:root{--ink:#253c39;--muted:#6a7773;--coral:#e66d4c;--cream:#fbf7ee;--yellow:#f9d878;--line:#e3e8df;--blue:#4b76b9;--green:#325e4d}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font:14px/1.7 'Be Vietnam Pro',Arial,sans-serif;background:#fff}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button,a{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit;text-decoration:none}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--blue);outline-offset:4px}button:disabled{cursor:not-allowed;opacity:.5}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(38px,4.5vw,66px);line-height:1.16;letter-spacing:-2.7px;font-weight:800}h2{font-size:clamp(27px,3vw,39px);line-height:1.3;letter-spacing:-1.3px}h3{font-size:20px;line-height:1.4}p{color:var(--muted)}.pilot-banner{text-align:center;font-size:10px;letter-spacing:1.2px;background:var(--ink);color:white;padding:7px 16px}.pilot-banner span{color:#d7e4db;margin-left:20px;letter-spacing:.1px}header{max-width:1320px;margin:auto;display:flex;align-items:center;justify-content:space-between;gap:24px;padding:22px 5%}.brand{font-size:25px;font-weight:700;line-height:1.1;display:flex;gap:11px;align-items:center;white-space:nowrap}.brand b{color:var(--coral)}.brand small{display:block;font-size:7px;letter-spacing:1.6px;margin-top:8px}.brand-icon{background:var(--coral);border-radius:14px;color:white;font-size:35px;width:46px;height:48px;text-align:center;font-weight:800;position:relative}.brand-icon span{font-size:10px;position:absolute;right:5px;bottom:6px}nav,.header-actions{display:flex;align-items:center;gap:25px;font-size:12px;font-weight:600}.header-actions{gap:17px}.outline,.primary,.secondary{padding:13px 23px;border-radius:9px;border:1px solid var(--line);background:#fff;color:var(--ink);font-weight:600}.primary{background:var(--coral);color:white;border-color:var(--coral);box-shadow:0 5px 0 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.primary{width:100%}.dialog-close{position:absolute;right:14px;top:7px;border:0;background:none;font-size:27px;color:var(--muted)}#auth-error{color:#a63b28}#toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);max-width:90vw;background:var(--ink);color:#fff;border-radius:10px;padding:15px 22px;font-size:12px;z-index:9;display:none}#toast.visible{display:block}.hidden{display:none!important}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}@media(max-width:1000px){nav{gap:14px}.tutor-link{display:none}.hero-inner{gap:20px}.hero-notes{flex-direction:column;gap:3px}.search-panel{grid-template-columns:repeat(2,1fr)}.search-panel button{grid-column:span 2}.lab-grid{grid-template-columns:repeat(2,1fr)}.art{min-height:350px}.board .formula{font-size:32px}.graph{width:95px}}@media(max-width:720px){.pilot-banner{font-size:8px}.pilot-banner span{display:block;margin:2px 0 0}header{padding:17px 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/* User-supplied mascot: display the bottom-left green icon without changing the artwork. */
.brand-mascot{display:inline-block;position:relative;flex:0 0 48px;width:48px;height:48px;border-radius:13px;overflow:hidden;background:#11633d}.brand-mascot img{position:absolute;width:446.512%;max-width:none;height:auto;left:-29.651%;top:-194.674%;display:block}.brand-footer-art{width:100%;background:#faf6ed;line-height:0}.brand-footer-art>img{display:block;width:100%;height:auto}.brand-footer-art{margin-bottom:0}@media(max-width:720px){.brand-mascot{flex-basis:40px;width:40px;height:40px;border-radius:11px}.brand-footer-art{padding-bottom:85px}}

/* Full supplied wordmark replaces the old icon + text lockup. */
.brand-art{display:inline-flex;align-items:center;flex-shrink:0;width:205px;line-height:0}.brand-art>img{display:block;width:100%;height:auto;max-height:78px;object-fit:contain}footer .brand-art{width:230px}@media(max-width:720px){.app-header .brand-art{width:153px}.brand-art>img{max-height:62px}footer .brand-art{width:210px}}