/* ============================================================================
   AQUARGIN WAY — "The Blueprint Trail"
   A Trailhead-style learning experience for the platform's Functions feature.
   Design system: antique-blueprint chrome + warm paper reading surfaces,
   amber survey-route accents, editorial serif + grotesk + mono type.
   ============================================================================ */

/* Fonts load from Google when online; the site stays fully functional offline
   via the fallback stacks below. */
@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,400..900;1,9..144,400..600&family=Hanken+Grotesk:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;700&display=swap');

/* ---------------------------------------------------------------- tokens --- */
:root {
  /* blueprint chrome */
  --ink:        #081627;
  --ink-800:    #0b1f35;
  --ink-700:    #0f2944;
  --ink-600:    #143552;
  --ink-500:    #1f4a6e;
  --blueprint-line: rgba(120, 201, 232, 0.10);
  --blueprint-line-strong: rgba(120, 201, 232, 0.18);

  /* aqua / cyan — the "aquargin" nod + blueprint annotations */
  --aqua:       #2bb8cb;
  --aqua-bright:#46d7e6;
  --aqua-deep:  #0f6f7e;

  /* trail / route + badges (survey amber → sienna) */
  --trail:      #f2a83c;
  --trail-2:    #ec8a3e;
  --trail-deep: #d96b35;
  --seal:       #e0913a;

  /* paper reading surfaces */
  --paper:      #f3efe4;
  --paper-card: #fffdf7;
  --paper-2:    #ece5d4;
  --paper-edge: #e1d8c4;
  --paper-line: #e8e0cd;

  /* ink text */
  --tx:         #15293d;
  --tx-soft:    #3c5168;
  --tx-mute:    #586572;
  --tx-faint:   #5d6b78;

  /* status */
  --done:       #2fae74;
  --done-deep:  #1f8c5b;
  --warn:       #e0913a;
  --danger:     #e0573f;
  --info:       #3a8dde;

  /* node palette (mirrors the real function board node colors) */
  --n-start:   #6b7d90;
  --n-query:   #3a8dde;
  --n-assign:  #2bb8cb;
  --n-cond:    #f2a83c;
  --n-loop:    #8d6fe0;
  --n-create:  #2fae74;
  --n-update:  #5b8def;
  --n-delete:  #e0573f;
  --n-notify:  #e6953a;
  --n-call:    #7c5cff;
  --n-page:    #d96aa8;
  --n-end:     #6b7d90;

  /* type */
  --f-display: 'Fraunces', 'Iowan Old Style', Georgia, 'Times New Roman', serif;
  --f-ui:      'Hanken Grotesk', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --f-mono:    'JetBrains Mono', 'Cascadia Code', 'SFMono-Regular', Consolas, monospace;

  /* spacing / radius / shadow */
  --r-sm: 7px;  --r: 12px;  --r-lg: 18px;  --r-xl: 26px;
  --shadow-1: 0 1px 2px rgba(8,22,39,.06), 0 2px 8px rgba(8,22,39,.05);
  --shadow-2: 0 4px 14px rgba(8,22,39,.10), 0 12px 34px rgba(8,22,39,.10);
  --shadow-blue: 0 18px 50px rgba(4, 16, 30, .45);
  --maxw: 1180px;
}

/* ------------------------------------------------------------------ base --- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--f-ui);
  font-weight: 400;
  color: var(--tx);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1,h2,h3,h4 { font-family: var(--f-display); font-weight: 600; line-height: 1.12; color: var(--tx); margin: 0 0 .5em; letter-spacing: -.01em; }
h1 { font-size: clamp(2.1rem, 4.4vw, 3.4rem); }
h2 { font-size: clamp(1.5rem, 2.6vw, 2.1rem); }
h3 { font-size: 1.28rem; }
h4 { font-size: 1.06rem; font-weight: 700; }
p  { margin: 0 0 1rem; }
a  { color: var(--aqua-deep); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
img { max-width: 100%; display: block; }
code, kbd, samp { font-family: var(--f-mono); }
::selection { background: rgba(43,184,203,.28); }

/* blueprint grid — applied to dark chrome surfaces */
.bp {
  position: relative;
  background-color: var(--ink);
  background-image:
    linear-gradient(var(--blueprint-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--blueprint-line) 1px, transparent 1px),
    linear-gradient(var(--blueprint-line-strong) 1px, transparent 1px),
    linear-gradient(90deg, var(--blueprint-line-strong) 1px, transparent 1px),
    radial-gradient(120% 90% at 80% -10%, rgba(43,184,203,.16), transparent 60%),
    radial-gradient(90% 80% at 0% 110%, rgba(217,107,53,.12), transparent 55%);
  background-size: 26px 26px, 26px 26px, 130px 130px, 130px 130px, 100% 100%, 100% 100%;
  color: #dce8f1;
}
.bp::after { /* faint grain */
  content:""; position:absolute; inset:0; pointer-events:none; opacity:.5; mix-blend-mode:overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.35'/%3E%3C/svg%3E");
}
.bp > * { position: relative; z-index: 1; }

