/**
 * Campus Modern PDF Viewer Stylesheet
 * Path: css/campus-pdf-viewer.css
 * Mobile-first, Touch-friendly, High-DPI Responsive, Glassmorphism-compatible
 */

.cmc-pdf-viewer-shell {
    position: relative;
    width: 100%;
    display: flex;
    flex-direction: column;
    background: var(--glass-bg-nested, rgba(15, 23, 42, 0.04));
    border-radius: 12px;
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
    min-height: 520px;
}

[data-theme="dark"] .cmc-pdf-viewer-shell {
    background: rgba(0, 0, 0, 0.25);
}

/* Sticky Liquid Glass Toolbar */
.cmc-pdf-toolbar {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    background: var(--glass-card-bg, rgba(255, 255, 255, 0.85));
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--glass-card-border, rgba(0, 0, 0, 0.08));
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
}

[data-theme="dark"] .cmc-pdf-toolbar {
    background: rgba(18, 24, 38, 0.88);
    border-bottom-color: rgba(255, 255, 255, 0.08);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.cmc-pdf-toolbar-group {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    background: rgba(0, 0, 0, 0.04);
    padding: 2px 4px;
    border-radius: 8px;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .cmc-pdf-toolbar-group {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.08);
}

/* Touch-friendly buttons (minimum 36px-40px on mobile) */
.cmc-pdf-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 34px;
    height: 34px;
    padding: 0 6px;
    border: 0;
    background: transparent;
    color: var(--bs-body-color, #334155);
    border-radius: 6px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background-color 0.15s ease, color 0.15s ease, transform 0.1s ease;
    text-decoration: none;
    line-height: 1;
}

[data-theme="dark"] .cmc-pdf-btn {
    color: #e2e8f0;
}

.cmc-pdf-btn:hover:not(:disabled) {
    background: rgba(0, 0, 0, 0.08);
    color: var(--bs-primary, #0d6efd);
}

[data-theme="dark"] .cmc-pdf-btn:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.12);
    color: #60a5fa;
}

.cmc-pdf-btn:active:not(:disabled) {
    transform: scale(0.95);
}

.cmc-pdf-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
}

.cmc-pdf-btn.btn-primary-highlight {
    background: var(--bs-primary, #0d6efd);
    color: #fff !important;
}

.cmc-pdf-btn.btn-primary-highlight:hover {
    background: #0b5ed7;
}

/* Page Indicator & Input */
.cmc-pdf-page-display {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.85rem;
    font-weight: 500;
    padding: 0 4px;
    color: var(--bs-body-color, #334155);
}

[data-theme="dark"] .cmc-pdf-page-display {
    color: #cbd5e1;
}

.cmc-pdf-page-input {
    width: 44px;
    height: 28px;
    padding: 0 4px;
    text-align: center;
    font-size: 0.85rem;
    font-weight: 600;
    border: 1px solid rgba(0, 0, 0, 0.15);
    border-radius: 4px;
    background: var(--bs-body-bg, #fff);
    color: inherit;
    -moz-appearance: textfield;
}

.cmc-pdf-page-input::-webkit-outer-spin-button,
.cmc-pdf-page-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

[data-theme="dark"] .cmc-pdf-page-input {
    border-color: rgba(255, 255, 255, 0.15);
    background: rgba(0, 0, 0, 0.4);
}

.cmc-pdf-zoom-val {
    min-width: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    font-family: inherit;
}

/* Scrollable Viewport */
.cmc-pdf-viewport {
    position: relative;
    width: 100%;
    flex: 1 1 auto;
    min-height: 58vh;
    max-height: 82vh;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-x pan-y pinch-zoom;
    padding: 1rem 0.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    background: rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .cmc-pdf-viewport {
    background: rgba(0, 0, 0, 0.4);
}

/* Pages Container */
.cmc-pdf-pages-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    width: 100%;
    max-width: 100%;
    transform-origin: top center;
    transition: transform 0.1s ease-out;
}

/* Individual Page Wrapper */
.cmc-pdf-page-card {
    position: relative;
    background: #ffffff;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12), 0 1px 3px rgba(0, 0, 0, 0.08);
    border-radius: 4px;
    overflow: hidden;
    margin: 0 auto;
    max-width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

[data-theme="dark"] .cmc-pdf-page-card {
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.cmc-pdf-page-card canvas {
    display: block;
    max-width: 100%;
    height: auto;
}

/* Page Skeleton / Loader */
.cmc-pdf-page-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: 400px;
    width: 100%;
    color: #64748b;
    font-size: 0.85rem;
}

/* Global Loading State */
.cmc-pdf-loading-overlay {
    position: absolute;
    inset: 0;
    z-index: 30;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--glass-card-bg, rgba(255, 255, 255, 0.92));
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    gap: 0.75rem;
    color: var(--bs-body-color, #1e293b);
}

[data-theme="dark"] .cmc-pdf-loading-overlay {
    background: rgba(15, 23, 42, 0.92);
    color: #f1f5f9;
}

/* Global Error State */
.cmc-pdf-error-overlay {
    position: absolute;
    inset: 0;
    z-index: 30;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    text-align: center;
    background: var(--glass-card-bg, rgba(255, 255, 255, 0.95));
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

[data-theme="dark"] .cmc-pdf-error-overlay {
    background: rgba(15, 23, 42, 0.95);
}

/* Mobile Toolbar Responsiveness */
@media (max-width: 576px) {
    .cmc-pdf-toolbar {
        padding: 0.4rem 0.5rem;
        gap: 0.35rem;
    }
    
    .cmc-pdf-toolbar-group {
        gap: 2px;
        padding: 2px;
    }

    .cmc-pdf-btn {
        min-width: 32px;
        height: 32px;
        font-size: 0.85rem;
        padding: 0 4px;
    }

    .cmc-pdf-page-display {
        font-size: 0.8rem;
    }

    .cmc-pdf-page-input {
        width: 38px;
        height: 26px;
        font-size: 0.8rem;
    }

    .cmc-pdf-zoom-val {
        min-width: 44px;
        font-size: 0.75rem;
    }

    .cmc-pdf-viewport {
        padding: 0.5rem 0.25rem;
        min-height: 64vh;
    }

    .cmc-pdf-page-card {
        border-radius: 2px;
    }
}