/* Little Universe Explorer. Every selector starts with .lue-root or a lue- class. */
.lue-root{--lue-bg:#0a0a26;--lue-bg2:#12103c;--lue-blue:#5468ff;--lue-lav:#b2a4ff;--lue-teal:#4be3d4;--lue-sun:#ffc23a;--lue-ink:#f1f1ff;--lue-mute:#bdbde6;--lue-card:rgba(255,255,255,.055);--lue-line:rgba(160,140,255,.26);--lue-r:24px;--lue-grad:linear-gradient(135deg,#4d63ff,#7b5cff);
position:relative;isolation:isolate;overflow:hidden;box-sizing:border-box;color:var(--lue-ink);font-size:17px;line-height:1.6;text-align:left;
font-family:ui-rounded,"SF Pro Rounded","Hiragino Maru Gothic ProN",Nunito,Quicksand,"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
background:radial-gradient(900px 560px at 6% 4%,rgba(118,66,228,.6),transparent 62%),radial-gradient(1100px 700px at 104% 26%,rgba(54,60,196,.5),transparent 62%),radial-gradient(900px 600px at 14% 78%,rgba(98,52,200,.38),transparent 62%),radial-gradient(900px 600px at 90% 98%,rgba(70,40,170,.4),transparent 60%),linear-gradient(180deg,#0c0b2e,#0a0a27 55%,#0b0826)}
.lue-root *,.lue-root *::before,.lue-root *::after{box-sizing:border-box}
.lue-breakout{width:var(--lue-vw,100vw);max-width:none;margin-left:calc(50% - (var(--lue-vw,100vw) / 2))}
html:has(.lue-breakout){overflow-x:clip}
.lue-root[data-lang="en"] .lue-zh,.lue-root[data-lang="zh"] .lue-en{display:none!important}
.lue-root[data-lang="zh"]{letter-spacing:.03em;line-height:1.75}
.lue-root h1,.lue-root h2,.lue-root h3,.lue-root h4,.lue-root p,.lue-root ul,.lue-root figure{margin:0;padding:0;color:inherit;font-family:inherit;text-transform:none;letter-spacing:inherit}
.lue-root ul{list-style:none}
.lue-root a{color:inherit;text-decoration:none}
.lue-root button{font:inherit;color:inherit;cursor:pointer;margin:0;text-transform:none;letter-spacing:inherit}
.lue-root svg{max-width:100%;height:auto}
.lue-root [hidden]{display:none!important}
.lue-root :focus-visible{outline:3px solid var(--lue-sun);outline-offset:3px;border-radius:10px}

/* Star field: dots plus soft blue sparkles */
.lue-stars{position:absolute;inset:0;z-index:-1;pointer-events:none;overflow:hidden;
background-image:radial-gradient(1.3px 1.3px at 12% 18%,#fff,transparent),radial-gradient(1px 1px at 33% 72%,#cfe0ff,transparent),radial-gradient(1.7px 1.7px at 58% 34%,#fff,transparent),radial-gradient(1px 1px at 81% 62%,#ffe9c8,transparent),radial-gradient(1.4px 1.4px at 92% 12%,#fff,transparent),radial-gradient(1px 1px at 46% 90%,#d8c9ff,transparent),radial-gradient(1.5px 1.5px at 7% 54%,#fff,transparent),radial-gradient(1px 1px at 70% 8%,#fff,transparent),radial-gradient(2px 2px at 24% 40%,#ff9be0,transparent),radial-gradient(1.2px 1.2px at 64% 78%,#fff,transparent),radial-gradient(1px 1px at 39% 14%,#bcd0ff,transparent),radial-gradient(1.2px 1.2px at 86% 88%,#fff,transparent),
radial-gradient(1px 1px at 20% 28%,#fff,transparent),radial-gradient(1.2px 1.2px at 52% 58%,#cfe0ff,transparent),radial-gradient(1px 1px at 76% 38%,#fff,transparent),radial-gradient(1.4px 1.4px at 4% 90%,#fff,transparent),radial-gradient(1.8px 1.8px at 96% 70%,#ff9be0,transparent);
background-size:610px 610px,610px 610px,610px 610px,610px 610px,610px 610px,610px 610px,610px 610px,610px 610px,610px 610px,610px 610px,610px 610px,610px 610px,340px 340px,340px 340px,340px 340px,340px 340px,340px 340px}
.lue-spark{position:absolute;width:var(--s,22px);height:var(--s,22px);margin:-11px 0 0 -11px;background:radial-gradient(circle,#fff 0 10%,rgba(143,176,255,.55) 14%,transparent 42%),linear-gradient(90deg,transparent,#8fb0ff 50%,transparent) center/100% 2px no-repeat,linear-gradient(0deg,transparent,#8fb0ff 50%,transparent) center/2px 100% no-repeat;animation:lue-tw 4.5s ease-in-out infinite;animation-delay:var(--d,0s)}
@keyframes lue-tw{50%{opacity:.35;transform:scale(.75)}}
.lue-inner{width:100%;max-width:1280px;margin:0 auto;padding:0 clamp(16px,4vw,32px) 24px}

