/* ── PNW MeshCore Regions Explainer ─────────────────────────────────────────── */

:root {
  /* Base palette (inherited from config generator) */
  --green-dark: #1b4332;
  --green: #2d6a4f;
  --green-mid: #40916c;
  --green-light: #74c69d;
  --green-pale: #d8f3dc;
  --blue: #1a3a4a;
  --blue-light: #2a5a6a;
  --gold: #f4c842;
  --gold-warm: #f4a261;
  --red: #e07a5f;
  --red-light: #f4a0a0;
  --bg: #f4f7f5;
  --surface: #ffffff;
  --text: #1a2e25;
  --text-muted: #607a6e;
  --text-light: rgba(255,255,255,0.9);

  /* Hierarchy depth scale */
  --depth-0: #1a3a4a;   /* west */
  --depth-1: #1b4332;   /* pnw */
  --depth-2: #2d6a4f;   /* state */
  --depth-3: #40916c;   /* sub-region */
  --depth-4: #f4c842;   /* metro */
  --depth-cross: #f4a261; /* cross-border */

  /* Layout */
  --max-width: 960px;
  --section-pad: 5rem 1.5rem;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 4px 24px rgba(0,0,0,0.12);

  /* Typography */
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Cascadia Code", "JetBrains Mono", Menlo, monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--green); }
a:hover { color: var(--green-dark); }

/* ── Skip link ─────────────────────────────────────────────────────────────── */

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--green-dark);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  z-index: 100;
  font-size: 0.875rem;
}
.skip-link:focus { top: 1rem; }

/* ── Skip callout ──────────────────────────────────────────────────────────── */

.skip-callout {
  background: var(--surface);
  border-top: 3px solid var(--gold);
  padding: 1.25rem 1.5rem;
}

.skip-callout-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.skip-callout-icon {
  color: var(--gold-warm);
  flex-shrink: 0;
}

.skip-callout-text {
  flex: 1;
  min-width: 200px;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  font-size: 0.95rem;
}

.skip-callout-text strong {
  color: var(--text);
}

.skip-callout-text span {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.skip-callout-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--green-dark);
  color: #fff;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  transition: background 0.2s;
  flex-shrink: 0;
}

.skip-callout-btn:hover {
  background: var(--green);
  color: #fff;
}

/* ── Section containers ────────────────────────────────────────────────────── */

.explainer-section {
  padding: var(--section-pad);
}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-heading {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  color: var(--green-dark);
  margin-bottom: 1rem;
  line-height: 1.25;
}

.section-lead {
  font-size: 1.125rem;
  color: var(--text-muted);
  max-width: 640px;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

/* Alternating section backgrounds */
.explainer-section:nth-child(even) {
  background: var(--surface);
}

/* ── Scroll-fade animation ─────────────────────────────────────────────────── */

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .fade-in { opacity: 1; transform: none; transition: none; }
}

/* ── Hero ──────────────────────────────────────────────────────────────────── */

.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(160deg, var(--green-dark) 0%, var(--blue) 100%);
  color: var(--text-light);
  padding: 2rem 1.5rem;
  position: relative;
  overflow: hidden;
}

.hero-badge {
  display: inline-block;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 20px;
  padding: 0.35rem 1rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.5rem;
}

.hero h1 {
  font-size: clamp(2.2rem, 6vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 1rem;
  width: 100%;
}

.hero-sub {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  opacity: 0.85;
  line-height: 1.6;
  margin-bottom: 2rem;
  width: 100%;
}

/* Radio wave animation */
.hero-waves {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  z-index: 0;
}
.hero-waves .wave {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 100px;
  height: 100px;
  margin: -50px 0 0 -50px;
  border: 1.5px solid rgba(255,255,255,0.08);
  border-radius: 50%;
  animation: wave-expand 6s ease-out infinite;
}
.hero-waves .wave:nth-child(2) { animation-delay: 1.5s; }
.hero-waves .wave:nth-child(3) { animation-delay: 3s; }
.hero-waves .wave:nth-child(4) { animation-delay: 4.5s; }

@keyframes wave-expand {
  0% { transform: scale(1); opacity: 0.6; }
  100% { transform: scale(12); opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .hero-waves .wave { animation: none; opacity: 0.04; transform: scale(3); }
  .hero-waves .wave:nth-child(2) { transform: scale(6); }
  .hero-waves .wave:nth-child(3) { transform: scale(9); }
  .hero-waves .wave:nth-child(4) { transform: scale(12); }
}