/* ----------------------------------------------------------- containers --- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(18px, 4vw, 40px); }
.wrap-tight { max-width: 880px; margin: 0 auto; padding: 0 clamp(18px, 4vw, 40px); }

/* --------------------------------------------------------------- topbar --- */
.aw-topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(8,22,39,.86);
  backdrop-filter: blur(10px) saturate(1.2);
  border-bottom: 1px solid rgba(120,201,232,.16);
}
.aw-topbar__in { max-width: var(--maxw); margin: 0 auto; padding: 11px clamp(18px,4vw,40px);
  display: flex; align-items: center; gap: 22px; }
.aw-brand { display: flex; align-items: center; gap: 11px; color: #eaf3f8; font-family: var(--f-display);
  font-weight: 600; font-size: 1.16rem; letter-spacing: -.01em; }
.aw-brand:hover { text-decoration: none; }
.aw-brand .mark { width: 30px; height: 30px; flex: 0 0 auto; }
.aw-brand .mark-sub { display:block; font-family: var(--f-mono); font-size:.56rem; letter-spacing:.32em;
  text-transform:uppercase; color: var(--aqua-bright); margin-top:-2px; }
.aw-nav { display: flex; gap: 4px; margin-left: 6px; }
.aw-nav a { color: #b9cad8; padding: 7px 13px; border-radius: 999px; font-size: .92rem; font-weight: 600; }
.aw-nav a:hover { color: #fff; background: rgba(120,201,232,.12); text-decoration: none; }
.aw-nav a.is-active { color: var(--ink); background: var(--aqua-bright); }
.aw-spacer { flex: 1; }
.aw-pill {
  display: inline-flex; align-items: center; gap: 9px; padding: 6px 8px 6px 14px;
  border: 1px solid rgba(120,201,232,.22); border-radius: 999px; color: #dbe8f1;
  font-size: .84rem; font-weight: 600; background: rgba(120,201,232,.06);
}
.aw-pill b { color: var(--trail); font-family: var(--f-mono); }
.aw-pill .seal-mini { width: 22px; height: 22px; }
.aw-reset { background: none; border: 0; color: #7e93a6; font: inherit; font-size: .8rem; cursor: pointer; padding: 6px; }
.aw-reset:hover { color: var(--danger); }

/* ----------------------------------------------------------------- hero --- */
.hero { overflow: hidden; }
.hero__in { max-width: var(--maxw); margin: 0 auto; padding: clamp(48px,7vw,96px) clamp(18px,4vw,40px) clamp(60px,8vw,110px);
  display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.hero__eyebrow { font-family: var(--f-mono); font-size: .76rem; letter-spacing: .3em; text-transform: uppercase;
  color: var(--aqua-bright); margin-bottom: 18px; display: inline-flex; gap: 10px; align-items: center; }
.hero__eyebrow::before { content:""; width: 30px; height: 1px; background: var(--aqua); display:inline-block; }
.hero__title { color: #f3f8fb; font-weight: 600; font-size: clamp(2.4rem, 5vw, 4rem); margin-bottom: 18px; }
.hero__title em { font-style: italic; color: var(--trail); }
.hero__lede { color: #c2d3e0; font-size: 1.14rem; max-width: 30em; margin-bottom: 30px; }
.hero__cta { display: flex; gap: 14px; flex-wrap: wrap; }
.hero__stats { display:flex; gap: 26px; margin-top: 38px; flex-wrap: wrap; }
.hero__stat b { display:block; font-family: var(--f-display); font-size: 1.7rem; color: #eaf3f8; line-height:1; }
.hero__stat span { font-size: .78rem; color: #8ea6b8; text-transform: uppercase; letter-spacing: .12em; font-weight:600; }

/* hero map — the animated survey route */
.hero__map { position: relative; aspect-ratio: 1/1; }
.hero__map svg { width: 100%; height: 100%; overflow: visible; }
.route-path { fill: none; stroke: var(--trail); stroke-width: 2.4; stroke-linecap: round;
  stroke-dasharray: 1; stroke-dashoffset: 1; filter: drop-shadow(0 0 6px rgba(242,168,60,.5)); }
.route-path.draw { animation: routeDraw 2.6s cubic-bezier(.7,0,.3,1) .35s forwards; }
@keyframes routeDraw { to { stroke-dashoffset: 0; } }
.route-ghost { fill: none; stroke: rgba(120,201,232,.22); stroke-width: 2.4; stroke-dasharray: 4 7; }
.waypoint { fill: var(--ink-700); stroke: var(--aqua-bright); stroke-width: 2; opacity: 0; }
.waypoint.lit { fill: var(--trail); stroke: #fff; }
.waypoint.pop { animation: wpPop .5s backwards; }
@keyframes wpPop { 0%{opacity:0; transform: scale(0)} 60%{transform: scale(1.35)} 100%{opacity:1; transform: scale(1)} }
.wp-label { font-family: var(--f-mono); font-size: 8.5px; fill: #aebfcd; letter-spacing:.06em; }

