/* ==============================================================================
   PDF Viewer Modal Stylesheet
   Polished, responsive embedded PDF viewer with desktop and mobile support.
   ============================================================================== */

:root {
    --pdf-modal-primary: #1a365d;
    --pdf-modal-accent: #2563eb;
    --pdf-modal-accent-hover: #1d4ed8;
    --pdf-modal-border: #e2e8f0;
    --pdf-modal-text: #1e293b;
    --pdf-modal-muted: #64748b;
    --pdf-modal-bg: #ffffff;
    --pdf-modal-surface: #f8fafc;
}

/* Modal Overlay Wrapper */
.pdf-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    visibility: hidden;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease, visibility 0.25s ease;
}

.pdf-modal.active {
    visibility: visible;
    opacity: 1;
    pointer-events: auto;
}

/* Backdrop */
.pdf-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.72);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

/* Modal Dialog Box */
.pdf-modal-dialog {
    position: relative;
    width: 92%;
    max-width: 1100px;
    height: 90vh;
    background: var(--pdf-modal-bg);
    border-radius: 14px;
    box-shadow: 0 25px 50px -12px rgba(15, 23, 42, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    z-index: 1;
    transform: scale(0.96) translateY(8px);
    transition: transform 0.28s cubic-bezier(0.16, 1, 0.3, 1);
}

.pdf-modal.active .pdf-modal-dialog {
    transform: scale(1) translateY(0);
}

/* Modal Header */
.pdf-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.85rem 1.4rem;
    background: #ffffff;
    border-bottom: 1px solid var(--pdf-modal-border);
    flex-shrink: 0;
    gap: 1rem;
}

.pdf-modal-title-group {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    min-width: 0;
}

.pdf-modal-icon {
    font-size: 1.5rem;
    color: #ef4444; /* Clean PDF red accent */
    flex-shrink: 0;
}

.pdf-modal-title {
    font-size: 1.18rem;
    font-weight: 600;
    color: var(--pdf-modal-primary);
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    letter-spacing: -0.01em;
}

/* Header Actions */
.pdf-modal-actions {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-shrink: 0;
}

.pdf-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.45rem 0.95rem;
    border-radius: 8px;
    font-size: 0.88rem;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
    line-height: 1.4;
}

.pdf-btn-primary {
    background: var(--pdf-modal-accent);
    color: #ffffff !important;
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.2);
}

.pdf-btn-primary:hover {
    background: var(--pdf-modal-accent-hover);
    color: #ffffff !important;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(37, 99, 235, 0.28);
}

.pdf-btn-secondary {
    background: var(--pdf-modal-surface);
    color: var(--pdf-modal-text) !important;
    border: 1px solid var(--pdf-modal-border);
}

.pdf-btn-secondary:hover {
    background: #e2e8f0;
    color: #0f172a !important;
}

.pdf-modal-close {
    background: transparent;
    border: none;
    color: var(--pdf-modal-muted);
    font-size: 1.4rem;
    line-height: 1;
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.18s ease;
    padding: 0;
}

.pdf-modal-close:hover {
    background: #fee2e2;
    color: #dc2626;
}

/* Modal Body */
.pdf-modal-body {
    position: relative;
    flex: 1;
    background: #525659; /* Standard PDF viewer canvas dark */
    overflow: hidden;
    display: flex;
}

/* Iframe PDF Frame */
.pdf-modal-frame {
    width: 100%;
    height: 100%;
    border: none;
    background: #ffffff;
    display: block;
}

/* Loading State */
.pdf-modal-loading {
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.9rem;
    z-index: 5;
    color: var(--pdf-modal-primary);
}

.pdf-modal-loading p {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--pdf-modal-muted);
    margin: 0;
}

.pdf-spinner {
    width: 38px;
    height: 38px;
    border: 3px solid rgba(37, 99, 235, 0.15);
    border-top-color: var(--pdf-modal-accent);
    border-radius: 50%;
    animation: pdfSpin 0.75s linear infinite;
}

@keyframes pdfSpin {
    to { transform: rotate(360deg); }
}

/* Fallback Screen */
.pdf-modal-fallback {
    position: absolute;
    inset: 0;
    background: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    z-index: 6;
    text-align: center;
}

.pdf-fallback-content {
    max-width: 480px;
}

.pdf-fallback-content i {
    color: var(--pdf-modal-accent);
    font-size: 4rem;
    margin-bottom: 1rem;
    display: inline-block;
}

.pdf-fallback-content h4 {
    font-size: 1.3rem;
    color: var(--pdf-modal-primary);
    margin-bottom: 0.6rem;
}

.pdf-fallback-content p {
    color: var(--pdf-modal-muted);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.pdf-fallback-buttons {
    display: flex;
    gap: 0.8rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Body scroll lock */
body.pdf-modal-open {
    overflow: hidden !important;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .pdf-modal-dialog {
        width: 96%;
        height: 94vh;
        border-radius: 10px;
    }

    .pdf-modal-header {
        padding: 0.7rem 0.9rem;
    }

    .pdf-modal-title {
        font-size: 1.05rem;
    }

    .pdf-btn-text-optional {
        display: none;
    }

    .pdf-btn {
        padding: 0.4rem 0.65rem;
        font-size: 0.82rem;
    }
}