*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{background:#0F172A;color:#E2E8F0;font-family:'DM Sans',sans-serif;min-height:100vh;overflow-x:hidden}
:root{
  --blue:#3B82F6;--blue-dim:#1D4ED8;--blue-glow:rgba(59,130,246,0.15);
  --surface:#1E293B;--surface2:#263244;
  --border:rgba(148,163,184,0.12);--muted:#64748B;--text:#E2E8F0;
  --mono:'IBM Plex Mono',monospace;
}

/* NAV */
nav{position:fixed;top:0;left:0;right:0;z-index:100;padding:1rem 2.5rem;display:flex;justify-content:space-between;align-items:center;background:rgba(15,23,42,0.88);backdrop-filter:blur(14px);border-bottom:1px solid var(--border)}
.nav-links{display:flex;gap:2rem;margin:0 auto}
.nav-links a{color:var(--muted);text-decoration:none;font-size:0.85rem;font-family:var(--mono);transition:color 0.2s;cursor:pointer;white-space:nowrap}
.nav-links a:hover{color:var(--blue)}
.nav-links a.active{color:var(--blue)}

/* PAGE SYSTEM */
.page{display:none}
.page.active{display:block}

/* EMPTY PAGE / HOME HERO CONTAINER */
.empty-page{min-height:100vh;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:1rem;padding:120px 1.5rem 3rem;text-align:center}
.empty-label{font-family:var(--mono);font-size:0.75rem;color:var(--blue);letter-spacing:0.15em;text-transform:uppercase}
.empty-title{font-family:'Syne',sans-serif;font-weight:700;font-size:clamp(1.6rem,5vw,2rem);color:#fff;letter-spacing:-0.02em;text-align:center}
.empty-sub{font-size:0.9rem;color:var(--muted);font-family:var(--mono);text-align:center;max-width:380px;line-height:1.7}

/* HERO */
#hero{min-height:100vh;display:flex;align-items:center;padding:8rem 2.5rem 4rem;position:relative;overflow:hidden}
.hero-bg{position:absolute;top:-200px;right:-200px;width:700px;height:700px;border-radius:50%;background:radial-gradient(circle,rgba(59,130,246,0.06) 0%,transparent 65%);pointer-events:none}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:4rem;align-items:center;max-width:1200px;margin:0 auto;width:100%}
.hero-tag{font-family:var(--mono);font-size:0.75rem;color:var(--blue);letter-spacing:0.1em;text-transform:uppercase;margin-bottom:1.5rem;display:flex;align-items:center;gap:0.75rem}
.hero-tag::before{content:'';display:inline-block;width:24px;height:1px;background:var(--blue)}
.hero-title{font-family:'Syne',sans-serif;font-weight:800;font-size:clamp(2rem,4vw,3.2rem);line-height:1.1;letter-spacing:-0.03em;color:#fff;margin-bottom:1.5rem}
.hero-title em{color:var(--blue);font-style:normal}
.hero-sub{font-size:1rem;line-height:1.75;color:var(--muted);max-width:480px;margin-bottom:2.5rem;font-weight:300}
.hero-btns{display:flex;gap:1rem;flex-wrap:wrap}
.btn-primary{display:inline-flex;align-items:center;gap:0.5rem;padding:0.75rem 1.75rem;background:var(--blue);color:#fff;border:none;border-radius:6px;font-size:0.9rem;font-weight:500;cursor:pointer;text-decoration:none;transition:all 0.2s;font-family:'DM Sans',sans-serif}
.btn-primary:hover{background:#2563EB;transform:translateY(-2px)}
.btn-ghost{display:inline-flex;align-items:center;gap:0.5rem;padding:0.75rem 1.75rem;background:transparent;color:#E2E8F0;border:1px solid var(--border);border-radius:6px;font-size:0.9rem;font-weight:500;cursor:pointer;text-decoration:none;transition:all 0.2s;font-family:'DM Sans',sans-serif}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue)}

