/* ==============================================================
   SLIDE PANEL — PPT-style Expanded Slide Thumbnail Sidebar
   A wide, right-side panel showing slide thumbnails like MS PPT.
   Toggled via a small floating expand button.
   ============================================================== */

/* ─── Expand / Collapse Toggle Button ─────────────────────── */
/* This sits at the TOP of the .slide-thumbnails-container */
.slide-panel-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 20px;
    background: transparent;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 0.55rem;
    transition: all 0.2s cubic-bezier(0.2, 0.8, 0.2, 1);
    opacity: 0.6;
    padding: 0;
    margin-bottom: 4px;
    flex-shrink: 0;
}

.slide-panel-toggle:hover {
    opacity: 1;
    color: var(--accent-dynamic);
    background: var(--bg-item);
    transform: scale(1.05);
}

/* ─── The Panel Itself ────────────────────────────────────── */
.slide-panel-sidebar {
    position: fixed;
    right: 0;
    top: 100px;
    width: 220px;
    height: calc(100vh - 180px);
    background: var(--bg-surface-solid);
    border-left: 1px solid var(--border-glass);
    border-radius: 10px 0 0 10px;
    z-index: 1050;
    display: flex;
    flex-direction: column;
    box-shadow: -10px 0 40px rgba(0, 0, 0, 0.3);
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1), width 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
    overflow: hidden;
}

.slide-panel-sidebar.open {
    transform: translateX(0);
}

/* ─── Header ─────────────────────────────────────────────── */
.slide-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 16px 10px;
    border-bottom: 1px solid var(--border-glass);
    flex-shrink: 0;
}

.slide-panel-title {
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.slide-panel-title i {
    font-size: 0.7rem;
    color: var(--accent-dynamic);
}

.slide-panel-close {
    width: 28px;
    height: 28px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.slide-panel-close:hover {
    background: var(--bg-item);
    color: var(--danger);
    transform: scale(1.1);
}

/* ─── Slide Counter ──────────────────────────────────────── */
.slide-panel-counter {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px 16px;
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 600;
    border-bottom: 1px solid var(--border-glass);
    flex-shrink: 0;
    gap: 6px;
}

.slide-panel-counter .sp-current {
    color: var(--accent-dynamic);
    font-size: 0.9rem;
    font-weight: 800;
}

/* ─── Thumbnails Scroll Area ─────────────────────────────── */
.slide-panel-list {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 12px 12px 80px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-y;
    overscroll-behavior: contain;
    min-height: 0;
}

.slide-panel-list::-webkit-scrollbar {
    width: 8px;
}

.slide-panel-list::-webkit-scrollbar-track {
    background: rgba(128, 128, 128, 0.06);
    border-radius: 4px;
}

.slide-panel-list::-webkit-scrollbar-thumb {
    background: rgba(128, 128, 128, 0.3);
    border-radius: 4px;
    border: 2px solid transparent;
    background-clip: padding-box;
    min-height: 40px;
}

.slide-panel-list::-webkit-scrollbar-thumb:hover {
    background: rgba(128, 128, 128, 0.5);
    border: 2px solid transparent;
    background-clip: padding-box;
}

/* ─── Slide Thumbnail Card ───────────────────────────────── */
.sp-thumb-card {
    position: relative;
    width: 100%;
    border-radius: 6px;
    border: 2px solid transparent;
    cursor: pointer;
    background: var(--bg-item);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    flex-shrink: 0;
    overflow: hidden;
}

.sp-thumb-card:hover {
    border-color: rgba(255, 255, 255, 0.15);
    transform: scale(1.02);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

.sp-thumb-card.active {
    border-color: var(--accent-dynamic);
    box-shadow: 0 0 0 3px rgba(249, 202, 36, 0.25), 0 4px 16px rgba(0, 0, 0, 0.2);
    transform: scale(1.01);
}

/* Drag States */
.sp-thumb-card.dragging {
    opacity: 0.35;
    transform: scale(0.96);
}

.sp-thumb-card.drag-over {
    margin-top: 55px;
    transition: margin-top 0.25s ease;
}

.sp-thumb-card.drag-over::before {
    content: "";
    position: absolute;
    top: -50px;
    left: 8px;
    right: 8px;
    height: 44px;
    border: 2px dashed var(--accent-dynamic);
    background: rgba(249, 202, 36, 0.05);
    border-radius: 6px;
}

/* ─── Thumbnail Image Wrapper ────────────────────────────── */
.sp-thumb-img-wrap {
    width: 100%;
    aspect-ratio: 16 / 10;
    background: #f1f5f9;
    border-radius: 4px 4px 0 0;
    overflow: hidden;
    position: relative;
}

[data-theme="dark"] .sp-thumb-img-wrap,
:root:not([data-theme="light"]) .sp-thumb-img-wrap {
    background: rgba(30, 41, 59, 0.6);
}

.sp-thumb-img-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.sp-thumb-img-wrap img.sp-lazy {
    opacity: 0;
    transition: opacity 0.35s ease-in-out;
    background: linear-gradient(90deg,
            var(--bg-item) 0%,
            var(--bg-item-hover) 50%,
            var(--bg-item) 100%);
    background-size: 200% 100%;
    animation: spShimmer 1.5s infinite linear;
}

.sp-thumb-img-wrap img.sp-lazy.sp-loaded,
.sp-thumb-img-wrap img.sp-lazy:not([data-src]) {
    opacity: 1;
    animation: none;
    background: transparent;
}

@keyframes spShimmer {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}

/* ─── Slide Number Badge ─────────────────────────────────── */
.sp-thumb-number {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 5px 8px;
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--text-muted);
}

.sp-thumb-number .sp-num {
    display: flex;
    align-items: center;
    gap: 4px;
}