.hero-content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 40rem;
  margin-inline: auto;
}

/* Mountain silhouette */
.hero-mountains {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: 0;
}

/* Scroll indicator */
.scroll-hint {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  animation: bounce 2s infinite;
  opacity: 0.6;
}
.scroll-hint svg { width: 28px; height: 28px; }

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

@media (prefers-reduced-motion: reduce) {
  .scroll-hint { animation: none; }
}

/* ── Problem section (without/with panels) ─────────────────────────────────── */

.diagram-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 1rem;
}

.diagram-panel {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  text-align: center;
}

.diagram-panel h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.diagram-panel.panel-bad h3 { color: var(--red); }
.diagram-panel.panel-good h3 { color: var(--green); }

.diagram-panel svg {
  width: 100%;
  max-width: 340px;
  height: auto;
  margin: 0 auto;
  display: block;
}

.diagram-panel figcaption {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
}

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

/* SVG flood line animations */
.flood-line {
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
  animation: draw-line 1.8s ease forwards;
}
.flood-line:nth-child(2) { animation-delay: 0.1s; }
.flood-line:nth-child(3) { animation-delay: 0.2s; }
.flood-line:nth-child(4) { animation-delay: 0.3s; }
.flood-line:nth-child(5) { animation-delay: 0.4s; }
.flood-line:nth-child(6) { animation-delay: 0.5s; }
.flood-line:nth-child(7) { animation-delay: 0.6s; }
.flood-line:nth-child(8) { animation-delay: 0.7s; }
.flood-line:nth-child(9) { animation-delay: 0.8s; }
.flood-line:nth-child(10) { animation-delay: 0.9s; }
.flood-line:nth-child(11) { animation-delay: 1s; }
.flood-line:nth-child(12) { animation-delay: 1.1s; }
.flood-line:nth-child(13) { animation-delay: 1.2s; }
.flood-line:nth-child(14) { animation-delay: 1.3s; }
.flood-line:nth-child(15) { animation-delay: 1.4s; }

@keyframes draw-line {
  to { stroke-dashoffset: 0; }
}

.region-line {
  stroke-dasharray: 200;
  stroke-dashoffset: 200;
  animation: draw-line 1s ease forwards;
  animation-delay: 0.3s;
}

/* Pause animations until visible */
.diagram-panel:not(.animate) .flood-line,
.diagram-panel:not(.animate) .region-line {
  animation-play-state: paused;
  stroke-dashoffset: 200;
}

@media (prefers-reduced-motion: reduce) {
  .flood-line, .region-line {
    animation: none;
    stroke-dashoffset: 0;
  }
}

/* ── Tag badges ────────────────────────────────────────────────────────────── */

.tag-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.3rem 0.7rem;
  border-radius: 6px;
  color: #fff;
  white-space: nowrap;
}
.tag-badge .tag-label {
  font-family: var(--font);
  font-weight: 400;
  font-size: 0.75rem;
  opacity: 0.85;
}

.tag-badge.depth-0 { background: var(--depth-0); }
.tag-badge.depth-1 { background: var(--depth-1); }
.tag-badge.depth-2 { background: var(--depth-2); }
.tag-badge.depth-3 { background: var(--depth-3); }
.tag-badge.depth-4 { background: var(--depth-4); color: var(--text); }
.tag-badge.depth-cross { background: var(--depth-cross); color: var(--text); }

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  margin-bottom: 2rem;
}

.tag-arrow {
  color: var(--text-muted);
  font-size: 1.2rem;
}

/* Analogy callout */
.analogy-box {
  background: var(--green-pale);
  border-left: 4px solid var(--green-mid);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 1rem 1.25rem;
  font-size: 0.95rem;
  color: var(--green-dark);
  max-width: 560px;
}

/* ── Hierarchy tree ────────────────────────────────────────────────────────── */

.tree-container {
  margin: 2rem 0;
  overflow-x: auto;
  padding-bottom: 1rem;
}

.tree-svg {
  display: block;
  margin: 0 auto;
}

.tree-node-group { cursor: pointer; }

.tree-node-rect {
  rx: 6;
  ry: 6;
  stroke: transparent;
  stroke-width: 2;
  transition: stroke 0.2s, filter 0.2s;
}

.tree-node-text {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  fill: #fff;
  text-anchor: middle;
  pointer-events: none;
}

