:root{
    /* warm editorial light theme */
    --paper:#FBF7EC; --paper2:#F4EEDD; --card:#FFFDF7; --ink-panel:#171410;
    --ink:#1B1710; --ink2:#413a2c; --dim:#6c6552; --faint:#948c78;
    --line:rgba(27,23,16,.12); --line2:rgba(27,23,16,.22);
    --yellow:#F4B408; --yellow-2:#FFC933; --gold:#B07C05; --yellow-tint:rgba(244,180,8,.15);
    --red:#D0392B; --green:#1E9A54; --blue:#2f6df6; --violet:#7a5cff;
    --nav-bg:rgba(251,247,236,.72);
    --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
    --sans:"Inter",ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
    --serif:"Instrument Serif",Georgia,"Times New Roman",serif;
  }
  :root[data-theme="dark"]{
    --paper:#131009; --paper2:#1A1610; --card:#1D1811; --ink-panel:#0E0C07;
    --ink:#F2ECDD; --ink2:#CEC6B1; --dim:#9d9580; --faint:#726a57;
    --line:rgba(245,238,222,.12); --line2:rgba(245,238,222,.24);
    --gold:#E7B646; --yellow-tint:rgba(244,180,8,.18);
    --nav-bg:rgba(19,16,9,.74);
  }
  :root[data-theme="dark"] body{
    background-image:radial-gradient(1100px 640px at 50% -12%,rgba(244,180,8,.16),transparent 60%),
                     radial-gradient(760px 520px at 88% 2%,rgba(255,201,51,.08),transparent 60%);
  }
  :root[data-theme="dark"] .hero h1 .hl{color:#1B1710}
  :root[data-theme="dark"] .term,:root[data-theme="dark"] .out{border-color:rgba(245,238,222,.14)}
  *{box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);
       font-size:16.5px;line-height:1.62;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
       background-image:radial-gradient(1100px 640px at 50% -10%,rgba(244,180,8,.24),transparent 62%),
                        radial-gradient(760px 520px at 88% 2%,rgba(255,201,51,.14),transparent 60%);}
  a{color:var(--ink);text-decoration:none;border-bottom:1px solid var(--line2)}
  a:hover{border-color:var(--ink)}
  .wrap{max-width:1060px;margin:0 auto;padding:0 24px}
  .mono{font-family:var(--mono)}
  h1,h2,h3{margin:0;letter-spacing:-.01em}
  .serif{font-family:var(--serif);font-weight:400;letter-spacing:0}
  section{padding:92px 0;border-top:1px solid var(--line);scroll-margin-top:72px}
  .eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold);margin:0 0 18px;font-weight:500}
  .lead{color:var(--ink2);font-size:19px;max-width:66ch}
  h2.serif{font-size:clamp(30px,4.6vw,50px);line-height:1.06;letter-spacing:-.015em}

  /* nav */
  nav{position:sticky;top:0;z-index:30;backdrop-filter:blur(12px);
      background:var(--nav-bg);border-bottom:1px solid var(--line)}
  .themebtn{display:inline-grid;place-items:center;width:36px;height:36px;border-radius:999px;
       border:1px solid var(--line2);background:transparent;color:var(--ink);cursor:pointer;font-size:15px;
       transition:background .12s,transform .12s;line-height:1}
  .themebtn:hover{background:rgba(127,116,90,.14);transform:translateY(-1px)}
  .nav{display:flex;align-items:center;justify-content:space-between;height:64px}
  .brand{display:flex;align-items:center;gap:8px;font-family:var(--serif);font-size:23px;letter-spacing:-.01em;border:0}
  .brand .dot{font-size:18px}
  .brand .mark{flex:none;color:var(--ink);transform:translateY(-1px)}
  .navlinks{display:flex;gap:26px;font-size:14.5px;align-items:center}
  .navlinks a{color:var(--dim);border:0} .navlinks a:hover{color:var(--ink)}
  .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--ink);color:var(--paper);
       border:1px solid var(--ink);border-radius:999px;padding:11px 22px;font-weight:550;font-size:14.5px;cursor:pointer;
       font-family:var(--sans);transition:transform .12s,filter .12s,background .12s;text-decoration:none}
  .btn:hover{transform:translateY(-1px);filter:brightness(1.12)}
  .btn:disabled{opacity:.45;cursor:not-allowed;transform:none}
  .btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line2)}
  .btn.ghost:hover{background:rgba(27,23,16,.05);filter:none}
  .btn.amber{background:var(--yellow);color:#241900;border-color:var(--yellow)}
  .btn.amber:hover{filter:brightness(1.05)}

