*,*:before,*:after{box-sizing:border-box}:root{font-family:Inter,system-ui,-apple-system,sans-serif;line-height:1.5;font-weight:400;color-scheme:dark;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}body{margin:0;min-width:320px;min-height:100vh;background:#0d0d14}h1,h2,h3{margin:0}input[type=number]::-webkit-inner-spin-button,input[type=number]::-webkit-outer-spin-button{opacity:.4}select option{background:#13131f;color:#e2e8f0}:root{--bg: #f0f4f8;--surface: #ffffff;--surface-deep: #f0f4f8;--border: #dde4ef;--border-input: #c8d4e4;--text: #2a3a52;--text-bright: #0a1828;--text-card: #1a2a40;--text-dim: #546878;--text-dimmer: #6a8099;--text-dimmest: #7a90a8;--text-footer: #94a8be;--accent: #00aa55;--accent-glow: #00ff88;--accent-blue: #0099cc;--header-bg: rgba(240, 244, 248, .95);--mobile-nav-bg: rgba(240, 244, 248, .98);--grid-line: rgba(0, 170, 85, .04);--toggle-lp-bg: rgba(0, 170, 85, .08);--toggle-lp-border: #00aa55;--toggle-lp-color: #00aa55;--toggle-lp-shadow: rgba(0, 170, 85, .15);--toggle-hp-bg: rgba(0, 153, 204, .08);--toggle-hp-border: #0099cc;--toggle-hp-color: #0099cc;--toggle-hp-shadow: rgba(0, 153, 204, .12);--result-highlight-bg: rgba(0, 170, 85, .05);--result-highlight-border:rgba(0, 170, 85, .25);--solving-bg: rgba(0, 170, 85, .05);--solving-border: rgba(0, 170, 85, .18)}[data-theme=dark]{--bg: #06060f;--surface: #0b0b1a;--surface-deep: #06060f;--border: #111128;--border-input: #1a1a35;--text: #b8c8e0;--text-bright: #e0eaf8;--text-card: #c0d0e8;--text-dim: #3d5070;--text-dimmer: #2a3a58;--text-dimmest: #2a3a58;--text-footer: #1e2d45;--accent: #00ff88;--accent-glow: #00ff88;--accent-blue: #00bfff;--header-bg: rgba(6, 6, 15, .92);--mobile-nav-bg: rgba(6, 6, 15, .97);--grid-line: rgba(0, 255, 136, .035);--toggle-lp-bg: rgba(0, 255, 136, .08);--toggle-lp-border: #00ff88;--toggle-lp-color: #00ff88;--toggle-lp-shadow: rgba(0, 255, 136, .12);--toggle-hp-bg: rgba(0, 191, 255, .08);--toggle-hp-border: #00bfff;--toggle-hp-color: #00bfff;--toggle-hp-shadow: rgba(0, 191, 255, .1);--result-highlight-bg: rgba(0, 255, 136, .04);--result-highlight-border:rgba(0, 255, 136, .3);--solving-bg: rgba(0, 255, 136, .04);--solving-border: rgba(0, 255, 136, .12)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}.app{min-height:100vh;display:flex;flex-direction:column;background-color:var(--bg);background-image:linear-gradient(var(--grid-line) 1px,transparent 1px),linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);background-size:40px 40px;color:var(--text);transition:background-color .2s,color .2s}.main{flex:1;max-width:1100px;width:100%;margin:0 auto;padding:0 1.5rem 4rem}.header{border-bottom:1px solid var(--border);background:var(--header-bg);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);position:sticky;top:0;z-index:10}.header-inner{max-width:1100px;margin:0 auto;padding:0 1.5rem;height:56px;display:flex;align-items:center;justify-content:space-between}.logo-brand{display:flex;align-items:center;gap:.6rem;text-decoration:none}.logo-text{font-weight:700;font-size:.95rem;color:var(--accent);letter-spacing:.05em;font-family:JetBrains Mono,Fira Code,monospace}.nav-links--desktop{display:flex;align-items:center;gap:1.5rem}.nav-links--desktop a,.nav-links a{color:var(--text-dim);font-size:.8rem;text-decoration:none;transition:color .2s;font-family:JetBrains Mono,Fira Code,monospace;letter-spacing:.03em}.nav-links--desktop a:hover,.nav-links a:hover{color:var(--text)}.nav-links--desktop a.nav-active,.nav-links a.nav-active{color:var(--accent)}.theme-toggle{background:none;border:1px solid var(--border);border-radius:5px;color:var(--text-dim);cursor:pointer;padding:.25rem .4rem;display:flex;align-items:center;justify-content:center;transition:color .2s,border-color .2s;line-height:1}.theme-toggle:hover{color:var(--accent);border-color:var(--accent)}.lang-toggle{display:flex;align-items:center;gap:.25rem;margin-left:1.5rem;border-left:1px solid var(--border);padding-left:1.5rem}.lang-btn{background:none;border:none;color:var(--text-dim);font-size:.75rem;font-family:JetBrains Mono,Fira Code,monospace;letter-spacing:.05em;cursor:pointer;padding:.2rem .3rem;transition:color .2s}.lang-btn:hover{color:var(--text)}.lang-btn--active{color:var(--accent)}.lang-sep{color:var(--border-input);font-size:.7rem}.page-breadcrumb{display:flex;align-items:center;gap:.5rem;padding:1.25rem 0 0;font-size:.75rem;color:var(--text-dim);font-family:JetBrains Mono,Fira Code,monospace}.page-breadcrumb a{color:var(--text-dim);text-decoration:none;transition:color .2s}.page-breadcrumb a:hover{color:var(--accent)}.page-breadcrumb span:last-child{color:var(--text-dimmer)}.hero{padding:2.5rem 0 1.5rem;text-align:center}.hero h1{font-size:clamp(1.8rem,4vw,2.4rem);font-weight:700;margin:0 0 .6rem;color:var(--text-bright);letter-spacing:-.02em}.hero-sub{color:var(--text-dim);font-size:.85rem;margin:0;font-family:JetBrains Mono,Fira Code,monospace}.home-hero{padding:3.5rem 0 2.5rem;text-align:center}.home-hero h1{font-size:clamp(1.8rem,4vw,2.6rem);font-weight:700;margin:0 0 .75rem;color:var(--text-bright);letter-spacing:-.02em}.toggle-group{display:flex;justify-content:center;gap:.5rem;margin:1.5rem 0;flex-wrap:wrap}.toggle-btn{padding:.45rem 1.2rem;border-radius:5px;border:1px solid var(--border);background:var(--surface);color:var(--text-dim);font-size:.82rem;font-weight:500;cursor:pointer;transition:all .15s;font-family:JetBrains Mono,Fira Code,monospace;letter-spacing:.03em}.toggle-btn:hover{border-color:var(--text-dimmer);color:var(--text)}.toggle-btn.active-lp{background:var(--toggle-lp-bg);border-color:var(--toggle-lp-border);color:var(--toggle-lp-color);box-shadow:0 0 10px var(--toggle-lp-shadow)}.toggle-btn.active-hp{background:var(--toggle-hp-bg);border-color:var(--toggle-hp-border);color:var(--toggle-hp-color);box-shadow:0 0 10px var(--toggle-hp-shadow)}.card{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:1.5rem;margin-bottom:1rem}.card-title{font-size:.68rem;font-weight:600;color:var(--text-dimmer);margin:0 0 1.25rem;text-transform:uppercase;letter-spacing:.1em;font-family:JetBrains Mono,Fira Code,monospace}.grid-top{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-bottom:1rem}.side-col{display:flex;flex-direction:column;gap:1rem}.inputs-card{display:flex;flex-direction:column}.input-group{margin-bottom:1.4rem}.input-group:last-child{margin-bottom:0}.input-group label{display:block;font-size:.75rem;color:var(--text-dim);margin-bottom:.5rem;font-weight:500;font-family:JetBrains Mono,Fira Code,monospace;letter-spacing:.03em}.input-row{display:flex;gap:.5rem;margin-bottom:.6rem}.value-input{flex:1;background:var(--surface-deep);border:1px solid var(--border-input);border-radius:6px;color:var(--text-bright);font-size:1rem;padding:.5rem .75rem;font-family:JetBrains Mono,Fira Code,monospace;transition:border-color .15s,box-shadow .15s;outline:none}.value-input:focus{border-color:var(--accent);box-shadow:0 0 0 1px color-mix(in srgb,var(--accent) 15%,transparent)}.unit-select{background:var(--surface-deep);border:1px solid var(--border-input);border-radius:6px;color:var(--text-dim);font-size:.82rem;padding:.5rem;cursor:pointer;outline:none;font-family:JetBrains Mono,Fira Code,monospace;transition:border-color .15s}.unit-select:focus{border-color:var(--accent)}.unit-label{display:flex;align-items:center;padding:0 .75rem;background:var(--surface-deep);border:1px solid var(--border-input);border-radius:6px;color:var(--text-dim);font-size:.82rem;font-family:JetBrains Mono,Fira