/* ABOUT */
#about{padding:6rem 2.5rem;max-width:1200px;margin:0 auto}
.section-label{font-family:var(--mono);font-size:0.7rem;color:var(--blue);letter-spacing:0.15em;text-transform:uppercase;margin-bottom:1rem}
.section-title{font-family:'Syne',sans-serif;font-weight:700;font-size:clamp(1.6rem,3vw,2.4rem);letter-spacing:-0.02em;color:#fff;margin-bottom:2rem}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:4rem;align-items:start}
.about-text{font-size:1.05rem;line-height:1.85;color:#94A3B8;font-weight:300}
.about-text strong{color:#E2E8F0;font-weight:500}
.why-card{background:var(--surface2);border:1px solid var(--border);border-radius:14px;padding:2rem;position:relative;overflow:hidden}
.why-card::before{content:'';position:absolute;top:0;left:0;width:3px;height:100%;background:var(--blue)}
.why-title{font-family:'Syne',sans-serif;font-weight:700;font-size:1.1rem;color:#fff;margin-bottom:1rem;padding-left:0.75rem}
.why-text{font-size:0.9rem;line-height:1.8;color:#94A3B8;font-weight:300}

/* JOURNEY */
#journey-section{background:var(--surface);border-top:1px solid var(--border);border-bottom:1px solid var(--border);padding:6rem 2.5rem;padding-top:8rem}
.journey-inner{max-width:1200px;margin:0 auto}
.node-selector{display:flex;gap:0;margin-bottom:3rem;background:#0F172A;border:1px solid var(--border);border-radius:10px;padding:4px}
.node-btn{flex:1;padding:0.75rem 1rem;background:transparent;border:none;border-radius:7px;color:var(--muted);font-family:'DM Sans',sans-serif;font-size:0.85rem;font-weight:500;cursor:pointer;transition:all 0.25s;display:flex;flex-direction:column;align-items:center;gap:4px}
.node-btn .step-num{font-family:var(--mono);font-size:0.65rem;color:var(--muted);letter-spacing:0.05em}
.node-btn.active{background:var(--blue);color:#fff}
.node-btn.active .step-num{color:rgba(255,255,255,0.7)}
.node-btn:hover:not(.active){background:var(--surface2);color:#E2E8F0}
.journey-content{display:grid;grid-template-columns:1fr 1.4fr;gap:3rem;align-items:start}
.node-meta{display:flex;flex-direction:column;gap:1rem}
.node-badge{display:inline-flex;align-items:center;gap:0.5rem;padding:0.35rem 0.75rem;background:var(--blue-glow);border:1px solid rgba(59,130,246,0.3);border-radius:5px;font-family:var(--mono);font-size:0.7rem;color:var(--blue);letter-spacing:0.05em;width:fit-content}
.node-heading{font-family:'Syne',sans-serif;font-weight:700;font-size:1.8rem;letter-spacing:-0.02em;color:#fff}
.node-desc{font-size:0.95rem;line-height:1.75;color:#94A3B8;font-weight:300}
.node-connector{display:flex;align-items:center;gap:0.75rem;padding:1rem;background:#0F172A;border:1px solid var(--border);border-radius:8px;margin-top:0.5rem}
.connector-icon{width:32px;height:32px;border-radius:6px;background:var(--blue-glow);border:1px solid rgba(59,130,246,0.3);display:flex;align-items:center;justify-content:center;font-size:1rem;flex-shrink:0}
.connector-text{font-size:0.82rem;color:#94A3B8;line-height:1.55}
.connector-text strong{color:var(--blue);font-weight:500}
.node-cards{display:flex;flex-direction:column;gap:1rem}
.info-card{background:#0F172A;border:1px solid var(--border);border-radius:12px;padding:1.25rem 1.5rem}
.info-card-label{font-family:var(--mono);font-size:0.65rem;color:var(--blue);letter-spacing:0.12em;text-transform:uppercase;margin-bottom:0.5rem}
.info-card-title{font-family:'Syne',sans-serif;font-weight:600;font-size:1rem;color:#fff;margin-bottom:0.5rem}
.info-card-text{font-size:0.85rem;line-height:1.7;color:#94A3B8}
.tags{display:flex;flex-wrap:wrap;gap:0.5rem;margin-top:0.75rem}
.tag{padding:0.25rem 0.6rem;background:var(--surface2);border:1px solid var(--border);border-radius:4px;font-family:var(--mono);font-size:0.68rem;color:var(--muted)}

/* FOOTER */
footer{padding:3rem 2.5rem;text-align:center;border-top:1px solid var(--border);background:#0A1020}
.footer-text{font-family:var(--mono);font-size:0.75rem;color:var(--muted)}

/* ANIMATIONS */
.fade-in{animation:fadeIn 0.35s ease forwards}
@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}

