/* M04K08 · Multi-layer systems */
.multilayer-hero{display:grid;grid-template-columns:minmax(0,1.16fr) minmax(330px,.84fr);gap:42px;align-items:center;padding-block:88px 74px;border-top:1px solid var(--line)}
.multilayer-hero-copy{min-width:0}.multilayer-hero :is(h1,h2){max-width:900px;margin:14px 0 20px;font-size:clamp(2.8rem,6vw,5.7rem);line-height:.96;letter-spacing:-.055em}.multilayer-hero :is(h1,h2) em{font-style:normal;color:var(--accent-2)}.multilayer-hero-copy>p{max-width:780px;margin:0;color:var(--muted);font-size:1.07rem}.multilayer-hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.multilayer-hero-card{padding:24px;border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(145deg,color-mix(in srgb,var(--accent-2) 8%,var(--panel)),var(--panel));box-shadow:var(--shadow)}.multilayer-hero-card>span{color:var(--accent-2);font-size:.76rem;font-weight:800;letter-spacing:.11em;text-transform:uppercase}.multilayer-hero-card>p{margin:14px 0 0;color:var(--muted)}
.multilayer-equation{display:flex;align-items:center;justify-content:center;min-height:72px;margin:16px 0;padding:14px 16px;border:1px solid var(--line);border-radius:16px;background:color-mix(in srgb,var(--bg) 42%,transparent);font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace;font-weight:700;letter-spacing:-.03em;text-align:center;overflow-wrap:anywhere}.multilayer-equation.large{min-height:92px;font-size:clamp(1.05rem,2.0vw,1.5rem)}.multilayer-hero-equation{display:grid;grid-template-columns:auto minmax(0,1fr);gap:12px;align-items:center;overflow-wrap:normal}.ml-eq-symbol{white-space:nowrap}.ml-fraction{display:grid;min-width:0;line-height:1.25;font-size:clamp(.86rem,1.55vw,1.14rem)}.ml-fraction>span{padding:5px 8px;white-space:nowrap}.ml-fraction>span+span{border-top:1px solid currentColor}
.multilayer-mini-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.multilayer-mini-grid>div{min-width:0;padding:11px;border:1px solid var(--line);border-radius:12px;background:color-mix(in srgb,var(--panel-solid) 64%,transparent)}.multilayer-mini-grid span{display:block;color:var(--muted);font-size:.68rem;text-transform:uppercase;letter-spacing:.07em}.multilayer-mini-grid strong{display:block;margin-top:4px;font-size:.88rem;overflow-wrap:anywhere}
.multilayer-composition,.multilayer-layer,.multilayer-takeaways{padding-block:78px}.multilayer-composition{border-top:1px solid var(--line)}.multilayer-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:28px}.multilayer-card{min-width:0;padding:20px;border:1px solid var(--line);border-radius:18px;background:var(--panel)}.multilayer-card.primary{border-color:color-mix(in srgb,var(--accent-2) 42%,var(--line));background:linear-gradient(145deg,color-mix(in srgb,var(--accent-2) 7%,var(--panel)),var(--panel))}.multilayer-card>span{color:var(--accent-2);font-size:.72rem;font-weight:800;letter-spacing:.09em;text-transform:uppercase}.multilayer-card p{margin:10px 0 0;color:var(--muted)}
.multilayer-note,.multilayer-caution{display:grid;grid-template-columns:auto 1fr;gap:18px;align-items:start;margin-top:18px;padding:18px 20px;border:1px solid var(--line);border-radius:16px;background:color-mix(in srgb,var(--panel) 78%,transparent)}.multilayer-note strong,.multilayer-caution strong{color:var(--accent-2);white-space:nowrap}.multilayer-note p,.multilayer-caution p{margin:0;color:var(--muted)}.multilayer-caution{border-color:color-mix(in srgb,var(--warm) 30%,var(--line))}.multilayer-caution strong{color:var(--warm)}
.multilayer-matrix-row{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:16px;align-items:stretch;margin-top:28px}.multilayer-matrix-card{min-width:0;padding:20px;border:1px solid var(--line);border-radius:18px;background:var(--panel)}.multilayer-matrix-card>span{color:var(--accent-2);font-size:.72rem;font-weight:800;letter-spacing:.09em;text-transform:uppercase}.multilayer-matrix-card p{margin:10px 0 0;color:var(--muted)}.multilayer-matrix-times{display:grid;place-items:center;color:var(--muted);font-size:1.4rem;font-weight:800}
