:root{
  --sn-ink:#eaf3ff;
  --sn-muted:#9bb6d7;
  --sn-soft:#c9ddf8;
  --sn-bg:#071426;
  --sn-bg2:#0b1d34;
  --sn-panel:rgba(11,31,57,.88);
  --sn-panel2:rgba(17,43,78,.78);
  --sn-line:rgba(134,181,229,.32);
  --sn-line2:rgba(134,181,229,.15);
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  --sn-accent2:#4dd1ff;
  --sn-gold:#e8c46b;
  --sn-rose:#ff7d9c;
  --sn-green:#79e1b7;
  --sn-warning:#ffd166;
  --sn-shadow:0 18px 60px rgba(0,0,0,.36);
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  --sn-radius-sm:14px;
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}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  color:var(--sn-ink);
  font-family:var(--sn-sans);
  background:
    radial-gradient(circle at 20% 0%,rgba(66,153,225,.35),transparent 28rem),
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    linear-gradient(180deg,#061120 0%,#08172a 44%,#050b16 100%);
  min-height:100vh;
}
a{color:var(--sn-accent);text-decoration:none}
a:hover{text-decoration:underline}
.site-shell{width:min(1480px,calc(100% - 28px));margin:0 auto;padding:18px 0 52px}
.topbar{
  position:sticky;top:0;z-index:40;
  background:linear-gradient(180deg,rgba(5,15,29,.97),rgba(5,15,29,.78));
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  backdrop-filter:blur(14px);
}
.topbar-inner{width:min(1480px,calc(100% - 28px));margin:0 auto;display:flex;align-items:center;gap:16px;padding:12px 0}
.brand{display:flex;align-items:center;gap:12px;font-weight:800;letter-spacing:.04em;text-transform:uppercase;font-size:.82rem;color:var(--sn-soft)}
.brand-mark{width:34px;height:34px;border-radius:12px;border:1px solid var(--sn-line);display:grid;place-items:center;background:linear-gradient(145deg,rgba(43,114,196,.7),rgba(7,20,38,.7));box-shadow:0 0 28px rgba(77,209,255,.22)}
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.nav-links a:hover{background:rgba(119,183,255,.08);border-color:var(--sn-line);text-decoration:none;color:var(--sn-ink)}
.hero{display:grid;grid-template-columns:1.35fr .65fr;gap:18px;margin:22px 0 18px;align-items:stretch}
.hero-card,.metric-card,.panel,.method-card,.annotation-card{
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.hero-card{padding:34px;position:relative;overflow:hidden}
.hero-card:before{content:"";position:absolute;inset:-2px;background:radial-gradient(circle at 78% 20%,rgba(77,209,255,.18),transparent 22rem);pointer-events:none}
.eyebrow{position:relative;color:var(--sn-accent2);letter-spacing:.16em;text-transform:uppercase;font-size:.76rem;font-weight:800;margin:0 0 14px}
h1{position:relative;font-size:clamp(2rem,5vw,4.65rem);line-height:.95;margin:0 0 18px;letter-spacing:-.06em}
.hero p{position:relative;color:var(--sn-soft);font-size:1.06rem;line-height:1.7;max-width:85ch;margin:0}
.hero-aside{padding:22px;display:grid;gap:12px}
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.model-tag span{display:block;color:var(--sn-muted);font-size:.75rem;text-transform:uppercase;letter-spacing:.12em;margin-bottom:4px}
.model-tag strong{font-size:1.05rem;color:var(--sn-ink)}
.grid{display:grid;gap:18px}
.grid-main{grid-template-columns:360px minmax(0,1fr)}
.panel{padding:20px;min-width:0}
.panel h2,.panel h3{margin:0 0 12px;letter-spacing:-.03em}
.panel h2{font-size:1.3rem}.panel h3{font-size:1.06rem}
.panel p,.small-note{color:var(--sn-muted);line-height:1.58;font-size:.93rem}
.control-stack{display:grid;gap:14px}
.field{display:grid;gap:7px}
label{font-weight:750;font-size:.86rem;color:var(--sn-soft)}
input,select,textarea,button{
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input,select,textarea{
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textarea{min-height:145px;resize:vertical;line-height:1.45}
input:focus,select:focus,textarea:focus{border-color:rgba(77,209,255,.78);box-shadow:0 0 0 3px rgba(77,209,255,.12)}
