:root{color-scheme:light;--bg:#f7f9f9;--surface:#fff;--ink:#182e32;--muted:#697c81;--line:#dfe7e8;--accent:#117968;--soft:#e9f5f0;--dark:#102f31;--shadow:0 8px 25px #1a454708}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.55 -apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.5}a,button,input{touch-action:manipulation}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{outline:3px solid #31ba9a;outline-offset:4px}header{height:78px;display:flex;align-items:center;gap:30px;justify-content:space-between;padding:0 4%;background:var(--surface);border-bottom:1px solid var(--line)}.brand{font-weight:800;letter-spacing:-1px;font-size:25px;display:flex;align-items:center}.brand-mark{background:var(--accent);color:#fff;width:34px;height:34px;display:grid;place-items:center;border-radius:10px;margin-right:10px;font-size:26px}.brand-dot{color:var(--accent)}nav{display:flex;gap:32px;font-size:14px;font-weight:600}nav a:hover{color:var(--accent)}#theme{border:1px solid var(--line);border-radius:8px;padding:7px 12px;background:var(--surface);color:var(--ink);font-size:13px}.shell{max-width:1540px;margin:auto;display:grid;grid-template-columns:225px minmax(0,1fr)}aside{padding:30px 18px;border-right:1px solid var(--line);min-height:calc(100vh - 78px)}aside a{display:flex;gap:12px;align-items:center;padding:11px 13px;margin-bottom:5px;border-radius:8px;font-size:14px;line-height:1.4}aside a.active{color:var(--accent);background:var(--soft);font-weight:700}aside a:hover{background:var(--soft)}aside>p{font-size:11px;letter-spacing:1.5px;color:var(--muted);margin:26px 13px 15px}.nav-icon{font-size:18px;width:20px;text-align:center;color:var(--muted)}.sidebar-note{margin:38px 13px;padding-top:22px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}.sidebar-note>span{color:var(--accent);margin-right:8px}.sidebar-note p{font-size:12px;line-height:1.9;margin-top:8px}main{padding:35px 40px 45px;min-width:0}h1,h2,h3,p{margin-top:0}h1{font-size:34px;line-height:1.15;letter-spacing:-1.2px;margin-bottom:12px}h2{font-size:20px;letter-spacing:-.4px;line-height:1.3}h3{font-size:16px;line-height:1.4}h1 em{font-style:normal;color:var(--accent)}.home-heading h1{font-size:43px;margin:8px 0 10px;letter-spacing:-1.7px}.eyebrow{font-size:11px;font-weight:750;letter-spacing:1.7px;color:var(--accent)}.home-heading p,.subtitle{color:var(--muted);margin-bottom:0}.search-box{margin:25px 0 13px;position:relative}.search-box input{width:100%;border:1px solid #c9d8d6;border-radius:12px;padding:19px 52px;background:var(--surface);color:var(--ink);box-shadow:var(--shadow);font-size:16px}.search-box>span{position:absolute;left:18px;top:11px;font-size:29px;color:var(--accent)}.search-box kbd{position:absolute;right:19px;top:18px;border:1px solid var(--line);border-radius:5px;padding:0 7px;color:var(--muted)}.quick-search{display:flex;gap:8px;align-items:center;flex-wrap:wrap;font-size:12px;color:var(--muted)}.quick-search button{font-size:12px;padding:4px 10px;border:1px solid var(--line);background:var(--surface);border-radius:25px;color:var(--muted)}.quick-search button:hover{color:var(--accent);border-color:var(--accent)}.section-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin:32px 0 17px}.section-head h2{margin:0;font-size:19px}.section-head>span{font-size:12px;color:var(--muted)}.tool-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:13px}.tool-card{padding:18px;position:relative;background:var(--surface);border:1px solid