/* =========================================================
   Unity Roadmap — softer palette + dark/light themes
   ========================================================= */

:root,
[data-theme="dark"]{
  /* softer dark palette */
  --bg:            #14161f;
  --bg-panel:      #1a1d28;
  --bg-card:       #21242f;
  --grid-line:     #1e2130;
  --border:        #2b3040;
  --border-strong: #3a3f52;

  --text:          #dcdfe8;
  --text-dim:      #8a8fa3;
  --text-dimmer:   #5b6075;

  --c-theme:       #e88a6b;   /* muted terracotta */
  --c-sub:         #8f95a3;   /* neutral gray */
  --c-done:        #7fb098;   /* sage green */
  --c-accent:      #7bb0d0;   /* dusty blue */
  --c-copy:        #b39ddb;   /* soft violet — "Copy AI Prompt" button */
  --c-about:       #a855f7;   /* purple — About Me node, standalone from the roadmap */

  --shadow: 0 4px 20px rgba(0,0,0,.35);
}

[data-theme="light"]{
  /* clean white palette — blue nodes, mint-green done state */
  --bg:            #ffffff;
  --bg-panel:      #f8fafc;
  --bg-card:       #f1f5f9;
  --grid-line:     #eef2f6;
  --border:        #e2e8f0;
  --border-strong: #cbd5e1;

  --text:          #1e293b;
  --text-dim:      #64748b;
  --text-dimmer:   #94a3b8;

  --c-theme:       #3b82f680;  /* main node blue */
  --c-sub:         #7c8ba1;    /* neutral slate, distinct from text-dimmer */
  --c-done:        #8ce2b8;    /* completed — mint green */
  --c-accent:      #f59e0b;    /* warm amber — contrasts blue + green */
  --c-copy:        #8b5cf6;    /* violet — "Copy AI Prompt" button */
  --c-about:       #9333ea;    /* purple — About Me node, standalone from the roadmap */

  --shadow: 0 4px 20px rgba(15,23,42,.08);
}

*{ box-sizing:border-box; }

html, body{
  margin:0; padding:0;
  width:100%; height:100%;
  background:var(--bg);
  color:var(--text);
  font-family:'Inter', sans-serif;
  overflow:hidden;
  transition: background .3s ease, color .3s ease;
}

body{
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 42px 42px;
}

/* --------- header --------- */
.hdr{
  position:fixed;
  top:0; left:0; right:0;
  height:64px;
  display:flex; align-items:center;
  gap:20px;
  padding:0 20px;
  background: color-mix(in srgb, var(--bg) 90%, transparent);
  backdrop-filter: blur(12px);
  border-bottom:1px solid var(--border);
  z-index:50;
  transition: background .3s ease, border-color .3s ease;
}

.hdr-left{ display:flex; align-items:center; gap:14px; flex-shrink:0; }

.logo{
  display:flex; align-items:center;
}
.logo-icon{
  width:20px; height:20px;
  filter: brightness(0) invert(1);
}

.hdr-title{
  font-family:'Space Grotesk', sans-serif;
  font-weight:700; font-size:17px;
}

.hdr-sub{
  font-family:'JetBrains Mono', monospace;
  font-size:11.5px;
  color:var(--text-dim);
  padding:3px 9px;
  border:1px solid var(--border);
  border-radius:20px;
}
.hdr-sub .arrow{ color:var(--c-theme); }
.hdr-sub.visit-badge{
  color: var(--c-accent);
  border-color: color-mix(in srgb, var(--c-accent) 40%, var(--border));
}

.hdr-progress{
  flex:1; max-width:520px;
  display:flex; flex-direction:column;
  gap:6px;
}
.hdr-progress-label{
  display:flex; justify-content:space-between; align-items:center;
  font-family:'JetBrains Mono', monospace;
  font-size:11px;
  color:var(--text-dim);
  letter-spacing:.3px;
}
.progress-percent{
  color:var(--c-done);
  font-weight:600;
  font-size:12px;
}
.hdr-progress-bar{
  height:5px;
  background:var(--border);
  border-radius:3px;
  overflow:hidden;
}
.hdr-progress-fill{
  height:100%;
  width:0%;
  background: var(--c-done);
  border-radius:3px;
  transition: width .4s cubic-bezier(.2,.8,.2,1);
}