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.primary-btn{background:linear-gradient(135deg,#2b72c4,#1d91d6);color:white;border-color:rgba(155,203,255,.58);box-shadow:0 14px 36px rgba(29,145,214,.23)}
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.button-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.range-row{display:grid;grid-template-columns:1fr auto;gap:10px;align-items:center}
.range-value{font-family:var(--sn-mono);color:var(--sn-accent2);font-size:.88rem;min-width:3rem;text-align:right}
input[type="range"]{accent-color:#4dd1ff;padding:0;background:transparent;border:none;box-shadow:none}
.hidden{display:none!important}
.status{min-height:22px;color:var(--sn-muted);font-size:.88rem;line-height:1.45}
.status.warn{color:var(--sn-warning)}.status.good{color:var(--sn-green)}.status.bad{color:var(--sn-rose)}
.output-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:18px;align-items:start}
.canvas-wrap{position:relative;border:1px solid var(--sn-line);border-radius:var(--sn-radius);background:linear-gradient(180deg,rgba(3,13,25,.9),rgba(10,31,58,.72));overflow:hidden;min-height:500px}
#boundarySvg{display:block;width:100%;height:500px}
.legend{position:absolute;left:14px;bottom:14px;display:flex;gap:8px;flex-wrap:wrap}
.legend span{font-size:.78rem;padding:6px 9px;border-radius:999px;border:1px solid var(--sn-line2);background:rgba(4,14,27,.8);color:var(--sn-muted)}
.card-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-bottom:18px}
.metric-card{padding:15px;background:linear-gradient(180deg,rgba(12,37,68,.88),rgba(6,18,34,.88))}
.metric-card small{display:block;color:var(--sn-muted);letter-spacing:.08em;text-transform:uppercase;font-size:.68rem;font-weight:900;margin-bottom:6px}
.metric-card strong{display:block;font-size:1.7rem;letter-spacing:-.04em}
.meter{height:8px;background:rgba(119,183,255,.13);border-radius:99px;overflow:hidden;margin-top:10px;border:1px solid var(--sn-line2)}
.meter i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--sn-accent),var(--sn-accent2));border-radius:99px}
.views{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 14px}.chip-btn{font-size:.84rem;padding:9px 11px}
.view-panel{display:none}.view-panel.active{display:block}
.issue-list{display:grid;gap:9px}
.issue-row{display:grid;grid-template-columns:1fr 88px;gap:10px;align-items:center;border:1px solid var(--sn-line2);border-radius:14px;padding:10px;background:rgba(4,14,27,.38)}
.issue-row b{font-size:.9rem}.issue-row em{font-style:normal;color:var(--sn-muted);font-size:.78rem}.issue-score{font-family:var(--sn-mono);text-align:right;color:var(--sn-accent2)}
.table-wrap{overflow:auto;border:1px solid var(--sn-line);border-radius:16px;background:rgba(4,14,27,.42)}
table{width:100%;border-collapse:collapse;min-width:640px}th,td{padding:11px 12px;border-bottom:1px solid var(--sn-line2);text-align:left;vertical-align:top}th{color:var(--sn-soft);font-size:.78rem;text-transform:uppercase;letter-spacing:.1em;background:rgba(119,183,255,.08)}td{color:var(--sn-muted);font-size:.9rem}tr:last-child td{border-bottom:none}
.phase-map{height:360px;border:1px solid var(--sn-line);border-radius:18px;background:linear-gradient(135deg,rgba(77,209,255,.08),rgba(255,125,156,.08));position:relative;overflow:hidden}
.phase-map:before{content:"Issue Energy";position:absolute;right:12px;top:10px;color:var(--sn-muted);font-size:.72rem;text-transform:uppercase;letter-spacing:.1em}.phase-map:after{content:"Wall Resistance";position:absolute;left:12px;bottom:10px;color:var(--sn-muted);font-size:.72rem;text-transform:uppercase;letter-spacing:.1em}
.phase-gridline{position:absolute;background:rgba(155,190,228,.12)}.phase-gridline.v{top:0;bottom:0;width:1px}.phase-gridline.h{left:0;right:0;height:1px}
.phase-dot{position:absolute;width:22px;height:22px;border-radius:99px;background:var(--sn-accent2);box-shadow:0 0 0 10px rgba(77,209,255,.14),0 0 38px rgba(77,209,255,.65);transform:translate(-50%,-50%)}
