/* =====================================================================
   MAIN UI LAYER (post-design-system.css)
   Full polished rewrite — Always Three Things
   ===================================================================== */


/* ============================================================
   BASIC LAYOUT & GLOBAL
   ============================================================ */

html, body {
    height: 100%;
    background: var(--bg-primary);
    color: var(--text);
    margin: 0;
}

/* Page fade-in */
body {
    opacity: 0;
    animation: page-fade-in 350ms ease-out forwards;
    font-family: var(--font-body);
}

@keyframes page-fade-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.app-container {
    display: flex;
    min-height: 100vh;
    background: var(--bg-primary);
    overflow-x: hidden;
    transition: background-color var(--transition-med);
}


/* ============================================================
   SIDEBAR + DRAWER
   ============================================================ */

.sidebar {
    width: 270px;
    background: var(--bg-secondary);
    color: var(--text);
    padding: var(--space-6) 0;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: var(--z-nav);
    border-right: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition:
        transform var(--transition-med),
        background-color var(--transition-med),
        border-color var(--transition-med);
}

.sidebar-header {
    padding: 0 var(--space-6) var(--space-4);
    border-bottom: 1px solid var(--border);
}

.site-title {
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: 0.03em;
}

.sidebar-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: 0.65rem var(--space-6);
    color: var(--text-muted);
    text-decoration: none;
    border-left: 3px solid transparent;
    font-size: var(--font-size-sm);
    transition:
        background-color var(--transition-fast),
        border-color var(--transition-fast),
        color var(--transition-fast),
        transform var(--transition-fast);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.nav-link:hover {
    color: var(--text);
    background: var(--primary-soft);
    transform: translateX(2px);
}

.nav-link.active {
    color: var(--text);
    background: var(--primary-soft);
    border-left-color: var(--primary);
    font-weight: 600;
}

.sidebar-user {
    margin-top: auto;
    padding: var(--space-4) var(--space-4);
    border-top: 1px solid var(--border);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    margin-bottom: var(--space-2);
    color: var(--text);
    font-size: var(--font-size-sm);
}

.user-info i {
    font-size: 1.25rem;
    color: var(--primary);
}

.user-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.user-nav .nav-link {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
}

.sidebar-footer {
    margin-top: var(--space-6);
    padding: 0 var(--space-6);
    font-size: var(--font-size-xs);
}

.theme-toggle {
    display: flex;
    gap: var(--space-2);
    margin-top: var(--space-3);
}

/* Backdrop behind drawer */
.sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(2px);
    z-index: var(--z-overlay);
}

.sidebar-backdrop.visible {
    display: block;
}


/* ============================================================
   MAIN CONTENT + HEADER
   ============================================================ */

.main-content {
    flex: 1;
    padding: var(--space-6);
    padding-left: 300px;
    transition: padding var(--transition-med);
}

.content-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-4);
    opacity: 0;
    transform: translateY(-12px);
    animation: header-slide-in 500ms ease-out 100ms forwards;
}

.page-title {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
}

.page-title .photo-count,
.page-title .video-count {
    font-weight: 400;
    font-size: 1rem;
    color: var(--text-muted);
}

.content-wrapper {
    margin-top: var(--space-2);
}

@keyframes header-slide-in {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}


/* ============================================================
   MOBILE BEHAVIOR (DRAWER)
   ============================================================ */

.mobile-menu-toggle {
    display: none;
}

@media (max-width: 992px) {
    .sidebar {
        position: fixed;
        top: 0;
        left: 0;
        transform: translate3d(-100%, 0, 0);
        width: 270px;
        height: 100vh;
        background: var(--bg-secondary);
        box-shadow: var(--shadow-md);
        transition: transform 250ms ease-out;
        z-index: var(--z-modal);
        -webkit-font-smoothing: subpixel-antialiased;
    }

    .sidebar.open {
        transform: translate3d(0, 0, 0);
    }

    .main-content {
        padding-left: var(--space-4);
        padding-right: var(--space-4);
        margin-top: var(--space-6);
    }

    .mobile-menu-toggle {
        display: inline-flex;
        flex-direction: column;
        justify-content: space-between;
        width: 26px;
        height: 18px;
        border: none;
        background: transparent;
        padding: 0;
        cursor: pointer;
    }

    .mobile-menu-toggle span {
        display: block;
        height: 2px;
        border-radius: 999px;
        background: var(--text);
        transition:
            transform 150ms ease,
            opacity 150ms ease;
    }
}