/* --------------------------------------------------------------- buttons --- */
.btn { display: inline-flex; align-items: center; gap: 9px; padding: 12px 22px; border-radius: 999px;
  font-family: var(--f-ui); font-weight: 700; font-size: .96rem; cursor: pointer; border: 1.5px solid transparent;
  transition: transform .15s ease, box-shadow .2s ease, background .2s ease; text-decoration: none; }
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn--primary { background: linear-gradient(180deg, var(--trail), var(--trail-deep)); color: #2a1606;
  box-shadow: 0 10px 24px rgba(217,107,53,.36); }
.btn--aqua { background: linear-gradient(180deg, var(--aqua-bright), var(--aqua-deep)); color: #04222a;
  box-shadow: 0 10px 24px rgba(43,184,203,.3); }
.btn--ghost { background: transparent; color: #dbe8f1; border-color: rgba(120,201,232,.4); }
.btn--ghost:hover { background: rgba(120,201,232,.1); }
.btn--ink { background: var(--ink-700); color: #eaf3f8; }
.btn--sm { padding: 8px 15px; font-size: .86rem; }
.btn[disabled] { opacity: .5; cursor: not-allowed; transform: none; }

/* ----------------------------------------------------------- section head -- */
.section { padding: clamp(46px, 6vw, 84px) 0; }
.section--paper { background: var(--paper); }
.section--paper2 { background: linear-gradient(180deg, var(--paper-2), var(--paper)); }
.eyebrow { font-family: var(--f-mono); font-size: .74rem; letter-spacing: .26em; text-transform: uppercase;
  color: var(--trail-deep); font-weight: 700; margin-bottom: 12px; }
.section__head { max-width: 42em; margin-bottom: 36px; }
.section__head p { color: var(--tx-soft); font-size: 1.06rem; }

/* ----------------------------------------------------------- track cards --- */
.tracks { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.tracks--paths { grid-template-columns: repeat(auto-fit, minmax(290px, 1fr)); }
.trail-block { margin-bottom: 56px; }
.trail-block:last-child { margin-bottom: 0; }
.trail-block .section__head { margin-bottom: 22px; }
.g-see { font-size: .82rem; color: var(--tx-mute); margin: 8px 0 0; }
.g-see a { font-family: var(--f-mono); font-size: .8rem; }
.track-card { position: relative; border-radius: var(--r-xl); padding: 30px; overflow: hidden;
  border: 1px solid rgba(120,201,232,.18); color: #e7f1f7; display: flex; flex-direction: column; min-height: 270px;
  box-shadow: var(--shadow-blue); }
.track-card__kicker { font-family: var(--f-mono); font-size: .72rem; letter-spacing:.24em; text-transform:uppercase;
  color: var(--aqua-bright); }
.track-card h3 { color: #fff; font-size: 1.7rem; margin: 8px 0 8px; }
.track-card p { color: #bcd0de; flex: 1; }
.track-card .track-meta { display:flex; gap:18px; margin: 6px 0 18px; font-size:.84rem; color:#9fb6c6; }
.track-card .track-meta b { color: var(--trail); font-family: var(--f-mono); }
.track-card__progress { height: 8px; border-radius: 999px; background: rgba(255,255,255,.12); overflow: hidden; margin-bottom: 16px; }
.track-card__progress > span { display:block; height:100%; background: linear-gradient(90deg, var(--trail), var(--trail-deep)); width:0; transition: width .8s ease; }
.track-card .deco { position:absolute; right:-40px; top:-30px; width: 200px; height: 200px; opacity:.5; pointer-events:none; }

/* --------------------------------------------------------- module cards --- */
.modules { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px,1fr)); gap: 20px; }
.module-card { background: var(--paper-card); border: 1px solid var(--paper-edge); border-radius: var(--r-lg);
  padding: 22px; display: flex; gap: 18px; align-items: flex-start; box-shadow: var(--shadow-1);
  transition: transform .18s ease, box-shadow .25s ease, border-color .2s ease; position: relative; }
.module-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-2); border-color: var(--seal); text-decoration: none; }
.module-card__no { font-family: var(--f-mono); font-size: .72rem; color: var(--tx-faint); }
.module-card h4 { margin: 2px 0 6px; font-size: 1.12rem; }
.module-card p { color: var(--tx-mute); font-size: .9rem; margin: 0 0 12px; }
.module-card .m-meta { display:flex; align-items:center; gap: 12px; font-size: .8rem; color: var(--tx-mute); }
.module-card .m-bar { height: 6px; border-radius: 999px; background: var(--paper-2); overflow: hidden; flex: 1; }
.module-card .m-bar > span { display:block; height:100%; width:0; background: var(--done); transition: width .7s ease; }
.module-card .m-status { font-weight: 700; font-size: .76rem; }
.is-locked .m-status { color: var(--tx-faint); }
.is-progress .m-status { color: var(--trail-deep); }
.is-done .m-status { color: var(--done-deep); }
.module-card.is-locked { opacity: .72; }

