:root{
  --sp-cyan:var(--accent);--sp-violet:var(--accent-2);--sp-green:var(--accent-3);--sp-warm:var(--warm);
  --sp-surface:var(--panel);--sp-solid:var(--panel-solid);--sp-line:var(--line);--sp-strong:var(--line-strong);
}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.94em}
.sp-hero{padding:72px 0 42px;display:grid;grid-template-columns:minmax(0,1.25fr) minmax(320px,.75fr);gap:28px;align-items:start;scroll-margin-top:calc(var(--header-h) + 18px)}
.sp-hero :is(h1,h2){margin:10px 0 16px;font-size:clamp(2.55rem,5.7vw,5.2rem);line-height:.96;letter-spacing:-.055em}.sp-hero :is(h1,h2) em{font-style:normal;color:var(--accent)}
.sp-hero-copy>p{max-width:760px;color:var(--muted);font-size:1.04rem}.sp-hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}
.sp-hero-card,.sp-card,.sp-note,.sp-panel,.sp-controls,.sp-reading,.sp-boundary-grid article{border:1px solid var(--line);background:var(--panel);border-radius:var(--radius-sm)}
.sp-hero-card{padding:22px;box-shadow:var(--shadow)}.sp-hero-card>span,.sp-card>span,.sp-panel-head span,.sp-reading>span,.sp-boundary-grid article>span,.sp-control-head span{font-size:.72rem;letter-spacing:.09em;text-transform:uppercase;color:var(--accent);font-weight:800}
.sp-equation{margin-top:12px;padding:13px 14px;border:1px solid var(--line);border-radius:12px;background:color-mix(in srgb,var(--panel-solid) 74%,transparent);overflow-wrap:anywhere}.sp-equation.large{font-size:1.28rem}.sp-equation-line{display:inline-block;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.sp-mini-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-top:12px}.sp-mini-grid div{padding:10px;border-radius:10px;background:color-mix(in srgb,var(--panel-solid) 64%,transparent)}.sp-mini-grid span{display:block;color:var(--muted);font-size:.68rem}.sp-mini-grid strong{display:block;margin-top:4px;font-size:.8rem}
.sp-foundation,.sp-lab-section,.sp-boundary{padding-block:38px}.section-heading.compact{margin-bottom:24px}.sp-foundation-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.sp-card{padding:20px}.sp-card.primary{border-color:color-mix(in srgb,var(--accent) 44%,var(--line))}.sp-card h3{margin:7px 0 8px;font-size:1.08rem}.sp-card p,.sp-note p,.sp-boundary-grid p{margin:0;color:var(--muted);font-size:.9rem}.sp-note{margin-top:12px;padding:18px 20px;display:grid;grid-template-columns:210px minmax(0,1fr);gap:18px;align-items:start}.sp-note strong{color:var(--warm)}
.sp-lab-shell{display:grid;grid-template-columns:minmax(250px,310px) minmax(0,1fr);gap:14px;align-items:start}.sp-controls{padding:17px;position:sticky;top:calc(var(--header-h) + 12px)}.sp-control-head{display:flex;justify-content:space-between;gap:12px;align-items:start;margin-bottom:14px}.sp-control-head>div{display:grid;gap:3px}.sp-control-head strong{font-size:.9rem}.sp-status{font-size:.72rem!important;text-transform:none!important;letter-spacing:0!important;text-align:right;color:var(--warm)!important}
.sp-controls label{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:4px 10px;padding:12px 0;border-top:1px solid var(--line);font-size:.84rem}.sp-controls label>span{font-weight:700}.sp-controls output{color:var(--accent);font-variant-numeric:tabular-nums}.sp-controls input[type=range]{grid-column:1/-1;width:100%;accent-color:var(--accent)}
.sp-presets{margin:14px 0 0;padding:12px;border:1px solid var(--line);border-radius:12px}.sp-presets legend{padding:0 6px;color:var(--muted);font-size:.72rem}.sp-presets>div{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}.sp-presets button{min-height:34px;border:1px solid var(--line);border-radius:9px;background:var(--panel-solid);color:var(--text);cursor:pointer;font-size:.76rem}.sp-presets button:hover,.sp-presets button.is-active{border-color:var(--accent);color:var(--accent)}.sp-reset{width:100%;margin-top:10px}.sp-assumption{margin-top:14px;padding-top:14px;border-top:1px solid var(--line)}.sp-assumption strong{font-size:.78rem}.sp-assumption p{margin:6px 0 0;color:var(--muted);font-size:.76rem}
.sp-stage{min-width:0;display:grid;gap:14px}.sp-panel{padding:16px;min-width:0}.sp-panel-head{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;margin-bottom:10px}.sp-panel-head>div{display:grid;gap:3px}.sp-panel-head strong{font-size:.92rem}.sp-readout{text-align:right}.sp-readout span{display:block;color:var(--muted);font-size:.68rem}.sp-readout strong{display:block;margin-top:3px;color:var(--accent)}
