:root {
    --primary: #1a73e8;
    --primary-dark: #1557b0;
    --primary-light: #e8f0fe;
    --sidebar-bg: #1e1e2e;
    --sidebar-text: #cdd6f4;
    --sidebar-hover: #313244;
    --sidebar-active: #45475a;
    --content-bg: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border: #e5e7eb;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    --code-bg: #1e1e2e;
    --code-text: #cdd6f4;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --card-shadow-hover: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    display: flex;
    min-height: 100vh;
    background: #f9fafb;
    color: var(--text-primary);
    line-height: 1.6;
}

/* SIDEBAR */
.sidebar {
    width: 280px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
    transition: transform 0.3s ease;
}

.sidebar-header {
    padding: 24px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.sidebar-header h2 {
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 4px;
}

.subtitle {
    font-size: 12px;
    color: #a6adc8;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-menu {
    list-style: none;
    padding: 8px 0;
}

/* NAV GROUPS */
.nav-group {
    margin-bottom: 4px;
}

.nav-group-header {
    padding: 10px 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.2s ease;
    border-radius: 6px;
    margin: 0 8px;
    user-select: none;
}

.nav-group-header:hover {
    background: var(--sidebar-hover);
}

.nav-group-icon {
    font-size: 16px;
    width: 20px;
    text-align: center;
}

.nav-group-title {
    flex: 1;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: #888da7;
}

.nav-group-toggle {
    font-size: 10px;
    transition: transform 0.2s ease;
    color: #6c7086;
}

.nav-group.collapsed .nav-group-toggle {
    transform: rotate(-90deg);
}

.nav-group-items {
    list-style: none;
    overflow: hidden;
    max-height: 800px;
    transition: max-height 0.3s ease;
}

.nav-group.collapsed .nav-group-items {
    max-height: 0;
}

.nav-group-items .nav-item {
    padding: 10px 16px 10px 28px;
    margin: 0 8px;
    border-radius: 6px;
    border-left: none;
    position: relative;
    font-size: 13px;
}

.nav-group-items .nav-item::before {
    content: '';
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: #585b70;
    transition: background 0.2s ease;
}

.nav-group-items .nav-item:hover::before {
    background: var(--primary);
}

.nav-group-items .nav-item.active::before {
    background: var(--primary);
}

.nav-item {
    padding: 12px 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.2s ease;
    border-left: 3px solid transparent;
    font-size: 14px;
}

.nav-item:hover {
    background: var(--sidebar-hover);
}

.nav-item.active {
    background: var(--sidebar-active);
    border-left-color: var(--primary);
    color: #fff;
}

.nav-icon {
    font-size: 18px;
    width: 24px;
    text-align: center;
}

/* CONTENT */
.content {
    margin-left: 280px;
    flex: 1;
    min-height: 100vh;
}

.page {
    display: none;
    padding: 40px 48px;
    max-width: 1200px;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.page-header {
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 2px solid var(--primary);
}

.page-header h1 {
    font-size: 32px;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.page-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
}

/* SECTIONS */
.content-section {
    margin-bottom: 48px;
}

.content-section h2 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.content-section h3 {
    font-size: 18px;
    font-weight: 600;
    margin: 20px 0 12px;
    color: var(--text-primary);
}

.content-section h4 {
    font-size: 15px;
    font-weight: 600;
    margin: 16px 0 8px;
    color: var(--primary-dark);
}

.content-section p {
    margin-bottom: 12px;
    color: #374151;
}

.content-section ul, .content-section ol {
    margin-left: 20px;
    margin-bottom: 16px;
}

.content-section li {
    margin-bottom: 6px;
    color: #374151;
}

/* INTRO CARD */
.intro-card {
    background: linear-gradient(135deg, var(--primary-light) 0%, #f0f7ff 100%);
    border: 1px solid #bfdbfe;
    border-radius: 12px;
    padding: 32px;
    margin-bottom: 40px;
}

.intro-card h2 {
    font-size: 24px;
    margin-bottom: 16px;
    color: var(--primary-dark);
}

.key-points {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-top: 24px;
}

.key-point {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}

.key-point h3 {
    font-size: 16px;
    margin-bottom: 8px;
    color: var(--primary);
}

/* FLOW DIAGRAMS */
.flow-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    margin: 24px 0;
}

