/* =============================================================
   supplychain.wiki - Collaborative Knowledge Repository
   Three-column wiki architecture with topic tree navigation
   ============================================================= */

/* CSS Custom Properties */
:root {
    --color-primary-green: #2D8A4E;
    --color-leaf-light: #E8F5EC;
    --color-charcoal: #1C2B1F;
    --color-slate: #5A6B5E;
    --color-parchment: #FAFDF8;
    --color-soft-moss: #F2F7F0;
    --color-reference-blue: #5A7D8C;
    --color-node-cream: #E6EFE2;
    --color-amber: #D4A843;
    --color-fern-gray: #C8D5C4;
    --color-graph-lines: #E8EDE6;
    --color-code-bg: #F0F4F0;

    --font-heading: 'Source Sans 3', sans-serif;
    --font-body: 'Merriweather', Georgia, serif;
    --font-code: 'Source Code Pro', monospace;

    --grid-gap: 20px;
    --max-width: 1440px;
    --sidebar-width: 260px;
    --margin-width: 240px;
    --top-bar-height: 52px;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    font-weight: 300;
    font-size: clamp(0.95rem, 1.1vw, 1.05rem);
    line-height: 1.75;
    color: var(--color-charcoal);
    background-color: var(--color-parchment);
    /* Graph paper background texture */
    background-image:
        repeating-linear-gradient(0deg, var(--color-graph-lines) 0px, var(--color-graph-lines) 1px, transparent 1px, transparent 40px),
        repeating-linear-gradient(90deg, var(--color-graph-lines) 0px, var(--color-graph-lines) 1px, transparent 1px, transparent 40px);
    background-size: 40px 40px;
    background-attachment: fixed;
    min-height: 100vh;
}

/* ---- Top Bar ---- */
.top-bar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-parchment);
    border-bottom: 1px solid var(--color-fern-gray);
    height: var(--top-bar-height);
    backdrop-filter: blur(8px);
    background-color: rgba(250, 253, 248, 0.95);
}

.top-bar-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    height: 100%;
    padding: 0 24px;
    gap: 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.logo-icon {
    display: block;
}

.logo-text {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.15rem;
    color: var(--color-charcoal);
    letter-spacing: -0.01em;
}

.logo-dot {
    color: var(--color-primary-green);
}

.top-bar-search {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--color-soft-moss);
    border: 1px solid var(--color-fern-gray);
    border-radius: 6px;
    padding: 6px 14px;
    flex: 0 1 280px;
    cursor: pointer;
    transition: border-color 0.2s;
}

.top-bar-search:hover {
    border-color: var(--color-primary-green);
}

.search-icon {
    flex-shrink: 0;
    opacity: 0.6;
}

.search-placeholder {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    color: var(--color-slate);
    opacity: 0.7;
}

.top-bar-nav {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-left: auto;
}

.nav-link {
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--color-slate);
    cursor: pointer;
    padding: 4px 0;
    border-bottom: 2px solid transparent;
    transition: color 0.2s, border-color 0.2s;
}

.nav-link:hover {
    color: var(--color-charcoal);
}

.nav-link.active {
    color: var(--color-primary-green);
    border-bottom-color: var(--color-primary-green);
}

/* ---- Main Wiki Layout (3-column grid) ---- */
.wiki-layout {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr var(--margin-width);
    grid-template-areas: "sidebar content margin";
    gap: var(--grid-gap);
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- Left Sidebar: Topic Tree Navigator ---- */
.sidebar {
    grid-area: sidebar;
    position: sticky;
    top: calc(var(--top-bar-height) + 16px);
    max-height: calc(100vh - var(--top-bar-height) - 32px);
    overflow-y: auto;
    padding: 16px 0;
    scrollbar-width: thin;
    scrollbar-color: var(--color-fern-gray) transparent;
}

.sidebar::-webkit-scrollbar {
    width: 4px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--color-fern-gray);
    border-radius: 2px;
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-slate);
    padding: 0 12px 12px;
    border-bottom: 1px solid var(--color-fern-gray);
    margin-bottom: 8px;
}

.branch-icon {
    flex-shrink: 0;
}

/* Topic Tree */
.topic-tree {
    padding: 0 4px;
}

.tree-node {
    list-style: none;
}

.tree-node > summary {
    list-style: none;
}

.tree-node > summary::-webkit-details-marker {
    display: none;
}

.tree-node > summary::marker {
    display: none;
    content: '';
}

.tree-label {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 5px 12px;
    font-family: var(--font-heading);
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--color-charcoal);
    cursor: pointer;
    border-left: 2px solid transparent;
    border-radius: 0 4px 4px 0;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
    user-select: none;
}

