:root{
  --paper:#f4f2ec; --ink:#101419; --muted:#626970; --rule:#cbc7bc; --panel:#ebe8df;
  --space:#0c1118; --space2:#151c25; --accent:#ad4327; --blue:#3e6f91; --yellow:#d29b42;
  --max:1440px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.45;overflow-x:hidden}
a{color:inherit}
button,input{font:inherit}
.wrap{max-width:var(--max);margin:auto;padding:0 28px}
header{position:sticky;top:0;z-index:20;background:rgba(244,242,236,.96);backdrop-filter:blur(10px);border-bottom:1px solid var(--rule)}
.header-row{height:66px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:24px}
.brand{font:700 17px/1.1 ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.04em;text-decoration:none;display:block}
.brand small{display:block;color:var(--muted);font:500 10px/1.3 ui-monospace,SFMono-Regular,Menlo,monospace;margin-top:4px;letter-spacing:.08em}
nav{display:flex;gap:18px;font-size:13px;align-items:center}
nav a{text-decoration:none;border-bottom:1px solid transparent;padding:23px 0 20px;white-space:nowrap}
nav a:hover{border-color:var(--ink)}
.nav-mobile{display:none}
.utility{justify-self:end;font-size:12px;color:var(--muted)}

/* Navigation Dropdowns */
.nav-dropdown{position:relative}
.nav-drop-btn{background:none;border:none;cursor:pointer;font-size:13px;padding:23px 0 20px;display:inline-flex;align-items:center;gap:4px;color:var(--ink);border-bottom:1px solid transparent}
.nav-drop-btn:hover,.nav-dropdown:hover .nav-drop-btn{border-color:var(--ink)}
.nav-drop-btn .caret{font-size:10px;color:var(--muted);transition:transform .2s ease}
.nav-dropdown:hover .nav-drop-btn .caret{transform:rotate(180deg)}
.nav-drop-menu{position:absolute;top:100%;left:-12px;background:rgba(244,242,236,.98);border:1px solid var(--rule);min-width:260px;box-shadow:0 8px 24px rgba(0,0,0,.08);backdrop-filter:blur(10px);display:none;padding:8px 0;z-index:30;border-radius:0 0 4px 4px}
.nav-dropdown:hover .nav-drop-menu,.nav-dropdown:focus-within .nav-drop-menu{display:block}
.nav-drop-menu a{display:block;padding:8px 16px;text-decoration:none;border-bottom:none;white-space:normal;line-height:1.25}
.nav-drop-menu a:hover{background:rgba(0,0,0,.04)}
.nav-drop-menu a b{display:block;font-size:12px;font-weight:600;color:var(--ink)}
.nav-drop-menu a span{display:block;font-size:10px;color:var(--muted);margin-top:2px}

/* Search Trigger & Search Modal */
.search-trigger{background:rgba(0,0,0,.04);border:1px solid var(--rule);border-radius:4px;padding:6px 12px;cursor:pointer;font-size:12px;font-weight:500;display:inline-flex;align-items:center;gap:6px;color:var(--ink);transition:all .15s ease}
.search-trigger:hover{background:rgba(0,0,0,.08);border-color:var(--ink)}
.search-trigger kbd{background:#fff;border:1px solid var(--rule);border-radius:3px;padding:1px 5px;font-size:10px;font-family:monospace;color:var(--muted)}
.search-trigger-mobile{background:rgba(0,0,0,.04);border:1px solid var(--rule);border-radius:4px;padding:4px 8px;font-size:12px;font-weight:600;cursor:pointer}

.search-modal-backdrop{position:fixed;inset:0;background:rgba(12,17,24,.6);backdrop-filter:blur(4px);z-index:100;display:flex;align-items:flex-start;justify-content:center;padding-top:10vh}
.search-modal-backdrop[hidden]{display:none}
.search-modal{background:var(--paper);border:1px solid var(--rule);width:90%;max-width:640px;border-radius:6px;box-shadow:0 16px 40px rgba(0,0,0,.2);overflow:hidden;animation:modalPop .15s ease-out}
@keyframes modalPop{from{opacity:0;transform:scale(.98) translateY(-8px)}to{opacity:1;transform:scale(1) translateY(0)}}
.search-box-row{display:flex;align-items:center;padding:14px 18px;border-bottom:1px solid var(--rule);gap:12px;background:#fff}
.search-modal-icon{font-size:16px;opacity:.6}
.search-box-row input{flex:1;border:none;outline:none;font-size:15px;background:transparent;color:var(--ink)}
.search-modal-close{background:none;border:none;font-size:16px;cursor:pointer;color:var(--muted);padding:4px}
.search-modal-close:hover{color:var(--ink)}
.search-results{max-height:60vh;overflow-y:auto;padding:8px}
.search-hint{padding:16px;text-align:center;font-size:12px;color:var(--muted)}
.search-hint kbd{background:#eee;padding:2px 6px;border-radius:3px;border:1px solid #ccc;font-size:10px}
.search-empty{padding:24px;text-align:center;font-size:13px;color:var(--muted)}
.search-item{display:block;padding:12px 14px;border-radius:4px;text-decoration:none;margin-bottom:4px;transition:background .15s ease}
.search-item:hover,.search-item[data-active="1"]{background:rgba(0,0,0,.05)}
.search-item-kicker{font:600 10px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.08em;text-transform:uppercase;color:var(--accent)}
.search-item-title{font-size:14px;font-weight:600;color:var(--ink);margin:3px 0}
.search-item-desc{font-size:11px;color:var(--muted);line-height:1.35}

