/* ==========================================================================
   Whole Life Carbon (WLC) & Embodied Carbon Diagrams & Flowcharts
   Interactive, Responsive & Publication-Grade Visualisations
   Compatible with Gokarna Light & Dark Themes
   ========================================================================== */

:root {
  --wlc-font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --wlc-radius: 12px;
  --wlc-radius-sm: 8px;
  --wlc-radius-pill: 9999px;
  --wlc-transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --wlc-border: var(--border-color, rgba(128, 128, 128, 0.22));
  --wlc-card-bg: var(--surface-color, rgba(255, 255, 255, 0.85));
  --wlc-container-bg: rgba(128, 128, 128, 0.04);
  --wlc-text: var(--text-color, #2c3134);
  --wlc-muted: var(--muted-color, #696e70);

  /* Curated Earthy WLC Stage Color Palette */
  --wlc-stage-a: #de634d;        /* Upfront / Product & Site (Warm Coral/Terracotta) */
  --wlc-stage-a-bg: rgba(222, 99, 77, 0.12);
  --wlc-stage-a-border: rgba(222, 99, 77, 0.35);

  --wlc-stage-trans: #e1a102;    /* Logistics A4 (Golden Amber) */
  --wlc-stage-trans-bg: rgba(225, 161, 2, 0.12);
  --wlc-stage-trans-border: rgba(225, 161, 2, 0.35);

  --wlc-stage-b: #3b827e;        /* In-Use B1-B7 (Sage / Ocean Teal) */
  --wlc-stage-b-bg: rgba(59, 130, 126, 0.12);
  --wlc-stage-b-border: rgba(59, 130, 126, 0.35);

  --wlc-stage-c: #ab613c;        /* End of Life C1-C4 (Rust / Crimson) */
  --wlc-stage-c-bg: rgba(171, 97, 60, 0.12);
  --wlc-stage-c-border: rgba(171, 97, 60, 0.35);

  --wlc-stage-d: #10b981;        /* Circularity Module D (Emerald Green) */
  --wlc-stage-d-bg: rgba(16, 185, 129, 0.12);
  --wlc-stage-d-border: rgba(16, 185, 129, 0.38);

  --wlc-stage-flow: #6366f1;      /* Process / Engineering Flow (Indigo) */
  --wlc-stage-flow-bg: rgba(99, 102, 241, 0.12);
  --wlc-stage-flow-border: rgba(99, 102, 241, 0.35);
}

/* Ensure universal box-sizing within all WLC containers */
.wlc-diagram-box,
.wlc-diagram-box *,
.wlc-diagram-box *::before,
.wlc-diagram-box *::after {
  box-sizing: border-box;
}

/* Base Diagram Container */
.wlc-diagram-box {
  margin: 2.2rem 0;
  padding: 1.35rem;
  background: var(--wlc-container-bg);
  border: 1px solid var(--wlc-border);
  border-radius: var(--wlc-radius);
  font-family: var(--wlc-font);
  color: var(--wlc-text);
  box-shadow: 0 8px 24px -6px rgba(0, 0, 0, 0.05);
  position: relative;
  width: 100%;
  max-width: 100%;
  overflow: visible;
}

.wlc-diagram-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 1.4rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--wlc-border);
}

.wlc-diagram-header-left h4 {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.wlc-diagram-header-left p {
  margin: 0.25rem 0 0;
  font-size: 0.88rem;
  color: var(--wlc-muted);
}

.wlc-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--wlc-radius-pill);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  background: var(--wlc-card-bg);
  border: 1px solid var(--wlc-border);
  color: var(--wlc-muted);
}

.wlc-tag.live {
  background: rgba(16, 185, 129, 0.12);
  color: #10b981;
  border-color: rgba(16, 185, 129, 0.3);
}

/* Toolbar & Filters */
.wlc-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1.4rem;
}

.wlc-filter-btn {
  background: var(--wlc-card-bg);
  border: 1px solid var(--wlc-border);
  color: var(--wlc-text);
  padding: 0.45rem 0.85rem;
  border-radius: var(--wlc-radius-sm);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--wlc-transition);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.wlc-filter-btn:hover {
  border-color: var(--wlc-stage-a);
  transform: translateY(-1px);
}

.wlc-filter-btn.active {
  background: var(--wlc-stage-a);
  color: #ffffff;
  border-color: var(--wlc-stage-a);
  box-shadow: 0 4px 10px rgba(222, 99, 77, 0.3);
}