.hdr-right{
  margin-left:auto;
  display:flex; align-items:center; gap:8px;
}
.hdr-right button, .hdr-right a{
  font-family:'JetBrains Mono', monospace;
  font-size:11px;
  letter-spacing:.5px;
  text-transform:uppercase;
  color:var(--text-dim);
  background:transparent;
  border:1px solid var(--border);
  padding:7px 12px;
  border-radius:6px;
  cursor:pointer;
  text-decoration:none;
  display:inline-flex; align-items:center;
  transition:color .15s, border-color .15s;
}
.hdr-right button:hover{ color:var(--c-theme); border-color:var(--c-theme); }
.hdr-right .icon-btn{
  width:34px; height:34px;
  padding:0;
  display:flex; align-items:center; justify-content:center;
  color:var(--text-dim);
}
.hdr-right .icon-btn:hover{ color:var(--c-accent); border-color:var(--c-accent); }
.theme-icon{ display:none; }
[data-theme="dark"] .icon-moon{ display:block; }
[data-theme="light"] .icon-sun{ display:block; }

/* --------- graph --------- */
#graph-root{ position:fixed; inset:0; top:64px; }
#graph-svg{ width:100%; height:100%; cursor:grab; }
#graph-svg:active{ cursor:grabbing; }

.link{
  stroke: var(--border);
  stroke-width:1.4px;
  fill:none;
  transition: stroke-opacity .15s;
}
.link.seq{
  stroke: var(--c-theme);
  stroke-opacity:.35;
  stroke-dasharray: 2 4;
}
.link.dim{ stroke-opacity:.08; }

.node{ cursor:pointer; }
.node-shape{
  stroke-width:1.6px;
  transition: filter .15s, stroke-width .15s;
}
.node.dim .node-shape{ opacity:.15; }
.node.dim .node-label{ opacity:.12; }
.node:hover .node-shape{ filter:brightness(1.35); stroke-width:2.4px; }

/* Theme hexagons — CSS-driven so theme switch is instant */
.theme-hex{
  fill: color-mix(in srgb, var(--c-theme) 16%, transparent);
  stroke: var(--c-theme);
}
.theme-hex.done{
  fill: color-mix(in srgb, var(--c-done) 22%, transparent);
  stroke: var(--c-done);
}
.sub-circle{
  fill: color-mix(in srgb, var(--c-sub) 12%, transparent);
  stroke: var(--c-sub);
}
.sub-circle.done{
  fill: color-mix(in srgb, var(--c-done) 22%, transparent);
  stroke: var(--c-done);
}

/* About Me — purple, visually separate from the roadmap flow */
.theme-hex.about{
  fill: color-mix(in srgb, var(--c-about) 20%, transparent);
  stroke: var(--c-about);
  stroke-dasharray: 3 3;
  transform-box: fill-box;
  transform-origin: center;
  animation: about-breathe 3.2s ease-in-out infinite;
}
@keyframes about-breathe{
  0%, 100%{ transform: scale(1); opacity:1; }
  50%{ transform: scale(1.08); opacity:.82; }
}
.sub-circle.about{
  fill: color-mix(in srgb, #fa5c5c 16%, transparent);
  stroke: #fa5c5c;
}
.sub-circle.about-linkedin{
  fill: color-mix(in srgb, #5cc9fa 16%, transparent);
  stroke: #5cc9fa;
}
.sub-circle.about-assetstore{
  fill: color-mix(in srgb, #a6e22e 16%, transparent);
  stroke: #a6e22e;
}
.sub-circle.about-x{
  fill: color-mix(in srgb, #ffffff 16%, transparent);
  stroke: #ffffff;
}
.sub-icon{
  pointer-events:none;
}