/* ============================================================
   SEARCH BOX
   ============================================================ */

.search-container {
    margin-bottom: var(--space-6);
}

.search-box {
    background: var(--surface-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--space-3) var(--space-4);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    transition:
        border-color 150ms,
        box-shadow 150ms,
        transform 150ms;
}

.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-soft);
    transform: translateY(-2px);
}

.search-form {
    width: 100%;
}

.search-input-group {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    width: 100%;
}

.search-input {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--text);
    font-size: var(--font-size-md);
}

.search-input:focus {
    outline: none;
}

.search-button .search-icon {
    font-size: 1rem;
}

.clear-search-btn {
    font-size: 0.85rem;
}


/* ============================================================
   GRID SYSTEM
   ============================================================ */

.grid {
    display: grid;
    gap: var(--space-5);
}

.grid-3 {
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
}

@media (max-width: 768px) {
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
}


/* ============================================================
   CONTENT CARDS (Photos, Videos, Collections, Articles)
   ============================================================ */

.content-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow-sm);
    transition:
        transform var(--transition-med),
        box-shadow var(--transition-med),
        border-color var(--transition-med),
        background-color var(--transition-med);
    display: flex;
    flex-direction: column;
}

/* Initial grid stagger for normal (non-HTMX) loads */
.grid > .content-card {
    opacity: 0;
    transform: translateY(8px);
    animation: grid-stagger 450ms ease-out forwards;
}

.grid > .content-card:nth-child(1) { animation-delay: 0ms; }
.grid > .content-card:nth-child(2) { animation-delay: 40ms; }
.grid > .content-card:nth-child(3) { animation-delay: 80ms; }
.grid > .content-card:nth-child(4) { animation-delay: 120ms; }

@keyframes grid-stagger {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Dynamic fade-in class for HTMX-loaded cards */
.card-fade-in {
    animation: yss-card-fade-in 280ms ease-out;
}

@keyframes yss-card-fade-in {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.content-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-soft);
}

.card-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 3 / 2;
    background: var(--surface-alt);
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-med);
}

.content-card:hover .card-image img {
    transform: scale(1.04);
}

.card-image.placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-image.placeholder a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    color: var(--text-muted);
    text-decoration: none;
}

.card-image.placeholder i {
    font-size: 3rem;
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

.content-card:hover .card-image.placeholder i {
    opacity: 0.8;
}

.card-content {
    padding: var(--space-4);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.card-title {
    margin: 0;
}

.card-title a {
    color: var(--text);
    font-size: var(--font-size-lg);
    font-weight: 600;
    text-decoration: none;
}

.card-title a:hover {
    color: var(--primary);
}

.card-summary {
    margin-top: var(--space-2);
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    flex: 1;
}

.card-meta {
    margin-top: var(--space-4);
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    display: flex;
    justify-content: space-between;
    gap: var(--space-3);
    align-items: center;
}

/* Type badge */
.card-type {
    background: var(--primary-soft);
    color: var(--primary-dark);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
}

/* Small count text */
.card-count {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
}


/* ============================================================
   PHOTO GRID (THUMBNAILS)
   ============================================================ */

.photo-card {
    background: transparent;
    border-radius: var(--radius-md);
    overflow: hidden;
    position: relative;
    cursor: pointer;
    transition:
        transform var(--transition-fast),
        box-shadow var(--transition-fast);
}

.photo-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.photo-thumbnail {
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-md);
    background: var(--surface-alt);
}

.photo-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform var(--transition-med);
}

.photo-card:hover .photo-thumbnail img {
    transform: scale(1.04);
}

.download-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to top,
        rgba(15, 23, 42, 0.65),
        transparent
    );
    opacity: 0;
    display: flex;
    align-items: flex-end;
    justify-content: flex-end;
    padding: var(--space-3);
    transition: opacity var(--transition-med);
}

.photo-card:hover .download-overlay {
    opacity: 1;
}

.download-icon {
    background: rgba(15, 23, 42, 0.9);
    color: #fff;
    border-radius: 999px;
    padding: 0.35rem 0.7rem;
    font-size: var(--font-size-sm);
}

/* Placeholder */
.photo-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    background: var(--surface-alt);
    color: var(--text-muted);
}


/* ============================================================
   VIDEO GRID (THUMBNAILS)
   ============================================================ */