/* Top bar: glass bar, links left and right, logo in the middle */
.lue-nav{padding:22px 0 6px;position:relative;z-index:5}
.lue-navbar{display:grid;grid-template-columns:1fr auto 1fr;grid-template-areas:"l brand r";align-items:center;gap:18px;padding:12px 28px;border-radius:28px;background:linear-gradient(180deg,rgba(255,255,255,.11),rgba(255,255,255,.04));border:1px solid rgba(255,255,255,.14);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:0 14px 44px rgba(18,8,80,.4)}
.lue-links{display:flex;flex-wrap:wrap;gap:2px 24px}
.lue-links-l{grid-area:l}
.lue-links-r{grid-area:r;display:flex;align-items:center;justify-content:flex-end;gap:20px}
.lue-links a{display:block;padding:6px 1px;color:var(--lue-mute);font-weight:600;font-size:.95rem;white-space:nowrap;border-bottom:2px solid transparent}
.lue-links a:hover{color:#fff}
.lue-links a[aria-current="page"]{color:#fff;border-bottom-color:var(--lue-lav)}
.lue-brand{grid-area:brand;display:block;text-align:center}
.lue-brand-text{display:flex;flex-direction:column;align-items:center;line-height:1.15}
.lue-brand-en{font-weight:800;font-size:1.35rem;color:#fff}
.lue-brand-zh{font-weight:700;font-size:.95rem;color:var(--lue-lav);letter-spacing:.24em;margin-right:-.24em}
.lue-lang{display:inline-flex;flex:none;padding:3px;border-radius:999px;background:rgba(255,255,255,.08);border:1px solid var(--lue-line)}
.lue-lang button{border:0;background:transparent;padding:5px 12px;border-radius:999px;font-weight:700;font-size:.88rem;color:var(--lue-mute)}
.lue-lang button[aria-pressed="true"]{background:var(--lue-grad);color:#fff}
.lue-burger{display:none;grid-area:burger;width:44px;height:44px;padding:0 6px;border:0;background:transparent;flex-direction:column;justify-content:center;align-items:flex-end;gap:5px}
.lue-burger span{display:block;width:24px;height:2px;border-radius:2px;background:#fff}
.lue-burger span:nth-child(2){width:16px}

/* Buttons */
.lue-btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 28px;border-radius:999px;border:1px solid rgba(255,255,255,.25);background:var(--lue-grad);color:#fff!important;font-weight:700;box-shadow:0 10px 30px rgba(84,104,255,.5),inset 0 1px 0 rgba(255,255,255,.35);transition:transform .15s ease,box-shadow .15s ease}
.lue-btn:hover{transform:translateY(-2px)}
.lue-btn-ghost{background:rgba(255,255,255,.04);color:var(--lue-ink)!important;border-color:var(--lue-lav);box-shadow:none}
.lue-btn-big{padding:15px 40px;font-size:1.15rem}
.lue-link{color:var(--lue-teal)!important;font-weight:800;border-bottom:2px solid transparent}
.lue-link:hover{border-bottom-color:currentColor}

/* Hero */
.lue-hero{display:grid;grid-template-columns:1.1fr 1fr;gap:clamp(20px,5vw,60px);align-items:center;padding:clamp(24px,6vw,64px) 0 clamp(36px,6vw,56px)}
.lue-root .lue-hero h1{font-size:clamp(2.2rem,6vw,4rem);line-height:1.1;font-weight:800;margin-bottom:16px;background:linear-gradient(180deg,#fff 25%,#a7a4cf);-webkit-background-clip:text;background-clip:text;color:transparent;-webkit-text-fill-color:transparent}
.lue-lead{font-size:clamp(1.02rem,2vw,1.25rem);color:var(--lue-mute);max-width:34em;margin-bottom:26px}
.lue-hero-center{grid-template-columns:minmax(0,1fr);text-align:center;justify-items:center;gap:0;padding:clamp(28px,5vw,56px) 0 8px}
.lue-hero-center .lue-lead{margin-inline:auto}
.lue-hero-topic{grid-template-columns:1.3fr 1fr;padding-bottom:28px}
.lue-root .lue-hero-topic h1{font-size:clamp(2rem,5vw,3.2rem)}
.lue-hero-compact{padding-bottom:4px}
.lue-hero-compact .lue-lead{margin-bottom:8px}
.lue-hero-art{text-align:center}
.lue-hero-art .lue-art{width:min(100%,300px);filter:drop-shadow(0 0 40px rgba(110,90,255,.5))}
.lue-hero-art figcaption{font-size:.85rem;color:var(--lue-mute);margin-top:8px}
.lue-center{text-align:center}

