*{box-sizing:border-box;margin:0;padding:0}:root{--primary:#1a73e8;--primary-hover:#1557b0;--bg:#f5f7fa;--card-bg:#fff;--border:#e0e4e8;--text:#1a1a2e;--text-secondary:#6b7280;--success:#10b981;--danger:#ef4444;--radius:10px;--shadow:0 1px 3px #00000014;--shadow-lg:0 4px 12px #0000001a}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;line-height:1.6}.loading-screen{min-height:100vh;color:var(--text-secondary);flex-direction:column;justify-content:center;align-items:center;gap:16px;display:flex}.spinner{border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;width:36px;height:36px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.app{flex-direction:column;min-height:100vh;display:flex}.app-header{background:var(--card-bg);border-bottom:1px solid var(--border);height:56px;box-shadow:var(--shadow);z-index:100;justify-content:space-between;align-items:center;padding:0 24px;display:flex;position:sticky;top:0}.header-left{align-items:center;gap:24px;display:flex}.back-link{color:var(--text-secondary);white-space:nowrap;font-size:14px;text-decoration:none}.back-link:hover{color:var(--primary)}.app-title{cursor:pointer;color:var(--text);white-space:nowrap;font-size:18px;font-weight:700}.app-nav{gap:4px;display:flex}.nav-btn{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-radius:6px;padding:6px 14px;font-size:14px;transition:all .2s}.nav-btn:hover{color:var(--text);background:#f0f0f5}.nav-btn.active{color:var(--primary);background:#e8f0fe;font-weight:600}.header-right{align-items:center;gap:12px;display:flex}.user-name{color:var(--text-secondary);font-size:14px}.logout-btn{border:1px solid var(--border);background:var(--card-bg);color:var(--text-secondary);cursor:pointer;border-radius:6px;padding:4px 12px;font-size:13px;transition:all .2s}.logout-btn:hover{border-color:var(--danger);color:var(--danger)}.app-main{flex:1;width:100%;max-width:900px;margin:0 auto;padding:24px}.generator{flex-direction:column;gap:20px;display:flex}.generator-card{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}.generator-card h2{color:var(--text);margin-bottom:16px;font-size:16px}.doc-type-selector{flex-direction:column;gap:16px;display:flex}.category-section h3{color:var(--text-secondary);margin-bottom:8px;font-size:14px;font-weight:600}.type-chips{flex-wrap:wrap;gap:8px;display:flex}.type-chip{border:1.5px solid var(--border);background:var(--card-bg);color:var(--text);cursor:pointer;border-radius:20px;padding:6px 14px;font-size:13px;transition:all .2s}.type-chip:hover{border-color:var(--primary);color:var(--primary)}.type-chip.selected{background:var(--primary);border-color:var(--primary);color:#fff}.form-group{margin-bottom:16px}.form-group label{color:var(--text-secondary);margin-bottom:6px;font-size:13px;font-weight:600;display:block}.form-group textarea,.form-group input{border:1.5px solid var(--border);resize:vertical;border-radius:8px;width:100%;padding:10px 12px;font-family:inherit;font-size:14px;transition:border-color .2s}.form-group textarea:focus,.form-group input:focus{border-color:var(--primary);outline:none;box-shadow:0 0 0 2px #1a73e826}.char-count{text-align:right;color:var(--text-secondary);margin-top:4px;font-size:12px}.generate-btn{background:var(--primary);color:#fff;cursor:pointer;border:none;border-radius:8px;justify-content:center;align-items:center;gap:8px;width:100%;padding:12px;font-size:15px;font-weight:600;transition:all .2s;display:flex}.generate-btn:hover:not(:disabled){background:var(--primary-hover)}.generate-btn:disabled{opacity:.6;cursor:not-allowed}.generate-btn .spinner{border-width:2px;border-color:#fff #0000 #0000;width:18px;height:18px}.result-card{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px}.result-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;margin-bottom:16px;padding-bottom:12px;display:flex}.result-header h2{color:var(--text);font-size:18px}.result-actions{gap:8px;display:flex}.action-btn{border:1.5px solid var(--border);background:var(--card-bg);color:var(--text);cursor:pointer;border-radius:6px;padding:6px 14px;font-size:13px;transition:all .2s}.action-btn:hover{border-color:var(--primary);color:var(--primary)}.action-btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}.action-btn.primary:hover{background:var(--primary-hover)}.markdown-content{color:var(--text);font-size:15px;line-height:1.8}.markdown-content h1{border-bottom:2px solid var(--primary);text-align:center;margin:20px 0 12px;padding-bottom:8px;font-size:22px}.markdown-content h2{color:#1a1a2e;margin:16px 0 8px;font-size:18px}.markdown-content h3{color:#333;margin:12px 0 6px;font-size:16px}.markdown-content p{margin:8px 0}.markdown-content ul,.markdown-content ol{margin:8px 0;padding-left:24px}.markdown-content li{margin:4px 0}.markdown-content blockquote{border-left:3px solid var(--primary);color:var(--text-secondary);background:#f8f9fb;margin:8px 0;padding:4px 12px;font-style:italic}.markdown-content strong{font-weight:700}.history{flex-direction:column;gap:12px;display:flex}.history-card{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);cursor:pointer;justify-content:space-between;align-items:center;padding:16px 20px;transition:all .2s;display:flex}.history-card:hover{box-shadow:var(--shadow-lg);border-color:var(--primary)}.history-card-left{align-items:center;gap:12px;display:flex}.doc-type-badge{color:var(--primary);white-space:nowrap;background:#e8f0fe;border-radius:12px;padding:3px 10px;font-size:12px;font-weight:600}.history-card .doc-title{color:var(--text);font-size:15px;font-weight:600}.history-card .doc-time{color:var(--text-secondary);white-space:nowrap;font-size:12px}.history-card-actions{gap:8px;display:flex}.delete-btn{border:1px solid var(--border);background:var(--card-bg);color:var(--text-secondary);cursor:pointer;border-radius:6px;padding:4px 10px;font-size:12px;transition:all .2s}.delete-btn:hover{border-color:var(--danger);color:var(--danger)}.empty-state{text-align:center;color:var(--text-secondary);padding:60px 20px}.empty-state .icon{margin-bottom:12px;font-size:48px}.error-message{color:#dc2626;background:#fef2f2;border:1px solid #fecaca;border-radius:8px;padding:12px 16px;font-size:14px}@media (width<=640px){.app-header{padding:0 12px}.app-title{font-size:16px}.app-main,.generator-card,.result-card{padding:16px}.history-card{flex-direction:column;align-items:flex-start;gap:8px}}