/* ------------------------------------------------------- badge / seal art -- */
.seal { width: 64px; height: 64px; flex: 0 0 auto; position: relative; }
.seal svg { width: 100%; height: 100%; display:block; }
.seal--locked { filter: grayscale(1) opacity(.45); }
.seal--earned .seal-ring { animation: sealStamp .55s cubic-bezier(.34,1.56,.64,1) backwards; }
@keyframes sealStamp { 0%{ transform: scale(1.7) rotate(-12deg); opacity:0 } 100%{ transform: scale(1) rotate(0); opacity:1 } }
.badge-shelf { display:flex; gap: 16px; flex-wrap: wrap; }
.badge-shelf .badge-slot { text-align:center; width: 92px; }
.badge-shelf .badge-slot span { display:block; font-size:.72rem; color: var(--tx-mute); margin-top:6px; font-weight:600; }

/* ------------------------------------------------------------ stat strip --- */
.stat-strip { display:grid; grid-template-columns: repeat(4,1fr); gap: 1px; background: rgba(120,201,232,.16);
  border: 1px solid rgba(120,201,232,.16); border-radius: var(--r-lg); overflow: hidden; }
.stat-strip .cell { background: var(--ink-800); padding: 22px; text-align:center; }
.stat-strip b { display:block; font-family: var(--f-display); font-size: 2rem; color: var(--trail); line-height:1; }
.stat-strip span { font-size:.76rem; text-transform:uppercase; letter-spacing:.12em; color:#9fb6c6; font-weight:600; }

/* ============================================================ MODULE PAGE == */
.module-hero { padding: clamp(34px,5vw,60px) 0 clamp(40px,6vw,70px); }
.module-hero .crumbs { font-family: var(--f-mono); font-size:.76rem; letter-spacing:.12em; color:#8aa2b4; margin-bottom:18px; }
.module-hero .crumbs a { color: var(--aqua-bright); }
.module-hero h1 { color:#f2f8fb; max-width: 16em; }
.module-hero .lede { color:#c2d3e0; font-size:1.12rem; max-width: 40em; }
.module-hero .mh-meta { display:flex; gap: 22px; margin-top: 24px; flex-wrap:wrap; align-items:center; }
.module-hero .mh-meta .chip-seal { width:40px; height:40px; }
.tag { display:inline-flex; align-items:center; gap:7px; font-family: var(--f-mono); font-size:.72rem; font-weight:600;
  letter-spacing:.08em; text-transform:uppercase; padding:5px 11px; border-radius:999px;
  border:1px solid rgba(120,201,232,.3); color:#bcd6e4; }
.tag--time::before{ content:"◷"; } .tag--units::before{ content:"❏"; }
.tag.tag--ctx { color: var(--ink); background: var(--aqua-bright); border-color: transparent; }

.module-layout { display: grid; grid-template-columns: 268px 1fr; gap: 40px; align-items: start;
  max-width: var(--maxw); margin: 0 auto; padding: 46px clamp(18px,4vw,40px) 90px; }

/* unit rail */
.unit-rail { position: sticky; top: 78px; }
.unit-rail__card { background: var(--paper-card); border: 1px solid var(--paper-edge); border-radius: var(--r-lg);
  padding: 18px; box-shadow: var(--shadow-1); }
.unit-rail h5 { font-family: var(--f-mono); font-size:.72rem; letter-spacing:.18em; text-transform:uppercase;
  color: var(--tx-mute); margin:0 0 4px; }
.unit-rail .rail-prog { font-size:.82rem; color: var(--tx-soft); margin-bottom: 14px; }
.unit-rail .rail-prog b { color: var(--done-deep); }
.unit-list { list-style:none; margin:0; padding:0; counter-reset: u; }
.unit-list li { margin: 1px 0; }
.unit-list a { display:flex; gap:11px; align-items:flex-start; padding:9px 10px; border-radius: var(--r-sm);
  color: var(--tx-soft); font-size:.9rem; font-weight:500; line-height:1.35; }
.unit-list a:hover { background: var(--paper-2); text-decoration:none; color: var(--tx); }
.unit-list a.is-current { background: rgba(43,184,203,.12); color: var(--tx); font-weight:700; box-shadow: inset 2px 0 0 var(--aqua); }
.unit-check { width: 19px; height: 19px; flex:0 0 auto; border-radius: 50%; border: 2px solid var(--paper-edge);
  margin-top: 1px; display:grid; place-items:center; font-size: 11px; color:#fff; }
.is-complete .unit-check, .unit-check.done { background: var(--done); border-color: var(--done); }
.unit-check.done::after { content:"✓"; }

