/* Time zone calculator TZN-17. Instrument Sheet chassis, accent #2A6E7A (peacock). */
:root{
  --paper:#EDE9E2;
  --ink:#1E1D1B;
  --panel:#DEDACF;
  --line:#B7B0A2;
  --chassis:#2A2924;
  --accent:#2A6E7A;
  --on-accent:#EDE9E2;      /* paper on peacock is 4.8:1, so paper type on the slab is fine at any size */
  --slab-paper:#EDE9E2;     /* the paper insets on the slab keep their colour in both schemes */
  --slab-ink:#1E1D1B;
  --night:rgba(0,0,0,.38);  /* a night cell on the slab */
  --dusk:rgba(0,0,0,.12);   /* awake but not at a desk */
  --hair:rgba(237,233,226,.22);
  --font-ui:"Familjen Grotesk",system-ui,sans-serif;
  --font-spec:"Martian Mono",ui-monospace,monospace;
  --ease:cubic-bezier(.2,.8,.2,1);
  --tick:.22s;
}
@media (prefers-color-scheme:dark){
  :root{--paper:#1E1D1B;--ink:#EDE9E2;--panel:#2A2924;--line:#4A473F;--chassis:#111}
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font-ui);font-size:1rem;line-height:1.55;overflow-x:hidden}
a{color:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
button{font:inherit;color:inherit}
h1,h2,h3,p,dl,dd,ol,ul,figure,pre,fieldset,blockquote{margin:0}
ol,ul{padding:0;list-style:none}
fieldset{padding:0;border:0;min-width:0}
[hidden]{display:none!important}
code{font-family:var(--font-spec);font-size:.8em}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* label strip */
.strip{max-width:1120px;margin:0 auto;padding:18px 32px 0;display:flex;justify-content:space-between;align-items:baseline;font-family:var(--font-spec);font-size:.75rem;font-weight:500;letter-spacing:.02em;border-bottom:1px solid var(--line)}
.strip-maker{text-decoration:none;padding-bottom:12px}
.strip-maker:hover{text-decoration:underline;text-underline-offset:3px}
.strip-code{padding-bottom:12px}

/* page */
.wrap{max-width:1120px;margin:0 auto;padding:40px 32px 0}
.title{font-size:4.5rem;font-weight:600;line-height:1;letter-spacing:-.01em;margin-bottom:16px}
.lede{font-size:1.125rem;max-width:60ch;margin-bottom:28px}
.lede strong{font-weight:600}
.subhead{font-size:1.375rem;font-weight:500;line-height:1.25}
.section-head{font-size:2rem;font-weight:600;line-height:1.1;margin:40px 0 14px}

/* the peacock slab: the one accent shape. The board is the instrument, the clock its headline */
.hero{position:relative;background:var(--accent);color:var(--on-accent);padding:36px 40px 36px}
.hero::before,.hero::after,.hero>.ticks::before,.hero>.ticks::after{content:"";position:absolute;width:14px;height:14px;border:0 solid var(--on-accent);pointer-events:none;z-index:2}
.hero::before{top:0;left:0;border-top-width:1px;border-left-width:1px}
.hero::after{top:0;right:0;border-top-width:1px;border-right-width:1px}
.hero>.ticks::before{bottom:0;left:0;border-bottom-width:1px;border-left-width:1px}
.hero>.ticks::after{bottom:0;right:0;border-bottom-width:1px;border-right-width:1px}

/* the clock */
.clock{margin-bottom:22px}
.clock-row{display:flex;align-items:baseline;flex-wrap:wrap;gap:0 .2em;line-height:1}
.clock-time{font-size:clamp(4.5rem,12vw,9.5rem);font-weight:600;letter-spacing:-.03em;font-variant-numeric:tabular-nums;display:inline-block}
.clock-time.is-tick{animation:tick var(--tick) var(--ease) both}
.clock-ampm{font-size:clamp(1.5rem,3.5vw,2.75rem);font-weight:600;letter-spacing:-.01em}
.clock-where{flex-basis:100%;font-size:1.375rem;font-weight:500;line-height:1.25;margin-top:10px}
@keyframes tick{0%{transform:translateY(.28em);opacity:.4}100%{transform:none;opacity:1}}
.verdict{font-size:1.375rem;font-weight:500;line-height:1.3;max-width:56ch;margin-top:10px;min-height:1.3em}