/* Interactive Card Nodes */
.wlc-node {
  background: var(--wlc-card-bg);
  border: 1px solid var(--wlc-border);
  border-radius: var(--wlc-radius-sm);
  padding: 0.95rem;
  cursor: pointer;
  transition: var(--wlc-transition);
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-width: 0;
  width: 100%;
  max-width: 100%;
  overflow-wrap: break-word;
  word-break: normal;
}

.wlc-node:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px -2px rgba(0, 0, 0, 0.09);
  border-color: currentColor;
}

.wlc-node.active {
  box-shadow: 0 0 0 2px currentColor;
  transform: translateY(-2px);
}

.wlc-node-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.4rem;
  min-width: 0;
  max-width: 100%;
}

.wlc-node-code {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
}

.wlc-node-title {
  font-size: 0.95rem;
  font-weight: 600;
  margin: 0.2rem 0;
  line-height: 1.35;
  min-width: 0;
  overflow-wrap: break-word;
}

.wlc-node-sub {
  font-size: 0.8rem;
  color: var(--wlc-muted);
  line-height: 1.4;
  margin: 0;
  min-width: 0;
  overflow-wrap: break-word;
}

.wlc-node-badge {
  font-size: 0.72rem;
  font-weight: 600;
  margin-top: 0.6rem;
  padding: 0.2rem 0.5rem;
  border-radius: var(--wlc-radius-pill);
  align-self: flex-start;
}

/* Node Color Schemes */
.wlc-node.stage-a {
  border-left: 4px solid var(--wlc-stage-a);
}
.wlc-node.stage-a .wlc-node-code {
  background: var(--wlc-stage-a-bg);
  color: var(--wlc-stage-a);
}
.wlc-node.stage-a .wlc-node-badge {
  background: var(--wlc-stage-a-bg);
  color: var(--wlc-stage-a);
}

.wlc-node.stage-trans {
  border-left: 4px solid var(--wlc-stage-trans);
}
.wlc-node.stage-trans .wlc-node-code {
  background: var(--wlc-stage-trans-bg);
  color: var(--wlc-stage-trans);
}
.wlc-node.stage-trans .wlc-node-badge {
  background: var(--wlc-stage-trans-bg);
  color: var(--wlc-stage-trans);
}

.wlc-node.stage-b {
  border-left: 4px solid var(--wlc-stage-b);
}
.wlc-node.stage-b .wlc-node-code {
  background: var(--wlc-stage-b-bg);
  color: var(--wlc-stage-b);
}
.wlc-node.stage-b .wlc-node-badge {
  background: var(--wlc-stage-b-bg);
  color: var(--wlc-stage-b);
}

.wlc-node.stage-c {
  border-left: 4px solid var(--wlc-stage-c);
}
.wlc-node.stage-c .wlc-node-code {
  background: var(--wlc-stage-c-bg);
  color: var(--wlc-stage-c);
}
.wlc-node.stage-c .wlc-node-badge {
  background: var(--wlc-stage-c-bg);
  color: var(--wlc-stage-c);
}

.wlc-node.stage-d {
  border-left: 4px solid var(--wlc-stage-d);
  border-style: dashed;
}
.wlc-node.stage-d .wlc-node-code {
  background: var(--wlc-stage-d-bg);
  color: var(--wlc-stage-d);
}
.wlc-node.stage-d .wlc-node-badge {
  background: var(--wlc-stage-d-bg);
  color: var(--wlc-stage-d);
}

.wlc-node.stage-flow {
  border-left: 4px solid var(--wlc-stage-flow);
}
.wlc-node.stage-flow .wlc-node-code {
  background: var(--wlc-stage-flow-bg);
  color: var(--wlc-stage-flow);
}
.wlc-node.stage-flow .wlc-node-badge {
  background: var(--wlc-stage-flow-bg);
  color: var(--wlc-stage-flow);
}

/* Connecting Flow Arrows */
.wlc-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--wlc-muted);
  opacity: 0.6;
  font-size: 1.2rem;
  user-select: none;
}