.tree-node-label {
  font-family: var(--font);
  font-size: 10px;
  fill: var(--text-muted);
  pointer-events: none;
}

.tree-edge {
  stroke: #ccc;
  stroke-width: 1.5;
  fill: none;
  transition: stroke 0.2s, stroke-width 0.2s;
}

/* Hover/active states */
.tree-node-group.highlighted .tree-node-rect {
  stroke: var(--gold);
  stroke-width: 2.5;
  filter: drop-shadow(0 0 6px rgba(244,200,66,0.4));
}

.tree-node-group.dimmed {
  opacity: 0.25;
  transition: opacity 0.3s;
}

.tree-edge.highlighted {
  stroke: var(--gold);
  stroke-width: 2.5;
}

.tree-edge.dimmed {
  opacity: 0.15;
}

/* Scope selector */
.scope-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
  align-items: center;
}

.scope-controls label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-right: 0.25rem;
}

.scope-btn {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.4rem 0.9rem;
  border: 2px solid var(--green-light);
  border-radius: 6px;
  background: var(--surface);
  color: var(--green-dark);
  cursor: pointer;
  transition: all 0.2s;
}
.scope-btn:hover { border-color: var(--green); background: var(--green-pale); }
.scope-btn.active {
  background: var(--green-dark);
  color: #fff;
  border-color: var(--green-dark);
}

.scope-caption {
  font-size: 0.95rem;
  color: var(--text-muted);
  min-height: 1.5em;
  margin-top: 0.5rem;
}
.scope-caption code {
  font-family: var(--font-mono);
  background: var(--green-pale);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.85em;
}

/* ── Corridor flow demo ────────────────────────────────────────────────────── */

.corridor-container {
  margin: 2rem 0;
  overflow-x: auto;
}

.corridor-svg {
  display: block;
  margin: 0 auto;
}

.corridor-node-circle {
  transition: fill 0.3s, r 0.3s;
}

.corridor-node-label {
  font-family: var(--font);
  font-size: 11px;
  fill: var(--text);
  text-anchor: middle;
}

.corridor-tag {
  font-family: var(--font-mono);
  font-size: 9px;
  fill: var(--text-muted);
  text-anchor: middle;
}

.corridor-link {
  stroke: #ddd;
  stroke-width: 2;
  transition: stroke 0.3s;
}

.corridor-link.active { stroke: var(--green-light); stroke-width: 3; }

.corridor-node-circle.active {
  fill: var(--green);
  r: 18;
}

.corridor-node-circle.stopped {
  fill: var(--red);
  r: 18;
}

.corridor-node-circle.inactive {
  fill: #ddd;
}

.corridor-status {
  font-family: var(--font);
  font-size: 10px;
  font-weight: 700;
  text-anchor: middle;
  opacity: 0;
  transition: opacity 0.3s;
}
.corridor-status.show { opacity: 1; }
.corridor-status.forward { fill: var(--green-dark); }
.corridor-status.stops { fill: var(--red); }

/* Pulse */
.corridor-pulse {
  fill: var(--gold);
  opacity: 0;
  transition: none;
}
.corridor-pulse.animating {
  opacity: 1;
}

@media (prefers-reduced-motion: reduce) {
  .corridor-pulse { display: none; }
}

/* ── Benefit cards ─────────────────────────────────────────────────────────── */

.benefits-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-top: 1rem;
}

.benefit-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.75rem;
  border: 1px solid rgba(0,0,0,0.05);
}

.benefit-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 1rem;
}
.benefit-icon svg { width: 100%; height: 100%; }

.benefit-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--green-dark);
  margin-bottom: 0.5rem;
}

.benefit-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

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

/* ── Cross-border diagrams ─────────────────────────────────────────────────── */

.cross-border-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  margin-top: 1.5rem;
}

.cross-border-diagram {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  text-align: center;
}

.cross-border-diagram h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--green-dark);
  margin-bottom: 1rem;
}

.cross-border-diagram svg {
  width: 100%;
  max-width: 320px;
  margin: 0 auto;
  display: block;
}

.cross-border-diagram figcaption {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 1rem;
  line-height: 1.5;
}

@media (max-width: 640px) {
  .cross-border-pair { grid-template-columns: 1fr; }
}

/* ── CTA cards ─────────────────────────────────────────────────────────────── */