.flow-node {
    background: white;
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 16px 24px;
    text-align: center;
    min-width: 280px;
    box-shadow: var(--card-shadow);
    transition: all 0.2s ease;
}

.flow-node:hover {
    box-shadow: var(--card-shadow-hover);
    border-color: var(--primary);
}

.flow-node h4 {
    color: var(--primary);
    margin-bottom: 4px;
}

.flow-node .small {
    font-size: 12px;
    color: var(--text-secondary);
}

.flow-arrow {
    font-size: 24px;
    color: var(--primary);
    font-weight: bold;
}

/* LIFECYCLE FLOW */
.lifecycle-flow {
    display: flex;
    align-items: center;
    gap: 8px;
    overflow-x: auto;
    padding: 24px 0;
}

.lifecycle-step {
    background: white;
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    min-width: 140px;
    text-align: center;
    box-shadow: var(--card-shadow);
    flex-shrink: 0;
}

.lifecycle-step .step-number {
    width: 32px;
    height: 32px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 8px;
    font-weight: 700;
    font-size: 14px;
}

.lifecycle-step h4 {
    font-size: 13px;
    margin-bottom: 4px;
    color: var(--primary-dark);
}

.lifecycle-step p {
    font-size: 11px;
    color: var(--text-secondary);
}

.lifecycle-arrow {
    font-size: 20px;
    color: var(--primary);
    flex-shrink: 0;
}

/* PATH GRID */
.path-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 24px;
}

.path-card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--card-shadow);
    border-top: 4px solid var(--primary);
}

.path-card h3 {
    margin-bottom: 12px;
    color: var(--primary);
}

.path-card ul {
    list-style: none;
    margin-left: 0;
}

.path-card li {
    padding: 6px 0;
    padding-left: 20px;
    position: relative;
}

.path-card li::before {
    content: "\2713";
    position: absolute;
    left: 0;
    color: var(--success);
    font-weight: bold;
}

/* TECH STACK */
.tech-stack {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.tech-item {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    text-align: center;
}

.tech-item h4 {
    color: var(--primary);
    margin-bottom: 8px;
}

/* HIERARCHY */
.hierarchy-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    margin: 24px 0;
}

.hierarchy-level {
    display: flex;
    justify-content: center;
}

.hierarchy-node {
    background: white;
    border: 2px solid var(--primary);
    border-radius: 8px;
    padding: 16px 24px;
    text-align: center;
    box-shadow: var(--card-shadow);
    min-width: 300px;
}

.hierarchy-node.top {
    background: var(--primary);
    color: white;
}

.hierarchy-node.top h4 {
    color: white;
}

.hierarchy-node.top p {
    color: rgba(255,255,255,0.8);
}

.hierarchy-connector {
    width: 2px;
    height: 24px;
    background: var(--primary);
}

/* DEVELOPER NOTE */
.developer-note {
    background: #fefce8;
    border-left: 4px solid var(--warning);
    padding: 20px;
    border-radius: 0 8px 8px 0;
    margin: 24px 0;
}

.developer-note h3 {
    color: #854d0e;
    margin-bottom: 8px;
}

.developer-note p {
    color: #713f12;
}

.developer-note pre {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 16px;
    border-radius: 8px;
    overflow-x: auto;
    margin-top: 12px;
    font-size: 13px;
    line-height: 1.5;
}

/* TABLES */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
}

thead {
    background: var(--primary);
    color: white;
}

th, td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    font-weight: 600;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

td {
    font-size: 14px;
}

tbody tr:hover {
    background: var(--primary-light);
}

code {
    background: #f3f4f6;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
    color: var(--primary-dark);
}

/* ROLES GRID */
.roles-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.role-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}

.role-card h4 {
    color: var(--primary);
    margin-bottom: 8px;
}

.role-permissions {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 12px;
}

.perm {
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 500;
}

/* NUMBERING */
.numbering-examples {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin: 20px 0;
}

.numbering-item {
    background: white;
    padding: 16px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}

/* METHOD CARDS */
.method-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin: 24px 0;
}

.method-card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

.method-card h3 {
    color: var(--primary);
    margin-bottom: 12px;
}

.tech-detail {
    background: #f9fafb;
    padding: 16px;
    border-radius: 8px;
    margin-top: 16px;
}

.tech-detail ol {
    margin-left: 16px;
}

/* DATA MODEL */
.data-model-diagram {
    display: flex;
    align-items: center;
    gap: 16px;
    overflow-x: auto;
    padding: 24px 0;
}