/* the from row */
.from{display:flex;flex-wrap:wrap;align-items:flex-end;gap:12px 14px;margin-bottom:22px}
.from-field{min-width:0}
.from-zone{flex:1 1 300px}
.from-now{align-self:flex-end}
.from-label{display:block;font-size:.9375rem;font-weight:500;margin-bottom:6px}
.field{display:block;width:100%;font:inherit;font-size:1rem;line-height:1.3;color:var(--slab-ink);background:var(--slab-paper);border:1px solid var(--slab-paper);border-radius:0;padding:10px 12px;color-scheme:light;min-height:44px}
.field::placeholder{color:var(--slab-ink);opacity:.55}
.field:focus-visible{outline:2px solid var(--on-accent);outline-offset:3px}
input[type=date].field,input[type=time].field{width:auto;min-width:9.5em;font-variant-numeric:tabular-nums}

/* the picker */
.pick{position:relative}
.pick-list{position:absolute;left:0;right:0;top:calc(100% + 4px);z-index:6;background:var(--slab-paper);color:var(--slab-ink);border:1px solid var(--slab-ink);max-height:320px;overflow:auto}
.pick-list li{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:2px 14px;align-items:baseline;padding:9px 12px;border-bottom:1px solid var(--line);cursor:pointer}
.pick-list li:last-child{border-bottom:0}
.pick-list li[aria-selected=true],.pick-list li:hover{background:var(--accent);color:var(--on-accent)}
.pick-city{font-weight:500;overflow-wrap:anywhere}
.pick-zone{grid-column:1 / span 2;font-family:var(--font-spec);font-size:.6875rem;letter-spacing:.02em;opacity:.8;overflow-wrap:anywhere}
.pick-off{font-family:var(--font-spec);font-size:.6875rem;letter-spacing:.02em;white-space:nowrap}
.pick-none{padding:9px 12px;font-size:.9375rem;opacity:.75;cursor:default}

/* the board */
.board{position:relative;border-top:1px solid var(--hair);cursor:ew-resize;user-select:none;-webkit-user-select:none;touch-action:pan-y}
.board:focus-visible{outline:2px solid var(--on-accent);outline-offset:6px}
.axis,.row{display:grid;grid-template-columns:200px minmax(0,1fr) 150px 140px;gap:0 18px;align-items:center;border-bottom:1px solid var(--hair)}
.axis{height:40px;font-family:var(--font-spec);font-size:.6875rem;letter-spacing:.02em;font-weight:500}
.axis-zone{font-family:var(--font-ui);font-size:.875rem;font-weight:400;letter-spacing:0;opacity:.85;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.axis-strip{display:grid;grid-template-columns:repeat(24,minmax(0,1fr));height:100%;align-items:end}
.axis-strip span{padding-bottom:6px;opacity:.85}
.row{min-height:64px;padding:8px 0}
.row.is-new .cell.is-work{animation:light .28s var(--ease) both;animation-delay:calc(var(--i) * 12ms)}
@keyframes light{0%{background:var(--dusk)}100%{background:var(--slab-paper)}}
.zone{min-width:0}
.zone-name{display:block;font-size:1.0625rem;font-weight:600;line-height:1.15;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.zone-spec{display:block;font-family:var(--font-spec);font-size:.6875rem;letter-spacing:.02em;font-weight:500;margin-top:4px;opacity:.85;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.zone-from{display:inline-block;font-family:var(--font-spec);font-size:.625rem;letter-spacing:.04em;padding:1px 5px;background:var(--slab-paper);color:var(--slab-ink);margin-left:6px;vertical-align:2px}
.cells{display:grid;grid-template-columns:repeat(24,minmax(0,1fr));height:44px;border-left:1px solid var(--hair);border-right:1px solid var(--hair)}
.cell{background:var(--dusk);position:relative}
.cell:nth-child(3n+1):not(:first-child){border-left:1px solid var(--hair)}
.cell.is-work{background:var(--slab-paper)}
.cell.is-night{background:var(--night)}
.cell.is-midnight{border-left:3px solid var(--slab-ink)}
.out{text-align:right;min-width:0}
.out-time{display:block;font-size:1.75rem;font-weight:600;line-height:1;letter-spacing:-.02em;font-variant-numeric:tabular-nums;white-space:nowrap}
.out-time.is-tick{animation:tick var(--tick) var(--ease) both}
.out-date{display:block;font-size:.875rem;margin-top:4px;white-space:nowrap}
.out-shift{display:inline-block;font-family:var(--font-spec);font-size:.6875rem;letter-spacing:.02em;font-weight:500;background:var(--slab-paper);color:var(--slab-ink);padding:1px 6px;margin-left:6px;vertical-align:1px}
.tools{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:6px;cursor:default}
.btn-tiny{padding:5px 8px;font-size:.8125rem;background:transparent;border:1px solid var(--hair);color:var(--on-accent);border-radius:0;cursor:pointer;line-height:1.2}
.btn-tiny:hover{border-color:var(--on-accent);background:rgba(237,233,226,.12)}
.btn-tiny:focus-visible{outline-color:var(--on-accent)}