/* BLOG */
.blog-back-btn{background:transparent;border:none;color:var(--muted);font-family:var(--mono);font-size:0.8rem;cursor:pointer;display:flex;align-items:center;gap:0.4rem;padding:0;letter-spacing:0.05em;margin-bottom:2rem;transition:color 0.2s}
.blog-back-btn:hover{color:var(--blue)}
.blog-quote{border-left:3px solid var(--blue);padding-left:1rem;margin:1.5rem 0;color:#94A3B8;font-size:0.95rem;line-height:1.75;white-space:pre-line}
.blog-code{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:1rem 1.25rem;font-family:var(--mono);font-size:0.85rem;color:#7DD3FC;margin:1.5rem 0;letter-spacing:0.02em}
.blog-img-wrap{margin:2rem 0;text-align:center}
.blog-img-wrap img{max-width:100%;width:100%;max-width:900px;height:auto;border-radius:10px;border:1px solid var(--border);box-shadow:0 4px 32px rgba(0,0,0,0.4);display:inline-block}
.blog-img-caption{margin-top:0.65rem;font-family:var(--mono);font-size:0.72rem;color:var(--muted);font-style:italic;text-align:center;letter-spacing:0.02em}

/* BLOG CARDS */
.blog-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:1.5rem 1.75rem;cursor:pointer;transition:border-color 0.2s,transform 0.2s,background 0.2s}
.blog-card:hover{border-color:var(--blue);transform:translateY(-2px);background:var(--surface2)}
.blog-series{font-family:var(--mono);font-size:0.68rem;color:var(--blue);letter-spacing:0.1em;text-transform:uppercase;margin-bottom:0.5rem}
.blog-title{font-family:'Syne',sans-serif;font-weight:700;font-size:1.05rem;color:#fff;margin-bottom:0.5rem;line-height:1.3}
.blog-subtitle{font-size:0.85rem;color:#94A3B8;line-height:1.65;margin-bottom:0.75rem;font-weight:300}
.blog-meta{font-family:var(--mono);font-size:0.7rem;color:var(--muted)}

/* BLOG SERIES CONTINUE LINK */
.blog-continue{display:inline-flex;align-items:center;gap:0.5rem;margin-top:2.5rem;padding:0.75rem 1.5rem;background:transparent;border:1px solid var(--border);border-radius:8px;color:#E2E8F0;font-family:var(--mono);font-size:0.82rem;cursor:pointer;transition:border-color 0.2s,color 0.2s;text-decoration:none}
.blog-continue:hover{border-color:var(--blue);color:var(--blue)}
.blog-continue-label{font-size:0.68rem;color:var(--muted);display:block;margin-bottom:0.2rem;letter-spacing:0.08em;text-transform:uppercase}
.blog-continue-title{color:#E2E8F0;transition:color 0.2s}
.blog-continue:hover .blog-continue-title{color:var(--blue)}

/* EVOLUTION TREE STYLES (BANYAN TREE INTERACTIVE NAVIGATION) */
.tree-viewport {
  position: relative;
  width: 100%;
  max-width: 860px;
  height: 520px;
  overflow: hidden;
  background: radial-gradient(circle at center, #0B132B 0%, #030712 100%);
  border: 1px solid var(--border);
  border-radius: 16px;
  margin: 2.5rem auto;
  box-shadow: inset 0 0 60px rgba(0, 0, 0, 0.95), 0 20px 45px rgba(0, 0, 0, 0.65);
}
.tree-tooltip {
  position: absolute;
  pointer-events: none;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(59, 130, 246, 0.25);
  color: #F8FAFC;
  padding: 0.5rem 0.8rem;
  border-radius: 8px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.4), 0 0 12px rgba(59, 130, 246, 0.15);
  opacity: 0;
  transform: translate(-50%, -100%) scale(0.95);
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 100;
  white-space: nowrap;
}
.tree-tooltip.active {
  opacity: 1;
  transform: translate(-50%, -100%) scale(1);
}

/* EVOLUTION TREE STYLES (ANIMATED BANYAN TREE INTEGRATION) */
@property --op {
  syntax: '<number>';
  inherits: false;
  initial-value: 0;
}
@property --dr {
  syntax: '<length>';
  inherits: false;
  initial-value: 0px;
}