/* Breadcrumbs */
.breadcrumb-wrap{padding:14px 0 0;font:500 11px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--muted);display:flex;align-items:center;gap:8px}
.breadcrumb-wrap a{text-decoration:none;color:inherit}
.breadcrumb-wrap a:hover{color:var(--ink);text-decoration:underline}
.breadcrumb-sep{opacity:.4}
.breadcrumb-current{color:var(--ink);font-weight:600}
.hero{border-bottom:1px solid var(--rule)}
.hero-grid{display:grid;grid-template-columns:minmax(320px,.78fr) minmax(580px,1.42fr);min-height:620px}
.intro{padding:78px 52px 70px 0;display:flex;flex-direction:column;justify-content:space-between;border-right:1px solid var(--rule)}
.kicker{font:600 11px/1.3 ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.12em;color:var(--accent);text-transform:uppercase;margin-bottom:18px}
h1{font:600 clamp(46px,5.4vw,82px)/.96 Georgia,"Times New Roman",serif;letter-spacing:-.045em;margin:0 0 28px;max-width:720px}
.lead{font-size:18px;max-width:580px;color:#3b4146;margin:0 0 34px}
.intro-note{border-top:1px solid var(--rule);padding-top:20px;display:grid;grid-template-columns:92px 1fr;gap:16px;font-size:12px;color:var(--muted)}
.intro-note strong{color:var(--ink);font-weight:650}
.scene-shell{position:relative;background:var(--space);min-height:620px;overflow:hidden;color:#f4f6f8}
#threeCanvas{position:absolute;inset:0;width:100%;height:100%;display:block;z-index:2;touch-action:none}
#sceneFallback{position:absolute;inset:0;overflow:hidden;z-index:1;background:radial-gradient(circle at 45% 42%,#253040 0,#121821 42%,#090e14 100%)}
#sceneFallback:before{content:"";position:absolute;inset:0;background-image:radial-gradient(#fff 0.6px,transparent 0.7px);background-size:56px 56px;opacity:.18}
.sun{position:absolute;width:126px;height:126px;border-radius:50%;left:46%;top:41%;transform:translate(-50%,-50%);background:radial-gradient(circle at 38% 35%,#fff3b5 0,#f3b449 28%,#c96927 58%,#9e351d 100%);box-shadow:0 0 70px rgba(240,152,53,.35)}
.orbit{position:absolute;left:46%;top:41%;border:1px solid rgba(255,255,255,.17);border-radius:50%;transform:translate(-50%,-50%) rotate(-8deg)}
.o1{width:220px;height:104px}.o2{width:320px;height:152px}.o3{width:430px;height:204px}.o4{width:560px;height:264px}.o5{width:760px;height:356px}
.p{position:absolute;border-radius:50%;box-shadow:inset -9px -10px 20px rgba(0,0,0,.38)}
.earth{width:34px;height:34px;left:66%;top:40%;background:radial-gradient(circle at 35% 32%,#8ebad1,#3e7597 47%,#315240)}
.mars{width:27px;height:27px;left:28%;top:53%;background:#a64f37}
.jupiter{width:82px;height:82px;left:74%;top:59%;background:repeating-linear-gradient(0deg,#d2b38b 0 9px,#b77d62 9px 16px,#ddc5a0 16px 24px)}
.saturn{width:68px;height:68px;left:16%;top:26%;background:#cdb98f}.saturn:after{content:"";position:absolute;width:115px;height:30px;border:6px solid #b6a27d;border-radius:50%;left:50%;top:50%;transform:translate(-50%,-50%) rotate(-14deg);opacity:.75}
.scene-top{position:absolute;z-index:4;left:22px;right:22px;top:20px;display:flex;justify-content:space-between;gap:16px;pointer-events:none}
.scene-label{font:600 11px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.1em;text-transform:uppercase}
.scene-mode{font:500 10px ui-monospace,SFMono-Regular,Menlo,monospace;color:#b9c0c7;text-align:right}
.scene-help{position:absolute;z-index:4;left:22px;bottom:18px;font-size:11px;color:#bfc6cc;max-width:360px;pointer-events:none}
.scene-panel{position:absolute;z-index:5;right:18px;bottom:18px;width:248px;background:rgba(10,14,20,.86);border:1px solid rgba(255,255,255,.18);padding:15px 16px 14px;backdrop-filter:blur(10px)}
.scene-panel .eyebrow{font:600 9px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.12em;text-transform:uppercase;color:#aeb8c2;margin-bottom:8px}
.scene-panel .panel-title{font:600 24px Georgia,serif;margin:0 0 6px}
.scene-panel p{font-size:11px;line-height:1.45;color:#c6ccd1;margin:0 0 10px}
.scene-panel dl{display:grid;grid-template-columns:1fr auto;gap:5px 10px;margin:0;font-size:10px;border-top:1px solid rgba(255,255,255,.14);padding-top:9px}
.scene-panel dt{color:#9ea8b2}.scene-panel dd{margin:0}
.verify-line{margin:8px 0 0;font-size:9px;color:#8b939b}.verify-line a{color:#a9c2d6}
.scene-controls{position:absolute;z-index:5;left:22px;top:56px;display:flex;flex-wrap:wrap;gap:6px;max-width:440px}
.scene-controls button{background:rgba(12,17,24,.75);color:#e9edf0;border:1px solid rgba(255,255,255,.25);padding:6px 9px;font-size:10px;cursor:pointer;border-radius:2px;transition:all .15s ease}
.scene-controls button:hover,.scene-controls button.active{background:#eae8e1;color:#111;border-color:#eae8e1;font-weight:600}
.planet-quick-bar{display:flex;gap:4px;flex-wrap:wrap;margin-top:2px}
.planet-quick-bar button{font-size:9px;padding:4px 7px;background:rgba(20,28,38,.8);border:1px solid rgba(255,255,255,.18);color:#ccd3db}
.planet-quick-bar button:hover,.planet-quick-bar button.active{background:#3e6f91;color:#fff;border-color:#5a8fae}
#sceneTooltip{position:absolute;z-index:6;pointer-events:none;background:rgba(16,20,25,.92);color:#f4f2ec;padding:4px 8px;font:600 10px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.05em;border:1px solid rgba(255,255,255,.3);border-radius:3px;transform:translate(-50%,-130%);display:none;white-space:nowrap;box-shadow:0 4px 12px rgba(0,0,0,.4)}

