.envelope-viewer-layout {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
    background: linear-gradient(135deg, #1e3c72 0%, #2a5298 50%, #7e22ce 100%);
}

.envelope-action-bar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 3px solid rgba(126, 34, 206, 0.3);
    padding: 1.25rem 2rem;
    flex-shrink: 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

.envelope-action-bar__inner {
    max-width: 1600px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 2rem;
}

.envelope-logo svg {
    filter: drop-shadow(0 2px 4px rgba(126, 34, 206, 0.3));
    color: #7e22ce;
}

.envelope-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: #1e293b;
    letter-spacing: -0.025em;
}

.envelope-key {
    font-size: 0.8125rem;
    color: #64748b;
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    font-weight: 500;
    margin-top: 0.25rem;
}

.envelope-content {
    flex: 1;
    min-height: 0;
    padding: 1.5rem;
    position: relative;
    overflow: auto;
}

.pdf-viewer-container {
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.pdf-thumbnails {
    position: relative;
    width: 260px;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border-radius: 16px 0 0 16px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.12),
        0 0 0 1px rgba(126, 34, 206, 0.1);
    border: 1px solid rgba(126, 34, 206, 0.15);
    border-right: none;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    flex-shrink: 0;
}

.pdf-thumbnails__content {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.pdf-thumbnails__content::-webkit-scrollbar {
    width: 6px;
}

.pdf-thumbnails__content::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.05);
    border-radius: 3px;
}

.pdf-thumbnails__content::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #7e22ce 0%, #2a5298 100%);
    border-radius: 3px;
}

.pdf-thumbnails__content::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #6b1cb0 0%, #1e3a72 100%);
}

.pdf-splitter {
    width: 4px;
    background: transparent;
    cursor: col-resize;
    flex-shrink: 0;
    position: relative;
    transition: background 0.2s ease;
    z-index: 10;
    user-select: none;
}

.pdf-splitter::before {
    content: '';
    position: absolute;
    left: -4px;
    right: -4px;
    top: 0;
    bottom: 0;
    /* Enlarged hitbox for easier grabbing */
}

.pdf-splitter:hover,
.pdf-splitter.resizing {
    background: linear-gradient(90deg, 
        rgba(126, 34, 206, 0.4) 0%, 
        rgba(42, 82, 152, 0.4) 100%);
}

.pdf-splitter:active {
    background: linear-gradient(90deg, 
        rgba(126, 34, 206, 0.6) 0%, 
        rgba(42, 82, 152, 0.6) 100%);
}

/* Prevent text selection during resize */
body.resizing {
    user-select: none;
    cursor: col-resize !important;
}

.pdf-thumbnail {
    cursor: pointer;
    border-radius: 8px;
    overflow: hidden;
    background: white;
    border: 2px solid transparent;
    transition: all 0.2s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.pdf-thumbnail:hover {
    border-color: rgba(126, 34, 206, 0.3);
    box-shadow: 0 4px 16px rgba(126, 34, 206, 0.2);
    transform: translateY(-2px);
}

.pdf-thumbnail--active {
    border-color: #7e22ce;
    box-shadow: 
        0 4px 16px rgba(126, 34, 206, 0.3),
        0 0 0 3px rgba(126, 34, 206, 0.1);
}

.pdf-thumbnail__preview {
    width: 100%;
    aspect-ratio: 210 / 297;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.pdf-thumbnail__canvas {
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
}

.pdf-thumbnail__label {
    padding: 0.5rem;
    text-align: center;
    font-size: 0.75rem;
    font-weight: 600;
    color: #64748b;
    background: rgba(126, 34, 206, 0.03);
    border-top: 1px solid rgba(126, 34, 206, 0.1);
}

.pdf-thumbnail--active .pdf-thumbnail__label {
    background: linear-gradient(135deg, rgba(126, 34, 206, 0.1) 0%, rgba(42, 82, 152, 0.1) 100%);
    color: #7e22ce;
    font-weight: 700;
}

.pdf-toolbar__btn--toggle {
    background: linear-gradient(135deg, rgba(126, 34, 206, 0.08) 0%, rgba(42, 82, 152, 0.08) 100%);
    border-color: rgba(126, 34, 206, 0.25);
}

.pdf-toolbar__btn--toggle:hover:not(:disabled) {
    background: linear-gradient(135deg, rgba(126, 34, 206, 0.15) 0%, rgba(42, 82, 152, 0.15) 100%);
    border-color: rgba(126, 34, 206, 0.5);
}