.model-object {
    background: white;
    border: 2px solid var(--primary);
    border-radius: 8px;
    padding: 16px;
    min-width: 200px;
    box-shadow: var(--card-shadow);
    flex-shrink: 0;
}

.model-object h4 {
    color: var(--primary);
    margin-bottom: 8px;
    font-family: monospace;
}

.model-object ul {
    list-style: none;
    margin-left: 0;
    font-size: 13px;
}

.model-object li {
    padding: 2px 0;
    font-family: monospace;
    font-size: 12px;
}

.model-relationship {
    font-size: 14px;
    font-weight: 700;
    color: var(--primary);
    flex-shrink: 0;
}

/* CART FLOW */
.cart-flow {
    display: flex;
    align-items: center;
    gap: 8px;
    overflow-x: auto;
    padding: 24px 0;
}

.cart-step {
    background: white;
    padding: 16px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    min-width: 140px;
    text-align: center;
    flex-shrink: 0;
}

.cart-arrow {
    font-size: 20px;
    color: var(--primary);
    flex-shrink: 0;
}

/* PO LIFECYCLE */
.po-lifecycle {
    display: flex;
    align-items: center;
    gap: 8px;
    overflow-x: auto;
    padding: 24px 0;
}

.po-status {
    background: white;
    padding: 16px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    min-width: 120px;
    text-align: center;
    flex-shrink: 0;
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin: 0 auto 8px;
}

.status-indicator.new { background: var(--info); }
.status-indicator.ordered { background: var(--warning); }
.status-indicator.received { background: var(--success); }
.status-indicator.closed { background: #6b7280; }
.status-indicator.cancelled { background: var(--error); }

.po-arrow {
    font-size: 20px;
    color: var(--primary);
    flex-shrink: 0;
}

/* TRANSMISSION GRID */
.transmission-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.transmission-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}

.transmission-card h3 {
    color: var(--primary);
    margin-bottom: 8px;
}

/* REVISION FLOW */
.revision-flow {
    display: flex;
    align-items: center;
    gap: 8px;
    overflow-x: auto;
    padding: 24px 0;
}

.revision-step {
    background: white;
    padding: 16px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    min-width: 140px;
    text-align: center;
    flex-shrink: 0;
}

.revision-arrow {
    font-size: 14px;
    color: var(--primary);
    flex-shrink: 0;
}

/* RECEIVING */
.receiving-types {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin: 24px 0;
}

.receiving-type {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

.receiving-type h3 {
    color: var(--primary);
    margin-bottom: 12px;
}

/* MATCHING */
.matching-comparison {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin: 24px 0;
}

.matching-card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    border-top: 4px solid var(--primary);
}

.matching-card.highlighted {
    border-top-color: var(--success);
    background: linear-gradient(135deg, #f0fdf4 0%, white 100%);
}

.match-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 16px 0;
}

.match-item {
    background: var(--primary-light);
    padding: 8px 12px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 13px;
}

.match-operator {
    color: var(--primary);
    font-weight: bold;
}

/* INVOICE SOURCES */
.invoice-sources {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.source-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}

.source-card h3 {
    color: var(--primary);
    margin-bottom: 8px;
}

/* NON-PO FLOW */
.non-po-flow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    margin: 24px 0;
}

/* APPROVALS */
.approval-flow-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    margin: 24px 0;
}

.approval-step {
    background: white;
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 16px 24px;
    text-align: center;
    min-width: 300px;
    box-shadow: var(--card-shadow);
}

.approval-step h4 {
    color: var(--primary);
    margin-bottom: 4px;
}

.approval-arrow {
    font-size: 24px;
    color: var(--primary);
}

.condition-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.condition-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}

.condition-card h3 {
    color: var(--primary);
    margin-bottom: 12px;
}

/* APPROVAL TYPES */
.approval-types {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin: 24px 0;
}

.approval-type-card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

.approval-type-card h3 {
    color: var(--primary);
    margin-bottom: 12px;
}

.approval-chain {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 16px 0;
}

.approver {
    background: var(--primary-light);
    padding: 6px 12px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 13px;
}

.chain-arrow {
    color: var(--primary);
    font-weight: bold;
}

/* SUPPLIER */
.supplier-data-model {
    display: flex;
    align-items: center;
    gap: 16px;
    overflow-x: auto;
    padding: 24px 0;
}