.section{padding:72px 0;border-bottom:1px solid var(--rule)}
.section-head{display:grid;grid-template-columns:260px 1fr;gap:42px;margin-bottom:38px}
.section-id{font:600 11px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--accent);letter-spacing:.1em;text-transform:uppercase;padding-top:8px}
h2{font:600 clamp(32px,3.2vw,48px)/1.04 Georgia,serif;letter-spacing:-.03em;margin:0 0 10px}
.section-head p{margin:0;color:var(--muted);max-width:760px}
.learning-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:34px;border-top:1px solid var(--rule)}
.step{padding:24px 0 8px;min-height:210px;position:relative}
.step-no{font:600 11px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--accent);margin-bottom:46px}
.step h3{font:600 22px/1.1 Georgia,serif;margin:0 0 10px}.step p{font-size:13px;color:var(--muted);margin:0;max-width:330px}
.step .micro{position:absolute;right:22px;top:22px;width:86px;height:54px}
.scale-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:0;border:1px solid var(--rule);min-width:0}
.scale-viz{padding:34px 34px 30px;border-right:1px solid var(--rule);background:#ece9e1;display:flex;flex-direction:column;justify-content:space-between;min-width:0}
.scale-viz>div{min-width:0}
.scale-viz h3,.source-panel h3{font:600 24px Georgia,serif;margin:0 0 7px}.scale-viz p{font-size:12px;color:var(--muted);margin:0 0 20px}
.planets-row{display:flex;align-items:flex-end;gap:14px;min-height:235px;padding-bottom:20px;border-bottom:1px solid #aaa59a;overflow-x:auto}
.planet-item{display:flex;flex-direction:column;align-items:center;gap:9px;min-width:46px;font:500 9px ui-monospace,SFMono-Regular,Menlo,monospace;color:#53585c;cursor:pointer;padding:6px;border-radius:4px;transition:background .15s ease}
.planet-item:hover,.planet-item.active{background:rgba(0,0,0,.06);color:var(--ink)}
.planet-item.active .ball{outline:2px solid var(--accent);outline-offset:3px}
.ball{border-radius:50%;background:#777;flex:0 0 auto;box-shadow:inset -8px -9px 14px rgba(0,0,0,.25);transition:transform .2s ease}
.planet-item:hover .ball{transform:scale(1.05)}

/* Scale Lab Live Fact Box & Intuition Question */
.scale-fact-box{margin-top:20px;padding:16px 18px;background:#ded9cd;border-left:3px solid var(--accent);font-size:12px;line-height:1.45}
.scale-fact-box strong{font-family:Georgia,serif;font-size:16px;display:block;margin-bottom:4px;color:var(--ink)}
.source-panel .verify-line,.scale-viz>div>.verify-line{color:var(--muted)}.source-panel .verify-line a,.scale-viz>div>.verify-line a{color:inherit;border-bottom:1px solid #8d8980}
.scale-quiz{margin-top:28px;border-top:1px dashed var(--rule);padding-top:20px}
.scale-quiz-title{font:600 10px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.1em;color:var(--accent);text-transform:uppercase;margin-bottom:8px}
.scale-quiz p{margin:0 0 12px;font-size:13px;color:var(--ink);font-weight:500}
.quiz-options{display:flex;gap:8px;flex-wrap:wrap}
.quiz-options button{font:500 11px ui-monospace,SFMono-Regular,Menlo,monospace;padding:7px 12px;border:1px solid #9e9a8f;background:transparent;cursor:pointer;border-radius:3px}
.quiz-options button:hover{background:#d5cfbf}
.quiz-options button.correct{background:#315240;color:#fff;border-color:#315240}
.quiz-options button.wrong{background:var(--accent);color:#fff;border-color:var(--accent);opacity:.7}
.quiz-feedback{margin-top:10px;font-size:11px;color:#464a4e;display:none}
.quiz-retry{margin-top:12px;font:600 10px ui-monospace,SFMono-Regular,Menlo,monospace;padding:7px 12px;border:1px solid var(--accent);background:transparent;color:var(--accent);cursor:pointer;border-radius:3px}
.quiz-retry:hover{background:var(--accent);color:#fff}