/* unit content (paper) */
.unit-main { min-width: 0; }
.unit { display: none; }
.unit.is-active { display: block; animation: fadeUp .45s ease backwards; }
@keyframes fadeUp { from { opacity:0; transform: translateY(12px); } to { opacity:1; transform:none; } }
.unit > h2 { margin-top: 0; }
.unit .u-kicker { font-family: var(--f-mono); font-size:.74rem; letter-spacing:.2em; text-transform:uppercase;
  color: var(--trail-deep); font-weight:700; margin-bottom: 8px; }
.unit p, .unit li { color: var(--tx-soft); font-size: 1.04rem; }
.unit strong { color: var(--tx); }
.lead { font-size: 1.16rem !important; color: var(--tx) !important; }
.unit hr { border:0; border-top:1px solid var(--paper-line); margin: 32px 0; }

/* callouts */
.callout { border-radius: var(--r); padding: 16px 18px 16px 50px; margin: 22px 0; position: relative;
  border: 1px solid; font-size: .98rem; }
.callout::before { position:absolute; left:16px; top:15px; font-size:1.1rem; }
.callout p:last-child { margin-bottom: 0; }
.callout--info { background: #eaf4fb; border-color:#cbe4f5; } .callout--info::before{ content:"ⓘ"; color: var(--info); }
.callout--tip  { background: #e9f7f0; border-color:#c8ecda; } .callout--tip::before{ content:"✦"; color: var(--done-deep); }
.callout--warn { background: #fdf3e3; border-color:#f4ddb6; } .callout--warn::before{ content:"⚠"; color: var(--warn); }
.callout--rule { background: #fbece8; border-color:#f3cfc4; } .callout--rule::before{ content:"★"; color: var(--danger); }
.callout b.c-title { display:block; margin-bottom:3px; color: var(--tx); }

/* deep dive */
.deepdive { margin: 24px 0; border: 1px solid #d6c3a4; border-radius: var(--r); overflow: hidden; background: #fbf6ec; }
.deepdive > summary { cursor: pointer; padding: 13px 18px; font-weight: 700; color: #6e4f1c; list-style: none;
  display:flex; align-items:center; gap:10px; font-size:.96rem; }
.deepdive > summary::-webkit-details-marker { display:none; }
.deepdive > summary::before { content:"⚡"; }
.deepdive > summary::after { content:"›"; margin-left:auto; transition: transform .2s; font-size:1.3rem; line-height:0; }
.deepdive[open] > summary::after { transform: rotate(90deg); }
.deepdive[open] > summary { border-bottom:1px solid #ead7b6; }
.deepdive .dd-body { padding: 4px 18px 8px; }
.deepdive .dd-body p, .deepdive .dd-body li { font-size: .96rem; color:#5f5235; }
.deepdive .dd-body code { background:#f0e6d2; }

/* steps */
.steps { counter-reset: step; list-style:none; margin: 24px 0; padding:0; }
.steps > li { position: relative; padding: 4px 0 22px 52px; border-left: 2px dashed var(--paper-edge); margin-left: 16px; }
.steps > li:last-child { border-left-color: transparent; padding-bottom: 0; }
.steps > li::before { counter-increment: step; content: counter(step); position:absolute; left:-17px; top:-2px;
  width: 32px; height: 32px; border-radius: 50%; background: var(--ink-700); color:#eaf3f8; font-family: var(--f-mono);
  font-weight:700; display:grid; place-items:center; font-size:.92rem; box-shadow: 0 0 0 4px var(--paper); }
.steps > li h4 { margin: 4px 0 6px; }
.steps > li p { font-size:.98rem; margin-bottom: 10px; }

/* code */
.code { background: var(--ink-800); border: 1px solid rgba(120,201,232,.16); border-radius: var(--r);
  margin: 20px 0; overflow: hidden; box-shadow: var(--shadow-1); }
.code__bar { display:flex; align-items:center; gap:8px; padding: 9px 14px; border-bottom: 1px solid rgba(120,201,232,.14);
  background: rgba(120,201,232,.05); }
.code__dot { width:10px; height:10px; border-radius:50%; background:#3a526a; }
.code__name { font-family: var(--f-mono); font-size:.74rem; color:#8aa2b4; margin-left: 4px; }
.code__copy { margin-left:auto; background:none; border:1px solid rgba(120,201,232,.25); color:#9fb6c6;
  border-radius: 6px; font: 600 .72rem var(--f-mono); padding: 4px 9px; cursor:pointer; }
.code__copy:hover { color:#fff; border-color: var(--aqua); }
.code pre { margin:0; padding: 15px 16px; overflow-x:auto; }
.code code { font-family: var(--f-mono); font-size: .86rem; line-height: 1.65; color: #d6e6f1; }
.tok-key { color: #6fd3e2; } .tok-str { color: #f2c178; } .tok-num { color:#b6e08a; }
.tok-com { color:#5d748a; font-style:italic; } .tok-fn { color:#c9a6ff; } .tok-pr { color:#9ab4c8; }