.multilayer-lab-section{padding-block:80px;border-block:1px solid var(--line);background:linear-gradient(180deg,color-mix(in srgb,var(--accent-2) 3%,transparent),transparent 28%)}.multilayer-lab-shell{display:grid;grid-template-columns:330px minmax(0,1fr);gap:18px;align-items:start;margin-top:28px}.multilayer-controls{position:sticky;top:calc(var(--header-h) + 18px);padding:18px;border:1px solid var(--line);border-radius:20px;background:var(--panel);box-shadow:var(--shadow)}.multilayer-control{display:grid;gap:8px;padding:14px 0;border-bottom:1px solid var(--line)}.multilayer-control:first-child{padding-top:0}.multilayer-control label{display:flex;justify-content:space-between;gap:12px;align-items:baseline;font-weight:720}.multilayer-control output{color:var(--accent-2);font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace;font-size:.86rem}.multilayer-control input[type="range"]{width:100%;accent-color:var(--accent-2)}.multilayer-control small{color:var(--muted)}.multilayer-preset-set{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px;margin-top:14px}.multilayer-preset-set button,.multilayer-actions button{min-width:0;padding:10px 11px;border:1px solid var(--line);border-radius:11px;background:var(--panel-solid);color:var(--text);font:inherit;font-size:.8rem;font-weight:720;cursor:pointer}.multilayer-preset-set button:hover,.multilayer-preset-set button:focus-visible,.multilayer-actions button:hover,.multilayer-actions button:focus-visible{border-color:var(--line-strong)}.multilayer-preset-set button.is-active{border-color:color-mix(in srgb,var(--accent-2) 60%,var(--line));background:color-mix(in srgb,var(--accent-2) 12%,var(--panel-solid))}.multilayer-actions{display:grid;grid-template-columns:1fr;margin-top:9px}.multilayer-actions button{border-color:color-mix(in srgb,var(--accent-2) 42%,var(--line))}.multilayer-lab-note{margin:14px 0 0;color:var(--muted);font-size:.82rem}
.multilayer-stage{display:grid;gap:16px;min-width:0}.multilayer-panel{min-width:0;border:1px solid var(--line);border-radius:20px;background:var(--panel);overflow:hidden}.multilayer-panel-head{display:flex;justify-content:space-between;align-items:center;gap:14px;padding:15px 18px;border-bottom:1px solid var(--line)}.multilayer-panel-head>div:first-child{display:grid;gap:3px}.multilayer-panel-head span{color:var(--muted);font-size:.73rem;text-transform:uppercase;letter-spacing:.08em}.multilayer-panel-head strong{font-size:1rem}.multilayer-status{max-width:52%;padding:7px 10px;border:1px solid var(--line);border-radius:999px;color:var(--muted);font-size:.77rem;font-weight:760;text-align:right}.multilayer-status.is-matched{color:var(--accent-2);border-color:color-mix(in srgb,var(--accent-2) 42%,var(--line))}.multilayer-status.is-reflecting{color:var(--warm);border-color:color-mix(in srgb,var(--warm) 38%,var(--line))}
.multilayer-stack-svg,.multilayer-phasor-svg,.multilayer-spectrum-svg{width:100%;height:auto;background:color-mix(in srgb,var(--bg) 27%,transparent)}.multilayer-stack-svg{min-height:330px}.multilayer-phasor-svg{min-height:310px}.multilayer-spectrum-svg{min-height:310px}.ml-region-1{fill:color-mix(in srgb,var(--accent) 4%,transparent)}.ml-region-2{fill:color-mix(in srgb,var(--accent-2) 5%,transparent)}.ml-region-3{fill:color-mix(in srgb,var(--accent-3) 4%,transparent)}.ml-interface{stroke:var(--line-strong);stroke-width:2}.ml-arrow-i,.ml-arrow-t,.ml-arrow-f,.ml-arrow-b,.ml-arrow-r{fill:none;stroke-linecap:round}.ml-arrow-i{stroke:var(--accent);stroke-width:5}.ml-arrow-r{stroke:var(--warm);stroke-width:4}.ml-arrow-f{stroke:var(--accent-2);stroke-width:4}.ml-arrow-b{stroke:var(--accent-2);stroke-width:3;stroke-dasharray:8 5}.ml-arrow-t{stroke:var(--accent-3);stroke-width:5}.ml-svg-label{fill:var(--text);font-size:16px;font-weight:760}.ml-svg-sub{fill:var(--muted);font-size:14px;font-weight:650}.ml-phase-brace{stroke:var(--accent-2);stroke-width:2;fill:none}.ml-axis{stroke:var(--line-strong);stroke-width:1.4}.ml-unit-circle{stroke:var(--line);stroke-width:1.5;fill:none}.ml-ph-r12{stroke:var(--warm);stroke-width:4}.ml-ph-return{stroke:var(--accent-2);stroke-width:4}.ml-ph-gamma{stroke:var(--accent);stroke-width:4}.ml-ph-point{fill:var(--accent)}.ml-curve{fill:none;stroke:var(--accent-2);stroke-width:3}.ml-curve-guide{stroke:var(--line);stroke-width:1.2;stroke-dasharray:5 6}.ml-curve-point{fill:var(--accent);stroke:var(--panel-solid);stroke-width:3}.ml-curve-axis{stroke:var(--line-strong);stroke-width:1.5}.ml-curve-text{fill:var(--muted);font-size:13px;font-weight:650}