var(--line);border-radius:12px;min-height:155px;box-shadow:0 2px 4px #001e2202;transition:transform .18s,border-color .18s,box-shadow .18s}.tool-card:hover{transform:translateY(-3px);border-color:#83b7aa;box-shadow:var(--shadow)}.tool-icon{width:36px;height:36px;display:grid;place-items:center;font-size:22px;font-weight:600;border-radius:10px;background:#e7f4ef;color:#188569;margin-bottom:14px;flex-shrink:0}.tool-card h3{font-size:14px;margin:0 0 6px}.tool-card p{font-size:12px;color:var(--muted);line-height:1.6;margin:0}.tool-icon.student{background:#f1edff;color:#7960b8}.tool-icon.health{background:#ffeef0;color:#cc6676}.tool-icon.everyday{background:#fff2de;color:#aa7a24}.tool-icon.device-tests{background:#e7f1fd;color:#537fae}.tool-icon.networking{background:#eeedff;color:#7767b1}.tool-icon.developer{background:#eaf0f4;color:#527386;font-size:16px}.tool-icon.technology,.tool-icon.converters{background:#e9f4f8;color:#438d9e}.tool-icon.home-business{background:#fff0e6;color:#b88055}.card-arrow{position:absolute;right:15px;top:19px;color:#99aaa9;font-size:15px}.category-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px}.category-grid a{border:1px solid var(--line);border-radius:10px;padding:15px;background:var(--surface);display:flex;align-items:flex-start;flex-direction:column}.category-grid a:hover{border-color:var(--accent)}.category-grid .tool-icon{width:30px;height:30px;font-size:18px;margin-bottom:10px}.category-grid strong{font-size:13px;font-weight:600}.category-grid small{font-size:11px;color:var(--muted);margin-top:3px}.home-feature{margin-top:30px;background:var(--dark);color:#fff;padding:28px 34px;display:grid;grid-template-columns:1.4fr 1fr;align-items:center;border-radius:15px;overflow:hidden}.home-feature .eyebrow{color:#81d7bf}.home-feature h2{font-size:25px;letter-spacing:-.7px;margin:10px 0}.home-feature p{font-size:13px;color:#b2ccc9;max-width:370px;margin-bottom:18px}.home-feature small{display:block;font-size:11px;color:#98bbb4;margin-top:10px}.home-feature .action{background:#a8eed6;color:#154637}.mini-gauge svg{width:100%;max-height:170px;overflow:visible}.mini-track,.mini-ring{fill:none;stroke:#35595c;stroke-width:9;stroke-linecap:round}.mini-ring{stroke:#81e4c6}.mini-needle{stroke:#a8eed6;stroke-width:4;stroke-linecap:round}.mini-gauge circle{fill:#a8eed6}.mini-gauge text{fill:#b4d4cd;font-size:12px}.action{display:inline-flex;justify-content:center;align-items:center;gap:15px;background:var(--accent);color:#fff;border:0;border-radius:8px;padding:11px 18px;font-size:14px;font-weight:650}.action:hover{filter:brightness(1.08)}.action.secondary{border:1px solid var(--line);color:var(--ink);background:var(--surface)}.actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:22px}.crumb{font-size:13px;color:var(--muted);margin-bottom:26px}.crumb a:hover{color:var(--accent)}.tool-heading{display:flex;align-items:flex-start;gap:16px;margin-bottom:28px}.tool-heading .tool-icon{width:47px;height:47px;margin:0}.tool-heading h1{font-size:29px;margin-bottom:8px}.tool-heading .subtitle{font-size:14px}.calculator,.workbench-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:22px}.panel{background:var(--surface);border:1px solid var(--line);border-radius:13px;padding:25px;min-width:0}.panel-title{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:24px}.panel-title h2{margin:0;font-size:16px}.panel-title>span{font-size:11px;color:var(--muted)}.calc-fields{display:grid;grid-template-columns:1fr 