.container{max-width:1080px}
.page-heading{margin-bottom:20px}
.section-nav{display:flex;flex-wrap:wrap;gap:8px 20px;margin:16px 0 24px}
.section-nav a{display:inline-flex;align-items:center;min-height:44px}
.tool-panel{margin-bottom:22px}
.tool-layout{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:24px;align-items:start}
.fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.help{font-size:.84rem;color:var(--muted);margin:12px 0 16px;overflow-wrap:anywhere}
.result-panel{background:#f6f8fc;border:1px solid var(--border);border-radius:10px;padding:16px;min-width:0}
.result-panel>label{display:block;font-weight:650;font-size:.9rem;margin-bottom:8px}
.result-panel textarea{min-height:135px;line-height:1.8;font-variant-numeric:tabular-nums;white-space:pre-wrap;overflow-wrap:anywhere;margin-bottom:10px}
#convert-output{min-height:200px}
.interval-row{min-width:0;margin:0 0 16px;padding:14px;border:1px solid var(--border);border-radius:8px}
.interval-row legend{font-size:.9rem;font-weight:650;padding:0 6px}
.row-fields{display:grid;grid-template-columns:minmax(70px,.6fr) repeat(2,minmax(0,1fr)) minmax(0,.8fr) auto;gap:12px;align-items:end}
.row-fields input{font-variant-numeric:tabular-nums}
.action-row{display:flex;flex-wrap:wrap;gap:10px;margin:8px 0}
.work-result{margin-top:20px}
#work-output{min-height:220px}
.status{margin:12px 0 0}
.guide{margin-top:30px;border-top:1px solid var(--border);padding-top:24px;color:var(--muted);font-size:.88rem}
.guide li{margin-bottom:8px;overflow-wrap:anywhere}
.guide ul{padding-inline-start:24px}
input[dir=ltr],textarea[dir=ltr]{direction:ltr;unicode-bidi:isolate;text-align:left}
input,select,button{min-height:44px}
button{overflow-wrap:anywhere}
@media(max-width:800px){.tool-layout{grid-template-columns:1fr}.row-fields{grid-template-columns:repeat(2,minmax(0,1fr))}.remove-row{grid-column:1/-1}}
@media(max-width:480px){.fields{grid-template-columns:1fr}.tool-panel{padding:16px}.result-panel{padding:12px}.action-row button{flex:1 1 100%}.row-fields{gap:12px 8px}.row-fields input{padding:10px 8px}.section-nav{gap:4px 16px}}