/* OvaCalc — one stylesheet. Palette: warm neutral ground, garnet for period days,
   deep teal-green for the fertile window. Those two colours carry all the meaning. */

:root{
  /* Flo's model, measured off their live page: white ground, near-black text,
     pink kept for the brand and for the three states that carry meaning. */
  --paper:#FFFFFF;
  --panel:#F7F7F8;
  --panel-2:#EDEDF0;
  --ink:#16161A;
  --ink-2:#3F3F47;
  --muted:#66666E;
  --rule:#E7E7EA;
  --rule-2:#D4D4DA;

  --brand:#FF5A7D;        /* logo only: white on it is exactly 3.0 */
  --blood-soft:#FFE9EE;   /* period fill    */
  --blood:#B03052;        /* period number  */
  --blood-line:#FFD2DE;
  --fer-fill:#FFC3D2;     /* fertile fill   */
  --fer-ink:#95143C;      /* fertile number */
  --go:#DE1B4E;           /* ovulation fill, solid buttons */
  --go-deep:#C41B47;      /* pink text on white            */
  --go-soft:#FFF1F4;
  --go-line:#FFD2DE;
  --on-go:#FFFFFF;

  --focus:#C41B47;
  --radius:12px;
  --shadow:0 1px 3px rgba(22,22,26,.06);
}
@media (prefers-color-scheme:dark){
  :root:not([data-t="light"]){
    --paper:#141416; --panel:#1D1D20; --panel-2:#26262A;
    --ink:#F4F4F6; --ink-2:#C9C9D0; --muted:#96969E;
    --rule:#2B2B30; --rule-2:#3C3C43;
    --brand:#FF7A96;
    --blood-soft:#3A1F27; --blood:#E8899F; --blood-line:#54303A;
    --fer-fill:#7A2743; --fer-ink:#FFD3DF;
    --go:#FF5A7D; --go-deep:#FF8FA8; --go-soft:#331C24; --go-line:#5A2E3C; --on-go:#1A0D12;
    --focus:#FF8FA8; --shadow:0 1px 3px rgba(0,0,0,.45);
  }
}
:root[data-t="dark"]{
  --paper:#141416; --panel:#1D1D20; --panel-2:#26262A;
  --ink:#F4F4F6; --ink-2:#C9C9D0; --muted:#96969E;
  --rule:#2B2B30; --rule-2:#3C3C43;
  --brand:#FF7A96;
  --blood-soft:#3A1F27; --blood:#E8899F; --blood-line:#54303A;
  --fer-fill:#7A2743; --fer-ink:#FFD3DF;
  --go:#FF5A7D; --go-deep:#FF8FA8; --go-soft:#331C24; --go-line:#5A2E3C; --on-go:#1A0D12;
  --focus:#FF8FA8; --shadow:0 1px 3px rgba(0,0,0,.45);
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font:400 17px/1.6 "Public Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  -webkit-font-smoothing:antialiased;
}
.w{max-width:680px;margin:0 auto;padding:0 20px}
.wide{max-width:820px}

/* ---------- header + nav ---------- */
header{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  max-width:820px;margin:0 auto;padding:16px 20px 10px;
}
.brand{
  font-weight:800;font-size:17px;letter-spacing:-.02em;color:var(--ink);
  text-decoration:none;display:inline-flex;align-items:center;gap:7px;
}
.brand svg{display:block}
#themer{
  color:var(--muted);text-decoration:none;font-size:19px;line-height:1;
  padding:5px 7px;border-radius:6px;
}
#themer:hover{background:var(--panel);color:var(--ink)}
nav{max-width:820px;margin:0 auto 6px;padding:0 20px}
.ng{display:flex;flex-wrap:wrap;gap:6px 14px;align-items:baseline;font-size:14px}
.gl{
  font-size:10.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  color:var(--muted);margin-right:2px;
}
.ng a{color:var(--ink-2);text-decoration:none;border-bottom:1px solid transparent;padding-bottom:1px}
.ng a:hover{border-bottom-color:var(--rule-2);color:var(--ink)}
.ng a[aria-current="page"]{color:var(--go);font-weight:600;border-bottom-color:var(--go-line)}

/* ---------- above the fold ---------- */
h1{
  font-size:clamp(27px,5.4vw,38px);font-weight:800;letter-spacing:-.028em;
  line-height:1.1;margin:16px 0 7px;text-wrap:balance;
}
.lede{font-size:17.5px;color:var(--ink-2);margin:0 0 18px;max-width:56ch;line-height:1.45}