  /* hero */
  .hero{padding:96px 0 70px;border-top:0;text-align:center}
  .flourish{display:inline-flex;align-items:center;gap:14px;color:var(--gold);
            font-family:var(--mono);font-size:11.5px;letter-spacing:.24em;text-transform:uppercase;margin-bottom:26px}
  .flourish::before,.flourish::after{content:"";width:46px;height:1px;background:linear-gradient(90deg,transparent,var(--line2))}
  .flourish::after{background:linear-gradient(90deg,var(--line2),transparent)}
  .hero h1{font-family:var(--serif);font-weight:400;font-size:clamp(46px,8.2vw,92px);line-height:.98;letter-spacing:-.02em;max-width:15ch;margin:0 auto}
  .hero h1 .hl{position:relative;white-space:nowrap}
  .hero h1 .hl::after{content:"";position:absolute;left:-.06em;right:-.06em;top:.06em;bottom:.14em;background:var(--yellow);z-index:-1;border-radius:5px;opacity:.95}
  .herosub{margin:30px auto 0;font-size:19.5px;color:var(--ink2);max-width:60ch}
  .cta{display:flex;gap:13px;flex-wrap:wrap;justify-content:center;margin-top:36px}
  .beacon{margin-top:34px;display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);
          font-size:12.5px;color:var(--dim);border:1px solid var(--line);border-radius:999px;padding:8px 16px;background:var(--card)}
  .pulse{width:8px;height:8px;border-radius:50%;background:var(--green);box-shadow:0 0 0 0 rgba(30,154,84,.6);animation:pulse 3s infinite}
  @keyframes pulse{0%{box-shadow:0 0 0 0 rgba(30,154,84,.5)}70%{box-shadow:0 0 0 9px rgba(30,154,84,0)}100%{box-shadow:0 0 0 0 rgba(30,154,84,0)}}

  /* terminal card (inverted / dark) */
  .term{margin:44px auto 0;max-width:760px;text-align:left;background:var(--ink-panel);border:1px solid #2b271e;border-radius:14px;
        overflow:hidden;box-shadow:0 40px 80px -44px rgba(60,44,0,.5)}
  .term .bar{display:flex;gap:7px;padding:13px 15px;border-bottom:1px solid #26221a;align-items:center}
  .term .bar i{width:11px;height:11px;border-radius:50%;display:inline-block}
  .term .bar .fn{margin-left:8px;font-family:var(--mono);font-size:12px;color:#8c8574}
  .term .bar .copy{margin-left:auto;font-family:var(--mono);font-size:11px;letter-spacing:.04em;color:#8c8574;background:transparent;border:1px solid #34302650;border-radius:6px;padding:3px 9px;cursor:pointer;transition:color .15s,border-color .15s}
  .term .bar .copy:hover{color:#e9e4d6;border-color:#5a5344}
  .term .bar .copy.ok{color:#27c93f;border-color:#27c93f70}
  .term pre{margin:0;padding:20px;font-family:var(--mono);font-size:13.5px;line-height:1.8;overflow-x:auto;color:#e9e4d6}
  .c-dim{color:#9c9482} .c-red{color:#ff7a6b} .c-green{color:#5cd99a} .c-amber{color:var(--yellow-2)} .c-blue{color:#7fb0ff} .c-violet{color:#b49bff}

