/* cometa-halley: a night sky and an almanac page; ice blue for the comet, amber for the Sun, coral for the reader */
@font-face{font-family:"Source Serif 4";font-weight:200 900;font-style:normal;font-display:swap;src:url("fonts/SourceSerif4-400-latin.woff2") format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Source Serif 4";font-weight:200 900;font-style:normal;font-display:swap;src:url("fonts/SourceSerif4-400-latin-ext.woff2") format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}
@font-face{font-family:"IBM Plex Sans";font-weight:100 700;font-style:normal;font-display:swap;src:url("fonts/IBMPlexSans-400-latin.woff2") format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"IBM Plex Sans";font-weight:100 700;font-style:normal;font-display:swap;src:url("fonts/IBMPlexSans-400-latin-ext.woff2") format("woff2");unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF}

:root{
  --bg:#f4f0e6;--surface:#fbf8f1;--ink:#141d2e;--ink-soft:#3d4860;--line:#cdc8b9;--line-soft:#e0dccf;
  --comet:#1d3f7a;--comet-rgb:29,63,122;--sun:#a85f00;--sun-rgb:224,150,30;--you:#872510;--ring-rgb:92,102,128;--on-comet:#fbf8f1;
  --serif:"Source Serif 4",Georgia,serif;--sans:"IBM Plex Sans",system-ui,sans-serif;
  --top:44px;--col:400px;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#080d18;--surface:#101829;--ink:#eef3fa;--ink-soft:#b4c0d2;--line:#2c3852;--line-soft:#1b2437;
  --comet:#cfe9ff;--comet-rgb:207,233,255;--sun:#ffcf6b;--sun-rgb:255,207,107;--you:#ffb4a1;--ring-rgb:150,170,205;--on-comet:#080d18;
}}
:root[data-theme="dark"]{
  --bg:#080d18;--surface:#101829;--ink:#eef3fa;--ink-soft:#b4c0d2;--line:#2c3852;--line-soft:#1b2437;
  --comet:#cfe9ff;--comet-rgb:207,233,255;--sun:#ffcf6b;--sun-rgb:255,207,107;--you:#ffb4a1;--ring-rgb:150,170,205;--on-comet:#080d18;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
svg[hidden]{display:none}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{margin:0;background:var(--bg);color:var(--ink);font:400 18px/1.6 var(--serif)}
a{color:var(--comet);text-underline-offset:.16em}
a:focus-visible,button:focus-visible,select:focus-visible,input:focus-visible{outline:2px solid var(--comet);outline-offset:2px}
h1,h2,h3{font-family:var(--serif);font-weight:650;line-height:1.14;letter-spacing:-.01em;margin:0}
b{font-weight:650}
.skip{position:absolute;left:-999px;top:0;background:var(--surface);color:var(--ink);padding:.5rem .8rem;z-index:60}
.skip:focus{left:8px;top:8px}

/* top bar */
.topbar{position:sticky;top:0;z-index:40;height:var(--top);display:flex;align-items:center;gap:14px;padding:0 16px;background:var(--bg);border-bottom:1px solid var(--line-soft);font:500 14px/1 var(--sans);white-space:nowrap}
.topbar a{color:var(--ink);text-decoration:none}
.topbar .home{display:flex;align-items:center;gap:7px;font-weight:600}
.home-ico{color:var(--comet);flex:none}
.topnav{display:flex;gap:16px;overflow:hidden}
.topnav a{color:var(--ink-soft)}
.topnav a:hover,.topnav a[aria-current]{color:var(--ink)}
.spacer{flex:1}
.lang-switch{border:1px solid var(--line);border-radius:999px;padding:6px 10px;font-weight:600;font-size:12px}
.icon-btn{width:32px;height:32px;display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;background:none;color:var(--ink);cursor:pointer;padding:0}
.icon-btn svg{display:block}
.icon-btn svg[hidden]{display:none}
.progress{position:absolute;left:0;right:0;bottom:-1px;height:1px;pointer-events:none}
.progress span{opacity:0;position:absolute;left:0;top:-4px;width:26px;height:8px;border-radius:999px;background:linear-gradient(90deg,rgba(var(--comet-rgb),0),var(--comet) 78%);will-change:transform}
@media (max-width:760px){.topnav{display:none}}