.pdf-toolbar {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border-radius: 12px;
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    box-shadow: 
        0 4px 16px rgba(0, 0, 0, 0.1),
        0 0 0 1px rgba(126, 34, 206, 0.1);
    border: 1px solid rgba(126, 34, 206, 0.15);
    flex-shrink: 0;
    width: 95%;
}

.pdf-toolbar__section {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.pdf-toolbar__zoom-section {
    gap: 0.75rem;
    flex: 1;
    max-width: 400px;
    min-width: 280px;
    justify-content: center;
}

.pdf-toolbar__divider {
    width: 1px;
    height: 32px;
    background: linear-gradient(180deg, transparent 0%, rgba(126, 34, 206, 0.2) 50%, transparent 100%);
}

.pdf-toolbar__btn {
    background: linear-gradient(135deg, rgba(126, 34, 206, 0.05) 0%, rgba(42, 82, 152, 0.05) 100%);
    border: 1px solid rgba(126, 34, 206, 0.2);
    border-radius: 8px;
    padding: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #1e293b;
    min-width: 34px;
    min-height: 34px;
}

.pdf-toolbar__btn:hover:not(:disabled) {
    background: linear-gradient(135deg, rgba(126, 34, 206, 0.1) 0%, rgba(42, 82, 152, 0.1) 100%);
    border-color: rgba(126, 34, 206, 0.4);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(126, 34, 206, 0.2);
}

.pdf-toolbar__btn:active:not(:disabled) {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(126, 34, 206, 0.15);
}

.pdf-toolbar__btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background: rgba(0, 0, 0, 0.02);
    border-color: rgba(0, 0, 0, 0.1);
}

.pdf-toolbar__btn--preset {
    padding: 0.5rem 0.875rem;
    font-size: 0.813rem;
    font-weight: 600;
    color: #475569;
    min-width: auto;
    white-space: nowrap;
}

.pdf-toolbar__btn--preset svg {
    flex-shrink: 0;
}

.pdf-toolbar__page-input-group {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    background: white;
    border: 1px solid rgba(126, 34, 206, 0.2);
    border-radius: 8px;
    padding: 0.25rem 0.625rem;
}

.pdf-toolbar__page-input {
    width: 48px;
    border: none;
    outline: none;
    text-align: center;
    font-size: 0.875rem;
    font-weight: 600;
    color: #1e293b;
    background: transparent;
    -moz-appearance: textfield;
}

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

.pdf-toolbar__page-total {
    font-size: 0.875rem;
    font-weight: 500;
    color: #64748b;
}

.pdf-toolbar__zoom-slider-container {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.pdf-toolbar__zoom-slider {
    -webkit-appearance: none;
    width: 100%;
    min-width: 180px;
    max-width: 350px;
    height: 6px;
    border-radius: 3px;
    background: linear-gradient(90deg, 
        rgba(126, 34, 206, 0.1) 0%, 
        rgba(126, 34, 206, 0.2) 50%, 
        rgba(126, 34, 206, 0.1) 100%);
    outline: none;
    cursor: pointer;
}

.pdf-toolbar__zoom-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, #7e22ce 0%, #2a5298 100%);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(126, 34, 206, 0.3);
    transition: all 0.2s ease;
}

.pdf-toolbar__zoom-slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 4px 12px rgba(126, 34, 206, 0.4);
}

.pdf-toolbar__zoom-slider::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, #7e22ce 0%, #2a5298 100%);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 8px rgba(126, 34, 206, 0.3);
    transition: all 0.2s ease;
}

.pdf-toolbar__zoom-slider::-moz-range-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 4px 12px rgba(126, 34, 206, 0.4);
}

.pdf-toolbar__zoom-label {
    font-size: 0.75rem;
    font-weight: 700;
    color: #7e22ce;
    letter-spacing: 0.025em;
    min-width: 45px;
    text-align: center;
}

/* Signature Navigation Styles */
.pdf-toolbar__signature-nav {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    background: linear-gradient(135deg, rgba(126, 34, 206, 0.05) 0%, rgba(42, 82, 152, 0.05) 100%);
    border: 1px solid rgba(126, 34, 206, 0.2);
    border-radius: 10px;
    padding: 0.25rem 0.5rem;
    flex-shrink: 0;
}

.pdf-toolbar__btn--signature-nav {
    min-width: 30px;
    min-height: 30px;
    padding: 0.25rem;
    background: white;
    border: 1px solid rgba(126, 34, 206, 0.25);
}

.pdf-toolbar__btn--signature-nav:hover:not(:disabled) {
    background: linear-gradient(135deg, #7e22ce 0%, #2a5298 100%);
    border-color: transparent;
}