/* the overlay: one needle and the overlap frames, laid over every row at once */
.overlay{position:absolute;inset:0;pointer-events:none}
.needle{position:absolute;top:0;bottom:0;width:2px;background:var(--slab-paper);transform:translateX(-1px);z-index:3}
.needle::before{content:"";position:absolute;left:50%;top:-1px;width:10px;height:10px;background:var(--slab-paper);transform:translate(-50%,-50%) rotate(45deg)}
.needle-flag{position:absolute;top:3px;left:8px;font-family:var(--font-spec);font-size:.6875rem;letter-spacing:.02em;font-weight:500;background:var(--slab-paper);color:var(--slab-ink);padding:2px 6px;white-space:nowrap;line-height:1.3}
.needle.is-left .needle-flag{left:auto;right:8px}
.band{position:absolute;top:40px;bottom:0;border:2px solid var(--slab-paper);z-index:2}
.band-label{position:absolute;left:-2px;bottom:-2px;font-family:var(--font-spec);font-size:.625rem;letter-spacing:.04em;font-weight:500;background:var(--slab-paper);color:var(--slab-ink);padding:1px 5px;white-space:nowrap}
.board.is-dragging .needle{transition:none}
.board-empty{font-size:1.125rem;padding:18px 0 4px}

/* add row */
.add{display:flex;align-items:center;gap:14px;margin-top:18px}
.pick-add{flex:1 1 320px;max-width:520px}
.add-count{font-family:var(--font-spec);font-size:.75rem;letter-spacing:.02em;font-weight:500;white-space:nowrap}

/* buttons */
.actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:16px}
.btn{position:relative;display:inline-block;padding:12px 18px;border:1px solid var(--ink);background:var(--paper);color:var(--ink);font-weight:500;line-height:1.2;cursor:pointer;border-radius:0;text-decoration:none}
.btn:hover{background:var(--panel)}
.btn:disabled{opacity:.45;cursor:default}
.btn-primary{background:var(--slab-ink);border-color:var(--slab-ink);color:var(--slab-paper)}
.btn-primary:hover{background:var(--slab-ink)}
.btn-primary.is-done{background:var(--slab-paper);border-color:var(--slab-paper);color:var(--slab-ink)}
.btn-primary .ticks{position:absolute;inset:0;pointer-events:none}
.btn-primary::before,.btn-primary::after,.btn-primary .ticks::before,.btn-primary .ticks::after{content:"";position:absolute;width:14px;height:14px;border:0 solid var(--on-accent);opacity:0;pointer-events:none}
.btn-primary::before{top:-6px;left:-6px;border-top-width:1px;border-left-width:1px}
.btn-primary::after{top:-6px;right:-6px;border-top-width:1px;border-right-width:1px}
.btn-primary .ticks::before{bottom:-6px;left:-6px;border-bottom-width:1px;border-left-width:1px}
.btn-primary .ticks::after{bottom:-6px;right:-6px;border-bottom-width:1px;border-right-width:1px}
.btn-primary:hover::before,.btn-primary:hover::after,.btn-primary:hover .ticks::before,.btn-primary:hover .ticks::after,
.btn-primary:focus-visible::before,.btn-primary:focus-visible::after,.btn-primary:focus-visible .ticks::before,.btn-primary:focus-visible .ticks::after{opacity:1}
.btn-primary:focus-visible{outline-color:var(--on-accent);outline-offset:4px}
.btn-paper{background:var(--slab-paper);border-color:var(--slab-paper);color:var(--slab-ink)}
.btn-paper:hover{background:#DEDACF}
.btn-paper:focus-visible{outline-color:var(--on-accent)}
.btn-paper.is-done{background:var(--slab-ink);border-color:var(--slab-ink);color:var(--slab-paper)}
.seg{display:inline-flex;border:1px solid var(--slab-paper)}
.seg-btn{padding:12px 14px;border:0;background:transparent;color:var(--on-accent);font-weight:500;line-height:1.2;cursor:pointer;border-radius:0}
.seg-btn+.seg-btn{border-left:1px solid var(--slab-paper)}
.seg-btn[aria-checked=true]{background:var(--slab-paper);color:var(--slab-ink)}
.seg-btn:focus-visible{outline-color:var(--on-accent);outline-offset:-3px}
.hint{font-size:1.125rem;font-weight:500;margin-left:6px}

