/* Slide Timezone — design system adapted from the Calendly style reference.
   Layout: centered 1200px stack — hero, converter card on soft blobs,
   24-hour overlap grid, labelled ad rails, conversion table, footer. */

:root{
  --canvas:#f8f9fb;
  --surface:#ffffff;
  --surface-2:#f0f3f8;
  --hairline:#d4e0ed;
  --ink:#0b3558;
  --muted:#476788;
  --faint:#a6bbd1;
  --accent:#006bff;
  --accent-soft:#e6f0ff;
  --accent-text:#004eba;
  --on-accent:#ffffff;
  --blob-a:#e55cff;
  --blob-b:#0099ff;
  --blob-alpha:.30;
  --cell-sleep:#e9eef5;
  --cell-awake:#b9d6ff;
  --cell-work:#006bff;
  --tick:rgba(255,255,255,.55);
  --track-work:#006bff; --track-awake:#8fbaff; --track-sleep:#cdd7e4;
  --accent-ring:rgba(0,107,255,.45);
  --shadow-card:rgba(71,103,136,.04) 0 4px 5px, rgba(71,103,136,.03) 0 8px 15px, rgba(71,103,136,.08) 0 30px 50px;
  --shadow-soft:rgba(71,103,136,.04) 0 4px 5px, rgba(71,103,136,.03) 0 4px 10px, rgba(71,103,136,.05) 0 10px 20px;
  --font:'Manrope', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --maxw:1200px;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --canvas:#08111d; --surface:#0f1c2e; --surface-2:#16283f; --hairline:#243b55;
    --ink:#e9f0f8; --muted:#9cb3cc; --faint:#657f9c;
    --accent:#4d94ff; --accent-soft:#132a49; --accent-text:#9cc4ff; --on-accent:#06121f;
    --blob-alpha:.20; --cell-sleep:#132234; --cell-awake:#20406b; --cell-work:#4d94ff;
    --tick:rgba(8,17,29,.5); --accent-ring:rgba(77,148,255,.55); --track-work:#4d94ff; --track-awake:#2f5f9e; --track-sleep:#0a1424;
    --shadow-card:rgba(0,0,0,.30) 0 4px 5px, rgba(0,0,0,.24) 0 8px 15px, rgba(0,0,0,.36) 0 30px 50px;
    --shadow-soft:rgba(0,0,0,.26) 0 4px 5px, rgba(0,0,0,.20) 0 4px 10px, rgba(0,0,0,.28) 0 10px 20px;
    color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --canvas:#08111d; --surface:#0f1c2e; --surface-2:#16283f; --hairline:#243b55;
  --ink:#e9f0f8; --muted:#9cb3cc; --faint:#657f9c;
  --accent:#4d94ff; --accent-soft:#132a49; --accent-text:#9cc4ff; --on-accent:#06121f;
  --blob-alpha:.20; --cell-sleep:#132234; --cell-awake:#20406b; --cell-work:#4d94ff;
  --tick:rgba(8,17,29,.5); --accent-ring:rgba(77,148,255,.55); --track-work:#4d94ff; --track-awake:#2f5f9e; --track-sleep:#0a1424;
  --shadow-card:rgba(0,0,0,.30) 0 4px 5px, rgba(0,0,0,.24) 0 8px 15px, rgba(0,0,0,.36) 0 30px 50px;
  --shadow-soft:rgba(0,0,0,.26) 0 4px 5px, rgba(0,0,0,.20) 0 4px 10px, rgba(0,0,0,.28) 0 10px 20px;
  color-scheme:dark;
}

*{box-sizing:border-box}
html,body{margin:0}
body{
  background:var(--canvas); color:var(--ink);
  font-family:var(--font); font-size:16px; line-height:1.5;
  -webkit-font-smoothing:antialiased;
  /* clip, not hidden: stops sideways scroll without breaking the sticky nav */
  overflow-x:clip;
}
.wrap{max-width:var(--maxw);margin:0 auto;padding-inline:20px}
h1,h2,h3,h4{margin:0;text-wrap:balance;letter-spacing:-.01em}
h1{font-size:clamp(34px,5.2vw,58px);font-weight:800;line-height:1.1}
h2{font-size:clamp(28px,3.6vw,40px);font-weight:700;line-height:1.18}
h3{font-size:22px;font-weight:700;line-height:1.3}
p{margin:0}
button{font-family:inherit}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:12px;top:12px;background:var(--surface);padding:10px 14px;border-radius:8px;z-index:99}