1fr;gap:21px 16px}label{display:block;font-size:14px;color:var(--muted)}input:not([type=range]),select,textarea{width:100%;padding:11px 12px;border:1px solid var(--line);border-radius:7px;color:var(--ink);background:var(--surface);margin-top:8px;min-width:0}input[type=color]{height:50px;padding:5px}textarea{resize:vertical;font:14px/1.65 ui-monospace,SFMono-Regular,Consolas,monospace;min-height:160px}.wide{grid-column:1/-1}.range{width:100%;margin-top:12px;accent-color:var(--accent);height:5px;cursor:pointer}.result-panel{background:var(--soft);border-color:#c7dfd6}.result-panel .panel-title 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0}.error{color:#ba513f;font-size:14px}.pagination{display:flex;gap:15px;align-items:center;justify-content:center;margin-top:20px}.pagination:empty{display:none}.pagination button{border:1px solid var(--line);padding:8px 15px;border-radius:7px;background:var(--surface);color:var(--ink);font-size:13px}.pagination span{font-size:13px;color:var(--muted)}.empty{padding:35px;grid-column:1/-1;background:var(--surface);border:1px solid var(--line);border-radius:10px}.policy{max-width:780px}.policy h2{margin-top:28px}.policy p{color:var(--muted)}footer{display:flex;align-items:center;justify-content:space-between;gap:20px;border-top:1px solid var(--line);margin-top:38px;padding-top:23px;font-size:12px;color:var(--muted)}footer div{display:flex;gap:18px}pre{white-space:pre-wrap;overflow-wrap:anywhere;word-break:break-word;font:14px/1.7 ui-monospace,monospace;max-width:100%;margin-bottom:20px}#copy-status,#copy-result,#copy-status{font-size:12px}.color-preview{padding:28px;border:1px solid var(--line);border-radius:8px;font-size:22px}.donut,.progress-ring{width:148px;height:148px;background:conic-gradient(var(--accent) var(--share),#bbd6ce 0);border-radius:50%;padding:14px;margin:22px auto 15px;display:grid;place-items:center;transition:background .25s}.donut>span,.progress-ring>span{border-radius:50%;background:var(--soft);height:120px;width:120px;display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:26px;font-weight:750;overflow-wrap:anywhere;text-align:center}.donut small,.progress-ring small{font-size:12px;color:var(--muted);font-weight:400}.chart-legend{display:flex;justify-content:center;gap:20px;font-size:12px;flex-wrap:wrap}.chart-legend span{display:flex;gap:5px;flex-direction:column}.chart-legend 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strong{font-size:24px;font-weight:650;margin:5px 0}.speed-stats small{font-size:11px;color:#8babaf}.speed-buttons{display:flex;justify-content:center;gap:12px;margin-top:24px}.speed-test .action{background:#9aebd3;color:#163d32}.speed-test .secondary{background:#1b3b42;color:#d8efec;border-color:#466069}.speed-test #status{font-size:12px;line-height:1.65;color:#9fc0c0;margin:17px auto 0;max-width:520px;text-align:center;min-height:40px}.final-results{margin-top:22px;border:1px solid #36575c;background:#15363d;border-radius:10px;padding:20px}.final-results h2{font-size:18px;color:#c6f3e6}.final-results pre{font-size:13px;color:#b9d4d2}.final-results span{font-size:12px}.device-panel{margin-top:22px}video{width:100%;max-height:400px;background:#172b30;border-radius:10px}.device-status{margin-top:22px;padding:15px;border-radius:8px;background:var(--bg);font-size:14px;color:var(--muted);min-height:53px}.meter{height:15px;background:var(--line);border-radius:10px;overflow:hidden;margin:16px 0}.meter