.video-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    display: flex;
    flex-direction: column;
    transition:
        transform var(--transition-med),
        box-shadow var(--transition-med),
        border-color var(--transition-med);
}

.video-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-soft);
}

.video-thumbnail {
    position: relative;
    overflow: hidden;
    background: var(--surface-alt);
}

.video-thumbnail img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
    transition: transform var(--transition-med);
}

.video-card:hover .video-thumbnail img {
    transform: scale(1.03);
}

.video-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
}

.play-button {
    pointer-events: auto;
    text-decoration: none;
    background: rgba(15, 23, 42, 0.9);
    color: #fff;
    border-radius: 999px;
    padding: 0.5rem 1.2rem;
    font-size: 1.1rem;
    box-shadow: var(--shadow-md);
}

.video-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 200px;
    background: var(--surface-alt);
    color: var(--text-muted);
}

.video-card-body {
    padding: var(--space-4);
}

.video-actions {
    margin-top: var(--space-3);
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}


/* ============================================================
   DETAIL PAGES (Photo / Video / Collection)
   ============================================================ */

.photo-page,
.video-page,
.collection-page {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.photo-header,
.video-header,
.collection-header {
    background: var(--surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    padding: var(--space-4);
    box-shadow: var(--shadow-sm);
}

.photo-layout,
.video-layout {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
    gap: var(--space-5);
}

.photo-main,
.video-main {
    background: var(--surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    padding: var(--space-3);
    box-shadow: var(--shadow-sm);
}

.photo-main-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-md);
}

.video-main-player {
    width: 100%;
    display: block;
    border-radius: var(--radius-md);
    background: #000;
}

.photo-info,
.video-info {
    background: var(--surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    padding: var(--space-4);
    box-shadow: var(--shadow-sm);
}

.collection-summary {
    margin-top: var(--space-2);
    color: var(--text-muted);
}

.collection-meta {
    margin-top: var(--space-2);
    display: flex;
    gap: var(--space-3);
    font-size: var(--font-size-xs);
}

.back-link {
    font-size: var(--font-size-sm);
}

.back-link a {
    color: var(--primary);
    text-decoration: none;
}

.back-link a:hover {
    text-decoration: underline;
}

@media (max-width: 900px) {
    .photo-layout,
    .video-layout {
        grid-template-columns: 1fr;
    }
}


/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0.55rem 1.25rem;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    font-weight: 500;
    font-size: var(--font-size-sm);
    text-decoration: none;
    transition:
        background-color var(--transition-fast),
        color var(--transition-fast),
        border-color var(--transition-fast),
        box-shadow var(--transition-fast),
        transform var(--transition-fast);
}

/* Primary */
.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 12px var(--primary-soft);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
}

/* Accent */
.btn-accent {
    background: var(--accent);
    color: #0A141A;
}

.btn-accent:hover {
    background: var(--accent);
    box-shadow: 0 4px 12px var(--accent-glow);
    transform: translateY(-2px);
}

/* Ghost */
.btn-ghost {
    background: transparent;
    border-color: var(--border);
    color: var(--text);
}

.btn-ghost:hover {
    border-color: var(--primary);
}


/* ============================================================
   PAGINATION
   ============================================================ */

.pagination {
    display: flex;
    gap: var(--space-3);
    justify-content: center;
    align-items: center;
    margin-top: var(--space-6);
}

.pagination button,
.pagination a {
    padding: 0.4rem 0.9rem;
    border-radius: var(--radius-sm);
    background: var(--surface-alt);
    border: 1px solid var(--border);
    color: var(--text);
    cursor: pointer;
    font-size: var(--font-size-sm);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.pagination button:hover,
.pagination a:hover {
    background: var(--primary-soft);
    border-color: var(--primary);
}


/* ============================================================
   LIGHTBOX (Enhanced)
   ============================================================ */

.lightbox {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(6px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: var(--z-modal);
    opacity: 0;
    transition: opacity 250ms ease-out;
}

.lightbox.open {
    display: flex;
    opacity: 1;
}

.lightbox-inner {
    position: relative;
    max-width: 95vw;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    animation: lightbox-pop-in 300ms ease-out;
}

.lightbox img {
    max-width: 100%;
    max-height: 80vh;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    object-fit: contain;
    transition: opacity 120ms ease-out;
}

@keyframes lightbox-pop-in {
    from { transform: scale(0.92) translateY(10px); opacity: 0; }
    to   { transform: scale(1) translateY(0); opacity: 1; }
}