/* the tool */
.tool{
  background:var(--panel);border:1px solid var(--rule);border-radius:var(--radius);
  padding:16px;margin-bottom:14px;
}
.fields{display:grid;gap:12px 10px;grid-template-columns:1fr 1fr}
.fields .f.full{grid-column:1/-1}
@media(min-width:560px){.fields{gap:14px;grid-template-columns:1.3fr 1fr 1fr}.fields .f.full{grid-column:auto}}
.f label{
  display:block;font-size:12px;font-weight:700;letter-spacing:.04em;
  text-transform:uppercase;color:var(--muted);margin-bottom:5px;
}
.f input,.f select{
  width:100%;font:500 16px/1.3 "Public Sans",sans-serif;color:var(--ink);
  background:var(--paper);border:1px solid var(--rule-2);border-radius:7px;
  padding:11px 12px;appearance:none;
}
.f input[type=date]{min-height:44px}
.f input:focus,.f select:focus{outline:2px solid var(--focus);outline-offset:1px;border-color:transparent}
.f .hint{font-size:12.5px;color:var(--muted);margin-top:4px;display:block}

.presets{display:flex;flex-wrap:wrap;gap:7px;margin-top:14px;align-items:center}
.presets .gl{margin-right:0}
.presets button{
  font:600 13px/1 "Public Sans",sans-serif;color:var(--ink-2);cursor:pointer;
  background:var(--paper);border:1px solid var(--rule-2);border-radius:99px;padding:7px 12px;
}
.presets button:hover{border-color:var(--go);color:var(--go)}
.presets button:focus-visible{outline:2px solid var(--focus);outline-offset:2px}

/* ---------- the answer ---------- */
.answer{
  border:1px solid var(--go-line);background:var(--go-soft);
  border-radius:var(--radius);padding:20px;margin-bottom:16px;
}
.answer .k{
  font-size:11px;font-weight:700;letter-spacing:.11em;text-transform:uppercase;
  color:var(--go-deep);margin-bottom:8px;
}
.answer .big{
  font-size:clamp(23px,4.6vw,30px);font-weight:800;letter-spacing:-.025em;
  line-height:1.18;color:var(--ink);margin:0 0 10px;text-wrap:balance;
}
.answer .sub{font-size:16px;color:var(--ink-2);margin:0;line-height:1.5}
.answer .sub b{color:var(--ink);font-weight:700}
.peakday{
  display:inline-block;background:var(--go);color:var(--on-go);font-weight:700;
  padding:1px 8px;border-radius:5px;white-space:nowrap;
}

.acts{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.acts a,.acts button{
  font:600 13.5px/1 "Public Sans",sans-serif;cursor:pointer;text-decoration:none;
  border-radius:99px;padding:11px 18px;border:1px solid var(--go-line);
  background:var(--paper);color:var(--go-deep);display:inline-flex;align-items:center;gap:6px;
}
.acts button:first-child{background:var(--go);color:var(--on-go);border-color:var(--go)}
.acts button:first-child:hover{background:var(--go-deep);border-color:var(--go-deep)}
.acts a:hover,.acts button:hover{background:var(--go);color:var(--on-go);border-color:var(--go)}
.acts a:focus-visible,.acts button:focus-visible{outline:2px solid var(--focus);outline-offset:2px}

/* ---------- day-by-day odds ---------- */
.odds{margin:0 0 16px}
.odds h2{font-size:17px;font-weight:700;letter-spacing:-.01em;margin:0 0 3px}
.odds .note{font-size:13.5px;color:var(--muted);margin:0 0 14px}
.orow{
  display:grid;grid-template-columns:82px 1fr 44px;align-items:center;gap:10px;
  padding:5px 0;
}
.orow .d{font:500 13.5px/1.25 "DM Mono",ui-monospace,monospace;color:var(--ink-2)}
.orow .bar{height:16px;background:var(--panel-2);border-radius:4px;overflow:hidden}
.orow .bar i{display:block;height:100%;background:var(--fer-fill);border-radius:4px}
.orow.top .bar i{background:var(--go)}
.orow.top .d{color:var(--ink);font-weight:600}
.orow .p{
  font:500 13.5px/1 "DM Mono",ui-monospace,monospace;text-align:right;
  color:var(--ink-2);font-variant-numeric:tabular-nums;
}
.orow.top .p{color:var(--go-deep);font-weight:600}

/* ---------- calendar ---------- */
.cal{margin:0 0 26px}
.cal h2{font-size:17px;font-weight:700;letter-spacing:-.01em;margin:0 0 12px}
.months{display:grid;gap:18px;grid-template-columns:1fr}
@media(min-width:600px){.months{grid-template-columns:1fr 1fr}}
.m{border:1px solid var(--rule);border-radius:var(--radius);padding:12px 12px 10px;background:var(--panel)}
.m .mn{font-size:13px;font-weight:700;letter-spacing:.02em;margin-bottom:9px;color:var(--ink)}
.grid{display:grid;grid-template-columns:repeat(7,1fr);gap:2px}
.grid .dow{
  font:700 10px/1 "Public Sans",sans-serif;color:var(--muted);text-align:center;
  padding:3px 0 5px;letter-spacing:.03em;
}
.grid .c{
  aspect-ratio:1;display:flex;align-items:center;justify-content:center;
  font:500 12.5px/1 "DM Mono",ui-monospace,monospace;border-radius:5px;
  color:var(--ink-2);font-variant-numeric:tabular-nums;
}
.grid .c.out{color:transparent}
.grid .c.per{background:var(--blood-soft);color:var(--blood);font-weight:600}
.grid .c.fer{background:var(--fer-fill);color:var(--fer-ink);font-weight:600}
.grid .c.ovu{background:var(--go);color:var(--on-go);font-weight:700}
.grid .c.today{outline:1.5px solid var(--rule-2);outline-offset:-1.5px}
.legend{display:flex;flex-wrap:wrap;gap:6px 16px;margin-top:14px;font-size:12.5px;color:var(--muted)}
.legend span{display:inline-flex;align-items:center;gap:6px}
.legend i{width:11px;height:11px;border-radius:3px;display:block}

