/* =================================================================
   WHITEPAPER STYLES
   Premium document layout for technical documentation
   ================================================================= */

.wp-header {
    padding: calc(var(--spacing-unit) * 20) 0 calc(var(--spacing-unit) * 10);
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border-subtle);
    margin-top: 80px;
}

.wp-header-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 calc(var(--spacing-unit) * 4);
    text-align: center;
}

.wp-meta {
    display: flex;
    justify-content: center;
    gap: calc(var(--spacing-unit) * 2);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.12em;
    color: var(--color-text-tertiary);
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.wp-meta .separator {
    color: var(--color-border-primary);
}

.wp-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.wp-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: calc(var(--spacing-unit) * 6);
}

.btn-print {
    margin-top: calc(var(--spacing-unit) * 2);
}

/* Table of Contents Sidebar */
.wp-toc {
    position: fixed;
    left: 0;
    top: 120px;
    width: 240px;
    height: calc(100vh - 140px);
    padding: calc(var(--spacing-unit) * 4);
    background: var(--color-bg-secondary);
    border-right: 1px solid var(--color-border-subtle);
    overflow-y: auto;
    z-index: 100;
}

.toc-header {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    color: var(--color-text-tertiary);
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.toc-nav {
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 1.5);
}

.toc-link {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    text-decoration: none;
    padding: calc(var(--spacing-unit) * 1) 0;
    border-left: 2px solid transparent;
    padding-left: calc(var(--spacing-unit) * 2);
    margin-left: -2px;
    transition: all var(--duration-quick) var(--transition-smooth);
}

.toc-link:hover,
.toc-link.active {
    color: var(--color-text-primary);
    border-left-color: var(--color-accent);
}

/* Main Content */
.wp-content {
    margin-left: 240px;
    padding: calc(var(--spacing-unit) * 8) 0;
    background: var(--color-bg-secondary);
    min-height: 100vh;
}

.wp-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 calc(var(--spacing-unit) * 6);
}

.wp-section {
    margin-bottom: calc(var(--spacing-unit) * 12);
}

.wp-section h2 {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: calc(var(--spacing-unit) * 4);
    padding-bottom: calc(var(--spacing-unit) * 2);
    border-bottom: 1px solid var(--color-border-subtle);
}

.wp-section h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: calc(var(--spacing-unit) * 6);
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.wp-section p {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.wp-section p.lead {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-text-primary);
    line-height: 1.7;
}

.wp-section ul,
.wp-section ol {
    margin-bottom: calc(var(--spacing-unit) * 3);
    padding-left: calc(var(--spacing-unit) * 4);
}

.wp-section li {
    font-size: 1.0625rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.wp-section a {
    color: var(--color-accent);
    text-decoration: none;
    border-bottom: 1px solid var(--color-border-bright);
    transition: border-color var(--duration-quick) var(--transition-smooth);
}

.wp-section a:hover {
    border-bottom-color: var(--color-accent);
}

/* Callout Boxes */
.wp-callout {
    padding: calc(var(--spacing-unit) * 3);
    background: var(--color-surface);
    border: 1px solid var(--color-border-bright);
    border-left: 3px solid var(--color-accent);
    margin: calc(var(--spacing-unit) * 4) 0;
}

.wp-callout strong {
    display: block;
    font-weight: 700;
    margin-bottom: calc(var(--spacing-unit) * 1);
    color: var(--color-text-primary);
}

.wp-callout p {
    margin-bottom: 0;
}

.wp-callout-warning {
    border-left-color: #ff6464;
}

/* FAQ Items */
.faq-item {
    padding: calc(var(--spacing-unit) * 4) 0;
    border-bottom: 1px solid var(--color-border-subtle);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-item h3 {
    margin-top: 0;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.faq-item p {
    margin-bottom: 0;
}

/* Conclusion Section */
.wp-conclusion {
    text-align: center;
    padding: calc(var(--spacing-unit) * 8);
    background: var(--color-surface);
    border: 1px solid var(--color-border-bright);
}

.wp-cta {
    display: flex;
    gap: calc(var(--spacing-unit) * 2);
    justify-content: center;
    margin-top: calc(var(--spacing-unit) * 6);
    flex-wrap: wrap;
}

.btn-large {
    padding: calc(var(--spacing-unit) * 2.5) calc(var(--spacing-unit) * 5);
    font-size: 1.0625rem;
}

/* Document Meta */
.wp-document-meta {
    padding: calc(var(--spacing-unit) * 6);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-subtle);
    margin-top: calc(var(--spacing-unit) * 8);
}

.meta-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: calc(var(--spacing-unit) * 4);
    margin-bottom: calc(var(--spacing-unit) * 4);
    padding-bottom: calc(var(--spacing-unit) * 4);
    border-bottom: 1px solid var(--color-border-subtle);
}

.meta-grid div {
    display: flex;
    flex-direction: column;
    gap: calc(var(--spacing-unit) * 1);
}

.meta-grid strong {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--color-text-tertiary);
}

.meta-grid span {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.meta-disclaimer {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    line-height: 1.6;
    margin: 0;
}

/* Print Styles */
@media print {
    .nav,
    .wp-toc,
    .footer,
    .btn-print {
        display: none !important;
    }
    
    .wp-content {
        margin-left: 0;
    }
    
    .wp-header {
        margin-top: 0;
        padding-top: calc(var(--spacing-unit) * 8);
    }
    
    .wp-section {
        page-break-inside: avoid;
    }
    
    .wp-section h2 {
        page-break-after: avoid;
    }
    
    body {
        background: white;
        color: black;
    }
}

/* Responsive Design */
@media (max-width: 1200px) {
    .wp-toc {
        width: 200px;
    }
    
    .wp-content {
        margin-left: 200px;
    }
}

@media (max-width: 1024px) {
    .wp-toc {
        display: none;
    }
    
    .wp-content {
        margin-left: 0;
    }
    
    .wp-header {
        margin-top: 70px;
    }
}

@media (max-width: 768px) {
    .wp-meta {
        flex-direction: column;
        gap: calc(var(--spacing-unit) * 1);
    }
    
    .wp-meta .separator {
        display: none;
    }
    
    .meta-grid {
        grid-template-columns: 1fr;
        gap: calc(var(--spacing-unit) * 3);
    }
    
    .wp-cta {
        flex-direction: column;
    }
    
    .btn-large {
        width: 100%;
        justify-content: center;
    }
}