.tree-label:hover {
    background: var(--color-leaf-light);
}

.tree-label.active-label {
    border-left-color: var(--color-primary-green);
    color: var(--color-primary-green);
    font-weight: 600;
    background: var(--color-leaf-light);
}

.tree-leaf {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 12px 4px 28px;
    font-family: var(--font-heading);
    font-size: 0.82rem;
    font-weight: 400;
    color: var(--color-slate);
    cursor: pointer;
    border-left: 2px solid transparent;
    border-radius: 0 4px 4px 0;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.tree-leaf:hover {
    background: var(--color-leaf-light);
    color: var(--color-charcoal);
}

.tree-leaf.active-label {
    border-left-color: var(--color-primary-green);
    color: var(--color-primary-green);
    font-weight: 600;
}

.tree-children {
    position: relative;
    padding-left: 12px;
}

.tree-children::before {
    content: '';
    position: absolute;
    left: 22px;
    top: 0;
    bottom: 8px;
    width: 1px;
    border-left: 1px dotted var(--color-fern-gray);
}

/* Tree indicators */
.tree-indicator {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-fern-gray);
    flex-shrink: 0;
    transition: background 0.2s, transform 0.2s;
}

.tree-indicator.active,
.active-label .tree-indicator {
    background: var(--color-primary-green);
}

.tree-label:hover .tree-indicator,
.tree-leaf:hover .tree-indicator {
    transform: scale(1.33);
}

/* Expand triangle for details */
.tree-node > .tree-label::before {
    content: '';
    display: inline-block;
    width: 0;
    height: 0;
    border-left: 5px solid var(--color-slate);
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    transition: transform 0.2s;
    flex-shrink: 0;
    margin-right: -2px;
}

.tree-node[open] > .tree-label::before {
    transform: rotate(90deg);
}

/* ---- Main Content ---- */
.content {
    grid-area: content;
    padding: 16px 0 60px;
    min-width: 0;
}

/* Breadcrumb */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-heading);
    font-size: 0.82rem;
    color: var(--color-slate);
    padding-bottom: 16px;
    margin-bottom: 8px;
}

.breadcrumb-sep {
    color: #9CA3AF;
    font-size: 0.7rem;
}

.breadcrumb-item {
    cursor: pointer;
    transition: color 0.2s;
}

.breadcrumb-item:hover {
    color: var(--color-primary-green);
}

.breadcrumb-item.active {
    color: var(--color-charcoal);
    font-weight: 600;
}

/* Section headings with bookmark tab */
.section-heading {
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.01em;
    line-height: 1.3;
    color: var(--color-charcoal);
    position: relative;
    padding-left: 16px;
    margin-bottom: 16px;
}

h1.section-heading {
    font-size: clamp(1.8rem, 2.5vw, 2.4rem);
    margin-top: 8px;
}

h2.section-heading {
    font-size: clamp(1.3rem, 2vw, 1.7rem);
    margin-top: 8px;
}

h3.section-heading {
    font-size: clamp(1.1rem, 1.5vw, 1.3rem);
    margin-top: 8px;
}

h3.section-heading.sub-h3 {
    font-size: clamp(1rem, 1.3vw, 1.15rem);
    color: var(--color-slate);
}

.section-heading::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.15em;
    bottom: 0.15em;
    width: 4px;
    background: var(--color-primary-green);
    border-radius: 2px;
}

/* Last edited */
.last-edited {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-heading);
    font-size: 0.8rem;
    color: var(--color-slate);
    margin-bottom: 20px;
}

.edit-icon {
    flex-shrink: 0;
}

/* Wiki Sections */
.wiki-section {
    margin-bottom: 12px;
}

.wiki-subsection {
    margin-top: 28px;
    margin-bottom: 20px;
}

/* Paragraphs */
.content p {
    margin-bottom: 1.2em;
    max-width: 72ch;
}

/* Wiki links */
.wiki-link {
    color: var(--color-primary-green);
    text-decoration: none;
    border-bottom: 1px dashed var(--color-primary-green);
    transition: background 0.2s, border-color 0.2s;
    padding: 0 2px;
}

.wiki-link:hover {
    background: var(--color-leaf-light);
    border-bottom-style: solid;
}

/* External links (not used much in this page but defined) */
a.external-link {
    color: var(--color-reference-blue);
    text-decoration: underline;
    text-decoration-style: solid;
}

/* Code inline */
code {
    font-family: var(--font-code);
    font-size: 0.9em;
    background: var(--color-code-bg);
    border-radius: 3px;
    padding: 0.15em 0.4em;
    color: var(--color-charcoal);
}

/* Lists */
.wiki-list {
    padding-left: 24px;
    margin-bottom: 1.2em;
    max-width: 72ch;
}