/* ---------- prose below the fold ---------- */
main section{margin-top:38px}
h2.s{
  font-size:22px;font-weight:800;letter-spacing:-.02em;margin:0 0 10px;
  padding-top:16px;border-top:1px solid var(--rule);text-wrap:balance;
}
h3{font-size:17px;font-weight:700;letter-spacing:-.01em;margin:22px 0 6px}
p{margin:0 0 14px}
a{color:var(--go-deep);text-underline-offset:2px;text-decoration-thickness:1px}
ul,ol{margin:0 0 14px;padding-left:22px}
li{margin-bottom:6px}
strong{font-weight:700}
.small{font-size:14.5px;color:var(--muted)}

table{border-collapse:collapse;width:100%;font-size:15px;margin:0 0 14px}
th{
  text-align:left;font-size:11px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;
  color:var(--muted);padding:8px 10px;border-bottom:1px solid var(--rule-2);
}
td{padding:8px 10px;border-bottom:1px solid var(--rule)}
td.n{font:500 14px/1.3 "DM Mono",ui-monospace,monospace;font-variant-numeric:tabular-nums;text-align:right}
th.n{text-align:right}
.tw{overflow-x:auto;border:1px solid var(--rule);border-radius:var(--radius);padding:2px 10px;background:var(--panel)}

details{border-bottom:1px solid var(--rule);padding:2px 0}
summary{
  cursor:pointer;font-weight:700;font-size:16.5px;padding:12px 0;
  list-style:none;display:flex;justify-content:space-between;gap:14px;align-items:baseline;
}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--muted);font-weight:400;font-size:19px}
details[open] summary::after{content:"\2212"}
details p{margin:0 0 14px;color:var(--ink-2)}
summary:focus-visible{outline:2px solid var(--focus);outline-offset:2px;border-radius:4px}

.callout{
  background:var(--panel);border-left:3px solid var(--go);border-radius:0 7px 7px 0;
  padding:14px 16px;margin:0 0 16px;font-size:15.5px;
}
.callout p:last-child{margin-bottom:0}

footer{
  margin-top:52px;border-top:1px solid var(--rule);padding:18px 0 44px;
  font-size:13.5px;color:var(--muted);
}
footer .fl{display:flex;flex-wrap:wrap;gap:6px 18px;margin-bottom:10px}
footer a{color:var(--ink-2);text-decoration:none}
footer a:hover{color:var(--go);text-decoration:underline}

@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}

/* ---------- (ring removed: the calendar reads faster) ---------- */
.ringwrap{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:20px 40px;
  background:var(--panel);border:1px solid var(--rule);border-radius:var(--radius);
  padding:22px;margin:0 0 26px;
}
.ringwrap svg{display:block;flex:none;margin:0 auto}
.lifespan svg{max-width:100%}
.ringkey{width:230px;flex:none;display:flex;flex-direction:column;gap:12px}
.kr{display:grid;grid-template-columns:13px 1fr;gap:11px;align-items:start}
.kr i{width:13px;height:13px;border-radius:4px;display:block;margin-top:4px}
.kr b{display:block;font:700 14px/1.3 "Public Sans",sans-serif;color:var(--ink)}
.kr span{display:block;font-size:13px;line-height:1.4;color:var(--muted)}

/* ---------- three short cards instead of three prose subsections ---------- */
.cards{display:grid;gap:12px;grid-template-columns:1fr;margin:0 0 16px}
@media(min-width:620px){.cards{grid-template-columns:repeat(3,1fr)}}
.cd{
  background:var(--panel);border:1px solid var(--rule);border-radius:10px;
  padding:15px 16px 16px;
}
.cd svg{display:block;margin-bottom:9px}
.cd b{display:block;font:700 15px/1.25 "Public Sans",sans-serif;color:var(--ink);margin-bottom:5px}
.cd p{margin:0;font-size:14px;line-height:1.5;color:var(--ink-2)}

/* ---------- sperm vs egg: the diagram that replaces a paragraph ---------- */
.lifespan{
  background:var(--panel);border:1px solid var(--rule);border-radius:var(--radius);
  padding:18px 20px 16px;margin:0 0 16px;
}
.lifespan svg{display:block;width:100%;height:auto;max-width:520px;margin:0 auto}
.lifespan p{margin:12px 0 0;font-size:14px;color:var(--muted);line-height:1.5;text-align:center}