.app-backdrop { position: fixed; inset: 0; pointer-events: none; overflow: hidden; z-index: 0; }
.app-backdrop::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(var(--grid-line) 1px, transparent 1px), linear-gradient(90deg, var(--grid-line) 1px, transparent 1px); background-size: 64px 64px; mask-image: linear-gradient(to bottom, rgba(0,0,0,.5), transparent 72%); }
.app-backdrop span { position: absolute; width: min(52vw, 780px); height: min(52vw, 780px); right: -20vw; top: -26vw; border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent); border-radius: 50%; }
.app-backdrop i { position: absolute; width: 180px; height: 1px; right: 11vw; top: 18vh; background: linear-gradient(90deg, transparent, var(--accent), transparent); opacity: .32; }
.app-shell { position: relative; z-index: 1; display: grid; grid-template-columns: var(--rail-w) minmax(0,1fr); min-height: 100vh; }
.side-rail { height: 100vh; position: sticky; top: 0; padding: 18px 14px 20px; border-right: 1px solid var(--line); display: flex; flex-direction: column; background: color-mix(in srgb, var(--bg-elevated) 94%, transparent); backdrop-filter: blur(12px); }
.brand { display: flex; align-items: center; gap: 11px; min-height: 48px; padding: 2px 8px; }
.brand-mark { width: 34px; height: 34px; display: grid; place-items: center; background: var(--text); color: var(--bg); border-radius: 10px 10px 10px 3px; }
.brand-mark svg { width: 23px; height: 23px; fill: none; stroke: currentColor; stroke-width: 1.5; }
.brand-type { display: grid; line-height: 1; }
.brand-type strong { font-size: 15px; letter-spacing: .16em; }
.brand-type small { margin-top: 6px; font-size: 10px; color: var(--text-3); letter-spacing: .04em; }
.primary-nav { display: grid; gap: 4px; margin-top: 38px; }
.nav-link { min-height: 46px; display: grid; grid-template-columns: 34px 1fr; align-items: center; padding: 4px 8px; border-radius: var(--radius-s); color: var(--text-2); font-weight: 650; font-size: 14px; transition: color var(--dur-fast), background var(--dur-fast); }
.nav-link:hover { color: var(--text); background: var(--surface-2); }
.nav-link.active { color: var(--text); background: var(--surface); box-shadow: inset 0 0 0 1px var(--line); }
.nav-glyph { width: 28px; height: 28px; display: grid; place-items: center; border: 1px solid var(--line); border-radius: 8px; font: 700 11px/1 var(--font-mono); }
.nav-link.active .nav-glyph { background: var(--accent); border-color: var(--accent); color: #171816; }
.rail-footer { margin-top: auto; display: grid; gap: 10px; padding: 10px 8px; }
.rail-utility { text-align: left; padding: 8px 0; color: var(--text-2); background: transparent; font-size: 12px; }
.version-chip { color: var(--text-3); font: 600 10px/1 var(--font-mono); }
.workspace { min-width: 0; display: flex; flex-direction: column; min-height: 100vh; }
.context-header { height: var(--header-h); display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 0 var(--page-gutter); border-bottom: 1px solid color-mix(in srgb, var(--line) 78%, transparent); position: sticky; top: 0; z-index: 30; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(16px); }
.context-copy { display: grid; line-height: 1.15; }
.context-copy strong { font-size: 14px; }
.context-kicker { font: 700 9px/1 var(--font-mono); color: var(--text-3); letter-spacing: .12em; margin-bottom: 4px; }
.header-actions { display: flex; align-items: center; gap: 8px; }
.profile-pill { min-height: 44px; display: flex; align-items: center; gap: 9px; padding: 7px 12px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-pill); font-size: 13px; font-weight: 700; }
.profile-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--signal); box-shadow: 0 0 0 4px var(--signal-soft); }
#appView { flex: 1; width: 100%; min-width: 0; }
.page { width: min(100%, var(--shell-max)); margin: 0 auto; padding: clamp(28px, 5vw, 72px) var(--page-gutter) 96px; }
.reading-page { width: min(100%, calc(var(--reading-max) + var(--page-gutter) * 2)); }
.lab-page { width: min(100%, calc(var(--lab-max) + var(--page-gutter) * 2)); }
.site-footer { display: flex; justify-content: space-between; gap: 20px; padding: 24px var(--page-gutter) 34px; border-top: 1px solid var(--line); font-size: 11px; }
.site-footer p { margin: 0; font-size: inherit; max-width: 720px; }
.site-footer a { color: var(--text-2); text-decoration: underline; text-underline-offset: 3px; }
.mobile-nav { display: none; }
.boot-screen { min-height: calc(100vh - var(--header-h) - 120px); display: grid; align-content: center; justify-items: start; width: min(100%, 700px); padding: var(--page-gutter); margin: 0 auto; }
.boot-screen h1 { font-size: var(--fs-5); margin-bottom: 10px; }
.boot-screen p { max-width: 500px; }
.boot-sequence { display: flex; align-items: center; gap: 10px; font: 700 10px/1 var(--font-mono); color: var(--text-3); margin-bottom: 22px; }
.boot-sequence i { width: 120px; height: 1px; background: var(--line-strong); position: relative; overflow: hidden; }
.boot-sequence i::after { content: ""; position: absolute; inset: 0; width: 38%; background: var(--accent); animation: boot 1.2s var(--ease-standard) infinite alternate; }
@keyframes boot { from { transform: translateX(-100%); } to { transform: translateX(260%); } }