/**
 * UMBC PDF Viewer Styles
 * WCAG 2.1 AA Compliant
 */

/* Screen reader only class */
.sr-only {
    position: absolute !important;
    height: 1px !important;
    width: 1px !important;
    overflow: hidden !important;
    clip: rect(1px 1px 1px 1px) !important;
    clip: rect(1px, 1px, 1px, 1px) !important;
    white-space: nowrap !important;
}

/* Skip link for keyboard users */
.umbc-pdf-skip-link {
    position: absolute !important;
    top: -100px !important;
    left: 0 !important;
    background: #1C74BC !important;
    color: white !important;
    padding: 8px 16px !important;
    text-decoration: none !important;
    font-weight: 600 !important;
    z-index: 100 !important;
    border-radius: 0 0 4px 0 !important;
    opacity: 0 !important;
}

.umbc-pdf-skip-link:focus {
    top: 0 !important;
    opacity: 1 !important;
    outline: 3px solid #fdb515 !important;
    outline-offset: 2px !important;
}

/* ============================================================
   Container
   ============================================================ */
.umbc-pdf-viewer-container {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif !important;
    background: #f5f5f5 !important;
    border: 2px solid #666 !important;
    border-radius: 4px !important;
    overflow: hidden !important;
    margin: 1rem 0 !important;
    position: relative !important;
    box-sizing: border-box !important;
}

.umbc-pdf-viewer-container:focus {
    outline: 3px solid #1C74BC !important;
    outline-offset: 2px !important;
}

/* ============================================================
   Loading State
   ============================================================ */
.umbc-pdf-loading {
    display: flex;
    flex-direction: column !important;
    align-items: center !important;
    justify-content: center !important;
    padding: 4rem 2rem !important;
    text-align: center !important;
}

.umbc-pdf-loading.is-hidden {
    display: none !important;
}

.umbc-pdf-loading p {
    font-size: 1rem !important;
    color: #333 !important;
}

.umbc-pdf-spinner {
    border: 4px solid #f3f3f3 !important;
    border-top: 4px solid #fdb515 !important;
    border-radius: 50% !important;
    width: 40px !important;
    height: 40px !important;
    margin-bottom: 1rem !important;
}

@media (prefers-reduced-motion: no-preference) {
    .umbc-pdf-spinner {
        animation: umbc-spin 1s linear infinite !important;
    }
}

@keyframes umbc-spin {
    0%   { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ============================================================
   Controls Toolbar
   ============================================================ */
.umbc-pdf-controls {
    display: flex !important;
    flex-wrap: wrap !important;
    gap: 0.25rem !important;
    padding: 0.5rem !important;
    background: #fff !important;
    border-bottom: 1px solid #ddd !important;
    align-items: center !important;
    justify-content: space-between !important;
    box-sizing: border-box !important;
    width: 100% !important;
}

@media (prefers-reduced-motion: no-preference) {
    .umbc-pdf-controls[style*="display: flex"] {
        animation: fadeInControls 400ms ease-out;
    }

    @keyframes fadeInControls {
        0%   { opacity: 0; transform: translateY(-10px); }
        100% { opacity: 1; transform: translateY(0); }
    }
}

.umbc-pdf-nav-controls,
.umbc-pdf-zoom-controls,
.umbc-pdf-secondary-controls {
    display: flex !important;
    gap: 0.25rem !important;
    align-items: center !important;
}

/* ============================================================
   Buttons — hardened with !important against theme overrides
   ============================================================ */
.umbc-pdf-btn {
    background: #fff !important;
    border: 2px solid #666 !important;
    border-radius: 4px !important;
    padding: 0.375rem 0.625rem !important;
    font-size: 0.9rem !important;
    font-weight: 500 !important;
    color: #000 !important;
    cursor: pointer !important;
    min-width: 44px !important;
    min-height: 44px !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 0.25rem !important;
    text-decoration: none !important;
    line-height: 1 !important;
    box-shadow: none !important;
    letter-spacing: normal !important;
    text-transform: none !important;
    font-family: inherit !important;
    margin: 0 !important;
    vertical-align: middle !important;
    box-sizing: border-box !important;
}

@media (prefers-reduced-motion: no-preference) {
    .umbc-pdf-btn {
        transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease !important;
    }
}

