:root{--red:#bc204c;--ink:#2e2e30;--muted:#77777b;--border:#e3e3e5;--background:#f7f7f8;--range-fill:21.4286%}
*{box-sizing:border-box}
html{background:var(--background)}
body{margin:0;color:var(--ink);font-family:Arial,Helvetica,sans-serif;-webkit-text-size-adjust:100%;line-height:1.5}
button,input,select{font:inherit}
button,select,summary{cursor:pointer}
button{-webkit-tap-highlight-color:transparent}
button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:2px solid var(--red);outline-offset:5px}
.header{background:#fff;border-top:3px solid var(--red);border-bottom:1px solid var(--border)}
.header-inner{max-width:960px;margin:auto;display:flex;align-items:center;gap:16px;padding:16px}
.logo{display:block;width:112px;height:auto;flex-shrink:0}
.heading{border-left:1px solid #d9d9dd;padding-left:16px;min-width:0}
h1{font-size:16px;font-weight:700;line-height:1.3;margin:0 0 9px;white-space:nowrap}
.heading p{margin:0;color:#707074;font-size:14px;line-height:1.3}
main{padding:16px 12px 24px;max-width:960px;margin:auto}
.card{border:1px solid #e8e8eb;border-radius:20px;background:#fff;padding:14px;box-shadow:0 6px 32px #00000002}
.stage{position:relative;aspect-ratio:1;width:100%;background:#fff;overflow:hidden;margin:0 0 16px}
canvas{display:block;width:100%;height:100%}
.screen-hz{position:absolute;right:12px;top:10px;color:#818184;font-size:13px;pointer-events:none;letter-spacing:.02em}
.controls{border-top:1px solid #ededee;padding-top:22px}
.frequency-row{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:15px}
.readout{display:flex;align-items:center;gap:5px}
#number{width:88px;height:36px;border:1px solid #dcdce0;border-radius:7px;background:#fff;text-align:right;padding:6px 8px;color:#080808;appearance:textfield;font-size:17px}
#number::-webkit-inner-spin-button,#number::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}
#freq{-webkit-appearance:none;appearance:none;display:block;width:100%;margin:18px 0 7px;height:20px;background:transparent;cursor:pointer;touch-action:pan-y}
#freq::-webkit-slider-runnable-track{height:4px;border-radius:8px;background:linear-gradient(to right,var(--red) 0,var(--red) var(--range-fill),#e5e5e5 var(--range-fill),#e5e5e5 100%)}
#freq::-moz-range-track{height:4px;border-radius:8px;background:linear-gradient(to right,var(--red) 0,var(--red) var(--range-fill),#e5e5e5 var(--range-fill),#e5e5e5 100%)}
#freq::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:24px;height:17px;border:1px solid #ebebeb;border-radius:15px;background:#fff;box-shadow:0 0 3px #0002;margin-top:-6.5px}
#freq::-moz-range-thumb{width:24px;height:17px;border:1px solid #ebebeb;border-radius:15px;background:#fff;box-shadow:0 0 3px #0002}
.limits{display:flex;justify-content:space-between;gap:8px;color:var(--muted);font-size:12px;line-height:1.45;white-space:nowrap}
.actions{display:flex;justify-content:center;gap:10px;margin:24px 0 22px}
.circle{width:45px;height:45px;flex:0 0 45px;display:grid;place-items:center;border:2px solid #e6e6e6;border-radius:50%;background:#fff;color:var(--red);padding:11px}
.circle.primary,.circle[aria-pressed="true"]{background:var(--red);border-color:var(--red);color:#fff}
svg{display:block;width:100%;height:100%;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.hidden{display:none!important}
.options{display:flex;justify-content:space-between;align-items:center;gap:14px;font-size:15px}
.options label{display:flex;align-items:center;gap:12px}
select{height:36px;border:1px solid #dedee0;border-radius:8px;background:#fff;color:#0a0a0a;padding:5px 7px;max-width:100px}
.save{background:#fff;color:var(--red);border:1px solid #dedee1;border-radius:999px;padding:9px 15px;white-space:nowrap;font-size:14px;min-height:42px}
.instructions{font-size:18px;line-height:1.58;color:#727275;margin:29px 0 20px}
.info{border:1px solid #e2e2e5;border-radius:12px;overflow:hidden}
.info summary{list-style:none;display:flex;align-items:center;justify-content:space-between;color:var(--red);font-size:18px;font-weight:700;padding:14px 18px;min-height:60px}
.info summary::-webkit-details-marker{display:none}
.info summary svg{width:19px;height:19px}
.info[open] summary svg{transform:rotate(180deg)}
.info-content{padding:0 18px 12px;font-size:14px;line-height:1.6;color:var(--muted)}
.info-content p{margin:0 0 12px}
.exit-full{display:none}
.stage:fullscreen,.stage.expanded{position:fixed;inset:0;width:100%;height:100%;margin:0;aspect-ratio:auto;display:grid;place-items:center;z-index:20;background:#fff}
.stage:fullscreen canvas,.stage.expanded canvas{width:min(100vw,100dvh);height:min(100vw,100dvh)}
.stage:fullscreen .screen-hz,.stage.expanded .screen-hz{right:20px;top:20px}
.stage:fullscreen .exit-full,.stage.expanded .exit-full{display:block;position:absolute;right:20px;bottom:20px;width:44px;height:44px;border:1px solid var(--border);border-radius:50%;background:#fff;color:var(--red);font-size:28px;line-height:1}
body.expanded{overflow:hidden}
.toast{position:fixed;bottom:calc(20px + env(safe-area-inset-bottom));left:50%;transform:translateX(-50%);z-index:30;max-width:90vw;padding:10px 16px;border-radius:999px;background:var(--red);color:#fff;opacity:0;pointer-events:none;font-size:14px;text-align:center;transition:opacity .2s}
.toast.visible{opacity:1}
@media(min-width:700px){.header-inner{padding:24px 28px;gap:24px}.logo{width:145px}.heading{padding-left:24px}h1{font-size:22px}.heading p{font-size:17px}main{padding:24px 28px 40px}.card{padding:24px;max-width:740px;margin:auto;border-radius:22px}.stage{margin-bottom:24px}.screen-hz{font-size:16px}.frequency-row,.options{font-size:18px}#number{font-size:21px;height:43px;width:104px}.limits{font-size:14px}.circle{width:50px;height:50px;flex-basis:50px;padding:12px}.actions{gap:14px}.save{font-size:16px}.instructions{font-size:18px}.info summary{font-size:19px}}
@media(max-width:360px){.header-inner{gap:12px;padding:14px 12px}.logo{width:98px}.heading{padding-left:12px}h1{font-size:14px}.heading p{font-size:12px}main{padding:12px 9px 20px}.card{padding:12px}.limits{font-size:10px}.options{gap:8px;font-size:13px}.options label{gap:7px}.save{font-size:12px;padding:8px 10px}.instructions{font-size:16px}}
@media(prefers-reduced-motion:reduce){.toast{transition:none}}