:root{
  --indigo:#4F46E5; --navy:#1E1B4B; --ink:#1f2230; --muted:#5b6172;
  --bg:#f7f8fc; --panel:#ffffff; --line:#e6e8f0; --code:#0f1226;
  --ok:#0f9d58; --warn:#d9822b; --chance:#c0392b;
  --grad:linear-gradient(90deg,#6366f1,#4F46E5 60%,#4338ca);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);background:var(--bg);line-height:1.55;-webkit-font-smoothing:antialiased}
.wrap{max-width:920px;margin:0 auto;padding:0 24px}
code{font-family:"SF Mono",ui-monospace,Menlo,Consolas,monospace;font-size:.9em;
  background:#eef0f8;padding:.08em .35em;border-radius:5px;color:#33365a}
a{color:var(--indigo);text-decoration:none}
a:hover{text-decoration:underline}

/* hero */
.hero{background:var(--navy);color:#e9eaf6;padding:54px 0 46px;border-bottom:4px solid var(--indigo)}
.kicker{font-size:.82rem;letter-spacing:.04em;text-transform:uppercase;color:#a9adde;margin-bottom:14px}
.kicker a{color:#c9cdf6}
.hero h1{font-size:2.9rem;margin:.1em 0 .35em;font-weight:800;letter-spacing:-.02em}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .tag{font-size:1.18rem;max-width:760px;color:#dcdef4;margin:.2em 0 .8em}
.hero .tag em{color:#fff;font-style:normal;font-weight:600}
.hero .sub{font-size:.98rem;color:#b6bae6;max-width:720px}
.hero code{background:#2a2766;color:#dfe1fb}

/* panel */
main{padding:34px 0 10px}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:14px;
  padding:22px 22px 24px;box-shadow:0 1px 3px rgba(20,22,60,.05)}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:8px}
.panel-head h2{margin:0;font-size:1.25rem}
.status{font-size:.82rem;color:var(--muted);background:#f1f2fa;padding:5px 11px;border-radius:20px;white-space:nowrap}
.status.ready{color:var(--ok);background:#e8f6ee}
.status.err{color:var(--chance);background:#fbecea}

.examples{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin:10px 0 4px}
.examples-label{font-size:.85rem;color:var(--muted);margin-right:2px}
.chip{font:inherit;font-size:.84rem;border:1px solid var(--line);background:#fff;color:#33365a;
  padding:6px 12px;border-radius:20px;cursor:pointer;transition:.15s}
.chip:hover{border-color:var(--indigo);color:var(--indigo);background:#f5f5ff}
.note{font-size:.86rem;color:var(--muted);min-height:1.2em;margin:8px 2px 6px;font-style:italic}

textarea{width:100%;min-height:200px;resize:vertical;font-family:"SF Mono",ui-monospace,Menlo,Consolas,monospace;
  font-size:.86rem;line-height:1.5;padding:14px;border:1px solid var(--line);border-radius:10px;
  background:#fcfcff;color:#23263a}
textarea:focus{outline:none;border-color:var(--indigo);box-shadow:0 0 0 3px rgba(79,70,229,.12)}

.controls{display:flex;align-items:center;gap:16px;margin-top:14px;flex-wrap:wrap}
.btn-primary{font:inherit;font-weight:600;font-size:.98rem;color:#fff;background:var(--indigo);
  border:none;padding:11px 22px;border-radius:10px;cursor:pointer;transition:.15s}
.btn-primary:hover:not(:disabled){background:#4338ca}
.btn-primary:disabled{opacity:.5;cursor:not-allowed}
.split{font-size:.86rem;color:var(--muted);display:flex;align-items:center;gap:7px}
.split input{width:62px;font:inherit;padding:6px 8px;border:1px solid var(--line);border-radius:7px}
.err{color:var(--chance);font-size:.85rem}

/* result */
.result{margin-top:26px}
.hidden{display:none}
.result h2{font-size:1.3rem;margin:0 0 4px}
.result .rsub{color:var(--muted);font-size:.9rem;margin:0 0 18px}
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
@media(max-width:680px){.cards{grid-template-columns:1fr}}
.card{border:1px solid var(--line);border-radius:12px;padding:16px 18px;background:#fff}
.card h3{margin:0 0 10px;font-size:.78rem;letter-spacing:.05em;text-transform:uppercase;color:var(--indigo)}
.metric{display:flex;align-items:baseline;gap:10px;margin:2px 0}
.metric .big{font-size:1.7rem;font-weight:700;color:var(--navy);font-variant-numeric:tabular-nums}
.metric .unit{font-size:.85rem;color:var(--muted)}
.metric .sm{font-size:1rem;font-weight:600;color:#33365a;font-variant-numeric:tabular-nums}
.row{font-size:.86rem;color:#41465c;margin:6px 0;font-variant-numeric:tabular-nums}
.row .lab{color:var(--muted)}
.pill{display:inline-block;font-size:.72rem;font-weight:600;padding:2px 9px;border-radius:20px;margin-left:6px}
.pill.ok{background:#e8f6ee;color:var(--ok)}
.pill.chance{background:#fbecea;color:var(--chance)}
.pill.def{background:#eef0f8;color:#5b6172}
.tag-line{font-size:.8rem;color:var(--muted);margin-top:8px}
.bar{height:7px;background:#eef0f8;border-radius:6px;overflow:hidden;margin:8px 0 4px}
.bar > span{display:block;height:100%;background:var(--grad);border-radius:6px}