/* reading rail */
.rail{position:fixed;right:10px;top:50%;transform:translateY(-50%);z-index:30;display:none;flex-direction:column;gap:9px;padding:8px 5px;border-radius:999px;background:color-mix(in srgb,var(--bg) 82%,transparent)}
.rail a{position:relative;display:block;width:9px;height:9px;border-radius:50%;border:1.5px solid var(--ink-soft)}
.rail a[aria-current]{background:var(--comet);border-color:var(--comet)}
.rail a span{position:absolute;right:18px;top:50%;transform:translateY(-50%);white-space:nowrap;font:500 12px/1 var(--sans);color:var(--ink);background:var(--surface);border:1px solid var(--line-soft);padding:5px 8px;border-radius:6px;opacity:0;pointer-events:none}
.rail a:hover span,.rail a:focus-visible span{opacity:1}
@media (min-width:1180px){.rail{display:flex}}
@media print{.rail,.topbar,.share-row,.stage,.hudwrap{display:none}}

/* hero */
.hero{max-width:820px;margin:0 auto;padding:34px 20px 44px}
.kicker{font:600 13px/1.2 var(--sans);letter-spacing:.09em;text-transform:uppercase;color:var(--comet);margin:0 0 12px}
h1{font-size:clamp(2rem,5.4vw,3.35rem)}
.deck{font-size:1.16rem;color:var(--ink-soft);margin:18px 0 0}
.now{margin:22px 0 0;padding:14px 16px;border-left:3px solid var(--sun);background:var(--surface);font:400 1.02rem/1.5 var(--sans)}
.now b{font-family:var(--serif);font-size:1.3em}
.opened{margin:14px 0 0;font:500 .98rem/1.45 var(--sans);color:var(--you)}
.jump{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0 0}
.btn{display:inline-block;font:600 .95rem/1.2 var(--sans);padding:11px 16px;border-radius:999px;background:var(--comet);color:var(--on-comet);text-decoration:none;border:1px solid var(--comet)}
.btn.ghost{background:none;color:var(--ink);border-color:var(--line)}

/* the scroll story: plain stacked cards until the positions load */
.story{position:relative;max-width:720px;margin:0 auto;padding:0 20px}
.stage,.hudwrap{display:none}
.story.is-live .hudwrap{display:block;position:sticky;top:var(--top);height:0;z-index:3}
.steps{display:grid;gap:18px}
.step{background:var(--surface);border:1px solid var(--line-soft);border-radius:12px;padding:16px 18px 14px}
.step .when{font:600 12.5px/1.2 var(--sans);letter-spacing:.07em;text-transform:uppercase;color:var(--comet);margin:0 0 6px}
.step h3{font-size:1.28rem;margin:0 0 6px}
.step p{margin:0 0 8px;font-size:1rem;line-height:1.5}
@media (max-width:959px){.step p{font-size:.95rem;line-height:1.45}.step h3{font-size:1.16rem}.step{padding:13px 15px 10px}}
.step-you{border-color:var(--you)}
.step-you .when{color:var(--you)}
.pic{margin:10px 0 0}
.pic img{display:block;width:100%;height:auto;border-radius:6px;border:1px solid var(--line-soft)}
.pic figcaption{font:400 .82rem/1.4 var(--sans);color:var(--ink-soft);margin-top:6px}
.pic .cr{display:block;opacity:.92}
.pic-step img{max-height:190px;object-fit:cover;object-position:50% 40%}
.story.is-live{max-width:none;padding:0}
.story.is-live .stage{display:block;position:sticky;top:var(--top);height:calc(100vh - var(--top));height:calc(100svh - var(--top));overflow:hidden}
.story.is-live .steps{display:block;position:absolute;inset:0;pointer-events:none;z-index:2}
.story.is-live .step{position:absolute;left:14px;right:14px;max-width:440px;margin:0 auto;pointer-events:auto;background:color-mix(in srgb,var(--surface) 90%,transparent);-webkit-backdrop-filter:blur(7px);backdrop-filter:blur(7px);border-color:var(--line)}
#sky{position:absolute;inset:0;width:100%;height:100%;display:block}
.hud{position:absolute;left:0;top:0;right:0;z-index:3;padding:10px 16px 22px;pointer-events:none;background:linear-gradient(var(--bg) 62%,rgba(0,0,0,0))}
.hud p{margin:0}
.hud-date{font:650 clamp(1.45rem,5.6vw,2.3rem)/1.1 var(--serif);letter-spacing:-.01em}
.hud-nums{display:flex;flex-wrap:wrap;gap:4px 16px;font:500 .92rem/1.35 var(--sans);color:var(--ink-soft);margin-top:5px!important}
.hud-nums b{color:var(--ink);font-weight:600;font-variant-numeric:tabular-nums}
.hud-pace{display:inline-block;margin-top:7px!important;font:600 11.5px/1 var(--sans);letter-spacing:.06em;text-transform:uppercase;color:var(--comet);border:1px solid var(--line);border-radius:999px;padding:5px 9px;background:color-mix(in srgb,var(--bg) 70%,transparent)}
@media (min-width:960px){
  .story.is-live .stage{margin-left:calc(var(--col) + 56px)}
  .story.is-live .step{left:28px;right:auto;width:var(--col);max-width:none;margin:0;background:var(--surface);-webkit-backdrop-filter:none;backdrop-filter:none}
  .hud{left:calc(var(--col) + 56px);padding:16px 22px 22px;background:none}
}