  /* generic */
  .grid{display:grid;gap:18px}
  .g2{grid-template-columns:repeat(2,1fr)} .g3{grid-template-columns:repeat(3,1fr)}
  @media(max-width:780px){.g2,.g3{grid-template-columns:1fr}.hero h1{max-width:none}}
  @media(max-width:620px){
    section{padding:64px 0}
    .hero{padding:64px 0 48px}
    .navlinks a:not(.btn):not(.keep){display:none}
    .navlinks{gap:16px}
    .navlinks a.keep{color:var(--ink);font-weight:600}
    .hero h1 .hl{white-space:normal}
    .demo .head{flex-direction:column;align-items:flex-start}
    .lead,.herosub{font-size:17px}
  }
  .card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:24px 24px;transition:border-color .15s,transform .15s,box-shadow .15s}
  .card:hover{border-color:var(--line2);transform:translateY(-2px);box-shadow:0 20px 40px -30px rgba(60,44,0,.35)}
  .card h3{font-size:18px;margin-bottom:9px;letter-spacing:-.01em}
  .card p{margin:0;color:var(--dim);font-size:15px}
  .kicker{font-family:var(--mono);font-size:11.5px;color:var(--faint);text-transform:uppercase;letter-spacing:.14em}
  b,strong{color:var(--ink);font-weight:600}

  .pillars .card{display:flex;gap:16px;align-items:flex-start}
  .pillars .ic{font-size:24px;line-height:1;margin-top:2px}
  .badge{font-family:var(--mono);font-size:10.5px;font-weight:500;padding:4px 10px;border-radius:999px;text-transform:uppercase;letter-spacing:.08em;display:inline-block}
  .b-amber{background:var(--yellow-tint);color:var(--gold)} .b-blue{background:rgba(47,109,246,.12);color:var(--blue)}
  .b-green{background:rgba(30,154,84,.13);color:var(--green)} .b-violet{background:rgba(122,92,255,.12);color:var(--violet)}
  .trk{font-family:var(--mono);font-size:10px;font-weight:500;letter-spacing:.06em;text-transform:uppercase;padding:3px 9px;border-radius:999px;border:1px solid var(--line2);color:var(--gold);background:var(--yellow-tint);white-space:nowrap;display:inline-block}
  .dev-shot{margin-top:13px;width:100%;max-width:230px;image-rendering:pixelated;border:1px solid #2b271e;border-radius:8px;background:#000;display:block}
  .dev-cap{display:block;margin-top:7px;font-family:var(--mono);font-size:10px;letter-spacing:.06em;text-transform:uppercase;color:var(--faint)}

  /* number chip for plain-english / steps */
  .num{font-family:var(--serif);font-size:34px;color:var(--gold);line-height:1;display:block;margin-bottom:10px}

  /* incidents */
  .inc{border-left:3px solid var(--red);background:var(--card)}
  .inc .amt{font-family:var(--mono);color:var(--red);font-weight:500;font-size:15px}
  .inc .lesson{margin-top:10px;color:var(--ink2);font-size:14px}
  .inc .src{margin-top:9px;font-size:12.5px}
  .inc .src a{color:var(--dim);border-bottom-color:var(--line)}

  /* demo */
  .demo .card{padding:0;overflow:hidden}
  .demo .head{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:18px 22px;border-bottom:1px solid var(--line);flex-wrap:wrap;background:var(--paper2)}
  .demo .body{padding:20px 22px}
  .row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
  input{background:var(--paper);border:1px solid var(--line2);color:var(--ink);border-radius:10px;padding:9px 11px;width:66px;font-family:var(--mono);font-size:14px}
  input:focus{outline:none;border-color:var(--gold)}
  .period{border:1px solid var(--line);border-radius:13px;padding:15px 17px;margin:12px 0;display:flex;justify-content:space-between;align-items:center;gap:14px;background:var(--card)}
  .period.locked{background:linear-gradient(90deg,var(--yellow-tint),transparent 66%)}
  .period.paid{background:linear-gradient(90deg,rgba(30,154,84,.09),transparent 66%)}
  .small{font-size:13px;color:var(--dim)}
  a.small{border:0;text-decoration:underline;text-decoration-color:var(--line2)}
  .out{white-space:pre-wrap;font-family:var(--mono);font-size:12.5px;color:#cfc9b8;background:var(--ink-panel);border:1px solid #2b271e;border-radius:11px;padding:15px;margin-top:14px;max-height:230px;overflow:auto}
  .err{color:var(--red);font-weight:500}
  .out .err{color:#ff7a6b}
  .st{display:flex;flex-direction:column;gap:6px}