.tree-viewport {
  position: relative;
  width: 100%;
  max-width: 860px;
  height: 520px;
  overflow: hidden;
  background: #07050c;
  border: 1px solid var(--border);
  border-radius: 16px;
  margin: 2.5rem auto;
  box-shadow: inset 0 0 60px rgba(0, 0, 0, 0.95), 0 20px 45px rgba(0, 0, 0, 0.65);
}
.tree-sway-wrap {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
/* Dual image filters: Sleeping vs. Awakened (SVG-embedded images) */
.tree-img-muted {
  filter: grayscale(85%) brightness(14%) contrast(85%);
  opacity: 0.65;
}
.tree-img-warm {
  mask: url(#sap-mask);
  -webkit-mask: url(#sap-mask);
  filter: saturate(125%) brightness(108%) drop-shadow(0 0 14px rgba(220,160,48,0.22));
}

.tree-svg-overlay {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  pointer-events: none;
}
.tree-hotspot-group {
  pointer-events: stroke;
  cursor: pointer;
}

/* Gentle organic sway for the whole tree structure */
@keyframes sway {
  0%, 100% { transform: rotate(0deg)      scale(1.000); }
  30%      { transform: rotate(0.38deg)   scale(1.002); }
  70%      { transform: rotate(-0.38deg)  scale(0.999); }
}
.sway {
  transform-origin: 50% 90%;
  animation: sway 7.5s ease-in-out infinite;
  animation-delay: 9.5s;
  will-change: transform;
}

/* Class-based transitions for volumetric glow layers */
.cinematic-vignette {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(ellipse 86% 86% at 50% 48%, transparent 38%, rgba(7,5,12,0.92) 100%);
  z-index: 3;
}
.root-spark {
  position: absolute;
  pointer-events: none;
  bottom: 2%;
  left: 50%;
  width: 34%;
  height: 17%;
  background: radial-gradient(ellipse 75% 80% at 50% 95%, rgba(226,158,38,0.72) 0%, rgba(200,120,16,0.36) 42%, transparent 72%);
  filter: blur(18px);
  mix-blend-mode: screen;
  transform: translateX(-50%) scale(0.12);
  opacity: 0;
  transition: opacity 2.5s cubic-bezier(0, 0, 0.35, 1), transform 2.5s cubic-bezier(0, 0, 0.35, 1);
  z-index: 1;
}
.root-spark.active {
  opacity: 1;
  transform: translateX(-50%) scale(1);
}
.roots-spreading {
  position: absolute;
  pointer-events: none;
  bottom: 5%;
  left: 50%;
  width: 78%;
  height: 28%;
  background: radial-gradient(ellipse 100% 62% at 50% 88%, rgba(210,142,28,0.44) 0%, rgba(182,108,12,0.20) 52%, transparent 80%);
  filter: blur(26px);
  mix-blend-mode: screen;
  transform: translateX(-50%) scale(0.08, 0.45);
  opacity: 0;
  transition: opacity 3s cubic-bezier(0, 0, 0.25, 1), transform 3s cubic-bezier(0, 0, 0.25, 1);
  z-index: 1;
}
.roots-spreading.active {
  opacity: 1;
  transform: translateX(-50%) scale(1, 1);
}
.trunk-glow {
  position: absolute;
  pointer-events: none;
  bottom: 9%;
  left: 50%;
  width: 22%;
  height: 55%;
  background: radial-gradient(ellipse 55% 100% at 50% 76%, rgba(200,132,24,0.30) 0%, rgba(165,102,8,0.12) 60%, transparent 82%);
  filter: blur(28px);
  mix-blend-mode: screen;
  transform-origin: 50% 100%;
  transform: translateX(-50%) scaleY(0.04);
  opacity: 0;
  transition: opacity 4s cubic-bezier(0.25, 0, 0.3, 1), transform 4s cubic-bezier(0.25, 0, 0.3, 1);
  z-index: 1;
}
.trunk-glow.active {
  opacity: 1;
  transform: translateX(-50%) scaleY(1);
}
.left-branch-glow, .right-branch-glow, .canopy-glow {
  display: none;
}
.ground-shadow {
  position: absolute;
  pointer-events: none;
  bottom: 0;
  left: 50%;
  width: 78%;
  height: 10%;
  background: radial-gradient(ellipse 100% 40% at 50% 100%, rgba(3,2,6,0.68) 0%, rgba(3,2,6,0.30) 55%, transparent 82%);
  filter: blur(6px);
  transform: translateX(-50%);
  opacity: 0;
  animation: ground-shadow-fade 6s ease-in-out both;
  animation-delay: 2.5s;
  z-index: 1;
}
@keyframes ground-shadow-fade {
  to {
    opacity: 1;
  }
}