Code,monospace;white-space:nowrap}.slider{-webkit-appearance:none;appearance:none;width:100%;height:3px;border-radius:2px;outline:none;cursor:pointer;background:var(--border)}.slider.lowpass::-webkit-slider-thumb{-webkit-appearance:none;width:14px;height:14px;border-radius:50%;background:var(--accent);cursor:pointer;box-shadow:0 0 8px color-mix(in srgb,var(--accent) 60%,transparent)}.slider.highpass::-webkit-slider-thumb{-webkit-appearance:none;width:14px;height:14px;border-radius:50%;background:var(--accent-blue);cursor:pointer;box-shadow:0 0 8px color-mix(in srgb,var(--accent-blue) 50%,transparent)}.slider.lowpass::-webkit-slider-runnable-track{background:linear-gradient(to right,color-mix(in srgb,var(--accent) 35%,transparent),var(--border));height:3px;border-radius:2px}.slider.highpass::-webkit-slider-runnable-track{background:linear-gradient(to right,color-mix(in srgb,var(--accent-blue) 35%,transparent),var(--border));height:3px;border-radius:2px}.results-grid{display:flex;flex-direction:column;gap:.4rem}.result-row{display:flex;justify-content:space-between;align-items:center;padding:.5rem .75rem;border-radius:5px;background:var(--surface-deep);border:1px solid var(--border)}.result-highlight{border-color:var(--result-highlight-border);background:var(--result-highlight-bg)}.result-label{font-size:.75rem;color:var(--text-dim);font-family:JetBrains Mono,Fira Code,monospace}.result-value{font-size:.9rem;font-weight:600;color:var(--text-bright);font-family:JetBrains Mono,Fira Code,monospace}.result-highlight .result-value{color:var(--accent)}.invalid-msg{color:var(--text-dim);font-size:.82rem;text-align:center;margin:1rem 0;font-family:JetBrains Mono,Fira Code,monospace}.circuit-card{flex:1;display:flex;align-items:center;justify-content:center}.circuit-wrapper{text-align:center;width:100%}.circuit-svg{width:100%;max-width:320px;height:auto}.circuit-label{font-size:.68rem;color:var(--text-dimmer);margin:.5rem 0 0;font-family:JetBrains Mono,Fira Code,monospace;letter-spacing:.06em;text-transform:uppercase}.bode-card{margin-bottom:1rem}.edu-grid{display:grid;grid-template-columns:1fr 1fr;gap:2rem}.edu-text{font-size:.85rem;color:var(--text-dim);line-height:1.75;margin:0 0 1rem}.formula-box{background:var(--surface-deep);border:1px solid var(--border);border-left:2px solid var(--accent);border-radius:0 6px 6px 0;padding:.65rem 1rem;margin-bottom:.6rem}.formula-label{font-size:.65rem;color:var(--text-dimmer);text-transform:uppercase;letter-spacing:.1em;margin:0 0 .25rem;font-family:JetBrains Mono,Fira Code,monospace}.formula{font-size:.88rem;color:var(--accent);font-family:JetBrains Mono,Fira Code,monospace}.edu-subtitle{font-size:.65rem;font-weight:600;color:var(--text-dimmer);margin:0 0 .5rem;text-transform:uppercase;letter-spacing:.1em;font-family:JetBrains Mono,Fira Code,monospace}.edu-list{list-style:none;padding:0;margin:0 0 1.25rem}.edu-list li{font-size:.82rem;color:var(--text-dim);padding:.3rem 0 .3rem .85rem;border-left:1px solid var(--border);margin-bottom:.2rem;line-height:1.6}.tools-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;margin-bottom:3rem;border:1px solid var(--border);border-radius:8px;overflow:hidden;background:var(--border)}.tool-card{background:var(--surface);padding:1.5rem;display:flex;gap:1rem;align-items:flex-start;text-decoration:none;transition:background .15s}.tool-card--ready{cursor:pointer}.tool-card--ready:hover{background:color-mix(in srgb,var(--accent) 4%,var(--surface))}.tool-card--soon{opacity:.3;cursor:default}.tool-card-icon{flex-shrink:0;width:38px;height:38px;background:var(--surface-deep);border:1px solid