/* reading line */
.reading{font-family:var(--font-spec);font-size:.75rem;font-weight:500;letter-spacing:.02em;white-space:pre;margin:12px 0 0}
.note-url{font-size:.9375rem;margin-top:8px;opacity:.85}

/* under the slab: notes on the left, a panel on the right */
.under{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:24px 32px;margin-top:32px;align-items:start}
.left{grid-column:span 7;min-width:0}
.controls{grid-column:span 5;min-width:0}
.tabnotes{margin-bottom:24px}
.tabnotes p{max-width:64ch;margin-top:8px}
.panel{position:relative;border:1px solid var(--line);background:var(--panel);padding:24px 28px 28px;display:grid;gap:24px}
.field-set{min-width:0}
.field-set legend{font-size:1rem;font-weight:500;margin-bottom:8px;padding:0}
.field-note{font-size:.9375rem;margin-top:6px;opacity:.9}
.keys div{display:flex;justify-content:space-between;gap:12px;padding:8px 0;border-bottom:1px solid var(--line);font-size:.9375rem}
.keys div:last-child{border-bottom:0}
.keys dd{white-space:nowrap}

/* notes */
.notes{display:grid;grid-template-columns:repeat(12,minmax(0,1fr))}
.notes>*{grid-column:span 8}
.notes p{max-width:68ch;margin-bottom:14px}

.foot{max-width:1120px;margin:0 auto;padding:20px 32px 40px;font-size:.875rem;opacity:.8}
.foot p{max-width:70ch}

/* narrow screens */
@media (max-width:1040px){
  .axis,.row{grid-template-columns:160px minmax(0,1fr) 130px 118px;gap:0 12px}
}
@media (max-width:960px){
  .notes>*{grid-column:span 12}
  .under{grid-template-columns:1fr}
  .left,.controls{grid-column:span 1}
  .controls{order:2}
}
@media (max-width:760px){
  .axis,.row{grid-template-columns:112px minmax(0,1fr);gap:0 10px;align-items:center}
  .axis-zone{display:none}
  .axis-strip{grid-column:2}
  .axis-time{display:none}
  .row{grid-template-areas:"zone strip" "out strip" "tools strip";grid-template-rows:auto auto auto;padding:12px 0 10px}
  .zone{grid-area:zone}
  .zone-name{white-space:normal;line-height:1.1}
  .zone-spec{white-space:normal}
  .out{grid-area:out;text-align:left;margin-top:8px}
  .out-time{font-size:1.25rem}
  .out-date{font-size:.8125rem}
  .tools{grid-area:tools;justify-content:flex-start;margin-top:8px;position:relative;z-index:4}
  .cells{grid-area:strip;height:48px;align-self:center}
  .needle-flag{top:auto;bottom:100%;margin-bottom:0}
  .needle::before{display:none}
}
@media (max-width:640px){
  .strip{padding:14px 16px 0}
  .wrap{padding:28px 16px 0}
  .title{font-size:2.75rem}
  .lede{font-size:1rem}
  .hero{padding:22px 16px 22px}
  .clock-where{font-size:1.125rem}
  .verdict{font-size:1.125rem}
  .from{gap:10px}
  .from-zone{flex-basis:100%}
  input[type=date].field,input[type=time].field{min-width:0;width:100%}
  .from-field:not(.from-zone):not(.from-now){flex:1 1 30%}
  .from-now{flex:0 0 auto}
  .out-time{font-size:1.375rem}
  .hint{display:none}
  .add{flex-wrap:wrap}
  .panel{padding:20px 16px 22px;gap:20px}
  .section-head{font-size:1.625rem}
  .foot{padding:16px 16px 32px}
  .seg-btn{padding:12px 10px;font-size:.9375rem}
}

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