.wiki-list li {
    margin-bottom: 0.5em;
    padding-left: 4px;
}

.wiki-list li::marker {
    color: var(--color-primary-green);
}

/* Blockquote */
.wiki-quote {
    border-left: 3px solid var(--color-primary-green);
    padding: 16px 20px;
    margin: 20px 0;
    background: var(--color-soft-moss);
    border-radius: 0 6px 6px 0;
    font-style: italic;
    max-width: 72ch;
}

.wiki-quote cite {
    display: block;
    margin-top: 8px;
    font-size: 0.85rem;
    font-style: normal;
    color: var(--color-slate);
    font-family: var(--font-heading);
}

/* Strong */
strong {
    font-weight: 400;
    color: var(--color-charcoal);
}

/* Section Dividers */
.section-divider {
    display: flex;
    justify-content: center;
    padding: 20px 0;
}

/* ---- Diagrams ---- */
.diagram-container {
    margin: 28px 0;
    padding: 20px;
    background: rgba(250, 253, 248, 0.7);
    border: 1px solid var(--color-fern-gray);
    border-radius: 8px;
    overflow: hidden;
}

.flow-diagram,
.bullwhip-diagram,
.network-diagram {
    display: block;
    width: 100%;
    height: auto;
}

/* Node labels */
.node-label {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.65rem;
    fill: var(--color-charcoal);
    text-anchor: middle;
    letter-spacing: 0.06em;
}

.node-sublabel {
    font-family: var(--font-heading);
    font-weight: 400;
    font-size: 0.55rem;
    fill: var(--color-slate);
    text-anchor: middle;
}

.hub-label {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.7rem;
    fill: var(--color-charcoal);
    text-anchor: middle;
    letter-spacing: 0.04em;
}

.variance-label {
    font-family: var(--font-heading);
    font-weight: 400;
    font-size: 0.55rem;
    fill: var(--color-slate);
    text-anchor: middle;
}

.info-flow-label {
    font-family: var(--font-heading);
    font-weight: 400;
    font-size: 0.55rem;
    fill: var(--color-reference-blue);
    text-anchor: middle;
}

.diagram-caption {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-heading);
    font-size: 0.78rem;
    color: var(--color-slate);
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px solid var(--color-fern-gray);
}

/* Diagram node hover tooltips */
.diagram-node {
    cursor: pointer;
}

.diagram-node rect {
    transition: stroke-width 0.2s, filter 0.2s;
}

.diagram-node:hover rect {
    stroke-width: 2.5;
    filter: drop-shadow(0 2px 4px rgba(45, 138, 78, 0.15));
}

/* Flow path animation */
.flow-path {
    stroke-dasharray: 100;
    stroke-dashoffset: 100;
    animation: drawPath 1.2s ease-out forwards;
}

@keyframes drawPath {
    to {
        stroke-dashoffset: 0;
    }
}

/* Bullwhip wave animation */
.bullwhip-wave {
    animation: drawBullwhip 2s ease-out forwards;
    animation-delay: 0.5s;
}

@keyframes drawBullwhip {
    to {
        stroke-dashoffset: 0;
    }
}

/* Traveling dots */
.traveling-dot {
    filter: drop-shadow(0 0 2px rgba(45, 138, 78, 0.3));
}

/* ---- Timeline Table ---- */
.timeline-table {
    margin: 20px 0;
    max-width: 72ch;
}

.timeline-row {
    display: flex;
    gap: 16px;
    padding: 12px 0;
    border-bottom: 1px solid var(--color-fern-gray);
}

.timeline-row:last-child {
    border-bottom: none;
}

.timeline-era {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--color-primary-green);
    min-width: 100px;
    flex-shrink: 0;
    padding-top: 2px;
}

.timeline-desc {
    font-size: 0.95em;
}

/* ---- Callout Box ---- */
.callout-box {
    display: flex;
    gap: 12px;
    padding: 16px 20px;
    border-radius: 6px;
    margin: 20px 0;
    max-width: 72ch;
}

.callout-box.warning {
    background: rgba(212, 168, 67, 0.08);
    border: 1px solid rgba(212, 168, 67, 0.3);
}

.callout-icon {
    flex-shrink: 0;
    margin-top: 3px;
}

.callout-content {
    font-size: 0.92em;
}

.callout-content strong {
    font-weight: 700;
    font-family: var(--font-heading);
    color: var(--color-amber);
}

/* ---- Technology Grid ---- */
.tech-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin: 24px 0;
}

.tech-card {
    padding: 20px;
    background: var(--color-soft-moss);
    border: 1px solid var(--color-fern-gray);
    border-radius: 8px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.tech-card:hover {
    border-color: var(--color-primary-green);
    box-shadow: 0 2px 8px rgba(45, 138, 78, 0.08);
}