/* Floating Golden Motes */
.motes-container {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 2;
}
.mote {
  position: absolute;
  pointer-events: none;
  border-radius: 50%;
  background: rgba(220,160,48,0.9);
  box-shadow: 0 0 calc(var(--sz) * 2.5) rgba(218,155,44,0.38);
  width: var(--sz);
  height: var(--sz);
  animation: mote-rise var(--dur) ease-in-out infinite var(--dl);
  opacity: 0;
}
@keyframes mote-rise {
  0%   { opacity: 0;           transform: translateY(0px)    translateX(0px);   }
  12%  { opacity: var(--op);                                                     }
  88%  { opacity: var(--op);                                                     }
  100% { opacity: 0;           transform: translateY(-190px) translateX(var(--dr)); }
}

@media(max-width: 900px) {
  .tree-viewport {
    height: 480px;
    margin: 1.5rem auto;
  }
}
@media(max-width: 640px) {
  .tree-viewport {
    height: 400px;
    margin: 1rem auto;
  }
}


/* CONTROL FILTER HOUSING */
.control-housing{display:flex;align-items:center;gap:0.75rem;background:var(--surface);border:1px solid var(--border);border-radius:6px;padding:0.35rem 0.75rem}
.control-label{font-family:var(--mono);font-size:0.7rem;color:var(--muted);text-transform:uppercase;letter-spacing:0.05em}
.select-dark{background:transparent;border:none;color:var(--text);font-family:var(--mono);font-size:0.75rem;outline:none;cursor:pointer}
.select-dark option{background:#1E293B;color:var(--text)}

/* MODAL SYSTEM */
.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(15,23,42,0.85);backdrop-filter:blur(10px);z-index:200;display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity 0.3s ease;padding:1.5rem}
.modal-overlay.active{opacity:1;pointer-events:all}
.modal-card{background:#11192E;border:1px solid var(--border);border-radius:16px;max-width:460px;width:100%;padding:2.25rem;position:relative;transform:translateY(15px);transition:transform 0.3s ease;box-shadow:0 25px 50px -12px rgba(0,0,0,0.5)}
.modal-overlay.active .modal-card{transform:translateY(0)}
.modal-close{position:absolute;top:1.25rem;right:1.25rem;background:transparent;border:none;color:var(--muted);font-family:var(--mono);font-size:1rem;cursor:pointer;transition:color 0.2s}
.modal-close:hover{color:#fff}
.modal-title{font-family:'Syne',sans-serif;font-weight:700;font-size:1.6rem;color:#fff;margin-bottom:0.75rem;letter-spacing:-0.01em}
.modal-desc{font-size:0.95rem;line-height:1.6;color:#94A3B8;margin-bottom:1.5rem;font-weight:300}
.modal-explores-label{font-family:var(--mono);font-size:0.7rem;color:var(--blue);letter-spacing:0.1em;text-transform:uppercase;margin-bottom:0.75rem}
.modal-explores-list{display:grid;grid-template-columns:1fr 1fr;gap:0.5rem;margin-bottom:2rem;list-style:none}
.modal-explores-item{font-size:0.88rem;color:#CBD5E1;display:flex;align-items:center;gap:0.5rem}
.modal-explores-item::before{content:'•';color:var(--blue)}

/* TABLET */
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr}
  .about-grid{grid-template-columns:1fr;gap:2.5rem}
  .journey-content{grid-template-columns:1fr}
  .node-selector{flex-wrap:wrap}
  .node-btn{min-width:45%}
}

/* MOBILE */
@media(max-width:640px){
  nav{padding:0.9rem 1.25rem;justify-content:center}
  .nav-links{gap:1.5rem}
  .nav-links a{font-size:0.8rem}
  .empty-page{padding:100px 1.25rem 3rem}
  .empty-title{font-size:clamp(1.5rem,6vw,1.9rem)}
  .empty-sub{font-size:0.82rem}
  #hero{padding:5.5rem 1.25rem 3rem}
  .hero-title{font-size:clamp(1.9rem,7vw,2.5rem)}
  .hero-sub{font-size:0.92rem;max-width:100%}
  .hero-btns{flex-direction:column;gap:0.75rem}
  .btn-primary,.btn-ghost{width:100%;justify-content:center;padding:0.85rem 1rem}
  #about{padding:3rem 1.25rem 3rem}
  #journey-section{padding:5.5rem 1.25rem 3rem}
  .node-selector{margin-bottom:2rem}
  .node-btn{min-width:48%;font-size:0.78rem;padding:0.6rem 0.5rem}
  .node-btn .step-num{font-size:0.6rem}
  .node-heading{font-size:1.4rem}
  .node-desc{font-size:0.88rem}
  .info-card{padding:1rem 1.1rem}
  footer{padding:2rem 1.25rem}
  .footer-text{font-size:0.68rem}
}
@media(max-width:380px){
  .nav-links{gap:1rem}
  .nav-links a{font-size:0.72rem}
  .node-btn{min-width:100%}
}

