/* M02K09 · Damping and attenuation */
.attenuation-chapter{padding-top:74px;padding-bottom:50px}.k09-header{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(290px,.65fr);gap:34px;align-items:end}.k09-header h2{margin:.12em 0 .22em;font-size:clamp(3rem,6.6vw,6.5rem);line-height:.9;letter-spacing:-.055em}.k09-header h2 em{font-weight:400;color:var(--accent)}.k09-header .lead{max-width:860px}.k09-index{padding:24px;border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(145deg,color-mix(in srgb,var(--warm) 9%,var(--panel)),var(--panel));box-shadow:var(--shadow)}.k09-index>span{display:block;color:var(--warm);font-size:.75rem;text-transform:uppercase;letter-spacing:.13em}.k09-index>strong{display:block;margin:10px 0;font-family:"Cambria Math","STIX Two Math",Georgia,serif;font-size:clamp(1.7rem,2.8vw,2.55rem);font-weight:500}.k09-index p{margin:0;color:var(--muted);font-size:.88rem}
.attenuation-balance,.attenuation-complex,.attenuation-interpretation{padding-top:58px;padding-bottom:58px}.attenuation-equation-grid,.attenuation-lens-grid,.attenuation-complex-grid,.attenuation-interpret-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.attenuation-equation-card,.attenuation-lens-card,.attenuation-complex-card,.attenuation-interpret-card{padding:23px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--panel)}.attenuation-equation-card>span,.attenuation-complex-card>span,.lens-label{display:block;color:var(--accent);font-size:.73rem;text-transform:uppercase;letter-spacing:.11em}.attenuation-equation-card p,.attenuation-lens-card p,.attenuation-complex-card p,.attenuation-interpret-card p{margin:12px 0 0;color:var(--muted);font-size:.86rem}.attenuation-equation-card .equation,.attenuation-lens-card .equation,.attenuation-complex-card .equation{margin-top:14px}.attenuation-equation-card.primary,.attenuation-lens-card.primary,.attenuation-complex-card.primary,.attenuation-interpret-card.key{border-color:color-mix(in srgb,var(--accent) 38%,var(--line));background:linear-gradient(145deg,color-mix(in srgb,var(--accent) 8%,var(--panel)),var(--panel))}.attenuation-equation-card.loss-card{border-color:color-mix(in srgb,var(--warm) 40%,var(--line));background:linear-gradient(145deg,color-mix(in srgb,var(--warm) 7%,var(--panel)),var(--panel))}.attenuation-lens-card>strong{display:block;margin:10px 0 6px}.attenuation-lenses{padding:58px 0;background:color-mix(in srgb,var(--panel) 44%,transparent);border-block:1px solid var(--line)}.compact-math{font-size:clamp(.82rem,1.35vw,1rem)}
.attenuation-lab-section{padding:62px 0;background:linear-gradient(180deg,color-mix(in srgb,var(--panel) 36%,transparent),transparent 24%,transparent 76%,color-mix(in srgb,var(--panel) 32%,transparent));border-block:1px solid var(--line)}.attenuation-lab-shell{display:grid;grid-template-columns:minmax(235px,290px) minmax(0,1fr);gap:16px;align-items:start}.attenuation-controls{position:sticky;top:88px;display:grid;gap:14px;padding:18px;border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);box-shadow:var(--shadow)}.attenuation-preset-row{display:grid;grid-template-columns:repeat(3,1fr);gap:7px}.attenuation-preset-row button{min-height:36px;padding:7px;border:1px solid var(--line);border-radius:9px;background:var(--panel-2);color:var(--muted);font:inherit;font-size:.72rem;cursor:pointer}.attenuation-preset-row button:hover,.attenuation-preset-row button:focus-visible{border-color:var(--accent);color:var(--text)}.attenuation-actions{display:grid;grid-template-columns:1fr 1fr;gap:8px}.attenuation-main{display:grid;gap:12px;min-width:0}.attenuation-panel{border:1px solid