.sp-thumb-number .sp-num-badge {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    background: var(--bg-item-hover);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    font-weight: 800;
    color: var(--text-main);
}

.sp-thumb-card.active .sp-num-badge {
    background: var(--accent-dynamic);
    color: var(--text-on-accent);
}

.sp-thumb-number .sp-label {
    font-size: 0.62rem;
    color: var(--text-muted);
    opacity: 0.6;
}

/* ─── Footer Actions ─────────────────────────────────────── */
.slide-panel-footer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 10px 12px;
    border-top: 1px solid var(--border-glass);
    background: var(--bg-surface-solid);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    z-index: 5;
}

.sp-footer-btn {
    width: 34px;
    height: 34px;
    border-radius: 8px;
    background: var(--bg-item);
    border: 1px solid var(--border-glass);
    color: var(--text-muted);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    transition: all 0.2s;
}

.sp-footer-btn:hover {
    background: var(--bg-item-hover);
    color: var(--text-main);
    transform: scale(1.08);
    border-color: var(--border-strong);
}

.sp-footer-btn.danger:hover {
    color: var(--danger);
    border-color: rgba(231, 76, 60, 0.3);
    background: rgba(231, 76, 60, 0.1);
}

.sp-footer-btn.accent:hover {
    color: var(--accent-dynamic);
    border-color: rgba(249, 202, 36, 0.3);
    background: rgba(249, 202, 36, 0.08);
}

/* ─── Context Menu on Right-Click (slide-specific) ───────── */
.sp-context-menu {
    position: fixed;
    background: var(--bg-surface-solid);
    border: 1px solid var(--border-glass);
    border-radius: 8px;
    padding: 6px 0;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
    z-index: 200000;
    min-width: 160px;
    display: none;
    animation: spCtxFadeIn 0.15s ease-out;
}

.sp-context-menu.show {
    display: block;
}

@keyframes spCtxFadeIn {
    from {
        opacity: 0;
        transform: scale(0.95);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.sp-ctx-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 14px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-main);
    cursor: pointer;
    transition: background 0.15s;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
}

.sp-ctx-item:hover {
    background: var(--bg-item);
}

.sp-ctx-item i {
    width: 16px;
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.sp-ctx-item.danger {
    color: var(--danger);
}

.sp-ctx-item.danger i {
    color: var(--danger);
}

.sp-ctx-divider {
    height: 1px;
    background: var(--border-glass);
    margin: 4px 10px;
}

/* ─── Responsive ─────────────────────────────────────────── */
@media (max-width: 768px) {
    .slide-panel-sidebar {
        width: 180px;
    }

    .slide-panel-toggle {
        height: 60px;
        width: 24px;
    }
}

@media (max-width: 480px) {
    .slide-panel-sidebar {
        width: 160px;
    }
}

/* ─── Edge Buttons (floating on left edge of panel) ──────── */
/* Must allow overflow so buttons at left:-22px aren't clipped */
.slide-panel-sidebar {
    overflow: visible !important;
}

.slide-panel-sidebar .slide-panel-list {
    overflow-y: auto;
    overflow-x: hidden;
}

.sp-edge-btn {
    position: absolute;
    left: -22px;
    width: 44px;
    height: 44px;
    background: var(--bg-surface-solid);
    border: 2px solid var(--border-glass);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-muted);
    transition: all 0.3s cubic-bezier(0.19, 1, 0.22, 1);
    box-shadow: -2px 0 8px rgba(0, 0, 0, 0.15);
    opacity: 0;
    pointer-events: none;
    z-index: 10;
    font-size: 1rem;
}

.slide-panel-sidebar.open .sp-edge-btn {
    opacity: 1;
    pointer-events: auto;
}

/* Close arrow — centered vertically */
.sp-edge-close {
    top: 50%;
    transform: translateY(-50%);
}

.sp-edge-close:hover {
    transform: translateY(-50%) scale(1.1);
    background: var(--bg-item-hover);
    color: var(--accent-dynamic);
    border-color: var(--accent-dynamic);
    box-shadow: -4px 0 16px rgba(249, 202, 36, 0.2);
}

/* Expand button — positioned above the close arrow */
.sp-edge-expand {
    top: calc(50% - 56px);
    transform: translateY(-50%);
    font-size: 0.9rem;
}

.sp-edge-expand:hover {
    transform: translateY(-50%) scale(1.1);
    background: rgba(99, 102, 241, 0.15);
    color: #818cf8;
    border-color: #818cf8;
    box-shadow: -4px 0 16px rgba(99, 102, 241, 0.25);
}

/* Active state when expanded */
.sp-edge-expand.expanded {
    color: #818cf8;
    background: rgba(99, 102, 241, 0.12);
    border-color: #818cf8;
}

/* ─── Expanded Panel State (80% viewport width) ─────────── */
.slide-panel-sidebar.expanded {
    width: 80vw;
}

.slide-panel-sidebar.expanded .slide-panel-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 12px;
    align-content: start;
}

.slide-panel-sidebar.expanded .sp-thumb-card {
    width: 100%;
}

/* Footer stretches in expanded mode */
.slide-panel-sidebar.expanded .slide-panel-footer {
    justify-content: center;
    gap: 10px;
}

/* ─── Responsive — Expanded panel adjustments ────────────── */
@media (max-width: 768px) {
    .slide-panel-sidebar.expanded {
        width: 90vw;
    }

    .slide-panel-sidebar.expanded .slide-panel-list {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
}

@media (max-width: 480px) {
    .slide-panel-sidebar.expanded {
        width: 95vw;
    }

    .slide-panel-sidebar.expanded .slide-panel-list {
        grid-template-columns: 1fr 1fr;
    }
}