/* Home: glowing, tilted solar system drawing and rocket button */
.lue-home-stage{position:relative;max-width:1100px;margin:0 auto;padding-bottom:16px}
.lue-orbit{display:block}
.lue-orbit-svg{display:block;width:100%;height:auto;overflow:visible}
.lue-pill{display:flex;align-items:center;gap:16px;height:58px;padding:6px 32px 6px 6px;border-radius:999px;background:linear-gradient(90deg,rgba(255,255,255,.17),rgba(255,255,255,.04));border:1px solid rgba(150,130,255,.55);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);color:#fff!important;font-weight:600;font-size:1.02rem;width:fit-content;max-width:86%;box-shadow:0 10px 36px rgba(60,40,200,.35);transition:transform .15s ease}
.lue-pill:hover{transform:translateY(-2px)}
.lue-pill-center{margin:-6px auto 14px}
.lue-pill-icon{display:grid;place-items:center;flex:none;width:46px;height:46px;border-radius:50%;background:linear-gradient(135deg,#5368ff,#8b4dff);box-shadow:0 0 18px rgba(110,90,255,.7)}
.lue-pill-icon svg{width:24px;height:24px}
.lue-pill-text{flex:none;text-align:left;white-space:nowrap}
.lue-pill[aria-pressed="false"]{opacity:.7}

/* Sections, grids, cards */
.lue-section{padding:clamp(28px,5vw,48px) 0}
.lue-section>h2{font-size:clamp(1.5rem,3.2vw,2.1rem);font-weight:900;margin-bottom:20px}
.lue-sub{font-size:1.2rem;font-weight:800;margin:28px 0 14px;color:var(--lue-lav)}
.lue-grid{display:grid;gap:18px}
.lue-grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.lue-grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.lue-grid-4{grid-template-columns:repeat(4,minmax(0,1fr))}
.lue-card{display:block;padding:24px;border-radius:var(--lue-r);background:var(--lue-card);border:1px solid var(--lue-line);backdrop-filter:blur(4px)}
.lue-card h3,.lue-card h4{font-size:1.25rem;font-weight:800;margin-bottom:8px}
.lue-card p{color:var(--lue-mute)}
.lue-topic{transition:transform .2s ease,border-color .2s ease}
.lue-topic:hover{transform:translateY(-4px);border-color:var(--lue-teal)}
.lue-topic .lue-art{width:92px;margin-bottom:12px}
.lue-note{font-size:.9rem;color:var(--lue-mute);margin-top:14px}
.lue-kind{font-size:.85rem;font-weight:800;color:var(--lue-teal)!important;margin-bottom:6px}
.lue-planet-card .lue-pdot{margin-bottom:12px}
.lue-planet-card .lue-link{display:inline-block;margin-top:10px}
.lue-facts{display:grid;gap:12px}
.lue-facts li{padding:16px 20px 16px 52px;border-radius:18px;background:var(--lue-card);border:1px solid var(--lue-line);position:relative}
.lue-facts li::before{content:"";position:absolute;left:20px;top:22px;width:16px;height:16px;border-radius:50%;background:radial-gradient(circle at 35% 30%,#fff7c8,var(--lue-sun))}
.lue-did{text-align:center;padding:36px 20px;border-radius:32px;background:linear-gradient(135deg,rgba(77,124,255,.28),rgba(185,168,255,.16));border:1px solid var(--lue-line);margin:20px 0}
.lue-did-text{font-size:clamp(1.15rem,2.6vw,1.6rem);font-weight:700;max-width:30em;margin:0 auto 20px!important}
.lue-grownups p{max-width:46em;color:var(--lue-mute)}

/* Planet swatches */
.lue-pdot{display:inline-block;position:relative;flex:none;width:56px;height:56px;border-radius:50%;background:radial-gradient(circle at 32% 28%,var(--c1),var(--c2) 72%,#05060f 125%);box-shadow:inset -9px -9px 18px rgba(0,0,0,.45),0 0 18px rgba(77,124,255,.28)}
.lue-pdot-sun{box-shadow:0 0 28px 4px rgba(255,170,40,.55)}
.lue-pdot-saturn::after{content:"";position:absolute;left:-30%;right:-30%;top:40%;height:20%;border:3px solid rgba(240,222,170,.85);border-radius:50%;transform:rotate(-16deg)}
.lue-pdot-fallback{width:150px;height:150px;--c1:#ffe27a;--c2:#4d7cff}

