*{box-sizing:border-box;margin:0;padding:0}:root{--primary-color:#4caf50;--primary-dark:#388e3c;--primary-light:#c8e6c9;--secondary-color:#2196f3;--danger-color:#f44336;--warning-color:#ff9800;--text-primary:#333;--text-secondary:#666;--bg-primary:#f5f5f5;--bg-white:#fff;--border-color:#e0e0e0;--shadow:0 2px 8px #0000001a;--radius:8px}body{background:var(--bg-primary);color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;line-height:1.6}.app-container{flex-direction:column;min-height:100vh;display:flex}.app-header{background:var(--bg-white);box-shadow:var(--shadow);z-index:100;padding:12px 20px;position:sticky;top:0}.header-content{justify-content:space-between;align-items:center;max-width:1200px;margin:0 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#0003}.login-title{text-align:center;color:var(--primary-color);margin-bottom:8px;font-size:32px;font-weight:700}.login-subtitle{text-align:center;color:var(--text-secondary);margin-bottom:32px}.form-group{margin-bottom:20px}.form-label{color:var(--text-primary);margin-bottom:8px;font-weight:500;display:block}.form-input{border:2px solid var(--border-color);border-radius:var(--radius);width:100%;padding:12px 16px;font-size:16px;transition:border-color .3s}.form-input:focus{border-color:var(--primary-color);outline:none}.btn{border-radius:var(--radius);cursor:pointer;border:none;justify-content:center;align-items:center;gap:8px;padding:12px 24px;font-size:16px;font-weight:500;transition:all 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var(--border-color);cursor:pointer;border-radius:50%;flex-shrink:0;width:20px;height:20px;margin-top:2px}.task-status.completed{background:var(--primary-color);border-color:var(--primary-color)}.task-content{flex:1}.task-title{margin-bottom:4px;font-size:16px;font-weight:500}.task-title.completed{color:var(--text-secondary);text-decoration:line-through}.task-meta{color:var(--text-secondary);flex-wrap:wrap;gap:12px;font-size:14px;display:flex}.task-actions{gap:8px;display:flex}.priority-badge{border-radius:12px;padding:2px 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