@layer base, layout, components, responsive;
@layer base {
:root{--ink:#14243a;--muted:#5f6d80;--line:#dbe3ed;--paper:#fff;--ground:#f3f6fa;--nav:#14243a;--nav-muted:#a4b4c9;--accent:#365de4;--purple:#7254b7;--deeppink:#7e75dc;--radius:12px}
*{box-sizing:border-box}
body{margin:0;background:var(--ground);color:var(--ink);font-family:Inter,"Segoe UI",Arial,sans-serif;font-size:16px;line-height:1.55}
button,a,input{ -webkit-tap-highlight-color:transparent }
button,a{touch-action:manipulation}
button{font:inherit;cursor:pointer}
a{color:inherit}
button:focus-visible,a:focus-visible,[tabindex]:focus-visible{outline:3px solid #7395ff;outline-offset:4px}
[hidden]{display:none!important}
h1,h2,h3,p{margin-top:0}
h1{font-size:clamp(1.8rem,2.5vw,2.45rem);letter-spacing:-.035em;line-height:1.15;margin-bottom:14px;font-weight:620}
h2{font-size:1.35rem;line-height:1.3;font-weight:600}
h3{font-size:1rem;margin-top:30px;margin-bottom:14px}
.formula{font-family:"Cambria Math",Cambria,Georgia,serif;font-size:1.18rem}
.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip-link{position:fixed;top:-80px;left:16px;z-index:1000;padding:12px;background:white}.skip-link:focus{top:12px}
.eyebrow{font-size:.75rem;letter-spacing:.115em;line-height:1.5;font-weight:650}
}
@layer layout {
.app-shell{display:grid;grid-template-columns:284px minmax(0,1fr);min-height:100dvh}
.sidebar{background:var(--nav);color:#f5f8fd;padding:29px 17px 20px;position:sticky;top:0;height:100dvh;display:flex;flex-direction:column;z-index:30}
#step-nav{overflow:auto;min-height:0;scrollbar-width:thin;scrollbar-color:#455775 transparent;padding-right:3px;padding-bottom:12px}
.main-shell{min-width:0}
.topbar{height:78px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:16px;padding:0 38px;background:#fff}
#workspace{padding:39px 38px 20px;max-width:1600px;margin:auto}
.workspace-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:22px;margin-bottom:22px}
.workspace-heading .eyebrow{color:var(--accent);margin-bottom:13px}
.step-intro{color:var(--muted);max-width:750px;margin:0;font-size:1rem;line-height:1.65}
.context-strip{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;align-items:center;margin:0 0 21px;font-size:.875rem;color:var(--muted)}
.workspace-grid{display:grid;grid-template-columns:minmax(0,1fr) 238px;gap:28px;align-items:start}
.workspace-card{background:white;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;min-width:0;box-shadow:0 4px 18px #14243a04}
.details-rail{min-width:0}
.step-footer{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-top:26px}
}
@layer components {
.brand{display:flex;align-items:center;gap:12px;padding:0 13px 25px;text-decoration:none;font-size:1.17rem;font-weight:580;letter-spacing:-.02em;line-height:1.35}
.brand-mark{height:40px;width:40px;display:grid;place-items:center;flex-shrink:0;border:1px solid #698094;border-radius:11px;color:var(--deeppink);font:2rem Georgia,serif}
.brand-sub{display:block;font-size:.8rem;color:var(--nav-muted);font-weight:400;letter-spacing:0;margin-top:3px}
.sidebar-intro{display:flex;justify-content:space-between;align-items:center;border-top:1px solid #ffffff17;padding:21px 13px 9px;color:var(--nav-muted)}
.sidebar-intro .eyebrow{font-size:.7rem;letter-spacing:.1em}
.side-counter{font-size:.75rem}
.nav-group{font-size:.75rem;color:#8fa3bc;margin:17px 13px 7px}
.step-link{display:flex;align-items:center;gap:11px;text-decoration:none;min-height:42px;padding:9px 12px;margin-bottom:3px;border:1px solid transparent;border-radius:8px;font-size:.875rem;line-height:1.35;color:#d3deec}