/* Planet size bars */
.lue-bars{display:grid;gap:10px}
.lue-bars li{display:grid;grid-template-columns:34px 92px 1fr 70px;gap:12px;align-items:center}
.lue-bars .lue-pdot{width:28px;height:28px;box-shadow:inset -4px -4px 9px rgba(0,0,0,.45)}
.lue-bars .lue-pdot-saturn::after{border-width:2px}
.lue-bar{display:block;height:14px;border-radius:99px;background:rgba(255,255,255,.08)}
.lue-bar i{display:block;height:100%;width:var(--w);border-radius:99px;background:linear-gradient(90deg,var(--lue-blue),var(--lue-teal))}
.lue-bar-num{color:var(--lue-mute);font-weight:700}

/* Tabs, split layouts */
.lue-split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:28px;align-items:center}
.lue-tablist{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}
.lue-tab{padding:9px 18px;border-radius:999px;border:2px solid var(--lue-line);background:transparent;font-weight:800}
.lue-tab[aria-pressed="true"]{background:var(--lue-lav);color:#1b1640;border-color:var(--lue-lav)}
.lue-tabpanel{font-size:1.1rem}
.lue-layers{width:min(100%,360px);display:block;margin:0 auto}
.lue-layers circle{opacity:.55;transition:opacity .2s}
.lue-layers circle.is-on{opacity:1;filter:drop-shadow(0 0 10px #fff4b0)}
.lue-layers-fig figcaption,.lue-mw figcaption{font-size:.85rem;color:var(--lue-mute);text-align:center;margin-top:8px}
.lue-gal-art{text-align:center}.lue-gal-art .lue-art{width:min(100%,260px)}
.lue-mw{max-width:460px;margin:0 auto}
.lue-mw-wrap{position:relative}
.lue-mw-pin{position:absolute;left:66%;top:60%;display:flex;align-items:center;gap:6px;font-size:.85rem;font-weight:800;white-space:nowrap}
.lue-mw-pin i{width:12px;height:12px;border-radius:50%;background:var(--lue-sun);box-shadow:0 0 0 4px rgba(255,211,92,.35)}
.lue-mw-pin span{background:rgba(7,11,36,.8);padding:2px 8px;border-radius:99px}

/* Stepper */
.lue-stepper{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:28px;align-items:center}
.lue-step-visual{display:grid;place-items:center;height:240px}
.lue-step-orb{display:block;width:calc(var(--s,60)*1.9px);height:calc(var(--s,60)*1.9px);max-width:100%;border-radius:50%;background:radial-gradient(circle at 35% 30%,#fff,var(--k,#ffd35c) 55%,transparent 120%);box-shadow:0 0 50px 10px var(--k,#ffd35c);transition:all .5s ease}
.lue-step h4{font-size:1.3rem;font-weight:800;margin-bottom:6px}
.lue-step-nav{display:flex;align-items:center;gap:14px;margin-top:18px}
.lue-step-count{color:var(--lue-mute);font-weight:700}

/* Black hole slider */
.lue-bh{position:relative;height:260px;margin:16px 0;border-radius:var(--lue-r);background:radial-gradient(circle at 78% 50%,#1b1f5e,#04061a 70%);border:1px solid var(--lue-line);overflow:hidden;--p:0}
.lue-bh-hole{position:absolute;right:12%;top:50%;width:84px;height:84px;margin-top:-42px;border-radius:50%;background:#000;box-shadow:0 0 0 3px rgba(185,168,255,.35)}
.lue-bh-disk{position:absolute;right:calc(12% - 70px);top:50%;width:224px;height:50px;margin-top:-25px;border-radius:50%;background:linear-gradient(90deg,#ff7a1a,#ffe27a,#4d7cff);opacity:.2;filter:blur(4px);transform:rotate(-10deg);transition:opacity .4s}
.lue-bh[data-stage="1"] .lue-bh-disk,.lue-bh[data-stage="2"] .lue-bh-disk{opacity:.7}
.lue-bh[data-stage="3"] .lue-bh-disk,.lue-bh[data-stage="4"] .lue-bh-disk{opacity:1}
.lue-bh[data-stage="2"] .lue-bh-hole,.lue-bh[data-stage="3"] .lue-bh-hole,.lue-bh[data-stage="4"] .lue-bh-hole{box-shadow:0 0 0 6px rgba(255,226,122,.55),0 0 40px 10px rgba(255,160,60,.45)}
.lue-bh-ship{position:absolute;top:50%;left:calc(6% + var(--p)*62%);width:28px;height:14px;margin-top:-7px;border-radius:60% 100% 100% 60%;background:linear-gradient(90deg,#b9a8ff,#fff);box-shadow:0 0 14px rgba(255,255,255,.7);transition:left .5s ease,transform .5s ease}
.lue-bh[data-stage="3"] .lue-bh-ship{transform:scaleX(1.8) scaleY(.7)}
.lue-bh[data-stage="4"] .lue-bh-ship{transform:scaleX(2.6) scaleY(.4)}
.lue-slider-label{display:block;font-weight:800;margin-bottom:6px}
.lue-range{width:100%;accent-color:var(--lue-sun);height:32px}
.lue-bh-text{margin-top:14px;padding:16px 20px;border-radius:18px;background:var(--lue-card);border:1px solid var(--lue-line)}
.lue-bh-text h4{font-weight:800;margin-bottom:4px}