.node-label{
  font-family:'Inter', sans-serif;
  font-weight:600;
  fill: var(--text);
  pointer-events:none;
  paint-order:stroke;
  stroke: var(--bg);
  stroke-width:3px;
  stroke-linejoin:round;
}
.theme-label{ font-family:'Space Grotesk', sans-serif; font-size:13px; }
.sub-label{ font-size:10.5px; font-weight:500; fill: var(--text-dim); }

.theme-badge{
  font-family:'JetBrains Mono', monospace;
  font-size:9.5px;
  font-weight:600;
  pointer-events:none;
  fill: var(--c-theme);
}
.theme-hex.done + .theme-badge,
.theme-badge.done{ fill: var(--c-done); }
.theme-badge.about{ fill: var(--c-about); }

.sub-count{
  font-family:'JetBrains Mono', monospace;
  font-size:9px;
  fill: var(--text-dimmer);
  pointer-events:none;
}
.sub-count.done{ fill: var(--c-done); }

/* Progress ring — dashed track + green fill arc, shown on every node.
   Fills in as items/subtopics under it get checked off. */
.ring-track{
  fill:none;
  stroke: var(--text-dim);
  stroke-width:1.5px;
  stroke-dasharray:3 3;
  opacity:.4;
  pointer-events:none;
  transition: opacity .15s, stroke .15s;
}
.ring-progress{
  fill:none;
  stroke: var(--c-done);
  stroke-width:2px;
  transition: stroke-dashoffset .35s cubic-bezier(.2,.8,.2,1);
  pointer-events:none;
  /* NOTE: no CSS transform/rotate here on purpose. Rotating via CSS
     transform-origin:center is unreliable on SVG children (depends on
     transform-box / viewport vs. element bbox across browsers). The
     hexagon's own path already starts at the top (see hexPoints()),
     so it needs no rotation at all. The circle (sub-topic ring) needs
     a -90deg start-at-top rotation, applied as a native SVG transform
     attribute directly on that element in graph.js — that always
     rotates around the element's own local (0,0), no ambiguity. */
}
/* Pinned (double-clicked) nodes get a brighter, solid track */
.node.pinned .ring-track{
  stroke: var(--text);
  stroke-dasharray: none;
  opacity:.7;
}

/* --------- legend --------- */
#legend{
  position:fixed; left:20px; bottom:20px;
  display:flex; flex-direction:column;
  gap:8px;
  padding:12px 14px;
  background: color-mix(in srgb, var(--bg-panel) 88%, transparent);
  backdrop-filter: blur(8px);
  border:1px solid var(--border);
  border-radius:10px;
  font-family:'JetBrains Mono', monospace;
  font-size:11.5px;
  color:var(--text-dim);
  z-index:40;
}
.leg-item{ display:flex; align-items:center; gap:8px; white-space:nowrap; }
.leg-dot{
  width:10px; height:10px;
  border:1.6px solid transparent;
  border-radius:3px;
  flex-shrink:0;
}
.leg-theme{
  border-color: var(--c-theme);
  background: color-mix(in srgb, var(--c-theme) 18%, transparent);
}
.leg-sub{
  border-color: var(--c-sub);
  background: color-mix(in srgb, var(--c-sub) 15%, transparent);
}
.leg-done{
  border-color: var(--c-done);
  background: var(--c-done);
}
.leg-hint{
  color: var(--text-dimmer);
  font-size:10.5px;
  padding-top:4px;
  border-top:1px solid var(--border);
  margin-top:2px;
}

/* --------- dark-icon inversion (e.g. Unity logo: black -> white on dark theme) --------- */
[data-theme="dark"] .invert-dark{ filter: invert(1); }

/* --------- controls --------- */
#controls{
  position:fixed; right:20px; bottom:20px;
  display:flex; gap:8px;
  z-index:40;
}
#controls button{
  width:38px; height:38px;
  border-radius:9px;
  border:1px solid var(--border);
  background: color-mix(in srgb, var(--bg-panel) 88%, transparent);
  backdrop-filter: blur(8px);
  color: var(--text-dim);
  font-size:16px;
  cursor:pointer;
  transition:color .15s, border-color .15s;
}
#controls button:hover{ color: var(--text); border-color: var(--c-theme); }

