/* ============================================================
   LEARNING CLAUDE.AI — Navigator's Atlas design system
   Display: Bricolage Grotesque · Body: Albert Sans · Utility: Spline Sans Mono
   ============================================================ */

:root{
  --ink:#0B1420;          /* deep night-chart blue */
  --ink-2:#101B2C;
  --ink-3:#16233A;
  --line:rgba(148,180,220,.14);
  --line-strong:rgba(148,180,220,.28);
  --paper:#EAF1F9;        /* primary text */
  --paper-dim:#A7B8CC;
  --paper-faint:#6E8199;
  --gold:#F3C77B;         /* atlas gilt accent */

  /* Realm colors */
  --c-conversations:#FFB454;
  --c-organization:#2DD4BF;
  --c-memory:#A78BFA;
  --c-production:#FF7A6B;
  --c-agents:#5EA8FF;
  --c-sources:#4ADE80;
  --c-scaling:#F472B6;

  --radius:14px;
  --radius-lg:22px;
  --font-display:"Bricolage Grotesque", "Albert Sans", sans-serif;
  --font-body:"Albert Sans", system-ui, sans-serif;
  --font-mono:"Spline Sans Mono", ui-monospace, monospace;
  --maxw:1120px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:
    radial-gradient(1200px 700px at 80% -10%, rgba(94,168,255,.08), transparent 60%),
    radial-gradient(900px 600px at -10% 30%, rgba(167,139,250,.06), transparent 60%),
    var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}

/* Faint chart-grid backdrop */
body::before{
  content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image:
    linear-gradient(rgba(148,180,220,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148,180,220,.045) 1px, transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(ellipse at 50% 20%, black 30%, transparent 80%);
}

main, header.site, footer.site{position:relative;z-index:1}

a{color:inherit}
img,svg{max-width:100%}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- Top navigation ---------- */
header.site{
  position:sticky;top:0;z-index:50;
  background:rgba(11,20,32,.82);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;gap:18px;height:64px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-family:var(--font-display);font-weight:700;font-size:1.05rem;letter-spacing:.01em}
.brand .rose{width:30px;height:30px;flex:none}
.brand em{font-style:normal;color:var(--gold)}
.nav-links{margin-left:auto;display:flex;gap:6px;flex-wrap:wrap}
.nav-links a{
  text-decoration:none;font-family:var(--font-mono);font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;
  color:var(--paper-dim);padding:8px 12px;border-radius:999px;border:1px solid transparent;
}
.nav-links a:hover{color:var(--paper);border-color:var(--line-strong)}
.nav-links a.active{color:var(--ink);background:var(--gold);border-color:var(--gold);font-weight:600}

/* Realm dot in nav */
.nav-links a .dot{display:inline-block;width:8px;height:8px;border-radius:50%;margin-right:7px;vertical-align:1px;background:var(--realm, var(--gold))}

/* ---------- Typography ---------- */
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.12;margin:0 0 .4em}
h1{font-size:clamp(2.2rem,5.4vw,3.6rem);font-weight:800;letter-spacing:-.015em}
h2{font-size:clamp(1.5rem,3vw,2.1rem);font-weight:700}
h3{font-size:1.22rem;font-weight:700}
p{margin:.35em 0 1em}
.lede{font-size:clamp(1.05rem,2vw,1.25rem);color:var(--paper-dim);max-width:62ch}
.eyebrow{
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.22em;text-transform:uppercase;
  color:var(--gold);display:inline-flex;align-items:center;gap:10px;margin-bottom:14px;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--gold);display:inline-block}
strong{color:var(--paper)}
code,kbd{font-family:var(--font-mono);font-size:.86em;background:var(--ink-3);border:1px solid var(--line);border-radius:6px;padding:1px 6px;color:var(--gold)}

/* ---------- Sections ---------- */
section{padding:72px 0}
.section-head{max-width:70ch;margin-bottom:34px}

/* ---------- Hero ---------- */
.hero{padding:84px 0 40px;position:relative;overflow:hidden}
.hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
.hero-copy .cta-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px}
.btn{
  display:inline-flex;align-items:center;gap:10px;text-decoration:none;font-weight:600;
  font-family:var(--font-display);font-size:.98rem;
  padding:13px 22px;border-radius:999px;border:1px solid var(--line-strong);color:var(--paper);
  transition:transform .15s ease, background .15s ease;
}
.btn.primary{background:var(--gold);border-color:var(--gold);color:var(--ink)}
.btn:hover{transform:translateY(-2px)}
.btn .arr{font-family:var(--font-mono)}