/* Quiz */
.lue-quiz{border-top:1px solid var(--lue-line)}
.lue-q{margin-bottom:22px;padding:20px;border-radius:20px;background:var(--lue-card);border:1px solid var(--lue-line)}
.lue-q-text{font-weight:800;font-size:1.15rem;margin-bottom:12px!important}
.lue-q-opts{display:flex;flex-wrap:wrap;gap:10px}
.lue-opt{padding:10px 22px;border-radius:999px;border:2px solid var(--lue-line);background:rgba(255,255,255,.05);text-align:left;font-weight:700}
.lue-opt:hover:not(:disabled){border-color:var(--lue-lav)}
.lue-opt.is-right{background:rgba(63,224,208,.22);border-color:var(--lue-teal)}
.lue-opt.is-wrong{background:rgba(255,120,120,.18);border-color:#ff8a8a}
.lue-opt:disabled{cursor:default;opacity:.95}
.lue-q-why{margin-top:12px!important;color:var(--lue-mute)}
.lue-quiz-score{font-weight:800;font-size:1.1rem;color:var(--lue-sun)}
.lue-related-list{display:flex;flex-wrap:wrap;gap:12px}

/* Games */
.lue-game{padding:24px;border-radius:var(--lue-r);background:var(--lue-card);border:1px solid var(--lue-line);min-height:260px}
.lue-g-title{font-size:1.2rem;font-weight:800;margin-bottom:6px}
.lue-g-help{color:var(--lue-mute);margin-bottom:16px!important}
.lue-g-msg{min-height:1.6em;font-weight:800;margin:14px 0!important}
.lue-g-msg.is-good{color:var(--lue-teal)}.lue-g-msg.is-bad{color:#ff9a9a}
.lue-g-cols{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.lue-g-col{display:grid;gap:10px;align-content:start}
.lue-g-btn{display:flex;align-items:center;gap:12px;padding:10px 22px;border-radius:999px;border:2px solid var(--lue-line);background:rgba(255,255,255,.05);font-weight:800;text-align:left;min-height:56px}
.lue-g-btn:hover:not(:disabled){border-color:var(--lue-lav)}
.lue-g-btn.is-picked{border-color:var(--lue-sun);background:rgba(255,211,92,.16)}
.lue-g-btn.is-done{border-color:var(--lue-teal);background:rgba(63,224,208,.16);opacity:.8}
.lue-g-btn.is-wrong{border-color:#ff8a8a;animation:lue-shake .35s}
.lue-g-btn.is-right{border-color:var(--lue-teal);background:rgba(63,224,208,.2)}
.lue-g-btn:disabled{cursor:default}
.lue-g-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px}
.lue-g-slots{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:10px;margin:14px 0}
.lue-g-slot{min-height:64px;border:2px dashed var(--lue-line);border-radius:16px;padding:6px;display:flex;align-items:center;gap:8px;background:transparent;font-weight:800}
.lue-g-slot.is-filled{border-style:solid;background:rgba(255,255,255,.06)}
.lue-g-slot.is-right{border-color:var(--lue-teal);background:rgba(63,224,208,.18)}.lue-g-slot.is-wrong{border-color:#ff8a8a;background:rgba(255,120,120,.14)}
.lue-g-slot small{color:var(--lue-mute);font-weight:800;min-width:1.2em}
.lue-g-clue{font-size:1.3rem;font-weight:800;margin:10px 0 16px!important}
.lue-g-tf{display:flex;gap:14px;flex-wrap:wrap}
.lue-g-tf .lue-btn{min-width:150px;font-size:1.1rem}
.lue-g-score{font-size:1.3rem;font-weight:900;color:var(--lue-sun)}
@keyframes lue-shake{25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}