/* Detail Inspector Drawer */
.wlc-inspector {
  padding: 1.15rem 1.25rem;
  background: var(--wlc-card-bg);
  border: 1px solid var(--wlc-border);
  border-left: 4px solid var(--wlc-stage-a);
  border-radius: var(--wlc-radius);
  box-shadow: 0 8px 24px -4px rgba(0, 0, 0, 0.1);
  transition: var(--wlc-transition);
  animation: wlcFadeIn 0.3s ease;
  min-width: 0;
  width: 100%;
  max-width: 100%;
  overflow-wrap: break-word;
}

@keyframes wlcFadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.wlc-ins-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.65rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px dashed var(--wlc-border);
}

.wlc-ins-pill {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--wlc-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.wlc-live-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.25);
  display: inline-block;
}

.wlc-ins-close-btn {
  background: transparent;
  border: none;
  color: var(--wlc-muted);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  padding: 0.15rem 0.35rem;
  border-radius: 4px;
  transition: var(--wlc-transition);
}

.wlc-ins-close-btn:hover {
  color: var(--wlc-text);
  background: var(--wlc-container-bg);
}

.wlc-inspector h5 {
  margin: 0 0 0.4rem;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.35;
}

.wlc-inspector p {
  margin: 0.3rem 0 0.75rem;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--wlc-text);
}

.wlc-inspector-meta {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.8rem;
  padding-top: 0.65rem;
  border-top: 1px dashed var(--wlc-border);
  font-size: 0.8rem;
  width: 100%;
}

.wlc-ins-meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  background: var(--wlc-container-bg);
  border: 1px solid var(--wlc-border);
  border-radius: var(--wlc-radius-sm);
  padding: 0.45rem 0.65rem;
}

.wlc-meta-label {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--wlc-muted);
}

.wlc-ins-meta-item span:not(.wlc-meta-label) {
  font-size: 0.82rem;
  color: var(--wlc-text);
  word-break: normal;
  overflow-wrap: break-word;
}

/* ==========================================================================
   FLOWCHART 0: Course Roadmap (Lesson 00)
   ========================================================================== */
.wlc-roadmap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  margin: 1.2rem 0;
}

.wlc-roadmap-card {
  background: var(--wlc-card-bg);
  border: 1px solid var(--wlc-border);
  border-radius: var(--wlc-radius-sm);
  padding: 1.1rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--wlc-transition);
  text-decoration: none;
  color: inherit;
}

.wlc-roadmap-card:hover {
  transform: translateY(-3px);
  border-color: var(--wlc-stage-a);
  box-shadow: 0 8px 20px -4px rgba(0, 0, 0, 0.08);
}

.wlc-roadmap-card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.6rem;
}

.wlc-step-pill {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.55rem;
  border-radius: var(--wlc-radius-pill);
  background: var(--wlc-stage-a-bg);
  color: var(--wlc-stage-a);
}

.wlc-roadmap-card h5 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.35;
}

.wlc-roadmap-card p {
  font-size: 0.82rem;
  color: var(--wlc-muted);
  margin: 0 0 0.8rem;
  line-height: 1.45;
}

.wlc-card-action {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--wlc-stage-a);
  display: flex;
  align-items: center;
  gap: 0.3rem;
  margin-top: auto;
}

/* ==========================================================================
   FLOWCHART 1: Modular Lifecycle Boundary Matrix (Lesson 01)
   Vertical Chronological Order with Floating Side Inspector
   ========================================================================== */
.wlc-split-layout {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 1.15rem;
  align-items: flex-start;
  width: 100%;
  max-width: 100%;
  position: relative;
  margin: 1.2rem 0;
}

@media (max-width: 768px) {
  .wlc-split-layout {
    display: block;
    margin: 1rem 0;
  }
}

.wlc-timeline-col {
  min-width: 0;
  width: 100%;
}

.wlc-inspector-col {
  min-width: 0;
  position: -webkit-sticky;
  position: sticky;
  top: 75px;
  align-self: start;
  z-index: 10;
}

@media (min-width: 769px) {
  .wlc-ins-close-btn {
    display: none;
  }
  .wlc-inspector-col .wlc-inspector {
    max-height: calc(100vh - 100px);
    overflow-y: auto;
  }
}

@media (max-width: 768px) {
  .wlc-inspector-col {
    position: fixed;
    bottom: 14px;
    left: 14px;
    right: 14px;
    top: auto;
    z-index: 1000;
    display: none;
  }
  .wlc-inspector-col.mobile-visible {
    display: block;
    animation: wlcSlideUp 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  }
  .wlc-inspector-col .wlc-inspector {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
    max-height: 60vh;
    overflow-y: auto;
  }
  .wlc-ins-close-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    font-size: 1.35rem;
  }
}

