:root{color-scheme:dark;--bg:#101518;--panel:#191f23;--panel2:#20282d;--ink:#f4f6f3;--muted:#a5b1b7;--line:#343e44;--accent:#d3f86b;--accentink:#17200b;--danger:#ffb8a6;--shadow:0 20px 65px #0002;font-family:Inter,Arial,Helvetica,sans-serif;font-size:18px}
:root[data-theme=light]{color-scheme:light;--bg:#f4f5ef;--panel:#fff;--panel2:#eef0e8;--ink:#192326;--muted:#56636a;--line:#ccd2c8;--accent:#c3ed50;--accentink:#17200b;--danger:#9b301a;--shadow:0 20px 65px #2930160a}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);line-height:1.6}button,input,textarea{font:inherit}a{color:inherit;text-underline-offset:4px}button,a,input,summary,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.4}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,textarea:focus-visible{outline:3px solid var(--accent);outline-offset:4px}button,input,textarea{border:1px solid var(--line);border-radius:9px;color:var(--ink);background:var(--panel2)}button{min-height:48px;padding:9px 20px;font-weight:600}button:hover:not(:disabled){filter:brightness(1.12)}input,textarea{padding:11px 13px;max-width:100%;min-width:0}input::placeholder{color:var(--muted)}input[type=checkbox]{accent-color:#a9d94d;width:18px;height:18px}button.primary{background:var(--accent);color:var(--accentink);border-color:var(--accent)}.ghost{background:transparent}.danger{color:var(--danger)}[hidden]{display:none!important}.skip{position:fixed;left:16px;top:-100px;z-index:10;background:var(--accent);color:var(--accentink);padding:10px}.skip:focus{top:10px}.shell{max-width:1160px;margin:auto;padding:0 32px}.site-header{border-bottom:1px solid var(--line)}.header-row{min-height:88px;display:flex;gap:32px;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:11px;text-decoration:none;font-size:18px;font-weight:750;white-space:nowrap}.brand-icon{display:grid;place-items:center;border:2px solid var(--accent);border-radius:50%;width:30px;height:30px;color:var(--accent);font-size:21px;line-height:1}.nav{display:flex;gap:26px;align-items:center}.nav a{font-size:14px;text-decoration:none;color:var(--muted);padding:29px 0;border-bottom:2px solid transparent}.nav a[aria-current=page]{color:var(--ink);border-color:var(--accent)}#theme{font-size:14px;min-height:38px;padding:5px 13px}.intro{padding:42px 0 25px}.eyebrow{font-size:11px;text-transform:uppercase;letter-spacing:2.2px;color:var(--accent);font-weight:700;display:flex;align-items:center;gap:9px}.eyebrow:before{content:'';width:6px;height:6px;background:var(--accent);border-radius:50%}h1{font-size:36px;letter-spacing:-1.2px;line-height:1.2;margin:12px 0}h2{font-size:22px;letter-spacing:-.5px;line-height:1.3;margin:0}h3{font-size:18px;margin:0 0 8px}p{margin:8px 0 18px}.intro p{color:var(--muted);font-size:16px}.instrument{border:1px solid var(--line);background:var(--panel);border-radius:16px;box-shadow:var(--shadow);overflow:hidden}.instrument-top{display:flex;align-items:center;justify-content:space-between;padding:18px 25px;font-size:12px}.state{font-size:11px;letter-spacing:1.5px;font-weight:700;display:flex;align-items:center;gap:8px}.state:before{content:'';width:6px;height:6px;background:var(--muted);border-radius:50%}.running .state:before{background:var(--accent)}.state-right{color:var(--muted);font-size:12px}.display-area{text-align:center;padding:20px 20px 28px}.display{font-family:'Arial',sans-serif;font-variant-numeric:tabular-nums;font-weight:600;font-size:clamp(56px,10.5vw,132px);letter-spacing:-5px;line-height:1.15;white-space:nowrap;font-feature-settings:'tnum';margin:14px 0 15px}.display.long{font-size:clamp(34px,8.2vw,96px);letter-spacing:-2px}.display .fraction{color:var(--muted);font-size:.68em;letter-spacing:-2px}.unfinished{color:var(--muted);font-size:13px;min-height:22px;font-variant-numeric:tabular-nums}.unfinished strong{color:var(--ink);font-weight:500;margin-left:8px}.controls{display:flex;justify-content:center;gap:12px;margin:23px auto 14px;max-width:620px}.controls button{height:62px;min-width:115px}.controls #toggle{flex:1.4;font-size:18px}.controls #lap{flex:1;font-size:18px}.controls #reset{background:transparent;border-color:transparent;min-width:90px;color:var(--muted)}.shortcuts{font-size:11px;color:var(--muted);word-spacing:2px}kbd{font-family:inherit;border:1px solid var(--line);padding:1px 5px;border-radius:4px;font-size:10px;margin:0 3px}.instrument-bottom{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:13px 24px;border-top:1px solid var(--line);font-size:12px}.instrument-bottom label{display:flex;align-items:center;gap:7px}.instrument-bottom button{font-size:12px;padding:5px 10px;min-height:35px;background:transparent}.options{display:flex;gap:20px;align-items:center;flex-wrap:wrap}.notice{font-size:14px;padding:12px 16px;border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:6px;background:var(--panel2);margin:15px 0}.section{margin-top:30px}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:17px}.section-heading span,.tag{font-size:12px;color:var(--muted)}.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px}table{border-collapse:collapse;width:100%;text-align:left;font-variant-numeric:tabular-nums;font-size:15px}th{background:var(--panel2);font-size:11px;letter-spacing:1px;text-transform:uppercase;font-weight:500;color:var(--muted);padding:13px 20px}td{padding:12px 20px;border-top:1px solid var(--line);background:var(--panel)}td input{width:100%;min-width:100px;padding:5px 9px;background:transparent;border-color:transparent;font-size:13px}td input:hover,td input:focus{border-color:var(--line)}td:first-child{width:16%;color:var(--muted)}td:last-child{width:34%}.badge{display:inline-block;font-size:9px;text-transform:uppercase;letter-spacing:.6px;padding:2px 6px;border-radius:4px;margin-left:9px;border:1px solid var(--line)}.fast .badge{color:var(--accent)}.slow .badge{color:var(--danger)}.empty{text-align:center;color:var(--muted);padding:26px;font-size:14px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:12px}.stat{padding:13px 19px;background:var(--panel);border:1px solid var(--line);border-radius:9px}.stat span{display:block;color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:1px}.stat strong{font-size:20px;font-variant-numeric:tabular-nums;font-weight:500}.result-panel{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:23px}.result-grid{display:flex;align-items:end;gap:12px;flex-wrap:wrap}.field{flex:1;min-width:220px}.field label{display:block;font-size:12px;color:var(--muted);margin-bottom:7px}.field input{width:100%}.result-grid button{font-size:13px;min-height:49px}.local-note{font-size:12px;color:var(--muted);margin:13px 0 0}.history{margin-top:18px;border-top:1px solid var(--line);padding-top:16px}.history summary{cursor:pointer;font-size:14px}.history-list{display:grid;gap:8px;margin:12px 0}.history-item{display:flex;gap:12px;align-items:center;flex-wrap:wrap;background:var(--panel2);padding:12px;border-radius:8px}.history-item p{flex:1;margin:0;font-size:14px;overflow-wrap:anywhere}.history-item small{display:block;color:var(--muted)}.history-item button{font-size:12px;min-height:36px;padding:5px 10px}.guide{margin:54px 0;display:grid;grid-template-columns:1.1fr 1fr;gap:70px;border-top:1px solid var(--line);padding-top:32px}.guide p,.guide li{color:var(--muted);font-size:15px}.guide h2{margin-bottom:22px}.steps{list-style:none;padding:0;counter-reset:step}.steps li{padding-left:38px;position:relative;margin:20px 0}.steps li:before{counter-increment:step;content:'0' counter(step);position:absolute;left:0;color:var(--accent);font-size:11px;font-weight:700;top:4px}.steps strong{display:block;color:var(--ink);font-size:15px}.faq details{padding:13px 0;border-bottom:1px solid var(--line);font-size:14px}.faq summary{cursor:pointer;font-weight:600}.faq p{margin-top:12px;font-size:14px}.site-footer{border-top:1px solid var(--line);padding:24px 0 32px;color:var(--muted);font-size:11px}.footer-row{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}.footer-links{display:flex;gap:20px}.site-footer p{margin-top:14px}.prose{max-width:740px;min-height:65vh;padding:50px 0}.prose h2{margin:30px 0 12px}.prose p{color:var(--muted)}dialog{max-width:min(520px,calc(100vw - 32px));color:var(--ink);background:var(--panel);border:1px solid var(--line);border-radius:15px;padding:28px;box-shadow:var(--shadow)}dialog::backdrop{background:#000a}dialog