/* 3D explorer: wide scene, glass info card that follows the selected planet, rocket button */
.lue-explorer{display:grid;grid-template-columns:minmax(0,1fr);gap:20px;padding-bottom:16px}
.lue-ex-stage{order:1}
.lue-ex-list{order:2;display:flex;flex-wrap:wrap;gap:10px}
.lue-ex-info{order:3}
.lue-ex-canvaswrap{position:relative;width:100%;aspect-ratio:16/9;min-height:440px;max-height:84vh;border-radius:32px;overflow:hidden;background:radial-gradient(ellipse at 50% 56%,rgba(100,80,235,.3),rgba(20,16,70,0) 68%)}
.lue-ex-canvas{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none;cursor:grab;outline-offset:-4px}
.lue-ex-canvas:active{cursor:grabbing}
.lue-ex-labels{position:absolute;inset:0;pointer-events:none}
.lue-ex-label{position:absolute;left:0;top:0;pointer-events:auto;padding:2px 10px;border-radius:99px;font-size:.78rem;font-weight:700;background:rgba(14,12,50,.7);border:1px solid rgba(255,255,255,.16);color:#fff;white-space:nowrap;cursor:pointer;will-change:transform}
.lue-ex-label.is-on{background:var(--lue-grad);border-color:transparent}
.lue-ex-name{display:none}
.lue-ex-card{position:absolute;left:0;top:0;width:min(300px,72%);padding:14px 18px;border-radius:14px;background:rgba(16,14,52,.82);border:1px solid rgba(255,255,255,.14);box-shadow:0 12px 36px rgba(8,6,40,.5);font-size:.86rem;line-height:1.45;pointer-events:none;will-change:transform}
.lue-ex-card h3{font-size:.95rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase;margin-bottom:6px}
.lue-ex-card h3 span{color:var(--lue-lav);margin-left:.5em;text-transform:none}
.lue-ex-card ul{list-style:disc;padding-left:18px;display:grid;gap:3px;color:#e8e8ff}
.lue-ex-card.is-fixed{left:12px;top:auto;bottom:88px;width:calc(100% - 24px);max-width:420px;transform:none!important}
.lue-ex-status,.lue-ex-error,.lue-ex-fallback{position:absolute;inset:0;display:grid;place-content:center;gap:14px;text-align:center;padding:24px;background:rgba(10,9,40,.82);font-weight:700}
.lue-ex-fallback{background:radial-gradient(circle at 50% 40%,#1b1660,#0a0926 75%);justify-items:center}
.lue-ex-controls{position:absolute;top:14px;right:14px;display:flex;gap:6px}
.lue-ex-controls button{min-width:44px;height:44px;padding:0 16px;border-radius:999px;border:1px solid rgba(255,255,255,.18);background:rgba(14,12,50,.8);font-weight:800;font-size:1.05rem}
.lue-ex-controls button:hover{border-color:var(--lue-lav)}
.lue-ex-rotate{position:absolute;left:50%;bottom:18px;transform:translateX(-50%);cursor:pointer;text-align:left}
.lue-ex-rotate:hover{transform:translateX(-50%) translateY(-2px)}
.lue-ex-views{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.lue-ex-views button{padding:9px 18px;border-radius:999px;border:1px solid var(--lue-line);background:rgba(255,255,255,.04);font-weight:700}
.lue-ex-views button[aria-pressed="true"]{background:var(--lue-grad);border-color:transparent;color:#fff}
.lue-ex-scale{margin-top:12px;font-size:.92rem;color:var(--lue-mute)}
.lue-ex-info{padding:24px;border-radius:28px;background:var(--lue-card);border:1px solid var(--lue-line);display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.7fr);gap:6px 32px;align-items:start}
.lue-ex-info>h2,.lue-ex-info>.lue-ex-kind,.lue-ex-info>.lue-ex-stats{grid-column:1}
.lue-ex-info>.lue-facts{grid-column:2;grid-row:1/span 3}
.lue-ex-info h2{font-size:1.9rem;font-weight:800;line-height:1.2}
.lue-ex-info h2 span{color:var(--lue-lav);margin-left:.4em}
.lue-ex-kind{color:var(--lue-teal);font-weight:700;margin:4px 0 14px!important}
.lue-ex-stats{display:grid;gap:8px;margin:0 0 16px!important;font-size:.95rem}
.lue-ex-stats li{padding:8px 12px;border-radius:12px;background:rgba(255,255,255,.07)}
.lue-ex-info .lue-facts li{padding:12px 14px 12px 40px;font-size:.98rem}
.lue-ex-info .lue-facts li::before{left:14px;top:18px;width:14px;height:14px}
.lue-ex-pick{display:flex;align-items:center;gap:10px;padding:6px 16px 6px 8px;border-radius:999px;border:1px solid var(--lue-line);background:rgba(255,255,255,.05);font-weight:700}
.lue-ex-pick .lue-pdot{width:34px;height:34px;box-shadow:inset -5px -5px 10px rgba(0,0,0,.45)}
.lue-ex-pick .lue-pdot-saturn::after{border-width:2px}
.lue-ex-pick[aria-pressed="true"]{background:var(--lue-grad);border-color:transparent;color:#fff}