.pdf-toolbar__btn--signature-nav:hover:not(:disabled) svg {
    color: white;
}

.pdf-toolbar__signature-counter {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0 0.375rem;
}

.pdf-toolbar__signature-counter svg {
    color: #7e22ce;
    flex-shrink: 0;
}

.pdf-toolbar__signature-counter-text {
    font-size: 0.8125rem;
    font-weight: 600;
    color: #1e293b;
    white-space: nowrap;
}

.pdf-toolbar__signature-badge {
    font-size: 0.625rem;
    font-weight: 700;
    padding: 0.1875rem 0.5rem;
    border-radius: 5px;
    background: linear-gradient(135deg, rgba(126, 34, 206, 0.1) 0%, rgba(42, 82, 152, 0.1) 100%);
    color: #7e22ce;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.pdf-toolbar__signature-badge--complete {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(5, 150, 105, 0.1) 100%);
    color: #059669;
}

.pdf-frame {
    background: white;
    border-radius: 16px;
    box-shadow: 
        0 25px 50px -12px rgba(0, 0, 0, 0.25),
        0 0 0 1px rgba(255, 255, 255, 0.1);
    overflow: hidden;
    position: relative;
    flex: 1;
    width: 95%;
    display: flex;
    flex-direction: row;
    align-items: stretch;
}

.pdf-frame::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #7e22ce 0%, #2a5298 100%);
    z-index: 1;
    border-radius: 16px 16px 0 0;
}

.pdf-canvas-wrapper {
    flex: 1;
    overflow: auto;
    padding: 2rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
}

.pdf-page-container {
    position: relative;
    display: inline-block;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.pdf-canvas {
    display: block;
    vertical-align: top;
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
    transition: opacity 0.15s ease-out;
}

.pdf-canvas.rendering {
    opacity: 0;
}

.pdf-text-layer {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    opacity: 1;
    line-height: 1.0;
    pointer-events: auto;
}

.pdf-text-layer > span {
    color: transparent;
    position: absolute;
    white-space: pre;
    cursor: text;
    transform-origin: 0% 0%;
}

.pdf-text-layer ::selection {
    background: rgba(126, 34, 206, 0.3);
}

.pdf-text-layer ::-moz-selection {
    background: rgba(126, 34, 206, 0.3);
}

.pdf-signature-layer {
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    overflow: visible;
    pointer-events: none;
    z-index: 20;
}

.pdf-signature-layer .signature-button {
    pointer-events: auto;
}

.signature-button {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
}

.signature-button:focus {
    outline: 2px solid #7e22ce;
    outline-offset: 2px;
}

.signature-button:active {
    transform: scale(0.98);
}

.error-container {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 2rem;
}

.alert {
    border-radius: 12px;
    border: none;
    padding: 2rem;
    max-width: 600px;
}

.alert-danger {
    background: linear-gradient(135deg, #fff1f2 0%, #ffe4e6 100%);
    color: #be123c;
    border-left: 4px solid #e11d48;
}

.alert-warning {
    background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%);
    color: #92400e;
    border-left: 4px solid #f59e0b;
}

.spinner-border {
    border-width: 0.35rem;
}

@media (max-width: 768px) {
.envelope-content {
    padding: 0.75rem;
}

.pdf-thumbnails {
    width: 180px;
    border-radius: 0 0 0 16px;
}

.pdf-thumbnails__content {
    padding: 0.75rem;
    gap: 0.5rem;
}

.pdf-toolbar {
    flex-wrap: wrap;
    padding: 0.625rem 1rem;
    gap: 0.75rem;
    width: 98%;
    justify-content: center;
}

.pdf-toolbar__divider {
    display: none;
}

.pdf-toolbar__zoom-section {
    width: 100%;
    max-width: 100%;
}

.pdf-toolbar__zoom-slider {
    min-width: 150px;
}

.pdf-toolbar__btn--preset {
    padding: 0.425rem 0.75rem;
    font-size: 0.75rem;
}

.pdf-frame {
    border-radius: 12px;
    width: 98%;
    flex-direction: column;
}

.pdf-canvas-wrapper {
    padding: 1rem;
}

    .envelope-action-bar {
        padding: 1rem 1.25rem;
    }

    .envelope-action-bar__inner {
        flex-wrap: wrap;
    }

    .envelope-title {
        font-size: 1rem;
    }

    .envelope-key {
        font-size: 0.75rem;
    }

    .envelope-logo svg {
        width: 20px;
        height: 20px;
    }

    .alert {
        padding: 1.5rem;
    }
}