/* inline code */
.unit :not(pre) > code, .ref-main :not(pre) > code { background: var(--paper-2); border:1px solid var(--paper-edge);
  padding: .08em .4em; border-radius: 5px; font-size: .86em; color: #234; }
.kbd { font-family: var(--f-mono); font-size:.8em; background:#fff; border:1px solid var(--paper-edge);
  border-bottom-width:2px; border-radius:5px; padding: .05em .45em; color: var(--tx); }

/* figure / screenshot */
.figure { margin: 24px 0; }
.figure__frame { border-radius: var(--r); overflow: hidden; border: 1px solid var(--paper-edge);
  box-shadow: var(--shadow-2); background: var(--ink-800); }
.figure__frame .ph { aspect-ratio: 16/9; display:grid; place-items:center; color:#6d8298; font-family:var(--f-mono);
  font-size:.82rem; background-image: linear-gradient(135deg, #0e2440 25%, transparent 25%, transparent 50%, #0e2440 50%, #0e2440 75%, transparent 75%); background-size: 20px 20px; }
.figure figcaption { font-size:.84rem; color: var(--tx-mute); margin-top: 9px; padding-left: 4px; }
.figure figcaption b { color: var(--trail-deep); font-family: var(--f-mono); margin-right: 6px; }

/* ---------------------------------------------------- node / flow diagrams - */
.flow { display:flex; flex-wrap:wrap; align-items:center; gap: 8px; margin: 22px 0; padding: 20px;
  background: var(--ink-800); border-radius: var(--r); border:1px solid rgba(120,201,232,.16); }
.node { display:inline-flex; flex-direction:column; min-width: 96px; border-radius: 9px; overflow:hidden;
  box-shadow: var(--shadow-1); border:1px solid rgba(255,255,255,.08); }
.node__h { font-family: var(--f-mono); font-size:.66rem; letter-spacing:.1em; text-transform:uppercase;
  font-weight:700; color:#06121f; padding: 4px 9px; }
.node__b { background: var(--ink-700); color:#dbe8f1; font-size:.8rem; padding: 7px 9px; font-weight:600; }
.flow .arrow { color:#4f6a82; font-size:1.1rem; }
.flow .arrow::after { content:"→"; }
.node.n-start .node__h{background:var(--n-start)} .node.n-query .node__h{background:var(--n-query)}
.node.n-assign .node__h{background:var(--n-assign)} .node.n-cond .node__h{background:var(--n-cond)}
.node.n-loop .node__h{background:var(--n-loop)} .node.n-create .node__h{background:var(--n-create)}
.node.n-update .node__h{background:var(--n-update)} .node.n-delete .node__h{background:var(--n-delete)}
.node.n-notify .node__h{background:var(--n-notify)} .node.n-call .node__h{background:var(--n-call); color:#fff}
.node.n-page .node__h{background:var(--n-page); color:#fff} .node.n-end .node__h{background:var(--n-end)}
.flow--col { flex-direction: column; align-items: stretch; }
.flow--col .arrow::after { content:"↓"; }

/* ----------------------------------------------------------------- quiz --- */
.quiz { background: var(--paper-card); border:1px solid var(--paper-edge); border-radius: var(--r-lg);
  padding: 28px; margin-top: 36px; box-shadow: var(--shadow-1); }
.quiz__head { display:flex; align-items:center; gap:14px; margin-bottom: 6px; }
.quiz__head .seal { width: 46px; height:46px; }
.quiz__q { margin: 22px 0; }
.quiz__q > p { font-weight:700; color: var(--tx); font-size:1.04rem; }
.quiz__q .qn { font-family: var(--f-mono); color: var(--trail-deep); margin-right:8px; }
.quiz__opts { display:grid; gap: 9px; }
.opt { display:flex; gap:11px; align-items:flex-start; padding: 12px 14px; border:1.5px solid var(--paper-edge);
  border-radius: var(--r); cursor:pointer; background:#fff; transition: border-color .15s, background .15s; font-size:.98rem; }
.opt:hover { border-color: var(--aqua); }
.opt input { margin-top: 3px; accent-color: var(--aqua-deep); }
.opt.correct { border-color: var(--done); background:#eafbf2; }
.opt.wrong { border-color: var(--danger); background:#fdeeea; }
.opt.correct::after { content:"✓"; margin-left:auto; color: var(--done-deep); font-weight:700; }
.opt.wrong::after { content:"✕"; margin-left:auto; color: var(--danger); font-weight:700; }
.quiz__actions { display:flex; align-items:center; gap:14px; margin-top: 18px; flex-wrap:wrap; }
.quiz__result { font-weight:700; }
.quiz__result.pass { color: var(--done-deep); } .quiz__result.fail { color: var(--danger); }

