/* Premium PDF Viewer Stylesheet - Expert Partners */

:root {
    --ep-dark-bg: #0f172a;
    --ep-dark-card: rgba(30, 41, 59, 0.7);
    --ep-dark-panel: #1e293b;
    --ep-primary: #f6c63e;
    --ep-primary-hover: #e5b32f;
    --ep-text-main: #f8fafc;
    --ep-text-muted: #94a3b8;
    --ep-border: rgba(255, 255, 255, 0.1);
    --ep-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    --ep-accent-glow: rgba(246, 198, 62, 0.25);
}

/* Modal Overlay & Backdrop */
.ep-pdf-viewer-modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 1050;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.ep-pdf-viewer-modal.active {
    display: flex;
    opacity: 1;
}

.ep-pdf-viewer-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(8px);
    z-index: 0;
}

/* Main Dialog Container */
.ep-pdf-viewer-dialog {
    position: relative;
    width: min(96vw, 1500px);
    height: min(94vh, 1000px);
    background: var(--ep-dark-bg);
    border: 1px solid var(--ep-border);
    border-radius: 12px;
    box-shadow: var(--ep-shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    z-index: 1;
    transform: scale(0.97);
    transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.ep-pdf-viewer-modal.active .ep-pdf-viewer-dialog {
    transform: scale(1);
}

/* Sticky Header */
.ep-pdf-header {
    background: #0f172a;
    border-bottom: 1px solid var(--ep-border);
    padding: 15px 25px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
    z-index: 2;
}

.ep-pdf-title-block {
    display: flex;
    align-items: center;
    gap: 12px;
    max-width: 60%;
}

.ep-pdf-title-block h3 {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--ep-text-main);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.ep-pdf-badge {
    background: #ef4444;
    color: #fff;
    font-size: 0.7rem;
    font-weight: 800;
    padding: 3px 7px;
    border-radius: 4px;
    text-transform: uppercase;
}

.ep-pdf-size {
    font-size: 0.8rem;
    color: var(--ep-text-muted);
}

.ep-pdf-header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Progress Indicator Line */
.ep-pdf-progress-track {
    width: 100%;
    height: 3px;
    background: rgba(255, 255, 255, 0.05);
    position: relative;
    z-index: 2;
    flex-shrink: 0;
}

.ep-pdf-progress-bar {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0%;
    background: var(--ep-primary);
    box-shadow: 0 0 8px var(--ep-primary);
    transition: width 0.15s ease;
}

/* Main Split Workspace */
.ep-pdf-workspace {
    flex: 1;
    display: flex;
    overflow: hidden;
    position: relative;
    background: #090d16;
}

/* Thumbnail Sidebar */
.ep-pdf-sidebar {
    width: 250px;
    background: #0f172a;
    border-right: 1px solid var(--ep-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), margin-left 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 1;
    flex-shrink: 0;
}

.ep-pdf-sidebar.collapsed {
    margin-left: -250px;
}

.ep-pdf-sidebar-title {
    padding: 12px 20px;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--ep-text-muted);
    border-bottom: 1px solid var(--ep-border);
    font-weight: 700;
}

.ep-pdf-thumbnails-container {
    flex: 1;
    overflow-y: auto;
    padding: 15px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

/* Thumbnail Items */
.ep-pdf-thumb-item {
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

.ep-pdf-thumb-wrapper {
    width: 150px;
    background: #fff;
    border: 2px solid transparent;
    border-radius: 4px;
    overflow: hidden;
    box-shadow: 0 4px 10px rgba(0,0,0,0.3);
    transition: border-color 0.2s, transform 0.2s;
    position: relative;
    aspect-ratio: 1 / 1.414; /* Standard A4 aspect ratio */
}

.ep-pdf-thumb-item:hover .ep-pdf-thumb-wrapper {
    transform: translateY(-2px);
    border-color: rgba(246, 198, 62, 0.5);
}

.ep-pdf-thumb-item.active .ep-pdf-thumb-wrapper {
    border-color: var(--ep-primary);
    box-shadow: 0 0 12px var(--ep-accent-glow);
}

.ep-pdf-thumb-wrapper canvas {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.ep-pdf-thumb-number {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--ep-text-muted);
    transition: color 0.2s;
}

.ep-pdf-thumb-item.active .ep-pdf-thumb-number {
    color: var(--ep-primary);
}

/* Page Rendering Workspace */
.ep-pdf-viewarea {
    flex: 1;
    overflow: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px;
    position: relative;
    outline: none;
}