/* --------- panel --------- */
.panel{
  position:fixed; top:64px; right:0; bottom:0;
  width:460px; max-width:95vw;
  background: var(--bg-panel);
  border-left:1px solid var(--border);
  transform: translateX(100%);
  transition: transform .28s cubic-bezier(.2,.8,.2,1),
              background .3s ease,
              border-color .3s ease;
  z-index:60;
  overflow-y:auto;
  padding:28px 26px 40px;
  box-shadow: var(--shadow);
}
.panel.open{ transform: translateX(0); }

#panel-close{
  position:absolute; top:16px; right:16px;
  width:30px; height:30px;
  border-radius:8px;
  border:1px solid var(--border);
  background:transparent;
  color: var(--text-dim);
  cursor:pointer;
  font-size:13px;
  z-index:2;
}
#panel-close:hover{ color: var(--text); border-color: var(--c-theme); }

#backdrop{
  position:fixed; inset:0;
  background: rgba(0,0,0,.35);
  opacity:0; pointer-events:none;
  transition: opacity .25s ease;
  z-index:55;
}
[data-theme="light"] #backdrop{ background: rgba(80,60,40,.18); }
#backdrop.open{ opacity:1; pointer-events:auto; }

.p-avatar-row{
  display:flex;
  align-items:center;
  gap:14px;
  margin:0 0 16px;
}
.p-avatar{
  display:block;
  width:96px; height:96px;
  border-radius:50%;
  object-fit:cover;
  border:2px solid var(--c-about, var(--border-strong));
  margin:0;
  cursor:pointer;
  user-select:none;
  transform-origin:bottom center;
}
.p-avatar.bounce{
  animation: avatar-bounce .7s cubic-bezier(.28,1.6,.5,1);
}
@keyframes avatar-bounce{
  0%   { transform: translateY(0) scale(1,1); }
  20%  { transform: translateY(2px) scale(1.08,.9); }
  45%  { transform: translateY(-26px) scale(.95,1.08) rotate(-6deg); }
  65%  { transform: translateY(0) scale(1.06,.94) rotate(4deg); }
  80%  { transform: translateY(-8px) scale(.98,1.03) rotate(-2deg); }
  100% { transform: translateY(0) scale(1,1) rotate(0); }
}
.p-avatar-count{
  font-family:'JetBrains Mono', monospace;
  font-size:12.5px;
  color: var(--text-dim);
  letter-spacing:.3px;
}
.p-avatar-msg{
  font-size:13px;
  font-weight:600;
  color: var(--c-about, var(--text));
  margin:0 0 16px;
}
.p-avatar-msg[hidden]{ display:none; }

/* rainbow glow unlocked via avatar click milestones */
.p-sublist li a.milestone-glow{
  border-color: transparent;
  background-image:
    linear-gradient(var(--bg-panel), var(--bg-panel)),
    linear-gradient(90deg, #ff004c, #ff9900, #fff700, #00ff6a, #00d0ff, #7a5cff, #ff004c);
  background-origin: border-box;
  background-clip: padding-box, border-box;
  background-size: 100% 100%, 300% 100%;
  box-shadow: 0 0 14px color-mix(in srgb, var(--c-about, #a78bfa) 45%, transparent);
  animation: milestone-rainbow 3.5s linear infinite;
}
@keyframes milestone-rainbow{
  to { background-position: 0 0, 300% 0; }
}
.p-kind{
  font-family:'JetBrains Mono', monospace;
  font-size:10.5px;
  letter-spacing:1.5px;
  text-transform:uppercase;
  margin-bottom:10px;
}
.p-title{
  font-family:'Space Grotesk', sans-serif;
  font-size:24px; font-weight:700;
  line-height:1.2;
  margin:0 0 14px;
}
.p-desc{
  font-size:13.5px;
  line-height:1.6;
  color: var(--text-dim);
  margin:0 0 22px;
}
.p-section-label{
  font-family:'JetBrains Mono', monospace;
  font-size:10.5px;
  letter-spacing:1px;
  text-transform:uppercase;
  color: var(--text-dimmer);
  margin:0 0 12px;
}

