/* ==========================================================================
   Document Viewer Styles
   - A production-ready, mobile-first modal for viewing documents.
   - Reflects JD's 10-Layer System: Clarity, Function-First, and Unified Feeling.
   ========================================================================== */

.document-viewer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    opacity: 0;
    transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.document-viewer.visible {
    opacity: 1;
    pointer-events: auto;
}

.viewer-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(17, 24, 39, 0.6); /* --gray-900 with alpha */
    backdrop-filter: blur(4px);
}

.viewer-container {
    background-color: var(--modal-background);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-2xl);
    width: 90%;
    max-width: 800px;
    height: 85vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: scale(0.95);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.document-viewer.visible .viewer-container {
    transform: scale(1);
}

.viewer-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.viewer-actions {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.viewer-action-btn {
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

.viewer-action-btn:hover {
    background-color: var(--gray-200);
    color: var(--primary-color);
}

.viewer-action-btn .material-icons {
    font-size: 24px;
}

.viewer-title {
    font-size: var(--text-xl);
    font-weight: var(--font-semibold);
    color: var(--text-color);
    margin: 0;
}

.viewer-close-btn {
    background: none;
    border: none;
    color: var(--text-light);
    font-size: 2rem;
    line-height: 1;
    padding: 0;
    cursor: pointer;
    transition: color var(--transition-speed) ease;
}

.viewer-close-btn:hover {
    color: var(--error-500);
}

.viewer-content-wrapper {
    flex-grow: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.viewer-content {
    padding: var(--space-6) var(--space-8);
    line-height: 1.7;
    color: var(--gray-800);
}

.viewer-content h1, .viewer-content h2, .viewer-content h3 {
    color: var(--text-color);
    margin-bottom: 0.5em;
    line-height: 1.3;
}
.viewer-content p {
    margin-bottom: 1em;
}
.viewer-content ul, .viewer-content ol {
    margin-left: 1.5em;
    margin-bottom: 1em;
}
.viewer-content li {
    margin-bottom: 0.5em;
}
.viewer-content pre {
    background-color: var(--gray-100);
    padding: var(--space-4);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    overflow-x: auto;
    margin-bottom: 1em;
}
.viewer-content blockquote {
    border-left: 4px solid var(--primary-300);
    padding-left: var(--space-4);
    margin: 0 0 1em 0;
    color: var(--text-light);
    font-style: italic;
}
.viewer-content .error-message {
    color: var(--error-600);
    font-weight: var(--font-medium);
    text-align: center;
}

.viewer-spinner {
    border: 4px solid var(--gray-200);
    border-top: 4px solid var(--primary-500);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: var(--space-16) auto;
}

@media (max-width: 768px) {
    .viewer-container {
        width: 95%;
        height: 90vh;
    }
    .viewer-content {
        padding: var(--space-5) var(--space-4);
    }
    .viewer-title {
        font-size: var(--text-lg);
    }
}