.supplier-types {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin: 24px 0;
}

.supplier-type-card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

.supplier-type-card h3 {
    color: var(--primary);
    margin-bottom: 12px;
}

.onboarding-flow {
    display: flex;
    align-items: center;
    gap: 8px;
    overflow-x: auto;
    padding: 24px 0;
}

.onboarding-step {
    background: white;
    padding: 16px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    min-width: 160px;
    text-align: center;
    flex-shrink: 0;
}

.onboarding-arrow {
    font-size: 20px;
    color: var(--primary);
    flex-shrink: 0;
}

.csp-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.csp-feature {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}

.csp-feature h3 {
    color: var(--primary);
    margin-bottom: 8px;
}

/* CONTRACTS */
.contract-lifecycle {
    display: flex;
    align-items: center;
    gap: 8px;
    overflow-x: auto;
    padding: 24px 0;
}

.contract-step {
    background: white;
    padding: 16px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    min-width: 140px;
    text-align: center;
    flex-shrink: 0;
}

.contract-arrow {
    font-size: 20px;
    color: var(--primary);
    flex-shrink: 0;
}

.contract-po-flow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    margin: 24px 0;
}

/* INTEGRATIONS */
.integration-architecture {
    margin: 24px 0;
}

.integration-layer {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

.integration-layer h3 {
    color: var(--primary);
    margin-bottom: 16px;
}

.erp-flow {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.erp-direction h4 {
    color: var(--primary);
    margin-bottom: 8px;
}

.integration-methods {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.pattern-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin: 24px 0;
}

.pattern-card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

.pattern-card h3 {
    color: var(--primary);
    margin-bottom: 12px;
}

.pattern-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 16px 0;
}

.pattern-node {
    background: var(--primary-light);
    padding: 8px 12px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 13px;
}

.pattern-arrow {
    color: var(--primary);
    font-weight: bold;
}

/* IMPLEMENTATION */
.implementation-phases {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin: 24px 0;
}

.phase-card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    position: relative;
}

.phase-number {
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 12px;
}

.phase-card h3 {
    color: var(--primary);
    margin-bottom: 4px;
}

.phase-duration {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.workbook-sections {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.workbook-section {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}

.workbook-section h3 {
    color: var(--primary);
    margin-bottom: 12px;
}

.migration-flow {
    display: flex;
    align-items: center;
    gap: 8px;
    overflow-x: auto;
    padding: 24px 0;
}

.migration-step {
    background: white;
    padding: 16px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    min-width: 140px;
    text-align: center;
    flex-shrink: 0;
}

.migration-arrow {
    font-size: 20px;
    color: var(--primary);
    flex-shrink: 0;
}

.migration-objects {
    background: #fefce8;
    border-left: 4px solid var(--warning);
    padding: 20px;
    border-radius: 0 8px 8px 0;
    margin: 24px 0;
}

.testing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin: 24px 0;
}

.testing-card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

.testing-card h3 {
    color: var(--primary);
    margin-bottom: 12px;
}

/* DATA MODEL PAGE */
.full-data-flow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    margin: 24px 0;
}

.data-flow-node {
    background: white;
    border: 2px solid var(--primary);
    border-radius: 8px;
    padding: 16px 24px;
    text-align: center;
    min-width: 300px;
    box-shadow: var(--card-shadow);
}

.data-flow-node h4 {
    color: var(--primary);
    margin-bottom: 4px;
    font-family: monospace;
}

.data-flow-arrow {
    font-size: 16px;
    color: var(--primary);
    font-weight: bold;
}

.relationships-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin: 24px 0;
}

.relationship-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}

.relationship-card h3 {
    color: var(--primary);
    margin-bottom: 12px;
}

.relationship-card pre {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 16px;
    border-radius: 8px;
    font-size: 12px;
    line-height: 1.5;
    overflow-x: auto;
}

.custom-fields-explanation {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

/* REPORTING */
.analytics-dashboards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.dashboard-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}

.dashboard-card h3 {
    color: var(--primary);
    margin-bottom: 12px;
}

.export-options {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.export-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}

.export-card h3 {
    color: var(--primary);
    margin-bottom: 8px;
}

/* BEST PRACTICES */
.best-practice-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin: 24px 0;
}

.best-practice-card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    border-left: 4px solid var(--success);
}