/* badge award banner */
.badge-award { display:none; margin-top: 26px; padding: 24px; border-radius: var(--r-lg); align-items:center; gap: 22px;
  background: linear-gradient(110deg, var(--ink-800), var(--ink-700)); border:1px solid var(--seal); color:#eaf3f8;
  box-shadow: var(--shadow-blue); }
.badge-award.show { display:flex; animation: fadeUp .5s ease; }
.badge-award .seal { width: 78px; height:78px; }
.badge-award h3 { color:#fff; margin:0 0 4px; }
.badge-award p { color:#bcd0de; margin:0; }
.badge-award .pts { font-family: var(--f-mono); color: var(--trail); font-weight:700; }

/* unit nav (prev/next + mark complete) */
.unit-nav { display:flex; align-items:center; gap: 14px; margin-top: 40px; padding-top: 24px; border-top:1px solid var(--paper-line); }
.unit-nav .spacer { flex:1; }
.btn--complete { background: var(--done); color:#fff; box-shadow: 0 8px 20px rgba(47,174,116,.3); }
.btn--complete.is-done { background: var(--paper-2); color: var(--done-deep); box-shadow:none; cursor: default; }
.btn--complete.is-done::before { content:"✓ "; }

/* =========================================================== REFERENCE ==== */
.ref-hero { padding: clamp(34px,5vw,56px) 0; }
.ref-hero h1 { color:#f2f8fb; }
.ref-hero .lede { color:#c2d3e0; font-size:1.1rem; max-width: 42em; }
.ref-search-wrap { margin-top: 24px; max-width: 540px; position: relative; }
.ref-search { width:100%; padding: 14px 16px 14px 44px; border-radius: 999px; border:1px solid rgba(120,201,232,.3);
  background: rgba(8,22,39,.5); color:#eaf3f8; font: 500 1rem var(--f-ui); }
.ref-search::placeholder { color:#7e93a6; }
.ref-search:focus { outline:none; border-color: var(--aqua-bright); box-shadow: 0 0 0 4px rgba(43,184,203,.18); }
.ref-search-wrap::before { content:"⌕"; position:absolute; left:16px; top:50%; transform:translateY(-50%); color: var(--aqua-bright); font-size:1.3rem; }

.ref-layout { display:grid; grid-template-columns: 230px 1fr; gap: 40px; max-width: var(--maxw);
  margin: 0 auto; padding: 36px clamp(18px,4vw,40px) 90px; align-items:start; }
.ref-rail { position: sticky; top: 78px; max-height: calc(100vh - 96px); overflow:auto; }
.ref-rail h5 { font-family: var(--f-mono); font-size:.72rem; letter-spacing:.16em; text-transform:uppercase; color: var(--tx-mute); margin: 14px 0 6px; }
.cat-nav { list-style:none; margin:0; padding:0; }
.cat-nav a { display:flex; justify-content:space-between; gap:8px; padding: 7px 11px; border-radius: var(--r-sm);
  color: var(--tx-soft); font-size:.9rem; font-weight:600; }
.cat-nav a:hover { background: var(--paper-2); text-decoration:none; }
.cat-nav a.is-active { background: rgba(43,184,203,.12); color: var(--tx); box-shadow: inset 2px 0 0 var(--aqua); }
.cat-nav a .ct { font-family: var(--f-mono); color: var(--tx-faint); font-size:.78rem; }

.ref-main { min-width: 0; }
.ref-cat { margin-bottom: 44px; scroll-margin-top: 80px; }
.ref-cat__head { display:flex; align-items:baseline; gap:12px; padding-bottom:10px; margin-bottom:18px; border-bottom: 2px solid var(--paper-edge); }
.ref-cat__head h2 { margin:0; }
.ref-cat__head .ct { font-family:var(--f-mono); color: var(--tx-mute); font-size:.9rem; }
.fn-grid { display:grid; gap: 16px; }
.fn-card { background: var(--paper-card); border:1px solid var(--paper-edge); border-radius: var(--r); padding: 18px 20px;
  box-shadow: var(--shadow-1); scroll-margin-top: 80px; }
.fn-card__head { display:flex; align-items:center; gap:10px; flex-wrap:wrap; margin-bottom: 8px; }
.fn-card__head h4 { margin:0; font-family: var(--f-ui); font-weight:800; }
.fn-name { font-family: var(--f-mono); font-size:.84rem; color: var(--aqua-deep); background: rgba(43,184,203,.1);
  padding: 2px 8px; border-radius: 6px; }
.chip { font-family: var(--f-mono); font-size:.68rem; font-weight:700; letter-spacing:.06em; text-transform:uppercase;
  padding: 3px 8px; border-radius: 999px; }
.chip--ret { background: #eef2f6; color: var(--tx-soft); border:1px solid var(--paper-edge); }
.chip--cat { background: rgba(242,168,60,.16); color: var(--trail-deep); }
.chip--mem { margin-left:auto; background: var(--paper-2); color: var(--tx-mute); }
.fn-card p.fn-desc { color: var(--tx-soft); font-size:.95rem; margin: 6px 0 12px; white-space: pre-line; }
.fn-sig { font-family: var(--f-mono); font-size:.84rem; background: var(--ink-800); color:#d6e6f1; padding: 10px 13px;
  border-radius: var(--r-sm); overflow-x:auto; margin: 0 0 12px; }
.fn-sig .fn-sig-name { color: var(--aqua-bright); } .fn-sig .fn-sig-arg { color: #f2c178; }
.params { width:100%; border-collapse:collapse; font-size:.88rem; margin-bottom: 4px; }
.params th { text-align:left; font-family: var(--f-mono); font-size:.7rem; letter-spacing:.08em; text-transform:uppercase;
  color: var(--tx-mute); border-bottom:1px solid var(--paper-edge); padding: 5px 10px 5px 0; font-weight:700; }
.params td { padding: 6px 10px 6px 0; border-bottom:1px solid var(--paper-line); color: var(--tx-soft); vertical-align: top; }
.params td.pname { font-family: var(--f-mono); color: var(--tx); white-space:nowrap; }
.params td.ptype { font-family: var(--f-mono); color: var(--aqua-deep); font-size:.82rem; }
.fn-none { color: var(--tx-mute); font-size:.86rem; padding: 8px 0; }
.fn-example { margin-top: 12px; }
.fn-example__label { font-family: var(--f-mono); font-size:.62rem; letter-spacing:.14em; text-transform:uppercase; color: var(--trail-deep); font-weight:700; margin-bottom:5px; }
.ref-main .fn-example code { display:block; font-family: var(--f-mono); font-size:.82rem; line-height:1.55; background: var(--ink-800);
  color:#d6e6f1; padding: 9px 12px; border-radius: var(--r-sm); overflow-x:auto; white-space:pre-wrap; word-break:break-word;
  border:1px solid rgba(120,201,232,.14); }
.ref-empty { text-align:center; padding: 60px 20px; color: var(--tx-mute); }