.source-panel{padding:34px}
.source-panel ol{margin:20px 0 0;padding:0;list-style:none;border-top:1px solid var(--rule)}
.source-panel li{display:grid;grid-template-columns:28px 1fr auto;gap:13px;padding:16px 0;border-bottom:1px solid var(--rule);align-items:start}
.source-panel .num{font:600 10px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--accent);padding-top:3px}.source-panel b{font-size:13px}.source-panel span{display:block;font-size:11px;color:var(--muted);margin-top:3px}.source-panel a{font-size:11px;text-decoration:none;border-bottom:1px solid #8d8980;white-space:nowrap}
.truth-grid{display:grid;grid-template-columns:1fr 1fr 1fr;gap:20px}
.truth{border-top:2px solid var(--ink);padding:18px 0;cursor:pointer}.truth h3{font:600 20px Georgia,serif;margin:0 0 8px}.truth p{font-size:12px;color:var(--muted);margin:0}.truth code{font:600 10px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--accent)}
.truth-example{max-height:0;overflow:hidden;transition:max-height .25s ease,margin-top .25s ease;font-size:11px;color:var(--ink);background:#ece9e1;padding:0 12px;border-radius:3px}
.truth.open .truth-example{max-height:120px;margin-top:10px;padding:10px 12px}
.truth-hint{display:block;margin-top:10px;font:600 9px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.06em;color:var(--accent);text-transform:uppercase}
.truth-viz{width:100%;height:84px;margin-bottom:14px;background:#101419;border-radius:3px;overflow:hidden}
.truth-viz svg{width:100%;height:100%;display:block}
@keyframes scanSweep{0%{transform:translateX(-110%)}100%{transform:translateX(110%)}}
@keyframes orbitSpin{to{transform:rotate(360deg)}}
@keyframes pulseGlow{0%,100%{opacity:.45}50%{opacity:1}}
.viz-scan-line{animation:scanSweep 2.6s ease-in-out infinite}
.viz-orbit-group{transform-origin:50px 42px;animation:orbitSpin 5s linear infinite}
.viz-pulse{animation:pulseGlow 1.8s ease-in-out infinite}
.truth:hover .viz-orbit-group{animation-duration:1.6s}
.truth:hover .viz-scan-line{animation-duration:1s}
@media(prefers-reduced-motion:reduce){.viz-scan-line,.viz-orbit-group,.viz-pulse{animation:none}}
.table-scroll{width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}
.ref-table{width:100%;min-width:640px;border-collapse:collapse;border-top:2px solid var(--ink);font-size:12px}.ref-table th,.ref-table td{text-align:left;padding:14px 12px;border-bottom:1px solid var(--rule);vertical-align:top}.ref-table th{font:600 10px ui-monospace,SFMono-Regular,Menlo,monospace;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}.ref-table a{text-decoration:none;border-bottom:1px solid #8d8980}.tag{font:600 9px ui-monospace,SFMono-Regular,Menlo,monospace;text-transform:uppercase;letter-spacing:.05em;color:var(--accent)}

/* Editorial Ad Slot Styles */
.ad-slot-wrapper{max-width:var(--max);margin:36px auto;padding:18px 28px;background:rgba(235,232,223,.45);border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);display:flex;flex-direction:column;align-items:center;justify-content:center}
.ad-label{font:600 9px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.12em;color:var(--muted);text-transform:uppercase;margin-bottom:12px;display:block;text-align:center}

footer{padding:30px 0 48px;font-size:11px;color:var(--muted)}.footer-grid{display:grid;grid-template-columns:1fr 1fr;gap:30px}.footer-grid strong{color:var(--ink)}
@media(max-width:980px){.header-row{grid-template-columns:1fr auto}.header-row nav{display:none}.nav-mobile{display:flex;gap:18px;overflow-x:auto;-webkit-overflow-scrolling:touch;font-size:12px;padding:0 28px 12px;white-space:nowrap}.nav-mobile a{text-decoration:none;color:var(--muted);flex:0 0 auto}.nav-mobile a:hover{color:var(--ink)}.hero-grid{grid-template-columns:1fr}.intro{border-right:0;border-bottom:1px solid var(--rule);padding:44px 0}.scene-shell{min-height:520px}.learning-grid,.truth-grid{grid-template-columns:1fr}.scale-grid{grid-template-columns:1fr}.scale-viz{border-right:0;border-bottom:1px solid var(--rule)}.section-head{grid-template-columns:1fr;gap:10px}.section{padding:44px 0}}
@media(max-width:620px){.wrap{padding:0 16px}.nav-mobile{padding:0 16px 12px}
.scene-panel{width:auto;left:12px;right:12px;bottom:8px;padding:10px 12px 9px;max-height:38vh;overflow-y:auto}
.scene-panel .panel-title{font-size:16px;margin:0 0 3px}
.scene-panel p{font-size:10px;margin:0 0 6px;line-height:1.3}
.scene-panel dl{grid-template-columns:1fr auto;font-size:9px;gap:3px 8px;padding-top:6px}
.scene-panel .eyebrow{margin-bottom:4px}
.verify-line{margin-top:5px;font-size:8px}
.scene-controls{right:8px;left:8px;top:48px;max-width:none}
.scene-controls>div:first-child{flex-wrap:wrap;gap:4px}
.scene-controls button{flex:1 1 calc(50% - 4px);text-align:center;padding:5px 4px;font-size:9px}
.planet-quick-bar{flex-wrap:nowrap;overflow-x:auto;-webkit-overflow-scrolling:touch;padding-bottom:2px}
.planet-quick-bar button{flex:0 0 auto}
.scene-help{display:none}
.scene-mode{display:none}
.scene-top{left:8px;right:8px;top:10px}
.scene-label{font-size:9px}
.hero-grid{min-height:auto}
.scene-shell{min-height:560px}
.planets-row{gap:8px}
.utility{display:none}
.header-row{grid-template-columns:1fr}
.intro-note{grid-template-columns:1fr}}
@media(max-width:420px){h1{letter-spacing:-.03em}.scene-controls button{font-size:9px;padding:6px 4px}.planet-quick-bar button{font-size:8px;padding:4px 5px}.scale-viz,.source-panel{padding:24px 20px}}

