/* NENGO — Japanese Era Converter | washi-and-vermillion design system */
:root{
  --paper:#F7F2E8;
  --paper-deep:#EFE8D8;
  --card:#FFFDF8;
  --line:#E3DAC6;
  --line-strong:#CFC3A8;
  --ink:#262119;
  --ink-soft:#5A5346;
  --mute:#6E6555;
  --shu:#B7362C;
  --shu-deep:#93271F;
  --indigo:#35567F;
  --shadow-card:0 1px 2px rgba(38,33,25,.05),0 4px 14px rgba(38,33,25,.07),0 12px 34px rgba(38,33,25,.05);
  --shadow-pop:0 1px 2px rgba(38,33,25,.07),0 8px 24px rgba(38,33,25,.12);
}
*{margin:0;padding:0;box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  background:var(--paper);
  color:var(--ink);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3{font-family:'Fraunces',Georgia,serif;text-wrap:balance;line-height:1.25;}
p{text-wrap:pretty;}
.jp{font-family:'Noto Serif JP','Yu Mincho',serif;}
.num,.era-year,.west-year,td.num{font-variant-numeric:tabular-nums;}
a{color:var(--indigo);text-decoration:none;}
a:hover{text-decoration:underline;}
:focus-visible{outline:2px solid var(--shu);outline-offset:2px;border-radius:2px;}

/* ---------- header / nav ---------- */
header.site{
  background:var(--card);
  border-bottom:1px solid var(--line);
  padding:14px 20px;
  display:flex;align-items:center;justify-content:center;gap:14px;
}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;}
.brand:hover{text-decoration:none;}
.brand-seal{
  width:40px;height:40px;flex:0 0 40px;
  background:var(--shu);color:#FFF8EE;border-radius:8px;
  display:flex;align-items:center;justify-content:center;
  font-family:'Noto Serif JP',serif;font-weight:700;font-size:19px;line-height:1;
  letter-spacing:1px;
  box-shadow:inset 0 0 0 1.5px rgba(255,248,238,.35),0 2px 6px rgba(147,39,31,.28);
}
.brand-name{font-family:'Fraunces',serif;font-weight:600;font-size:18px;color:var(--ink);letter-spacing:.4px;}
.brand-sub{font-size:11px;color:var(--mute);letter-spacing:2.4px;text-transform:uppercase;display:block;margin-top:-2px;}
nav.site{
  background:var(--paper-deep);
  border-bottom:1px solid var(--line);
  padding:9px 16px;text-align:center;
  font-size:13px;letter-spacing:1.2px;
}
nav.site a{color:var(--ink-soft);margin:0 11px;text-transform:uppercase;font-size:12px;}
nav.site a:hover{color:var(--shu);text-decoration:none;}
nav.site a[aria-current="page"]{color:var(--shu);border-bottom:2px solid var(--shu);padding-bottom:2px;}

/* ---------- layout ---------- */
.container{max-width:860px;margin:0 auto;padding:36px 20px 80px;}
.container-narrow{max-width:720px;margin:0 auto;padding:36px 20px 80px;}
.today-badge{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--card);border:1px solid var(--line);border-radius:999px;
  padding:6px 16px;font-size:13.5px;color:var(--ink-soft);
  box-shadow:0 1px 3px rgba(38,33,25,.06);
  min-height:33px;
}
.today-badge .dot{width:7px;height:7px;border-radius:50%;background:var(--shu);flex:0 0 7px;}
.hero{text-align:center;margin-bottom:34px;}
.hero h1{font-size:clamp(28px,5.2vw,42px);font-weight:600;margin:14px 0 10px;}
.hero .lede{font-size:16.5px;color:var(--ink-soft);max-width:600px;margin:0 auto;}

/* ---------- cards ---------- */
.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:14px;
  box-shadow:var(--shadow-card);
  padding:26px 26px 28px;
  margin-bottom:26px;
}
.card h2{font-size:21px;margin-bottom:6px;}
.card .hint{font-size:13.5px;color:var(--mute);margin-bottom:16px;}

/* ---------- converter ---------- */
.conv-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;}
@media(max-width:680px){.conv-grid{grid-template-columns:1fr;}}
.field label{display:block;font-size:12.5px;letter-spacing:1.4px;text-transform:uppercase;color:var(--mute);margin-bottom:7px;font-weight:600;}
input[type="number"],input[type="date"],select{
  width:100%;
  font:inherit;font-size:17px;
  font-variant-numeric:tabular-nums;
  padding:11px 13px;
  border:1px solid var(--line-strong);
  border-radius:9px;
  background:#FFFEFB;color:var(--ink);
  transition:border-color .15s,box-shadow .15s;
}
input:focus,select:focus{border-color:var(--shu);box-shadow:0 0 0 3px rgba(183,54,44,.13);outline:none;}
.field-row{display:flex;gap:10px;}
.field-row>*{flex:1;}
.result{
  margin-top:16px;
  min-height:118px;                 /* CLS guard: reserve space before results render */
  border:1px dashed var(--line-strong);
  border-radius:10px;
  background:var(--paper);
  padding:16px 18px;
  transition:border-color .2s,background .2s;
}
.result.filled{border-style:solid;border-color:var(--line);background:#FFFEFB;}
.result .era-kanji{font-family:'Noto Serif JP',serif;font-size:34px;font-weight:700;color:var(--shu-deep);line-height:1.2;}
.result .era-kanji.latin{font-family:'Fraunces',Georgia,serif;font-weight:600;}
.result .era-main{font-size:19px;font-weight:600;}
.result .meta{font-size:14px;color:var(--ink-soft);margin-top:6px;}
.result .note{font-size:13px;color:var(--mute);margin-top:8px;border-top:1px solid var(--line);padding-top:8px;}
.result .error{color:var(--shu-deep);font-size:15px;}
.dual{display:grid;gap:12px;}
.dual .half{border-left:3px solid var(--line-strong);padding-left:12px;}
.dual .half.active{border-left-color:var(--shu);}

