:root{color-scheme:dark;--bg:#1b1e23;--surface:#252a30;--border:#373e46;--text:#edf2f6;--muted:#a6b1bc;--accent:#bfd6e6;--ink:#263642;font:16px Arial,Helvetica,sans-serif;color:var(--text);background:var(--bg)}
*{box-sizing:border-box}body{margin:0}p,h1,h2,h3{margin:0}button,input,select{font:inherit;min-height:44px}button,select,summary{cursor:pointer}a{color:inherit;text-underline-offset:4px}[hidden]{display:none!important}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--accent);outline-offset:3px}button:disabled,input:disabled,select:disabled{opacity:.45;cursor:default}.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}.skip-link{position:absolute;left:16px;top:-100px;z-index:5;background:var(--accent);color:var(--ink);padding:14px}.skip-link:focus{top:12px}
.site-header,main,footer{max-width:608px;margin:auto;padding-left:24px;padding-right:24px}.site-header{padding-top:24px;padding-bottom:24px}.brand{display:inline-flex;align-items:center;gap:10px;min-height:44px;font-size:18px;text-decoration:none}.brand span{color:var(--accent);font-size:25px}h1{font-size:14px;font-weight:500;letter-spacing:1.3px;text-transform:uppercase;line-height:1.5;color:var(--muted);margin:0 0 20px}.calculator{min-width:0}.modes{display:grid;grid-template-columns:1fr 1.1fr 1fr;gap:3px;padding:4px;border-radius:12px;background:var(--surface);margin-bottom:18px}.modes button{border:0;border-radius:9px;color:var(--muted);background:transparent;padding:10px 4px;font-size:12px;line-height:1.3}.modes button[aria-pressed=true]{background:var(--border);color:var(--text)}.time-field{background:var(--surface);border:1px solid var(--border);padding:17px 22px;border-radius:13px}.time-field label{display:block;color:var(--muted);font-size:12px}.time-row{display:flex;gap:12px;align-items:center;justify-content:space-between;margin-top:5px;min-width:0}.time-row input{color:var(--text);background:transparent;border:0;border-radius:5px;padding:0;min-width:0;width:230px;max-width:100%;font-size:40px;letter-spacing:-1px}.time-row>span{font-size:11px;color:var(--muted)}.time-row input::-webkit-calendar-picker-indicator{font-size:15px;cursor:pointer;padding:4px;opacity:.6}
.result{margin-top:18px;padding:25px 26px;background:var(--accent);color:var(--ink);border-radius:17px}#result-label{font-size:11px;letter-spacing:.8px;text-transform:uppercase}.result-hour{font-size:62px;letter-spacing:-2px;line-height:1.08;margin:12px 0 7px;font-variant-numeric:tabular-nums}.result-hour>span{font-size:16px;letter-spacing:0}.result-day{font-size:11px;line-height:1.5}.result-goal{font-size:14px;margin-top:16px}.result-bedtime{font-size:11px;line-height:1.5;margin-top:6px}.settings{border:1px solid var(--border);border-radius:13px;background:var(--surface);padding:0 18px;margin:18px 0 0;min-width:0}.setting{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:7px 0}.setting+.setting{border-top:1px solid var(--border)}.setting label{font-size:13px;line-height:1.4}.setting select{max-width:50%;width:155px;border:0;border-radius:4px;background:var(--surface);color:var(--accent);padding:5px 4px;font-size:13px;text-align:right}.reference{color:var(--muted);font-size:11px;line-height:1.6;margin-top:13px}.caution,.error,.guidance{font-size:13px;line-height:1.6;padding:16px;border:1px solid var(--border);border-radius:12px;margin-top:15px}.error,.caution{color:#f1d7b4}.guidance{background:var(--surface)}
.understand{border-top:1px solid var(--border);margin-top:40px;padding-top:27px;padding-bottom:20px}h2{font-size:18px;line-height:1.4;font-weight:500;margin-bottom:15px}details{border-bottom:1px solid var(--border)}summary{padding:17px 20px 17px 0;min-height:48px;line-height:1.5;font-size:13px;color:var(--text)}summary h3{display:inline;font:inherit}summary::marker{color:var(--muted)}.detail-copy{font-size:13px;color:var(--muted);line-height:1.8;padding:0 0 18px}.detail-copy p+p{margin-top:12px}.detail-copy strong{color:var(--text);font-weight:500}.detail-copy ul{padding-left:20px}.detail-copy a{color:var(--accent)}footer{padding-top:15px;padding-bottom:30px;color:var(--muted);font-size:10px;line-height:1.8}footer span{display:block;margin-top:3px}
.cycle-alternatives{margin-top:19px}.cycles-label{font-size:12px;line-height:1.5;margin-bottom:10px}.cycle-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.cycle-card{padding:16px;background:var(--surface);border:1px solid var(--border);border-radius:12px;min-width:0}.cycle-card:only-child{grid-column:1/-1}.cycle-time{display:block;font-size:29px;letter-spacing:-.8px;font-variant-numeric:tabular-nums}.cycle-day{font-size:10px;color:var(--muted);margin-top:4px}.cycle-duration{font-size:12px;line-height:1.5;margin-top:12px}.cycle-count{font-size:11px;color:var(--accent);line-height:1.5;margin-top:5px}.cycle-same{font-size:10px;color:var(--muted);margin-top:8px}.cycles-note{color:var(--muted);font-size:10px;line-height:1.6;margin-top:10px}
@media(max-width:360px){.site-header,main,footer{padding-left:16px;padding-right:16px}.site-header{padding-top:12px;padding-bottom:17px}.time-field{padding:16px}.time-row{gap:6px}.time-row input{font-size:34px;width:190px}.result{padding:22px}.result-hour{font-size:56px}.settings{padding:0 12px}.setting{gap:6px}.setting label{font-size:12px}.setting select{font-size:12px;width:130px}.modes button{font-size:11px}}