5px solid var(--sdg-border);
    background: transparent;
    color: var(--sdg-muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    transition: var(--sdg-transition);
}

.sdg-pagination .page-numbers:hover {
    border-color: var(--sdg-gold);
    color: var(--sdg-gold);
    background: var(--sdg-gold-dim);
}

.sdg-pagination .page-numbers.current {
    background: var(--sdg-gold);
    border-color: var(--sdg-gold);
    color: var(--sdg-navy-deep);
    font-weight: 700;
}

/* ══════════════════════════════════════════════════════════════════════════
   IMAGE GALLERY
═══════════════════════════════════════════════════════════════════════════ */
.sdg-gallery-masonry {
    columns: 3 280px;
    column-gap: 16px;
}

@media (max-width: 700px) {
    .sdg-gallery-masonry { columns: 2 180px; }
}

@media (max-width: 420px) {
    .sdg-gallery-masonry { columns: 1; }
}

.sdg-gallery-item {
    break-inside: avoid;
    margin-bottom: 16px;
    cursor: pointer;
}

/* Gallery entrance */
@keyframes sdg-galleryin {
    from { opacity: 0; transform: scale(.94); }
    to   { opacity: 1; transform: scale(1); }
}

.sdg-gallery-item {
    animation: sdg-galleryin .5s cubic-bezier(.22,1,.36,1) both;
}
.sdg-gallery-item:nth-child(2) { animation-delay: .05s; }
.sdg-gallery-item:nth-child(3) { animation-delay: .10s; }
.sdg-gallery-item:nth-child(4) { animation-delay: .15s; }
.sdg-gallery-item:nth-child(5) { animation-delay: .20s; }
.sdg-gallery-item:nth-child(6) { animation-delay: .25s; }
.sdg-gallery-item:nth-child(7) { animation-delay: .30s; }
.sdg-gallery-item:nth-child(8) { animation-delay: .35s; }

.sdg-gallery-img-wrap {
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    border: 1px solid var(--sdg-border);
    box-shadow: var(--sdg-shadow-card);
    transition: transform .3s cubic-bezier(.22,1,.36,1), box-shadow .3s ease, border-color .3s ease;
}

.sdg-gallery-item:hover .sdg-gallery-img-wrap {
    transform: translateY(-4px);
    border-color: rgba(212,175,55,0.45);
    box-shadow: 0 16px 40px rgba(0,0,0,0.5), 0 0 20px var(--sdg-gold-glow);
}

.sdg-gallery-img {
    display: block;
    width: 100%;
    height: auto;
    transition: transform .4s cubic-bezier(.22,1,.36,1);
}

.sdg-gallery-item:hover .sdg-gallery-img {
    transform: scale(1.06);
}

/* Overlay */
.sdg-gallery-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to top,
        rgba(11,27,59,.88) 0%,
        rgba(11,27,59,.4) 55%,
        rgba(11,27,59,.05) 100%
    );
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    transition: opacity .3s ease;
    border-radius: 12px;
}

.sdg-gallery-item:hover .sdg-gallery-overlay {
    opacity: 1;
}

.sdg-overlay-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 9px;
    text-align: center;
    transform: translateY(12px);
    transition: transform .35s cubic-bezier(.22,1,.36,1);
}

.sdg-gallery-item:hover .sdg-overlay-inner {
    transform: translateY(0);
}

.sdg-zoom-icon {
    width: 40px;
    height: 40px;
    background: rgba(212,175,55,0.15);
    border: 1.5px solid rgba(212,175,55,0.55);
    border-radius: 50%;
    padding: 9px;
    color: var(--sdg-gold);
    backdrop-filter: blur(4px);
    transition: background .3s, transform .3s;
}

.sdg-gallery-item:hover .sdg-zoom-icon {
    background: rgba(212,175,55,0.28);
    transform: scale(1.1);
}

.sdg-overlay-title {
    font-size: 13px;
    font-weight: 600;
    color: rgba(240,244,255,0.9);
    max-width: 90%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    letter-spacing: 0.02em;
}

/* ══════════════════════════════════════════════════════════════════════════
   LIGHTBOX
═══════════════════════════════════════════════════════════════════════════ */
.sdg-lightbox {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 99999;
    align-items: center;
    justify-content: center;
}

.sdg-lightbox.sdg-lb-open {
    display: flex;
}

.sdg-lb-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(5,12,28,.96);
    backdrop-filter: blur(10px);
    cursor: pointer;
}

.sdg-lb-inner {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 1000px;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 24px;
}

.sdg-lb-img-wrap {
    width: 100%;
    max-height: 76vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sdg-lb-img {
    max-width: 100%;
    max-height: 76vh;
    object-fit: contain;
    border-radius: 12px;
    border: 1px solid var(--sdg-border);
    box-shadow: 0 28px 80px rgba(0,0,0,0.65), 0 0 0 1px rgba(212,175,55,0.1);
    transition: opacity .3s ease;
}

.sdg-lb-img.sdg-lb-loading {
    opacity: 0;
}

.sdg-lb-caption {
    margin-top: 16px;
    color: rgba(240,244,255,0.65);
    font-size: 14px;
    font-family: 'Georgia', serif;
    font-style: italic;
    text-align: center;
    min-height: 22px;
}

.sdg-lb-counter {
    margin-top: 5px;
    color: var(--sdg-gold);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    text-align: center;
    font-family: 'Courier New', monospace;
}

/* Lightbox controls */
.sdg-lb-close,
.sdg-lb-prev,
.sdg-lb-next {
    position: fixed;
    background: rgba(17,32,80,0.8);
    border: 1.5px solid var(--sdg-border);
    border-radius: 50%;
    color: var(--sdg-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background .25s, border-color .25s, transform .25s, color .25s;
    backdrop-filter: blur(8px);
    z-index: 2;
}

.sdg-lb-close {
    top: 20px;
    right: 20px;
    width: 46px;
    height: 46px;
}

.sdg-lb-close svg { width: 20px; height: 20px; }

.sdg-lb-prev,
.sdg-lb-next {
    top: 50%;
    transform: translateY(-50%);
    width: 50px;
    height: 50px;
}

.sdg-lb-prev { left: 18px; }
.sdg-lb-next { right: 18px; }

.sdg-lb-prev svg,
.sdg-lb-next svg { width: 22px; height: 22px; }

.sdg-lb-close:hover {
    background: rgba(212,175,55,0.18);
    border-color: var(--sdg-gold);
    color: var(--sdg-gold);
}

.sdg-lb-prev:hover {
    background: rgba(212,175,55,0.18);
    border-color: var(--sdg-gold);
    color: var(--sdg-gold);
    transform: translateY(-50%) translateX(-3px);
}

.sdg-lb-next:hover {
    background: rgba(212,175,55,0.18);
    border-color: var(--sdg-gold);
    color: var(--sdg-gold);
    transform: translateY(-50%) translateX(3px);
}

@media (max-width: 600px) {
    .sdg-lb-prev { left: 8px; }
    .sdg-lb-next { right: 8px; }
}