@keyframes wlcSlideUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

.wlc-stage-lanes {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  width: 100%;
  max-width: 100%;
}

.wlc-lane {
  background: var(--wlc-container-bg);
  border: 1px solid var(--wlc-border);
  border-radius: var(--wlc-radius-sm);
  padding: 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: var(--wlc-transition);
  min-width: 0;
  width: 100%;
  max-width: 100%;
}

.wlc-lane-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-bottom: 0.55rem;
  border-bottom: 2px solid;
  margin-bottom: 0.25rem;
}

.wlc-lane-title {
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  min-width: 0;
  margin: 0;
  overflow-wrap: break-word;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.wlc-lane-pill {
  font-size: 0.74rem;
  font-weight: 600;
  padding: 0.18rem 0.55rem;
  border-radius: var(--wlc-radius-pill);
  background: var(--wlc-card-bg);
  border: 1px solid var(--wlc-border);
  color: var(--wlc-muted);
}

.wlc-lane.lane-a .wlc-lane-header { border-color: var(--wlc-stage-a); }
.wlc-lane.lane-a .wlc-lane-title { color: var(--wlc-stage-a); }
.wlc-lane.lane-upfront .wlc-lane-header { border-color: var(--wlc-stage-trans); }
.wlc-lane.lane-upfront .wlc-lane-title { color: var(--wlc-stage-trans); }
.wlc-lane.lane-b .wlc-lane-header { border-color: var(--wlc-stage-b); }
.wlc-lane.lane-b .wlc-lane-title { color: var(--wlc-stage-b); }
.wlc-lane.lane-c .wlc-lane-header { border-color: var(--wlc-stage-c); }
.wlc-lane.lane-c .wlc-lane-title { color: var(--wlc-stage-c); }
.wlc-lane.lane-d .wlc-lane-header { border-color: var(--wlc-stage-d); }
.wlc-lane.lane-d .wlc-lane-title { color: var(--wlc-stage-d); }

.wlc-lane.lane-d {
  border-style: dashed;
  border-color: var(--wlc-stage-d-border);
  background: var(--wlc-stage-d-bg);
}

.wlc-lane.dimmed {
  opacity: 0.25;
  filter: grayscale(80%);
}

.wlc-lane.highlighted {
  box-shadow: 0 0 0 2px var(--wlc-stage-a);
}

.wlc-lane.lane-d.highlighted {
  box-shadow: 0 0 0 2px var(--wlc-stage-d);
}

/* Vertical Chronological Milestone Dividers */
.wlc-milestone-marker {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
  margin: 0.25rem 0;
  color: var(--wlc-muted);
  user-select: none;
  transition: var(--wlc-transition);
  width: 100%;
}

.wlc-milestone-marker.dimmed {
  opacity: 0.25;
}

.wlc-milestone-line {
  flex: 1;
  height: 1px;
  background: var(--wlc-border);
}

.wlc-milestone-pill {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  padding: 0.28rem 0.85rem;
  border-radius: var(--wlc-radius-pill);
  background: var(--wlc-card-bg);
  border: 1px solid var(--wlc-border);
  color: var(--wlc-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  white-space: nowrap;
}

.wlc-milestone-marker.upfront-cutoff .wlc-milestone-pill {
  border-color: var(--wlc-stage-trans);
  color: var(--wlc-stage-trans);
  background: var(--wlc-stage-trans-bg);
}

.wlc-milestone-marker.threshold-cutoff .wlc-milestone-pill {
  border-color: var(--wlc-stage-d);
  color: var(--wlc-stage-d);
  background: var(--wlc-stage-d-bg);
  border-style: dashed;
}

/* Vertical Node Sequence inside Lanes */
.wlc-lane-seq {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  width: 100%;
}

.wlc-v-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--wlc-muted);
  opacity: 0.55;
  height: 14px;
}

.wlc-node.v-node {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  padding: 0.8rem 0.95rem;
}

.wlc-node-main {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  min-width: 0;
  flex: 1 1 200px;
}