.p-subprogress{
  display:flex; align-items:center;
  gap:10px;
  font-family:'JetBrains Mono', monospace;
  font-size:11px;
  color: var(--text-dim);
  margin: 0 0 22px;
  padding:10px 12px;
  border:1px solid var(--border);
  border-radius:8px;
  background: var(--bg-card);
}
.p-subprogress-bar{
  flex:1;
  height:4px;
  background: var(--border);
  border-radius:2px;
  overflow:hidden;
}
.p-subprogress-fill{
  height:100%;
  background: var(--c-done);
  border-radius:2px;
  transition: width .3s;
}

/* subtopic list (theme view) */
.p-sublist{
  list-style:none;
  margin:0 0 8px;
  padding:0;
  display:flex; flex-direction:column;
  gap:8px;
}
.p-sublist li a{
  display:flex; align-items:center; justify-content:space-between;
  gap:12px;
  padding:11px 14px;
  border:1px solid var(--border);
  border-radius:8px;
  color: var(--text);
  text-decoration:none;
  font-size:13px;
  transition:border-color .15s, background .15s;
}
.p-sublist li a:hover{
  border-color: var(--c-theme);
  background: color-mix(in srgb, var(--c-theme) 6%, transparent);
}
.p-sublist .sub-progress{
  font-family:'JetBrains Mono', monospace;
  font-size:10.5px;
  color: var(--text-dimmer);
}
.p-sublist .sub-progress.done{ color: var(--c-done); }

/* itch.io embeds (About Me → itch.io) */
.p-itchio-grid{
  display:flex; flex-direction:column;
  gap:14px;
  margin:0 0 8px;
}
.p-itchio-frame-wrap{
  position:relative;
  overflow:hidden;
}
.p-itchio-loader{
  position:absolute; inset:0;
  display:flex; align-items:center; justify-content:center;
  gap:6px;
  background: var(--bg-panel);
  opacity:0;
  pointer-events:none;
  transition: opacity .25s ease;
}
.p-itchio-frame-wrap.loading .p-itchio-loader{
  opacity:1;
}
.p-itchio-loader span{
  width:7px; height:7px;
  border-radius:50%;
  background: var(--c-sub);
  animation: p-itchio-bounce 1s ease-in-out infinite;
}
.p-itchio-loader span:nth-child(2){ animation-delay:.15s; }
.p-itchio-loader span:nth-child(3){ animation-delay:.3s; }
@keyframes p-itchio-bounce{
  0%, 80%, 100%{ transform: scale(.6); opacity:.4; }
  40%{ transform: scale(1); opacity:1; }
}
.p-itchio-frame-wrap iframe{
  display:block;
  transform-origin: top left;
}

/* item cards (subtopic view) */
.p-items{
  display:flex; flex-direction:column;
  gap:10px;
  margin: 0 0 8px;
}
.p-item{
  border:1px solid var(--border);
  border-radius:10px;
  background: var(--bg-card);
  overflow:hidden;
  transition:border-color .15s;
}
.p-item.done{ border-color: color-mix(in srgb, var(--c-done) 55%, var(--border)); }

.p-item-head{
  display:flex; align-items:center;
  gap:12px;
  padding:12px 14px;
  cursor:pointer;
  user-select:none;
}
.p-item-head:hover{ background: color-mix(in srgb, var(--text) 3%, transparent); }

.p-check{
  width:20px; height:20px;
  border:1.6px solid var(--border-strong);
  border-radius:5px;
  flex-shrink:0;
  display:flex; align-items:center; justify-content:center;
  cursor:pointer;
  background:transparent;
  transition:all .15s;
}
.p-check:hover{ border-color: var(--c-done); }
.p-check.checked{
  background: var(--c-done);
  border-color: var(--c-done);
}
.p-check.checked::after{
  content:'';
  width:5px; height:9px;
  border:solid var(--bg-panel);
  border-width:0 2px 2px 0;
  transform: rotate(45deg) translate(-1px,-1px);
}

.p-item-title{
  flex:1;
  font-weight:600;
  font-size:13.5px;
  line-height:1.35;
}
.p-item.done .p-item-title{ color: var(--text-dim); }