/* ---------------------------------------------------------------- footer --- */
.aw-footer { padding: 40px 0; border-top: 1px solid rgba(120,201,232,.14); color:#8aa2b4; font-size:.86rem; }
.aw-footer__in { max-width: var(--maxw); margin:0 auto; padding:0 clamp(18px,4vw,40px); display:flex; gap:18px; flex-wrap:wrap; align-items:center; }
.aw-footer a { color: var(--aqua-bright); }
.aw-footer .aw-spacer { flex:1; }

/* ------------------------------------------------------------- utilities --- */
.center { text-align:center; }
.mt-0{margin-top:0} .mb-0{margin-bottom:0}
.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(20px); opacity:0;
  background: var(--ink-800); color:#eaf3f8; padding: 12px 20px; border-radius: 999px; border:1px solid var(--seal);
  box-shadow: var(--shadow-blue); font-weight:600; font-size:.9rem; z-index: 100; transition: all .3s ease; pointer-events:none; }
.toast.show { opacity:1; transform: translateX(-50%) translateY(0); }

/* ----------------------------------------------------------- responsive --- */
@media (max-width: 940px) {
  .hero__in { grid-template-columns: 1fr; gap: 30px; }
  .hero__map { max-width: 420px; margin: 0 auto; width:100%; }
  .tracks { grid-template-columns: 1fr; }
  .module-layout, .ref-layout { grid-template-columns: 1fr; }
  .unit-rail, .ref-rail { position: static; max-height:none; }
  .stat-strip { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .aw-topbar__in { flex-wrap: wrap; gap: 12px; }
  .aw-nav { display: flex; order: 3; width: 100%; overflow-x: auto; -webkit-overflow-scrolling: touch; gap: 6px; margin-left: 0; scrollbar-width: none; }
  .aw-nav::-webkit-scrollbar { display: none; }
  .aw-nav a { display: flex; align-items: center; white-space: nowrap; min-height: 44px; }
  .cat-nav a, .unit-list a { min-height: 44px; align-items: center; }
  .aw-reset { min-height: 44px; min-width: 44px; padding: 10px; }
  .stat-strip { grid-template-columns: 1fr 1fr; }
  .steps > li { padding-left: 44px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .001ms !important; transition-duration: .001ms !important; }
  html { scroll-behavior: auto !important; }
  .route-path { stroke-dashoffset: 0 !important; }
}

/* ----------------------------------------------------- accessibility (a11y) */
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible,
textarea:focus-visible, summary:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--aqua-bright); outline-offset: 2px; border-radius: 4px;
}
.opt:focus-within { outline: 2px solid var(--aqua); outline-offset: 2px; }
.module-card:focus-visible, .track-card:focus-visible { outline-offset: 3px; border-radius: var(--r-lg); }
/* darker on-paper section/label accents for AA contrast (dark .bp labels keep their inline colours) */
.eyebrow, .u-kicker, .fn-example__label, .quiz__q .qn { color: #b1481f; }
/* make in-prose links self-evident without relying on colour alone */
.unit a:not(.btn), .ref-main a:not(.btn), .g-see a { text-decoration: underline; text-underline-offset: 2px; }