/* FEEDBACK FORM */
.feedback-form {
  display: flex;
  flex-direction: column;
  width: 100%;
}

/* SYSTEMS TREE NODE PROGRESS */
.tree-node-progress {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 0.35rem;
  letter-spacing: 0.02em;
}
.tree-node.disabled {
  pointer-events: none;
}

/* SYSTEMS MAP PROGRESSION (MODAL) */
.exploration-progression {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
  margin-bottom: 1.25rem;
}
.progression-item {
  display: flex;
  align-items: center;
  padding: 0.75rem 1rem;
  border-radius: 8px;
  background: var(--surface2);
  border: 1px solid var(--border);
  transition: all 0.2s ease;
  font-family: 'DM Sans', sans-serif;
}
.progression-item.active {
  cursor: pointer;
}
.progression-item.active:hover {
  border-color: var(--blue);
  background: rgba(59, 130, 246, 0.05);
  transform: translateX(4px);
}
.progression-item.locked {
  opacity: 0.55;
  background: rgba(30, 41, 59, 0.35);
  border-style: dashed;
}
.progression-num {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--blue);
  margin-right: 0.85rem;
  font-weight: 500;
}
.progression-item.locked .progression-num {
  color: var(--muted);
}
.progression-title {
  font-size: 0.88rem;
  font-weight: 500;
  color: #E2E8F0;
}
.progression-item.locked .progression-title {
  color: var(--muted);
}
.progression-badge {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.62rem;
  color: var(--blue);
  background: var(--blue-glow);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  border: 1px solid rgba(59, 130, 246, 0.25);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* EXPLORATION NAV BLOCK (DOUBLE-LINKED LIST) */
.exploration-nav-block {
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
  font-family: 'DM Sans', sans-serif;
}
.exploration-nav-header {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 2rem;
  text-align: center;
}
.nav-node-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.nav-node-name {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
  color: #fff;
}
.exploration-nav-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: flex-start;
  max-width: 600px;
  margin: 0 auto;
}
.nav-prev, .nav-next {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.nav-prev {
  text-align: right;
}
.nav-next {
  text-align: left;
}
.nav-dir-label {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.nav-link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--blue);
  text-decoration: none;
  cursor: pointer;
  transition: color 0.2s ease;
  line-height: 1.4;
}
.nav-link.active:hover {
  color: #fff;
}
.nav-link.locked {
  color: var(--muted);
  font-style: italic;
  cursor: default;
}
.nav-title-current {
  font-size: 0.88rem;
  font-weight: 500;
  color: #E2E8F0;
  line-height: 1.4;
}
@media (max-width: 640px) {
  .exploration-nav-grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
    text-align: center;
  }
  .nav-prev, .nav-next {
    text-align: center;
  }
}

/* ─── EDGECASE INTEGRATION STYLES ────────────────────────────────────────── */
.edgecase-wrapper {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin: 2rem 0;
}

.edgecase-header {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 0.95rem;
  color: #FFF;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.edgecase-header::before {
  content: "⬢";
  color: var(--blue);
}

.edgecase-subheader {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.edgecase-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.edgecase-control-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.edgecase-control-group label {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.edgecase-input {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.85rem;
  padding: 0.45rem 0.65rem;
  outline: none;
  width: 100%;
  box-sizing: border-box;
}

.edgecase-input:focus {
  border-color: var(--blue);
}

.edgecase-select {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.75rem;
  padding: 0.45rem 0.65rem;
  outline: none;
  cursor: pointer;
  width: 100%;
}

.edgecase-select option {
  background: #1E293B;
  color: var(--text);
}

.edgecase-select:focus {
  border-color: var(--blue);
}

.edgecase-slider-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.edgecase-slider {
  flex-grow: 1;
  accent-color: var(--blue);
  cursor: pointer;
}

.edgecase-slider-val {
  font-family: var(--mono);
  font-size: 0.75rem;
  min-width: 2rem;
  text-align: right;
}

.edgecase-button {
  background: var(--blue-glow);
  color: var(--blue);
  border: 1px solid rgba(59, 130, 246, 0.4);
  border-radius: 6px;
  padding: 0.5rem 1rem;
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
  align-self: flex-end;
  height: max-content;
}