.p-item-chev{
  color: var(--text-dimmer);
  font-size:11px;
  transition: transform .2s;
}
.p-item.expanded .p-item-chev{ transform: rotate(90deg); }

.p-item-body{
  display:grid;
  grid-template-rows: 0fr;
  overflow:hidden;
  transition: grid-template-rows .35s cubic-bezier(.2,.8,.2,1);
}
.p-item.expanded .p-item-body{ grid-template-rows: 1fr; }
.p-item-body-inner{
  min-height:0;
  overflow:hidden;
  padding:0 14px 0 46px;
  display:flex; flex-direction:column;
  gap:12px;
}
.p-item.expanded .p-item-body-inner{ padding-bottom:14px; }

.p-item-section{
  font-size:12.5px;
  line-height:1.55;
  color: var(--text-dim);
}
.p-item-section-label{
  display:block;
  font-family:'JetBrains Mono', monospace;
  font-size:9.5px;
  letter-spacing:1px;
  text-transform:uppercase;
  color: var(--text-dimmer);
  margin-bottom:4px;
}
.p-item-section strong{ color: var(--text); font-weight:600; }

/* Example + Problem/Solution callouts */
.p-callout{
  padding:10px 12px;
  border-left:2px solid var(--border-strong);
  background: color-mix(in srgb, var(--text) 3%, transparent);
  border-radius:0 6px 6px 0;
  font-size:12.5px;
  line-height:1.55;
  color: var(--text-dim);
}
.p-callout .p-item-section-label{ margin-bottom:6px; }
.p-callout.example{
  border-left-color: var(--c-accent);
  background: color-mix(in srgb, var(--c-accent) 6%, transparent);
  font-family:'JetBrains Mono', monospace;
  font-size:11.5px;
  color: var(--text);
}
.p-callout.example .p-item-section-label{ font-family:'JetBrains Mono', monospace; }
.p-callout.problem{
  border-left-color: var(--c-theme);
  background: color-mix(in srgb, var(--c-theme) 6%, transparent);
}
.p-callout.problem strong{ color: var(--text); font-weight:600; }
.p-callout code{
  font-family:'JetBrains Mono', monospace;
  font-size:11.5px;
  padding:1px 5px;
  border-radius:3px;
  background: color-mix(in srgb, var(--text) 8%, transparent);
  color: var(--text);
}

/* Use-case bullet list */
.p-usecases{
  list-style:none;
  padding:0;
  margin:4px 0 0;
  display:flex; flex-direction:column;
  gap:5px;
}
.p-usecases li{
  font-size:12.5px;
  color: var(--text-dim);
  padding-left:18px;
  position:relative;
  line-height:1.45;
}
.p-usecases li::before{
  content:'→';
  position:absolute;
  left:0; top:0;
  color: var(--c-done);
  font-weight:600;
}
.p-usecases li code{
  font-family:'JetBrains Mono', monospace;
  font-size:11.5px;
  padding:1px 5px;
  border-radius:3px;
  background: color-mix(in srgb, var(--text) 8%, transparent);
  color: var(--text);
}

