/* VSL PRE-T0 v0.2.2 visual-only hardening: public UI typography floor normalized to 12px (.75rem); scientific/protocol/content bytes unchanged. */
:root{
  --bg:#f6f9fc;
  --surface:#ffffff;
  --surface-2:#f9fbfd;
  --ink:#122033;
  --muted:#66788f;
  --line:#dce5ef;
  --line-strong:#c8d6e6;
  --blue:#0b61d8;
  --blue-2:#2f7ee6;
  --blue-soft:#edf5ff;
  --navy:#0b1f3a;
  --green:#177a52;
  --green-soft:#eef9f4;
  --amber:#8b5a00;
  --amber-soft:#fff8e8;
  --danger:#8a2c2c;
  --shadow:0 22px 60px rgba(29,49,77,.08);
  --radius:24px;
  --radius-sm:16px;
  --max:1200px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  color:var(--ink);
  background:
    radial-gradient(circle at 8% 0%,rgba(62,132,223,.10),transparent 34rem),
    radial-gradient(circle at 98% 18%,rgba(130,162,205,.08),transparent 30rem),
    var(--bg);
  line-height:1.6;
}
a{color:var(--blue)}
button,a.button{font:inherit}
.wrap{width:min(var(--max),calc(100% - 40px));margin:0 auto}
.narrow{max-width:900px}
.skip{position:absolute;left:-9999px;top:0;background:var(--navy);color:#fff;padding:10px 14px;z-index:1000}
.skip:focus{left:10px;top:10px}
.sitebar{position:sticky;top:0;z-index:30;background:rgba(247,249,252,.88);backdrop-filter:blur(18px);border-bottom:1px solid rgba(220,229,239,.85)}
.sitebar-inner{min-height:70px;display:grid;grid-template-columns:auto auto 1fr;align-items:center;gap:24px}
.brand{text-decoration:none;color:var(--navy);font-weight:850;letter-spacing:-.025em;white-space:nowrap}
.brand-main{margin-right:2px}.brand-sub{font-weight:650;color:#314862}
.study-mark{font-size:.78rem;font-weight:850;letter-spacing:.08em;color:var(--navy);white-space:nowrap}.study-mark span{color:var(--amber)}
.nav{display:flex;justify-content:flex-end;gap:18px;flex-wrap:wrap}.nav a{text-decoration:none;color:var(--muted);font-size:.9rem;font-weight:650}
.section-first{padding-top:90px}.section{padding:74px 0}.hero{padding-bottom:76px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(360px,.85fr);gap:54px;align-items:center}
.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:.76rem;color:var(--blue);font-weight:850}
h1,h2,h3{color:var(--navy)}
h1{font-size:clamp(3rem,7vw,6.25rem);line-height:.94;letter-spacing:-.06em;margin:22px 0 26px;max-width:980px}h1 span{color:#385d88}
h2{font-size:clamp(2.15rem,4.8vw,4rem);line-height:1.03;letter-spacing:-.045em;margin:10px 0 18px}
h3{margin:0 0 10px;letter-spacing:-.025em}
.lead{font-size:clamp(1.12rem,2vw,1.38rem);color:#465a72;max-width:850px;margin:0}
.hero-principle{margin:30px 0 0;padding:17px 20px;border-left:3px solid var(--blue);background:linear-gradient(90deg,rgba(237,245,255,.9),rgba(237,245,255,0));font-weight:750;color:#243c58;max-width:860px}
.status-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:26px}.pill{display:inline-flex;align-items:center;padding:7px 11px;border-radius:999px;border:1px solid var(--line);background:rgba(255,255,255,.82);font-size:.76rem;font-weight:850;letter-spacing:.05em}.pill.pre{color:var(--amber);background:var(--amber-soft);border-color:#ecd8a7}.pill.good{color:var(--green);background:var(--green-soft);border-color:#cce7d9}
.actions,.prompt-tools{display:flex;gap:11px;flex-wrap:wrap;margin-top:28px}.button,button{display:inline-flex;align-items:center;justify-content:center;text-decoration:none;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--ink);padding:11px 17px;font-weight:780;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease}.button.primary{background:var(--navy);color:#fff;border-color:var(--navy)}.button.secondary{background:var(--blue-soft);color:#0a4fae;border-color:#cfe2fb}.button.ghost{background:rgba(255,255,255,.7)}.button:hover:not(.disabled),button:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 9px 24px rgba(31,50,76,.10)}.button.disabled,button:disabled,[aria-disabled="true"]{cursor:not-allowed;opacity:.5}
.micro{font-size:.84rem;color:var(--muted);margin-top:18px;max-width:850px}