var(--line);border-radius:var(--radius);background:var(--panel);overflow:hidden}.attenuation-panel-head{display:flex;justify-content:space-between;gap:16px;align-items:center;padding:16px 18px;border-bottom:1px solid var(--line)}.attenuation-panel-head>div>span{display:block;color:var(--muted);font-size:.72rem;text-transform:uppercase;letter-spacing:.1em}.attenuation-panel-head>div>strong{display:block;margin-top:4px}.attenuation-status{display:flex;align-items:center;gap:7px;color:var(--muted);font-size:.74rem}.attenuation-status i{width:8px;height:8px;border-radius:50%;background:var(--accent-3);box-shadow:0 0 12px color-mix(in srgb,var(--accent-3) 70%,transparent)}
.attenuation-wave-svg,.attenuation-decay-svg{display:block;width:100%;height:auto;background:radial-gradient(circle at 34% 20%,color-mix(in srgb,var(--warm) 5%,transparent),transparent 48%)}.attenuation-axis,.attenuation-decay-axis{stroke:var(--line-strong);stroke-width:1}.attenuation-wave{fill:none;stroke:var(--accent);stroke-width:2.25;stroke-linejoin:round;stroke-linecap:round}.attenuation-envelope{fill:none;stroke:var(--warm);stroke-width:1.45;stroke-dasharray:7 5}.attenuation-probe{stroke:var(--accent-3);stroke-width:1.35;stroke-dasharray:4 5}.attenuation-probe-dot{fill:var(--accent-3);stroke:var(--bg);stroke-width:2}.attenuation-probe-label{fill:var(--accent-3);font:600 13px/1.2 Inter,system-ui,sans-serif}.attenuation-svg-muted,.attenuation-decay-muted{fill:var(--muted);font:12px/1.2 Inter,system-ui,sans-serif}.attenuation-telemetry{display:grid;grid-template-columns:repeat(6,1fr);border-top:1px solid var(--line)}.attenuation-telemetry>div{padding:13px 11px;border-right:1px solid var(--line);min-width:0}.attenuation-telemetry>div:last-child{border-right:0}.attenuation-telemetry span{display:block;color:var(--muted);font-size:.68rem;line-height:1.25}.attenuation-telemetry strong{display:block;margin-top:5px;font-size:.82rem;font-variant-numeric:tabular-nums;white-space:nowrap}
.attenuation-detail-grid{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr);gap:12px}.attenuation-decay-amplitude,.attenuation-decay-power{fill:none;stroke-linecap:round;stroke-linejoin:round}.attenuation-decay-amplitude{stroke:var(--accent);stroke-width:3}.attenuation-decay-power{stroke:var(--warm);stroke-width:2.2;stroke-dasharray:7 5}.attenuation-decay-probe{stroke:var(--accent-3);stroke-width:1.2;stroke-dasharray:4 4}.attenuation-legend{display:flex;gap:18px;flex-wrap:wrap;padding:10px 16px;border-top:1px solid var(--line);color:var(--muted);font-size:.72rem}.attenuation-legend span{display:flex;align-items:center;gap:7px}.attenuation-legend i{width:22px;height:0;border-top:2px solid}.attenuation-legend i.amp{border-color:var(--accent)}.attenuation-legend i.pow{border-color:var(--warm);border-top-style:dashed}
.attenuation-budget{display:grid;gap:17px;padding:22px 18px}.budget-row>div:first-child{display:flex;justify-content:space-between;gap:12px;align-items:baseline}.budget-row span{color:var(--muted);font-size:.76rem}.budget-row strong{font-size:.78rem;font-weight:600;font-variant-numeric:tabular-nums}.budget-track{height:8px;margin-top:7px;border-radius:99px;background:var(--panel-2);overflow:hidden;border:1px solid var(--line)}.budget-track i{display:block;height:100%;width:100%;border-radius:inherit;background:linear-gradient(90deg,var(--accent),var(--accent-3));transform-origin:left}.attenuation-scale-grid{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line)}.attenuation-scale-grid>div{padding:13px 16px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.attenuation-scale-grid>div:nth-child(2n){border-right:0}.attenuation-scale-grid>div:nth-last-child(-n+2){border-bottom:0}.attenuation-scale-grid