.edgecase-button:hover {
  background: var(--blue);
  color: #FFF;
  border-color: var(--blue);
  transform: translateY(-1px);
}

.edgecase-visual {
  background: #0F172A;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1.5rem;
  overflow-x: auto;
}

.edgecase-visual svg {
  display: block;
  width: 100%;
  min-width: 600px;
}

.edgecase-output-panel {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1rem;
}

.edgecase-output-title {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  letter-spacing: 0.05em;
}

.edgecase-output-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.edgecase-output-box {
  background: #0F172A;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.75rem;
}

.edgecase-output-label {
  font-family: var(--mono);
  font-size: 0.6rem;
  color: var(--muted);
  text-transform: uppercase;
  margin-bottom: 0.25rem;
}

.edgecase-output-val {
  font-family: var(--mono);
  font-size: 0.9rem;
  color: #FFF;
  word-break: break-all;
  white-space: pre-wrap;
}

.edgecase-status-badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.6rem;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.edgecase-status-ok {
  background: rgba(16, 185, 129, 0.1);
  color: #10B981;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.edgecase-status-error {
  background: rgba(239, 68, 68, 0.1);
  color: #EF6868;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.text-corrupted {
  color: #EF6868;
  font-weight: 700;
}

/* ─── MULTI-PANEL EDGECASE REDESIGN ──────────────────────────────────────── */
.ec-panel {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.ec-panel-title {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 0.85rem;
  color: #FFF;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.ec-panel-title::before {
  content: "⚡";
  color: var(--blue);
}

.ec-conversion-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--mono);
  font-size: 0.72rem;
  margin-top: 0.5rem;
}

.ec-conversion-table th, .ec-conversion-table td {
  border: 1px solid var(--border);
  padding: 0.4rem 0.6rem;
  text-align: left;
}

.ec-conversion-table th {
  background: rgba(148, 163, 184, 0.05);
  color: var(--muted);
  font-weight: 500;
}

.ec-conversion-table td {
  color: var(--text);
}

.ec-frame-bits-container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.ec-bit-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 4px;
  min-width: 45px;
  background: #0F172A;
  overflow: hidden;
  font-family: var(--mono);
}

.ec-bit-box .bit-label {
  font-size: 0.55rem;
  color: var(--muted);
  padding: 0.2rem 0.3rem;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border);
  width: 100%;
  text-align: center;
}

.ec-bit-box .bit-value {
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.3rem;
  color: #FFF;
}

.ec-bit-box.bit-start { border-color: rgba(239, 68, 68, 0.4); }
.ec-bit-box.bit-start .bit-label { color: #EF6868; }
.ec-bit-box.bit-stop { border-color: rgba(16, 185, 129, 0.4); }
.ec-bit-box.bit-stop .bit-label { color: #10B981; }
.ec-bit-box.bit-parity { border-color: rgba(245, 158, 11, 0.4); }
.ec-bit-box.bit-parity .bit-label { color: #F59E0B; }

.ec-transmission-wire {
  position: relative;
  height: 80px;
  background: #0F172A;
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-top: 0.75rem;
  overflow: hidden;
}

.ec-wire-signal {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--border);
  transform: translateY(-50%);
}

.ec-wire-pulse {
  position: absolute;
  top: 40%;
  width: 12px;
  height: 12px;
  background: var(--blue);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--blue);
  transform: translate(-50%, -50%);
  animation: travelWire 2.5s infinite linear;
}

@keyframes travelWire {
  0% { left: 0%; opacity: 0; }
  5% { opacity: 1; }
  95% { opacity: 1; }
  100% { left: 100%; opacity: 0; }
}

.ec-advanced-toggle-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--border);
}

.ec-checkbox {
  width: 16px;
  height: 16px;
  accent-color: var(--blue);
  cursor: pointer;
}

.ec-checkbox-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--text);
  cursor: pointer;
  user-select: none;
}

/* ─── NEW UART CONVERSATION BUILDER INTEGRATION ─── */
.panel-box {
  background-color: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 1.25rem;
  transition: all 0.3s ease;
}

.panel-title {
  font-family: 'Syne', sans-serif;
  font-weight: 700;
  font-size: 0.9rem;
  color: #FFFFFF;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  letter-spacing: 0.05em;
}

.panel-title::before {
  content: "⚡";
  color: var(--blue);
}

.pipeline-step {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.35rem;
  font-weight: bold;
}