/* sections */
.sec{max-width:720px;margin:0 auto;padding:64px 20px 0;scroll-margin-top:var(--top)}
.sec-wide{max-width:1040px}
.sec h2{font-size:clamp(1.55rem,3.6vw,2.1rem);margin-bottom:14px}
.sec h3{font-size:1.22rem;margin:28px 0 8px}
.sec p{margin:0 0 14px}
.hero,.story{scroll-margin-top:var(--top)}

/* the reader's year */
.pick{display:flex;flex-wrap:wrap;gap:10px 12px;align-items:end;margin:18px 0 6px}
.pick label{display:grid;gap:5px;font:600 12.5px/1.2 var(--sans);letter-spacing:.04em;color:var(--ink-soft)}
select{font:500 1.05rem/1.2 var(--sans);color:var(--ink);background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:10px 12px;min-height:44px}
.reset,.more{font:600 .92rem/1.2 var(--sans);color:var(--ink);background:none;border:1px solid var(--line);border-radius:999px;padding:11px 15px;min-height:44px;cursor:pointer}
.result{margin:18px 0 6px;padding:20px 20px 16px;background:var(--surface);border:1px solid var(--you);border-radius:14px}
.result .kicker{color:var(--you);margin-bottom:8px}
.result h3{font-size:clamp(1.35rem,3.6vw,1.8rem);margin:0 0 12px}
.result p{font-size:1.02rem;margin:0 0 10px}
#you-sky{display:block;width:100%;height:170px;margin:8px 0 12px}
.share-row{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin:16px 0 0;font:500 .9rem/1.2 var(--sans);color:var(--ink-soft)}
.share-row a,.share-row button{width:40px;height:40px;display:grid;place-items:center;border:1px solid var(--line-soft);border-radius:50%;background:none;color:var(--ink);cursor:pointer;padding:0}
.share-row a:hover,.share-row button:hover,.share-row a:focus-visible,.share-row button:focus-visible{color:var(--comet);border-color:var(--comet)}
.share-row [role=status]{flex-basis:100%;min-height:1.2em}
@media (pointer:coarse){.share-row a,.share-row button{width:44px;height:44px}}

/* the orbit without the text */
.pl-ctl{display:flex;flex-wrap:wrap;align-items:center;gap:12px 18px;margin:14px 0 8px}
.play{display:inline-flex;align-items:center;gap:8px;font:600 .95rem/1.2 var(--sans);padding:11px 16px;min-height:44px;border-radius:999px;background:var(--comet);color:var(--on-comet);border:1px solid var(--comet);cursor:pointer}
.play .ic-pause{display:none}
.play[data-on] .ic-pause{display:inline}
.play[data-on] .ic-play{display:none}
.pl-year{display:flex;align-items:center;gap:10px;flex:1;min-width:230px;font:600 12.5px/1.2 var(--sans);color:var(--ink-soft)}
.pl-year input{flex:1;accent-color:var(--comet);min-height:32px}
.pl-read{font:500 1rem/1.4 var(--sans);font-variant-numeric:tabular-nums;margin:0 0 10px!important;min-height:1.4em}
.pl-wrap{border:1px solid var(--line-soft);border-radius:14px;background:var(--surface);overflow:hidden}
#pl-sky{display:block;width:100%;height:min(62vh,560px)}

