@import"https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800&family=Noto+Sans+SC:wght@400;500;700;900&display=swap";:root{--bg-app: #f4f6f8;--bg-sidebar: #ffffff;--bg-card: #ffffff;--bg-hover: #f0f2f5;--bg-active: #e6f4ff;--text-main: #1f2937;--text-muted: #6b7280;--text-inverse: #ffffff;--primary: #1890ff;--primary-hover: #40a9ff;--primary-light: #e6f4ff;--primary-border: #91d5ff;--accent: #ff4d4f;--accent-hover: #ff7875;--accent-light: #fff1f0;--success: #52c41a;--warning: #faad14;--border-light: #e5e7eb;--border-focus: #91d5ff;--radius-sm: 6px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--shadow-soft: 0 2px 12px rgba(0, 0, 0, .04);--shadow-float: 0 8px 32px rgba(0, 0, 0, .08)}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;font-family:Nunito,Noto Sans SC,sans-serif;color:var(--text-main);background-color:var(--bg-app);overflow:hidden}.app-container{display:flex;height:100vh;width:100vw}.sidebar{width:260px;background:var(--bg-sidebar);border-right:1px solid var(--border-light);display:flex;flex-direction:column;padding:24px 16px;flex-shrink:0;z-index:10}.brand{display:flex;align-items:center;gap:12px;padding:0 12px;margin-bottom:32px}.brand-icon{width:36px;height:36px;background:linear-gradient(135deg,var(--accent),#ff7875);border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;box-shadow:0 4px 12px #ff4d4f4d}.brand h1{font-size:1.15rem;font-weight:800;letter-spacing:-.02em}.nav-group{margin-bottom:24px}.nav-group-title{font-size:.75rem;font-weight:700;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;padding:0 12px;margin-bottom:8px}.nav-item{display:flex;align-items:center;gap:12px;width:100%;padding:10px 12px;border:none;background:transparent;border-radius:var(--radius-sm);color:var(--text-muted);font-family:inherit;font-size:.9rem;font-weight:600;cursor:pointer;transition:all .2s ease;text-align:left}.nav-item:hover{background:var(--bg-hover);color:var(--text-main)}.nav-item.active{background:var(--primary-light);color:var(--primary)}.nav-item.active svg{color:var(--primary)}.nav-item:disabled{opacity:.5;cursor:not-allowed}.main-area{flex:1;display:flex;flex-direction:column;position:relative;overflow:hidden}.topbar{height:64px;display:flex;align-items:center;justify-content:space-between;padding:0 32px;background:var(--bg-card);border-bottom:1px solid var(--border-light);z-index:5}.breadcrumb{display:flex;align-items:center;gap:8px;font-weight:600;font-size:1rem}.breadcrumb-muted{color:var(--text-muted)}.btn-config{display:flex;align-items:center;gap:8px;padding:8px 16px;background:var(--bg-app);border:1px solid var(--border-light);border-radius:999px;color:var(--text-main);font-weight:600;font-size:.85rem;cursor:pointer;transition:all .2s}.btn-config:hover{border-color:var(--primary-border);color:var(--primary)}.content-scroll{flex:1;overflow-y:auto;padding:32px}.content-wrapper{max-width:1000px;margin:0 auto;padding-bottom:60px}.page-header{margin-bottom:24px;display:flex;justify-content:space-between;align-items:flex-end}.page-header h2{font-size:1.75rem;font-weight:800;margin-bottom:4px}.page-header p{color:var(--text-muted);font-size:.95rem}.card{background:var(--bg-card);border:1px solid var(--border-light);border-radius:var(--radius-md);padding:24px;box-shadow:var(--shadow-soft);margin-bottom:24px}.