:root{--red:#d32f2f;--orange:#f57c00;--yellow:#fbc02d;--primary-brand:#f57c00;--dark-orange:#e65100;--bg:#fff9f5;--text:#333;color:var(--text);background:var(--bg);font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif}body{background:var(--bg);margin:0}button,select{font:inherit}main{text-align:center;flex-direction:column;align-items:center;padding:20px 15px;display:flex}.top-bar{box-sizing:border-box;justify-content:space-between;align-items:flex-start;width:100%;max-width:450px;margin-bottom:20px;padding:0 5px;display:flex}.top-left-group{flex:1;align-items:center;gap:12px;padding-right:15px;display:flex}.logo-link{flex-shrink:0;text-decoration:none;display:inline-block}.app-logo{width:65px;height:auto;display:block}.org-name{text-align:left;flex-direction:column;justify-content:center;display:flex}.org-name-zh{color:var(--primary-brand);margin-bottom:2px;font-size:19px;font-weight:900;line-height:1.2}.org-name-en{color:var(--primary-brand);font-size:11px;font-weight:700;line-height:1.2}.lang-selector{background:#e0e0e0;border-radius:12px;flex-direction:column;flex-shrink:0;gap:5px;padding:6px;display:flex;box-shadow:0 2px 5px #0000001a}.lang-btn{cursor:pointer;color:#555;background:0 0;border:0;border-radius:8px;padding:8px 12px;font-size:13px;font-weight:700}.lang-btn.active{background:var(--primary-brand);color:#fff}.header{width:100%;max-width:400px;margin-bottom:15px}.slogan-chars{color:var(--dark-orange);letter-spacing:2px;margin:0 0 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0;display:flex}.setup-guide{flex:1}.setup-guide,.what-is-guide,.faq-guide{box-sizing:border-box;background:#fff;border:1px solid #ccc;border-radius:8px;overflow:hidden}.setup-guide summary,.what-is-guide summary,.faq-guide summary{cursor:pointer;padding:15px;font-weight:700;list-style:none}.setup-guide .content,.what-is-guide .content,.faq-guide .content{text-align:left;padding:15px;font-size:13px;line-height:1.6}.setup-guide h3,.what-is-guide h3,.faq-guide h3{color:var(--primary-brand);font-size:14px}.install-btn-small{color:#111;cursor:pointer;background:#43e660;border:0;border-radius:8px;height:48px;padding:0 15px;font-size:14px;font-weight:700}.what-is-guide,.faq-guide{border:2px solid var(--primary-brand);width:100%;max-width:350px;margin-bottom:20px}.what-is-guide summary,.faq-guide summary{color:var(--dark-orange);text-align:center;background:#ffe0b2}.footer-linktree{width:100%;max-width:350px;margin:10px 0 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