i{display:block;background:var(--accent);height:100%;width:0;transition:width .08s}.waveform{height:130px;display:flex;align-items:center;justify-content:center;gap:5px}.waveform i{width:7px;height:8px;background:var(--accent);border-radius:5px;max-height:120px;transition:height .08s}audio{width:100%;margin:15px 0}.stereo{display:flex;justify-content:center;gap:40px;margin:20px}.stereo div{width:90px;height:110px;border-radius:25px;border:3px solid var(--line);display:grid;place-items:center;font-weight:750;font-size:30px;color:var(--muted);transition:.2s}.stereo .playing{background:var(--soft);border-color:var(--accent);box-shadow:0 0 0 8px #13896d12;color:var(--accent)}.key-grid{display:flex;flex-wrap:wrap;gap:6px;margin:20px 0}.key-grid span{padding:8px 11px;background:var(--bg);border:1px solid var(--line);border-radius:5px;font-size:12px}.key-grid .pressed{background:var(--accent);color:white}.test-area{width:100%;min-height:180px;display:grid;place-items:center;padding:25px;border:2px dashed #91b9ae;border-radius:12px;background:var(--soft);color:var(--ink);font-size:17px;text-align:center;user-select:none}.test-area.waiting{background:#795049;border-color:#a07165;color:white}.test-area.ready{background:#147b5f;border-color:#71ccaa;color:white}.stats-line{font-size:13px;margin-top:15px;color:var(--muted)}.screen-surface{background:white;border:1px solid var(--line);height:280px;position:relative;display:grid;place-items:center;cursor:pointer}.screen-surface:fullscreen{width:100vw;height:100vh;border:0}.screen-surface span{color:#fff;background:#0009;padding:8px 12px;border-radius:5px;font-size:12px}.latency-bars{height:120px;display:flex;align-items:flex-end;gap:12px;border-bottom:1px solid var(--line);margin:20px}.latency-bars i{width:30px;background:var(--accent);border-radius:4px 4px 0 0}.refresh-track{height:60px;background:var(--soft);border-radius:10px;padding:20px;overflow:hidden;max-width:310px}.refresh-track i{display:block;width:20px;height:20px;background:var(--accent);border-radius:50%}.skip{position:absolute;top:-100px}.skip:focus{top:0;background:var(--surface);z-index:100;padding:10px}.result-change{animation:result-in .18s ease-out}[hidden]{display:none!important}@keyframes result-in{from{opacity:.55;transform:translateY(2px)}to{opacity:1;transform:translateY(0)}}@keyframes flow{0%,100%{opacity:.55}50%{opacity:1}}[data-theme=dark]{color-scheme:dark;--bg:#101c22;--surface:#17272f;--ink:#e4edef;--muted:#9ab0b8;--line:#30434c;--accent:#73d6b8;--soft:#1b3737;--dark:#0b272e;--shadow:0 8px 25px #0002}[data-theme=dark] .action:not(.secondary){background:#79dcc0;color:#153930}[data-theme=dark] .result-panel{border-color:#365952}[data-theme=dark] .tool-icon{filter:saturate(.8);background:#2a454b;color:#97d9ce}[data-theme=dark] .search-box input{border-color:#35535a}[data-theme=dark] .donut,[data-theme=dark] .progress-ring{background:conic-gradient(var(--accent) var(--share),#365657 0)}@media(min-width:1500px){main{padding:42px 55px}}@media(max-width:1150px){.shell{grid-template-columns:200px minmax(0,1fr)}main{padding:30px 25px}.tool-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.category-grid{grid-template-columns:repeat(5,minmax(0,1fr))}.category-grid a{padding:12px}.category-grid strong{font-size:12px}.calculator,.workbench-grid{gap:15px}.panel{padding:20px}.calc-fields{gap:16px 12px}.tool-heading h1{font-size:26px}}@media(max-width:850px){.shell{display:block}aside{min-height:0;display:flex;overflow-x:auto;border:0;border-bottom:1px