:root{color-scheme:dark;--bg:#07111e;--panel:#0c1d2e;--line:#254052;--text:#edf5fb;--muted:#97b0c5;--gold:#ffd478;--north:#75dbc9;--south:#c2a5ff}
*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 60% 0,#15334a44,transparent 65%),var(--bg);color:var(--text);font:16px/1.6 system-ui,-apple-system,"Segoe UI","Noto Sans TC",sans-serif}button,input,select{font:inherit}button,a,select,input{-webkit-tap-highlight-color:transparent}button,select{color:inherit}button,a{touch-action:manipulation}a{color:var(--muted);text-underline-offset:4px}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible,select:focus-visible{outline:3px solid var(--gold);outline-offset:3px}.shell{max-width:1320px;padding:0 28px;margin:auto}.masthead{display:flex;gap:20px;align-items:center;justify-content:space-between;padding:24px 0;border-bottom:1px solid var(--line)}.home{text-decoration:none;font-weight:650}.masthead nav{display:flex;background:#0e2435;padding:4px;border:1px solid var(--line);border-radius:12px}.masthead nav a{padding:8px 20px;text-decoration:none;border-radius:8px;font-size:14px}.masthead nav a[aria-current]{background:#255169;color:#eefaff}.edition{font-size:12px;color:var(--muted)}.intro{padding:32px 0 24px}.eyebrow{margin:0;color:#85afc9;font-size:11px;font-weight:700;letter-spacing:.13em}.intro h1{margin:8px 0 10px;font-size:clamp(24px,3vw,38px);line-height:1.3;letter-spacing:-.03em}.intro p:last-child{color:var(--muted);margin:0;font-size:15px}.mobile-break{display:none}.time-panel,.globe-panel,.position-panel,.comparison{background:linear-gradient(135deg,#102438,#0a1929);border:1px solid var(--line);border-radius:18px}.time-panel{padding:18px 24px 12px;margin-bottom:18px}.time-head{display:flex;justify-content:space-between;align-items:center;gap:12px}.time-head strong{font-size:24px;font-variant-numeric:tabular-nums;letter-spacing:-.03em}.time-head span{margin-left:14px;color:var(--gold);font-size:14px}.play-controls{display:flex;align-items:center;gap:12px}.play-controls button{min-height:42px;border:1px solid #caab60;background:#f5d1811c;color:#ffe6aa;padding:7px 17px;border-radius:10px;font-weight:700}.play-controls label{font-size:12px;color:var(--muted)}select{background:#162f42;border:1px solid var(--line);border-radius:7px;padding:5px}.seasons{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin:15px 0 12px}.seasons button{border:1px solid var(--line);background:#0b1b2d;color:var(--muted);border-radius:9px;min-height:42px;padding:6px}.seasons small{margin-left:7px;color:#7796ae;font-size:11px}.seasons button[aria-pressed=true]{color:#ffe6aa;border-color:#ab8944;background:#80612129}.timeline-label{font-size:11px;color:var(--muted)}#focusDay{display:block;width:100%;margin:6px 0 0;accent-color:var(--gold);cursor:ew-resize}.month-labels{display:flex;justify-content:space-between;font-size:10px;color:#638097}.focus-grid{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:18px}.globe-panel{min-width:0;overflow:hidden}.panel-top{display:flex;align-items:center;justify-content:space-between;padding:20px 24px 12px;gap:12px}.panel-top h2,.section-heading h2{font-size:19px;line-height:1.4;margin:4px 0 0}.panel-top button{padding:6px 12px;border:1px solid var(--line);border-radius:8px;background:#193449;color:#c1dbe9;font-size:12px;white-space:nowrap;min-height:38px}#earthCanvas{display:block;width:100%;height:440px}.legend{display:flex;justify-content:center;gap:22px;padding:8px 16px;font-size:12px;color:var(--muted)}.legend span{display:flex;align-items:center;gap:7px}.legend i{display:inline-block;width:7px;height:7px;border-radius:50%}.sun-dot{background:var(--gold)}.north-dot{background:var(--north)}.south-dot{background:var(--south)}.view-note{margin:0;padding:8px 22px 18px;color:#7695ad;font-size:11px;text-align:center}.position-panel{padding:22px 24px;min-width:0}.position-panel h2{font-size:23px;margin:7px 0 0}.latitude-value{font-size:38px;font-weight:750;letter-spacing:-.04em;color:var(--gold);font-variant-numeric:tabular-nums}.migration{font-size:12px;color:var(--muted);min-height:40px;margin:8px 0}.latitude-ruler{height:136px;margin:22px 0 28px;position:relative}.ruler-track{position:absolute;top:5px;bottom:5px;width:3px;left:12px;border-radius:3px;background:linear-gradient(var(--north),#8496ad,var(--south))}.ruler-dot{position:absolute;top:0;left:50%;width:13px;height:13px;transform:translate(-50%,-50%);border:2px