/* Moon Phases page (/moon/phases/) — split system/Earth view lab */
.page-intro{padding:64px 0 44px;border-bottom:1px solid var(--rule)}
.page-intro h1{font-size:clamp(36px,4.4vw,58px)}
.page-intro .lead{margin-bottom:0}
.phase-lab{border:1px solid var(--rule)}
.phase-views{display:grid;grid-template-columns:1.3fr 1fr}
.phase-view-system{position:relative;background:var(--space);min-height:380px;overflow:hidden;color:#f4f6f8;border-right:1px solid var(--rule)}
.phase-view-system canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.phase-view-label{position:absolute;z-index:2;left:16px;top:14px;font:600 10px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.1em;text-transform:uppercase;color:#b9c0c7;pointer-events:none}
.phase-view-earth{background:#ece9e1;padding:20px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}
.phase-view-earth .phase-view-label{position:static;color:var(--muted);margin-bottom:14px}
#moonEarthView{background:#101419;border-radius:50%;box-shadow:0 0 0 1px var(--rule)}
.phase-name{margin-top:14px;font:600 20px Georgia,serif}
.phase-controls{padding:18px 22px;border-top:1px solid var(--rule);background:#ece9e1}
.phase-controls input[type="range"]{width:100%;accent-color:var(--accent)}
.phase-hint{margin-top:8px;font-size:11px;color:var(--muted)}
.phase-facts{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:28px}
.phase-facts div{border-top:2px solid var(--ink);padding:12px 0;font-size:11px;color:var(--muted)}
.phase-facts strong{display:block;font:600 14px Georgia,serif;color:var(--ink);margin-bottom:2px}
@media(max-width:980px){.phase-views{grid-template-columns:1fr}.phase-view-system{border-right:0;border-bottom:1px solid var(--rule)}.phase-facts{grid-template-columns:1fr 1fr}}

/* Not to Scale page (/learn/not-to-scale/) */
.mode-toggle{display:flex;gap:8px;margin-bottom:20px}
.mode-toggle button{font:600 11px ui-monospace,SFMono-Regular,Menlo,monospace;padding:9px 16px;border:1px solid var(--rule);background:transparent;color:var(--muted);cursor:pointer;border-radius:3px}
.mode-toggle button.active{background:var(--ink);color:#fff;border-color:var(--ink)}
.scale-compare{border:1px solid var(--rule);background:#ece9e1;padding:30px 34px 34px}
.mode-panel{display:none}
.mode-panel.active{display:block}
.scale-track{position:relative;height:90px;border-bottom:1px solid #aaa59a;margin-top:10px}
.scale-dot{position:absolute;bottom:0;width:10px;height:10px;border-radius:50%;background:var(--accent);transform:translateX(-50%)}
.scale-dot-label{position:absolute;bottom:16px;transform:translateX(-50%);font:500 9px ui-monospace,SFMono-Regular,Menlo,monospace;color:#53585c;white-space:nowrap}
.scale-caption{margin-top:14px;font-size:12px;color:var(--muted)}
@media(max-width:620px){.scale-compare{padding:22px 18px 26px}}

/* Planet Size Comparison page */
.compare-picker{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:24px}
.compare-picker select{font:600 13px ui-monospace,SFMono-Regular,Menlo,monospace;padding:8px 12px;border:1px solid var(--rule);background:#fff;border-radius:3px}
.compare-picker .vs{font:700 12px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--muted)}
.compare-stage{display:flex;align-items:flex-end;justify-content:center;gap:40px;min-height:220px;padding:20px 0}
.compare-planet{display:flex;flex-direction:column;align-items:center;gap:10px}
.compare-planet .ball{transition:width .3s ease,height .3s ease}
.compare-planet span{font:600 12px ui-monospace,SFMono-Regular,Menlo,monospace}
.compare-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;border-top:1px solid #aaa59a;padding-top:18px}
.compare-stats div{text-align:center}
.compare-stats strong{display:block;font:600 22px Georgia,serif;color:var(--ink)}
.compare-stats span{font-size:11px;color:var(--muted)}
@media(max-width:620px){.compare-stats{grid-template-columns:1fr}}