solid var(--line);padding:9px 15px;gap:5px}aside a{white-space:nowrap;flex-shrink:0;margin:0;padding:7px 10px;font-size:12px}aside>p,aside .sidebar-note{display:none}.nav-icon{display:none}.home-heading h1{font-size:36px}main{padding:27px 24px}.tool-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.tool-card{padding:15px}.tool-card h3{font-size:13px}.tool-card p{font-size:12px}.category-grid{grid-template-columns:repeat(5,minmax(0,1fr))}.tool-heading h1{font-size:27px}.tool-heading .subtitle{font-size:14px}}@media(max-width:650px){header{height:68px;padding:0 17px;gap:15px}.brand{font-size:21px}.brand-mark{width:29px;height:29px;font-size:23px;margin-right:7px}nav{gap:14px;font-size:12px}nav a:last-child{display:none}#theme{font-size:11px;padding:6px 8px}main{padding:24px 17px}.home-heading h1{font-size:33px;letter-spacing:-1.2px}.home-heading p{font-size:14px}.eyebrow{font-size:10px}.search-box{margin-top:22px}.search-box input{padding:17px 42px;font-size:14px}.search-box>span{left:14px;top:8px}.search-box kbd{display:none}.quick-search{gap:6px}.quick-search button{font-size:11px;padding:4px 8px}.tool-grid,.related{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.tool-card{min-height:155px;padding:16px}.tool-card h3{font-size:14px}.tool-icon{width:32px;height:32px;font-size:20px;margin-bottom:12px}.category-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.category-grid a{display:grid;grid-template-columns:35px 1fr;column-gap:10px;padding:13px}.category-grid .tool-icon{grid-row:span 2;margin:0}.category-grid strong{font-size:13px}.category-grid small{font-size:11px}.section-head{margin-top:28px}.section-head h2{font-size:17px}.section-head>span{font-size:11px}.home-feature{grid-template-columns:1fr;padding:25px}.home-feature h2{font-size:24px}.mini-gauge{display:none}.calculator,.workbench-grid{grid-template-columns:1fr}.tool-heading .tool-icon{width:37px;height:37px}.tool-heading h1{font-size:24px;letter-spacing:-.7px}.tool-heading{gap:12px}.calc-fields{gap:18px 13px}label{font-size:13px}.result-value{font-size:33px}.panel-title>span{font-size:10px}.result-row strong{font-size:22px}footer{align-items:flex-start;flex-direction:column;font-size:11px;gap:10px}.speed-test{padding:21px 15px}.speed-top .pill{font-size:9px;letter-spacing:1px}.speed-gauge{max-width:300px}.speed-stats strong{font-size:21px}.speed-stats span{font-size:11px}.speed-buttons .action{font-size:13px}.speed-stats small{font-size:10px}.actions .action{font-size:13px}.work-note{font-size:12px}.screen-surface span{max-width:90%;text-align:center}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
.result-row .counter{font-size:inherit;color:inherit;line-height:inherit}

/* Calm palette: neutral surfaces and one muted teal accent. */
:root{--bg:#f7f8f8;--surface:#ffffff;--ink:#293b3c;--muted:#627273;--line:#e0e6e5;--accent:#376f66;--soft:#eff4f2;--dark:#293f40;--shadow:0 5px 18px #263d3a05}
.brand-mark{background:var(--accent)}
.tool-icon,.tool-icon.student,.tool-icon.health,.tool-icon.everyday,.tool-icon.device-tests,.tool-icon.networking,.tool-icon.developer,.tool-icon.technology,.tool-icon.converters,.tool-icon.home-business{background:#eef2f1;color:#526e69}
.tool-card{box-shadow:none}.tool-card:hover{transform:translateY(-1px);border-color:#afc1bc;box-shadow:0 4px 14px #263d3a04}
.category-grid a:hover{border-color:#afc1bc}.search-box input{border-color:#d6dfdc;box-shadow:none}