.sp-spectrum-svg{width:100%;min-height:350px}.sp-wave-svg,.sp-window-svg{width:100%;min-height:310px}.sp-band-legend{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:6px;margin-top:8px}.sp-band-legend span{padding:6px 5px;text-align:center;border:1px solid var(--line);border-radius:8px;color:var(--muted);font-size:.68rem}
.sp-metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}.sp-metrics>div,.sp-checks article{padding:13px 14px;border:1px solid var(--line);border-radius:12px;background:var(--panel)}.sp-metrics span,.sp-checks span{display:block;color:var(--muted);font-size:.69rem}.sp-metrics strong,.sp-checks strong{display:block;margin-top:4px;font-size:.88rem;font-variant-numeric:tabular-nums}
.sp-detail-grid{display:grid;grid-template-columns:minmax(0,1.18fr) minmax(300px,.82fr);gap:14px}.sp-checks{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.sp-checks strong{color:var(--accent-3)}.sp-reading{padding:18px 20px}.sp-reading h3{margin:6px 0 7px;font-size:1.05rem}.sp-reading p{margin:0;color:var(--muted)}
.sp-boundary-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.sp-boundary-grid article{padding:18px}.sp-boundary-grid strong{display:block;margin:7px 0;font-size:.98rem}
/* SVG */
.sp-svg-axis,.sp-svg-grid{stroke:var(--line-strong);stroke-width:1}.sp-svg-grid{opacity:.55}.sp-svg-text{fill:var(--muted);font:14px ui-sans-serif,system-ui,sans-serif}.sp-svg-small{fill:var(--muted);font:12px ui-sans-serif,system-ui,sans-serif}.sp-svg-label{fill:var(--text);font:700 14px ui-sans-serif,system-ui,sans-serif}.sp-svg-accent{fill:var(--accent);font:800 14px ui-sans-serif,system-ui,sans-serif}.sp-band{stroke:color-mix(in srgb,var(--text) 8%,transparent);stroke-width:1}.sp-band-radio{fill:color-mix(in srgb,var(--accent) 18%,transparent)}.sp-band-micro{fill:color-mix(in srgb,var(--accent-2) 18%,transparent)}.sp-band-ir{fill:color-mix(in srgb,var(--warm) 20%,transparent)}.sp-band-visible{fill:color-mix(in srgb,var(--accent-3) 24%,transparent)}.sp-band-uv{fill:color-mix(in srgb,var(--accent-2) 27%,transparent)}.sp-band-xray{fill:color-mix(in srgb,var(--danger) 20%,transparent)}.sp-band-gamma{fill:color-mix(in srgb,var(--danger) 30%,transparent)}.sp-selection{fill:color-mix(in srgb,var(--accent) 20%,transparent);stroke:var(--accent);stroke-width:1}.sp-marker{stroke:var(--text);stroke-width:2}.sp-marker-dot{fill:var(--accent);stroke:var(--bg);stroke-width:3}.sp-wave-e{fill:none;stroke:var(--accent);stroke-width:3}.sp-wave-b{fill:none;stroke:var(--accent-2);stroke-width:2;stroke-dasharray:8 7}.sp-phase-marker{stroke:var(--warm);stroke-width:1.5;stroke-dasharray:5 5}.sp-window-band{fill:color-mix(in srgb,var(--accent) 18%,transparent);stroke:var(--accent);stroke-width:1.5}.sp-window-center{stroke:var(--warm);stroke-width:2}.sp-window-tick{stroke:var(--line-strong);stroke-width:1}
@media(max-width:900px){.sp-hero{grid-template-columns:1fr}.sp-lab-shell{grid-template-columns:1fr}.sp-controls{position:static}.sp-detail-grid{grid-template-columns:1fr}.sp-foundation-grid,.sp-boundary-grid{grid-template-columns:1fr}.sp-note{grid-template-columns:1fr}.sp-checks{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:640px){.sp-hero{padding-top:50px}.sp-hero :is(h1,h2){font-size:clamp(2.25rem,13vw,3.55rem)}.sp-mini-grid{grid-template-columns:1fr}.sp-metrics{grid-template-columns:repeat(2,minmax(0,1fr))}.sp-band-legend{grid-template-columns:repeat(2,minmax(0,1fr))}.sp-spectrum-svg{min-height:560px}.sp-wave-svg,.sp-window-svg{min-height:280px}.sp-panel{padding:12px}.sp-panel-head{flex-direction:column;gap:6px}.sp-readout{text-align:left}.sp-presets>div{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:380px){.sp-metrics,.sp-checks{grid-template-columns:1fr}.sp-hero-actions{display:grid}.sp-presets>div{grid-template-columns:1fr 1fr}}
/* C088 mobile intrinsic-width hardening */
.sp-hero > *,.sp-stage,.sp-panel,.sp-equation-line{min-width:0;max-width:100%}
.sp-equation-line{white-space:normal;overflow-wrap:anywhere}
@media(max-width:640px){.sp-hero :is(h1,h2){font-size:clamp(2.05rem,10vw,3.05rem)}}