  /* workflow stepper */
  .flow{display:flex;align-items:stretch;gap:0;flex-wrap:wrap;margin-top:26px;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--card)}
  .flow .step{flex:1 1 150px;min-width:140px;padding:16px 16px;border-right:1px solid var(--line);position:relative}
  .flow .step:last-child{border-right:0}
  .flow .n{font-family:var(--mono);font-size:11px;color:var(--gold);letter-spacing:.1em}
  .flow .t{font-weight:600;margin-top:5px;font-size:15px;letter-spacing:-.01em}
  .flow .d{color:var(--dim);font-size:12.5px;margin-top:3px;line-height:1.45}
  .flow .step.hot{background:var(--yellow-tint)}
  .flow .step.hot .t{color:var(--gold)}
  @media(max-width:720px){.flow .step{flex-basis:46%;border-bottom:1px solid var(--line)}}

  /* AI schedule input */
  .ai{display:flex;gap:10px;align-items:center;flex-wrap:wrap;background:var(--paper2);border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin-bottom:16px}
  .ai .txt{flex:1 1 320px;min-width:220px;width:auto;font-family:var(--sans);font-size:14.5px}
  .ai .sparkle{font-size:15px}
  .ai .parsed{width:100%;font-size:13px;color:var(--gold);font-family:var(--mono);margin-top:2px}

  /* scheduled transfer (HIP-423) panel */
  .sched{border:1px dashed var(--line2);border-radius:12px;padding:14px 16px;margin-top:12px;background:var(--card)}
  .sched .lbl{display:block;margin-bottom:2px}
  .sched .ctl{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-top:11px}
  .sched .ctl .small{color:var(--dim)}
  .sched input[type=number]{width:76px}
  .sched .tag{font-family:var(--mono);font-size:10.5px;font-weight:500;padding:3px 9px;border-radius:999px;background:rgba(30,154,84,.13);color:var(--green);text-transform:uppercase;letter-spacing:.07em}

  /* example scenario picker */
  .scene-select{display:flex;align-items:center;gap:9px}
  select{background:var(--paper);border:1px solid var(--line2);color:var(--ink);border-radius:10px;padding:9px 12px;font-family:var(--sans);font-size:14.5px;max-width:100%;cursor:pointer}
  select:focus{outline:none;border-color:var(--gold)}
  .story{font-size:15px;color:var(--ink2);background:var(--paper2);border:1px solid var(--line);border-radius:12px;padding:15px 17px;line-height:1.6}
  .story b{color:var(--ink)}
  .story .actor{font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--gold);display:block;margin-bottom:7px}
  @media(max-width:620px){.scene-card .head{flex-direction:column;align-items:flex-start}}

  /* settlements */
  .settle{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:11px 2px;border-bottom:1px dashed var(--line)}
  .settle:last-child{border-bottom:0}
  .settle .amt2{font-family:var(--mono);color:var(--green);font-size:13px}
  .settle .when{font-size:12.5px;color:var(--faint)}