solid #fff0bc;border-radius:50%;background:var(--gold);box-shadow:0 0 15px #ffd47877}.tick{position:absolute;left:30px;font-size:12px;line-height:1.4;color:var(--muted);width:calc(100% - 30px)}.tick b{display:block;font-size:10px;font-weight:500}.tick-n{top:-4px;color:var(--north)}.tick-e{top:54px}.tick-s{bottom:-5px;color:var(--south)}.orbit-inset{border-top:1px solid var(--line);padding-top:12px}.orbit-inset p{margin:0;color:var(--muted);font-size:11px}.orbit-inset canvas{width:100%;height:142px;display:block}.orbit-inset a{font-size:11px}.comparison-section{margin:26px 0 14px}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:15px;margin-bottom:14px}.section-heading>span{color:var(--muted);font-size:12px;white-space:nowrap}.comparison-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.comparison{overflow:hidden;padding:16px 20px 12px}.comparison-title{display:flex;align-items:baseline;justify-content:space-between}.comparison h3{font-size:16px;margin:0}.comparison-title strong{font-size:24px;font-variant-numeric:tabular-nums}.north .comparison-title{color:var(--north)}.south .comparison-title{color:var(--south)}.comparison canvas{display:block;width:100%;height:160px}.comparison p{display:flex;align-items:center;gap:8px;margin:0;font-size:12px}.comparison b{font-size:17px;color:var(--gold);font-variant-numeric:tabular-nums}.comparison span{color:var(--muted)}.comparison em{font-style:normal;margin-left:auto;font-size:11px;color:#becddb}.comparison-note{font-size:11px;color:#7895ac;margin:12px 2px}.model-details{font-size:12px;color:var(--muted);border-top:1px solid var(--line);margin:26px 0 0;padding:18px 2px}.model-details summary{cursor:pointer}.model-details p{max-width:1000px;line-height:1.8}.model-details a{color:#a0cadf}footer{text-align:center;color:#5f7d96;font-size:11px;padding:22px 0 32px}
@media(min-width:1200px){#earthCanvas{height:470px}}@media(max-width:980px){.shell{padding:0 18px}.focus-grid{grid-template-columns:minmax(0,1fr) 220px}.position-panel{padding:20px 18px}.panel-top{padding:18px}.panel-top h2{font-size:17px}.latitude-value{font-size:34px}.edition{display:none}.comparison em{display:none}}
@media(max-width:740px){.shell{padding:0 12px}.masthead{padding:16px 0;gap:10px}.masthead nav a{padding:7px 12px;font-size:12px}.home{font-size:12px}.intro{padding:24px 2px 18px}.intro p:last-child{font-size:12px}.mobile-break{display:block}.time-panel{padding:14px 12px 10px}.time-head{align-items:flex-start}.time-head strong{font-size:20px;display:block}.time-head span{font-size:11px;margin-left:0}.play-controls{align-items:end;flex-direction:column;gap:5px}.play-controls button{padding:6px 10px;font-size:12px;min-height:36px}.play-controls label{font-size:10px}.seasons{margin-top:12px;gap:6px}.seasons button{font-size:13px}.seasons small{display:block;margin-left:0}.focus-grid{grid-template-columns:1fr;gap:12px}.position-panel{display:grid;grid-template-columns:1fr 1fr;padding:16px 18px;column-gap:20px}.position-panel>.eyebrow,.position-panel>h2,.position-panel>.latitude-value,.position-panel>.migration{grid-column:1}.position-panel>.latitude-ruler{grid-column:2;grid-row:1/5;margin:12px 0;height:132px}.position-panel>.orbit-inset{grid-column:1/-1;margin-top:8px;display:grid;grid-template-columns:1fr 1fr;align-items:center}.orbit-inset canvas{grid-column:2;grid-row:1/3;height:105px}.orbit-inset p{font-size:10px}.orbit-inset a{align-self:start}.latitude-value{font-size:30px}.position-panel h2{font-size:20px}.migration{font-size:11px;min-height:0}.legend{gap:12px;font-size:10px}.panel-top h2{font-size:17px}.panel-top .eyebrow{font-size:9px}.panel-top button{font-size:11px;padding:5px 8px}.view-note{padding:6px 14px 14px;font-size:10px}#earthCanvas{height:360px}.section-heading{display:block}.section-heading h2{font-size:17px}.section-heading>span{display:block;margin-top:5px;font-size:11px}.comparison-grid{gap:10px}.comparison{padding:12px 10px}.comparison h3{font-size:13px}.comparison-title strong{font-size:20px}.comparison-title{display:block}.comparison canvas{height:148px}.comparison p{display:block}.comparison b{font-size:16px}.comparison span{display:block;font-size:10px}.comparison-note{font-size:10px}.eyebrow{font-size:10px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}