.p-links{
  display:flex; flex-wrap:wrap;
  gap:8px;
  margin-top:2px;
}
.p-link-btn{
  display:inline-flex; align-items:center;
  gap:8px;
  padding:8px 12px;
  border:1px solid var(--border);
  border-radius:6px;
  text-decoration:none;
  font-size:12px;
  font-family:'JetBrains Mono', monospace;
  transition:border-color .15s, background .15s;
}
.p-link-btn.video{ color: var(--c-accent); }
.p-link-btn.video:hover{
  border-color: var(--c-accent);
  background: color-mix(in srgb, var(--c-accent) 8%, transparent);
}
.p-link-btn.ref{ color: var(--c-theme); }
.p-link-btn.ref:hover{
  border-color: var(--c-theme);
  background: color-mix(in srgb, var(--c-theme) 8%, transparent);
}
.p-link-btn.store{ color: var(--c-done); }
.p-link-btn.store:hover{
  border-color: var(--c-done);
  background: color-mix(in srgb, var(--c-done) 8%, transparent);
}
.p-link-btn.copy{
  appearance:none; -webkit-appearance:none;
  margin:0;
  background:transparent;
  color: var(--c-copy);
  cursor:pointer;
  font-family:'JetBrains Mono', monospace;
  font-size:12px;
  line-height:normal;
}
.p-link-btn.copy:hover{
  border-color: var(--c-copy);
  background: color-mix(in srgb, var(--c-copy) 8%, transparent);
}
.p-link-btn.copy.copied{
  color: var(--c-done);
  border-color: var(--c-done);
  background: color-mix(in srgb, var(--c-done) 10%, transparent);
}
.p-link-btn.copy.copy-failed{
  color: var(--c-theme);
  border-color: var(--c-theme);
  background: color-mix(in srgb, var(--c-theme) 10%, transparent);
}
.clip-icon{
  width:11px; height:13px;
  border:1.4px solid currentColor;
  border-radius:2px;
  position:relative;
  flex-shrink:0;
}
.clip-icon::before{
  content:'';
  position:absolute;
  top:-3px; left:50%;
  transform:translateX(-50%);
  width:6px; height:3px;
  border:1.4px solid currentColor;
  border-bottom:none;
  border-radius:2px 2px 0 0;
  background: var(--bg-card);
}
.p-link-btn .play{
  width:0; height:0;
  border-left:6px solid currentColor;
  border-top:4px solid transparent;
  border-bottom:4px solid transparent;
}

/* prev/next nav in theme view */
.p-seq{
  margin-top:22px;
  padding-top:16px;
  border-top:1px solid var(--border);
  display:flex; justify-content:space-between;
  gap:12px;
}
.p-seq a{
  flex:1;
  padding:10px 12px;
  border:1px solid var(--border);
  border-radius:8px;
  color: var(--text-dim);
  text-decoration:none;
  font-size:11.5px;
  font-family:'JetBrains Mono', monospace;
  transition:color .15s, border-color .15s;
}
.p-seq a:hover{ color: var(--text); border-color: var(--c-theme); }
.p-seq a.next{ text-align:right; }
.p-seq a.disabled{ opacity:.3; pointer-events:none; }
.p-seq a .arrow{ color: var(--c-theme); }

/* ============================================================
   First-visit onboarding — quest-style callout + spotlight
   ============================================================ */
#onboarding-overlay{
  position:fixed; inset:0;
  z-index:200;
  opacity:0;
  transition: opacity .32s ease;
  pointer-events:none;
}
#onboarding-overlay.visible{ opacity:1; pointer-events:auto; }

.onb-spotlight{
  position:absolute;
  width:110px; height:110px;
  transform:translate(-50%,-50%);
  border-radius:50%;
  pointer-events:none;
  box-shadow: 0 0 0 2000px rgba(6, 8, 14, 0.72);
  animation: onb-pulse 2.2s ease-in-out infinite;
}
[data-theme="light"] .onb-spotlight{
  box-shadow: 0 0 0 2000px rgba(20, 22, 30, 0.55);
}
@keyframes onb-pulse{
  0%, 100% { box-shadow: 0 0 0 2000px rgba(6, 8, 14, 0.72), 0 0 0 0 color-mix(in srgb, var(--c-theme) 55%, transparent); }
  50%      { box-shadow: 0 0 0 2000px rgba(6, 8, 14, 0.72), 0 0 0 14px color-mix(in srgb, var(--c-theme) 0%, transparent); }
}