var(--border);border-radius:6px;display:flex;align-items:center;justify-content:center}.tool-card-body{flex:1;min-width:0}.tool-card-header{display:flex;align-items:center;justify-content:space-between;gap:.5rem;margin-bottom:.35rem}.tool-card-name{font-size:.88rem;font-weight:600;color:var(--text-card);margin:0}.tool-card-badge{font-size:.65rem;font-weight:500;color:var(--text-dim);background:transparent;border:1px solid var(--border-input);border-radius:3px;padding:.1rem .4rem;white-space:nowrap;font-family:JetBrains Mono,Fira Code,monospace}.tool-card-badge--soon{color:var(--border-input);background:transparent;border-color:var(--border)}.tool-card-desc{font-size:.78rem;color:var(--text-dimmest);margin:0;line-height:1.55}.solving-for{margin-top:1.5rem;padding:.6rem 1rem;background:var(--solving-bg);border:1px solid var(--solving-border);border-radius:5px;display:flex;justify-content:space-between;align-items:center}.solving-label{font-size:.65rem;color:var(--text-dimmer);text-transform:uppercase;letter-spacing:.1em;font-family:JetBrains Mono,Fira Code,monospace}.solving-value{font-size:.82rem;font-weight:600;color:var(--accent);font-family:JetBrains Mono,Fira Code,monospace}.band-selector{display:flex;flex-wrap:wrap;gap:.35rem;margin-bottom:.5rem}.band-btn{width:22px;height:22px;border-radius:4px;border:2px solid transparent;background:var(--band-color);cursor:pointer;transition:transform .1s,border-color .15s;outline:none}.band-btn:hover{transform:scale(1.15)}.band-btn--active{border-color:var(--accent);transform:scale(1.2);box-shadow:0 0 6px color-mix(in srgb,var(--accent) 40%,transparent)}.band-selected-label{display:flex;align-items:center;gap:.5rem;font-size:.75rem;color:var(--text-dim);font-family:JetBrains Mono,Fira Code,monospace}.color-swatch{display:inline-block;width:12px;height:12px;border-radius:2px;border:1px solid rgba(0,0,0,.1);flex-shrink:0}.color-reference{display:flex;flex-direction:column;gap:.2rem}.color-ref-row{display:flex;align-items:center;gap:.5rem;font-size:.75rem}.color-ref-name{flex:1;color:var(--text-dim);font-family:JetBrains Mono,monospace}.color-ref-val{color:var(--text-dimmer);font-family:JetBrains Mono,monospace;font-size:.72rem;width:1.5rem;text-align:right}.preset-grid{display:flex;flex-direction:column;gap:.2rem}.preset-btn{background:var(--surface-deep);border:1px solid var(--border);border-radius:4px;color:var(--text-dimmer);font-size:.73rem;padding:.3rem .65rem;text-align:left;cursor:pointer;transition:border-color .15s,color .15s;font-family:JetBrains Mono,Fira Code,monospace}.preset-btn:hover{border-color:var(--accent);color:var(--accent)}.footer{border-top:1px solid var(--border);padding:1.25rem 1.5rem;color:var(--text-footer);font-size:.72rem;font-family:JetBrains Mono,Fira Code,monospace}.footer-inner{max-width:1100px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}.footer-links{display:flex;gap:1.25rem;flex-wrap:wrap}.footer-links a{color:var(--text-footer);text-decoration:none;transition:color .15s;font-family:JetBrains Mono,monospace}.footer-links a:hover{color:var(--accent)}.nav-hamburger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:4px}.nav-hamburger span{display:block;width:20px;height:1.5px;background:var(--text-dim);border-radius:2px}.nav-links--mobile{display:flex;flex-direction:column;padding:.75rem 1.5rem 1rem;border-top:1px solid var(--border);gap:.75rem;background:var(--mobile-nav-bg)}.nav-links--mobile a{color:var(--text-dim);font-size:.85rem;text-decoration:none;font-family:JetBrains Mono,monospace}.nav-links--mobile a.nav-active{color:var(--accent)}@media(max-width:820px){.nav-links--desktop{display:none}.nav-hamburger{display:flex}}@media(max-width:900px){.tools-grid{grid-template-columns:repeat(2,1fr)}}@media(max-width:700px){.grid-top{grid-template-columns:1fr}.edu-grid{grid-template-columns:1fr;gap:1rem}.hero h1{font-size:1.6rem}.tools-grid{grid-template-columns:1fr}}