.tech-card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.tech-card-header h3 {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--color-charcoal);
    margin: 0;
}

.tech-card p {
    font-size: 0.88rem;
    color: var(--color-slate);
    line-height: 1.6;
    margin: 0;
}

/* ---- Right Margin: Annotations ---- */
.margin {
    grid-area: margin;
    position: relative;
    padding: 16px 0;
}

.annotation {
    position: sticky;
    top: calc(var(--top-bar-height) + 20px);
    padding: 14px 16px;
    margin-bottom: 20px;
    background: var(--color-soft-moss);
    border-radius: 6px;
    border: 1px solid var(--color-fern-gray);
    opacity: 0;
    transform: translateX(8px);
    transition: opacity 0.4s, transform 0.4s;
}

.annotation.visible {
    opacity: 1;
    transform: translateX(0);
}

.annotation-header {
    font-family: var(--font-heading);
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-slate);
    margin-bottom: 8px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--color-fern-gray);
}

.annotation-links {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.annotation-links .wiki-link {
    font-size: 0.85rem;
    display: inline-block;
}

.annotation-text {
    font-size: 0.82rem;
    color: var(--color-slate);
    line-height: 1.55;
}

.annotation-stat {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.stat-value {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary-green);
    line-height: 1.2;
}

.stat-label {
    font-family: var(--font-heading);
    font-size: 0.78rem;
    color: var(--color-slate);
    line-height: 1.4;
}

/* ---- Wiki Footer ---- */
.wiki-footer {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 2px solid var(--color-fern-gray);
}

.footer-meta {
    display: flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 12px;
}

.footer-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-heading);
    font-size: 0.82rem;
    color: var(--color-slate);
}

.license-badge {
    font-family: var(--font-heading);
    font-size: 0.72rem;
    font-weight: 600;
    padding: 3px 8px;
    background: var(--color-leaf-light);
    color: var(--color-primary-green);
    border-radius: 4px;
    border: 1px solid var(--color-primary-green);
}

.footer-text {
    font-size: 0.82rem;
    color: var(--color-slate);
    max-width: 60ch;
}

/* ---- Tooltip for diagram nodes ---- */
.node-tooltip {
    position: absolute;
    background: var(--color-charcoal);
    color: var(--color-parchment);
    font-family: var(--font-heading);
    font-size: 0.78rem;
    line-height: 1.4;
    padding: 8px 12px;
    border-radius: 6px;
    max-width: 240px;
    pointer-events: none;
    opacity: 0;
    transform: translateY(-4px);
    transition: opacity 0.2s, transform 0.2s;
    z-index: 50;
}

.node-tooltip.show {
    opacity: 1;
    transform: translateY(0);
}

/* ---- Responsive ---- */
@media (max-width: 1200px) {
    .wiki-layout {
        grid-template-columns: var(--sidebar-width) 1fr;
        grid-template-areas:
            "sidebar content";
    }

    .margin {
        display: none;
    }
}

@media (max-width: 768px) {
    .wiki-layout {
        grid-template-columns: 1fr;
        grid-template-areas: "content";
        padding: 0 16px;
    }

    .sidebar {
        display: none;
    }

    .top-bar-search {
        display: none;
    }

    .top-bar-nav {
        gap: 12px;
    }

    .nav-link {
        font-size: 0.8rem;
    }

    .tech-grid {
        grid-template-columns: 1fr;
    }

    .timeline-row {
        flex-direction: column;
        gap: 4px;
    }

    .timeline-era {
        min-width: unset;
    }
}

/* ---- Diagram scroll-into-view animations ---- */
.diagram-container {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.diagram-container.in-view {
    opacity: 1;
    transform: translateY(0);
}

/* Node appear animation */
.diagram-node rect,
.diagram-node circle,
.hub-node {
    opacity: 0;
    transform-origin: center;
    transition: opacity 0.3s, transform 0.3s;
}

.in-view .diagram-node rect,
.in-view .diagram-node circle,
.in-view .hub-node {
    opacity: 1;
    transform: scale(1);
}

/* Stagger */
.in-view .diagram-node:nth-child(1) rect { transition-delay: 0.1s; }
.in-view .diagram-node:nth-child(2) rect { transition-delay: 0.2s; }
.in-view .diagram-node:nth-child(3) rect { transition-delay: 0.3s; }
.in-view .diagram-node:nth-child(4) rect { transition-delay: 0.4s; }
.in-view .diagram-node:nth-child(5) rect { transition-delay: 0.5s; }

/* Selection highlight for body text */
::selection {
    background: var(--color-leaf-light);
    color: var(--color-charcoal);
}