/* tables and small charts */
.tbl{width:100%;border-collapse:collapse;font:400 .95rem/1.35 var(--sans);margin:14px 0 4px}
.tbl th,.tbl td{text-align:left;padding:8px 10px 8px 0;border-bottom:1px solid var(--line-soft);vertical-align:top}
.tbl thead th{font-weight:600;font-size:.82rem;letter-spacing:.03em;color:var(--ink-soft)}
.tbl tbody th{font-weight:600}
#ret-table tbody th{white-space:nowrap}
@media (max-width:520px){.tbl{font-size:.88rem}.tbl th,.tbl td{padding-right:8px}}
.tbl td{font-variant-numeric:tabular-nums}
.more{margin-top:12px}
.zonefig{margin:22px 0}
.zonefig svg{display:block;width:100%;height:46px;border-radius:6px}
.z0{fill:var(--sun)}.z1{fill:color-mix(in srgb,var(--sun) 72%,var(--comet))}.z2{fill:color-mix(in srgb,var(--sun) 42%,var(--comet))}
.z3{fill:color-mix(in srgb,var(--comet) 38%,var(--bg))}.z4{fill:color-mix(in srgb,var(--comet) 56%,var(--bg))}.z5{fill:color-mix(in srgb,var(--comet) 76%,var(--bg))}.z6{fill:var(--comet)}
.sw{display:inline-block;width:11px;height:11px;border-radius:3px;margin-right:8px;vertical-align:-1px}
i.z0{background:var(--sun)}i.z1{background:color-mix(in srgb,var(--sun) 72%,var(--comet))}i.z2{background:color-mix(in srgb,var(--sun) 42%,var(--comet))}
i.z3{background:color-mix(in srgb,var(--comet) 38%,var(--bg))}i.z4{background:color-mix(in srgb,var(--comet) 56%,var(--bg))}i.z5{background:color-mix(in srgb,var(--comet) 76%,var(--bg))}i.z6{background:var(--comet)}
.ivfig{margin:22px 0;overflow-x:auto}
.ivfig svg{display:block;width:100%;min-width:640px;height:auto}
.ivfig figcaption{font:400 .82rem/1.4 var(--sans);color:var(--ink-soft);margin-top:6px}
.ivfig .grid{stroke:var(--line-soft);stroke-width:1}
.ivfig .ax{fill:var(--ink-soft);font:500 19px var(--sans)}
.ivfig .lab{fill:var(--ink);font:600 19px var(--sans)}
.ivfig .ivl{fill:none;stroke:var(--comet);stroke-width:1.5;opacity:.45}
.ivfig .ivd{fill:var(--comet)}
.ivfig .ivd.ext{fill:var(--sun)}
.ivfig .ivd.fut{fill:var(--bg);stroke:var(--comet);stroke-width:2.5}
.item{display:grid;gap:14px;margin:30px 0 0;padding-top:22px;border-top:1px solid var(--line-soft)}
.item h3{margin:0 0 8px}
.item .pic{margin:0}
@media (min-width:700px){.item{grid-template-columns:230px 1fr;gap:22px}.item.item-text{grid-template-columns:1fr}}
.src{padding-left:1.1em;font:400 .95rem/1.5 var(--sans)}
.src li{margin-bottom:6px}

.foot{max-width:720px;margin:72px auto 0;padding:22px 20px 44px;border-top:1px solid var(--line-soft);display:flex;flex-wrap:wrap;gap:8px 20px;font:400 .88rem/1.4 var(--sans);color:var(--ink-soft)}
.foot a{color:var(--ink)}
.d-page{max-width:760px;margin:0 auto;padding:40px 20px}
.d-page h1{font-size:clamp(1.6rem,4vw,2.3rem);margin-bottom:18px}
.d-page img{display:block;width:100%;height:auto;border-radius:10px;margin:0 0 18px}