.wlc-node-details {
  min-width: 0;
  flex: 1;
}

.wlc-node.v-node .wlc-node-title {
  margin: 0;
  font-size: 0.95rem;
}

.wlc-node.v-node .wlc-node-sub {
  margin: 0.15rem 0 0;
  font-size: 0.8rem;
}

.wlc-node.v-node .wlc-node-badge {
  margin: 0;
  flex-shrink: 0;
}

@media (max-width: 640px) {
  .wlc-node.v-node {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
  .wlc-node.v-node .wlc-node-badge {
    align-self: flex-start;
  }
  .wlc-milestone-pill {
    white-space: normal;
    text-align: center;
  }
}

/* ==========================================================================
   FLOWCHART 2: Upfront Industrial Supply Chain (Lesson 02)
   ========================================================================== */
.wlc-dual-stream-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0.95rem;
  margin: 0;
  width: 100%;
  max-width: 100%;
}

.wlc-streams-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  width: 100%;
  max-width: 100%;
}

@media (max-width: 640px) {
  .wlc-streams-grid {
    grid-template-columns: 1fr;
  }
}

.wlc-stream-col {
  background: var(--wlc-card-bg);
  border: 1px solid var(--wlc-border);
  border-radius: var(--wlc-radius-sm);
  padding: 0.85rem 0.75rem;
  min-width: 0;
  width: 100%;
  max-width: 100%;
}

.wlc-stream-col-title {
  font-size: 0.84rem;
  font-weight: 700;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.3rem;
  margin-bottom: 0.7rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--wlc-border);
  min-width: 0;
  overflow-wrap: break-word;
  line-height: 1.35;
}

.wlc-stream-nodes {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  width: 100%;
}

.wlc-stream-nodes .wlc-node {
  padding: 0.75rem 0.65rem;
}

.wlc-stream-nodes .wlc-node .wlc-node-title {
  font-size: 0.86rem;
}

.wlc-stream-nodes .wlc-node .wlc-node-sub {
  font-size: 0.76rem;
}

.wlc-convergence-gate {
  background: var(--wlc-card-bg);
  border: 2px dashed var(--wlc-stage-a);
  border-radius: var(--wlc-radius-sm);
  padding: 0.95rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  width: 100%;
  max-width: 100%;
  transition: var(--wlc-transition);
}

.wlc-convergence-gate .wlc-node {
  padding: 0.8rem 0.85rem;
}

/* ==========================================================================
   FLOWCHART 3: 60-Year Whole Life Carbon Progression Timeline (Lesson 03)
   ========================================================================== */
.wlc-timeline-container {
  margin: 1.5rem 0;
  width: 100%;
  max-width: 100%;
}

.wlc-timeline-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 86px), 1fr));
  gap: 0.45rem;
  margin-bottom: 1.4rem;
  width: 100%;
  max-width: 100%;
}

@media (max-width: 820px) {
  .wlc-timeline-steps {
    grid-template-columns: repeat(4, 1fr);
  }
}
@media (max-width: 480px) {
  .wlc-timeline-steps {
    grid-template-columns: repeat(2, 1fr);
  }
}

.wlc-time-btn {
  background: var(--wlc-card-bg);
  border: 1px solid var(--wlc-border);
  border-radius: var(--wlc-radius-sm);
  padding: 0.75rem 0.5rem;
  text-align: center;
  cursor: pointer;
  transition: var(--wlc-transition);
  min-width: 0;
  width: 100%;
}

.wlc-time-btn:hover {
  transform: translateY(-2px);
  border-color: var(--wlc-stage-b);
}

.wlc-time-btn.active {
  background: var(--wlc-stage-b);
  color: #ffffff;
  border-color: var(--wlc-stage-b);
  box-shadow: 0 4px 12px rgba(59, 130, 126, 0.35);
}

.wlc-time-btn .yr {
  font-size: 0.95rem;
  font-weight: 700;
  display: block;
}

.wlc-time-btn .inc {
  font-size: 0.75rem;
  opacity: 0.85;
  margin-top: 0.2rem;
  display: block;
}

.wlc-progress-box {
  background: var(--wlc-card-bg);
  border: 1px solid var(--wlc-border);
  border-radius: var(--wlc-radius-sm);
  padding: 1.2rem;
  margin-bottom: 1.2rem;
}

.wlc-progress-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.6rem;
}

.wlc-progress-header strong {
  font-size: 1.05rem;
}

.wlc-progress-val {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--wlc-stage-a);
  font-feature-settings: "tnum";
}