.code-display {
  font-family: var(--mono);
  background: #0F172A;
  padding: 0.6rem 1rem;
  border-radius: 6px;
  border: 1px solid rgba(148, 163, 184, 0.08);
  font-size: 1.1rem;
  color: #A5F3FC;
}

.code-highlight {
  color: #FFFFFF;
  background: rgba(59, 130, 246, 0.3);
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
  border-bottom: 2px solid var(--blue);
  font-weight: bold;
}

.agreement-item {
  font-family: var(--mono);
  font-size: 0.85rem;
  padding: 0.25rem 0.5rem;
  margin-bottom: 0.4rem;
  border-radius: 4px;
}

.agreement-ok {
  background: rgba(16, 185, 129, 0.08);
  color: #10B981;
  border: 1px solid rgba(16, 185, 129, 0.15);
}

.agreement-fail {
  background: rgba(239, 68, 68, 0.08);
  color: #EF6868;
  border: 1px solid rgba(239, 68, 68, 0.15);
}

.fifo-container {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.5rem;
}

.fifo-block {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(148, 163, 184, 0.15);
  border-radius: 4px;
  background: #0F172A;
  font-family: var(--mono);
  font-size: 1rem;
  font-weight: bold;
  color: #94A3B8;
}

.fifo-active {
  border-color: var(--blue);
  background: rgba(59, 130, 246, 0.1);
  color: #FFFFFF;
  box-shadow: 0 0 8px rgba(59, 130, 246, 0.2);
}

.fifo-active-rx {
  border-color: #10B981;
  background: rgba(16, 185, 129, 0.1);
  color: #FFFFFF;
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.2);
}

.register-container {
  display: flex;
  gap: 0.25rem;
  margin-top: 0.5rem;
  background: #0F172A;
  padding: 0.4rem;
  border-radius: 6px;
  border: 1px solid rgba(148, 163, 184, 0.08);
  width: max-content;
}

.register-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 32px;
  border: 1px solid rgba(148, 163, 184, 0.1);
  background: var(--surface);
  border-radius: 3px;
  font-family: var(--mono);
}

.register-label {
  font-size: 0.55rem;
  color: var(--muted);
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
  width: 100%;
  text-align: center;
  padding: 0.1rem 0;
}

.register-val {
  font-size: 0.8rem;
  font-weight: bold;
  color: #FFF;
  padding: 0.2rem 0;
}

.flow-step {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.8rem;
  padding: 0.25rem 0.5rem;
  background: #0F172A;
  border: 1px solid rgba(148, 163, 184, 0.1);
  border-radius: 4px;
  margin-right: 0.4rem;
  margin-bottom: 0.4rem;
}

.arrow-divider {
  display: block;
  text-align: center;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 1.2rem;
  margin: 0.5rem 0;
  opacity: 0.6;
}

/* SPI EdgeCases Custom Styling */
.terminal-box {
  background: #0F172A;
  border: 1px solid rgba(148, 163, 184, 0.12);
  border-radius: 8px;
  padding: 0.8rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  height: 200px;
  overflow-y: auto;
  line-height: 1.5;
  color: #A5F3FC;
  box-sizing: border-box;
}

.agreement-item {
  font-family: var(--mono);
  font-size: 0.75rem;
  padding: 0.4rem 0.6rem;
  margin-bottom: 0.5rem;
  border-radius: 6px;
  border: 1px solid rgba(148, 163, 184, 0.1);
}

.agreement-ok {
  background: rgba(16, 185, 129, 0.08);
  color: #10B981;
  border-color: rgba(16, 185, 129, 0.15);
}

.agreement-warning {
  background: rgba(245, 158, 11, 0.08);
  color: #F59E0B;
  border-color: rgba(245, 158, 11, 0.15);
}

.agreement-fail {
  background: rgba(239, 68, 68, 0.08);
  color: #EF6868;
  border-color: rgba(239, 68, 68, 0.15);
}

/* Comparisons Tables in Articles */
.blog-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.75rem 0;
  font-size: 0.85rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.blog-table th, .blog-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.blog-table th {
  background: rgba(148, 163, 184, 0.05);
  color: #FFF;
  font-family: 'Syne', sans-serif;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.blog-table td {
  color: #CBD5E1;
  font-family: 'DM Sans', sans-serif;
}

.blog-table tr:last-child td {
  border-bottom: none;
}

.blog-table tr:hover {
  background: rgba(255, 255, 255, 0.01);
}