.ep-pdf-canvas-wrapper {
    background: #fff;
    box-shadow: 0 10px 30px rgba(0,0,0,0.7);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
    opacity: 0;
    transition: opacity 0.15s ease;
}

.ep-pdf-canvas-wrapper.loaded {
    opacity: 1;
}

.ep-pdf-canvas-wrapper canvas {
    display: block;
    max-width: 100%;
    height: auto;
}

/* Sticky Controls Footer */
.ep-pdf-controls {
    background: #0f172a;
    border-top: 1px solid var(--ep-border);
    padding: 12px 25px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 15px;
    z-index: 2;
    flex-shrink: 0;
}

.ep-pdf-control-group {
    display: flex;
    align-items: center;
    gap: 10px;
}

.ep-pdf-zoom-percent {
    min-width: 50px;
    text-align: center;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--ep-text-main);
}

.ep-pdf-divider {
    height: 20px;
    width: 1px;
    background: var(--ep-border);
    margin: 0 5px;
}

.ep-pdf-page-indicator {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--ep-text-main);
    display: flex;
    align-items: center;
    gap: 8px;
}

.ep-pdf-page-input {
    width: 45px;
    padding: 4px 6px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--ep-border);
    color: #fff;
    border-radius: 4px;
    text-align: center;
    font-weight: 700;
    font-family: inherit;
    font-size: 0.85rem;
}

.ep-pdf-page-input:focus {
    outline: none;
    border-color: var(--ep-primary);
    box-shadow: 0 0 5px var(--ep-accent-glow);
}

/* Buttons Styling */
.ep-pdf-btn {
    background: transparent;
    border: 1px solid var(--ep-border);
    color: var(--ep-text-muted);
    padding: 8px 14px;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.85rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
    user-select: none;
}

.ep-pdf-btn:hover {
    color: var(--ep-text-main);
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--ep-text-muted);
}

.ep-pdf-btn-primary {
    background: var(--ep-primary);
    border-color: var(--ep-primary);
    color: #0f172a;
}

.ep-pdf-btn-primary:hover {
    background: var(--ep-primary-hover);
    border-color: var(--ep-primary-hover);
    color: #0f172a;
    box-shadow: 0 0 10px var(--ep-accent-glow);
}

.ep-pdf-btn-danger {
    color: #f87171;
    border-color: rgba(239, 68, 68, 0.2);
}

.ep-pdf-btn-danger:hover {
    background: rgba(239, 68, 68, 0.1);
    border-color: #f87171;
    color: #fff;
}

.ep-pdf-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background: transparent !important;
    border-color: var(--ep-border) !important;
    color: var(--ep-text-muted) !important;
    box-shadow: none !important;
}

/* Loading & Error States */
.ep-pdf-loader,
.ep-pdf-error {
    position: absolute;
    inset: 0;
    background: #090d16;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 15px;
    z-index: 5;
    padding: 20px;
    text-align: center;
}

.ep-pdf-spinner {
    color: var(--ep-primary);
    font-size: 2.5rem;
    animation: ep-spin 1s linear infinite;
}

.ep-pdf-loader-text {
    font-size: 1rem;
    font-weight: 600;
    color: var(--ep-text-main);
}

.ep-pdf-loader-progress {
    font-size: 0.85rem;
    color: var(--ep-primary);
    font-weight: 700;
    margin-top: -5px;
}

.ep-pdf-error i {
    color: #f87171;
    font-size: 3rem;
}

.ep-pdf-error-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--ep-text-main);
}

.ep-pdf-error-msg {
    font-size: 0.9rem;
    color: var(--ep-text-muted);
    max-width: 400px;
}

/* Touch Device Swipe Indicator / Hints */
@keyframes ep-spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Responsive Overrides */
@media (max-width: 768px) {
    .ep-pdf-header {
        padding: 12px 15px;
    }
    .ep-pdf-title-block h3 {
        font-size: 0.95rem;
    }
    .ep-pdf-size {
        display: none;
    }
    .ep-pdf-controls {
        padding: 10px 15px;
        justify-content: center;
    }
    .ep-pdf-control-group {
        width: 100%;
        justify-content: center;
    }
    .ep-pdf-sidebar {
        position: absolute;
        left: 0;
        top: 0;
        bottom: 0;
        box-shadow: 10px 0 20px rgba(0,0,0,0.5);
    }
}