/* Footer */
.lue-footer{margin-top:24px;padding:28px 0 8px;border-top:1px solid var(--lue-line);display:grid;gap:16px;justify-items:start}
.lue-footer ul{display:flex;flex-wrap:wrap;gap:6px 18px}
.lue-footer a{color:var(--lue-mute);font-weight:700}
.lue-footer a:hover{color:#fff}
.lue-footer .lue-note{max-width:48em;margin:0}

/* Small screens: burger menu below 1020px */
@media (max-width:1020px){
.lue-navbar{grid-template-columns:1fr auto;grid-template-areas:"brand burger" "l l" "r r";gap:0 12px;padding:10px 18px}
.lue-brand{text-align:left}
.lue-brand-text{align-items:flex-start}
.lue-brand-zh{margin-right:0}
.lue-burger{display:flex}
.lue-links-l,.lue-links-r{display:none}
.lue-nav.is-open .lue-links-l{display:flex;flex-direction:column;gap:2px;padding-top:12px}
.lue-nav.is-open .lue-links-r{display:flex;flex-direction:column;align-items:flex-start;gap:12px;padding:6px 0 4px}
.lue-nav.is-open .lue-links-r .lue-links{flex-direction:column;gap:2px}
}
@media (max-width:900px){
.lue-hero-topic,.lue-split,.lue-stepper,.lue-ex-info{grid-template-columns:minmax(0,1fr)}
.lue-hero:not(.lue-hero-center){grid-template-columns:minmax(0,1fr)}
.lue-ex-info>.lue-facts{grid-column:1;grid-row:auto}
.lue-grid-3,.lue-grid-4{grid-template-columns:repeat(2,minmax(0,1fr))}
.lue-hero-art .lue-art{width:min(70%,240px)}
.lue-ex-canvaswrap{max-height:none;aspect-ratio:4/3}
}
@media (max-width:600px){
.lue-root{font-size:16px}
.lue-grid-2,.lue-grid-3,.lue-grid-4,.lue-g-cols{grid-template-columns:minmax(0,1fr)}
.lue-bars li{grid-template-columns:28px 70px 1fr 56px;gap:8px}
.lue-ex-canvaswrap{aspect-ratio:3/4;min-height:460px}
.lue-ex-controls button{min-width:48px;height:48px}
.lue-btn-big{width:100%}
.lue-ex-rotate{max-width:calc(100% - 28px)}
}

/* Respect reduced motion */
@media (prefers-reduced-motion:reduce){
.lue-root *,.lue-root *::before,.lue-root *::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}

/* Theme-proofing: stop the site theme from adding bullets or recolouring our links and headings */
.lue-root ul,.lue-root ol{list-style:none!important;margin:0!important;padding:0!important}
.lue-root li{list-style:none!important;margin:0!important}
.lue-root li::marker{content:""!important;font-size:0!important}
.lue-root .lue-ex-card ul{list-style:disc!important;padding-left:18px!important}
.lue-root a,.lue-root a:visited,.lue-root a:hover,.lue-root a:focus{text-decoration:none!important;box-shadow:none}
.lue-root .lue-links a{color:var(--lue-mute)!important}
.lue-root .lue-links a:hover,.lue-root .lue-links a:focus,.lue-root .lue-links a[aria-current="page"]{color:#fff!important}
.lue-root a.lue-brand,.lue-root .lue-brand-en{color:#fff!important}
.lue-root .lue-brand-zh{color:var(--lue-lav)!important}
.lue-root .lue-footer a{color:var(--lue-mute)!important}
.lue-root .lue-footer a:hover,.lue-root .lue-footer a:focus{color:#fff!important}
.lue-root a.lue-topic,.lue-root a.lue-orbit{color:var(--lue-ink)!important}
.lue-root a.lue-pill,.lue-root a.lue-btn{color:#fff!important}
.lue-root a.lue-btn-ghost{color:var(--lue-ink)!important}
.lue-root h2,.lue-root h3,.lue-root h4{color:var(--lue-ink)!important}
.lue-root .lue-sub{color:var(--lue-lav)!important}
.lue-root .lue-ex-info h2 span,.lue-root .lue-ex-card h3 span{color:var(--lue-lav)!important}