.umbc-pdf-btn:hover:not(:disabled) {
    background: #f0f0f0 !important;
    border-color: #000 !important;
    color: #000 !important;
    text-decoration: none !important;
}

.umbc-pdf-btn:focus {
    outline: 3px solid #1C74BC !important;
    outline-offset: 2px !important;
    z-index: 1 !important;
}

.umbc-pdf-btn:focus-visible {
    outline: 3px solid #1C74BC !important;
    outline-offset: 2px !important;
    box-shadow: 0 0 0 5px rgba(28, 116, 188, 0.2) !important;
}

.umbc-pdf-btn:focus:not(:focus-visible) {
    outline: none !important;
    box-shadow: none !important;
}

@media (prefers-reduced-motion: no-preference) {
    .umbc-pdf-btn:active:not(:disabled) {
        transform: translateY(1px) !important;
    }
}

.umbc-pdf-btn:disabled {
    cursor: not-allowed !important;
    background: #e0e0e0 !important;
    color: #595959 !important;
    border-color: #999 !important;
    box-shadow: none !important;
}

/* Hide button text on small screens, show on larger */
.umbc-btn-text {
    display: none !important;
}

@media (min-width: 640px) {
    .umbc-btn-text {
        display: inline !important;
    }
}

/* ============================================================
   Page Info
   ============================================================ */
.umbc-pdf-page-info {
    display: flex !important;
    align-items: center !important;
    gap: 0.5rem !important;
    font-size: 1rem !important;
    color: #000 !important;
}

.umbc-page-label {
    font-weight: 500 !important;
    margin-right: 0.25rem !important;
    color: #000 !important;
    font-family: inherit !important;
}

.umbc-pdf-page-input {
    width: 70px !important;
    min-height: 44px !important;
    padding: 0.5rem !important;
    border: 2px solid #666 !important;
    border-radius: 4px !important;
    text-align: center !important;
    font-size: 1rem !important;
    color: #000 !important;
    background: #fff !important;
    box-sizing: border-box !important;
    font-family: inherit !important;
    box-shadow: none !important;
}

.umbc-pdf-page-input:focus {
    outline: 3px solid #1C74BC !important;
    outline-offset: 2px !important;
    border-color: #1C74BC !important;
}

.umbc-pdf-page-input:focus-visible {
    outline: 3px solid #1C74BC !important;
    outline-offset: 2px !important;
    box-shadow: 0 0 0 5px rgba(28, 116, 188, 0.2) !important;
}

.umbc-pdf-page-count {
    white-space: nowrap !important;
    font-weight: 500 !important;
    color: #000 !important;
}

/* ============================================================
   Zoom Level Display
   ============================================================ */
.umbc-pdf-zoom-level {
    min-width: 60px !important;
    text-align: center !important;
    font-size: 1rem !important;
    font-weight: 600 !important;
    color: #000 !important;
    padding: 0.5rem !important;
}

/* ============================================================
   Canvas Wrapper
   ============================================================ */
.umbc-pdf-canvas-wrapper {
    position: relative !important;
    overflow: auto !important;
    background: #525252 !important;
    display: flex !important;
    align-items: flex-start !important;
    justify-content: center !important;
    padding: 1rem !important;
    box-sizing: border-box !important;
}

/* On mobile, cap height to avoid overflowing the viewport.
   Controls take ~52px; leave a little breathing room. */
@media (max-width: 768px) {
    .umbc-pdf-canvas-wrapper {
        max-height: calc(100svh - 120px) !important;
        padding: 0.25rem !important;
    }
}

/* ============================================================
   Canvas
   ============================================================ */
.umbc-pdf-canvas {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3) !important;
    background: white !important;
    display: block !important;
    opacity: 1 !important;
    transform: scale(1) !important;
    max-width: 100% !important;
}

/* ============================================================
   Page Transition Animations
   ============================================================ */
@media (prefers-reduced-motion: no-preference) {
    .umbc-pdf-canvas {
        transition: opacity 300ms ease-out, transform 300ms ease-out;
    }

    .umbc-pdf-canvas.page-transitioning-out {
        opacity: 0 !important;
        transform: scale(0.95) !important;
    }

    .umbc-pdf-canvas.page-transitioning-in {
        animation: pageTransitionIn 300ms ease-out forwards;
    }

    @keyframes pageTransitionIn {
        0%   { opacity: 0; transform: scale(0.95); }
        100% { opacity: 1; transform: scale(1); }
    }