  /* section soft-alt background */
  .alt{background:var(--paper2)}

  /* Integrate: equal-height side-by-side cards so the shorter one has no void */
  .sdk-grid>div{display:flex;flex-direction:column;min-width:0}
  .sdk-grid .term{margin:14px 0 0;flex:1 1 auto;display:flex;flex-direction:column;min-width:0}
  .sdk-grid .term pre{flex:1 1 auto}
  @media(max-width:780px){.sdk-grid .term{flex:0 0 auto}}

  footer{padding:56px 0 80px;border-top:1px solid var(--line);color:var(--dim);font-size:14.5px}
  footer a{color:var(--dim)}
  .tracks{display:flex;gap:10px;flex-wrap:wrap;margin:16px 0}
  .chip{font-family:var(--mono);font-size:12px;border:1px solid var(--line2);border-radius:999px;padding:6px 14px;color:var(--ink);background:var(--card)}
  .closing{font-family:var(--serif);font-size:clamp(26px,4vw,40px);line-height:1.1;color:var(--ink);max-width:20ch;letter-spacing:-.01em}

  /* live proof-run timeline */
  .wf-controls{display:flex;gap:14px;align-items:center;flex-wrap:wrap;margin:26px 0 8px}
  .wf-live{font-family:var(--mono);font-size:12.5px;color:var(--dim);display:inline-flex;align-items:center;gap:8px;line-height:1.5}
  .rf{margin-top:22px;display:flex;flex-direction:column}
  .rf-row{display:grid;grid-template-columns:38px 1fr;gap:16px;align-items:stretch}
  .rf-rail{display:flex;flex-direction:column;align-items:center}
  .rf-dot{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font-family:var(--mono);font-size:13.5px;font-weight:600;
          border:2px solid var(--line2);color:var(--dim);background:var(--card);flex:0 0 auto;z-index:2;transition:all .35s}
  .rf-line{width:2px;flex:1 1 auto;background:var(--line);min-height:20px;margin:3px 0}
  .rf-row:last-child .rf-line{display:none}
  .rf-body{padding-bottom:24px;min-width:0}
  .rf-who{font-family:var(--mono);font-size:10.5px;letter-spacing:.11em;text-transform:uppercase;color:var(--faint)}
  .rf-title{font-weight:600;font-size:16.5px;letter-spacing:-.01em;margin-top:3px;display:flex;align-items:center;gap:9px}
  .rf-title .ic{font-size:19px;line-height:1}
  .rf-desc{color:var(--dim);font-size:14px;margin-top:5px;line-height:1.5}
  .rf-result{margin-top:11px;font-family:var(--mono);font-size:12.5px;background:var(--ink-panel);border:1px solid #2b271e;border-radius:11px;
             padding:12px 14px;color:#cfc9b8;display:none;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.7}
  .rf-row.show .rf-result{display:block}
  .rf-result a{color:#7fb0ff;border-bottom:1px solid #7fb0ff45;font-weight:500}
  .rf-result a:hover{border-color:#7fb0ff}
  .rf-result b{color:#f2ecdd} .rf-result .ok{color:#5cd99a} .rf-result .no{color:#ffb347} .rf-result .rd{color:#ff7a6b}
  .rf-row.idle{opacity:.5}
  .rf-row.run .rf-dot{border-color:var(--gold);color:var(--gold);box-shadow:0 0 0 5px var(--yellow-tint);animation:rfpulse 1.3s infinite}
  .rf-row.run .rf-title{color:var(--gold)}
  .rf-row.done .rf-dot{border-color:var(--green);background:var(--green);color:#04371f}
  .rf-row.done .rf-line{background:linear-gradient(180deg,var(--green),var(--line))}
  .rf-row.hot .rf-dot{border-color:var(--red);color:var(--red);background:var(--card);box-shadow:0 0 0 5px rgba(208,57,43,.16)}
  .rf-row.hot .rf-title{color:var(--red)}
  @keyframes rfpulse{0%,100%{box-shadow:0 0 0 4px var(--yellow-tint)}50%{box-shadow:0 0 0 8px transparent}}
  @media(max-width:620px){.rf-title{font-size:15.5px}.rf-row{gap:13px;grid-template-columns:34px 1fr}}