.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;
}

.pdf-controls, .pdf-navigation {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.zoom-level, .page-info {
    font-size: 0.875rem;
    font-weight: 600;
    color: #475569;
    min-width: 60px;
    text-align: center;
}

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

.pdf-viewer-container {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.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: auto;
    position: relative;
    padding: 2rem;
    height: calc(100vh - 200px);
    width: 90%;
    max-width: 1200px;
    text-align: center;
}

.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 {
    display: inline-block;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    vertical-align: top;
}

.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-frame {
        border-radius: 12px;
        padding: 1rem;
        height: calc(100vh - 180px);
        width: 95%;
    }

    .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;
    }
}