    .umbc-pdf-canvas.zoom-transitioning {
        animation: zoomTransition 250ms ease-out;
    }

    @keyframes zoomTransition {
        0%   { opacity: 0.8; transform: scale(0.98); }
        100% { opacity: 1;   transform: scale(1); }
    }
}

@media (prefers-reduced-motion: reduce) {
    .umbc-pdf-canvas {
        transition: none !important;
        animation: none !important;
    }

    .umbc-pdf-canvas.page-transitioning-out,
    .umbc-pdf-canvas.page-transitioning-in,
    .umbc-pdf-canvas.zoom-transitioning {
        opacity: 1 !important;
        transform: scale(1) !important;
    }
}

/* ============================================================
   Text Layer
   ============================================================ */
.umbc-pdf-text-layer {
    position: absolute !important;
    left: 0 !important;
    top: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    overflow: hidden !important;
    opacity: 0.2 !important;
    line-height: 1.0 !important;
}

/* ============================================================
   Annotation Layer
   ============================================================ */
.umbc-pdf-annotation-layer {
    position: absolute !important;
    left: 0 !important;
    top: 0 !important;
    overflow: visible !important;
    pointer-events: none !important;
    z-index: 10 !important;
}

.umbc-pdf-annotation-layer a {
    position: absolute !important;
    cursor: pointer !important;
    pointer-events: auto !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    text-decoration: none !important;
    background: rgba(28, 116, 188, 0.1) !important;
    border: 2px solid transparent !important;
    transition: all 0.2s ease !important;
}

.umbc-pdf-annotation-layer a::after {
    content: '↗';
    font-size: 16px !important;
    color: #1C74BC !important;
    display: none !important;
}

.umbc-pdf-annotation-layer a:hover {
    background: #ffffff !important;
    border-color: #1C74BC !important;
    border-radius: 0 !important;
}

.umbc-pdf-annotation-layer a:hover::after {
    display: block !important;
}

.umbc-pdf-annotation-layer a:focus {
    outline: 3px solid #1C74BC !important;
    outline-offset: 2px !important;
    background: #ffffff !important;
    border-color: #1C74BC !important;
    border-radius: 4px !important;
    z-index: 20 !important;
}

.umbc-pdf-annotation-layer a:focus::after {
    display: block !important;
}

/* ============================================================
   Mobile Responsive Controls
   ============================================================ */
@media (max-width: 768px) {
    .umbc-pdf-controls {
        flex-direction: column !important;
        gap: 0.4rem !important;
        padding: 0.4rem !important;
    }

    .umbc-pdf-nav-controls,
    .umbc-pdf-zoom-controls,
    .umbc-pdf-secondary-controls {
        width: 100% !important;
        justify-content: center !important;
    }

    /* Compact buttons on mobile */
    .umbc-pdf-btn {
        min-width: 40px !important;
        min-height: 40px !important;
        padding: 0.3rem 0.5rem !important;
        font-size: 0.85rem !important;
    }
}

/* ============================================================
   High Contrast Mode
   ============================================================ */
@media (prefers-contrast: high) {
    .umbc-pdf-btn {
        border-width: 3px !important;
    }

    .umbc-pdf-btn:focus {
        outline-width: 4px !important;
    }
}

/* ============================================================
   Download Button — UMBC Gold
   ============================================================ */
.umbc-pdf-download {
    background: #fdb515 !important;
    border-color: #c88a00 !important;
    color: #000 !important;
    font-weight: 700 !important;
}

.umbc-pdf-download:hover:not(:disabled) {
    background: #e5a314 !important;
    border-color: #b07800 !important;
    color: #000 !important;
}

.umbc-pdf-download:focus,
.umbc-pdf-download:focus-visible {
    background: #1C74BC !important;
    border-color: #1C74BC !important;
    color: white !important;
    outline: 3px solid #fdb515 !important;
    outline-offset: 2px !important;
}

/* ============================================================
   Zoom Controls — always visible
   ============================================================ */
.umbc-pdf-zoom-controls {
    display: flex !important;
}