h2{margin-bottom:13px}dialog p{font-size:15px;color:var(--muted)}.dialog-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}.dialog-actions button{font-size:14px}textarea{width:100%;height:210px;font-size:14px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.mode-fullscreen .display,.mode-classroom .display{font-size:clamp(64px,12vw,154px)}.mode-fullscreen .display.long,.mode-classroom .display.long{font-size:clamp(34px,8vw,100px)}.mode-lap #lap{flex:1.6;background:var(--accent);color:var(--accentink)}.mode-lap #toggle{background:var(--panel2);color:var(--ink);border-color:var(--line)}.activity{text-align:center;color:var(--accent);font-size:20px;overflow-wrap:anywhere}.instrument:fullscreen,.instrument.window-fullscreen{background:var(--bg);width:100%;height:100%;border:0;border-radius:0;display:flex;flex-direction:column;justify-content:center;overflow:auto}.instrument.window-fullscreen{position:fixed;inset:0;z-index:50}.instrument:fullscreen .display,.instrument.window-fullscreen .display{font-size:clamp(58px,17vw,240px)}.instrument:fullscreen .display.long,.instrument.window-fullscreen .display.long{font-size:clamp(34px,12vw,170px)}.instrument:fullscreen .instrument-top,.instrument.window-fullscreen .instrument-top{position:absolute;top:0;left:0;right:0}.instrument:fullscreen .instrument-bottom,.instrument.window-fullscreen .instrument-bottom{margin-top:25px}.instrument:fullscreen .controls,.instrument.window-fullscreen .controls{width:min(90%,620px)}
@media(max-width:800px){.shell{padding:0 22px}.header-row{gap:15px;flex-wrap:wrap;padding-top:18px}.nav{order:3;width:100%;justify-content:space-between;gap:12px}.nav a{padding:10px 0 14px;font-size:12px}.guide{gap:30px}.display{letter-spacing:-3px}.intro{padding-top:30px}}
@media(max-width:540px){.shell{padding:0 16px}.brand{font-size:16px}h1{font-size:29px}.intro p{font-size:14px;max-width:310px}.eyebrow{font-size:10px}.instrument-top{padding:14px 15px}.state-right{font-size:10px}.display-area{padding:16px 12px 20px}.display{font-size:clamp(52px,15vw,80px);letter-spacing:-2px}.display .fraction{letter-spacing:-1px}.controls{gap:8px;flex-wrap:wrap;margin-top:22px}.controls button{min-width:0;height:58px;padding:10px}.controls #reset{min-width:58px;font-size:13px}.shortcuts{display:none}.instrument-bottom{padding:12px;align-items:flex-start;gap:8px}.options{gap:8px;flex-direction:column;align-items:flex-start}.instrument-bottom label{font-size:11px}.instrument-bottom button{font-size:11px;white-space:nowrap}.guide{grid-template-columns:1fr;gap:26px;margin:35px 0}.section{margin-top:24px}.section-heading h2{font-size:19px}.result-panel{padding:17px}.result-grid{gap:9px}.field{flex-basis:100%;min-width:0}.result-grid button{flex:1;padding:8px;white-space:nowrap;font-size:11px}.stats{gap:6px}.stat{padding:10px}.stat span{font-size:9px}.stat strong{font-size:15px}th{padding:10px 8px;font-size:9px}td{padding:10px 8px;font-size:12px}td input{font-size:11px;min-width:65px;padding:5px 0}.badge{margin-left:0;display:block;width:max-content;font-size:8px;padding:0 3px}td:first-child{width:13%}td:last-child{width:28%}.footer-row{gap:10px}.mode-fullscreen .display,.mode-classroom .display{font-size:17vw}.mode-fullscreen .display.long,.mode-classroom .display.long{font-size:10vw}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
:root{--accent-text:#d3f86b;--focus:#d3f86b}:root[data-theme=light]{--accent-text:#46650c;--focus:#46650c}
.eyebrow,.activity,.fast .badge,.steps li:before{color:var(--accent-text)}.brand-icon{color:var(--accent-text);border-color:var(--accent-text)}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,textarea:focus-visible{outline-color:var(--focus)}.controls button{white-space:nowrap}.guide p,.guide li{font-size:17px}.faq p{font-size:16px}#wake-status,#fullscreen-note{display:block;font-size:10px;color:var(--muted);line-height:1.4;margin-left:4px;max-width:180px}.result-grid .field input{font-size:16px}
@media(max-width:540px){.controls #toggle,.controls #lap{font-size:16px}.guide p,.guide li{font-size:16px}.result-grid button{flex:1 1 auto}.result-grid #save{flex-basis:100%}}