.caveats{margin-top:18px;border:1px solid #ecdcc4;background:#fffaf0;border-radius:12px;padding:14px 18px}
.caveats h3{margin:0 0 8px;font-size:.82rem;text-transform:uppercase;letter-spacing:.04em;color:var(--warn)}
.caveats ul{margin:0;padding-left:18px}
.caveats li{font-size:.86rem;color:#5a5340;margin:5px 0}

details.raw{margin-top:16px}
details.raw summary{cursor:pointer;font-size:.85rem;color:var(--indigo)}
pre.code,pre.rawout{background:var(--code);color:#d7dbf5;padding:16px;border-radius:10px;overflow-x:auto;
  font-size:.82rem;line-height:1.5;font-family:"SF Mono",ui-monospace,Menlo,Consolas,monospace}
pre.rawout{margin-top:10px}

/* explain */
.explain{margin:46px 0 10px}
.explain h2{font-size:1.45rem;margin:34px 0 14px;letter-spacing:-.01em}
.cards-doc{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
@media(max-width:680px){.cards-doc{grid-template-columns:1fr}}
.card-doc{border:1px solid var(--line);border-radius:12px;padding:16px 18px;background:#fff}
.card-doc h3{margin:0 0 8px;font-size:1rem;color:var(--navy)}
.card-doc p{margin:0;font-size:.92rem;color:#41465c}
.caveats-box{margin:18px 0;border:1px solid #ecdcc4;background:#fffaf0;border-radius:12px;padding:18px 22px}
.caveats-box h3{margin:0 0 8px;color:var(--warn)}
.caveats-box ul{margin:8px 0 0;padding-left:20px}
.caveats-box li{font-size:.93rem;margin:6px 0;color:#5a5340}

footer{padding:30px 0 50px;color:var(--muted);font-size:.85rem;border-top:1px solid var(--line);margin-top:40px}

/* ============================================================== */
/* homepage (theory landing) — shares the design system above     */
/* ============================================================== */
.hero .cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}
.btn-cta{display:inline-block;font-weight:600;font-size:.98rem;padding:11px 22px;border-radius:10px;
  border:1px solid #3a3780;color:#dfe1fb;background:#2a2766;transition:.15s}
.btn-cta:hover{background:#332f7a;text-decoration:none}
.btn-cta.primary{background:var(--indigo);border-color:var(--indigo);color:#fff}
.btn-cta.primary:hover{background:#4338ca}
.btn-cta.big{font-size:1.08rem;padding:14px 28px}

.lead{margin:34px 0 10px}
blockquote.bet{margin:0;padding:18px 22px;border-left:4px solid var(--indigo);background:#fff;
  border:1px solid var(--line);border-left-width:4px;border-radius:0 12px 12px 0;font-size:1.08rem;color:#33365a}
.aside{margin:18px 2px 0;color:var(--muted);font-size:.98rem}

.block{margin:40px 0}
.block h2{font-size:1.5rem;letter-spacing:-.01em;margin:0 0 18px}
.eq-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:760px){.eq-cards{grid-template-columns:1fr}}
.eq-card{border:1px solid var(--line);border-radius:14px;padding:20px;background:#fff;
  box-shadow:0 1px 3px rgba(20,22,60,.05)}
.eq-card .eq{font-family:"SF Mono",ui-monospace,Menlo,Consolas,monospace;font-size:1.15rem;font-weight:600;
  color:var(--navy);background:#eef0fb;border-radius:8px;padding:12px 14px;text-align:center;margin-bottom:14px}
.eq-card h3{margin:0 0 8px;font-size:.78rem;letter-spacing:.05em;text-transform:uppercase;color:var(--indigo)}
.eq-card p{margin:0;font-size:.93rem;color:#41465c}
.note-line{margin-top:16px;font-size:.9rem;color:var(--muted)}

.twocol{display:grid;grid-template-columns:1fr 1fr;gap:24px}
@media(max-width:680px){.twocol{grid-template-columns:1fr;gap:12px}}
.twocol p{margin:0;font-size:.98rem;color:#41465c}

