:root{--red:#b92521;--ink:#282521;--muted:#7e7972;--paper:#faf8f3;--line:#e8e3da;--gold:#d9a951}*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.7}button,a,input,textarea{ -webkit-tap-highlight-color:transparent}button,input,textarea{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer}a{color:inherit;text-decoration:none}header{max-width:1080px;margin:auto;padding:22px 32px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center;font-weight:750;letter-spacing:2px}.brand 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18px;border-radius:5px;display:none;z-index:50;font-size:13px;width:max-content;max-width:90%}:focus-visible{outline:3px solid #d5a649;outline-offset:3px}@media(min-width:760px){.hero{padding:44px 48px}.hero h1 br{display:none}.courses .course:last-child{grid-column:1/-1}.shots .shot{max-width:440px}}@media(max-width:600px){header{padding:16px 20px}.edition{font-size:9px;letter-spacing:1px}main{padding:20px 18px 112px}.hero{padding:28px 24px}.hero h1{font-size:34px}.hero p{font-size:13px}.hero-bottom{gap:10px}.hero-bottom small{display:block}.progress-card{padding:17px;gap:15px}.courses{grid-template-columns:1fr}.course{padding:18px}.content{padding:20px 18px}.lesson-title h1{font-size:27px}.shot{min-width:140px}.shots{gap:10px}.quiz-item{padding:20px}.section-head h2{font-size:19px}.primary{flex:1}.actions button{min-height:48px}.quick-flow{gap:6px;font-size:11px}.quick-flow span{padding:6px 8px}}