/* Astronomical Unit page */
.au-picker{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}
.au-picker button{font:500 11px ui-monospace,SFMono-Regular,Menlo,monospace;padding:7px 12px;border:1px solid var(--rule);background:transparent;color:var(--ink);cursor:pointer;border-radius:3px}
.au-picker button.active{background:var(--ink);color:#fff;border-color:var(--ink)}
.au-custom{display:flex;align-items:center;gap:10px;margin-bottom:24px;font-size:12px;color:var(--muted)}
.au-custom input{width:80px;font:600 13px ui-monospace,SFMono-Regular,Menlo,monospace;padding:6px 8px;border:1px solid var(--rule);border-radius:3px}
.au-track{position:relative;height:110px;border-bottom:1px solid #aaa59a;margin-top:10px}
.au-dot{position:absolute;bottom:0;width:10px;height:10px;border-radius:50%;background:var(--accent);transform:translateX(-50%)}
.au-dot-label{position:absolute;bottom:16px;transform:translateX(-50%);font:500 9px ui-monospace,SFMono-Regular,Menlo,monospace;color:#53585c;white-space:nowrap;text-align:center}
.au-dot-label b{display:block;color:var(--ink);font-size:10px}

/* Distance Scale page — stacked real-vs-compressed comparison */
.dist-compare-label{font:600 10px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin:26px 0 6px}
.dist-compare-label:first-child{margin-top:0}
.dist-track{position:relative;height:56px;border-bottom:1px solid #aaa59a}
.dist-dot{position:absolute;bottom:0;width:9px;height:9px;border-radius:50%;background:var(--accent);transform:translateX(-50%)}
.dist-dot-label{position:absolute;bottom:14px;transform:translateX(-50%);font:500 9px ui-monospace,SFMono-Regular,Menlo,monospace;color:#53585c;white-space:nowrap}

/* Eclipses page */
.eclipse-lab{border:1px solid var(--rule)}
.eclipse-view{position:relative;background:var(--space);min-height:420px;overflow:hidden;color:#f4f6f8}
.eclipse-view canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.eclipse-controls{padding:18px 22px;border-top:1px solid var(--rule);background:#ece9e1;display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.eclipse-controls input[type="range"]{flex:1 1 260px;min-width:180px;accent-color:var(--accent)}
.eclipse-controls button{font:500 11px ui-monospace,SFMono-Regular,Menlo,monospace;padding:7px 12px;border:1px solid var(--rule);background:transparent;color:var(--ink);cursor:pointer;border-radius:3px}
.eclipse-controls button.active{background:var(--ink);color:#fff;border-color:var(--ink)}
.eclipse-controls label{display:flex;align-items:center;gap:6px;font-size:11px;color:var(--muted)}
.eclipse-readout{padding:14px 22px;border-top:1px solid var(--rule);font-size:12px;color:var(--ink);background:#ece9e1}
.eclipse-readout strong{font-family:Georgia,serif;font-size:15px}

/* Light-year page */
.ly-picker{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}
.ly-picker button{font:500 11px ui-monospace,SFMono-Regular,Menlo,monospace;padding:9px 14px;border:1px solid var(--rule);background:transparent;color:var(--ink);cursor:pointer;border-radius:3px;text-align:left}
.ly-picker button.active{background:var(--ink);color:#fff;border-color:var(--ink)}
.ly-readout{border-top:1px solid #aaa59a;padding-top:20px}
.ly-readout .big{font:600 34px Georgia,serif;color:var(--ink)}
.ly-readout p{font-size:13px;color:var(--muted);max-width:560px;margin:8px 0 0}
.ly-ladder{border-top:1px solid var(--rule);margin-top:10px}
.ly-ladder li{display:grid;grid-template-columns:130px 1fr;gap:16px;padding:14px 0;border-bottom:1px solid var(--rule);align-items:baseline;list-style:none}
.ly-ladder b{font:600 13px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--accent)}
.ly-ladder span{font-size:13px;color:var(--ink)}

/* Universe scale page */
.zoom-stage{text-align:center;padding:10px 0 6px}
.zoom-step-no{font:600 10px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.1em;text-transform:uppercase;color:var(--accent)}
.zoom-title{font:600 32px Georgia,serif;margin:8px 0 4px}
.zoom-size{font:600 15px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--muted)}
.zoom-desc{max-width:560px;margin:14px auto 0;font-size:13px;color:var(--ink)}
.zoom-factor{display:inline-block;margin-top:18px;padding:8px 16px;background:var(--ink);color:#fff;font:600 12px ui-monospace,SFMono-Regular,Menlo,monospace;border-radius:3px}
.zoom-nav{display:flex;justify-content:space-between;align-items:center;margin-top:28px}
.zoom-nav button{font:600 11px ui-monospace,SFMono-Regular,Menlo,monospace;padding:9px 16px;border:1px solid var(--rule);background:transparent;color:var(--ink);cursor:pointer;border-radius:3px}
.zoom-nav button:disabled{opacity:.35;cursor:default}
.zoom-dots{display:flex;gap:6px}
.zoom-dots span{width:7px;height:7px;border-radius:50%;background:var(--rule)}
.zoom-dots span.active{background:var(--accent)}