.phase-label{position:absolute;transform:translate(12px,-28px);background:rgba(4,14,27,.9);border:1px solid var(--sn-line);border-radius:12px;padding:8px 10px;color:var(--sn-soft);font-size:.82rem;white-space:nowrap}
.timeline{display:grid;gap:9px}.timeline-row{display:grid;grid-template-columns:95px 1fr 54px;gap:10px;align-items:center}.timeline-bar{height:14px;background:rgba(119,183,255,.1);border:1px solid var(--sn-line2);border-radius:999px;overflow:hidden}.timeline-bar i{display:block;height:100%;background:linear-gradient(90deg,var(--sn-gold),var(--sn-accent2));width:0}.timeline-row span,.timeline-row output{color:var(--sn-muted);font-size:.84rem;font-family:var(--sn-mono)}
.outcome-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.outcome-card{border:1px solid var(--sn-line2);border-radius:16px;padding:13px;background:rgba(4,14,27,.42)}.outcome-card b{display:block;color:var(--sn-ink);margin-bottom:5px}.outcome-card p{margin:0;color:var(--sn-muted);font-size:.88rem;line-height:1.45}.outcome-card.active{border-color:rgba(77,209,255,.72);background:rgba(37,113,190,.18)}
.method-card,.annotation-card{padding:22px;margin-top:18px}.method-card h2,.annotation-card h2{margin:0 0 10px}.method-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.equation{font-family:var(--sn-mono);background:rgba(4,14,27,.7);border:1px solid var(--sn-line2);border-radius:12px;padding:12px;color:var(--sn-soft);overflow:auto}.note-list{color:var(--sn-muted);line-height:1.55}.note-list li{margin:.45rem 0}
.annotations-log{display:grid;gap:10px;margin-top:14px}.annotation-item{border:1px solid var(--sn-line2);border-radius:14px;background:rgba(4,14,27,.45);padding:12px}.annotation-item small{color:var(--sn-muted);display:block;margin-bottom:5px}.annotation-item p{margin:0;color:var(--sn-soft);line-height:1.45}
.footer{color:var(--sn-muted);text-align:center;margin-top:26px;font-size:.84rem}
.kicker{display:inline-flex;gap:8px;align-items:center;border:1px solid var(--sn-line);border-radius:999px;padding:7px 11px;background:rgba(8,26,48,.75);color:var(--sn-muted);font-size:.8rem;margin-bottom:12px}.pulse{width:8px;height:8px;border-radius:99px;background:var(--sn-accent2);box-shadow:0 0 20px var(--sn-accent2)}
.code-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
pre{white-space:pre-wrap;word-break:break-word;background:rgba(2,10,20,.68);border:1px solid var(--sn-line2);border-radius:14px;padding:12px;color:var(--sn-soft);max-height:280px;overflow:auto}
@media(max-width:1120px){.hero,.grid-main,.output-grid,.method-grid{grid-template-columns:1fr}.card-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:700px){.topbar-inner{display:block}.nav-links{margin:12px 0 0}.hero-card{padding:24px}.input-mode,.card-grid,.outcome-grid{grid-template-columns:1fr}.canvas-wrap{min-height:390px}#boundarySvg{height:390px}.site-shell{width:min(100% - 18px,1480px)}}

/* academic polish */
.highlight-row td{background:rgba(255,125,156,.10)}
.version-badge{font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--sn-accent2);border:1px solid var(--sn-line);border-radius:999px;padding:4px 10px;margin-left:8px;white-space:nowrap}
.academic-banner{background:rgba(77,209,255,.08);border:1px solid var(--sn-line2);border-radius:14px;padding:12px 16px;margin-bottom:18px;font-size:.9rem;color:var(--sn-soft);line-height:1.5}
.academic-banner strong{color:var(--sn-ink)}
.cite-box{background:rgba(4,14,27,.7);border:1px solid var(--sn-line);border-radius:14px;padding:14px;font-family:var(--sn-mono);font-size:.82rem;color:var(--sn-soft);white-space:pre-wrap;overflow:auto}
.theory-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
@media(max-width:900px){.theory-grid{grid-template-columns:1fr}}
.metric-card strong small{font-weight:500;opacity:.75}
.table-wrap table tr.highlight-row{background:rgba(255,125,156,.12)}