.best-practice-card h3 {
    color: var(--success);
    margin-bottom: 12px;
}

.dev-tips {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.dev-tip {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}

.dev-tip h3 {
    color: var(--primary);
    margin-bottom: 8px;
}

.dev-tip pre {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 12px;
    border-radius: 8px;
    font-size: 12px;
    margin-top: 8px;
    overflow-x: auto;
}

.pitfalls-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin: 24px 0;
}

.pitfall-card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    border-left: 4px solid var(--error);
}

.pitfall-card h3 {
    color: var(--error);
    margin-bottom: 12px;
}

.career-path {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin: 24px 0;
}

.career-step {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    border-left: 4px solid var(--primary);
}

.career-step h3 {
    color: var(--primary);
    margin-bottom: 12px;
}

/* NAVIGATION HINT */
.navigation-hint {
    text-align: center;
    padding: 40px;
    color: var(--text-secondary);
    font-size: 16px;
}

/* RESPONSIVE */
@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .content {
        margin-left: 0;
    }
    
    .page {
        padding: 24px;
    }
    
    .key-points,
    .path-grid,
    .roles-grid,
    .tech-stack,
    .numbering-examples,
    .method-cards,
    .transmission-grid,
    .receiving-types,
    .matching-comparison,
    .invoice-sources,
    .condition-grid,
    .approval-types,
    .supplier-types,
    .csp-features,
    .integration-methods,
    .pattern-cards,
    .implementation-phases,
    .workbook-sections,
    .testing-grid,
    .relationships-grid,
    .analytics-dashboards,
    .export-options,
    .best-practice-grid,
    .dev-tips,
    .pitfalls-grid,
    .erp-flow {
        grid-template-columns: 1fr;
    }
    
    .lifecycle-flow,
    .cart-flow,
    .po-lifecycle,
    .revision-flow,
    .onboarding-flow,
    .contract-lifecycle,
    .migration-flow {
        flex-direction: column;
    }
    
    .lifecycle-arrow,
    .cart-arrow,
    .po-arrow,
    .revision-arrow,
    .onboarding-arrow,
    .contract-arrow,
    .migration-arrow {
        transform: rotate(90deg);
    }
    
    .data-model-diagram,
    .supplier-data-model {
        flex-direction: column;
    }
    
    .model-relationship {
        transform: rotate(90deg);
    }
}

/* ============================================
   NEW MODULE CSS CLASSES
   ============================================ */

/* CONDITIONS FRAMEWORK */
.condition-structure {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.condition-part {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    border-top: 3px solid var(--primary);
}

.condition-part h4 {
    color: var(--primary);
    margin-bottom: 8px;
}

.condition-part pre {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 12px;
    border-radius: 6px;
    font-size: 12px;
    margin-top: 8px;
    overflow-x: auto;
}

.condition-types-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.condition-type-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    border-left: 4px solid var(--primary);
}

.condition-type-card h3 {
    color: var(--primary);
    margin-bottom: 8px;
    font-size: 16px;
}

.evaluation-order {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    margin: 24px 0;
}

.eval-step {
    background: white;
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 16px 24px;
    text-align: center;
    min-width: 300px;
    box-shadow: var(--card-shadow);
    display: flex;
    align-items: center;
    gap: 16px;
}

.eval-number {
    width: 36px;
    height: 36px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
    flex-shrink: 0;
}

.eval-step h4 {
    color: var(--primary);
    margin-bottom: 4px;
    text-align: left;
}

.eval-step p {
    font-size: 13px;
    color: var(--text-secondary);
    text-align: left;
}

.eval-arrow {
    font-size: 24px;
    color: var(--primary);
    font-weight: bold;
}

.flex-fields-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.flex-field-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    border-top: 3px solid var(--info);
}

.flex-field-card h3 {
    color: var(--info);
    margin-bottom: 8px;
    font-size: 16px;
}

.flex-field-card pre {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 12px;
    border-radius: 6px;
    font-size: 12px;
    margin-top: 8px;
    overflow-x: auto;
}

/* BUDGET MANAGEMENT */
.budget-flow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    margin: 24px 0;
}

.budget-step {
    background: white;
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 16px 24px;
    text-align: center;
    min-width: 280px;
    box-shadow: var(--card-shadow);
    display: flex;
    align-items: center;
    gap: 16px;
}