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.form-row{margin-bottom:20px}.form-row label{display:block;font-size:.85rem;font-weight:700;margin-bottom:8px;color:var(--text-main)}.input-field{width:100%;padding:10px 14px;border:1px solid var(--border-light);border-radius:var(--radius-sm);background:var(--bg-card);font-family:inherit;font-size:.95rem;color:var(--text-main);transition:all .2s}.input-field:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}textarea.input-field{min-height:80px;resize:vertical}.btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--primary);color:#fff;border:none;padding:10px 20px;border-radius:var(--radius-sm);font-size:.95rem;font-weight:600;cursor:pointer;transition:all .2s}.btn-primary:hover{background:var(--primary-hover)}.btn-primary:disabled{background:#d9d9d9;cursor:not-allowed}.btn-ghost{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:transparent;color:var(--text-main);border:1px solid var(--border-light);padding:10px 20px;border-radius:var(--radius-sm);font-size:.95rem;font-weight:600;cursor:pointer;transition:all .2s}.btn-ghost:hover{background:var(--bg-hover)}.badge{display:inline-block;padding:4px 8px;border-radius:4px;font-size:.75rem;font-weight:700;background:var(--bg-hover);color:var(--text-muted)}.badge.accent{background:var(--accent-light);color:var(--accent)}.badge.success{background:#f6ffed;color:var(--success);border:1px solid #b7eb8f}.tag-list{display:flex;flex-wrap:wrap;gap:8px}.tag{background:var(--bg-hover);border:1px solid var(--border-light);padding:4px 10px;border-radius:12px;font-size:.8rem;color:var(--text-muted)}.topic-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.topic-card{background:var(--bg-card);border:1px solid var(--border-light);border-radius:var(--radius-md);padding:20px;display:flex;flex-direction:column;transition:all .2s}.topic-card:hover{border-color:var(--primary-border);box-shadow:var(--shadow-soft)}.topic-card h4{font-size:1.1rem;font-weight:700;margin-bottom:8px;line-height:1.4}.topic-card p{font-size:.85rem;color:var(--text-muted);margin-bottom:16px;flex:1}.editor-section{border-left:3px solid var(--border-light);padding-left:20px;margin-bottom:32px;position:relative}.editor-section.active{border-color:var(--primary)}.editor-section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}.editor-section-header h3{font-size:1.1rem;font-weight:700}.result-box{background:var(--bg-app);border:1px solid var(--border-light);border-radius:var(--radius-sm);padding:16px;font-size:.95rem;line-height:1.6;white-space:pre-wrap;position:relative}.result-box.generating{opacity:.6;pointer-events:none}.cover-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.cover-item{aspect-ratio:3/4;background:var(--bg-hover);border-radius:var(--radius-sm);display:flex;align-items:center;justify-content:center;border:1px solid var(--border-light);overflow:hidden;position:relative}.cover-item img{width:100%;height:100%;object-fit:cover}.cover-item .overlay{position:absolute;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;flex-direction:column;align-items:center;justify-content:center;color:#fff;opacity:0;transition:opacity .2s}.cover-item:hover .overlay{opacity:1}.drawer-backdrop{position:absolute;top:0;right:0;bottom:0;left:0;background:#0006;z-index:100}.drawer{position:absolute;top:0;right:0;bottom:0;width:440px;background:var(--bg-card);box-shadow:-4px 0 24px #0000001a;z-index:101;display:flex;flex-direction:column}.drawer-header{padding:20px 24px;border-bottom:1px solid var(--border-light);display:flex;justify-content:space-between;align-items:center}.btn-icon{background:transparent;border:none;color:var(--text-muted);cursor:pointer;padding:6px;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .2s}.btn-icon:hover{background:var(--bg-hover);color:var(--text-main)}.drawer-body{flex:1;overflow-y:auto;padding:24px}.drawer-footer{padding:20px 24px;border-top:1px solid var(--border-light);background:var(--bg-app)}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px 20px;text-align:center;color:var(--text-muted);background:var(--bg-card);border:1px dashed var(--border-light);border-radius:var(--radius-md)}.empty-state svg{margin-bottom:16px;opacity:.5}