/* ---- nav ---- */
.nav{
  position:sticky;top:0;z-index:40;
  background:var(--canvas);
  border-bottom:1px solid var(--hairline);
}
.nav-in{display:flex;align-items:center;gap:16px;min-height:64px;flex-wrap:wrap;padding-block:10px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:18px;color:var(--ink);margin-right:auto}
.brand:hover{text-decoration:none}
.mark{width:28px;height:28px;flex:none}
.nav-right{display:flex;align-items:center;gap:10px}
/* On a phone the bar wraps to two rows; sticky would cost 100px of every screen. */
@media (max-width:560px){.nav{position:static}}

/* ---- buttons ---- */
.btn{
  border:none;border-radius:8px;padding:10px 16px;
  font-size:15px;font-weight:600;cursor:pointer;
  display:inline-flex;align-items:center;gap:8px;
  transition:transform .12s ease, background .12s ease;
}
.btn:active{transform:translateY(1px)}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--accent);color:var(--on-accent);box-shadow:var(--shadow-soft)}
.btn-dark{background:var(--ink);color:var(--canvas)}
.btn-ghost{background:transparent;color:var(--ink);border:1px solid var(--hairline)}
.btn-ghost:hover{background:var(--surface-2)}
.btn-icon{padding:10px;line-height:0}
.btn-icon svg{display:block}
.btn-icon .ico-sun{display:none}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]) .btn-icon .ico-moon{display:none}
  :root:not([data-theme="light"]) .btn-icon .ico-sun{display:block}
}
:root[data-theme="dark"] .btn-icon .ico-moon{display:none}
:root[data-theme="dark"] .btn-icon .ico-sun{display:block}

/* ---- breadcrumb ---- */
.crumb{font-size:13px;color:var(--muted);font-weight:500;padding-block:18px 0}
.crumb a{color:var(--muted)}
.crumb span{color:var(--faint);margin-inline:6px}

/* ---- hero ---- */
.hero{padding-block:28px 20px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--accent-soft);color:var(--accent-text);
  font-size:12px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;
  border-radius:9999px;padding:5px 12px;
}
.dot-live{width:7px;height:7px;border-radius:50%;background:var(--accent);animation:pulse 2.4s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
.hero h1{margin-top:14px;max-width:none}
.hero-sub{margin-top:16px;color:var(--muted);font-size:19px;max-width:60ch}
.answer{
  margin-top:20px;font-size:18px;font-weight:600;color:var(--ink);
  max-width:62ch;line-height:1.55;
}
.answer b{color:var(--accent-text);font-variant-numeric:tabular-nums}

/* ---- blobs + card ---- */
.stage{position:relative;padding-block:8px 0}
/* Blobs are atmosphere only. They stay inside the stage box so they can never
   widen the page; the blur does the work of softening them off the edges. */
.blob{position:absolute;border-radius:50%;filter:blur(60px);opacity:var(--blob-alpha);pointer-events:none;z-index:0;max-width:100%}
.blob-1{width:min(340px,70%);aspect-ratio:1;background:var(--blob-a);left:0;top:0}
.blob-2{width:min(420px,80%);aspect-ratio:1;background:var(--blob-b);right:0;bottom:0}

.card{
  position:relative;z-index:1;
  background:var(--surface);border-radius:24px;
  box-shadow:var(--shadow-card);padding:24px;
}
.card-plain{border-radius:16px}
.converter{display:flex;flex-direction:column;gap:28px}
.conv-cols{display:grid;grid-template-columns:minmax(0,420px) minmax(0,1fr);gap:28px}
@media (max-width:860px){.conv-cols{grid-template-columns:minmax(0,1fr)}}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:14px;flex-wrap:wrap}
.panel-title{font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}

.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px;min-width:0}
.field label{font-size:13px;font-weight:600;color:var(--muted)}
select,input[type="date"],input[type="time"],input[type="text"]{
  font-family:inherit;font-size:16px;font-weight:500;
  color:var(--ink);background:var(--surface-2);
  border:1px solid var(--hairline);border-radius:8px;
  padding:11px 12px;width:100%;min-width:0;
}
.row-2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:420px){.row-2{grid-template-columns:1fr}}

