.date-hero { margin-bottom: 1.25rem; }
.date-hero h1 { margin-bottom: .4rem; }
[hidden] { display: none !important; }
.date-layout { display: grid; grid-template-columns: minmax(250px, 330px) 1fr; gap: 1rem; align-items: start; }
.date-panel, .date-result { background: var(--c-surface); border: 1px solid var(--c-border); border-radius: var(--radius); padding: 1.35rem; }
.date-panel { position: sticky; top: 4.5rem; }
.date-result > h2 { margin-top: 0; padding-bottom: .85rem; border-bottom: 1px solid var(--c-border); }
.date-field { margin-bottom: .9rem; }
.date-field label { display: block; font-size: .85rem; font-weight: 600; margin-bottom: .35rem; }
.date-field input, .date-field select { width: 100%; min-height: 44px; padding: .6rem .7rem; border: 1px solid var(--c-border); border-radius: var(--radius); background: #fff; color: var(--c-text); font: inherit; }
.date-field input:focus, .date-field select:focus { outline: none; border-color: var(--c-primary); box-shadow: 0 0 0 3px var(--c-primary-light); }
.date-group-label { margin: 1.15rem 0 .7rem; padding-top: 1rem; border-top: 1px solid var(--c-border); color: var(--c-text); font-size: .88rem; font-weight: 600; }
.date-panel .date-group-label:first-of-type { margin-top: 0; padding-top: 0; border-top: 0; }
.inline-control { display: flex; align-items: center; gap: .6rem; }
.inline-control input { flex: 1; min-width: 0; }
.inline-control span { color: var(--c-text-secondary); font-size: .86rem; min-width: 3.8rem; }
.date-input-wrap { position: relative; display: flex; gap: .45rem; }
.date-input-wrap input { min-width: 0; flex: 1; }
.date-input-wrap input[readonly] { cursor: pointer; }
.date-picker-button { min-height: 44px; padding: .55rem .65rem; border: 1px solid var(--c-border); border-radius: var(--radius); background: #fff; color: var(--c-primary); cursor: pointer; font: .82rem inherit; white-space: nowrap; }
.date-picker-button:hover { border-color: var(--c-primary); background: var(--c-primary-light); }
.date-picker-popup { position: absolute; top: calc(100% + .4rem); left: 0; z-index: 20; width: min(300px, 100%); max-width: calc(100vw - 2rem); padding: .85rem; border: 1px solid var(--c-border); border-radius: var(--radius); background: #fff; box-shadow: var(--shadow-md); }
.date-picker-head { display: flex; align-items: center; justify-content: space-between; gap: .5rem; margin-bottom: .65rem; }
.date-picker-head select { min-width: 0; min-height: 36px; padding: .25rem; font-size: .8rem; }
.date-picker-head select[aria-label="Month"] { flex: 1.4; }
.date-picker-head select[aria-label="Year"] { flex: 1; }
.date-picker-time { display: flex; align-items: flex-end; gap: .65rem; border-top: 1px solid var(--c-border); padding-top: .75rem; margin-top: .75rem; }
.date-picker-time label { flex: 1; font-size: .75rem; }
.date-picker-time select { width: 100%; }
.picker-error { color: var(--c-danger); font-size: .8rem; margin: .6rem 0 0; }
.date-picker-nav { min-width: 32px; min-height: 32px; padding: 0; border: 1px solid var(--c-border); border-radius: 6px; background: #fff; color: var(--c-text); cursor: pointer; }
.date-picker-nav:disabled { opacity: .4; cursor: default; }
.date-picker-week, .date-picker-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 3px; text-align: center; }
.date-picker-week span { color: var(--c-text-secondary); font-size: .68rem; font-weight: 600; }
.date-picker-grid button { min-height: 30px; border: 0; border-radius: 5px; background: transparent; color: var(--c-text); cursor: pointer; font: .78rem inherit; }
.date-picker-grid button:hover, .date-picker-grid button[aria-current="date"] { background: var(--c-primary-light); color: var(--c-primary); font-weight: 700; }
.date-picker-grid button:focus-visible, .date-picker-nav:focus-visible, .date-picker-button:focus-visible { outline: 2px solid var(--c-primary); outline-offset: 2px; }
.date-picker-footer { display: flex; justify-content: flex-end; gap: .5rem; border-top: 1px solid var(--c-border); padding-top: .75rem; margin-top: .75rem; }