.budget-step .eval-number {
    width: 36px;
    height: 36px;
    background: var(--success);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
    flex-shrink: 0;
}

.budget-step h4 {
    color: var(--success);
    margin-bottom: 4px;
    text-align: left;
}

.budget-step p {
    font-size: 13px;
    color: var(--text-secondary);
    text-align: left;
}

.budget-arrow {
    font-size: 24px;
    color: var(--success);
    font-weight: bold;
}

.budget-actions {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.budget-action {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    border-top: 4px solid var(--border);
}

.budget-action.pass {
    border-top-color: var(--success);
    background: linear-gradient(135deg, #f0fdf4 0%, white 100%);
}

.budget-action.warn {
    border-top-color: var(--warning);
    background: linear-gradient(135deg, #fefce8 0%, white 100%);
}

.budget-action.block {
    border-top-color: var(--error);
    background: linear-gradient(135deg, #fef2f2 0%, white 100%);
}

.budget-action.override {
    border-top-color: var(--info);
    background: linear-gradient(135deg, #eff6ff 0%, white 100%);
}

.budget-action h3 {
    margin-bottom: 8px;
    font-size: 16px;
}

.budget-timeline {
    margin: 24px 0;
}

.budget-integration-options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin: 24px 0;
}

.budget-option {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
}

.budget-option h3 {
    color: var(--primary);
    margin-bottom: 12px;
}

.override-flow {
    margin: 24px 0;
}

/* SOURCING & AUCTIONS */
.sourcing-lifecycle {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    margin: 24px 0;
}

.sourcing-step {
    background: white;
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 16px 24px;
    text-align: center;
    min-width: 200px;
    box-shadow: var(--card-shadow);
    display: flex;
    align-items: center;
    gap: 16px;
}

.sourcing-step .eval-number {
    width: 36px;
    height: 36px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
    flex-shrink: 0;
}

.sourcing-step h4 {
    color: var(--primary);
    margin-bottom: 4px;
    text-align: left;
}

.sourcing-step p {
    font-size: 13px;
    color: var(--text-secondary);
    text-align: left;
}

.sourcing-arrow {
    font-size: 24px;
    color: var(--primary);
    font-weight: bold;
}

.event-types-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.event-type-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    border-left: 4px solid var(--primary);
}

.event-type-card h3 {
    color: var(--primary);
    margin-bottom: 8px;
    font-size: 15px;
}

.bid-analysis-example {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    margin: 24px 0;
}

.bid-analysis-example h4 {
    color: var(--primary);
    margin-bottom: 12px;
}

.auction-types-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.auction-type {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    border-top: 3px solid var(--warning);
}

.auction-type h3 {
    color: var(--warning);
    margin-bottom: 8px;
    font-size: 15px;
}

/* REAL BUSINESS SCENARIOS */
.scenario-detail {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    margin-bottom: 24px;
}

.scenario-detail h4 {
    color: var(--primary);
    margin: 16px 0 8px;
}

.scenario-detail h4:first-child {
    margin-top: 0;
}

.scenario-flow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    margin: 16px 0;
}

.scenario-step {
    background: var(--primary-light);
    border: 1px solid #bfdbfe;
    border-radius: 8px;
    padding: 16px;
    min-width: 280px;
    text-align: center;
}

.scenario-step h4 {
    color: var(--primary-dark);
    margin-bottom: 4px;
}

.scenario-step p {
    font-size: 13px;
    color: #374151;
}

.scenario-arrow {
    font-size: 24px;
    color: var(--primary);
    font-weight: bold;
}

/* INTEGRATION FIELD MAPPINGS */
.mapping-table {
    margin: 16px 0;
}

.integration-best-practices {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin: 24px 0;
}

/* TROUBLESHOOTING */
.troubleshooting-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.troubleshooting-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    border-left: 4px solid var(--error);
}

.troubleshooting-card h3 {
    color: var(--error);
    margin-bottom: 12px;
    font-size: 16px;
}

.debug-checklist {
    margin: 24px 0;
}

/* HANDS-ON LABS */
.lab-card {
    background: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    margin-bottom: 24px;
    border-left: 4px solid var(--success);
}

.lab-card h3 {
    color: var(--success);
    margin-bottom: 12px;
}

.lab-steps {
    margin-top: 16px;
}

.lab-steps h4 {
    color: var(--primary);
    margin: 16px 0 8px;
}

.lab-steps h4:first-child {
    margin-top: 0;
}

.lab-steps pre {
    background: var(--code-bg);
    color: var(--code-text);
    padding: 16px;
    border-radius: 8px;
    font-size: 13px;
    margin: 12px 0;
    overflow-x: auto;
}