/* ---- the slider: the centrepiece of the converter ---- */
.slidebar{
  background:var(--surface-2);border:1px solid var(--hairline);
  border-radius:20px;padding:24px 24px 20px;
}
.slidebar-top{display:flex;align-items:flex-end;justify-content:space-between;gap:16px 24px;flex-wrap:wrap;margin-bottom:22px}
.slidebar-read .t{
  margin-top:6px;font-size:clamp(38px, 7.2vw, 61px);font-weight:800;line-height:1;
  letter-spacing:-.02em;font-variant-numeric:tabular-nums;
}
.slidebar-read .d{margin-top:10px;color:var(--muted);font-size:15px;font-weight:600}
.slidebar-read .status{margin-left:2px}

.slider-wrap{--thumb:44px;position:relative;margin-bottom:8px}
input[type="range"]{
  -webkit-appearance:none;appearance:none;display:block;
  width:100%;height:var(--thumb);margin:0;background:transparent;cursor:grab;
  touch-action:pan-y;
}
input[type="range"]:active{cursor:grabbing}
input[type="range"]:focus-visible{outline:none}
input[type="range"]::-webkit-slider-runnable-track{
  box-sizing:border-box;height:28px;border-radius:9999px;
  background:
    repeating-linear-gradient(90deg, transparent 0, transparent calc(100% / 24 - 1px), var(--tick) calc(100% / 24 - 1px), var(--tick) calc(100% / 24)),
    var(--track, var(--surface));
  border:1px solid var(--hairline);
}
input[type="range"]::-moz-range-track{
  box-sizing:border-box;height:28px;border-radius:9999px;
  background:
    repeating-linear-gradient(90deg, transparent 0, transparent calc(100% / 24 - 1px), var(--tick) calc(100% / 24 - 1px), var(--tick) calc(100% / 24)),
    var(--track, var(--surface));
  border:1px solid var(--hairline);
}
/* White-faced thumb with a grip: reads as draggable on every track colour. */
input[type="range"]::-webkit-slider-thumb{
  -webkit-appearance:none;appearance:none;box-sizing:border-box;
  width:var(--thumb);height:var(--thumb);border-radius:50%;
  border:4px solid var(--ink);margin-top:-9px;
  background:
    linear-gradient(var(--ink),var(--ink)) 14px 12px / 2px 12px no-repeat,
    linear-gradient(var(--ink),var(--ink)) 20px 12px / 2px 12px no-repeat,
    var(--surface);
  box-shadow:var(--shadow-card);
}
input[type="range"]::-moz-range-thumb{
  box-sizing:border-box;width:var(--thumb);height:var(--thumb);border-radius:50%;
  border:4px solid var(--ink);
  background:
    linear-gradient(var(--ink),var(--ink)) 14px 12px / 2px 12px no-repeat,
    linear-gradient(var(--ink),var(--ink)) 20px 12px / 2px 12px no-repeat,
    var(--surface);
  box-shadow:var(--shadow-card);
}
input[type="range"]:focus-visible::-webkit-slider-thumb{outline:3px solid var(--accent);outline-offset:3px}
input[type="range"]:focus-visible::-moz-range-thumb{outline:3px solid var(--accent);outline-offset:3px}
/* A gentle ring until the first drag, so the control invites being moved. */
.slider-wrap.untouched input[type="range"]::-webkit-slider-thumb{animation:thumb-ring 2.2s ease-out infinite}
.slider-wrap.untouched input[type="range"]::-moz-range-thumb{animation:thumb-ring 2.2s ease-out infinite}
@keyframes thumb-ring{
  0%{box-shadow:var(--shadow-card), 0 0 0 0 var(--accent-ring)}
  70%{box-shadow:var(--shadow-card), 0 0 0 14px transparent}
  100%{box-shadow:var(--shadow-card), 0 0 0 0 transparent}
}

/* Hour labels, positioned on the same scale as the thumb's travel. */
.slider-ticks{position:relative;height:20px;margin-top:2px}
.slider-ticks span{
  position:absolute;top:0;transform:translateX(-50%);
  left:calc(var(--thumb) / 2 + (100% - var(--thumb)) * var(--f));
  font-size:12px;font-weight:700;color:var(--muted);white-space:nowrap;
  font-variant-numeric:tabular-nums;
}
.quick{display:flex;gap:8px;flex-wrap:wrap}
.chip{
  background:var(--surface-2);border:1px solid var(--hairline);color:var(--ink);
  font-size:13px;font-weight:600;border-radius:9999px;padding:6px 13px;cursor:pointer;
}
.chip:hover{border-color:var(--accent);color:var(--accent-text)}