.output-actions { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .75rem; margin-top: 1.2rem; }
.output-group { display: flex; flex-wrap: wrap; align-content: flex-start; gap: .55rem; min-width: 0; padding: .85rem; border: 1px solid var(--c-border); border-radius: var(--radius); background: #FBFAF6; }
.output-group .btn { justify-content: center; background: #fff; }
.output-group-label { width: 100%; color: var(--c-text-secondary); font-size: .78rem; font-weight: 600; }
.date-checks { display: grid; gap: .45rem; margin: 1rem 0; padding: .8rem .9rem; border: 1px solid var(--c-border); border-radius: var(--radius); background: #FBFAF6; font-size: .88rem; }
.date-checks legend { padding: 0 .3rem; color: var(--c-text-secondary); font-size: .8rem; font-weight: 600; }
.date-checks label { display: flex; gap: .45rem; align-items: center; }
.date-actions { display: flex; flex-wrap: wrap; gap: .55rem; margin-top: 1rem; }
.date-actions .btn { flex: 1; justify-content: center; }
.date-status { min-height: 1.35rem; margin: .75rem 0; font-size: .85rem; }
.date-status.error { color: var(--c-danger); }
.date-status.success { color: var(--c-success); }
.date-summary { color: var(--c-text); font-size: clamp(1.45rem, 3vw, 1.8rem); font-weight: 700; letter-spacing: -0.02em; line-height: 1.25; margin: 1.05rem 0 1.2rem; }
.tool-choice { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; margin: 1.25rem 0; }
.tool-choice .choice-card { display: block; padding: 1.25rem; border: 1px solid var(--c-border); border-radius: var(--radius); background: #fff; color: inherit; text-decoration: none; }
.tool-choice .choice-card:hover { border-color: var(--c-primary); }
.choice-card h3 { margin: 0 0 .35rem; font-size: 1.02rem; }
.choice-card p { margin: 0; font-size: .9rem; }
.date-summary-table { width: 100%; border-collapse: collapse; margin: .75rem 0 1rem; font-size: .9rem; }
.date-summary-table th, .date-summary-table td { padding: .6rem .7rem; border-bottom: 1px solid var(--c-border); text-align: left; }
.date-summary-table th { color: var(--c-text-secondary); font-weight: 600; background: #F1EFE9; }
.date-summary-table td:last-child, .date-summary-table th:last-child { text-align: right; }
.definition-list { display: grid; gap: .8rem; margin: 1rem 0; }
.definition-list div { padding: .8rem 1rem; background: #FBFAF6; border-left: 3px solid var(--c-primary-light); }
.definition-list dt { font-weight: 600; }
.definition-list dd { margin: .2rem 0 0; color: var(--c-text-secondary); font-size: .9rem; }
.date-facts { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: .65rem; margin-bottom: 1rem; }
.duration-breakdown { display: grid; grid-template-columns: repeat(auto-fit, minmax(125px, 1fr)); gap: .65rem; margin-bottom: 1rem; }
.date-fact { background: #FBFAF6; border: 1px solid var(--c-border); border-radius: var(--radius); padding: .85rem; }
.date-fact small { display: block; color: var(--c-text-secondary); font-size: .75rem; }
.date-fact strong { display: block; margin-top: .15rem; font-family: var(--font-mono); font-weight: 600; font-size: .9rem; }
.date-list { max-height: 360px; overflow: auto; border: 1px solid var(--c-border); border-radius: var(--radius); padding: .65rem 1.8rem; margin: .8rem 0; }
.date-list li { padding: .2rem 0; font-variant-numeric: tabular-nums; }
.code-output { width: 100%; min-height: 90px; margin-top: .75rem; padding: .7rem; border: 1px solid var(--c-border); border-radius: var(--radius); background: #1A1B1E; color: #E9E7DF; font: .78rem/1.5 var(--font-mono); resize: vertical; }
.muted-note { color: var(--c-text-secondary); font-size: .85rem; }
@media (max-width: 900px) { .output-actions { grid-template-columns: 1fr; } }
@media (max-width: 720px) { .date-layout { grid-template-columns: 1fr; } .date-panel { position: static; } .date-panel, .date-result { padding: 1rem; } }
@media (max-width: 640px) { .tool-choice { grid-template-columns: 1fr; } }
@media (max-width: 420px) { .date-input-wrap { display: block; } .date-picker-button { width: 100%; margin-top: .4rem; } }