/* ---------- Compass map ---------- */
.compass-wrap{position:relative}
.compass-svg{width:100%;height:auto;display:block}
.compass-svg .spoke{stroke:var(--line-strong);stroke-dasharray:3 5}
.compass-svg .node{cursor:pointer}
.compass-svg .node circle.halo{transition:r .18s ease, opacity .18s ease;opacity:.16}
.compass-svg .node:hover circle.halo{opacity:.34}
.compass-svg .node:hover .node-label{fill:var(--paper)}
.compass-svg text{font-family:var(--font-mono)}
.compass-svg .node-letter{font-family:var(--font-display);font-weight:800}
.compass-svg .node-label{fill:var(--paper-dim);font-size:11.5px;letter-spacing:.08em;text-transform:uppercase}
.compass-svg .prog-arc{fill:none;stroke-linecap:round;opacity:.95}
.compass-svg .prog-track{fill:none;stroke:rgba(148,180,220,.16)}
.compass-caption{
  text-align:center;font-family:var(--font-mono);font-size:.78rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--paper-faint);margin-top:10px;
}

/* ---------- Realm cards on index ---------- */
.realm-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:18px}
.realm-card{
  --realm:var(--gold);
  position:relative;display:block;text-decoration:none;color:inherit;
  background:linear-gradient(180deg, var(--ink-2), var(--ink));
  border:1px solid var(--line);border-radius:var(--radius-lg);padding:26px 24px 22px;
  overflow:hidden;transition:transform .18s ease, border-color .18s ease;
}
.realm-card::before{content:"";position:absolute;inset:0 auto 0 0;width:5px;background:var(--realm)}
.realm-card:hover{transform:translateY(-4px);border-color:var(--realm)}
.realm-card .letter{
  font-family:var(--font-display);font-weight:800;font-size:2.1rem;color:var(--realm);
  line-height:1;margin-bottom:8px;
}
.realm-card h3{margin-bottom:4px}
.realm-card .mn{font-family:var(--font-mono);font-size:.78rem;color:var(--paper-faint);letter-spacing:.05em;margin-bottom:12px}
.realm-card .mn b{color:var(--realm);font-weight:600}
.realm-card p{color:var(--paper-dim);font-size:.95rem;margin:0 0 16px}
.realm-card .prog{display:flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:.75rem;color:var(--paper-faint)}
.realm-card .bar{flex:1;height:5px;border-radius:99px;background:var(--ink-3);overflow:hidden}
.realm-card .bar i{display:block;height:100%;width:0%;background:var(--realm);border-radius:99px;transition:width .5s ease}

/* ---------- How-to-learn steps ---------- */
.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:18px;counter-reset:step}
.step{background:var(--ink-2);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.step .n{font-family:var(--font-mono);color:var(--gold);font-size:.8rem;letter-spacing:.18em;margin-bottom:10px}
.step p{color:var(--paper-dim);font-size:.94rem;margin:0}

/* ---------- Realm page hero ---------- */
.realm-hero{--realm:var(--gold);padding:70px 0 34px;border-bottom:1px solid var(--line);
  background:linear-gradient(180deg, color-mix(in srgb, var(--realm) 9%, transparent), transparent 70%)}
.realm-hero .wrap{display:grid;grid-template-columns:auto 1fr;gap:34px;align-items:center}
.realm-glyph{
  width:118px;height:118px;border-radius:28px;flex:none;
  display:grid;place-items:center;
  background:color-mix(in srgb, var(--realm) 14%, var(--ink-2));
  border:1px solid color-mix(in srgb, var(--realm) 45%, transparent);
  font-family:var(--font-display);font-weight:800;font-size:3.4rem;color:var(--realm);
  box-shadow:0 0 60px color-mix(in srgb, var(--realm) 18%, transparent);
}
.realm-hero .mnemonic-line{
  font-family:var(--font-mono);font-size:.85rem;letter-spacing:.06em;color:var(--paper-dim);
  border:1px dashed color-mix(in srgb, var(--realm) 45%, transparent);
  border-radius:999px;padding:8px 16px;display:inline-block;margin-top:8px;
}
.realm-hero .mnemonic-line b{color:var(--realm)}
.realm-progress{margin-top:18px;display:flex;align-items:center;gap:12px;max-width:420px;
  font-family:var(--font-mono);font-size:.78rem;color:var(--paper-faint)}
.realm-progress .bar{flex:1;height:6px;border-radius:99px;background:var(--ink-3);overflow:hidden}
.realm-progress .bar i{display:block;height:100%;width:0%;background:var(--realm);border-radius:99px;transition:width .5s ease}