.hero-instrument{background:rgba(255,255,255,.88);border:1px solid var(--line);border-radius:30px;padding:24px;box-shadow:var(--shadow);overflow:hidden;position:relative}.hero-instrument:before{content:"";position:absolute;inset:auto -60px -80px auto;width:210px;height:210px;border-radius:50%;background:radial-gradient(circle,rgba(11,97,216,.12),transparent 68%)}
.instrument-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;padding-bottom:18px;border-bottom:1px solid var(--line)}.instrument-head span{font-size:.75rem;letter-spacing:.12em;font-weight:850;color:var(--muted)}.instrument-head strong{font-size:.86rem;color:var(--navy)}
.constant-object{display:grid;grid-template-columns:90px 1fr;gap:18px;align-items:center;padding:28px 0}.object-label{writing-mode:vertical-rl;transform:rotate(180deg);font-size:.75rem;letter-spacing:.16em;font-weight:850;color:var(--blue)}.object-core{border:1px solid #cfe2fb;background:linear-gradient(145deg,#f7fbff,#edf5ff);border-radius:24px;padding:24px;display:flex;flex-direction:column;gap:4px}.object-core span{font-size:.78rem;letter-spacing:.12em;color:var(--blue);font-weight:850}.object-core strong{font-size:2rem;letter-spacing:-.04em}.object-core small{color:var(--muted)}
.reader-flow{display:flex;align-items:center;gap:10px}.reader{flex:0 0 82px;aspect-ratio:1;border-radius:50%;border:1px solid var(--line-strong);display:grid;place-items:center;text-align:center;background:#fff;font-size:.75rem;color:var(--muted);line-height:1.2}.reader b{color:var(--navy);font-size:.88rem}.flow-line{height:1px;background:linear-gradient(90deg,var(--line-strong),var(--blue),var(--line-strong));flex:1}.instrument-foot{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:24px;padding-top:16px;border-top:1px solid var(--line)}.instrument-foot span{font-size:.75rem;color:var(--muted);text-align:center}
.statement{background:linear-gradient(180deg,rgba(255,255,255,.72),rgba(255,255,255,.35));border-top:1px solid rgba(220,229,239,.8);border-bottom:1px solid rgba(220,229,239,.8)}.large-copy{font-size:clamp(1.25rem,2.2vw,1.7rem);color:#314862;max-width:880px}.boundary-copy{color:var(--muted);max-width:820px}
.section-heading{margin-bottom:34px}.split-heading{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(300px,.75fr);gap:44px;align-items:end}.split-heading p{margin:0;color:var(--muted)}
.dual-path{display:grid;grid-template-columns:1fr 150px 1fr;align-items:center;gap:18px}.path-card{border-radius:var(--radius);padding:30px;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);min-height:235px}.human-path{background:linear-gradient(145deg,#fff,#fbfcfe)}.machine-path{background:linear-gradient(145deg,#f8fbff,#edf5ff);border-color:#d0e3fb}.path-label{font-size:.75rem;letter-spacing:.14em;font-weight:850;color:var(--muted);margin-bottom:14px}.path-card h3{font-size:2rem}.path-card p{color:var(--muted)}.path-action{margin-top:28px;padding-top:14px;border-top:1px solid var(--line);font-size:.76rem;font-weight:850;letter-spacing:.08em;color:var(--navy)}.path-center{text-align:center;color:var(--muted);font-size:.78rem;text-transform:uppercase;letter-spacing:.1em;position:relative}.path-center:before,.path-center:after{content:"";display:block;height:1px;background:var(--line);margin:12px 0}
.fixed-change-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:24px}.fixed-panel,.change-panel{border-radius:var(--radius);padding:28px;border:1px solid var(--line);background:rgba(255,255,255,.84)}.fixed-panel{box-shadow:inset 4px 0 0 var(--blue)}.change-panel{box-shadow:inset 4px 0 0 #7a90aa}.fixed-panel ul,.change-panel ul{margin:14px 0 0;padding-left:1.15rem;color:var(--muted)}.fixed-panel li,.change-panel li{margin:.5rem 0}