.step-link:hover{background:#ffffff08}
.step-link[aria-current]{background:#284367;border-color:#466187;color:white}
.nav-number{font-size:.75rem;color:#8fa3bc;font-variant-numeric:tabular-nums;min-width:19px}
.step-link[aria-current] .nav-number{color:#b8d7ff}
.nav-title{flex:1}
.nav-dot{width:6px;height:6px;border:1px solid #6882a1;border-radius:50%;flex-shrink:0}
.step-link[aria-current] .nav-dot{background:#a7cfff;border-color:#a7cfff}
.sidebar-footer{border-top:1px solid #ffffff17;margin-top:auto;padding:19px 13px 0;display:flex;align-items:flex-start;gap:10px;font-size:.8125rem;color:#e4edf8}
.sidebar-footer .outline-dot{margin-top:7px;border-color:#8ea2bc}
.sidebar-footer div span{display:block;color:#91a5bf;font-size:.75rem;margin-top:2px}
.topbar-label{font-size:.875rem;font-weight:550;color:#334660}
.topbar-label>span:last-child{color:var(--muted);font-weight:400}
.topbar-divider{margin:0 13px;color:#bdc8d6}
.reference-button{background:white;border:1px solid var(--line);border-radius:8px;padding:8px 14px;display:flex;align-items:center;gap:10px;color:var(--ink);font-size:.875rem;white-space:nowrap}
.reference-button>span{font-size:1.25rem;color:var(--purple);line-height:1}
.reference-button:hover{background:#f7f9fd;border-color:#bac9de}
.status-badge{background:white;border:1px solid var(--line);border-radius:50px;display:inline-flex;align-items:center;gap:7px;font-size:.8125rem;padding:5px 11px;white-space:nowrap;color:var(--muted);margin-top:2px}
.outline-dot{width:7px;height:7px;border:1px solid #8291a5;display:inline-block;border-radius:50%;flex-shrink:0}
.context-type{padding-left:12px;border-left:2px solid #c8d5e7;color:#546986}
.tabs{display:flex;border-bottom:1px solid var(--line);padding:0 22px;gap:24px;overflow:auto}
.tab{background:transparent;border:none;border-bottom:2px solid transparent;color:var(--muted);padding:16px 0 14px;font-size:.875rem;white-space:nowrap}
.tab[aria-selected=true]{border-bottom-color:var(--accent);color:var(--accent);font-weight:600}
.tab-panel{min-height:447px}
.visual-canvas{min-height:383px;display:flex;flex-direction:column;background-image:radial-gradient(#cdd7e5 0.65px,transparent .65px);background-size:20px 20px;background-position:10px 10px;padding:18px 21px}
.canvas-topline,.canvas-bottomline{display:flex;align-items:center;justify-content:space-between;gap:16px;font-size:.75rem;color:#6c7c90}
.canvas-topline>span:first-child{background:white;padding:3px 7px;font-size:.8125rem;color:#536781}
.canvas-topline>span:last-child{font-size:.65rem;letter-spacing:.1em}
.canvas-bottomline{margin-top:auto;font-size:.7rem}
.canvas-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;min-height:282px;padding:18px 12px}
.empty-step{font-family:Georgia,serif;font-size:3.25rem;line-height:1.1;color:#c2cedf;margin:0 0 13px}
.canvas-empty h2{font-size:1.12rem;font-weight:550;margin:0 0 8px;background:#ffffffce}
.canvas-empty p{font-size:.875rem;color:var(--muted);margin:0 0 13px;background:#ffffffdf}
.empty-label{font-size:.75rem;border:1px dashed #c4cfe0;background:#fff;padding:3px 10px;border-radius:5px;color:#66788f}
.controls-placeholder{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:64px;padding:16px 24px;border-top:1px solid var(--line);font-size:.8125rem;color:var(--muted)}
.control-title{font-weight:550;color:#3d506a}
