@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{--bg:#f6f7f1;--paper:#fff;--ink:#213d30;--muted:#6b796d;--green:#35684a;--dark:#264d39;--lime:#e1eeac;--border:#e0e6da;--soft:#edf1e5;--blue:#548aab;--coral:#c87858;--serif:Georgia,serif;--shadow:0 16px 45px #233d2c08}
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@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-7px)}}@keyframes sway{0%,100%{transform:rotate(-1deg)}50%{transform:rotate(1.4deg)}}@keyframes breathe{0%,100%{opacity:.45}50%{opacity:1}}@keyframes sunturn{to{transform:rotate(360deg)}}@keyframes waterflow{to{stroke-dashoffset:-112}}@keyframes enter{from{opacity:0;transform:translateY(7px)}to{opacity:1;transform:translateY(0)}}
@media(min-width:1450px){.hero h1{font-size:66px}.hero{min-height:395px}.hero-visual svg{max-height:410px}.topic-card{min-height:185px}.hero-copy>p{font-size:16px;max-width:430px}.topbar,main,footer{padding-left:55px;padding-right:55px}}
@media(max-width:1150px){.sidebar{width:210px;padding:30px 15px}.shell{margin-left:210px}.topbar,main,footer{padding-left:28px;padding-right:28px}.hero h1{font-size:48px}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.topic-card{min-height:150px}.topic-top{margin-bottom:17px}.home-bottom{grid-template-columns:1fr}.note-one{right:-10px}.learn-grid{grid-template-columns:1.4fr 1fr}.lab-content{padding:25px}.step-dots:after{display:none}#toast{left:calc(50% + 105px)}}
@media(max-width:800px){.sidebar{position:static;width:100%;padding:18px 20px 0;border-right:0;border-bottom:1px solid var(--border)}.brand{font-size:24px;margin:0 0 17px;gap:10px}.brand-icon{height:32px;width:30px;font-size:24px}.brand small{font-size:7px;margin-top:7px}.nav-label,.sidebar-bottom{display:none}nav{display:flex;overflow-x:auto;gap:4px;margin:0 -20px;padding:0 15px 11px;scrollbar-width:none}nav a{white-space:nowrap;font-size:11px;padding:9px 10px;gap:6px}nav a>span{font-size:15px;width:15px}.shell{margin-left:0}.topbar{padding:13px 22px;min-height:55px}.topbar .course{font-size:9px;letter-spacing:1px}.search-text{display:none}.search-button kbd{display:none}.header-actions{gap:15px}main{padding:24px 22px 30px}.hero{min-height:310px}.hero h1{font-size:44px}.hero-copy{padding-top:10px}.hero-copy>p{font-size:13px;max-width:320px}.hero-visual{min-height:310px}.float-note{font-size:9px;padding:7px 9px}.float-note b{font-size:10px}.note-one{right:0;top:26px}.note-two{left:0;bottom:65px}.hero-actions{gap:15px}.hero-actions .text-button{font-size:11px}.hero-actions .btn{font-size:11px;padding:11px 14px}.hero-visual:before{width:250px;height:250px}.section-head{margin-top:25px}.learn-grid{grid-template-columns:1fr}.terms-panel{display:grid;grid-template-columns:1fr 1fr;gap:0 22px}.terms-panel h3{grid-column:1/-1}.lesson-head{flex-direction:column;gap:15px}.lesson-title h1{font-size:30px}.lab{grid-template-columns:1fr}.lab-visual{min-height:320px;padding:15px 35px 45px}.lab-visual svg{max-height:295px}.lab-content{border-left:0;border-top:1px solid var(--border);min-height:310px}.lab-content h2{font-size:25px}.lab-content .btn{margin-top:15px}.step-dots{margin-bottom:14px}.step-dots:after{display:block}.quick-grid{grid-template-columns:1fr 1fr}.page-intro h1{font-size:32px}.quiz-setup,.quiz-card,.result-panel{padding:26px}.quiz-card h2{font-size:23px}.flash-face{padding:28px}.flash-face h2{font-size:25px}.flash-face.back p{font-size:18px}footer{padding:20px 22px;gap:15px}footer .save-note{width:100%;margin:0}#toast{left:50%}}
@media(max-width:540px){.hero{grid-template-columns:1fr}.hero-copy{padding-bottom:0}.hero h1{font-size:45px;max-width:350px}.hero-copy>p{max-width:340px;margin:16px 0 20px}.hero-visual{min-height:260px;max-height:290px;margin-top:10px}.hero-visual svg{max-height:290px}.hero-visual:before{width:290px;height:260px}.note-one{right:10px;top:35px}.note-two{left:8px;bottom:35px}.topic-grid{gap:10px}.topic-card{padding:18px 14px;min-height:153px}.topic-card h3{font-size:13px}.topic-card p{font-size:10px;max-width:115px}.topic-top{margin-bottom:20px}.section-head h2{font-size:21px}.section-head .meta{display:none}.study-banner{padding:21px;gap:15px}.study-banner h3{font-size:16px}.banner-icon{display:none}.study-banner .btn{font-size:10px;padding:9px 11px}.learn-grid{gap:15px}.essential{padding:21px}.essential li{font-size:13px}.terms-panel{display:block}.lesson-tabs{gap:6px}.chip{font-size:10px;padding:6px 9px}.lesson-title h1{font-size:29px}.lesson-bottom{align-items:stretch;gap:10px}.lesson-bottom .btn{font-size:10px;padding:10px}.page-intro h1{font-size:31px}.page-intro p{font-size:13px}.flashcard{height:350px}.flash-face h2{font-size:23px}.flash-face.back p{font-size:17px}.flash-actions .btn{gap:10px}.card-footer{font-size:10px}.toolbar{gap:12px}.quiz-setup,.quiz-card,.result-panel{padding:23px 19px}.option{padding:12px;font-size:12px;gap:10px}.quiz-card h2{font-size:22px}.quiz-topline{font-size:10px}.lab-visual{padding:15px 15px 50px}.lab-content{padding:24px 21px}.lab-content p{font-size:13px}.flow-node{padding:15px 10px;font-size:12px}.flow-node b{font-size:18px}.cycle .flow-node b{font-size:17px}.quick-grid{grid-template-columns:1fr}.exam-item summary{padding:17px 16px;gap:10px;font-size:13px}.exam-inner{padding:0 16px 19px}.exam-item summary .q-number{min-width:16px}.exam-buttons{gap:12px}.exam-buttons .text-button{font-size:11px}.score{font-size:65px}.search-result p{line-height:1.6}}
.flip-inner{display:block}.flashcard.flipped .flip-inner{animation:cardturn .45s ease-out}.flow-node.selected{animation:focusnode .45s ease-out}.quit-quiz{margin-top:25px;font-size:11px}.result-panel .hero-actions{margin-bottom:25px}[hidden]{display:none!important}
@keyframes cardturn{from{transform:rotateY(0)}to{transform:rotateY(180deg)}}@keyframes focusnode{from{opacity:.4;transform:scale(.97)}to{opacity:1;transform:scale(1.025)}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition-duration:.01s!important;scroll-behavior:auto!important}}