/* Gravity comparison page */
.weight-input{display:flex;align-items:center;gap:10px;margin-bottom:24px}
.weight-input input{width:110px;font:600 20px Georgia,serif;padding:8px 12px;border:1px solid var(--rule);border-radius:3px}
.weight-input select{font:600 13px ui-monospace,SFMono-Regular,Menlo,monospace;padding:8px 10px;border:1px solid var(--rule);border-radius:3px;background:#fff}
.weight-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--rule);border:1px solid var(--rule)}
.weight-cell{background:#ece9e1;padding:16px 14px;text-align:center}
.weight-cell.you{background:#ded9cd}
.weight-cell .planet{font:600 10px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.06em;text-transform:uppercase;color:var(--accent)}
.weight-cell .val{font:600 22px Georgia,serif;margin:6px 0 2px}
.weight-cell .sub{font-size:10px;color:var(--muted)}
@media(max-width:620px){.weight-grid{grid-template-columns:repeat(2,1fr)}}

/* Gravity and orbits page — cannonball sandbox */
.orbit-sandbox{border:1px solid var(--rule)}
.orbit-canvas-wrap{position:relative;background:var(--space);min-height:420px;overflow:hidden}
.orbit-canvas-wrap canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.orbit-status{position:absolute;z-index:2;left:16px;top:14px;font:600 11px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.06em;text-transform:uppercase;color:#e9edf0;background:rgba(10,14,20,.7);padding:6px 10px;border-radius:3px}
.orbit-controls{padding:18px 22px;border-top:1px solid var(--rule);background:#ece9e1;display:flex;flex-wrap:wrap;gap:14px;align-items:center}
.orbit-controls input[type="range"]{flex:1 1 220px;min-width:160px;accent-color:var(--accent)}
.orbit-controls button{font:600 11px ui-monospace,SFMono-Regular,Menlo,monospace;padding:9px 16px;border:1px solid var(--ink);background:var(--ink);color:#fff;cursor:pointer;border-radius:3px}
.orbit-controls .speed-val{font:600 13px ui-monospace,SFMono-Regular,Menlo,monospace;min-width:70px}

/* Temperature comparison page */
.temp-chart{display:flex;align-items:flex-end;gap:14px;height:260px;padding-top:20px;border-bottom:1px solid #aaa59a}
.temp-bar-col{flex:1;min-width:34px;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;height:100%}
@media(max-width:620px){.temp-chart{overflow-x:auto;-webkit-overflow-scrolling:touch;gap:10px}.temp-bar-col{flex:0 0 auto;width:38px}}
.temp-bar{width:100%;max-width:56px;border-radius:2px 2px 0 0;position:relative}
.temp-bar .temp-val{position:absolute;top:-20px;left:0;right:0;text-align:center;font:600 11px ui-monospace,SFMono-Regular,Menlo,monospace}
.temp-bar-col .name{margin-top:8px;font:600 10px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--muted)}
.temp-zero-line{position:relative}

/* Pluto page — criteria checklist */
.criteria-table{width:100%;border-collapse:collapse;border-top:2px solid var(--ink)}
.criteria-table th,.criteria-table td{text-align:center;padding:14px 10px;border-bottom:1px solid var(--rule)}
.criteria-table th:first-child,.criteria-table td:first-child{text-align:left}
.criteria-table th{font:600 10px ui-monospace,SFMono-Regular,Menlo,monospace;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.criteria-table .yes{color:#2b663b;font-weight:700}
.criteria-table .no{color:var(--accent);font-weight:700}

/* Seasons page */
.season-lab{border:1px solid var(--rule)}
.season-view{position:relative;background:var(--space);min-height:420px;overflow:hidden;color:#f4f6f8}
.season-view canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.season-readout{position:absolute;z-index:2;left:16px;top:14px;background:rgba(10,14,20,.75);padding:10px 14px;border-radius:3px}
.season-readout .label{font:600 9px ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.08em;text-transform:uppercase;color:#9ea8b2;margin-bottom:4px}
.season-readout .val{font:600 18px Georgia,serif}
.season-controls{padding:18px 22px;border-top:1px solid var(--rule);background:#ece9e1}
.season-controls input[type="range"]{width:100%;accent-color:var(--accent)}
.season-months{display:flex;justify-content:space-between;font:500 9px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--muted);margin-top:6px}

/* Star life-cycle page */
.mass-toggle{display:flex;gap:8px;margin-bottom:20px;justify-content:center}
.mass-toggle button{font:600 11px ui-monospace,SFMono-Regular,Menlo,monospace;padding:9px 16px;border:1px solid var(--rule);background:transparent;color:var(--ink);cursor:pointer;border-radius:3px}
.mass-toggle button.active{background:var(--ink);color:#fff;border-color:var(--ink)}
.life-stages{display:flex;flex-wrap:wrap;justify-content:center;gap:0;align-items:center}
.life-stage{display:flex;flex-direction:column;align-items:center;gap:8px;width:130px;text-align:center}
.life-stage .dot{width:34px;height:34px;border-radius:50%;border:2px solid var(--ink)}
.life-stage .lbl{font:600 11px ui-monospace,SFMono-Regular,Menlo,monospace}
.life-stage .desc{font-size:10px;color:var(--muted)}
.life-arrow{color:var(--muted);font-size:18px;padding:0 4px}
@media(max-width:780px){.life-stages{flex-direction:column}.life-arrow{transform:rotate(90deg)}}