/* ---- city rows ---- */
.cities{display:flex;flex-direction:column;gap:10px}
.city{display:flex;align-items:center;gap:14px;border:1px solid var(--hairline);border-radius:16px;padding:14px 16px;background:var(--surface);min-width:0}
.city-main{min-width:0;flex:1}
.city-name{font-size:17px;font-weight:700;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.abbr{font-size:11px;font-weight:700;letter-spacing:.04em;background:var(--accent-soft);color:var(--accent-text);border-radius:9999px;padding:2px 8px}
.city-sub{font-size:13px;color:var(--muted);font-weight:500;margin-top:2px}
.city-time{text-align:right;flex:none}
.city-time .t{font-size:24px;font-weight:800;line-height:1.1;font-variant-numeric:tabular-nums}
.city-time .d{font-size:12px;color:var(--muted);font-weight:600;margin-top:2px;white-space:nowrap}
.daypill{color:var(--accent-text);font-weight:700}
.remove{background:transparent;border:none;color:var(--faint);font-size:20px;line-height:1;cursor:pointer;padding:4px 6px;border-radius:8px;flex:none}
.remove:hover{background:var(--surface-2);color:var(--ink)}
.adder{display:flex;gap:10px;margin-top:14px;flex-wrap:wrap}
.adder input{flex:1;min-width:180px}
.empty{border:1px dashed var(--hairline);border-radius:16px;padding:22px;color:var(--muted);font-size:15px;text-align:center}

/* ---- overlap grid ---- */
.section{padding-block:52px 0}
.section-head{max-width:640px;margin-bottom:24px}
.section-head p{color:var(--muted);margin-top:10px;font-size:17px}
.grid-scroll{overflow-x:auto;padding-bottom:6px}
.grid{min-width:720px}
.grow{display:flex;align-items:center;gap:12px;margin-bottom:6px}
.glabel{width:170px;flex:none;font-size:13px;font-weight:700;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.glabel small{display:block;font-weight:500;color:var(--muted);font-size:11px}
.gcells{display:grid;grid-template-columns:repeat(24,minmax(0,1fr));gap:2px;flex:1;min-width:0}
.gcell{height:26px;border-radius:4px;background:var(--cell-sleep)}
.gcell.awake{background:var(--cell-awake)}
.gcell.work{background:var(--cell-work)}
.ghead .gcell{background:transparent;height:auto;font-size:11px;font-weight:700;color:var(--faint);text-align:center;cursor:pointer;padding:2px 0;font-variant-numeric:tabular-nums}
.ghead .gcell:hover{color:var(--accent)}
.gcell.now{box-shadow:inset 0 0 0 2px var(--ink)}
.ghead .gcell.now{color:var(--ink);box-shadow:none}
.legend{display:flex;gap:18px;flex-wrap:wrap;margin-top:16px;font-size:13px;color:var(--muted);font-weight:600}
.legend span{display:inline-flex;align-items:center;gap:7px}
.swatch{width:14px;height:14px;border-radius:4px}

/* ---- conversion table ---- */
.table-scroll{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-size:15px}
caption{text-align:left;color:var(--muted);font-size:14px;padding-bottom:12px}
th,td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--hairline);font-variant-numeric:tabular-nums}
th{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-weight:700}
tbody tr:last-child td{border-bottom:none}
tr.highlight td{background:var(--accent-soft);font-weight:700}
td .note{color:var(--accent-text);font-weight:700;font-size:13px}
td .off{color:var(--faint);font-size:13px;font-weight:600}

/* ---- prose ---- */
.prose{max-width:68ch;display:flex;flex-direction:column;gap:14px}
.prose p{color:var(--muted);font-size:17px}
.prose h3{color:var(--ink);margin-top:10px}
.prose strong{color:var(--ink)}

/* ---- ads ---- */
.ad{margin-block:40px}
.ad-label{display:block;font-size:11px;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);margin-bottom:6px}
.ad-slot{
  border:1px dashed var(--hairline);border-radius:16px;background:var(--surface);
  display:flex;align-items:center;justify-content:center;
  color:var(--faint);font-size:13px;font-weight:600;
  min-height:var(--ad-h,90px);text-align:center;padding:12px;
}