.sequence-section{background:#0d1c31;color:#d8e5f4}.sequence-section h2{color:#fff;max-width:900px}.sequence-section .eyebrow{color:#7db4ff}.sequence{display:grid;grid-template-columns:repeat(6,1fr);gap:1px;margin-top:34px;background:#2a3a50;border:1px solid #2a3a50;border-radius:22px;overflow:hidden}.sequence-item{background:#12243b;padding:22px;min-height:235px;display:flex;flex-direction:column}.sequence-item span{font-size:.75rem;color:#7db4ff;font-weight:850;letter-spacing:.1em}.sequence-item strong{color:#fff;font-size:1.05rem;margin:34px 0 8px}.sequence-item small{color:#aebfd2;line-height:1.5}
.protocol-shell{background:#fff;border:1px solid var(--line);border-radius:28px;overflow:hidden;box-shadow:var(--shadow);margin-top:28px}.protocol-topline{display:flex;justify-content:space-between;gap:18px;align-items:center;padding:20px 24px;border-bottom:1px solid var(--line);background:var(--surface-2)}.protocol-topline>div{display:flex;gap:12px;align-items:center}.protocol-id{display:inline-flex;padding:5px 9px;border-radius:999px;background:var(--blue-soft);color:var(--blue);font-size:.75rem;font-weight:850}.protocol-state{font-size:.75rem;letter-spacing:.08em;font-weight:850;color:var(--muted)}.protocol-shell pre{white-space:pre-wrap;overflow-wrap:anywhere;margin:0;padding:26px;background:#0c1727;color:#edf4fc;font:500 .91rem/1.65 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}.protocol-shell .prompt-tools{padding:0 24px 8px}.protocol-hash{padding:0 24px 20px;color:var(--muted);font:500 .78rem/1.5 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;overflow-wrap:anywhere}.exit-shell{margin-top:18px}.protocol-intro{padding:22px 24px 0;color:var(--muted);margin:0}.exit-shell details{margin:18px 24px 0;border:1px solid var(--line);border-radius:16px;overflow:hidden}.exit-shell summary{cursor:pointer;padding:14px 16px;font-weight:750;background:var(--surface-2)}.exit-shell details pre{border-radius:0}
.integrity{background:linear-gradient(180deg,rgba(239,246,255,.6),rgba(246,249,252,.2))}.timeline{display:flex;align-items:center;margin:34px 0 44px}.time-node{flex:0 0 150px;border:1px solid var(--line-strong);background:#fff;border-radius:18px;padding:14px;text-align:center;box-shadow:0 8px 20px rgba(31,49,74,.05)}.time-node.current{border-color:#e7cc8d;background:var(--amber-soft)}.time-node b{display:block;color:var(--navy);font-size:.85rem}.time-node span{display:block;color:var(--muted);font-size:.75rem;margin-top:4px}.time-line{height:1px;background:var(--line-strong);flex:1}.integrity-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.integrity-grid article{background:rgba(255,255,255,.85);border:1px solid var(--line);border-radius:20px;padding:22px}.integrity-grid span{font-size:.75rem;color:var(--blue);font-weight:850}.integrity-grid h3{margin-top:18px}.integrity-grid p{color:var(--muted);margin-bottom:0}
.data-boundary h2{max-width:920px}.boundary-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.yes-card,.no-card{border-radius:24px;padding:28px;border:1px solid var(--line);background:#fff}.yes-card{box-shadow:inset 4px 0 0 var(--green)}.no-card{box-shadow:inset 4px 0 0 #7a90aa}.yes-card ul,.no-card ul{padding-left:1.15rem;color:var(--muted)}.yes-card li,.no-card li{margin:.52rem 0}
.human-editions{background:#fff;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.human-edition-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:54px;align-items:center}.human-edition-grid p{color:var(--muted);max-width:720px}.human-note{min-height:260px;border-radius:28px;padding:32px;background:linear-gradient(145deg,#f7fbff,#edf5ff);display:flex;flex-direction:column;justify-content:center}.human-note p{font-size:1.6rem;line-height:1.3;color:#314862;margin:0}.quote-mark{font-family:Georgia,serif;font-size:4rem;color:#9dc5f6;line-height:.8}
.artifact-card{background:#fff;border:1px solid var(--line);border-radius:24px;overflow:hidden;box-shadow:var(--shadow)}.artifact-row{display:grid;grid-template-columns:170px 1fr;gap:22px;padding:17px 22px}.artifact-row+.artifact-row{border-top:1px solid var(--line)}.artifact-row>span{text-transform:uppercase;letter-spacing:.08em;font-size:.75rem;font-weight:850;color:var(--muted)}.artifact-row code{font:500 .78rem/1.5 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;overflow-wrap:anywhere;color:#4a6078}