.onb-card{
  position:absolute;
  width:320px;
  transform:translate(-50%, 78px);
  padding:18px 20px 20px;
  border-radius:14px;
  background: linear-gradient(180deg, var(--bg-panel) 0%, color-mix(in srgb, var(--bg-panel) 90%, var(--c-theme) 10%) 100%);
  border:1px solid color-mix(in srgb, var(--c-theme) 55%, var(--border));
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--c-theme) 25%, transparent), 0 24px 60px -12px rgba(0,0,0,.6), 0 0 40px -8px color-mix(in srgb, var(--c-theme) 45%, transparent);
  opacity:0;
  transition: opacity .35s ease .1s, transform .35s ease .1s;
}
#onboarding-overlay.visible .onb-card{
  opacity:1;
  transform:translate(-50%, 64px);
}
.onb-card-arrow{
  position:absolute;
  top:-9px; left:50%;
  width:16px; height:16px;
  transform:translateX(-50%) rotate(45deg);
  background: var(--bg-panel);
  border-left:1px solid color-mix(in srgb, var(--c-theme) 55%, var(--border));
  border-top:1px solid color-mix(in srgb, var(--c-theme) 55%, var(--border));
}
.onb-card-badge{
  display:inline-block;
  font-family:'JetBrains Mono', monospace;
  font-size:10.5px;
  letter-spacing:1.5px;
  text-transform:uppercase;
  color: var(--c-theme);
  background: color-mix(in srgb, var(--c-theme) 16%, transparent);
  border:1px solid color-mix(in srgb, var(--c-theme) 40%, transparent);
  border-radius:999px;
  padding:3px 10px;
  margin-bottom:10px;
}
.onb-card-title{
  font-family:'Space Grotesk', sans-serif;
  font-size:17px;
  font-weight:700;
  line-height:1.3;
  margin:0 0 8px;
  color: var(--text);
}
.onb-card-text{
  font-size:12.5px;
  line-height:1.55;
  color: var(--text-dim);
  margin:0 0 16px;
}
#onb-start-btn{
  display:flex; align-items:center; justify-content:center;
  gap:8px;
  width:100%;
  padding:10px 14px;
  border:none;
  border-radius:9px;
  font-family:'Space Grotesk', sans-serif;
  font-weight:700;
  font-size:13.5px;
  color:#0d0f14;
  background: linear-gradient(135deg, var(--c-theme), color-mix(in srgb, var(--c-theme) 70%, var(--c-accent)));
  cursor:pointer;
  transition: transform .15s ease, box-shadow .15s ease;
  box-shadow: 0 6px 18px -6px color-mix(in srgb, var(--c-theme) 70%, transparent);
}
#onb-start-btn:hover{ transform:translateY(-1px); box-shadow: 0 10px 22px -6px color-mix(in srgb, var(--c-theme) 80%, transparent); }
#onb-start-btn:active{ transform:translateY(0); }
.onb-arrow{ transition: transform .15s ease; }
#onb-start-btn:hover .onb-arrow{ transform:translateX(3px); }

/* =========================================================
   Mobile adaptation
   ========================================================= */
@media (max-width: 720px){
  html, body{ overflow:auto; }

  .hdr{
    height:auto;
    min-height:56px;
    flex-wrap:wrap;
    gap:10px 14px;
    padding:10px 14px;
  }
  .hdr-title{ font-size:14px; }
  .hdr-sub{ display:none; }
  .hdr-sub.visit-badge{ display:none; }
  .hdr-progress{
    order:3;
    max-width:none;
    flex-basis:100%;
  }
  .hdr-right{ gap:6px; }
  .hdr-right button{ padding:6px 10px; font-size:10px; }
  .hdr-right .icon-btn{ width:30px; height:30px; }

  #graph-root{ top:auto; position:fixed; inset:0; }

  #legend{
    left:10px; right:10px; bottom:10px;
    max-width:none;
    padding:8px 10px;
    font-size:10px;
  }
  .leg-hint{ display:none; }

  #controls{
    right:10px; bottom:10px;
  }
  #controls button{ width:34px; height:34px; }

  .panel{
    top:0; left:0; right:0; bottom:0;
    width:100%; max-width:none;
    transform: translateY(100%);
    padding:22px 18px 32px;
  }
  .panel.open{ transform: translateY(0); }
  #panel-close{ top:14px; right:14px; }

  .p-title{ font-size:20px; }

  .onb-card{
    width:min(320px, 84vw);
  }
}

@media (max-width: 420px){
  #legend .leg-item{ font-size:9.5px; }
  .hdr-title{ font-size:13px; }
}