.wlc-meter-track {
  width: 100%;
  height: 18px;
  background: var(--wlc-container-bg);
  border-radius: var(--wlc-radius-pill);
  overflow: hidden;
  border: 1px solid var(--wlc-border);
  display: flex;
}

.wlc-meter-fill {
  height: 100%;
  transition: width 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  background: linear-gradient(90deg, #de634d, #e1a102, #3b827e);
}

/* ==========================================================================
   FLOWCHART 4: End-of-Waste & Circular Economy Loop (Lesson 04)
   ========================================================================== */
.wlc-circular-layout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr));
  gap: 1.2rem;
  margin: 1.2rem 0;
  width: 100%;
  max-width: 100%;
}

.wlc-circular-col {
  min-width: 0;
  width: 100%;
  max-width: 100%;
}

.wlc-boundary-divider {
  position: relative;
  border-left: 2px dashed var(--wlc-stage-d);
  padding-left: 1.2rem;
  min-width: 0;
  width: 100%;
}

.wlc-threshold-banner {
  background: var(--wlc-stage-d-bg);
  border: 1px solid var(--wlc-stage-d-border);
  color: var(--wlc-stage-d);
  font-weight: 700;
  font-size: 0.82rem;
  padding: 0.45rem 0.85rem;
  border-radius: var(--wlc-radius-pill);
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.8rem;
  max-width: 100%;
}

.wlc-circular-loop-callout {
  margin-top: 1rem;
  padding: 0.9rem;
  background: rgba(16, 185, 129, 0.08);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--wlc-radius-sm);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  max-width: 100%;
}

.wlc-circular-loop-callout svg {
  flex-shrink: 0;
  color: var(--wlc-stage-d);
}

/* ==========================================================================
   FLOWCHART 5: 4-Stage LCA Calculation Pipeline (Lesson 05)
   ========================================================================== */
.wlc-pipeline-track {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr));
  gap: 0.85rem;
  margin: 1.2rem 0;
  width: 100%;
  max-width: 100%;
}

@media (max-width: 700px) {
  .wlc-pipeline-track {
    grid-template-columns: 1fr;
  }
}

.wlc-pipe-step {
  background: var(--wlc-card-bg);
  border: 1px solid var(--wlc-border);
  border-radius: var(--wlc-radius-sm);
  padding: 1.1rem;
  display: flex;
  flex-direction: column;
  transition: var(--wlc-transition);
  cursor: pointer;
  position: relative;
  min-width: 0;
  width: 100%;
  max-width: 100%;
}

.wlc-pipe-step:hover {
  transform: translateY(-2px);
  border-color: var(--wlc-stage-flow);
}

.wlc-pipe-step.active {
  box-shadow: 0 0 0 2px var(--wlc-stage-flow);
}

.wlc-step-num {
  font-size: 0.75rem;
  font-weight: 800;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--wlc-stage-flow-bg);
  color: var(--wlc-stage-flow);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.6rem;
}

.wlc-pipe-step h5 {
  margin: 0 0 0.35rem;
  font-size: 0.95rem;
  font-weight: 700;
}

.wlc-pipe-step p {
  margin: 0;
  font-size: 0.82rem;
  color: var(--wlc-muted);
  line-height: 1.45;
}

.wlc-pipe-badge {
  margin-top: 0.8rem;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--wlc-radius-pill);
  background: var(--wlc-container-bg);
  align-self: flex-start;
  color: var(--wlc-muted);
}

/* ==========================================================================
   Mermaid Fallback & Toggle Style
   ========================================================================== */
.wlc-mermaid-toggle {
  margin-top: 1.5rem;
  border: 1px dashed var(--wlc-border);
  border-radius: var(--wlc-radius-sm);
  padding: 0.6rem 0.9rem;
  background: rgba(128, 128, 128, 0.02);
}

.wlc-mermaid-toggle summary {
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--wlc-muted);
  outline: none;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  user-select: none;
}

.wlc-mermaid-toggle summary:hover {
  color: var(--wlc-text);
}

.wlc-mermaid-wrapper {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--wlc-card-bg);
  border: 1px solid var(--wlc-border);
  border-radius: var(--wlc-radius-sm);
  overflow-x: auto;
  text-align: center;
}

.wlc-mermaid-wrapper svg {
  max-width: 100%;
  height: auto;
}