:root{font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;color:#263d36;background:#f7f8f4;font-size:14px;--green:#244e42;--deep:#173e34;--muted:#768376;--border:#e5e9e1;--cream:#f0f0db;--gold:#cfb67a}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit;border:0;background:none}button:disabled{cursor:not-allowed;opacity:.55}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #8bbbad;outline-offset:4px}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-weight:600}p{line-height:1.8}.app-shell{display:flex;min-height:100vh}.sidebar{width:226px;padding:32px 20px 20px;background:#f0f3eb;border-right:1px solid #e0e6da;position:fixed;inset:0 auto 0 0;display:flex;flex-direction:column;z-index:30;overflow:auto}.brand{display:flex;gap:11px;align-items:center;padding:0 8px 36px}.brand-mark{display:grid;place-items:center;width:42px;height:44px;color:#f1f2dd;background:#244e42;border-radius:12px 12px 12px 2px;font:25px "Songti SC",serif}.brand strong{font-family:"Songti SC",STSong,serif;font-size:25px;letter-spacing:1px;color:#254a3b}.brand strong span{font-size:15px;margin-left:5px}.brand small{display:block;font-size:7px;letter-spacing:1.3px;margin-top:5px;color:#6f8270}.sidebar-label{font-size:10px;color:#879080;padding:9px 14px 13px;letter-spacing:1px}.sidebar nav{display:flex;flex-direction:column;gap:7px}.sidebar nav button,.sidebar nav a{padding:14px;display:flex;gap:12px;align-items:center;font-size:13px;color:#748073;border-radius:7px;text-align:left}.sidebar nav small{margin-left:auto}.sidebar nav .active{color:#f8f9ee;background:#284f42}.sidebar nav button:hover:not(.active),.sidebar nav a:hover{background:#e5ebdf}.side-note{background:#e8edde;border:1px solid #dfe5d5;border-radius:9px;padding:22px 18px;margin:70px 6px 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scaleX(.4)}.formula{font-family:Georgia,serif;font-style:italic;font-size:66px;color:#d7d9b4;position:absolute;left:34%;top:105px}.dot{width:14px;height:14px;background:#d5bd81;border-radius:50%;position:absolute;left:29%;top:45px;box-shadow:0 0 35px #ddca9677}.art-note{position:absolute;left:24%;bottom:35px;font-size:7px;color:#b5c0a8;letter-spacing:3px}.button{padding:13px 18px;display:inline-flex;align-items:center;justify-content:center;gap:18px;border-radius:7px;font-size:12px;font-weight:500;transition:.18s;white-space:nowrap;border:1px solid transparent}.button:hover:not(:disabled){transform:translateY(-1px);filter:brightness(1.06)}.button.dark{background:var(--green);color:#fff}.button.cream{background:#eef0d6;color:#244738;border-color:#eef0d6}.button.outline{background:transparent;border-color:#d9e1d4}.button.full{width:100%}.stats{display:grid;grid-template-columns:1fr 1fr 1fr 1.25fr;border:1px solid var(--border);background:#fcfdf9;border-radius:10px;margin:22px 0 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@media(min-width:1550px){.hero{min-height:320px}.hero-art{inset:10px 0 0 55%}.subject-cover{height:175px}}@media(max-width:1150px){.sidebar{width:195px;padding:30px 14px}.main-shell{margin-left:195px;width:calc(100% - 195px)}main{padding:30px 25px 0}header{padding:0 25px}.subject-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.stats{grid-template-columns:1fr 1fr 1fr}.stats-note{display:none}.quiz-layout{grid-template-columns:minmax(0,1fr) 190px}.question{padding:24px}.hero{padding:32px}.hero-art{left:55%}.orbit{left:4%}.formula{left:25%}.art-note{left:0;font-size:6px}footer{margin-left:25px;margin-right:25px}}@media(max-width:800px){.sidebar{position:static;width:100%;padding:18px 20px;border-right:0;border-bottom:1px