/* ---------- Topic accordions ---------- */
.topics{padding:52px 0 30px}
.topic{
  --realm:var(--gold);
  border:1px solid var(--line);border-radius:var(--radius-lg);
  background:var(--ink-2);margin-bottom:14px;overflow:hidden;
  transition:border-color .18s ease;
}
.topic.open{border-color:color-mix(in srgb, var(--realm) 55%, transparent)}
.topic-head{
  display:flex;align-items:center;gap:18px;width:100%;
  background:none;border:0;color:inherit;text-align:left;cursor:pointer;
  padding:20px 22px;font-family:var(--font-body);
}
.topic-head .chip{
  flex:none;width:52px;height:52px;border-radius:14px;display:grid;place-items:center;
  background:color-mix(in srgb, var(--realm) 13%, var(--ink-3));
  color:var(--realm);font-family:var(--font-display);font-weight:800;font-size:1.5rem;
  border:1px solid color-mix(in srgb, var(--realm) 35%, transparent);
}
.topic-head .t{flex:1;min-width:0}
.topic-head .kw{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.18em;text-transform:uppercase;color:var(--realm)}
.topic-head h3{margin:.15em 0 .1em;font-size:1.15rem}
.topic-head .hook{color:var(--paper-dim);font-size:.92rem;margin:0}
.topic-head .state{flex:none;display:flex;align-items:center;gap:12px}
.topic-head .done-badge{
  display:none;font-family:var(--font-mono);font-size:.68rem;letter-spacing:.1em;
  color:var(--ink);background:var(--realm);padding:4px 10px;border-radius:99px;font-weight:600;
}
.topic.learned .done-badge{display:inline-block}
.topic-head .caret{transition:transform .2s ease;color:var(--paper-faint);font-family:var(--font-mono)}
.topic.open .caret{transform:rotate(90deg)}

.topic-body{display:none;padding:0 22px 24px}
.topic.open .topic-body{display:block}

/* Depth tabs */
.depth-tabs{display:flex;gap:8px;margin:4px 0 18px;flex-wrap:wrap}
.depth-tabs button{
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.1em;text-transform:uppercase;
  background:var(--ink-3);color:var(--paper-dim);border:1px solid var(--line);
  border-radius:999px;padding:8px 16px;cursor:pointer;
}
.depth-tabs button.active{background:var(--realm);border-color:var(--realm);color:var(--ink);font-weight:600}
.depth-pane{display:none;animation:fadein .25s ease}
.depth-pane.active{display:block}
@keyframes fadein{from{opacity:0;transform:translateY(4px)}to{opacity:1;transform:none}}
.depth-pane p, .depth-pane li{color:var(--paper-dim);font-size:.97rem}
.depth-pane ul{padding-left:20px;margin:.4em 0 1em}
.depth-pane li{margin:.35em 0}
.depth-pane .callout{
  border-left:3px solid var(--realm);background:color-mix(in srgb, var(--realm) 7%, var(--ink-3));
  border-radius:0 10px 10px 0;padding:12px 16px;margin:14px 0;font-size:.93rem;color:var(--paper-dim);
}
.depth-pane .callout b{color:var(--realm)}

/* Mission block */
.mission{
  border:1px dashed color-mix(in srgb, var(--realm) 50%, transparent);
  border-radius:var(--radius);padding:16px 18px;margin:6px 0 14px;
  background:color-mix(in srgb, var(--realm) 5%, transparent);
}
.mission .tag{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;color:var(--realm);margin-bottom:8px}
.mission ol{padding-left:20px;margin:.3em 0}
.mission li{margin:.3em 0;color:var(--paper-dim);font-size:.95rem}
.reflect{font-size:.9rem;color:var(--paper-faint);font-style:italic;margin-top:10px}

/* Mark learned */
.learn-toggle{
  display:inline-flex;align-items:center;gap:10px;margin-top:16px;cursor:pointer;
  font-family:var(--font-mono);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--paper-dim);background:var(--ink-3);border:1px solid var(--line);
  border-radius:999px;padding:10px 18px;transition:all .15s ease;
}
.learn-toggle:hover{border-color:var(--realm);color:var(--paper)}
.topic.learned .learn-toggle{background:var(--realm);border-color:var(--realm);color:var(--ink);font-weight:600}