.result-panel{background:#f2f6f4;border-color:#dce6e1}
.home-feature{background:#edf2f0;color:var(--ink);border:1px solid var(--line)}
.home-feature .eyebrow{color:var(--accent)}.home-feature p{color:var(--muted)}.home-feature small{color:var(--muted)}
.home-feature .action{background:var(--accent);color:white}
.mini-track{stroke:#d2ddda}.mini-ring{stroke:#759b90}.mini-needle{stroke:#507c71}.mini-gauge circle{fill:#507c71}.mini-gauge text{fill:#627570}
.notice{border-left-color:#a5bcb3}.error{color:#994f44}
.donut,.progress-ring{background:conic-gradient(var(--accent) var(--share),#d7e3dd 0)}
.bmi-scale{background:linear-gradient(to right,#d3dedd 0 28.33%,#8ead9f 28.33% 50%,#acbeb5 50% 66.66%,#7e9289 66.66%)}
.network-bit{background:#526e69;color:white}.host-bit{background:#d5e2dd;color:#304e43}
.speed-test{background:#263a3e;border-color:#394d50;color:#edf2f1}
.pill{color:#c0d0ca}.phase-icon{color:#bbd0c6}.gauge-track{stroke:#4a5e61}
#gauge-progress{stroke:#a1c2b1;filter:drop-shadow(0 0 3px #a1c2b125)}
#needle{fill:#c3d7ce;filter:none}.gauge-ticks{stroke:#889b9a}.gauge-label{fill:#b4c1be}
.speed-digital small,.speed-digital p{color:#c0cec9}
.speed-stats{border-color:#4c6060}.speed-stats div+div{border-color:#4c6060}
.speed-stats span{color:#c7d4cf}.speed-stats small{color:#b8c7c1}
.speed-test .action{background:#c0d3c8;color:#283f36}.speed-test .secondary{background:#33494b;color:#edf2f1;border-color:#647975}
.speed-test #status{color:#c2cec9}.final-results{background:#304649;border-color:#536b67}.final-results h2{color:#e2eae6}.final-results pre{color:#d1ddd6}
.stereo .playing{box-shadow:0 0 0 5px #376f6608}.test-area{border-color:#b1c2b9}
[data-theme=dark]{--bg:#1b2529;--surface:#253034;--ink:#e3e9e7;--muted:#afbcba;--line:#3d4c4d;--accent:#acc8ba;--soft:#2c3c3a;--dark:#293d3e;--shadow:none}
[data-theme=dark] .tool-icon{filter:none;background:#344440;color:#b9c8c0}
[data-theme=dark] .action:not(.secondary){background:#b5cbbf;color:#273d33}
[data-theme=dark] .result-panel{background:#2b3a37;border-color:#43544c}
[data-theme=dark] .search-box input{border-color:#475751}
[data-theme=dark] .home-feature{background:#2a3834;border-color:#43524a}
[data-theme=dark] .home-feature .action{background:#b5cbbf;color:#273d33}
[data-theme=dark] .mini-track{stroke:#45584d}[data-theme=dark] .mini-ring{stroke:#90ab9b}
[data-theme=dark] .mini-needle{stroke:#b6cabc}[data-theme=dark] .mini-gauge circle{fill:#b6cabc}[data-theme=dark] .mini-gauge text{fill:#b2c0b5}
[data-theme=dark] .donut,[data-theme=dark] .progress-ring{background:conic-gradient(var(--accent) var(--share),#475b50 0)}
[data-theme=dark] .network-bit{background:#789383;color:#15291e}[data-theme=dark] .host-bit{background:#354c3f;color:#d5e2d8}
[data-theme=dark] .error{color:#e0b2a8}

/* Shared requestAnimationFrame rendering owns gauge motion; no independent CSS lag. */
#needle,#gauge-progress{transition:none!important}
.transfer-progress{max-width:440px;margin:8px auto 18px;color:#c2cec9;font-size:12px}
.transfer-progress label{font-size:12px;color:inherit;display:flex;justify-content:space-between;margin-bottom:7px}
.transfer-progress progress{display:block;width:100%;height:5px;border:0;border-radius:5px;overflow:hidden;accent-color:#a1c2b1;background:#4a5e61}
.transfer-progress progress::-webkit-progress-bar{background:#4a5e61}
.transfer-progress progress::-webkit-progress-value{background:#a1c2b1}
.transfer-progress progress::-moz-progress-bar{background:#a1c2b1}