/* ---------- tables ---------- */
.table-wrap{overflow-x:auto;}
table{width:100%;border-collapse:collapse;font-size:15px;}
th{
  text-align:left;font-size:12px;letter-spacing:1.4px;text-transform:uppercase;
  color:var(--mute);font-weight:600;
  border-bottom:2px solid var(--line-strong);
  padding:8px 12px;
}
td{border-bottom:1px solid var(--line);padding:9px 12px;vertical-align:top;}
tr:last-child td{border-bottom:none;}
td .jp{font-size:17px;font-weight:700;}
tr:hover td{background:rgba(183,54,44,.03);}

/* ---------- FAQ ---------- */
.faq details{
  border:1px solid var(--line);border-radius:10px;background:var(--card);
  margin-bottom:10px;overflow:hidden;
}
.faq summary{
  cursor:pointer;padding:14px 18px;font-weight:600;font-size:15.5px;
  list-style:none;position:relative;padding-right:40px;
}
.faq summary::-webkit-details-marker{display:none;}
.faq summary::after{
  content:"+";position:absolute;right:16px;top:50%;transform:translateY(-50%);
  font-size:20px;color:var(--shu);font-weight:400;transition:transform .18s;
}
.faq details[open] summary::after{transform:translateY(-50%) rotate(45deg);}
.faq .faq-body{padding:0 18px 15px;font-size:15px;color:var(--ink-soft);}

/* ---------- year pages ---------- */
.year-hero{text-align:center;padding:8px 0 4px;}
.year-hero .eq{
  display:flex;align-items:center;justify-content:center;gap:18px;flex-wrap:wrap;
  margin:18px 0 6px;
}
.year-hero .big{font-family:'Fraunces',serif;font-size:clamp(34px,7vw,54px);font-weight:600;}
.year-hero .big.jp{font-family:'Noto Serif JP',serif;color:var(--shu-deep);}
.year-hero .eqsign{font-size:30px;color:var(--mute);font-family:'Fraunces',serif;}
.fact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:14px;margin:22px 0;}
.fact{
  background:var(--card);border:1px solid var(--line);border-radius:11px;
  padding:15px 17px;box-shadow:0 1px 3px rgba(38,33,25,.05);
}
.fact .k{font-size:11.5px;letter-spacing:1.6px;text-transform:uppercase;color:var(--mute);font-weight:600;margin-bottom:5px;}
.fact .v{font-size:17px;font-weight:600;}
.fact .v .jp{font-size:19px;}
.fact .s{font-size:13px;color:var(--mute);margin-top:3px;}
.prevnext{display:flex;justify-content:space-between;gap:12px;margin:26px 0 6px;}
.prevnext a{
  flex:1;background:var(--card);border:1px solid var(--line);border-radius:10px;
  padding:12px 16px;font-size:14px;color:var(--ink-soft);
  transition:border-color .15s,box-shadow .15s;
}
.prevnext a:hover{text-decoration:none;border-color:var(--shu);box-shadow:var(--shadow-pop);color:var(--ink);}
.prevnext .next{text-align:right;}
.crumb{font-size:13px;color:var(--mute);margin-bottom:14px;}
.crumb a{color:var(--mute);}
.crumb a:hover{color:var(--shu);}

/* ---------- cookie banner ---------- */
#cookie-banner{
  position:fixed;left:16px;right:16px;bottom:16px;z-index:60;
  max-width:520px;margin:0 auto;
  background:var(--ink);color:#F3EFE6;
  border-radius:12px;padding:16px 18px;
  font-size:13.5px;line-height:1.6;
  box-shadow:0 6px 30px rgba(0,0,0,.25);
  display:none;
}
#cookie-banner.show{display:block;}
#cookie-banner a{color:#E8B9A2;}
#cookie-banner .cb-actions{margin-top:10px;display:flex;gap:10px;}
#cookie-banner button{
  font:inherit;font-size:13px;font-weight:600;
  padding:7px 16px;border-radius:8px;border:1px solid transparent;cursor:pointer;
}
#cookie-banner .cb-ok{background:var(--shu);color:#FFF8EE;}
#cookie-banner .cb-ok:hover{background:var(--shu-deep);}

/* ---------- footer ---------- */
footer.site{
  background:var(--paper-deep);
  border-top:1px solid var(--line);
  padding:30px 20px 36px;
  text-align:center;
  font-size:13px;color:var(--mute);
}
footer.site .flinks{margin-bottom:12px;}
footer.site .flinks a{color:var(--ink-soft);margin:0 10px;font-size:12.5px;letter-spacing:1px;text-transform:uppercase;}
footer.site .flinks a:hover{color:var(--shu);}
footer.site .fnote{font-size:12px;color:var(--mute);}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{transition:none!important;animation:none!important;}
}