/* ---------- Acrostic recap ---------- */
.acrostic{
  --realm:var(--gold);
  border:1px solid var(--line);border-radius:var(--radius-lg);
  background:var(--ink-2);padding:30px 28px;margin:20px 0 50px;
}
.acrostic h3{color:var(--realm)}
.acrostic .rows{display:grid;gap:6px;margin-top:16px}
.acrostic .row{display:grid;grid-template-columns:44px 150px 1fr;gap:14px;align-items:baseline;
  padding:8px 10px;border-radius:10px}
.acrostic .row:nth-child(odd){background:rgba(148,180,220,.04)}
.acrostic .L{font-family:var(--font-display);font-weight:800;font-size:1.4rem;color:var(--realm)}
.acrostic .K{font-family:var(--font-mono);font-size:.8rem;letter-spacing:.1em;text-transform:uppercase;color:var(--paper)}
.acrostic .D{color:var(--paper-dim);font-size:.92rem}

/* ---------- Prev/next footer nav ---------- */
.pager{display:grid;grid-template-columns:1fr 1fr;gap:16px;padding:10px 0 70px}
.pager a{
  text-decoration:none;border:1px solid var(--line);border-radius:var(--radius);
  padding:18px 20px;background:var(--ink-2);transition:border-color .15s ease, transform .15s ease;
}
.pager a:hover{transform:translateY(-3px);border-color:var(--line-strong)}
.pager .dir{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;color:var(--paper-faint)}
.pager .name{font-family:var(--font-display);font-weight:700;margin-top:4px}
.pager a.next{text-align:right}

/* ---------- Vault (flip cards & quiz) ---------- */
.vault-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:18px}
.flip{perspective:1100px;height:230px;cursor:pointer}
.flip-inner{position:relative;width:100%;height:100%;transition:transform .55s cubic-bezier(.2,.7,.3,1);transform-style:preserve-3d}
.flip.flipped .flip-inner{transform:rotateY(180deg)}
.flip-face{
  position:absolute;inset:0;backface-visibility:hidden;border-radius:var(--radius-lg);
  border:1px solid var(--line);padding:24px;display:flex;flex-direction:column;justify-content:center;
}
.flip-front{background:var(--ink-2)}
.flip-front .big{font-family:var(--font-display);font-weight:800;font-size:2.2rem;color:var(--realm,var(--gold))}
.flip-front .q{color:var(--paper-dim);font-size:.92rem;margin-top:6px}
.flip-back{transform:rotateY(180deg);background:color-mix(in srgb, var(--realm,var(--gold)) 10%, var(--ink-2))}
.flip-back ul{margin:0;padding-left:2px;list-style:none;font-size:.85rem;line-height:1.5}
.flip-back li b{color:var(--realm,var(--gold));font-family:var(--font-mono);margin-right:6px}
.flip-hint{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;color:var(--paper-faint);margin-top:12px}

/* Quiz */
.quiz{border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--ink-2);padding:30px;margin-top:26px}
.quiz .qtext{font-family:var(--font-display);font-weight:700;font-size:1.2rem;margin-bottom:16px}
.quiz .opts{display:grid;gap:10px}
.quiz .opts button{
  text-align:left;background:var(--ink-3);border:1px solid var(--line);border-radius:12px;
  color:var(--paper-dim);padding:13px 16px;font-family:var(--font-body);font-size:.96rem;cursor:pointer;
  transition:border-color .12s ease;
}
.quiz .opts button:hover{border-color:var(--line-strong);color:var(--paper)}
.quiz .opts button.correct{border-color:var(--c-sources);background:color-mix(in srgb,var(--c-sources) 12%, var(--ink-3));color:var(--paper)}
.quiz .opts button.wrong{border-color:var(--c-production);background:color-mix(in srgb,var(--c-production) 12%, var(--ink-3))}
.quiz .meta{display:flex;justify-content:space-between;align-items:center;margin-top:18px;
  font-family:var(--font-mono);font-size:.78rem;color:var(--paper-faint)}
.quiz .nextq{display:none}
.quiz .nextq.show{display:inline-flex}