.closing{padding-top:24px}.closing-inner{border-radius:30px;padding:36px;background:linear-gradient(135deg,#0e2038,#173554);color:#d8e5f4;display:grid;grid-template-columns:1fr auto;gap:30px;align-items:center}.closing h2{color:#fff;margin-bottom:0}.closing .eyebrow{color:#7db4ff}.closing-actions{display:flex;flex-direction:column;gap:10px}.closing .button.ghost{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.16);color:#fff}.closing .button.primary{background:#fff;color:var(--navy);border-color:#fff}
.footer{border-top:1px solid var(--line);padding:34px 0 52px;color:var(--muted);font-size:.9rem}.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:28px}.footer p{margin:.35rem 0 0}.footer a{text-decoration:none}
.toast{position:fixed;right:18px;bottom:18px;background:var(--navy);color:#fff;padding:11px 15px;border-radius:12px;opacity:0;transform:translateY(8px);pointer-events:none;transition:.2s;z-index:60}.toast.show{opacity:1;transform:translateY(0)}
.encounter-body{min-height:100vh;background:radial-gradient(circle at 50% 0,rgba(30,100,190,.12),transparent 34rem),#f6f9fc}.encounter-shell{width:min(920px,calc(100% - 36px));margin:0 auto;padding:68px 0 74px}.encounter-brand{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-bottom:56px}.encounter-brand a{text-decoration:none;color:var(--navy);font-weight:850}.machine-tag{font-size:.75rem;letter-spacing:.1em;color:var(--muted);font-weight:850}.machine-title{font-size:clamp(3.2rem,12vw,7.8rem);letter-spacing:-.065em;line-height:.88;margin:0}.machine-directive{font:800 clamp(1rem,2.8vw,1.5rem)/1.5 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:#1a4f91;margin:28px 0}.machine-frame{border:1px solid var(--line);border-radius:24px;background:#fff;overflow:hidden;box-shadow:var(--shadow)}.machine-frame pre{margin:0;padding:26px;background:#0c1727;color:#eaf2fb;font:500 .9rem/1.75 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;white-space:pre-wrap;overflow-wrap:anywhere}.machine-links{display:flex;gap:10px;flex-wrap:wrap;padding:22px}.machine-note{margin-top:20px;color:var(--muted);font-size:.88rem}.machine-note strong{color:var(--amber)}
@media(max-width:1040px){.hero-grid{grid-template-columns:1fr}.hero-instrument{max-width:720px}.sequence{grid-template-columns:repeat(3,1fr)}.timeline{overflow-x:auto;padding-bottom:8px}.time-line{min-width:50px}.split-heading{grid-template-columns:1fr}.closing-inner{grid-template-columns:1fr}.closing-actions{flex-direction:row;flex-wrap:wrap}}
@media(max-width:760px){.wrap{width:min(var(--max),calc(100% - 28px))}.sitebar-inner{grid-template-columns:1fr auto}.nav{display:none}.study-mark{font-size:.75rem}.section-first{padding-top:58px}.section{padding:56px 0}.hero-grid{gap:30px}.hero-instrument{padding:18px}.reader-flow{gap:6px}.reader{flex-basis:68px}.instrument-foot{grid-template-columns:1fr}.dual-path{grid-template-columns:1fr}.path-center{padding:4px 0}.fixed-change-grid,.boundary-grid,.human-edition-grid{grid-template-columns:1fr}.sequence{grid-template-columns:1fr 1fr}.integrity-grid{grid-template-columns:1fr}.artifact-row{grid-template-columns:1fr;gap:4px}.footer-grid{grid-template-columns:1fr}.protocol-topline{align-items:flex-start;flex-direction:column}.closing-inner{padding:28px}}
@media(max-width:500px){h1{font-size:clamp(2.75rem,16vw,4.4rem)}.sequence{grid-template-columns:1fr}.sequence-item{min-height:auto}.timeline{display:grid;grid-template-columns:1fr;gap:8px}.time-node{width:100%;flex:auto}.time-line{width:1px;height:18px;min-width:0;justify-self:center}.reader-flow{display:grid;grid-template-columns:1fr}.flow-line{width:1px;height:18px;justify-self:center}.reader{width:76px;justify-self:center}.constant-object{grid-template-columns:1fr}.object-label{writing-mode:horizontal-tb;transform:none}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}