.lightbox-close {
    position: absolute;
    top: -10px;
    right: -10px;
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: background var(--transition-fast), color var(--transition-fast);
}

.lightbox-close:hover {
    background: var(--primary);
    color: #fff;
}

.lightbox-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: var(--space-2);
}

.lightbox-nav-btn {
    background: var(--surface-alt);
    border: 1px solid var(--border);
    color: var(--text);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.lightbox-nav-btn:hover {
    background: var(--primary-soft);
    transform: translateY(-2px);
}

.lightbox-actions {
    margin-top: var(--space-2);
    display: flex;
    justify-content: center;
}

.lightbox-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-4);
    margin-top: var(--space-2);
}

.lightbox-caption {
    text-align: left;
    color: var(--text-muted);
    font-size: var(--font-size-sm);
    flex: 1;
}

.lightbox-download {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    white-space: nowrap;
}


/* ============================================================
   LOADING INDICATOR
   ============================================================ */

.loading-indicator {
    grid-column: 1 / -1;
    text-align: center;
    padding: 1.5rem 0;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.loading-indicator .spinner {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 3px solid rgba(148, 163, 184, 0.4);
    border-top-color: var(--primary);
    margin: 0 auto 0.5rem;
    animation: yss-spin 0.9s linear infinite;
}

@keyframes yss-spin {
    to { transform: rotate(360deg); }
}


/* ============================================================
   LOADING SKELETONS
   ============================================================ */

.skeleton-card {
    position: relative;
    overflow: hidden;
}

.skeleton-block {
    background: linear-gradient(
        90deg,
        rgba(148, 163, 184, 0.18) 0%,
        rgba(148, 163, 184, 0.35) 20%,
        rgba(148, 163, 184, 0.18) 40%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.4s ease-in-out infinite;
    border-radius: 999px;
}

[data-theme="dark"] .skeleton-block {
    background: linear-gradient(
        90deg,
        rgba(51, 65, 85, 0.6) 0%,
        rgba(71, 85, 105, 0.9) 20%,
        rgba(51, 65, 85, 0.6) 40%
    );
}

.skeleton-thumb {
    height: 180px;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-3);
}

.skeleton-line {
    height: 10px;
    margin-bottom: var(--space-2);
    max-width: 90%;
}

.skeleton-line.short {
    max-width: 60%;
}

.skeleton-line.tiny {
    max-width: 40%;
    height: 8px;
}

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


/* ============================================================
   ERROR MESSAGE BOX
   ============================================================ */

.error-message {
    grid-column: 1 / -1;
    text-align: center;
    padding: 2rem 1rem;
    border-radius: var(--radius-md);
    margin: 1rem 0;
    border: 1px solid var(--border-strong);
    background: rgba(220, 38, 38, 0.1);
    color: #991b1b;
}

[data-theme="dark"] .error-message {
    background: rgba(127, 29, 29, 0.9);
    border-color: rgba(248, 113, 113, 0.6);
    color: #fecaca;
}

.error-message button {
    background: #dc3545;
    color: #ffffff;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    margin-top: 1rem;
}

.error-message button:hover {
    background: #c82333;
}


/* ============================================================
   TOAST NOTIFICATIONS
   ============================================================ */

.toast-container {
    position: fixed;
    bottom: var(--space-4);
    right: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    z-index: var(--z-popover);
}

.toast {
    min-width: 260px;
    max-width: 360px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    padding: var(--space-3) var(--space-4);
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    font-size: var(--font-size-sm);
    animation: toast-slide-in 250ms ease-out;
}

.toast-icon {
    font-size: 1.2rem;
    margin-top: 2px;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    margin-bottom: 0.15rem;
}

.toast-message {
    color: var(--text-muted);
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 1rem;
    padding: 0;
}

.toast--success {
    border-color: rgba(34, 197, 94, 0.5);
}

.toast--error {
    border-color: rgba(248, 113, 113, 0.7);
}

.toast--info {
    border-color: rgba(59, 130, 246, 0.65);
}

@keyframes toast-slide-in {
    from {
        opacity: 0;
        transform: translateY(8px) translateX(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0) translateX(0);
    }
}


/* ============================================================
   RESPONSIVE SMALL TWEAKS
   ============================================================ */

@media (max-width: 600px) {
    .search-box {
        padding: var(--space-3);
    }
    .card-title a {
        font-size: 1.1rem;
    }
}