/* ---------- Master progress ring (index) ---------- */
.progress-panel{display:grid;grid-template-columns:auto 1fr;gap:34px;align-items:center;
  border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--ink-2);padding:30px}
.ring{width:150px;height:150px}
.ring .track{fill:none;stroke:var(--ink-3);stroke-width:10}
.ring .fill{fill:none;stroke:var(--gold);stroke-width:10;stroke-linecap:round;transition:stroke-dashoffset .7s ease}
.ring text{font-family:var(--font-display);font-weight:800;fill:var(--paper);font-size:30px}
.progress-panel .note{color:var(--paper-dim);font-size:.95rem;margin:0}
.reset-link{font-family:var(--font-mono);font-size:.72rem;color:var(--paper-faint);background:none;border:none;cursor:pointer;text-decoration:underline;padding:0;margin-top:10px}

/* ---------- Footer ---------- */
footer.site{border-top:1px solid var(--line);padding:34px 0;margin-top:20px}
footer.site .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-family:var(--font-mono);font-size:.74rem;letter-spacing:.06em;color:var(--paper-faint)}
footer.site a{color:var(--paper-dim)}

/* ---------- Responsive ---------- */
@media (max-width:900px){
  .hero .wrap{grid-template-columns:1fr}
  .realm-hero .wrap{grid-template-columns:1fr;gap:20px}
  .progress-panel{grid-template-columns:1fr;text-align:center}
  .ring{margin:0 auto}
  .acrostic .row{grid-template-columns:36px 1fr;grid-template-rows:auto auto}
  .acrostic .D{grid-column:2}
}
@media (max-width:620px){
  section{padding:52px 0}
  .topic-head{gap:12px;padding:16px 14px}
  .topic-head .hook{display:none}
  .pager{grid-template-columns:1fr}
  .pager a.next{text-align:left}
  .nav-links a{padding:6px 8px;font-size:.7rem}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;animation:none!important;scroll-behavior:auto!important}
}

/* Focus visibility */
a:focus-visible,button:focus-visible{outline:2px solid var(--gold);outline-offset:2px;border-radius:6px}

/* ---- free/paid split ---- */
.lock-badge{position:absolute;top:14px;right:14px;font-family:var(--mono);font-size:.62rem;
  letter-spacing:.12em;text-transform:uppercase;color:var(--gold);
  border:1px solid rgba(243,199,123,.4);border-radius:99px;padding:4px 10px;
  background:rgba(243,199,123,.07)}
.realm-card{position:relative}
.free-banner{background:linear-gradient(90deg,rgba(243,199,123,.14),rgba(243,199,123,.05));
  border-bottom:1px solid rgba(243,199,123,.3);padding:11px 0;font-size:.92rem;
  color:var(--ink-soft);text-align:center}
.free-banner a{color:var(--gold);font-weight:600}

/* ---- opt-in block ---- */
.optin-sec{padding:26px 0 64px}
.optin{display:grid;grid-template-columns:1fr 1.2fr;gap:36px;align-items:start;
  border:1px solid rgba(148,180,220,.22);border-radius:18px;padding:34px 38px;
  background:linear-gradient(140deg,rgba(23,36,56,.85),rgba(13,22,36,.9))}
.optin-form{display:grid;gap:14px}
.fld{display:grid;gap:6px}
.fld span{font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft)}
.fld input{background:#0D1726;border:1px solid rgba(148,180,220,.28);border-radius:10px;
  padding:12px 14px;color:var(--ink);font:inherit}
.fld input:focus{outline:2px solid var(--gold);outline-offset:1px;border-color:transparent}
.switch-row{display:grid;grid-template-columns:auto 1fr;gap:14px;align-items:start;cursor:pointer;margin-top:4px}
.switch-input{position:absolute;opacity:0;width:0;height:0}
.switch{width:52px;height:28px;border-radius:99px;background:#22334D;position:relative;
  transition:background .2s;flex-shrink:0;border:1px solid rgba(148,180,220,.3);margin-top:2px}
.switch::after{content:"";position:absolute;top:3px;left:3px;width:20px;height:20px;border-radius:50%;
  background:#8AA3C4;transition:transform .2s,background .2s}
.switch-input:checked + .switch{background:rgba(243,199,123,.85);border-color:var(--gold)}
.switch-input:checked + .switch::after{transform:translateX(24px);background:#0B1420}
.switch-input:focus-visible + .switch{outline:2px solid var(--gold);outline-offset:2px}
.switch-label{font-size:.92rem;color:var(--ink-soft);line-height:1.55}
.optin-btn[disabled]{opacity:.38;cursor:not-allowed;filter:grayscale(.4)}
.optin-fine{font-size:.76rem;color:rgba(138,163,196,.75);line-height:1.5;margin-top:2px}
@media(max-width:860px){.optin{grid-template-columns:1fr;padding:26px 22px}}