.detail-section{padding:8px 0 21px;margin-bottom:14px;border-bottom:1px solid var(--line)}
.detail-section:last-child{border-bottom:0}
.detail-section>.eyebrow{color:#75859a;font-size:.7rem;margin-bottom:17px}
#planned-views{list-style:none;margin:0;padding:0}
#planned-views li{display:flex;gap:12px;margin-bottom:16px;font-size:.875rem;line-height:1.55;color:#3d516c}
#planned-views li:last-child{margin:0}
.view-number{font-size:.7rem;line-height:1.9;color:#91a0b4;min-width:17px;font-variant-numeric:tabular-nums}
#guardrail{font-size:.875rem;color:#50637a;line-height:1.7;margin:0}
.status-line{display:flex;justify-content:space-between;gap:12px;font-size:.8125rem;color:#5e718b;margin-bottom:10px}
.status-line>span:last-child{font-size:.75rem;color:#7c8ba0}
.status-line:first-of-type>span:last-child{color:#375681}
.text-panel{padding:32px}
.text-panel>.eyebrow{color:#7b8ca5}
.text-panel>p:not(.eyebrow){color:var(--muted);font-size:.9375rem;max-width:680px}
.argument-outline{margin:29px 0;display:flex;flex-direction:column;gap:13px}
.argument-outline>div{border:1px dashed #d7dfeb;border-radius:8px;display:flex;gap:16px;padding:14px}
.argument-outline span{font-size:.8rem;color:#8493a6}
.argument-outline strong{font-size:.875rem;font-weight:450;color:#61738b}
.note{border-left:3px solid #bac9ed;background:#f6f8fd;padding:13px 17px;font-size:.875rem;color:#4f6380;line-height:1.65}
.connection-label{font-size:.75rem;letter-spacing:.04em;color:#7b8ca5;margin:22px 0 10px}
.connection-link{display:flex;align-items:center;gap:12px;border:1px solid var(--line);padding:12px 15px;margin-bottom:9px;border-radius:8px;text-decoration:none;font-size:.875rem}
.connection-link:hover{background:#f6f8fe;border-color:#adbfec}
.connection-number{color:#7a90b6;font-size:.8125rem}
.connection-arrow{margin-left:auto;color:var(--accent)}
.page-button{display:inline-flex;gap:12px;align-items:center;border:1px solid #cdd7e5;background:white;border-radius:8px;padding:10px 16px;text-decoration:none;font-size:.875rem;white-space:nowrap}
.page-button:hover{border-color:#a0b4de;background:#f8faff}
.page-button.primary{background:var(--ink);border-color:var(--ink);color:white}
.page-button.primary:hover{background:#294267}
.page-button.is-disabled{opacity:.35;cursor:default;pointer-events:none}
#step-position{font-size:.8125rem;color:#74859b}
.scope-note{font-size:.75rem;color:#7b8ba0;text-align:center;margin:22px 0 0;line-height:1.6}
.icon-button{border:1px solid var(--line);background:white;border-radius:8px;color:var(--ink);min-width:36px;height:36px;display:grid;place-items:center;font-size:1.35rem;flex-shrink:0}
.mobile-only{display:none}
dialog{border:1px solid #d3dce8;border-radius:16px;padding:0;width:min(720px,calc(100% - 28px));max-height:90dvh;color:var(--ink);box-shadow:0 30px 110px #07152733}
dialog::backdrop{background:#0d1b326e;backdrop-filter:blur(3px)}
.dialog-top{padding:24px 28px 20px;display:flex;justify-content:space-between;align-items:flex-start;border-bottom:1px solid var(--line);position:sticky;top:0;background:white;z-index:1}
.dialog-top .eyebrow{color:var(--accent);margin-bottom:8px}.dialog-top h2{margin:0}
.dialog-body{padding:24px 28px}
.dialog-body>p{color:var(--muted);font-size:.9375rem}
.reference-callout{border:1px solid #d2ddf5;background:#f5f8ff;border-radius:9px;padding:18px 20px}
.reference-callout .formula{font-size:1.4rem}.reference-callout p{font-size:.875rem;color:var(--muted);margin:8px 0 0}
.data-block{border:1px solid var(--line);border-radius:9px;padding:17px 20px;overflow:auto}