.evidence{background:var(--navy);color:#e9eaf6;border-radius:18px;padding:30px 28px;margin:46px 0}
.evidence h2{color:#fff}
.ev-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media(max-width:760px){.ev-grid{grid-template-columns:1fr}}
.ev{background:#262357;border:1px solid #393680;border-radius:12px;padding:18px}
.ev-num{font-size:1.9rem;font-weight:800;background:var(--grad);-webkit-background-clip:text;
  background-clip:text;color:transparent;font-variant-numeric:tabular-nums;margin-bottom:6px}
.ev p{margin:0;font-size:.9rem;color:#c7cbef}
.evidence code{background:#332f7a;color:#dfe1fb}
.evidence em{color:#fff;font-style:normal;font-weight:600}
.cta-inline{margin:20px 2px 0;color:#c7cbef;font-size:.98rem}
.cta-inline a{color:#fff;text-decoration:underline}

ul.why{margin:0;padding-left:20px}
ul.why li{font-size:.98rem;color:#41465c;margin:10px 0}

.status-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media(max-width:760px){.status-grid{grid-template-columns:1fr}}
.st{border:1px solid var(--line);border-radius:12px;padding:16px 18px;background:#fff;border-top:3px solid}
.st h3{margin:0 0 8px;font-size:.95rem}
.st p{margin:0;font-size:.9rem;color:#41465c}
.st.proven{border-top-color:var(--ok)} .st.proven h3{color:var(--ok)}
.st.conj{border-top-color:var(--warn)} .st.conj h3{color:var(--warn)}
.st.open{border-top-color:var(--muted)} .st.open h3{color:var(--muted)}
.whatsnew{margin-top:18px;font-size:.93rem;color:#5a5340;background:#fffaf0;border:1px solid #ecdcc4;
  border-radius:12px;padding:14px 18px}

.cta-band{text-align:center;margin:54px 0 20px;padding:34px 24px;border:1px solid var(--line);
  border-radius:18px;background:linear-gradient(180deg,#fff,#f4f5fe)}
.cta-band h2{margin:0 0 10px;font-size:1.5rem}
.cta-band p{max-width:620px;margin:0 auto 20px;color:#41465c}
footer .fine{font-size:.8rem;color:var(--muted);margin-top:6px}

/* brand mark + docs read-cards */
.brandmark{display:block;margin-bottom:14px;border-radius:14px;
  box-shadow:0 6px 20px rgba(79,70,229,.35)}
.read-intro{color:var(--muted);max-width:760px;margin:0 0 18px}
.read-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
@media(max-width:680px){.read-grid{grid-template-columns:1fr}}
.read-card{display:block;border:1px solid var(--line);border-radius:12px;padding:16px 18px;background:#fff;
  transition:.15s}
.read-card:hover{border-color:var(--indigo);box-shadow:0 4px 14px rgba(79,70,229,.12);text-decoration:none;
  transform:translateY(-1px)}
.read-card.primary{background:linear-gradient(180deg,#f5f5ff,#eef0fb);border-color:#d9dcf6}
.read-card .rk{display:block;font-size:.72rem;letter-spacing:.05em;text-transform:uppercase;color:var(--indigo);
  font-weight:600;margin-bottom:5px}
.read-card .rt{display:block;font-size:1.06rem;font-weight:700;color:var(--navy);margin-bottom:5px}
.read-card .rd{display:block;font-size:.88rem;color:#41465c}
.read-order{margin-top:16px;font-size:.9rem;color:var(--muted)}

/* ── FAQ page ───────────────────────────────────────────────────────────── */
.hero-slim{padding:40px 0 34px}
.hero-slim h1{font-size:2.3rem}
.faq-item{margin:34px 0;padding-bottom:30px;border-bottom:1px solid var(--line)}
.faq-item:last-of-type{border-bottom:none}
.faq-item h2{font-size:1.32rem;color:var(--navy);margin:0 0 14px;letter-spacing:-.01em;line-height:1.3}
.faq-item h3{font-size:1.02rem;color:var(--ink);margin:22px 0 8px}
.faq-item p{margin:0 0 12px;color:#2a2e40}
.faq-item ol,.faq-item ul{padding-left:22px;margin:10px 0 14px}
.faq-item li{margin:9px 0;color:#2a2e40}
.faq-item blockquote.bet{margin:16px 0}
.yes{color:var(--ok);font-weight:700}
.no{color:var(--chance);font-weight:700}
.disclosure{margin:36px 0 8px;padding:16px 20px;background:#eef0fb;border:1px solid #d9dcf6;
  border-radius:12px;font-size:.9rem;color:#41465c}