:root{--bg:#f6f7f9;--panel:#fff;--text:#18212f;--muted:#677084;--line:#dde2ea;--brand:#0b7c6b;--brand-dark:#075c50;--accent:#315fbd;--danger:#b42318;--warn:#9a5b00}*{box-sizing:border-box}body,html{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}.shell{width:min(100%,980px);margin:0 auto;padding:18px 14px 72px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px}.brand{flex:0 0 auto;font-size:20px;font-weight:750;line-height:1.15}.nav{display:flex;gap:7px;flex-wrap:wrap;justify-content:flex-end}.button,.nav a,button{border:0;border-radius:8px;background:var(--brand);color:#fff;min-height:40px;padding:0 14px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer}.button.secondary,.nav a.secondary,button.secondary{border:1px solid var(--line);background:hsla(0,0%,100%,.88);color:var(--text)}button.nav-logout{border:1px solid var(--line);background:hsla(0,0%,100%,.82);color:var(--muted)}.button.danger,button.danger{background:var(--danger)}.panel{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:16px}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));grid-gap:12px;gap:12px}.course-hero{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:14px;border-color:rgba(11,124,107,.16);background:linear-gradient(135deg,#fff,#f2faf8)}.course-hero h1{margin:6px 0}.ecosystem-hero{display:grid;grid-gap:10px;gap:10px;margin-bottom:14px;border-color:rgba(11,124,107,.16);background:linear-gradient(135deg,#fff,#f7fbfa)}.ecosystem-hero h1{margin:0;font-size:clamp(27px,6vw,42px);letter-spacing:0}.ecosystem-hero 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a.active{border-color:rgba(11,124,107,.45);background:#eef7f5;color:var(--brand-dark);font-weight:700}.admin-tabs{display:flex;gap:8px;overflow-x:auto;padding:8px;margin-bottom:14px;border:1px solid var(--line);border-radius:8px;background:#fff}.admin-tabs a{flex:0 0 auto;min-height:36px;border-radius:7px;padding:0 12px;display:inline-flex;align-items:center;color:var(--text);background:#f4f6f8}.admin-tabs a:hover{background:#eef7f5;color:var(--brand-dark)}.admin-course-card h2,.admin-section h2{margin:4px 0}.admin-course-card summary,.section-subtitle,.section-title{display:flex;align-items:center;justify-content:space-between;gap:12px}.section-subtitle{padding-top:6px;border-top:1px solid var(--line)}.admin-course-card summary{list-style:none;cursor:pointer}.admin-course-card summary::-webkit-details-marker{display:none}.admin-course-card summary:before{content:"展开";order:3;color:var(--muted);font-size:13px}.admin-course-card[open] 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summary:before{order:0}.admin-course-actions{justify-content:flex-start}.admin-course-edit,.lesson-row{grid-template-columns:1fr}.admin-cover-preview{max-width:100%}.row{align-items:flex-start;flex-direction:column}}