/* ---- link grids ---- */
.pills{display:flex;flex-wrap:wrap;gap:8px}
.pill-link{
  background:var(--surface);border:1px solid var(--hairline);border-radius:9999px;
  padding:7px 14px;font-size:14px;font-weight:600;color:var(--ink);
}
.pill-link:hover{border-color:var(--accent);color:var(--accent-text);text-decoration:none}
.pair-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:10px}
.pair-link{
  display:flex;justify-content:space-between;align-items:center;gap:10px;
  background:var(--surface);border:1px solid var(--hairline);border-radius:12px;
  padding:12px 14px;font-size:15px;font-weight:600;color:var(--ink);min-width:0;
}
.pair-link:hover{border-color:var(--accent);text-decoration:none}
.pair-link .delta{color:var(--muted);font-size:13px;font-weight:600;white-space:nowrap;font-variant-numeric:tabular-nums}

/* ---- feature list ---- */
.pair{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:40px;align-items:start}
@media (max-width:860px){.pair{grid-template-columns:minmax(0,1fr)}}
.feat{display:flex;gap:14px;padding-block:18px;border-bottom:1px solid var(--hairline)}
.feat:last-child{border-bottom:none}
.feat-num{font-size:13px;font-weight:800;color:var(--accent-text);background:var(--accent-soft);width:30px;height:30px;border-radius:9999px;display:flex;align-items:center;justify-content:center;flex:none}
.feat h3{font-size:19px}
.feat p{color:var(--muted);font-size:15px;margin-top:5px}

/* ---- footer ---- */
footer{margin-top:72px;border-top:1px solid var(--hairline);background:var(--canvas)}
.foot{display:flex;gap:32px;flex-wrap:wrap;padding-block:32px;justify-content:space-between}
.foot h4{font-size:11px;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);margin:0 0 10px;font-weight:700}
.foot ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:7px}
.foot a,.foot li{font-size:14px;font-weight:500;color:var(--ink)}
.foot-note{color:var(--muted);font-size:13px;max-width:34ch}

.toast{
  position:fixed;left:50%;transform:translateX(-50%);bottom:20px;
  background:var(--ink);color:var(--canvas);
  padding:11px 18px;border-radius:9999px;font-size:14px;font-weight:600;
  box-shadow:var(--shadow-card);z-index:60;
}
@media (prefers-reduced-motion: reduce){
  *{animation-duration:.001ms !important;transition-duration:.001ms !important}
}

/* ---- time zone change notice ---- */
.notice{
  margin-block:20px 0;
  background:var(--accent-soft);
  border:1px solid var(--hairline);
  border-radius:16px;
  padding:20px 24px;
}
.notice-body{max-width:72ch;display:flex;flex-direction:column;gap:8px}
.notice-tag{
  font-size:11px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;
  color:var(--accent-text);
}
.notice h2{font-size:20px;font-weight:700;line-height:1.3}
.notice p{color:var(--muted);font-size:15px}
.notice-link{font-size:15px;font-weight:700;color:var(--accent-text);align-self:start}

/* ---- overlap legend under the slider ---- */
.track-legend{display:flex;gap:16px;flex-wrap:wrap;margin:10px 0 8px;font-size:12px;color:var(--muted);font-weight:600}
.track-legend span{display:inline-flex;align-items:center;gap:6px}
.track-legend i{width:12px;height:12px;border-radius:4px;border:1px solid var(--hairline);flex:none}

/* ---- per-row status ---- */
.status{
  display:inline-flex;align-items:center;gap:5px;
  font-size:11px;font-weight:700;letter-spacing:.02em;
  border-radius:9999px;padding:2px 8px;white-space:nowrap;vertical-align:middle;
}
.status::before{content:"";width:7px;height:7px;border-radius:50%;background:currentColor;flex:none}
.status-work{background:var(--accent-soft);color:var(--accent-text)}
.status-awake{background:var(--surface-2);color:var(--muted)}
.status-sleep{background:var(--surface-2);color:var(--muted)}
.status-sleep::before{background:var(--faint)}
.track-summary{margin:0;font-size:14px;font-weight:600;color:var(--ink);line-height:1.5;max-width:70ch}

/* ---- city rows at phone width: time drops under the name ---- */
@media (max-width:480px){
  .city{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:6px 10px;align-items:start}
  .city-main{grid-column:1;grid-row:1}
  .city-time{grid-column:1;grid-row:2;text-align:left;display:flex;align-items:baseline;gap:10px;flex-wrap:wrap}
  .city-time .t{font-size:22px}
  .remove{grid-column:2;grid-row:1 / span 2;align-self:center}
}