.multilayer-legend{display:flex;flex-wrap:wrap;gap:12px;padding:12px 16px 15px;border-top:1px solid var(--line);color:var(--muted);font-size:.78rem}.multilayer-legend span{display:inline-flex;align-items:center;gap:7px}.multilayer-legend i{width:18px;height:3px;border-radius:999px;background:var(--accent)}.multilayer-legend span:nth-child(2) i{background:var(--warm)}.multilayer-legend span:nth-child(3) i{background:var(--accent-2)}.multilayer-legend span:nth-child(4) i{background:var(--accent-3)}
.multilayer-metrics{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));border-top:1px solid var(--line)}.multilayer-metrics>div{min-width:0;padding:14px 13px;border-right:1px solid var(--line)}.multilayer-metrics>div:last-child{border-right:0}.multilayer-metrics span{display:block;color:var(--muted);font-size:.66rem;text-transform:uppercase;letter-spacing:.06em}.multilayer-metrics strong{display:block;margin-top:5px;font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace;font-size:.85rem;overflow-wrap:anywhere}.multilayer-detail-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:16px}.multilayer-reading{padding:18px}.multilayer-reading h3{margin:0 0 10px;font-size:1.12rem}.multilayer-reading p{margin:0;color:var(--muted)}.multilayer-check{display:grid;gap:8px;margin-top:16px;padding:14px;border:1px solid var(--line);border-radius:14px;background:color-mix(in srgb,var(--bg) 25%,transparent)}.multilayer-check span{display:block;color:var(--muted);font-size:.69rem;text-transform:uppercase;letter-spacing:.07em}.multilayer-check strong{font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace;font-size:.82rem;overflow-wrap:anywhere}.multilayer-cross-reference{max-width:860px;margin:24px auto 0;color:var(--muted);font-size:.9rem;text-align:center}.multilayer-cross-reference a{color:var(--text)}
@media(max-width:980px){.multilayer-hero{grid-template-columns:1fr}.multilayer-lab-shell{grid-template-columns:1fr}.multilayer-controls{position:static}.multilayer-detail-grid{grid-template-columns:1fr}.multilayer-metrics{grid-template-columns:repeat(3,minmax(0,1fr))}.multilayer-metrics>div:nth-child(3){border-right:0}.multilayer-metrics>div:nth-child(-n+3){border-bottom:1px solid var(--line)}}
@media(max-width:720px){.multilayer-hero-equation{gap:7px;padding-inline:10px}.ml-fraction{font-size:clamp(.76rem,3.15vw,.95rem)}.ml-fraction>span{padding-inline:4px}.multilayer-hero{padding-block:66px 58px}.multilayer-hero :is(h1,h2){font-size:clamp(2.45rem,13vw,4.2rem)}.multilayer-grid{grid-template-columns:1fr}.multilayer-matrix-row{grid-template-columns:1fr}.multilayer-matrix-times{min-height:20px}.multilayer-note,.multilayer-caution{grid-template-columns:1fr;gap:8px}.multilayer-note strong,.multilayer-caution strong{white-space:normal}.multilayer-mini-grid{grid-template-columns:1fr}.multilayer-panel-head{align-items:flex-start;flex-direction:column}.multilayer-status{max-width:none;text-align:left}.multilayer-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.multilayer-metrics>div:nth-child(3){border-right:1px solid var(--line)}.multilayer-metrics>div:nth-child(2n){border-right:0}.multilayer-metrics>div:nth-child(-n+4){border-bottom:1px solid var(--line)}.multilayer-stack-svg{min-height:280px}.multilayer-phasor-svg,.multilayer-spectrum-svg{min-height:260px}.ml-svg-label{font-size:26px}.ml-svg-sub{font-size:22px}.ml-curve-text{font-size:18px}}
@media(max-width:430px){.multilayer-lab-section{padding-block:64px}.multilayer-controls{padding:15px}.multilayer-preset-set{grid-template-columns:1fr 1fr}.multilayer-metrics{grid-template-columns:1fr}.multilayer-metrics>div{border-right:0!important;border-bottom:1px solid var(--line)!important}.multilayer-metrics>div:last-child{border-bottom:0!important}.multilayer-stack-svg{min-height:245px}.multilayer-phasor-svg,.multilayer-spectrum-svg{min-height:230px}}