/* v3 interactive hypothesis workbench */
.inspectable{cursor:pointer;position:relative}
.inspectable:hover{outline:1px solid rgba(77,209,255,.65);box-shadow:0 0 0 4px rgba(77,209,255,.08)}
.inspect-active{outline:2px solid rgba(77,209,255,.95)!important;box-shadow:0 0 0 6px rgba(77,209,255,.16)!important}
.inline-badge{display:inline-block;border:1px solid var(--sn-line2);border-radius:999px;padding:2px 7px;font-size:.68rem;color:var(--sn-accent2);background:rgba(77,209,255,.08);vertical-align:middle}
.ai-field input[type="checkbox"], .report-preview-grid input[type="checkbox"]{width:auto;margin-right:8px;accent-color:#4dd1ff}
.hypothesis-grid{display:grid;gap:12px}
.hypothesis-card{border:1px solid var(--sn-line2);border-radius:16px;background:rgba(4,14,27,.52);padding:14px}
.hypothesis-card h4{margin:0 0 8px;color:var(--sn-ink)}
.hypothesis-card p{margin:0 0 10px;color:var(--sn-soft);line-height:1.5;font-size:.9rem}
.hypothesis-basis{display:flex;gap:7px;flex-wrap:wrap}.hypothesis-basis span{font-size:.74rem;border:1px solid var(--sn-line);border-radius:999px;padding:5px 8px;color:var(--sn-muted);background:rgba(119,183,255,.08)}
.inspection-drawer{position:fixed;z-index:90;right:0;top:0;height:100dvh;width:min(460px,94vw);background:linear-gradient(180deg,rgba(6,18,34,.98),rgba(10,31,58,.98));border-left:1px solid var(--sn-line);box-shadow:-18px 0 55px rgba(0,0,0,.42);transform:translateX(104%);transition:transform .22s ease;padding:24px;overflow:auto}
.inspection-drawer.open{transform:translateX(0)}
.drawer-close{position:sticky;top:0;float:right;border:1px solid var(--sn-line);border-radius:999px;background:rgba(4,14,27,.92);color:var(--sn-ink);width:38px;height:38px;cursor:pointer;font-size:1.45rem;line-height:1}
.inspect-value{display:inline-block;margin:4px 0 12px;padding:8px 12px;border:1px solid var(--sn-line);border-radius:999px;color:var(--sn-accent2);font-family:var(--sn-mono);background:rgba(77,209,255,.08)}
.evidence-card{border:1px solid var(--sn-line2);border-radius:14px;padding:10px;margin:8px 0;background:rgba(4,14,27,.48)}
.evidence-card b{color:var(--sn-accent2)}.evidence-card p{margin:5px 0 0;color:var(--sn-muted);font-size:.86rem;line-height:1.45}
.evidence-needed li::marker{color:var(--sn-green)}.counter-evidence li::marker{color:var(--sn-rose)}
.pdf-viewer-shell{border:1px solid var(--sn-line);border-radius:18px;overflow:hidden;background:rgba(4,14,27,.74);min-height:560px}.pdf-viewer-shell iframe{display:block;width:100%;height:min(78dvh,820px);border:0;background:#0b1d36}
.modal-backdrop,.progress-overlay{position:fixed;z-index:110;inset:0;background:rgba(0,8,18,.72);display:grid;place-items:center;padding:18px;backdrop-filter:blur(8px)}
.report-modal{width:min(820px,96vw);max-height:92dvh;overflow:auto}.report-preview-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:14px 0}.report-preview-grid label{border:1px solid var(--sn-line2);border-radius:13px;padding:10px;background:rgba(4,14,27,.46);color:var(--sn-soft)}
.report-preview-box{border:1px solid var(--sn-line);border-radius:16px;background:rgba(4,14,27,.56);padding:14px;color:var(--sn-soft);line-height:1.55;min-height:120px}
.progress-card{width:min(620px,96vw)}.sn-progress{height:13px;border:1px solid var(--sn-line);border-radius:999px;background:rgba(119,183,255,.1);overflow:hidden;margin:12px 0}.sn-progress i{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--sn-accent),var(--sn-accent2));transition:width .18s ease}.progress-card ol{margin:12px 0 0;color:var(--sn-muted);line-height:1.8}.progress-card li.done{color:var(--sn-green)}
@media(max-width:700px){.inspection-drawer{top:auto;bottom:0;right:0;left:0;width:100%;height:78dvh;border-left:none;border-top:1px solid var(--sn-line);transform:translateY(104%)}.inspection-drawer.open{transform:translateY(0)}.report-preview-grid{grid-template-columns:1fr}}