/* ============================================================
   Native Fullscreen Mode
   ============================================================ */
.umbc-pdf-viewer-container:fullscreen,
.umbc-pdf-viewer-container:-webkit-full-screen,
.umbc-pdf-viewer-container:-moz-full-screen,
.umbc-pdf-viewer-container:-ms-fullscreen {
    background: #525252 !important;
    width: 100vw !important;
    height: 100vh !important;
    max-width: 100vw !important;
    border: none !important;
    border-radius: 0 !important;
}

.umbc-pdf-viewer-container:fullscreen .umbc-pdf-canvas-wrapper,
.umbc-pdf-viewer-container:-webkit-full-screen .umbc-pdf-canvas-wrapper,
.umbc-pdf-viewer-container:-moz-full-screen .umbc-pdf-canvas-wrapper,
.umbc-pdf-viewer-container:-ms-fullscreen .umbc-pdf-canvas-wrapper {
    height: calc(100vh - 60px) !important;
    max-height: none !important;
}

/* ============================================================
   Fake Fullscreen (mobile / iOS fallback via position:fixed)
   ============================================================ */
.umbc-pdf-viewer-container.is-fake-fullscreen {
    position: fixed !important;
    inset: 0 !important;
    width: 100vw !important;
    height: 100dvh !important; /* dvh = device viewport height, accounts for mobile browser chrome */
    max-width: 100vw !important;
    z-index: 99999 !important;
    border: none !important;
    border-radius: 0 !important;
    margin: 0 !important;
    background: #525252 !important;
    display: flex !important;
    flex-direction: column !important;
    overflow: hidden !important;
}

/* Prevent body scroll when fake fullscreen is active */
body.umbc-pdf-body-fullscreen {
    overflow: hidden !important;
}

.umbc-pdf-viewer-container.is-fake-fullscreen .umbc-pdf-canvas-wrapper {
    flex: 1 1 auto !important;
    height: auto !important;
    max-height: none !important;
    min-height: 0 !important;
}

/* is-fullscreen (shared class for both native and fake) */
.umbc-pdf-viewer-container.is-fullscreen .umbc-pdf-canvas-wrapper {
    height: calc(100vh - 60px) !important;
    max-height: none !important;
}

/* Override the above with flex for fake fullscreen */
.umbc-pdf-viewer-container.is-fake-fullscreen .umbc-pdf-canvas-wrapper {
    height: auto !important;
}

/* ============================================================
   Spread Mode
   ============================================================ */
.umbc-pdf-viewer-container[data-spread-mode="true"] .umbc-pdf-canvas-wrapper {
    display: flex !important;
    gap: 1rem !important;
    justify-content: center !important;
    align-items: flex-start !important;
}

.umbc-pdf-viewer-container[data-spread-mode="true"] .umbc-pdf-canvas-left,
.umbc-pdf-viewer-container[data-spread-mode="true"] .umbc-pdf-canvas-right {
    flex: 0 0 auto !important;
    max-width: 48% !important;
}

.umbc-pdf-viewer-container[data-spread-mode="false"] .umbc-pdf-canvas-wrapper {
    justify-content: center !important;
}

/* ============================================================
   Error Messages
   ============================================================ */
.umbc-pdf-error-container {
    padding: 1rem !important;
    background: #fff3cd !important;
    border: 2px solid #856404 !important;
    border-radius: 4px !important;
    color: #856404 !important;
    font-weight: 600 !important;
}

.umbc-pdf-error {
    color: #721c24 !important;
    background: #f8d7da !important;
    border: 2px solid #721c24 !important;
    padding: 1rem !important;
    border-radius: 4px !important;
    font-weight: 600 !important;
}

/* ============================================================
   Reduced Motion — global override
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
    .umbc-pdf-viewer-container *,
    .umbc-pdf-viewer-container *::before,
    .umbc-pdf-viewer-container *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .umbc-pdf-spinner {
        animation: none !important;
        border-top-color: transparent !important;
    }
}

/* ============================================================
   Print
   ============================================================ */
@media print {
    .umbc-pdf-controls,
    .umbc-pdf-loading,
    .umbc-pdf-skip-link {
        display: none !important;
    }

    .umbc-pdf-viewer-container {
        border: none !important;
        margin: 0 !important;
        background: transparent !important;
    }

    .umbc-pdf-canvas-wrapper {
        height: auto !important;
        max-height: none !important;
        overflow: visible !important;
        padding: 0 !important;
        background: transparent !important;
    }

    .umbc-pdf-canvas {
        box-shadow: none !important;
    }
}