.cta-section {
  background: linear-gradient(160deg, var(--green-dark) 0%, var(--blue) 100%) !important;
  color: var(--text-light);
}
.cta-section .section-heading { color: #fff; }
.cta-section .section-lead { color: rgba(255,255,255,0.75); }

.cta-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.cta-card {
  display: block;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: var(--radius);
  padding: 1.75rem;
  text-decoration: none;
  color: var(--text-light);
  transition: background 0.2s, transform 0.2s;
}
.cta-card:hover {
  background: rgba(255,255,255,0.14);
  transform: translateY(-2px);
  color: #fff;
}

.cta-icon {
  width: 40px;
  height: 40px;
  margin-bottom: 1rem;
}
.cta-icon svg { width: 100%; height: 100%; stroke: var(--green-light); fill: none; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }

.cta-card strong {
  display: block;
  font-size: 1.05rem;
  margin-bottom: 0.4rem;
}

.cta-card p {
  font-size: 0.9rem;
  opacity: 0.75;
  line-height: 1.5;
}

@media (max-width: 768px) {
  .cta-cards { grid-template-columns: 1fr; }
}

/* ── Footer ────────────────────────────────────────────────────────────────── */

.explainer-footer {
  text-align: center;
  padding: 2rem 1.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  background: var(--bg);
}
.explainer-footer a { color: var(--green); }

/* ── App walkthrough ───────────────────────────────────────────────────────── */

.walkthrough {
  display: flex;
  flex-direction: column;
  gap: 3rem;
  margin: 2rem 0;
}

.walkthrough-step {
  display: grid;
  grid-template-columns: 3rem 1fr auto;
  gap: 1.5rem 2rem;
  align-items: start;
}

.step-number {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: var(--green-dark);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 0.2rem;
}

.step-content h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--green-dark);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}

.step-content p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 0.75rem;
}

.step-content p:last-child { margin-bottom: 0; }

.step-content code {
  font-family: var(--font-mono);
  background: var(--green-pale);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.85em;
  color: var(--green-dark);
}

.step-nav {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.88rem;
  font-weight: 600;
  background: var(--green-pale);
  color: var(--green-dark);
  border-radius: 6px;
  padding: 0.25rem 0.6rem;
  margin: 0 0.1rem;
  white-space: nowrap;
}

.step-nav svg {
  width: 14px;
  height: 14px;
  stroke: var(--green);
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

.app-controls-hint {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.app-controls-hint img {
  height: 28px;
  width: auto;
  border-radius: 6px;
  background: #1a1a1a;
  padding: 2px 4px;
}

.app-controls-hint span {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

.app-controls-img-wrap {
  position: relative;
  display: inline-flex;
  flex-shrink: 0;
}

.ui-key {
  display: inline-block;
  border: 1.5px solid var(--green-mid);
  border-radius: 4px;
  padding: 0.05em 0.35em;
  font-size: 0.95em;
  line-height: 1.3;
  color: var(--green-dark);
  font-weight: 700;
  vertical-align: baseline;
}

.step-screenshots {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  flex-shrink: 0;
}

.phone-screenshot {
  text-align: center;
}

.phone-screenshot img {
  width: 140px;
  height: auto;
  border-radius: 18px;
  box-shadow: 0 0 0 1px rgba(0,0,0,0.08), var(--shadow-lg);
  display: block;
}

.phone-screenshot figcaption {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
  line-height: 1.4;
}

@media (max-width: 860px) {
  .walkthrough-step {
    grid-template-columns: 3rem 1fr;
  }

  .step-screenshots {
    grid-column: 2 / 3;
    justify-content: flex-start;
  }
}

@media (max-width: 560px) {
  .walkthrough-step {
    grid-template-columns: 2.5rem 1fr;
    gap: 1rem 1.25rem;
  }

  .step-number {
    width: 2.5rem;
    height: 2.5rem;
    font-size: 1.05rem;
  }

  .step-screenshots {
    grid-column: 1 / -1;
    justify-content: center;
  }

  .phone-screenshot img { width: 130px; }
}

/* ── Print ─────────────────────────────────────────────────────────────────── */

@media print {
  .hero { min-height: auto; padding: 2rem 1rem; }
  .hero-waves, .scroll-hint { display: none; }
  .fade-in { opacity: 1; transform: none; }
  .scope-controls, .corridor-pulse { display: none; }
  .explainer-section { padding: 2rem 1rem; break-inside: avoid; }
}