.data-block p{margin-bottom:10px}.matrix-line{display:flex;gap:17px;align-items:center;margin-top:17px}
.matrix{display:grid;grid-template-columns:1fr 1fr;gap:9px 26px;border-left:2px solid #8192aa;border-right:2px solid #8192aa;padding:7px 13px;font-family:Cambria,Georgia,serif;white-space:nowrap;font-size:1.05rem}
.notation-list{margin:0}.notation-row{display:grid;grid-template-columns:140px minmax(0,1fr);padding:14px 0;border-bottom:1px solid #e5eaf2;gap:18px}
.notation-row dt{font-size:1rem}.notation-row dd{margin:0}.notation-value{display:block;font-size:.9375rem;font-weight:500;font-variant-numeric:tabular-nums}.notation-meaning{display:block;font-size:.8125rem;color:var(--muted);margin-top:3px}
.space-list{display:grid;grid-template-columns:1fr 1fr;gap:10px;font-size:.8125rem}
.space-list>span{padding:11px 13px;background:#f5f7fb;border-radius:7px}.space-list b{display:block;margin-top:2px;font-weight:500;font-size:.9375rem}
.reference-footnote{font-size:.8125rem!important;margin-top:25px;margin-bottom:0}
.scrim{position:fixed;inset:0;background:#0b172b73;border:none;z-index:25}
}
@layer responsive {
@media(min-width:1500px){#workspace{padding-top:48px}.visual-canvas{min-height:440px}.canvas-empty{min-height:339px}}
@media(max-width:1190px){.app-shell{grid-template-columns:260px minmax(0,1fr)}.topbar{padding:0 26px}#workspace{padding:30px 26px 20px}.workspace-grid{grid-template-columns:minmax(0,1fr)}.details-rail{display:grid;grid-template-columns:1fr 1fr;gap:24px}.detail-section:last-child{display:none}.topbar-label>span{display:none}.canvas-topline>span:last-child{display:none}}
@media(max-width:760px){.app-shell{display:block}.sidebar{position:fixed;left:0;top:0;width:284px;transform:translateX(-100%);transition:transform .18s ease}.sidebar.is-open{transform:translateX(0)}.mobile-only{display:grid}.topbar{height:66px;padding:0 18px;gap:12px}.topbar-label{flex:1;font-size:.8125rem}.reference-button{padding:8px 10px;font-size:.8125rem}.reference-button>span{display:none}#workspace{padding:28px 18px 18px}.workspace-heading{gap:10px}h1{font-size:1.8rem}.workspace-heading .eyebrow{font-size:.65rem}.status-badge{font-size:.7rem;padding:4px 8px}.step-intro{font-size:.9375rem}.context-strip{font-size:.75rem}.context-type{padding-left:0;border:0}.visual-canvas{min-height:350px;padding:16px}.canvas-empty{min-height:254px}.canvas-topline{font-size:.75rem}.canvas-bottomline{font-size:.65rem}.controls-placeholder{align-items:flex-start;flex-direction:column;gap:4px;padding:14px 17px}.tabs{gap:23px;padding:0 17px}.tab{font-size:.875rem}.details-rail{gap:22px}.detail-section{margin-bottom:0;padding-bottom:14px}.detail-section>.eyebrow{font-size:.65rem}#planned-views li,#guardrail{font-size:.8125rem}.step-footer{gap:8px}.page-button{padding:10px 11px;font-size:.8125rem;gap:6px}#step-position{font-size:.7rem}.scope-note{font-size:.7rem}.text-panel{padding:25px 21px}.dialog-top,.dialog-body{padding:21px}.notation-row{grid-template-columns:110px minmax(0,1fr);gap:12px}.space-list{grid-template-columns:1fr}.matrix{gap:7px 13px;font-size:.95rem}}
@media(max-width:390px){.topbar-label{font-size:.75rem}.reference-button{font-size:.75rem}.topbar{padding:0 12px}#workspace{padding-left:14px;padding-right:14px}.details-rail{grid-template-columns:1fr}.workspace-heading{display:block}.status-badge{margin-top:14px}.matrix-line{gap:8px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
}