/* CLIENT PLAYBOOK */
.playbook-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.playbook-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    border-top: 3px solid var(--primary);
}

.playbook-card h3 {
    color: var(--primary);
    margin-bottom: 8px;
    font-size: 15px;
}

.comparison-table {
    margin: 24px 0;
    overflow-x: auto;
}

.glossary-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.glossary-item {
    background: white;
    padding: 16px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
}

.glossary-item h4 {
    color: var(--primary);
    margin-bottom: 4px;
    font-size: 14px;
}

.glossary-item p {
    font-size: 13px;
    color: var(--text-secondary);
}

.quick-ref-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin: 24px 0;
}

.quick-ref-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: var(--card-shadow);
    border-left: 4px solid var(--info);
}

.quick-ref-card h3 {
    color: var(--info);
    margin-bottom: 12px;
}

.quick-ref-card ul {
    list-style: none;
    margin-left: 0;
}

.quick-ref-card li {
    padding: 4px 0;
    padding-left: 16px;
    position: relative;
    font-size: 14px;
}

.quick-ref-card li::before {
    content: "\2022";
    position: absolute;
    left: 0;
    color: var(--info);
    font-weight: bold;
}

/* MODULE MAP (Overview Page) */
.module-map {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin: 32px 0;
}

.module-map-group {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
}

.module-map-header {
    padding: 16px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.module-map-header .map-icon {
    font-size: 20px;
}

.module-map-header h3 {
    flex: 1;
    margin: 0;
    font-size: 16px;
}

.module-map-header .map-badge {
    font-size: 11px;
    padding: 4px 10px;
    border-radius: 20px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.module-map-header.business {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
}
.module-map-header.business h3 { color: #92400e; }
.module-map-header.business .map-badge { background: #92400e; color: #fef3c7; }

.module-map-header.functional {
    background: linear-gradient(135deg, #dbeafe, #bfdbfe);
}
.module-map-header.functional h3 { color: #1e40af; }
.module-map-header.functional .map-badge { background: #1e40af; color: #dbeafe; }

.module-map-header.technical {
    background: linear-gradient(135deg, #d1fae5, #a7f3d0);
}
.module-map-header.technical h3 { color: #065f46; }
.module-map-header.technical .map-badge { background: #065f46; color: #d1fae5; }

.module-map-header.advanced {
    background: linear-gradient(135deg, #ede9fe, #ddd6fe);
}
.module-map-header.advanced h3 { color: #5b21b6; }
.module-map-header.advanced .map-badge { background: #5b21b6; color: #ede9fe; }

.module-map-header.implementation {
    background: linear-gradient(135deg, #fce7f3, #fbcfe8);
}
.module-map-header.implementation h3 { color: #9d174d; }
.module-map-header.implementation .map-badge { background: #9d174d; color: #fce7f3; }

.module-map-items {
    padding: 8px 0;
}

.map-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 20px;
    transition: background 0.2s ease;
}

.map-item:hover {
    background: #f9fafb;
}

.map-item-icon {
    font-size: 18px;
    width: 24px;
    text-align: center;
    flex-shrink: 0;
    margin-top: 2px;
}

.map-item strong {
    font-size: 14px;
    color: var(--text-primary);
    display: block;
    margin-bottom: 2px;
}

.map-item p {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 0;
}

/* RESPONSIVE UPDATES FOR NEW CLASSES */
@media (max-width: 1024px) {
    .condition-structure,
    .condition-types-grid,
    .flex-fields-grid,
    .budget-actions,
    .event-types-grid,
    .auction-types-grid,
    .troubleshooting-grid,
    .quick-ref-grid {
        grid-template-columns: 1fr;
    }
    
    .budget-integration-options,
    .integration-best-practices,
    .playbook-grid {
        grid-template-columns: 1fr;
    }
    
    .glossary-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .evaluation-order,
    .budget-flow,
    .sourcing-lifecycle,
    .scenario-flow {
        flex-direction: column;
    }
    
    .eval-arrow,
    .budget-arrow,
    .sourcing-arrow,
    .scenario-arrow {
        transform: rotate(90deg);
    }
}