span{display:block;color:var(--muted);font-size:.7rem}.attenuation-scale-grid strong{display:block;margin-top:5px;font-size:.84rem;font-variant-numeric:tabular-nums}.attenuation-reading-card{padding:21px 22px;border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(145deg,color-mix(in srgb,var(--warm) 5%,var(--panel)),var(--panel))}.attenuation-reading-card h3{margin:7px 0 0}.attenuation-reading-card p{margin:12px 0 0;color:var(--muted);font-size:.88rem}.attenuation-interpret-card>span{color:var(--accent);font-family:"Cambria Math","STIX Two Math",Georgia,serif;font-size:1.35rem}.attenuation-next{margin-top:10px}
@media(max-width:1120px){.attenuation-lab-shell{grid-template-columns:1fr}.attenuation-controls{position:static;grid-template-columns:repeat(2,minmax(0,1fr))}.attenuation-preset-row,.attenuation-actions{align-self:end}.attenuation-telemetry{grid-template-columns:repeat(3,1fr)}.attenuation-telemetry>div:nth-child(3){border-right:0}.attenuation-telemetry>div:nth-child(-n+3){border-bottom:1px solid var(--line)}}
@media(max-width:980px){.k09-header{grid-template-columns:1fr}.k09-index{max-width:680px}.attenuation-equation-grid,.attenuation-lens-grid,.attenuation-complex-grid,.attenuation-interpret-grid{grid-template-columns:1fr 1fr}.attenuation-equation-card.primary,.attenuation-lens-card.primary,.attenuation-complex-card.primary{grid-column:1/-1}.attenuation-detail-grid{grid-template-columns:1fr}.attenuation-interpret-card:last-child{grid-column:1/-1}}
@media(max-width:680px){.attenuation-chapter{padding-top:56px;padding-bottom:42px}.k09-header h2{font-size:clamp(2.45rem,12vw,4.5rem)}.attenuation-balance,.attenuation-lenses,.attenuation-complex,.attenuation-lab-section,.attenuation-interpretation{padding-top:44px;padding-bottom:44px}.attenuation-equation-grid,.attenuation-lens-grid,.attenuation-complex-grid,.attenuation-interpret-grid{grid-template-columns:1fr}.attenuation-equation-card.primary,.attenuation-lens-card.primary,.attenuation-complex-card.primary,.attenuation-interpret-card:last-child{grid-column:auto}.attenuation-controls{grid-template-columns:1fr}.attenuation-preset-row,.attenuation-actions{grid-template-columns:repeat(3,1fr)}.attenuation-actions{grid-template-columns:1fr 1fr}.attenuation-panel-head{align-items:flex-start}.attenuation-status{padding-top:3px}.attenuation-telemetry{grid-template-columns:1fr 1fr}.attenuation-telemetry>div{border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.attenuation-telemetry>div:nth-child(2n){border-right:0}.attenuation-telemetry>div:nth-last-child(-n+2){border-bottom:0}.attenuation-scale-grid{grid-template-columns:1fr 1fr}.attenuation-wave-svg{min-height:235px}.attenuation-decay-svg{min-height:210px}}
@media(max-width:390px){.k09-index,.attenuation-equation-card,.attenuation-lens-card,.attenuation-complex-card,.attenuation-reading-card{padding:18px}.attenuation-controls{padding:14px}.attenuation-preset-row{grid-template-columns:1fr}.attenuation-preset-row button{min-height:34px}.attenuation-panel-head{padding:13px 14px}.attenuation-panel-head>div>strong{font-size:.84rem}.attenuation-telemetry>div{padding:11px 9px}.attenuation-telemetry strong{font-size:.75rem}.attenuation-wave-svg{min-height:220px}.attenuation-svg-muted,.attenuation-decay-muted{font-size:15px}.attenuation-probe-label{font-size:16px}.attenuation-decay-svg{min-height:205px}.attenuation-budget{padding:18px 14px}.budget-row>div:first-child{display:block}.budget-row strong{display:block;margin-top:3px}.attenuation-scale-grid>div{padding:11px 12px}.attenuation-actions .button{padding-inline:8px}}