solid var(--border);overflow:visible}.app-shell{display:block}.brand{padding:0 0 18px}.brand-mark{width:34px;height:36px;font-size:22px}.brand strong{font-size:22px}.brand small{font-size:6px}.sidebar-label,.side-note,.side-foot{display:none}.sidebar nav{flex-direction:row;gap:6px}.sidebar nav button,.sidebar nav a{padding:11px 13px;gap:8px;font-size:12px}.main-shell{margin:0;width:100%}header{height:58px;padding:0 20px}.breadcrumb{font-size:10px}.account{font-size:11px}main{padding:25px 20px 0}.page-heading h1,.quiz-heading h1{font-size:25px}.page-heading p{font-size:11px}.hero{min-height:270px;padding:28px}.hero h2{font-size:28px}.hero-art{left:53%;opacity:.7}.hero-art .orbit{width:170px;height:170px;top:45px}.formula{font-size:50px;left:24%;top:105px}.art-note{display:none}.stats>div{padding:0 16px}.stats strong{font-size:24px}.quiz-layout{grid-template-columns:1fr}.answer-sheet{order:-1;padding:18px}.answer-sheet .eyebrow,.answer-sheet h3,.answer-sheet .info-box,.answer-sheet>#finish{display:none}.answer-sheet .muted{margin-bottom:8px}.question-numbers{grid-template-columns:repeat(10,1fr);gap:6px;margin:14px 0 0}.question-numbers button{min-height:28px;aspect-ratio:auto;padding:6px 0}.stem{font-size:18px}.quiz-heading{margin-bottom:20px}.quiz-heading .button{padding:10px}.question-meta{gap:10px}.subject-grid{gap:15px}.subject-bottom{align-items:start;flex-direction:column;gap:8px}footer{margin:30px 20px 0}.wrong-item summary{flex-wrap:wrap}.wrong-item summary>small{margin-left:auto}}@media(max-width:480px){.hero-art{opacity:.3;left:47%}.hero h2{font-size:27px}.hero p{font-size:10px}.subject-grid{grid-template-columns:1fr}.subject-cover{height:135px}.subject-bottom{flex-direction:row;align-items:center}.stats{padding:20px 0;margin-bottom:30px}.stats>div{padding:0 15px}.stats strong{font-size:23px}.stats span{font-size:9px}.question{padding:20px 16px}.option{font-size:14px;padding:13px;gap:12px}.stem{font-size:17px}.question-numbers{grid-template-columns:repeat(5,1fr)}.quiz-heading h1{font-size:21px}.lang-label{font-size:0}.lang-label select{font-size:10px}.panel.setup{padding:23px}dialog{padding:30px 22px}.sidebar nav button,.sidebar nav a{font-size:11px;padding:10px}.page-heading h1{font-size:25px}.report{padding:35px 18px}footer span{display:none}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}

/* Keep the language control visible on desktop and mobile. */
header { gap: 16px; flex-wrap: wrap; }
header .breadcrumb { margin-right: auto; }
.interface-language { display: flex; align-items: center; gap: 8px; font-size: 13px; flex-shrink: 0; }
.interface-language select { font: inherit; color: #183e36; background: #fff; border: 1px solid #c9d2c6; border-radius: 7px; min-height: 40px; padding: 6px 10px; }
.interface-language select:focus-visible { outline: 2px solid #183e36; outline-offset: 3px; }
html[lang="en"] .subject-body h3 { display: flex; flex-wrap: wrap; gap: 8px; }
html[lang="en"] .subject-bottom { flex-wrap: wrap; gap: 12px; }
html[lang="en"] .question-meta { flex-wrap: wrap; gap: 12px; }
html[lang="en"] .subject-body p { min-height: 3.5em; height: auto; }
@media(max-width: 600px) {
  header { gap: 8px; }
  .interface-language > span { display: none; }
  header .account { margin-left: auto; }
  html[lang="en"] .question-actions { flex-wrap: wrap; gap: 10px; }
}

header { min-height: 78px; height: auto; padding-top: 12px; padding-bottom: 12px; }
.interface-language { flex-direction: row; }
html[lang="en"] .brand strong { font-size: 22px; }
html[lang="en"] .brand strong span { display: block; margin-left: 0; }