:root{--bg:#f6f7f9;--surface:#fff;--text:#1f2328;--text-secondary:#656d76;--border:#e1e4e8;--accent:#2563eb;--accent-weak:#2563eb1a;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;font-family:system-ui,Segoe UI,Roboto,PingFang SC,Microsoft YaHei,sans-serif;line-height:1.6}*{box-sizing:border-box}body{min-height:100vh;padding-bottom:env(safe-area-inset-bottom);margin:0}#app-nav{z-index:20;padding:6px 8px calc(6px + env(safe-area-inset-bottom));-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-top:1px solid var(--border);background:#fffffff0;gap:2px;display:flex;position:fixed;bottom:0;left:0;right:0}#app-nav a{color:var(--text-secondary);text-align:center;white-space:nowrap;border-radius:8px;flex:1;padding:8px 2px;font-size:12px;text-decoration:none}#app-nav a.active{color:#fff;background:var(--accent);font-weight:600}#app{max-width:720px;padding:24px 16px calc(72px + env(safe-area-inset-bottom));margin:0 auto}.page{flex-direction:column;gap:16px;display:flex}.page-header{justify-content:space-between;align-items:center;gap:12px;display:flex}.page-header h1{margin:0;font-size:22px}.btn-primary{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:8px;padding:8px 16px;font-size:14px}.btn-primary:hover{opacity:.9}.empty{color:var(--text-secondary);text-align:center;padding:40px 0}.error-list{flex-direction:column;gap:10px;margin:0;padding:0;list-style:none;display:flex}.error-item{background:var(--surface);border:1px solid var(--border);border-radius:10px;overflow:hidden}.error-link{color:inherit;padding:14px 16px;text-decoration:none;display:block}.error-link:hover{background:var(--accent-weak)}.question{-webkit-line-clamp:2;-webkit-box-orient:vertical;margin-bottom:6px;font-size:15px;display:-webkit-box;overflow:hidden}.meta{color:var(--text-secondary);font-size:12px}.btn-secondary{border:1px solid var(--border);background:var(--surface);color:var(--text);cursor:pointer;border-radius:8px;padding:8px 16px;font-size:14px}.btn-secondary:hover{background:var(--accent-weak)}.btn-danger{color:#fff;cursor:pointer;background:#dc2626;border:none;border-radius:8px;padding:8px 16px;font-size:14px}.btn-danger:hover{opacity:.9}.step-hint{color:var(--text-secondary);margin:4px 0;font-size:13px}.settings{background:var(--surface);border:1px solid var(--border);border-radius:10px;margin-bottom:16px;padding:12px}.settings summary{cursor:pointer;color:var(--text-secondary);font-size:14px}.settings-body{flex-direction:column;gap:10px;margin-top:12px;display:flex}.settings-body input,.form textarea{border:1px solid var(--border);box-sizing:border-box;border-radius:8px;width:100%;padding:8px 10px;font-family:inherit;font-size:14px}.settings-body input:focus,.form textarea:focus{border-color:var(--accent);outline:none}.media-picker{flex-wrap:wrap;align-items:center;gap:12px;display:flex}.preview-image{border:1px solid var(--border);border-radius:10px;max-width:100%;max-height:420px}.meta-row{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.inline-label{color:var(--text-secondary);font-size:14px}.form{flex-direction:column;gap:12px;display:flex}.field{flex-direction:column;gap:6px;display:flex}.form textarea{resize:vertical;min-height:72px}.field-label,.inline-label{color:var(--text-secondary);font-size:13px}.warning-label{color:#b45309;font-size:13px;font-weight:600}.notice-warning{color:#92400e;background:#fffbeb;border:1px solid #fde68a;border-radius:8px;padding:10px 12px;font-size:13px}.form-error{color:#b91c1c;font-size:14px}.form details{border:1px solid var(--border);border-radius:8px;padding:8px 12px}.practice-block{flex-direction:column;gap:12px;margin-top:8px;display:flex}.practice-block h2{margin:0;font-size:18px}.practice-actions{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.practice-count{color:var(--text-secondary);font-size:14px}.practice-list{flex-direction:column;gap:12px;display:flex}.practice-card-body{flex-direction:column;gap:10px;padding:14px 16px;display:flex}.tag{color:var(--accent);background:var(--accent-weak);border-radius:6px;align-self:flex-start;padding:2px 8px;font-size:12px}.practice-answer{margin:0;font-size:14px}.practice-explanation{color:var(--text-secondary);margin:0;font-size:13px}.practice-result{color:var(--accent);font-size:13px}.practice-pick{justify-content:space-between;align-items:center;gap:12px;padding:14px 16px;display:flex}.practice-pick.selected{border-color:var(--accent);background:var(--accent-weak)}.knowledge-list{flex-direction:column;gap:10px;margin-top:16px;display:flex}.knowledge-card{border:1px solid var(--border);border-radius:12px;flex-direction:column;gap:10px;padding:12px 14px;display:flex}.knowledge-head{justify-content:space-between;align-items:center;gap:10px;display:flex}.knowledge-name{overflow-wrap:anywhere;font-size:15px;font-weight:600}.knowledge-badge{color:var(--accent);background:var(--accent-weak);white-space:nowrap;border-radius:999px;flex-shrink:0;padding:2px 10px;font-size:12px}.knowledge-category{color:var(--text-secondary);font-size:13px}.knowledge-actions{flex-wrap:wrap;align-items:center;gap:8px;display:flex}.knowledge-edit{flex-direction:column;gap:8px;margin-top:12px;display:flex}.knowledge-edit input,.knowledge-actions input{border:1px solid var(--border);border-radius:8px;flex:1;min-width:120px;padding:8px 10px;font-size:14px}