/* Black holes page — labeled schematic */
.bh-diagram{background:var(--space);padding:20px}
.bh-diagram svg{width:100%;height:auto;display:block}
.bh-legend{border-top:1px solid var(--rule);margin-top:0}
.bh-legend li{display:grid;grid-template-columns:28px 1fr;gap:13px;padding:14px 0;border-bottom:1px solid var(--rule);list-style:none}
.bh-legend .num{font:600 10px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--accent)}
.bh-legend b{font-size:13px;display:block;margin-bottom:2px}
.bh-legend span{font-size:12px;color:var(--muted)}

/* Electromagnetic spectrum page */
.spectrum-bar{height:36px;border-radius:3px;background:linear-gradient(90deg,#7a3fa0,#3e6f91,#3fa066,#e0c23f,#e08a3f,#bd4c2f,#7a2020);position:relative;margin-top:20px}
.spectrum-visible{position:absolute;top:-6px;bottom:-6px;border:2px solid #fff;border-radius:3px;pointer-events:none}
.spectrum-slider{width:100%;margin-top:14px;accent-color:var(--ink)}
.spectrum-labels{display:flex;justify-content:space-between;font:500 9px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--muted);margin-top:4px}
.spectrum-readout{border-top:1px solid #aaa59a;margin-top:20px;padding-top:18px}
.spectrum-readout .band{font:600 24px Georgia,serif}
.spectrum-readout p{font-size:13px;color:var(--ink);max-width:600px;margin:8px 0 0}

/* Planet types page */
.ptype-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.ptype-card{border-top:2px solid var(--ink);padding:18px 0}
.ptype-card svg{width:100%;height:140px;display:block;margin-bottom:14px}
.ptype-card h3{font:600 18px Georgia,serif;margin:0 0 6px}
.ptype-card ul{margin:10px 0 0;padding:0 0 0 16px;font-size:11px;color:var(--muted)}
.ptype-card li{margin-bottom:4px}
@media(max-width:780px){.ptype-grid{grid-template-columns:1fr}}

/* Earth-Moon true scale page */
.emscale-outer{position:relative}
.emscale-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;border-top:1px solid #aaa59a;border-bottom:1px solid #aaa59a;padding:30px 0}
.emscale-track{position:relative;height:70px;width:1900px}
.emscale-body{position:absolute;bottom:0;border-radius:50%;box-shadow:inset -6px -8px 14px rgba(0,0,0,.3)}
.emscale-label{position:absolute;bottom:-22px;font:600 10px ui-monospace,SFMono-Regular,Menlo,monospace;color:var(--muted);white-space:nowrap}
.emscale-hint{margin-top:10px;font-size:11px;color:var(--muted)}
.emscale-fade{position:absolute;top:1px;bottom:1px;right:0;width:70px;background:linear-gradient(90deg,transparent,#ece9e1 85%);pointer-events:none;transition:opacity .3s ease}
.emscale-fade.hidden{opacity:0}
.emscale-scrollcue{position:absolute;right:14px;top:50%;transform:translateY(-50%);background:var(--accent);color:#fff;font:600 10px ui-monospace,SFMono-Regular,Menlo,monospace;padding:7px 12px;border-radius:14px;white-space:nowrap;box-shadow:0 2px 8px rgba(0,0,0,.2);animation:emscaleNudge 1.6s ease-in-out infinite;transition:opacity .3s ease}
.emscale-scrollcue.hidden{opacity:0;pointer-events:none}
@keyframes emscaleNudge{0%,100%{transform:translate(0,-50%)}50%{transform:translate(6px,-50%)}}
@media(prefers-reduced-motion:reduce){.emscale-scrollcue{animation:none}}

/* Tides page */
.tide-diagram{background:var(--space);padding:20px}
.tide-diagram svg{width:100%;height:auto;display:block;max-width:480px;margin:0 auto}

/* Transit method page */
.transit-lab{border:1px solid var(--rule);background:#0b1016}
.transit-orbit-wrap{position:relative;height:120px}
.transit-orbit-wrap canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.transit-graph-wrap{position:relative;height:160px;border-top:1px solid rgba(255,255,255,.15)}
.transit-graph-wrap canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.transit-controls{padding:16px 22px;border-top:1px solid var(--rule);background:#ece9e1}
.transit-controls input[type="range"]{width:100%;accent-color:var(--accent)}

/* Cluster Directory Grid on Homepage */
.cluster-directory-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;border-top:1px solid var(--rule);padding-top:28px}
.cluster-column{display:flex;flex-direction:column;gap:14px}
.cluster-header h3{font:600 18px Georgia,serif;margin:0 0 4px;color:var(--ink)}
.cluster-header p{font-size:11px;color:var(--muted);margin:0;line-height:1.35}
.cluster-list{list-style:none;padding:0;margin:0;border-top:1px solid var(--rule)}
.cluster-list li{border-bottom:1px solid var(--rule)}
.cluster-list a{display:block;padding:9px 0;text-decoration:none;transition:background .15s ease}
.cluster-list a:hover strong{color:var(--accent)}
.cluster-list strong{display:block;font-size:12px;font-weight:600;color:var(--ink)}
.cluster-list span{display:block;font-size:10px;color:var(--muted);margin-top:2px}
@media(max-width:960px){.cluster-directory-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:580px){.cluster-directory-grid{grid-template-columns:1fr}}

/* Next in series card hover */
.next-series-card{transition:all .15s ease}
.next-series-card:hover{background:rgba(0,0,0,0.05)!important;border-color:var(--accent)!important}