/* Roomier buttons (!important so the site theme cannot shrink the padding) */
.lue-root .lue-btn{padding:15px 38px!important;line-height:1.3!important;min-height:52px}
.lue-root .lue-btn-big{padding:18px 52px!important;font-size:1.15rem;min-height:60px}
.lue-root .lue-opt{padding:13px 28px!important;line-height:1.4!important}
.lue-root .lue-g-btn{padding:13px 28px!important;line-height:1.4!important}
.lue-root .lue-tab{padding:11px 26px!important;line-height:1.3!important}
.lue-root .lue-ex-views button{padding:11px 26px!important;line-height:1.3!important}
.lue-root .lue-ex-pick{padding:8px 22px 8px 10px!important;line-height:1.3!important}
.lue-root .lue-ex-controls button{padding:0 20px!important;line-height:1!important}
.lue-root .lue-lang button{padding:8px 16px!important;line-height:1.2!important}
.lue-root .lue-pill{padding:8px 28px 8px 8px!important;height:auto;min-height:62px}
.lue-root .lue-related-list{gap:14px}

/* Spacing that the paragraph reset above would otherwise cancel */
.lue-root .lue-lead{margin:0 0 30px}
.lue-root .lue-hero-center .lue-lead{margin:0 auto 30px}
.lue-root .lue-hero-compact .lue-lead{margin-bottom:12px}
.lue-root .lue-note{margin-top:16px}
.lue-root .lue-ex-scale{margin-top:12px}

/* Buttons that sit on top of the moving 3D view must not use live blur (it is slow) */
.lue-root .lue-ex-rotate{backdrop-filter:none;-webkit-backdrop-filter:none;background:rgba(30,26,92,.82)}

/* Small 3D models on the black hole and galaxy pages */
.lue-s3-canvas{position:absolute;inset:0;width:100%;height:100%;display:block;touch-action:none;cursor:grab;outline-offset:-4px}
.lue-s3-canvas:active{cursor:grabbing}
.lue-bh.is-3d{height:clamp(300px,52vw,460px)}
.lue-bh.is-3d .lue-bh-disk,.lue-bh.is-3d .lue-bh-hole,.lue-bh.is-3d .lue-bh-ship{display:none}
.lue-gal3d{display:none;position:relative;width:100%;aspect-ratio:1;max-width:520px;margin:0 auto;border-radius:28px;overflow:hidden;background:radial-gradient(circle at 50% 50%,rgba(100,80,235,.28),rgba(10,9,40,.2) 70%)}
.lue-gal-art.is-3d .lue-gal3d{display:block}
.lue-gal-art.is-3d>div[data-lue-panel]{display:none!important}
.lue-gal3d .lue-ex-controls{top:10px;right:10px}
.lue-gal-pin{position:absolute;left:0;top:0;display:flex;align-items:center;gap:6px;font-size:.8rem;font-weight:700;white-space:nowrap;pointer-events:none;will-change:transform}
.lue-gal-pin i{width:11px;height:11px;border-radius:50%;background:var(--lue-sun);box-shadow:0 0 0 4px rgba(255,194,58,.35)}
.lue-gal-pin b{background:rgba(14,12,50,.85);padding:2px 9px;border-radius:99px;font-weight:700}

/* Info card: small, fixed in the top-left corner, hidden on phones (the panel below shows the same facts) */
.lue-root .lue-ex-card,.lue-root .lue-ex-card.is-fixed{left:14px;top:14px;bottom:auto;width:min(250px,34%);max-width:none;padding:10px 14px;font-size:.8rem;line-height:1.4;transform:none!important;will-change:auto}
.lue-root .lue-ex-card h3{font-size:.82rem;margin:0 0 4px}
.lue-root .lue-ex-card ul{gap:2px}
@media (max-width:760px){.lue-root .lue-ex-card{display:none}}

/* Planet-order game: names must fit inside their boxes */
.lue-g-slots{grid-template-columns:repeat(auto-fill,minmax(190px,1fr))}
.lue-g-slot{display:grid;grid-template-columns:auto auto minmax(0,1fr);align-items:center;gap:8px;padding:8px 14px;min-height:60px;text-align:left}
.lue-g-slot small{min-width:1.1em;text-align:center}
.lue-g-slot span,.lue-g-btn span{min-width:0;overflow-wrap:anywhere}
.lue-g-btn{min-width:0}
.lue-g-slot .lue-pdot,.lue-g-btn .lue-pdot{width:34px;height:34px;margin:0 8px 0 6px;box-shadow:inset -5px -5px 10px rgba(0,0,0,.45)}
.lue-g-slot .lue-pdot-saturn::after,.lue-g-btn .lue-pdot-saturn::after{border-width:2px}

/* Headings: breathing room above and below (the paragraph/heading reset had removed it) */
.lue-root h2,.lue-root h3,.lue-root h4{line-height:1.3}
.lue-root .lue-sub{margin:38px 0 16px}
.lue-root .lue-section>h2{margin:0 0 22px}
.lue-root .lue-g-title{margin:0 0 8px}
.lue-root .lue-card h3,.lue-root .lue-card h4{margin:0 0 8px}
.lue-root .lue-step h4,.lue-root .lue-bh-text h4{margin:0 0 6px}